JPH1181174A - Double woven fabric for papermaking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a rise in power load by reducing the resistance on the side of a running surface in running a woven fabric for papermaking. SOLUTION: This double woven fabric for papermaking is obtained by integrating each single woven fabric in which the side of a papermaking surface is a plain weave and the side of a running surface is a five-sheeted twill weave with connecting yarns Bi and the five sheeted twill weave on the side of the running surface is 3/2. In the double woven fabric, the number of the warp yarns Wa based on unit width is the same as that on the side of the papermaking surface and the ratio of the numbers of the weft yarns Wf on the side of the papermaking surface to the side of the running surface is either one of 1:1 and 2:1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a papermaking fabric.

[0002]

2. Description of the Related Art Conventionally, papermaking fabrics have been improved in terms of surface smoothness, papermaking yield, abrasion resistance and the number of days of use of the fabrics have been increased, and the power load on papermaking machines has been reduced. To get a stable running of the machine, rigidity,
Various improvements have been made for the purpose of improving posture stability, etc., but the above points are related to each other, and it is necessary to improve each point.

In this respect, the power load depends on the performance of the papermaking fabric. If the area of contact between the running surface side of the papermaking fabric and the machine is large, the power load will increase due to frictional resistance, and the suction of the suction box will occur even if the paper machine may stop or may not stop. It is known that an operation such as lowering the degree of vacuum of the suction box is required to reduce friction between the papermaking fabric and the suction box, and as a result, a situation such as adversely affecting dewatering occurs.

[0004] In a papermaking fabric having a warp extending in the same direction as the net making travel direction of a papermaking machine, the weft is generally more convex than the warp so as to be of a weft wear type. For this reason, the conventional method of coping with an increase in the power load is to reduce the number of weft yarns on the running surface side (the surface in contact with the suction member of the paper machine) per unit length of the papermaking fabric and to reduce the diameter of the weft yarn. Met. However, this measure impaired rigidity and posture stability, and also reduced wear resistance.

There is a papermaking fabric in which the number of the weft yarns is two to one on the running surface side relative to the papermaking surface side. This is a double weave in which the papermaking side is a flat structure, the running side is a five-sheet satin weave, and both are united with binding yarns. The number of warp yarns per unit width is the same on the papermaking surface side and the running surface side, and the ratio of the number of weft yarns is 2: 1 for the papermaking surface side and the running surface side. Although there is a one-to-one type, the two-to-one type has a smaller number of wefts on the running surface side, so it is difficult to increase the power load of the paper machine, but the problem of the increase in the power load still occurs. Sometimes.

[0006]

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to reduce an increase in power load by reducing the resistance of a running surface during running of a papermaking fabric.

[0007]

The present invention is a double woven fabric in which a single woven fabric having a flat structure on the papermaking side and five oblique weaves on the running surface side is united with a binding yarn. The number of the five oblique weaves was 3/2. In the double woven fabric, the number of warp yarns per unit width is the same on the papermaking side and the running side, and the number of wefts is such that the ratio of the papermaking side to the running side is either 1: 1 or 2: 1. did.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the papermaking fabric 1 of the present invention will be described below with reference to FIGS. In the papermaking fabric 1 according to the first embodiment of the present invention, two fabrics in which the papermaking side fabric 2 is a plain fabric and the running surface side fabric 3 is a 3/2 five-layer oblique weave are stacked. In the state shown in FIG. 1A, a binding yarn Bi (including binding yarn) is integrated with a binding yarn Bi.
1B shows a design diagram of the running surface side fabric 3 (including the binding yarn), and FIG. 2A shows a paper making surface side fabric 2 and a running surface side fabric 3.
Is a design diagram of the papermaking fabric 1 of the present invention in which the papermaking fabric 1 is integrated with a binding yarn Bi, FIG. 2B shows the papermaking fabric 1 of the present invention, and FIG.
2 shows a cross section taken along line BB of FIG.

The papermaking side fabric 2 is formed of warps Wa1 to Wa19.
And the weft yarns Wf1 to Wf19 constitute a plain weave of one circulation, and the running surface side fabric 3 has warp yarns Wa2 to Wa18.
And even-numbered yarns up to Wf2, Wf6, Wf10,
The Wf14 and Wf18 form a 3/2 27 ° gentle weave that forms one circulation. This corresponds to a structure in which every other weft yarn Wf is removed from the regular oblique weave of 3/2.
The binding yarns Bi4, Bi8,... Bi20 are respectively positioned at the positions of the wefts Wf drawn every other yarn, that is, the wefts Wf2, Wf6,. The warp Wa of the papermaking surface side fabric 2 and the warp Wa of the running surface side fabric 3 are woven to make the papermaking side fabric 2 and the running surface side fabric 3 integral. The binding yarn Bi is thinner than the papermaking surface side weft.

