CA2113985C - Dry screen and process for making it - Google Patents
Dry screen and process for making it Download PDFInfo
- Publication number
- CA2113985C CA2113985C CA 2113985 CA2113985A CA2113985C CA 2113985 C CA2113985 C CA 2113985C CA 2113985 CA2113985 CA 2113985 CA 2113985 A CA2113985 A CA 2113985A CA 2113985 C CA2113985 C CA 2113985C
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- Prior art keywords
- threads
- longitudinal threads
- group
- dry screen
- longitudinal
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/0027—Screen-cloths
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/0027—Screen-cloths
- D21F1/0036—Multi-layer screen-cloths
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/30—Woven fabric [i.e., woven strand or strip material]
- Y10T442/3065—Including strand which is of specific structural definition
- Y10T442/3089—Cross-sectional configuration of strand material is specified
- Y10T442/3106—Hollow strand material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/30—Woven fabric [i.e., woven strand or strip material]
- Y10T442/3179—Woven fabric is characterized by a particular or differential weave other than fabric in which the strand denier or warp/weft pick count is specified
- Y10T442/322—Warp differs from weft
Abstract
A dry screen (1) reveals longitudinal threads (4, 5, 6, 7, 8, 9) that run in machine movement direction (A) and lateral threads (2) that extend laterally thereto and that consist of synthetic material, with a first group of longitudinal threads (4, 5, 6, 7) floating on the paper side over several lateral threads (2), and a second group of longitudinal threads (8, 9) being present, said group tying up in a manner different from the first group of longitudinal threads (4, 5, 6, 7). To make sure that such a dry screen (1) will have good flexibility in spite of the large contact surface on the paper side, at least two neighboring longitudinal threads (4, 5 or 6, 7), each time, of the first group, form subgroups of longitudinal threads (4, 5, or 6, 7) that run identical binding, at least on the paper side, and the longitudinal threads (4, or 6, 7) of one group rest next to each other, side by side.
Description
211398~~
Description This invention relates to a dry screen with longitudinal threads that extend in the machine movement direction and lateral threads that extend laterally thereto and consist of synthetic material, with one first group of longitudinal threads floating on the paper side over several lateral threads and a second group of longitudinal threads being present and binding in a manner different from that of the first group of longitudinal threads.
Dry screens are fabrics consisting of synthetic threads with longitudinal threads that extend in the machine movement direction and with lateral threads that extend laterally thereto. They are inserted in the dry sector of a paper machine, and there they guide the paper web over the hot dry cylinders. Here the essential thing is that the dry screens provide for a good heat transfer and that condensate formation is prevented. An effort has therefore been made to shape the dry screens as thin as possible and to make large contact surfaces available.
Many fabric designs are known for dry screens.
Reference is made here, merely.by way of example, to PCT
Application WO 91/19044 and to the state of the art described there. This publication discloses paper machine fabrics where a first group of longitudinal threads floats on the paper side over several lateral threads, the longitudinal threads here being made in the form of flat monofilaments. This group of longitudinal ~11398~
threads runs above a second group of longitudinal threads that can also be made in the form of flat monofilaments.
The known dry screen does, of course, have a good contact surface due to the use of very wide flat monofilaments, especially for the longitudinal threads of the first group. But these threads impair the flexibility of the dry screen. Besides, the very wide flat monofilaments are special threads that are not easy to process and that are expensive.
The purpose of the invention, therefore, is to design a dry screen of the kind mentioned initially so that good flexibility will be attained in spite of the large contact surface on the paper side.
According to the invention, this problem is solved in that at least two neighboring longitudinal threads of the first group in each case form subgroups of longitudinal threads that run in an equally binding manner, at least on the paper side, and that the longitudinal threads of one subgroup rest next to each other, side by side. Preferably, the longitudinal threads of one subgroup should also run in an equally binding manner for the rest. The term "equally bindings means the kind of course where the particular longitudinal threads are tied up next to each other identically into the fabric.
According to the invention, in other words, the two contact surfaces are generated with the help of several longitudinal threads that are combined to form subgroups with an identically binding course. For this purpose, one can use standard longitudinal threads that are preferably made in the form of flat monofilaments with a cross-section ratio of 1.2:1 to 3:1. The flexibility of the dry screen is not impaired because the longitudinal threads, in spite of their combination into subgroups and their mutual contact, are movable among each other.
By way of a further feature of the invention, it is provided that, looking at it from the paper side, a longitudinal thread of the second group runs underneath two neighboring longitudinal threads of a subgroup. Here it is particularly preferred that no longitudinal threads of the second group run between two subgroups of longitudinal threads of the first group. When each subgroup consists only of two longitudinal threads, then only one longitudinal thread of the second group goes with two longitudinal threads of the first group. On the one hand, this achieves a concentration of the longitudinal threads on the paper side to attain a big contact surface; on the other hand, the dry screen is comparatively open on the machine side and that makes for a good steam passage.
As a further feature of the invention, it is provided that the longitudinal threads of the second group tie up on the paper side only with those lateral threads over which float the longitudinal threads of a subgroup, said threads running above this longitudinal thread of the second group. In this way, one can avoid a crossover of the longitudinal threads of the first and the second group. Corresponding features are also provided in a practical fashion on the underside or the machine side of the dry screen in that the longitudinal threads of the second group float on the machine side over those lateral threads that tie up on the machine side with the longitudinal threads of one subgroup, said threads running above the particular longitudinal thread of the second group.
