US20100136152A1 - Guide element for a tubular film - Google Patents
Guide element for a tubular film Download PDFInfo
- Publication number
- US20100136152A1 US20100136152A1 US12/452,318 US45231808A US2010136152A1 US 20100136152 A1 US20100136152 A1 US 20100136152A1 US 45231808 A US45231808 A US 45231808A US 2010136152 A1 US2010136152 A1 US 2010136152A1
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- United States
- Prior art keywords
- tubular film
- recited
- support legs
- guide
- adjustable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/02—Bending or folding
- B29C53/10—Bending or folding of blown tubular films, e.g. gusseting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0012—Combinations of extrusion moulding with other shaping operations combined with shaping by internal pressure generated in the material, e.g. foaming
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0019—Combinations of extrusion moulding with other shaping operations combined with shaping by flattening, folding or bending
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
Definitions
- This invention relates to a guide element for a tubular film manufactured by the blown film extrusion process, having a support structure with guides that are fastened to the support structure and that act on the circumference of the tubular film.
- thermoplastic plastic manufactured by at least one extruder is extruded from an annular exit opening of a die and blown into a tube, which is then folded by a so-called flattening device into a double-layered film web, conveyed between squeezing rollers, and then supplied to a winding device.
- the flattening device is of two flattening elements, which are arranged in diametrically opposite regions of the tubular film and are adjustable at an acute angle in relation to each other, similar to an inverted V or an A, and whose distance from each other, when viewed in the exit direction of the tubular film, continuously decreases.
- the flattening elements have a number of guides such as strips, rollers, or brushes, which act on the circumference of the tubular film so that the tubular film, which is initially cylindrical, is gradually flattened, passing through an oval shape with continuously changing diameters, into the form of a double-layered film that is folded at its longitudinal edges.
- the tubular film in the region of the larger diameter of the oval cross section at which the folded longitudinal edges of the tubular film finally forms, is largely left alone during the flattening because it is not in contact with the guides and is not guided by the flattening elements of the flattening device. This can lead to problems with regard to product stability, freedom from wrinkles, and the like.
- U.S. Pat. No. 4,170,624 discloses transforming an initially cylindrical tubular film into a rectangular cross section in a special flattening device and then flattening it into a double layer. The intent of this is to avoid mechanical stress on the tubular film during the flattening and resulting changes in the properties profile of the tubular film.
- this invention proposes guide elements whose support structure has a plurality of support legs, which are connected to one another in articulating fashion and are secured so that they can be adjusted in relation to one another by adjusting drive units, and at least one guide means for the tubular film is fastened to each support leg.
- These guide elements can be used both as flattening elements and as lateral guide elements.
- the guide elements according to this invention can be adjusted in various ways and can be individually adapted to the circumferential curvature of the tubular film passing through the flattening device.
- the guide elements according to this invention can be used as lateral guide elements in a lateral guide device having two lateral guide elements, which are arranged in diametrically opposite regions of the tubular film, between the flattening elements, and each has a guide element according to this invention.
- a flattening device has two flattening elements, which are arranged in diametrically opposite regions of the tubular film and are adjustable at an acute angle in relation to each other, for transforming the initially circular cross section of the tubular film, passing through oval cross sections, into a double-layered film web, and has lateral guide elements, which are situated between the flattening elements, are associated with the tubular film, and are for the regions of the tubular film untouched by the flattening elements.
- each support leg of the guide element according to this invention has a separate adjusting drive unit in order to achieve the most flexible possible adjustment options.
- the guide means can be fastened to the support legs in a rigid or an articulating manner by at least one support arm.
- the guide means can be rollers or drums of a suitable plastic such as CFK, silicone, or also aluminum. It is also possible to provide roller brushes or to provide plates from which a current of air emerges in order to produce an air cushion between the plate and the tubular film to ensure a contact-free guidance.
- the plates Preferably, the plates have a microporous surface in order to produce a homogeneous air cushion.
