JP2017172063A - Industrial woven fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an industrial woven fabric, such as papermaking dryer canvas, in which a joining core wire is inhibited from coming out, and the air permeability of the folded part of the joining core wire is prevented from locally increasing.SOLUTION: The present invention relates to an industrial woven fabric including: an industrial woven fabric body woven with warp yarns and weft yarns; and a joint part joining both ends of the industrial woven fabric body. The joint part includes: joining loops 10 which are formed at the end parts of the industrial woven fabric body in such a way that the warp yarns exposed by removing the weft yarns from the end parts of the industrial woven fabric body are folded back, and through which a joining core wire 3 is inserted; and closed loops 20 which are alternately formed with the joining loops 10, and which hold a most front weft yarn 2a. On one selvage side of the joint part in the longitudinal direction of the industrial woven fabric, the end part of the joining core wire is folded back. In the folded part of the joining core wire, the warp yarn forming the closed loop is wound and entangled with the most front weft yarn.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an industrial fabric such as a paper dryer canvas having an improved joint.

  Industrial fabrics such as paper dryer canvas (hereinafter also referred to as canvas) used in the dryer part of a paper machine are made by weaving an industrial fabric body with warp and weft yarns. Joints are provided at both ends, and both ends of the industrial textile body are connected and used as an endless shape.

  In Patent Document 1, a warp yarn is extended and folded from the ends and ends of the canvas to be joined, and a loop is formed at the end of the canvas by binding the yarn end into the canvas. In the joint of the paper dryer dryer canvas that joins the ends of the canvas by joining the ends of the canvas by connecting the ends of the canvas by connecting the ends of the canvas by engaging the loops of the ends and engaging the loops of the ends. Disclosed is a paper-making dryer canvas joint in which a gap due to the lack of weft yarn is formed on the ear side of at least one end of the canvas, and the end of the joining core wire inserted through the common hole is folded and inserted into the gap. ing. Patent Document 2 discloses a warp loop seam structure in which a joint formed at the center of a canvas body is connected to a loop formed by folding the warp yarn of the canvas body. There is disclosed a joint for a paper-making dryer canvas having a spiral seam structure in which the joint is connected with a spiral filament hooked to the ear of the canvas body.

Japanese Utility Model Publication No. 2-115598 Registered utility model No. 2508541

  However, in the canvas described in Patent Document 1, the bonding core wire is folded and stored, but since there is nothing to connect the bonding core wire, it is easy to come off when the canvas travels, and the bonding core wire As a result, the joint opens from the end, and may eventually break. In addition, when inserting the joining core wire when joining both ends of the canvas, when the joining core wire is passed through the loop common hole at a constant interval, the joining core wire is pulled too much, and the stored joining core wire is removed. It is easy to return, and re-insertion of the joining core wire frequently occurs. Further, a space for storing the joining core wire is large, and the ear portion has locally high air permeability. If the ears have locally high air permeability, when the canvas runs on a large number of heating cylinders or guide rolls, the cylinder rolls will have a slight parallelism error, causing the canvas to meander left and right. When the canvas is deformed (curved) and contracted in the width direction, the space for storing the joining core wire enters the paper passing range, which becomes a paper sheet defect due to drying unevenness due to high air permeability. Further, since the gap is formed due to the lack of the weft yarn, the end processing of the weft yarn is not cut, so that the weft yarn itself is pulled out to the surface and pressed against the paper sheet, which becomes a defect. Also in the canvas described in Patent Document 2, the core wire for joining is easily pulled out, and since the space of the ear portion is large, the air permeability is locally increased, and a paper sheet defect tends to occur.

  Therefore, the present invention provides an industrial fabric such as a papermaking dryer canvas in which the disconnection of the joining core wire is suppressed and the air permeability of the folded portion of the joining core wire is prevented from being locally increased.

  The present invention is an industrial fabric including an industrial fabric body woven with warp and weft yarns, and a joint portion connecting both ends of the industrial fabric body, and the joint portion is an end of the industrial fabric body. The warp yarn exposed by removing the weft yarn from the part is folded back and the joining loop formed by inserting the joining core wire formed at the end of the industrial textile body, and the joining loop are alternately formed, and the cutting edge The end of the bonding core wire is folded on one ear side of the joint in the longitudinal direction of the industrial fabric, and the folded portion of the bonding core wire The present invention relates to an industrial fabric characterized in that the warp yarn forming the binding loop is wound and entangled with the latest weft yarn.