The longitudinal threads of the first group should, on the paper side, float at least over three lateral threads before they tie up anew. Floating, however, can also run over up to nine lateral threads. On the machine side, the longitudinal threads of the first group should tie up only with one lateral thread. A corresponding feature is also provided for the longitudinal threads of the second group where one gets a mirror-image course to the longitudinal threads of the first group.
According to yet another feature of the invention, it is provided that the lateral threads are made as open, hallow monofilaments such as they are known, for example, from U.S. Patent No. 4,251,588. Here it is possible to make either all or only a part of the lateral threads in the form of hollow monofilaments. In the latter case, the other part of the lateral threads should then be made as massive monofilaments so that the hollow monofilaments then should alternate with the massive monofilaments, specifically and preferably, always one hollow monofilament with a massive monofilament. To attain a dry screen that would be as thin as possible, the hollow monofilaments can then be made flattened, using a bowl glazing procedure.
Another feature of the invention consists of the fact that lateral threads with a larger diameter alternate with lateral threads that have a comparatively smaller diameter, specifically and preferably, in such a way that one lateral thread with a larger diameter will always alternate with a lateral thread having a smaller diameter.
The longitudinal threads of a subgroup are in a practical fashion staggered with respect to the neighboring longitudinal threads of a subgroup, in the machine movement direction, as far as their tie-up is concerned. Furthermore, the longitudinal threads of the first group should have an identical cross-section shape and surface.
Although the dry screen can also be made in the form of several layers, an effort is to be made to fashion this as a single-layer dry screen to keep the thickness of the dry screen as small as possible.
A dry screen, according to the invention, can be made in a simple manner in that, for the weaving process, one uses shrinkable lateral threads, and the dry screen is heat-treated after the weaving process so that the particular identically binding, longitudinal threads of one subgroup will come to rest against each other, side by side. It is known that synthetic threads, such as, for example, polyester threads or the like, are subject to shrinkage when impacted with heat. The shrinkability here is used in a specifically determined fashion to place the longitudinal threads of one subgroup against each other, and also to place the longitudinal threads of two neighboring subgroups against each other, which makes for a large surface and practically uninterrupted contact surfaces.
Thus, according to a broad aspect, the invention provides a dry screen (1) with longitudinal threads (4, 5, 6, 7, 8, 9) extending in the machine movement direction (A) and with lateral threads (2) extending laterally thereto and made of synthetic material, with a first group of longitudinal threads (4, 5, 6, 7) floating on a paper side over a plurality of adjacent lateral threads (2) and a second group of longitudinal threads (8, 9) that binds differently when compared to the first group of longitudinal threads (4, 5, 6, 7), characterized in that a plurality of subgroups of longitudinal threads are each formed by at least two neighboring first group longitudinal threads (4, 5) (6, 7), that run equally binding on the paper side, the longitudinal threads (4, 5) (6, 7) of each subgroup resting next to each other side by side.
In accordance with another aspect, the invention provides a process for making the above dry screen, characterized in that, for a weaving process, one uses shrinkable lateral threads (2) and that the dry screen (1) is heat-treated after the weaving process so that the longitudinal threads (4, 5) (6, 7) of one subgroup come to rest next to each other, side by side, said longitudinal threads running i.n each case in an identically binding manner.
The drawing illustrates the invention with the help of a practical example in greater detail.
Figure 1 is an excerpt of a dry screen according to the invention in perspective view, on its paper side, after the weaving process and prior to the shrinkage process; and Figure 2 is the excerpt according to Figure 1 after the shrinking process, in the identical view.
Dry screen (1), illustrated in Figure 1, is made as a single-layer fabric and has a machine movement direction that runs along arrow A. Round lateral threads - labeled (2), by way of example - run laterally with respect to that machine movement direction A. These round lateral threads are made in the form of hollow monofilaments, in other words, in the untreated state, they reveal cavities, labeled (3), by way of example. Lateral threads (2) consist of a synthetic material, for example, polyester, that is highly shrinkable when heat is applied.
7a Longitudinal threads tie up with lateral threads (2) in machine movement direction A, and those longitudinal threads are made as flat monofilaments with a rectangular cross-section. A first group of longitudinal threads --labeled (4, 5, 6, 7), by way of example -- in each case floats over three lateral threads on the paper side, before the longitudinal threads (4, 5, 6, 7) tie up with one lateral thread (2), underneath, on the machine side.
Here, two adjacent longitudinal threads (4, 5,) or (6, 7) each time run in an identically binding fashion, in other words, they run identically and always parallel to each other. Two longitudinal threads (4, 5) or (6, 7) at a time thus form subgroups in the first group of longitudinal threads (4, 5, 6, 7), with the subgroups running next to each other, although staggered in machine movement direction A by two lateral threads (2), each time.
Between two longitudinal threads (4, 5) or (6, 7), forming a subgroup, there runs each time an additional longitudinal thread (8, 9), and together they form a second group of longitudinal threads. They run in mirror-image fashion with respect to the longitudinal threads (4, 5) or (6, 7) of the first group, that is to say, in each case they tie up only with one lateral thread (2) on the paper side and they then float on the machine side over three lateral threads (2).