- microporous is understood here to refer to an average pore diameter of 5 to 100 ⁇ m. In the case of rotating rollers or drums, it is preferable to ensure a particularly smooth running.
- the support structure of the guide element according to this invention is of a plurality of support legs, which are connected to one another in articulating fashion and can be individually adjusted by suitable adjusting drive units in accordance with the desired path of the tubular film as it passes through the flattening device.
- one or more support arms for holding the guide means can be fastened to each support leg.
- At least one support arm is provided for each support leg.
- adjusting possibilities can be provided by securing the guide means to the support arms, in a manner that allows them to pivot around a pivot axis extending in the exit direction of the tubular film.
- the adjustment of the support legs which are connected to one another in an articulating fashion and extend from one another in a segmented fashion, because of the separate adjusting drive units provided for the support legs, can be embodied in various ways with respect to the angle enclosed between adjacent support legs in order to adapt to the changing cross section of the tubular film.
- the individual support legs it is possible for the individual support legs to be longitudinally adjustable, for example by a suitable telescoping mechanism, which offers additional degrees of freedom for adapting to the desired contour of the tubular film to be flattened.
- an adjustment transverse to the longitudinal span of the support legs can permit an adaptation to different diameters of the tubular film.
- Embodying the guide element according to this invention with a large number of support legs, such as at least three support legs, also makes it possible to emulate arc-shaped desired contours of the tubular film with a high degree of approximation, particularly if the support arms fastened to the individual support legs and the holding forks, which are for the guide means and are fastened to these arms, are adjustable, for example vertically adjustable, laterally adjustable, and angularly adjustable.
- each guide element at the upper end region of the support structure, can have a guide blade, and when the guide element according to this invention is used in a lateral guide device, comes to rest close to the squeezing rollers of the extrusion device and encloses the outside of the longitudinal edge that forms during the flattening of the tubular film, and guides the forming edge fold until it travels into the roller nip between the squeezing rollers, and thus ensures an exact embodiment of the edge fold of the flattened tubular film.
- This guide blade can also be produced from suitable plastics or also aluminum, for example, if it comes into contact with the tubular film or can also be equipped with a porous, preferably microporous, surface oriented toward the tubular film to permit a supplied current of air to emerge and to produce an air cushion for a contact-free guidance of the tubular film.
- a microporous surface is understood to be a surface with an average pore size of 5 to 100 ⁇ m.
- the distance of the guide blades to the subsequent squeezing rollers should be selected to be small and is preferably adjustable, thus preferably permitting a definite guidance of the longitudinal edge of the tubular film all the way into the roller nip of the squeezing rollers.
- the adjustment of the individual support legs can, for example, be executed with a high degree of positioning precision by spindle drive units or other suitable drive units. It is also preferable for each support leg to have a separate adjusting drive unit.
- the adjusting drive units can also be centrally connected to one another.
- FIG. 1 is a schematic side view of a guide element according to one embodiment of this invention.
- FIG. 2 shows a cross-sectional shape of a tubular film that changes as the tubular film is flattened
- FIG. 3 is a view of a part of a guide element embodied according to this invention.
- FIG. 1 is a schematic view of a tubular film 1 , which is manufactured in a known manner, guided vertically upward in an exit direction A out of an extrusion device, and gradually folded into a flat tubular film by flattening elements, not shown in detail, of a flattening device.
- the drawing also shows a lateral guide device that is part of the flattening device and is equipped with a lateral guide element 2 , which is also provided on the opposite side, symmetrical to the central longitudinal axis of the tubular film 1 .
- the tubular film 1 is gradually transformed, passing through oval cross sections that are labeled Q 2 and Q 3 , by way of example, into a flattened double-layered film web with a cross section Q 4 and edge folds 10 .
- the lateral guide elements 2 guide the tubular film 1 continuously in the region 400 of the larger diameter, such as between the flattening elements labeled with the reference numeral 300 .