  In the industrial fabric of the present invention, the joining core wire is preferably folded back toward the machine surface side.

  The industrial fabric is preferably a papermaking dryer canvas.

  According to the present invention, the warp yarn forming the binding loop is wound at the folded portion of the joining core wire and entangled with the most advanced weft yarn, that is, joined by the joining core clip and the gap filling unit by the binding loop. By sandwiching the core wire, the pulling strength of the joining core wire is improved. This leads to the prevention of breakage due to the opening of the joint portion when the joining core wire is pulled back due to the behavior in the running of the industrial fabric. In addition, since there is no disconnection, there is no re-insertion in the insertion operation of the joining core wire. Furthermore, since the minimum space necessary for storing the joining core wire is not impaired, there is no problem that it is difficult to insert the joining core wire, and there is little change in air permeability by filling the space. Even when the industrial fabric is used as a canvas according to an embodiment and the canvas is deformed and the storage space enters the paper passing width range, drying unevenness does not occur.

FIG. 1A is a plan photograph (20 times) of the paper contacting surface side of the folded portion of the joining core wire of the industrial fabric of the present invention, and FIG. 1B is a plan photograph (20 times) of the machine surface side. FIG. 2 is a cross-sectional photograph (20 ×) of a folded portion of a joining core wire of an industrial fabric according to an example of the present invention. FIG. 3A is a plane photograph (20 times) of a joint part of an industrial fabric of an example of the present invention, and FIG. 3B is a cross-sectional photograph (times). 4A is a plan photograph (20 times) of the paper contacting surface side of the folded portion of the joining core wire of the industrial fabric of Comparative Example 1, and FIG. 4B is a plan photograph (20 times) of the machine surface side. FIG. 5 is a cross-sectional photograph (20 ×) of the folded portion of the joining core wire of the industrial fabric of Comparative Example 1. It is a graph which shows the result of the drawing strength of the core wire for joining. It is a graph which shows the measurement result of air permeability.

  In the present invention, the industrial fabric is not particularly limited. For example, the fabric for papermaking machines such as a dryer canvas for papermaking, a conveyor belt for a cutter machine, and various sludge and slurry dehydrating machines including a belt press dehydrator. Includes filter belts, general conveyor belts, general dryer belts, and the like. In particular, the industrial fabric of the present invention can be suitably used as a papermaking dryer canvas.

  Industrial textiles, such as a dryer canvas for papermaking of this invention, contain the joint part provided in the edge part of an industrial textile main body and an industrial textile main body. The joint portion is a joining loop that passes through a joining core wire that is formed by folding back the warp yarn that is exposed by removing the weft yarn from the end portion of the industrial fabric body, and is formed at the end portion of the industrial fabric body. Alternately formed with the joining loops, it has a binding loop that holds the most advanced weft thread.

  In industrial fabrics such as conventional dryer canvas for papermaking, gaps were formed by the lack of weft in the folded portion of the joining core wire on the ear side of the joint. When the woven fabric travels, the joint core opens from the end due to the joining core wire coming off, and eventually breaks. In addition, during the insertion operation of the joining core wire, slipping occurred, and many reinsertions occurred. Further, there is a problem that the air permeability of the ear portion is locally increased due to the gap. On the other hand, in the industrial fabric of the present invention, the warp loop forming the binding loop is wound around the folded portion of the bonding core wire and entangled with the most advanced weft yarn, so that the binding loop is a clip of the bonding core wire. As well as having a grip function, it functions as a structure that fills the gap, so that the joining core wire can be sandwiched, and the joining core wire can be prevented from coming off.

  In the folded portion, the joining core wire is preferably folded back toward the machine surface side. The paper-contacting surface side tends to be flat, and it is difficult to cause mark defects on the paper sheet.

  The warp yarn forming the binding loop is preferably wound once or twice from the viewpoint of easily exhibiting the function of hugging the most advanced weft yarn.

  In the present invention, the industrial woven fabric body such as a canvas body may be either a single woven fabric or a multiple woven fabric of double woven fabric or more. Further, the woven structure is not particularly limited as long as the warp yarn can form a loop. The woven structure may be any of other structures such as plain weave, twill weave, satin weave, and modified weave, and combinations thereof.