Longitudinal threads (8, 9) of the second group here, on the paper side, tie up only with those lateral threads (2) over which float the longitudinal threads (4, 5) or (6, 7) of the pertinent subgroup. Two longitudinal threads (8, 9) of the second group, that run next to each other, are likewise staggered by two lateral threads (2) in machine movement direction A, as regards to their tie-up.
Figure 1 shows the condition of the dry screen (1) after the weaving process. Longitudinal threads (4, 5) or (6, 7) of a subgroup are then at an interval from each other that is somewhat greater than the width of the longitudinal threads (8, 9) of the second group. The dry screen thus made (1) is subjected to heat treatment at temperatures at which the lateral threads (2) shrink rather considerably. As a result, longitudinal threads (4, 5) or (6, 7) come to rest against each other and, i;n the process, they are shoved along the paper side over the longitudinal threads (8, 9) of the second group and on the machine side between the particular lateral threads (2) and the particular longitudinal threads (8, 9) that float there. The neighboring longitudinal threads (5, 6) of the two subgroups also come to rest against each other then. In this way, one gets the fabric picture according to Figure 2 that is characterized by large contact surfaces on the paper side.
Dry screen (1) is then subjected to a bowl glazing treatment as a result of which the lateral threads (2) are pressed flat so that the insides of the cavities (,3) come to rest against each other, in other words, that there will no longer be any cavities (3). This generates a very thin dry screen (1) with favorable heat transfer properties.
Description This invention relates to a dry screen with longitudinal threads that extend in the machine movement direction and lateral threads that extend laterally thereto and consist of synthetic material, with one first group of longitudinal threads floating on the paper side over several lateral threads and a second group of longitudinal threads being present and binding in a manner different from that of the first group of longitudinal threads.
Dry screens are fabrics consisting of synthetic threads with longitudinal threads that extend in the machine movement direction and with lateral threads that extend laterally thereto. They are inserted in the dry sector of a paper machine, and there they guide the paper web over the hot dry cylinders. Here the essential thing is that the dry screens provide for a good heat transfer and that condensate formation is prevented. An effort has therefore been made to shape the dry screens as thin as possible and to make large contact surfaces available.
Many fabric designs are known for dry screens.
Reference is made here, merely.by way of example, to PCT
Application WO 91/19044 and to the state of the art described there. This publication discloses paper machine fabrics where a first group of longitudinal threads floats on the paper side over several lateral threads, the longitudinal threads here being made in the form of flat monofilaments. This group of longitudinal ~11398~
threads runs above a second group of longitudinal threads that can also be made in the form of flat monofilaments.
The known dry screen does, of course, have a good contact surface due to the use of very wide flat monofilaments, especially for the longitudinal threads of the first group. But these threads impair the flexibility of the dry screen. Besides, the very wide flat monofilaments are special threads that are not easy to process and that are expensive.
The purpose of the invention, therefore, is to design a dry screen of the kind mentioned initially so that good flexibility will be attained in spite of the large contact surface on the paper side.
According to the invention, this problem is solved in that at least two neighboring longitudinal threads of the first group in each case form subgroups of longitudinal threads that run in an equally binding manner, at least on the paper side, and that the longitudinal threads of one subgroup rest next to each other, side by side. Preferably, the longitudinal threads of one subgroup should also run in an equally binding manner for the rest. The term "equally bindings means the kind of course where the particular longitudinal threads are tied up next to each other identically into the fabric.
According to the invention, in other words, the two contact surfaces are generated with the help of several longitudinal threads that are combined to form subgroups with an identically binding course. For this purpose, one can use standard longitudinal threads that are preferably made in the form of flat monofilaments with a cross-section ratio of 1.2:1 to 3:1. The flexibility of the dry screen is not impaired because the longitudinal threads, in spite of their combination into subgroups and their mutual contact, are movable among each other.
By way of a further feature of the invention, it is provided that, looking at it from the paper side, a longitudinal thread of the second group runs underneath two neighboring longitudinal threads of a subgroup. Here it is particularly preferred that no longitudinal threads of the second group run between two subgroups of longitudinal threads of the first group. When each subgroup consists only of two longitudinal threads, then only one longitudinal thread of the second group goes with two longitudinal threads of the first group. On the one hand, this achieves a concentration of the longitudinal threads on the paper side to attain a big contact surface; on the other hand, the dry screen is comparatively open on the machine side and that makes for a good steam passage.
As a further feature of the invention, it is provided that the longitudinal threads of the second group tie up on the paper side only with those lateral threads over which float the longitudinal threads of a subgroup, said threads running above this longitudinal thread of the second group. In this way, one can avoid a crossover of the longitudinal threads of the first and the second group. Corresponding features are also provided in a practical fashion on the underside or the machine side of the dry screen in that the longitudinal threads of the second group float on the machine side over those lateral threads that tie up on the machine side with the longitudinal threads of one subgroup, said threads running above the particular longitudinal thread of the second group.