- Each lateral guide element 2 comprises, according to FIG. 1 , a support structure with three support legs labeled with the reference numerals 20 , 21 , 22 , which are connected to one another, such as in a chain, by articulating joints 23 , 24 .
- Each of the support legs 20 , 21 , 22 supports support arms 25 to which are secured guides or guide means 27 for the tubular film 1 , which are oriented toward the tubular film 1 , are embodied in the form of CFK rollers, for example, and contact the surface of the tubular film 1 , guiding it precisely in the desired contour.
- each support arm 25 can have pairs of guide means 27 that are supported, if necessary, in an articulating fashion by a pivot axis S extending in the entry direction of the tubular film 1 in order to adapt optimally to the circumference of the tubular film 1 .
- the upper support segment 20 viewed in the exit direction A, has a guide blade 27 a that grasps the outside of the edge fold 10 , which forms during the flattening of the tubular film 1 , and ensures a precise guidance of it all the way to the nip between the squeezing rollers 5 , which are positioned or situated congruently one behind the other in FIG. 1 .
- independent drive units such as spindle drive units 28 are provided, which in the exemplary embodiment shown, engage the support leg 20 and the support leg 22 while the support leg 21 positioned between them has a cantilever 29 that is engaged by the drive unit 28 .
- the drawing also shows an additional engaging arm of a drive unit 28 a, which directly engages the cantilever 29 .
- the support legs 20 , 21 , 22 can be adjusted independently of each other in the direction of the diameter D of the tubular film and can also each telescope in the arrow direction T, for example are embodied as longitudinally adjustable, so that their axial length can be adapted or changed.
- each support leg has at least one support arm 25 for a guide means.
- the guide elements according to this invention can be used not only as a lateral guide element 2 , but also as a flattening element of the flattening device.
Abstract
A guide element for a tubular film which is produced by blown film extrusion. The guide element includes a support structure having guides secured to the support structure and acting upon the circumference of the tubular film. The support structure includes a plurality of support limbs that are articulated to each other and that are received so as to be adjustable relative to each other by adjusting drives. At least one guide for the tubular film is secured to each support limb.
Description
- 1. Field of the Invention
- This invention relates to a guide element for a tubular film manufactured by the blown film extrusion process, having a support structure with guides that are fastened to the support structure and that act on the circumference of the tubular film.
- 2. Discussion of Related Art
- In the manufacture of plastic films by the so-called blown film extrusion process, the melted mass of thermoplastic plastic manufactured by at least one extruder is extruded from an annular exit opening of a die and blown into a tube, which is then folded by a so-called flattening device into a double-layered film web, conveyed between squeezing rollers, and then supplied to a winding device.
- In the simplest case, the flattening device is of two flattening elements, which are arranged in diametrically opposite regions of the tubular film and are adjustable at an acute angle in relation to each other, similar to an inverted V or an A, and whose distance from each other, when viewed in the exit direction of the tubular film, continuously decreases. The flattening elements have a number of guides such as strips, rollers, or brushes, which act on the circumference of the tubular film so that the tubular film, which is initially cylindrical, is gradually flattened, passing through an oval shape with continuously changing diameters, into the form of a double-layered film that is folded at its longitudinal edges.
- If the oval cross-sectional shape of the gradually flattened tubular film, which shape takes form starting from the initially cylindrical tubular film, is viewed in the flattening device, then the tubular film, in the region of the larger diameter of the oval cross section at which the folded longitudinal edges of the tubular film finally forms, is largely left alone during the flattening because it is not in contact with the guides and is not guided by the flattening elements of the flattening device. This can lead to problems with regard to product stability, freedom from wrinkles, and the like.
- U.S. Pat. No. 4,170,624 discloses transforming an initially cylindrical tubular film into a rectangular cross section in a special flattening device and then flattening it into a double layer. The intent of this is to avoid mechanical stress on the tubular film during the flattening and resulting changes in the properties profile of the tubular film.
