|Publication number||US2428097 A|
|Publication date||Sep 30, 1947|
|Filing date||Dec 23, 1941|
|Priority date||Dec 23, 1941|
|Publication number||US 2428097 A, US 2428097A, US-A-2428097, US2428097 A, US2428097A|
|Original Assignee||Asten Hill Mfg Co|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (7), Referenced by (8), Classifications (12)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Sept 30, 1947. J. RosLUND l2,428,097
DRIER FELT SEAM SECURING STRIP AND SEMI FORMED THEREWITH Filed Dec. 25, 1941 2 Sheets-Sheet 1 Sept. 30, 1947. J. RosLuND 2,428,097
DRIER FELT SEAM SECURING STRIP AND SEM FORMED THEREWITH Filed Dec. 23, 1941 sheets-sheet 2 Lm /11 a Patented Sept. 30, 1947 DRIER FELT SEAM SECURING STRIP AND SEAM FORMED THEREWITH John Roslund, Phila delpha,
Pa., assignor to Asten-Hill Mfg. Co., Philadelphia, Pa., a corporation of Delaware Application December Z3, 1941, Serial No. 424,201 6 Claims. (Cl. 154-42) the individual who forms the seam.
It is still another object the cemented have scattered thereith. 'I'he invention will be understood by reference to the accompanying detailed description and the appended drawings.
In such drawings: Fig. 1 is a plan view of a. cement strip for drier felt seams according to the invention;
Fig. 2 is a corresponding view showing a modification of strip of Fig. 1;
from the strip into the fabric;
Fig. 6 is a more or less diagrammatic view ardized length of say two feet, such as can be easily handled, and to use the required number of strips end to end to extend across the full width of the particular felt to be seamed. The strips are sumciently thin so that any excessive length of the strip may be cut off.
As heretofore mentioned the thickness of the strip is an extremely important factor, since it determines the degree of penetration of the cement of the strip into the opposing fabric portions to be joined. The thickness of the strip must be carefully controlled to provide an adequate quantity of cement to be absorbed in the pores of the fabric and leave an adequate quantity of cement at the opposing faces of the fabric sections to time the accomplish this, since otherwise the cement is likely to penetrate through to the working surface of the felt, destroying its moisture absorbing capacity completely and tending to cause paper to stick to the felt.
A three ply drier felt having asbestos threads in its surface ply, which is one of the standard types of drier felt extensively used in paper mills, has a thickness varying .between 2 mm. and 3 mm. For such a felt it has been determined that adequate but not an excessive quantity of cement is obtained by forming the cement strip with a thickness between .5 mm. and 1 mm. It will be found that a strip having a thickness of approximately .75 mm. is extremely satisfactory in connection with felts of the type just referred to and also for felts not including asbestos threads but having the same general characteristics as to thickness.
It is an essential characteristic of the cement strip that the same shall be of substantially less thickness than the thickness of the individual fabric sections to be joined. `Regardless of the thickness of the drier felt fabric, it now appears to me that the thickness of the cement strip should not be more than 35% of the thickness of the felt fabric. To provide a sufficient cement content in the strip it also that the thickness of the cement strip should not be less than approximately 25% of the thickness of the felt fabric in order that a sufficient cement content may be assured to give the necessary strong bond.
It is of course important to use a cement which is waterproof and heat resistant for a drier felt seam, since the drier felt conducts the paper around heated calendering rolls which drive hot moisture from the paper into the felt fabric. It is preferred to use a cellulose acetate cement because of its ability to satisfy these conditions.
' The cement strip will of course be hard. and may be softened at the time of formation of the seam through the use of a volatile solvent, or equivalent softening agent which will function at ordinary temperatures.
While the degree of penetration of the cement through the felt may be limited by controlling the thickness of the cement strip, and thus the porosity of the felt for a substantial portion of its thickness adjacent the working surface maintained, it is obvious that the presence of the cement cuts down the total absorptive capacity of the felt at the seam to the extent that it does penetrate the felt fabric. To offset this condition, it is desirable to provide the cement strip with recurrent openings of appreciable size at frequent intervals. The openings may be circular as indicated at Il in Fig. 1, or may be elongated 7 o together.
7o within practical limits as otherwise as indicated by the slotted openings Il' in the cement strip ill of Fig. 2. The openings will be uniformly arranged and preferably staggered throughout the entire area of the cement strip.
g When the cement strip is used in forming a seam 10 face of the felt can readily penetrate. This not only tends to prevent the felt at the seam areas from running wet, but greatly facilitates the drying of the felt in such area when reconditioning the same after prolonged use in accordance with u the usual practice.