The longitudinal threads of the first group should, on the paper side, float at least over three lateral threads before they tie up anew. Floating, however, can also run over up to nine lateral threads. On the machine side, the longitudinal threads of the first group should tie up only with one lateral thread. A corresponding feature is also provided for the longitudinal threads of the second group where one gets a mirror-image course to the longitudinal threads of the first group.
According to yet another feature of the invention, it is provided that the lateral threads are made as open, hallow monofilaments such as they are known, for example, from U.S. Patent No. 4,251,588. Here it is possible to make either all or only a part of the lateral threads in the form of hollow monofilaments. In the latter case, the other part of the lateral threads should then be made as massive monofilaments so that the hollow monofilaments then should alternate with the massive monofilaments, specifically and preferably, always one hollow monofilament with a massive monofilament. To attain a dry screen that would be as thin as possible, the hollow monofilaments can then be made flattened, using a bowl glazing procedure.
Another feature of the invention consists of the fact that lateral threads with a larger diameter alternate with lateral threads that have a comparatively smaller diameter, specifically and preferably, in such a way that one lateral thread with a larger diameter will always alternate with a lateral thread having a smaller diameter.
The longitudinal threads of a subgroup are in a practical fashion staggered with respect to the neighboring longitudinal threads of a subgroup, in the machine movement direction, as far as their tie-up is concerned. Furthermore, the longitudinal threads of the first group should have an identical cross-section shape and surface.
Although the dry screen can also be made in the form of several layers, an effort is to be made to fashion this as a single-layer dry screen to keep the thickness of the dry screen as small as possible.
A dry screen, according to the invention, can be made in a simple manner in that, for the weaving process, one uses shrinkable lateral threads, and the dry screen is heat-treated after the weaving process so that the particular identically binding, longitudinal threads of one subgroup will come to rest against each other, side by side. It is known that synthetic threads, such as, for example, polyester threads or the like, are subject to shrinkage when impacted with heat. The shrinkability here is used in a specifically determined fashion to place the longitudinal threads of one subgroup against each other, and also to place the longitudinal threads of two neighboring subgroups against each other, which makes for a large surface and practically uninterrupted contact surfaces.
Thus, according to a broad aspect, the invention provides a dry screen (1) with longitudinal threads (4, 5, 6, 7, 8, 9) extending in the machine movement direction (A) and with lateral threads (2) extending laterally thereto and made of synthetic material, with a first group of longitudinal threads (4, 5, 6, 7) floating on a paper side over a plurality of adjacent lateral threads (2) and a second group of longitudinal threads (8, 9) that binds differently when compared to the first group of longitudinal threads (4, 5, 6, 7), characterized in that a plurality of subgroups of longitudinal threads are each formed by at least two neighboring first group longitudinal threads (4, 5) (6, 7), that run equally binding on the paper side, the longitudinal threads (4, 5) (6, 7) of each subgroup resting next to each other side by side.
In accordance with another aspect, the invention provides a process for making the above dry screen, characterized in that, for a weaving process, one uses shrinkable lateral threads (2) and that the dry screen (1) is heat-treated after the weaving process so that the longitudinal threads (4, 5) (6, 7) of one subgroup come to rest next to each other, side by side, said longitudinal threads running i.n each case in an identically binding manner.
The drawing illustrates the invention with the help of a practical example in greater detail.
Figure 1 is an excerpt of a dry screen according to the invention in perspective view, on its paper side, after the weaving process and prior to the shrinkage process; and Figure 2 is the excerpt according to Figure 1 after the shrinking process, in the identical view.
Dry screen (1), illustrated in Figure 1, is made as a single-layer fabric and has a machine movement direction that runs along arrow A. Round lateral threads - labeled (2), by way of example - run laterally with respect to that machine movement direction A. These round lateral threads are made in the form of hollow monofilaments, in other words, in the untreated state, they reveal cavities, labeled (3), by way of example. Lateral threads (2) consist of a synthetic material, for example, polyester, that is highly shrinkable when heat is applied.
7a Longitudinal threads tie up with lateral threads (2) in machine movement direction A, and those longitudinal threads are made as flat monofilaments with a rectangular cross-section. A first group of longitudinal threads --labeled (4, 5, 6, 7), by way of example -- in each case floats over three lateral threads on the paper side, before the longitudinal threads (4, 5, 6, 7) tie up with one lateral thread (2), underneath, on the machine side.
Here, two adjacent longitudinal threads (4, 5,) or (6, 7) each time run in an identically binding fashion, in other words, they run identically and always parallel to each other. Two longitudinal threads (4, 5) or (6, 7) at a time thus form subgroups in the first group of longitudinal threads (4, 5, 6, 7), with the subgroups running next to each other, although staggered in machine movement direction A by two lateral threads (2), each time.
Between two longitudinal threads (4, 5) or (6, 7), forming a subgroup, there runs each time an additional longitudinal thread (8, 9), and together they form a second group of longitudinal threads. They run in mirror-image fashion with respect to the longitudinal threads (4, 5) or (6, 7) of the first group, that is to say, in each case they tie up only with one lateral thread (2) on the paper side and they then float on the machine side over three lateral threads (2).