- It is thus desirable to also provide a definite lateral guidance of the tubular film, such as in the regions not guided by the flattening elements. Because of the straight arrangement of the brushes, rollers, or strips used as guides for the tubular film, though, which has up to now been the default arrangement in the prior art, it is only possible to provide an insufficient point-by-point contact. Particularly in reversing movements of the flattening device and/or a withdrawal device for the tubular film, which is situated after the squeezing rollers, the film starts to form slight wrinkles that run all the way through the completed roll and reduce the quality. This situation is clearly in need of improvement.
- In order to solve this problem, this invention proposes guide elements whose support structure has a plurality of support legs, which are connected to one another in articulating fashion and are secured so that they can be adjusted in relation to one another by adjusting drive units, and at least one guide means for the tubular film is fastened to each support leg.
- These guide elements can be used both as flattening elements and as lateral guide elements.
- The guide elements according to this invention can be adjusted in various ways and can be individually adapted to the circumferential curvature of the tubular film passing through the flattening device.
- In particular, the guide elements according to this invention can be used as lateral guide elements in a lateral guide device having two lateral guide elements, which are arranged in diametrically opposite regions of the tubular film, between the flattening elements, and each has a guide element according to this invention.
- A flattening device according to this invention has two flattening elements, which are arranged in diametrically opposite regions of the tubular film and are adjustable at an acute angle in relation to each other, for transforming the initially circular cross section of the tubular film, passing through oval cross sections, into a double-layered film web, and has lateral guide elements, which are situated between the flattening elements, are associated with the tubular film, and are for the regions of the tubular film untouched by the flattening elements.
- According to one embodiment of this invention, each support leg of the guide element according to this invention has a separate adjusting drive unit in order to achieve the most flexible possible adjustment options.
- The guide means can be fastened to the support legs in a rigid or an articulating manner by at least one support arm.
- The guide means can be rollers or drums of a suitable plastic such as CFK, silicone, or also aluminum. It is also possible to provide roller brushes or to provide plates from which a current of air emerges in order to produce an air cushion between the plate and the tubular film to ensure a contact-free guidance. Preferably, the plates have a microporous surface in order to produce a homogeneous air cushion. The term “microporous” is understood here to refer to an average pore diameter of 5 to 100 μm. In the case of rotating rollers or drums, it is preferable to ensure a particularly smooth running.
- The support structure of the guide element according to this invention is of a plurality of support legs, which are connected to one another in articulating fashion and can be individually adjusted by suitable adjusting drive units in accordance with the desired path of the tubular film as it passes through the flattening device. In this case, one or more support arms for holding the guide means can be fastened to each support leg. At least one support arm is provided for each support leg.
- Other adjusting possibilities can be provided by securing the guide means to the support arms, in a manner that allows them to pivot around a pivot axis extending in the exit direction of the tubular film.
- The adjustment of the support legs, which are connected to one another in an articulating fashion and extend from one another in a segmented fashion, because of the separate adjusting drive units provided for the support legs, can be embodied in various ways with respect to the angle enclosed between adjacent support legs in order to adapt to the changing cross section of the tubular film. According to another embodiment of this invention, it is possible for the individual support legs to be longitudinally adjustable, for example by a suitable telescoping mechanism, which offers additional degrees of freedom for adapting to the desired contour of the tubular film to be flattened. Also, an adjustment transverse to the longitudinal span of the support legs can permit an adaptation to different diameters of the tubular film.
- Embodying the guide element according to this invention with a large number of support legs, such as at least three support legs, also makes it possible to emulate arc-shaped desired contours of the tubular film with a high degree of approximation, particularly if the support arms fastened to the individual support legs and the holding forks, which are for the guide means and are fastened to these arms, are adjustable, for example vertically adjustable, laterally adjustable, and angularly adjustable.
