JPH0537999U - Papermaking dryer canvas - Google Patents

Abstract

(57) [Abstract] [Purpose] The paper-bonding surface of the joining loop (1) formed by folding back the warp yarns (2) at both ends of a double-woven or multi-woven canvas using a flat yarn as the warp yarn (2). It prevents bulging toward the (a) side and prevents the surface smoothness of the paper from being impaired. [Construction] In a dryer canvas for double-woven or multi-woven paper making, which uses flat yarns as warp yarns (2), the warp yarns (2) at both ends are folded back to form a joining loop (1).
In forming the final weft (3)
Weave both ends of the canvas without inserting a).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a paper machine dryer canvas used in the dry part of a paper machine.

[0002]

[Prior Art]

 Various means for joining endlessly the dryer canvas for papermaking have been proposed.The weft yarns at both ends of the woven canvas are removed over a specified width to form a comb-shaped warp, and this warp is incorporated into the canvas weave design. A method is generally used in which a joining loop is formed by weaving the joining loop, and both ends of the canvas are brought into abutment with each other, the joining loops are meshed with each other, and the core wire is inserted therein. It is conceivable to form a joining loop by the same method in a canvas using flat yarn as the warp.

However, in the case of the flat yarn, as shown in FIG. 2, in the structure in which the paper-contact surface (a) side and the machine-surface (b) side are asymmetric, the joining loop (1) is formed. It is necessary to twist the warp (2) 180 °.

[0004]

[Problems to be solved by the device]

 When the warp (2) is twisted to form the joining loop (1), the twist of the flat yarn pushes the final end weft (3a) on the paper-contacting surface (a) side toward the paper-contacting surface (a) side. become. Therefore, the joining loop (1) swells and protrudes toward the paper contact surface (a) side, and the surface smoothness of the joint portion cannot be obtained. For this reason, marks may be generated on paper that requires a delicate surface such as high-quality paper or thin paper.

[0005]

[Means for Solving the Problems]

 As a means for solving the above-mentioned problems, the present invention is a papermaking dryer canvas woven with a flat yarn as a warp in a double weave or a multiple weave, in which warp yarns at both ends of the canvas are twisted back by 180 ° to form a joining loop. It is intended to provide a dryer canvas for papermaking, which is formed by weaving without inserting the final end weft on the side of the paper contacting surface.

[0006]

[Action]

 When weaving a canvas at both ends of the canvas without inserting the final weft yarn on the paper contact side, when the flat warp is twisted back 180 ° to form a loop for joining, the loop for joining may swell. Since it disappears and the joint part becomes smooth, there is no adverse effect such as marks on the paper.

[0007]

【Example】

 FIG. 1 is an enlarged structural diagram of the edge of a papermaking dryer canvas showing an embodiment of the present invention. The warp (2) has a 0.30 mm × 0.56 mm tetron (T-trade name-polyethylene terephthalate fiber). A monofilament (TM030 × 056) is used, which is a flat yarn with a flat cross section. The weft yarn (3) is a double twill weave composed of two layers of Tetoron monofilament (TM080) with a diameter of 0.80 mm. Has a warp density of 54.7 strands / 2.54 cm and a weft density of 16.0 × 2 strands / 2.54 cm. The warp yarns (2) at both ends of the canvas are divided into those for forming the joining loop (1) and those for not forming the joining loop (1) alternately or at appropriate setting intervals so that the joining loop (1) is not formed. , It is folded back and stitched into the original tissue to prevent the weft thread (3) at the end of the canvas from falling off.

However, since the warp (2) forming the joining loop (1) cannot be folded back and stitched into the original tissue as it is, it is twisted by 180 ° and is stitched into the original tissue. In this case, according to the present invention, the canvas is woven without inserting the final weft (3a) on the paper contacting surface (a) side of the canvas. In this way, if the canvas is woven without inserting the final end weft (3a) on the paper contacting surface (a) side of the canvas, the weft (2) for forming the joining loop (1) is 180 °. Even when it is twisted back and bound into the original tissue, the twisted portion of the warp (2) does not push the final end weft (3a) on the paper contacting surface (a) side toward the paper contacting surface (a) side. The joining loop (1) will not swell and the joint will be smooth.