  In the present invention, the material of the warp yarn and the weft yarn woven with the industrial textile main body such as the canvas main body is not particularly limited, and is selected from the group consisting of polyester such as polyethylene terephthalate, polyamide, polyphenylene sulfide, polyether ether ketone and the like. One or more synthetic resins are preferable, and from the viewpoint of durability, it is more preferable to include polyester such as polyethylene terephthalate. Further, for both the warp yarn and the weft yarn, a monofilament yarn made of a synthetic resin, a multifilament yarn made of a synthetic resin, or the like can be used. In the present invention, a monofilament yarn, a multifilament yarn, or the like made of a synthetic resin material similar to the warp yarn or the weft yarn can be used as the joining core wire. From the viewpoint of durability, it is preferable that all of the warp yarn, the weft yarn and the joining core wire are monofilaments of polyester such as polyethylene terephthalate.

  In the present invention, the number of yarns driven (in density) per unit length of an industrial textile body such as a canvas body is not particularly limited, but the warp yarn is 25 to 130 yarns / 1 inch (25.4 mm). More preferably, it is 40-130 pieces / inch (25.4 mm). The weft is preferably 10 to 80 pieces / inch (25.4 mm), and more preferably 30 to 80 pieces / inch (25.4 mm). Thereby, abrasion resistance can be improved, maintaining the uniformity of the surface of an industrial fabric.

  In the present invention, the cross-sectional shape and the wire diameter of the warp yarn and the weft yarn woven from the industrial textile main body such as the canvas main body are not particularly limited, but in the case of a circular cross section, the diameter is 0.2 to 1.2 mm. It is preferable that the thickness is 0.4 to 0.9 mm. In the case of a flat cross section, the long side is preferably 0.4 to 1.2 mm, more preferably 0.4 to 0.7 mm, and the short side is preferably 0.2 to 0.8 mm. More preferably, it is 0.2 to 0.6 mm. Accordingly, the wear resistance can be improved while maintaining the uniformity of the surface of the industrial fabric, and the joint portion can be balanced to form a smooth joint portion.

  In the present invention, the cross-sectional shape and the wire diameter of the joining core wire are not particularly limited, and may be appropriately selected and used based on the cross-sectional shape and wire diameter of the warp yarn and the weft yarn woven from the industrial fabric body. From the viewpoint of easy insertion of the bonding core wire into the bonding loop, that is, from the viewpoint of easy insertion through the common hole of the bonding loop formed by engaging the bonding loops at the ends of the two industrial fabrics to be bonded. A circular cross section is preferred, the wire diameter is preferably 0.4 to 1.1 mm, and more preferably 0.45 to 1.0 mm.

  In the present invention, the ear side of the industrial fabric joint portion refers to, for example, a non-paper passing portion in the case of a canvas, and a portion on which a conveyed product is not placed in the case of a general conveying belt.

  Hereinafter, the present invention will be described in detail based on examples. However, the present invention is not limited to the following examples.

Example 1
A monofilament made of polyethylene terephthalate (hereinafter also referred to as “PET”) having a circular cross section and a fiber diameter of 0.55 mm as a warp yarn, and a monofilament made of PET having a circular cross section and a fiber diameter of 0.65 mm as a weft thread Prepared. A woven fabric body having a double woven structure having a warp yarn density of 54.0 yarns / 吋 (2.54 cm) and a weft yarn density of 25.5 yarns / 吋 was produced. The weft thread is removed from the end of this fabric body over approximately 23 cm, the weft-like warp thread that is exposed by removing the weft thread is folded back, and the joining loop that inserts the joining core wire, and the most advanced weft thread Fastening loops were alternately formed, and the ends of these warp yarns were knitted into the woven fabric body to produce a joint portion. At this time, as shown in FIG. 1A and FIG. 1B, a warp yarn 1a forming a binding loop is wound around the folded portion (5 cm in length) of the joining core wire on one ear side of the joint portion, so that the cutting edge is formed. The yarn 2a was entangled. Thereafter, as shown in FIGS. 1 to 3, the diameter of the common hole of the joining loop 10 formed by meshing the joining loop formed at the ends of the two fabric bodies is 0.6 mm, After 0.7 mm, 0.8 mm, and 0.9 mm bonding core wire 3 (PET monofilament) was inserted and bonded, it was folded back to the folded portion. As shown in FIGS. 1A and 1B, the bonding core wire 3 was folded back toward the machine surface side. FIG. 3A shows a surface photograph (20 times) of the joint portion other than the folded portion, and FIG. 3B shows a cross-sectional photograph (20 times) thereof. FIG. 2 shows a cross-sectional photograph of the folded portion.