Longitudinal threads (8, 9) of the second group here, on the paper side, tie up only with those lateral threads (2) over which float the longitudinal threads (4, 5) or (6, 7) of the pertinent subgroup. Two longitudinal threads (8, 9) of the second group, that run next to each other, are likewise staggered by two lateral threads (2) in machine movement direction A, as regards to their tie-up.
Figure 1 shows the condition of the dry screen (1) after the weaving process. Longitudinal threads (4, 5) or (6, 7) of a subgroup are then at an interval from each other that is somewhat greater than the width of the longitudinal threads (8, 9) of the second group. The dry screen thus made (1) is subjected to heat treatment at temperatures at which the lateral threads (2) shrink rather considerably. As a result, longitudinal threads (4, 5) or (6, 7) come to rest against each other and, i;n the process, they are shoved along the paper side over the longitudinal threads (8, 9) of the second group and on the machine side between the particular lateral threads (2) and the particular longitudinal threads (8, 9) that float there. The neighboring longitudinal threads (5, 6) of the two subgroups also come to rest against each other then. In this way, one gets the fabric picture according to Figure 2 that is characterized by large contact surfaces on the paper side.
Dry screen (1) is then subjected to a bowl glazing treatment as a result of which the lateral threads (2) are pressed flat so that the insides of the cavities (,3) come to rest against each other, in other words, that there will no longer be any cavities (3). This generates a very thin dry screen (1) with favorable heat transfer properties.
Claims (21)
1. Dry screen (1) with longitudinal threads (4, 5, 6, 7, 8, 9) extending in the machine movement direction (A) and with lateral threads (2) extending laterally thereto and made of synthetic material, with a first group of longitudinal threads (4, 5, 6, 7) floating on a paper side over a plurality of adjacent lateral threads (2) and a second group of longitudinal threads (8, 9) that binds differently when compared to the first group of longitudinal threads (4, 5, 6, 7), characterized in that a plurality of subgroups of longitudinal threads are each formed by at least two neighboring first group longitudinal threads (4, 5) (6, 7), that run equally binding on the paper side, the longitudinal threads (4, 5) (6, 7) of each subgroup resting next to each other side by side.
2. Dry screen according to Claim 1, characterized in that the longitudinal threads (4, 5) (6, 7) of one subgroup also run equally binding on a machine side.
3. Dry screen according to Claim 1 or 2, characterized in that, looking at it from the paper side, a longitudinal thread (8, 9) of the second group runs below two neighboring longitudinal threads (4, 5) (6, 7) of each of the subgroups.
4. Dry screen according to any one of Claims 1 to 3, characterized in that the area between adjacent subgroups of longitudinal threads (4, 5) (6, 7) is free of longitudinal threads (8, 9) of the second group.
5. Dry screen according to any one of Claims 1 to 4, characterized in that each of the longitudinal threads (8, 9) of the second group binds on the paper side only with those lateral threads (2) over which float the longitudinal threads (4, 5) (6, 7) of one of said subgroups, said longitudinal threads of one of said subgroups running above this longitudinal thread (8, 9) of the second group.
6. Dry screen according to any one of Claims 1 to 5, characterized in that each of the longitudinal threads (8, 9) of the second group floats on the machine side over those lateral threads (2) that, on the machine side, bind with the longitudinal threads (4, 5) (6, 7) of one of said subgroups, said longitudinal threads of one of said subgroups running above the said longitudinal thread (8, 9) of the second group.
7. Dry screen according to any one of Claims 1 to 6, characterized in that the longitudinal threads (4, 5, 6, 7) of the first group float on the paper side each time over three to nine lateral threads (2).
8. Dry screen according to any one of Claims 1 to 7, characterized in that the longitudinal threads (4, 5, 6, 7) of the first group on the machine side in each case bind only with one lateral thread (2).
9. Dry screen according to any one of Claims 1 to 8, characterized in that the longitudinal threads (8, 9) of the second group float on the machine side over three to nine lateral threads (2).
10. Dry screen according to any one of Claims 1 to 9, characterized in that the longitudinal threads (8, 9) of the second group, on the paper side, tie up only in each case with one lateral thread (2).
11. Dry screen according to any one of Claims 1 to 10, characterized in that the longitudinal threads (4, 5, 6, 7)
12 of the first group tie up in mirror-image fashion in relation to the longitudinal threads (8, 9) of the second group.
12. Dry screen according to any one of Claims 1 to 11, characterized in that the lateral threads (2) are made as open, hollow monofilaments.
12. Dry screen according to any one of Claims 1 to 11, characterized in that the lateral threads (2) are made as open, hollow monofilaments.
13. Dry screen according to any one of Claims 1 to 11, characterized in that the lateral threads alternate between those that are made as open, hollow monofilaments, and those that are made as massive monofilaments.
14. Dry screen according to Claim 12 or 13, characterized in that those lateral threads (2) that are, made as hollow monofilaments, are flattened out.
15. Dry screen according to any one of Claims 1 to 14, characterized in that the lateral threads alternate between those having a larger diameter and those that have a smaller diameter by comparison.
16. Dry screen according to any one of Claims 1 to 15, characterized in that at least the longitudinal threads (4, 5, 6, 7) of the first group are made as flat monofilaments whose extent in a plane defined by the dry screen is greater than perpendicularly thereto.