- According to another embodiment of this invention, each guide element, at the upper end region of the support structure, can have a guide blade, and when the guide element according to this invention is used in a lateral guide device, comes to rest close to the squeezing rollers of the extrusion device and encloses the outside of the longitudinal edge that forms during the flattening of the tubular film, and guides the forming edge fold until it travels into the roller nip between the squeezing rollers, and thus ensures an exact embodiment of the edge fold of the flattened tubular film. This guide blade can also be produced from suitable plastics or also aluminum, for example, if it comes into contact with the tubular film or can also be equipped with a porous, preferably microporous, surface oriented toward the tubular film to permit a supplied current of air to emerge and to produce an air cushion for a contact-free guidance of the tubular film.
- Also in this connection, a microporous surface is understood to be a surface with an average pore size of 5 to 100 μm.
- The distance of the guide blades to the subsequent squeezing rollers should be selected to be small and is preferably adjustable, thus preferably permitting a definite guidance of the longitudinal edge of the tubular film all the way into the roller nip of the squeezing rollers.
- The adjustment of the individual support legs can, for example, be executed with a high degree of positioning precision by spindle drive units or other suitable drive units. It is also preferable for each support leg to have a separate adjusting drive unit. The adjusting drive units can also be centrally connected to one another.
- Other embodiments and details of this invention are explained in view of an exemplary embodiment shown in the drawings, wherein:
-
FIG. 1 is a schematic side view of a guide element according to one embodiment of this invention; -
FIG. 2 shows a cross-sectional shape of a tubular film that changes as the tubular film is flattened; and -
FIG. 3 is a view of a part of a guide element embodied according to this invention. -
FIG. 1 is a schematic view of atubular film 1, which is manufactured in a known manner, guided vertically upward in an exit direction A out of an extrusion device, and gradually folded into a flat tubular film by flattening elements, not shown in detail, of a flattening device. The drawing also shows a lateral guide device that is part of the flattening device and is equipped with alateral guide element 2, which is also provided on the opposite side, symmetrical to the central longitudinal axis of thetubular film 1. - Through the action of the flattening elements, which according to the depiction in
FIG. 2 , engage a region labeled with thereference numeral 300 of the initially cylindricaltubular film 1, such as with a circular cross section Q1, thetubular film 1 is gradually transformed, passing through oval cross sections that are labeled Q2 and Q3, by way of example, into a flattened double-layered film web with a cross section Q4 andedge folds 10. - During this flattening process from the cross section Q1 to the cross section Q4, the
lateral guide elements 2 guide thetubular film 1 continuously in theregion 400 of the larger diameter, such as between the flattening elements labeled with thereference numeral 300. - Each
lateral guide element 2 comprises, according toFIG. 1 , a support structure with three support legs labeled with thereference numerals joints - Each of the
support legs support arms 25 to which are secured guides or guide means 27 for thetubular film 1, which are oriented toward thetubular film 1, are embodied in the form of CFK rollers, for example, and contact the surface of thetubular film 1, guiding it precisely in the desired contour. - As shown in
FIG. 3 , the free end of eachsupport arm 25 can have pairs of guide means 27 that are supported, if necessary, in an articulating fashion by a pivot axis S extending in the entry direction of thetubular film 1 in order to adapt optimally to the circumference of thetubular film 1. - In lieu of guide means in the form of rollers, the
upper support segment 20, viewed in the exit direction A, has aguide blade 27 a that grasps the outside of theedge fold 10, which forms during the flattening of thetubular film 1, and ensures a precise guidance of it all the way to the nip between thesqueezing rollers 5, which are positioned or situated congruently one behind the other inFIG. 1 . - Because of the articulating connection between the
individual support legs spindle drive units 28 are provided, which in the exemplary embodiment shown, engage thesupport leg 20 and thesupport leg 22 while thesupport leg 21 positioned between them has acantilever 29 that is engaged by thedrive unit 28. The drawing also shows an additional engaging arm of adrive unit 28 a, which directly engages thecantilever 29. With this configuration and through actuation of theindividual drive units tubular film 1 that are fastened to them and in particular, it is possible to optimally reproduce the arc-shaped edge curvatures that form on thetubular film 1 to be flattened and thus to achieve a significantly more precise guidance that results in a significantly improved quality of the flattenedtubular film 1. - Alternatively, it is also possible to provide a
separate drive unit 28 for eachsupport leg - The
support legs - In lieu of the three
support legs support arm 25 for a guide means. - The guide elements according to this invention can be used not only as a
lateral guide element 2, but also as a flattening element of the flattening device.