In forming a lapped seam in a drier felt the opposite ends a. and b of the felt will be overlapped for a length somewhat greater than the width of the cement strip I0, all as shown in Fig. 3.
This is because the cement tends to spread when it is softened, and it is obviously desirable that it should not spread beyond the felt extremities. In practice the lower end b of the felt will be placed upon a suitable fiat base. A volatile solvent or other softener will then be applied thereto, em-
ploying about a quart of solvent for each five feet of width of the felt. The cement strip l0 will then be placed on top of felt end b in the position as shown in Fig. 3. The upper felt end a so will be similarly treated with solvent and then be superposed upon the cement strip l0. A suitable pressure member will then be placed over the laminated structure. The solvent will soften the cement and cause the same to flow, entering the fabric'of the felt ends for a distance adjacent the opposing surfaces thereof. Penetration of the cement into the fabric will be facilitated by the pressure through the pressure member, and the opposing surfaces of the felt ends will be forced The condition of the seam at the time the felt end a is superposed upon the cement strip isl shown in Fig. 4, and the condition after the cement has softened and penetrated into the fabric of the felt ends is represented in Fig. 5. As
the volatile solvent vaporizes 0E the cement sets and hardens, and the felt will be ready for use in a very short time after the seam is formed.
Because of the tendency of the cement of the strip to spread when it is softened it is important that the openings formed therein shall be of sufficiently large size as not to be destroyed under spreading of the cement. While the size of the openings as well as their shape may vary considerably, they must have a certain minimum size so that they will provide permanent openings through the cemented seam at relatively close recurrent intervals for the purposes above mentioned. Where circular openings Il are employed as in the strip of Fig. 1 it is preferred to make them with the diameter of about i0 mm. or larger, making allowance for the fact that their diameter will decrease to some extent, perhaps as much as 25% or more when the cement softens, even though the cement strip is itself comparatively It is obvious that the greater the total area of theopenings in relation to the bonded area of the fabric, the greater will be absorptive capacity of the drier -felt at the seam. 0f course the total area of the openings should be kept there will be insufficient bonding to make a strong seam which will withstand the longitudinal strain on the drier felt during operation.
While the cement strip may be composed solely 5 of cement, it is preferred to form the same by the use in joining amorbent fabrics. strip I3 after leaving It will be evident to that the present invention provides a foolproof 1. A seam forming device the ends of a thick absorbent fabric drier felt in a cemented strongly bonded lapped seam devoid 2. A seam forming device the ends of a thick absorbent fabric drier felt for securing together i action of solvent to spread lengthwise along the lapped surfaces of the end portions.
' felt cemented seam according to wardly from the of cement and capable of absorbing moisture.
REFERENCES CITED The following references are Iile of this patent:
UNITED STATES PATENTS of record in the Number Name Date 1,383,726 Kiracofe July 5, 1921 1,955,083 Muller Apr. 27, 1934 1,970,755 Knoll Aug. 21, 1934 2,089,469 Dix Aug. 10, 1937 1,038,874 Goodsir, J1' Sept. 17, 1912 2,294,088 Kholos Aug. 25, 1942 1,536,533 Sheehan May 5, 1925 OTHER REFERENCES Publication .entitled Paper Trade' Journal, pages 41,and 42 of November 17, 1932.
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|US7311792 *||Jan 30, 2004||Dec 25, 2007||Kimberly-Clark Worldwide, Inc.||Process for making a splice for a stabilized absorbent|
|US7381307||Dec 15, 2003||Jun 3, 2008||Tamfelt Oyj Abp||Method of manufacturing a press felt, and a press felt, with the shape of a closed loop|
|US20040182498 *||Jan 30, 2004||Sep 23, 2004||Kimberly-Clark Worldwide, Inc.||Process for making a splice for a stabilized absorbent|
|US20040185214 *||Jan 30, 2004||Sep 23, 2004||Kimberly-Clark Worldwide, Inc.||Personal care absorbent article having spliced absorbent material|
|US20060016571 *||Dec 15, 2003||Jan 26, 2006||Tampere Oyj Abp||Method of manufactring a press felt, and a press felt, with the shape of a closed loop|
|U.S. Classification||428/57, 24/DIG.110, 428/138, 428/190, 24/38|
|International Classification||B29D5/00, D21F7/10|
|Cooperative Classification||D21F7/10, Y10S24/11, B29D5/00|
|European Classification||B29D5/00, D21F7/10|