(Comparative Example 1)
A woven fabric body was produced in the same manner as in Example 1. The weft thread is removed from the end of the obtained fabric main body over about 23 cm, the warp-like warp thread exposed by removing the weft thread is folded back, and a joining loop for inserting the joining core wire, Binding loops were formed by alternately forming the binding loops to hold the weft yarn, and the ends of these warp yarns were knitted into the woven fabric body. At that time, as shown in FIG. 4, a gap was formed in the folded portion (5 cm in length) of the joining core wire on one ear side of the joint portion by lacking the most advanced weft. Thereafter, as shown in FIG. 4, the diameters of the joint loop common holes formed by engaging the joint loops formed at the ends of the two fabric bodies are 0.6 mm, 0.7 mm, 0 .8 mm and 0.9 mm bonding core wires (PET monofilaments) were respectively inserted and bonded, and then folded back to the folded portion. In Comparative Example 1, the structure of the joint part other than the folded part was the same as that of Example 1. FIG. 5 shows a cross-sectional photograph of the folded portion.

  From FIG. 2, in Example 1, the joining loop 10 and the binding loop 20 are alternately formed, and the warp yarn 1a forming the binding loop 20 is wound and entangled with the cutting edge weft yarn 2a. It has been found that the loop 20 functions as a grip for the joining core wire and also functions as a structure for filling the gap, and sandwiches the joining core wire. On the other hand, as can be seen from FIG. 5, in the first comparative example, the binding loop 200 only holds the cutting edge weft thread 102a, and the warp thread 101a forming the binding loop 200 is twisted to cut the cutting edge weft thread 102a. By being not entangled with, the gap is large and the joining core wire is easy to come off.

  The pulling strength of the joining core wire in the joint part of the fabric of Example 1 and Comparative Example 1 was evaluated as follows, and the results are shown in Table 1 and FIG. Moreover, the air permeability in the fabric body of Example 1 and Comparative Example 1 (hereinafter also referred to as “main body”) and the folded portion of the joint portion (hereinafter also referred to as “ear portion”) was evaluated as follows. The results are shown in Table 2 below and FIG.

(Pullout strength of core wire for joining)
Using a tensile testing machine ("RTC-1310" manufactured by Orientec Co., Ltd.) from the opposite side of the folded portion, the bonding core wire is pulled at a tensile speed of 200 mm / min, and the tensile strength (integrated average load) is obtained. The pulling strength of the core wire was evaluated. Higher pulling strength means that the bonding core wire is less likely to come off.

(Air permeability)
The air permeability of the main body and the ear portion of the fabric was measured according to JIS L 1096 with an air permeability tester (“FX-3300” manufactured by TEXTEST).

  As can be seen from the results in Table 1 and FIG. 6, in Example 1, the warp yarn forming the binding loop is wound around the folded portion of the joining core wire and is entangled with the most advanced weft yarn. As a result, the pulling strength of the bonding core wire was improved. This leads to the prevention of breakage due to the opening of the joint portion when the joining core wire is pulled back due to the behavior in the running of the industrial fabric. In addition, since the joining core wire does not come off, there is no need to reinsert the joining core wire. Furthermore, there is no problem that it is difficult to insert the joining core wire.

  Further, as can be seen from the results of Table 2 and FIG. 7, in Example 1, the minimum space necessary for storing the joining core wire was not impaired, and the air permeability change was small by filling the space of the folded portion. This means that, for example, when used as a canvas in a papermaking operation, drying unevenness does not occur even when the canvas is deformed and the joining core wire storage space enters the paper passing width range.

1a, 101a Warp yarn 2a, 102a Weft yarn 3, 103 Joining core wire 10, 100 Joining loop 20, 200 Binding loop

Claims (3)

An industrial fabric body comprising an industrial fabric body woven with warp and weft yarns, and a joint portion connecting both ends of the industrial fabric body,
The joint portion is a joining loop that passes through a joining core wire that is formed by folding back the warp yarn that is exposed by removing the weft yarn from the end portion of the industrial fabric body, and is formed at the end portion of the industrial fabric body. It is alternately formed with the joining loop, and has a binding loop that holds the most advanced weft thread,
On one ear side of the joint portion in the longitudinal direction of the industrial fabric, the end portion of the joining core wire is folded, and the warp yarn forming the binding loop is wound around the folded portion of the joining core wire. An industrial fabric characterized by being entangled with cutting-edge weft yarns.   The industrial fabric according to claim 1, wherein the joining core wire is folded back toward the machine surface side.   The industrial fabric according to claim 1 or 2, wherein the industrial fabric is a papermaking dryer canvas.