Claims (13)
1. A guide element for a tubular film (1) manufactured by a blown film extrusion process, comprising a support structure with guide means (27) fastened to the support structure and that act on a circumference of the tubular film, the support structure having a plurality of support legs (20, 21, 22) connected to one another in articulating manner and adjustably secured relative to one another by adjusting drive units (28, 28 a), and at least one guide means (27) for the tubular film (1) fastened to each one of the support legs (20, 21, 22).
2. The device as recited in claim 1 , wherein each of the support legs (20, 21, 22) has a separate adjusting drive unit (28, 28 a).
3. The device as recited in claim 2 , wherein the guide means (27) are fastened to the support legs (20, 21, 22) by at least one support arm (25).
4. The device as recited in claim 3 , wherein the guide means (27) are of rollers, drums, brush rollers, or plates on which a current of air can act to produce an air cushion.
5. The device as recited in claim 4 , wherein an angle is adjustable between succeeding support legs (20, 21, 22) and/or an axial length is adjustable of the support legs (20, 21, 22), and/or a position is adjustable of the support legs transverse to the longitudinal span.
6. The device as recited in claim 5 , wherein a guide blade (27 a) is provided at an upper end of the support structure.
7. The device as recited in claim 6 , wherein it is possible to lay the guide blade (27 a) against the tubular film 1 or, with the guide blade (27 a), to produce an air cushion for a contact-free guidance of the tubular film (1).
8. A flattening device for a tubular film (1) manufactured by a blown film extrusion process, comprising two flattening elements situated in diametrically opposite regions of the tubular film (1) and adjustable at an acute angle in relation to each other to transform an initially circular cross section of the tubular film (1), passing through oval cross sections, into a double-layered film web, and having lateral guide elements (2) situated between the flattening elements, associated with the tubular film (1), and for regions of the tubular film (1) left free by the flattening elements.
9. The device as recited in claim 1 , wherein the guide means (27) are fastened to the support legs (20, 21, 22) by at least one support arm (25).
10. The device as recited in claim 1 , wherein the guide means (27) are of rollers, drums, brush rollers, or plates on which a current of air can act to produce an air cushion.
11. The device as recited in claim 1 , wherein an angle is adjustable between succeeding support legs (20, 21, 22) and/or an axial length is adjustable of the support legs (20, 21, 22), and/or a position is adjustable of the support legs transverse to the longitudinal span.
12. The device as recited in claim 1 , wherein a guide blade (27 a) is provided at an upper end of the support structure.