17. Dry screen according to Claim 16, characterized in that the longitudinal threads (4, 5, 6, 7) have a cross-section ratio of 1.2:1 to 3:1.
18. Dry screen according to any one of Claims 1 to 17, characterized in that the longitudinal threads of one subgroup, with respect to longitudinal threads of a neighboring subgroup, are staggered in the machine movement direction as regards to their tie-up.
19. Dry screen according to any one of Claims 1 to 18, characterized in that longitudinal threads (4, 5, 6, 7) of the first group have identical cross-section shapes and surfaces.
20. Dry screen according to any one of Claims 1 to 19, characterized in that the dry screen is made in the form of one layer.
21. Process for making a dry screen according to any one of Claims 1 to 20, characterized in that, for a weaving process, one uses shrinkable lateral threads (2) and that the dry screen (1) is heat-treated after the weaving process so that the longitudinal threads (4, 5) (6, 7) of one subgroup come to rest next to each other, side by side, said longitudinal threads running in each case in an identically binding manner.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4302031.3 | 1993-01-26 | ||
| DE4302031A DE4302031C1 (en) | 1993-01-26 | 1993-01-26 | Fourdrinier for paper mfg. machine for large contact surface area - comprises oven plastics filaments with gp. in sub-gps. shrunk for longitudinal filaments side by side, for flexibility |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2113985A1 CA2113985A1 (en) | 1994-07-27 |
| CA2113985C true CA2113985C (en) | 2005-07-26 |
Family
ID=6478927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2113985 Expired - Fee Related CA2113985C (en) | 1993-01-26 | 1994-01-21 | Dry screen and process for making it |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5465764A (en) |
| EP (1) | EP0609664B1 (en) |
| AT (1) | ATE164648T1 (en) |
| CA (1) | CA2113985C (en) |
| DE (2) | DE4302031C1 (en) |
| FI (1) | FI96885C (en) |
| NO (1) | NO940262L (en) |
Families Citing this family (49)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5799708A (en) * | 1996-10-11 | 1998-09-01 | Albany International Corp. | Papermaker's fabric having paired identical machine-direction yarns weaving as one |
| US5713398A (en) | 1996-12-02 | 1998-02-03 | Albany International Corp. | Papermaker's fabric having paired different machine-direction yarns weaving as one |
| GB9807704D0 (en) * | 1998-04-09 | 1998-06-10 | Scapa Group Plc | Fabric and seam construction |
| US5996378A (en) * | 1998-05-20 | 1999-12-07 | Guilford Mills, Inc. | Knitted textile fabric with integrated fluid-containing or -conveying tubular segments |
| DE19923088C1 (en) | 1999-05-20 | 2000-10-12 | Heimbach Gmbh Thomas Josef | Woven blanket for drying section of papermaking machine has paired longitudinal filaments pulled out into long and short loops at end sides for smooth surface on paper side when locked together by inserted wire |
| US6585006B1 (en) | 2000-02-10 | 2003-07-01 | Weavexx Corporation | Papermaker's forming fabric with companion yarns |
| FI107550B (en) | 2000-05-18 | 2001-08-31 | Tamfelt Oyj Abp | Drier wire |
| US6244306B1 (en) * | 2000-05-26 | 2001-06-12 | Weavexx Corporation | Papermaker's forming fabric |
| US6253796B1 (en) | 2000-07-28 | 2001-07-03 | Weavexx Corporation | Papermaker's forming fabric |
| US6745797B2 (en) | 2001-06-21 | 2004-06-08 | Weavexx Corporation | Papermaker's forming fabric |
| CN100357508C (en) * | 2001-07-05 | 2007-12-26 | 阿斯坦约翰逊公司 | Industrial fabric including yarn assemblies |
| US20080260744A1 (en) * | 2002-09-09 | 2008-10-23 | Omeros Corporation | G protein coupled receptors and uses thereof |
| US7048012B2 (en) * | 2002-10-24 | 2006-05-23 | Albany International Corp. | Paired warp triple layer forming fabrics with optimum sheet building characteristics |
| US6834684B2 (en) * | 2002-10-24 | 2004-12-28 | Albany International Corp. | Paired warp triple layer forming fabrics with optimum sheet building characteristics |
| US6837277B2 (en) | 2003-01-30 | 2005-01-04 | Weavexx Corporation | Papermaker's forming fabric |
| US6860969B2 (en) | 2003-01-30 | 2005-03-01 | Weavexx Corporation | Papermaker's forming fabric |
| US6896009B2 (en) | 2003-03-19 | 2005-05-24 | Weavexx Corporation | Machine direction yarn stitched triple layer papermaker's forming fabrics |