Although the above-mentioned embodiments exemplify the case of the double weave, they are similarly applied to the case of the multiple weave other than this.

[0010]

[Effect of the device]

 In the papermaking canvas according to the present invention, since the joining loop does not swell, the joint portion becomes smooth and there is an effect that a mark or the like is not adversely affected on the paper.

[Submission date] July 23, 1992

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

[0004]

[Problems to be solved by the device]

 Generally, in a design in which the paper-contacting surface (a) side and the machine-surface (b) side are asymmetric, the final end weft (3a) portion on the paper-contacting surface (a) side tends to protrude toward the paper-contacting surface (a) side. There is. This protrusion is a tissue defect in the loop for joining the asymmetric tissue canvas. Particularly in a canvas using a flat yarn as the warp yarn (2), the protrusion toward the paper contact surface (a) side is remarkable. When the warp (2) is twisted to form the joining loop (1), the twist of the flat yarn pushes the final end weft (3a) on the paper-contacting surface (a) side toward the paper-contacting surface (a) side. become. For this reason, the joining loop (1) bulges and projects toward the paper contact surface (a) side, and the surface smoothness of the joint portion cannot be obtained. For this reason, marks may be generated on paper that requires a delicate surface such as high-quality paper and thin paper.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction content]

[0005]

[Means for Solving the Problems]

 As a means for solving the above problems, the present invention is a papermaking dryer canvas woven with a flat yarn as a warp in a double weave or a multiple weave, in which warp yarns at both ends of the canvas are twisted back by 180 ° to form a joining loop. The present invention provides a dryer canvas for papermaking, which is characterized by being woven without using a weft that is the final end yarn on the paper contact side.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006]

[Action]

 When weaving the canvas without using the weft that becomes the final end yarn on the paper contact side at both ends of the canvas, when the flat warp is twisted back 180 ° to form the joining loop, the joining loop should swell. Is eliminated and the joint becomes smooth, so there is no adverse effect such as marking on the paper.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

However, the warp yarn (2) forming the joining loop (1) cannot be folded back and stitched into the original tissue as it is, and therefore is twisted by 180 ° and stitched into the original tissue. In this case, the present invention is to weave the canvas without using the weft thread (3a) which is the final end thread on the paper contact surface (a) side of the canvas. In this way, when the canvas is woven without using the weft thread (3a) which is the final end thread on the paper contacting surface (a) side of the canvas, the warp thread (2) for forming the joining loop (1) is formed. Even when it is twisted back by 180 ° and stitched into the original tissue, the twisted portion of the warp (2) does not push the final end weft (3a) on the paper contact surface (a) side toward the paper contact surface (a) side. Therefore, the joining loop (1) does not swell and the joint portion becomes smooth.

[Brief description of drawings]

FIG. 1 is an enlarged organization chart of the edge of a papermaking dryer canvas showing an embodiment of the present invention.

[Fig. 2] Organization chart showing a conventional example of a paper dryer dryer canvas.

[Explanation of symbols]

 1 Loop for joining 2 Warp 3 Weft 3a Final end weft on the side of the paper surface a Paper contact surface

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[Procedure amendment]

[Submission date] July 23, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Item name to be amended] Scope of utility model registration request

[Correction method] Change

[Correction content]

[Scope of utility model registration request]

Claims (1)

[Scope of utility model registration request] 1. A dryer canvas for papermaking, which is woven in a double weave or a multiple weave using flat yarns as warp yarns, wherein the warp yarns at both ends of the canvas are twisted back by 180 ° to form a joining loop. A dryer canvas for papermaking, characterized by being woven without inserting the final end weft on the paper-contacting surface side.