Shoe press jacket

Details Shoe press jacket Shoe press jacket

1998-10-20

2001-04-10

Copenheaver, Blaine (Department: 1771)

Fabric (woven, knitted, or nonwoven textile or cloth, etc.)

Coated or impregnated woven, knit, or nonwoven fabric which...

C162S358400, C162S901000, C427S358000, C442S189000

Reexamination Certificate

active

06214752

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a shoe press jacket with minimal surface abrasion and dimensional change.
A general shoe press is composed, as shown in
FIG. 4
, of a top roll
12
, a top felt
13
, a wet web
14
, a bottom felt
13
′, a jacket
11
and a shoe
15
so that the top felt
13
, the wet web
14
, the bottom felt
13
′ and the jacket
11
are rotated together with the top roll
12
as the driving source.
As shown in
FIG. 3
, the jacket
11
is composed of a fabric
1
′ coated with a resin
6
′. In most conventional jackets
11
, in order to prevent abrasion due to friction between the jacket
11
and the shoe
15
, only the side
11
a
of the fabric
1
′ in contact with the shoe is coated with resin, and the surface side
11
b
′ is exposed.
However, the jacket
11
has a short life because the surface side
11
b
′ wears due to slippage between the jacket
11
and the back of the bottom felt
13
′ as the jacket
11
rotates in contact with the back of the bottom felt
13
′. The jacket
11
also frays due to abrasion.
As a countermeasure against the wear and abrasion of the jacket
11
on the surface side
11
b
′, a jacket
11
of a type in which the surface side
11
a
is also coated with resin has also been developed. Examples of this type jacket are shown in Japanese Patent Publication Nos. 57236/1991 and 15398/1988.
However, the jackets of Japanese Patent Publication Nos. 57236/1991 and 15398/1988 tend to have large deformations in the MD (machine direct) and CD (cross machine direct) directions. This is partly because the fixing force of the base fabric layer due to the resin is inferior owing to the thin resin layer on the surface side, and partly because the resin on the surface side is cracked because of dimensional change in the base fabric layer and the surface abrasion causes moisture from the surface side to percolate through the interior causing swelling.
If this type jacket is used in a closed type shoe press, a situation develops that compels the machine to be stopped during use for repairs such as width trimming or replacing the jacket.
SUMMARY OF THE INVENTION
The present invention minimizes the above-described defects, and its object is to provide a shoe press jacket capable of reducing dimensional change in the MD (machine direct) and CD (cross machine direct) directions and surface abrasion during use.
In order to achieve the above-described objects, a shoe press jacket according to the present invention is constituted by coating a base fabric layer consisting of woven cloth having filament yarn of straight or nearly straight arrangement in at least one of warp and weft with resin from one surface thereof, filling the thickness of the base fabric layer with the resin and forming a coated layer on the opposite surface thereof so that dimensional stability in the MD and CD directions is given by filament yarn of straight or nearly straight arrangement and that resin layers, with which one surface and the opposite surface of the base fabric layer are coated, and the base fabric layer which is filled with resin, are made integral with each other to make it difficult to separate them for reliably preventing surface abrasion during use.
As regards the filament yarn of straight or nearly straight arrangement, in the case of the base fabric layer being double warp or triple warp, when the filament yarn is inserted in the weft direction, the crosswise modulus increases, and change in width at the time of heat setting and tentering in use decreases, resulting in a construction difficult to extend in the width direction. Also, in the case of the base fabric layer being double weft or triple weft, when the filament yarn is inserted in the warp direction, the lengthwise modulus increases, and change in the length direction at the time of heat setting and the change in tension during resin treatment decrease, resulting in a construction having high strength omnidirectionally capable of manufacturing stable products.
Additionally, the invention may be characterized in that the same yarn as the ground yarn or dimensionally-stable yarn is used for the filament yarn of straight or nearly straight arrangement. If the material for the ground yarn is dimensionally-stable yarn, the same dimensionally-stable yarn as the ground yarn can be used as the straight or nearly straight component, and if the ground yarn is not dimensionally-stable yarn, a dimensionally-stable yarn can be used as the straight or nearly straight component. Namely, the base fabric layer is constituted so that the dimensional change in the MD and CD directions during use can always be reduced irrespective of the material for the ground yarn.


REFERENCES:
patent: 4946731 (1990-08-01), Dutt
patent: 5772848 (1998-06-01), Dutt
patent: 63-15398 (1988-04-01), None
patent: 3-57236 (1991-08-01), None

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