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| US7243687B2 (en) | 2004-06-07 | 2007-07-17 | Weavexx Corporation | Papermaker's forming fabric with twice as many bottom MD yarns as top MD yarns |
| DE102004035523A1 (en) * | 2004-07-22 | 2006-02-09 | Voith Fabrics Patent Gmbh | Paper machine clothing |
| DE102004035519A1 (en) * | 2004-07-22 | 2006-02-09 | Voith Fabrics Patent Gmbh | Paper machine clothing |
| DE102004035522A1 (en) * | 2004-07-22 | 2006-03-16 | Voith Fabrics Patent Gmbh | Paper machine clothing |
| US7523626B2 (en) * | 2004-10-01 | 2009-04-28 | Saint-Gobain Performance Plastics Corporation | Conveyor belt |
| US7195040B2 (en) | 2005-02-18 | 2007-03-27 | Weavexx Corporation | Papermaker's forming fabric with machine direction stitching yarns that form machine side knuckles |
| DE102005029573A1 (en) * | 2005-06-25 | 2007-01-04 | Voith Patent Gmbh | Papermaking fabric |
| US7484538B2 (en) | 2005-09-22 | 2009-02-03 | Weavexx Corporation | Papermaker's triple layer forming fabric with non-uniform top CMD floats |
| US7219701B2 (en) | 2005-09-27 | 2007-05-22 | Weavexx Corporation | Papermaker's forming fabric with machine direction stitching yarns that form machine side knuckles |
| DE102005055785A1 (en) * | 2005-11-21 | 2007-05-24 | Voith Patent Gmbh | papermaker |
| DE102005060301A1 (en) * | 2005-12-16 | 2007-06-21 | Voith Patent Gmbh | Paper machine clothing |
| DE102005060299A1 (en) * | 2005-12-16 | 2007-06-21 | Voith Patent Gmbh | papermaker |
| US7360560B2 (en) * | 2006-01-31 | 2008-04-22 | Astenjohnson, Inc. | Single layer papermakers fabric |
| US7275566B2 (en) | 2006-02-27 | 2007-10-02 | Weavexx Corporation | Warped stitched papermaker's forming fabric with fewer effective top MD yarns than bottom MD yarns |
| US7580229B2 (en) | 2006-04-27 | 2009-08-25 | Hitachi Global Storage Technologies Netherlands B.V. | Current-perpendicular-to-the-plane (CPP) magnetoresistive sensor with antiparallel-free layer structure and low current-induced noise |
| US7617846B2 (en) * | 2006-07-25 | 2009-11-17 | Albany International Corp. | Industrial fabric, and method of making thereof |
| DE102006061114A1 (en) * | 2006-12-22 | 2008-06-26 | Voith Patent Gmbh | Fabric tape for a machine for producing web material and method for producing such a fabric tape |
| US7487805B2 (en) | 2007-01-31 | 2009-02-10 | Weavexx Corporation | Papermaker's forming fabric with cross-direction yarn stitching and ratio of top machined direction yarns to bottom machine direction yarns of less than 1 |
| US7624766B2 (en) * | 2007-03-16 | 2009-12-01 | Weavexx Corporation | Warped stitched papermaker's forming fabric |
| US20090183795A1 (en) | 2008-01-23 | 2009-07-23 | Kevin John Ward | Multi-Layer Papermaker's Forming Fabric With Long Machine Side MD Floats |
| US7766053B2 (en) | 2008-10-31 | 2010-08-03 | Weavexx Corporation | Multi-layer papermaker's forming fabric with alternating paired and single top CMD yarns |
| US8251103B2 (en) | 2009-11-04 | 2012-08-28 | Weavexx Corporation | Papermaker's forming fabric with engineered drainage channels |
| CA2748789A1 (en) * | 2011-08-15 | 2013-02-15 | Derek Chaplin | Embossing fabric including warp yarn sets |
| US8808506B2 (en) * | 2012-02-13 | 2014-08-19 | Voith Patent Gmbh | Structured fabric for use in a papermaking machine and the fibrous web produced thereon |
| EP2631360B1 (en) * | 2012-02-24 | 2014-05-14 | Heimbach GmbH & Co. KG | Fabric for forming a paper web having an embossed surface |
| CA2773501A1 (en) * | 2012-04-02 | 2013-10-02 | Derek Chaplin | Single layer through-air dryer fabrics |
| WO2014016364A1 (en) * | 2012-07-27 | 2014-01-30 | Voith Patent Gmbh | Dryer fabric |
| CN104818642B (en) * | 2015-05-22 | 2016-08-17 | 安平县鑫鹏网带有限公司 | A kind of technical fabric |
| DE102016200230A1 (en) * | 2016-01-12 | 2017-08-17 | Voith Patent Gmbh | dryer |
| CN110709547A (en) * | 2017-05-30 | 2020-01-17 | 艾斯登强生股份有限公司 | Stack warp dry fabric with long floating warps and high stability |
| DE102017007127A1 (en) * | 2017-07-31 | 2019-01-31 | Gkd - Gebr. Kufferath Ag | Filter fabric and use of a filter fabric |
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| BE530871A (en) * | ||||
| DE454092C (en) * | 1927-12-29 | H G Waldhelm Filztuchfabrik | Woven dewatering felt for paper machines | |