13. The device as recited in claim 12 , wherein it is possible to lay the guide blade (27 a) against the tubular film 1 or, with the guide blade (27 a), to produce an air cushion for a contact-free guidance of the tubular film (1).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007030260.8 | 2007-06-28 | ||
DE102007030260 | 2007-06-28 | ||
PCT/EP2008/005118 WO2009000511A2 (en) | 2007-06-28 | 2008-06-25 | Guide element for a tubular film |
Publications (1)
Publication Number | Publication Date |
---|---|
US20100136152A1 true US20100136152A1 (en) | 2010-06-03 |
Family
ID=40186079
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/452,319 Expired - Fee Related US8430727B2 (en) | 2007-06-28 | 2008-06-25 | Device for producing blown films |
US12/452,318 Abandoned US20100136152A1 (en) | 2007-06-28 | 2008-06-25 | Guide element for a tubular film |
US12/452,317 Abandoned US20100143516A1 (en) | 2007-06-28 | 2008-06-25 | Device for producing blown films |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/452,319 Expired - Fee Related US8430727B2 (en) | 2007-06-28 | 2008-06-25 | Device for producing blown films |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/452,317 Abandoned US20100143516A1 (en) | 2007-06-28 | 2008-06-25 | Device for producing blown films |
Country Status (5)
Country | Link |
---|---|
US (3) | US8430727B2 (en) |
EP (3) | EP2160281A2 (en) |
CN (3) | CN101720271A (en) |
CA (3) | CA2691562A1 (en) |
WO (3) | WO2009000509A2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100104677A1 (en) * | 2007-06-28 | 2010-04-29 | Jens Spirgatis | Device for Producing Blown Films |
US20110101150A1 (en) * | 2009-09-18 | 2011-05-05 | Reifenhauser Gmbh & Co. Kg Maschinenfabrik | Winding device |
US10843397B2 (en) | 2016-03-11 | 2020-11-24 | Reinfenhauser Gmbh & Co. Kg Maschinenfabrik | Coextrusion adapter |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102012103095B4 (en) * | 2012-04-11 | 2017-11-23 | Windmöller & Hölscher Kg | Guiding device for guiding a blown film |
US9162403B2 (en) | 2013-03-15 | 2015-10-20 | Davis-Standard, Llc | Apparatus for manufacturing and processing pre-stretch films having strips of increased thickness |
EP3265289B1 (en) * | 2015-03-02 | 2019-05-08 | Syncro S.r.l. | Calibration cage for the production of blown films |
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- 2008-06-25 US US12/452,319 patent/US8430727B2/en not_active Expired - Fee Related
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- 2008-06-25 WO PCT/EP2008/005118 patent/WO2009000511A2/en active Application Filing
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- 2008-06-25 CN CN200880022400A patent/CN101720272A/en active Pending
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100104677A1 (en) * | 2007-06-28 | 2010-04-29 | Jens Spirgatis | Device for Producing Blown Films |
US20100143516A1 (en) * | 2007-06-28 | 2010-06-10 | Jens Spirgatis | Device for producing blown films |
US8430727B2 (en) | 2007-06-28 | 2013-04-30 | Reifenhäuser GmbH & Co. KG Maschinenfabrik | Device for producing blown films |
US20110101150A1 (en) * | 2009-09-18 | 2011-05-05 | Reifenhauser Gmbh & Co. Kg Maschinenfabrik | Winding device |
US9187282B2 (en) | 2009-09-18 | 2015-11-17 | Reifenhäuser GmbH & Co. KG Maschinenfabrik | Winding device |
US10843397B2 (en) | 2016-03-11 | 2020-11-24 | Reinfenhauser Gmbh & Co. Kg Maschinenfabrik | Coextrusion adapter |
Also Published As
Publication number | Publication date |
---|---|
CA2691561A1 (en) | 2008-12-31 |
CN101720271A (en) | 2010-06-02 |
EP2160280A2 (en) | 2010-03-10 |
EP2160279A2 (en) | 2010-03-10 |
WO2009000509A2 (en) | 2008-12-31 |
WO2009000511A2 (en) | 2008-12-31 |
EP2160279B1 (en) | 2017-03-15 |
CN101720272A (en) | 2010-06-02 |
US20100104677A1 (en) | 2010-04-29 |
US8430727B2 (en) | 2013-04-30 |
CN101720273A (en) | 2010-06-02 |
CA2691562A1 (en) | 2008-12-31 |
WO2009000511A3 (en) | 2009-03-19 |
EP2160281A2 (en) | 2010-03-10 |
US20100143516A1 (en) | 2010-06-10 |
WO2009000509A3 (en) | 2009-03-19 |
CA2691559A1 (en) | 2008-12-31 |
WO2009000510A2 (en) | 2008-12-31 |
WO2009000510A3 (en) | 2009-03-26 |
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