| DE680111C (en) * | 1934-06-22 | 1939-08-22 | Eastwood Nealley Corp | Screen, especially for paper machines |
| US2088447A (en) * | 1936-03-23 | 1937-07-27 | Encor Corp | Woven wire belt for paper making machines |
| US2168928A (en) * | 1937-07-13 | 1939-08-08 | Lawrence Duck Company | Single ply asbestos faced drier felt |
| US2180054A (en) * | 1937-08-23 | 1939-11-14 | Hindle Thomas | Paper maker's drier felt |
| US2172430A (en) * | 1937-10-14 | 1939-09-12 | Lawrence Duck Company | Single ply drier felt with asbestos facing |
| US2269869A (en) * | 1940-07-31 | 1942-01-13 | Eastwood Nealley Corp | Woven wire belt for papermaking machines |
| DE1267960B (en) * | 1960-05-18 | 1968-05-09 | Appleton Wire Works Corp | Paper machine screen |
| US3167281A (en) * | 1962-06-13 | 1965-01-26 | Cheney Bigelow Wire Works Inc | Fourdrinier wire cloth |
| DE2847327C2 (en) * | 1978-05-17 | 1984-02-23 | JWI Ltd., Montreal, Quebec | Drying fabrics for paper machines |
| DE2907488C2 (en) * | 1979-02-26 | 1982-07-01 | Dürener Metalltuch Schoeller, Hoesch & Co, 5160 Düren | Paper machine fourdrinier |
| US4344464A (en) * | 1980-07-11 | 1982-08-17 | Huyck Corporation | Endless forming fabrics with bi-crimp characteristics |
| DE3146385C2 (en) * | 1981-11-23 | 1985-10-31 | Hermann Wangner Gmbh & Co Kg, 7410 Reutlingen | Double-layer fabric as a covering for paper machines |
| SE435739B (en) * | 1983-02-23 | 1984-10-15 | Nordiskafilt Ab | DOUBLE TEXTILE TYPE FORMATION WIRES |
| DE3329740C2 (en) * | 1983-08-17 | 1986-07-03 | Hermann Wangner Gmbh & Co Kg, 7410 Reutlingen | Two- or multi-layer fabric as a covering for the sheet forming part of a paper machine |
| US4636426A (en) * | 1985-01-04 | 1987-01-13 | Huyck Corporation | Papermaker's fabric with yarns having multiple parallel monofilament strands |
| US4654052A (en) * | 1985-06-24 | 1987-03-31 | Daryl Sharp | Variable molecular separator |
| US4789009A (en) * | 1986-01-08 | 1988-12-06 | Huyck Corporation | Sixteen harness dual layer weave |
| CA1277209C (en) * | 1986-11-28 | 1990-12-04 | Dale B. Johnson | Composite forming fabric |
| DE3801051A1 (en) * | 1988-01-15 | 1989-07-27 | Wangner Gmbh Co Kg Hermann | DOUBLE-DAY LOADING FOR THE SHEETING AREA OF A PAPER MACHINE |
| DE3923938A1 (en) * | 1989-07-19 | 1991-01-31 | Oberdorfer Fa F | FORMING FABRICS FOR THE WET SECTION OF A PAPER MACHINE |
| US4949993A (en) * | 1989-07-31 | 1990-08-21 | Laguna Tectrix, Inc. | Exercise apparatus having high durability mechanism for user energy transmission |
| US5025839A (en) * | 1990-03-29 | 1991-06-25 | Asten Group, Inc. | Two-ply papermakers forming fabric with zig-zagging MD yarns |
| US5092373A (en) * | 1990-06-06 | 1992-03-03 | Asten Group, Inc. | Papermakers fabric with orthogonal machine direction yarn seaming loops |
| ES2063504T3 (en) * | 1990-06-06 | 1995-01-01 | Asten Group | FABRICS FOR PAPER MANUFACTURING SYSTEMS WITH FLAT THREADS IN THE DIRECTION OF THE MACHINE. |
| US5117865A (en) * | 1990-06-06 | 1992-06-02 | Asten Group, Inc. | Papermakers fabric with flat high aspect ratio yarns |
| US5116478A (en) * | 1990-11-05 | 1992-05-26 | Nippon Filcon Co., Ltd. | Extendable and heat shrinkable polyester mono-filament for endless fabric |
-
1993
- 1993-01-26 DE DE4302031A patent/DE4302031C1/en not_active Revoked
-
1994
- 1994-01-12 DE DE59405551T patent/DE59405551D1/en not_active Expired - Lifetime
- 1994-01-12 EP EP19940100333 patent/EP0609664B1/en not_active Expired - Lifetime
- 1994-01-12 AT AT94100333T patent/ATE164648T1/en active
- 1994-01-21 CA CA 2113985 patent/CA2113985C/en not_active Expired - Fee Related
- 1994-01-25 NO NO940262A patent/NO940262L/en unknown
- 1994-01-25 US US08/188,330 patent/US5465764A/en not_active Expired - Lifetime
- 1994-01-26 FI FI940377A patent/FI96885C/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| FI96885B (en) | 1996-05-31 |
| DE59405551D1 (en) | 1998-05-07 |
| ATE164648T1 (en) | 1998-04-15 |
| EP0609664A1 (en) | 1994-08-10 |
| NO940262L (en) | 1994-07-27 |
| US5465764A (en) | 1995-11-14 |
| FI96885C (en) | 1996-09-10 |
| FI940377A (en) | 1994-07-27 |
| NO940262D0 (en) | 1994-01-25 |
| DE4302031C1 (en) | 1993-12-16 |
| FI940377A0 (en) | 1994-01-26 |
| CA2113985A1 (en) | 1994-07-27 |
| EP0609664B1 (en) | 1998-04-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20130121 |