The above-described 3/2 in the running surface side fabric 3
By replacing every other weft Wf with the binding yarn Bi in the oblique weaving, the weft of the running surface side fabric becomes half of the weft of the paper surface side fabric between the binding yarns. In the wefts constituting the texture of the fabric, odd numbers from Wf1 to Wf19 represent the papermaking side fabric 2, Wf2, Wf6, Wf10, Wf14,
Wf18 constitutes the running surface side fabric 3, Bi4, Bi8,
Bi12, Bi16 and Bi20 are binding yarns. Therefore, the number of contact points between the running surface side fabric and the paper machine is halved, which is effective in terms of frictional resistance. However, the number of weft yarns per unit width on the running surface side is abrasion resistance, rigidity and posture. From the viewpoint of stability, the ratio of the papermaking surface side to the running surface side is preferably 1: 1 rather than 2: 1.

As is apparent from FIG. 2B, the papermaking fabric 1 of the present invention has a running surface side fabric 3 which is in contact with a papermaking machine, and has a thickness of 3 /
2 and the weft Wf appearing on the running surface side at the point where the weft yarns intersect always has two yarns. In this portion, the weft Wf is pulled up by the two aligned warps Wa.

Next, a second embodiment of the papermaking fabric 1 'of the present invention will be described with reference to FIGS. The papermaking fabric 1 'according to the second embodiment of the present invention comprises two fabrics in which the papermaking surface side fabric 2' is a plain fabric and the running surface side fabric 3 'is a 3/2 five-layer oblique weave. 3 are integrated with a binding yarn Bi in a state where they are piled up, and FIG. 3 shows the papermaking side fabric 2 ′ (including the binding yarn).
4 shows a design diagram of the running surface side fabric 3 '(including the binding yarn), and FIG. 5A shows the paper making surface side fabric 2' and the running surface side fabric 3 '.
'Of the present invention in a state where the' is integrated with a binding yarn Bi.
FIG. 2B shows a cross section of the papermaking fabric 1 ′ of the present invention cut along the line BB in FIG. 5A.

[0013] The papermaking side fabric 2 'is formed of warps Wa1 to Wa.
Odd number yarns up to 19 and weft yarns Wf1,3,6,8,1
0,12,15,17,19,21,24,26,2
A plain weave is formed by the respective warp yarns with the 8, 30, 33, 35, 37, 39, 42, and 44 yarns, and the running surface side fabric 3 'is composed of even-numbered yarns from the warp Wa2 to Wa20. ,
Weft yarn Wf2,4,7,9,11,13,16,18,2
0,22,25,27,29,31,34,36,3
The 8, 40, 43, 45, and number yarns form a 3/2 27 ° gentle weave. This corresponds to a structure in which two wefts Wf out of three wefts Wf are removed from a regular 3/2 regular oblique weave. Then, for the four remaining wefts Wf, 1
Binding yarns Bi5, Bi14,... Bi41 in the ratio of books
And the binding yarn Bi is used as the weft yarn and the papermaking side fabric 2 ′
And the warp Wa of the running surface side fabric 3 'are woven.
The papermaking surface side fabric 2 'and the running surface side fabric 3' are integrated.

The binding yarn Bi is thinner than the weft on the papermaking side. By eliminating two of the three wefts Wf in the 3/2 oblique weave in the running surface side fabric 3 described above, the number of the wefts of the running surface side fabric and the number of the wefts of the papermaking surface side fabric are the same between the binding yarns. Therefore, from the viewpoint of abrasion resistance, rigidity, and posture stability, it is more preferable than the papermaking fabric of the first embodiment.
The first embodiment is more preferable in terms of frictional resistance.

As shown in FIG. 5B, in the papermaking fabric 1 'of the second embodiment, the machine contact surface of the running surface side fabric 3' is a 3/2 five-layer oblique weave, and Although two out of three wefts Wf are drawn, two warps Wa appearing on the running surface side at the point where the wefts intersect are always located in a lined-up state. As in the first embodiment, Wf is pulled up by the two aligned warps Wa.

As described in detail above, the papermaking woven fabric of the first and second embodiments has a weft W
f, the weft Wf adjacent to the two warps Wa located below
The warp Wa located below the warp Wa is also aligned, and during that time, the weft Wf projects in an arc on the running surface side of the papermaking fabric 1, but the two warps Wa are aligned. The weft W pulled up by the warp Wa
The protrusion of f on the running surface is not a gentle protrusion but a steep protrusion. The arc-shaped protruding portion 4 of the weft Wf becomes a portion in contact with a suction surface of, for example, a suction box (not shown) of the papermaking machine, but the arc-shaped protruding portion has a smaller diameter due to the pulling up by the two warps Wa. And the contact area between the weft and the suction surface of the suction box is reduced. Thereby, frictional resistance is reduced. On the other hand, even if wear occurs in the portion due to use, unlike the case where the gentle projection easily enlarges the contact surface due to the abrasion of the top portion, the extent to which the contact surface becomes large even if a certain amount of wear occurs is small, and Since the convex portion of the weft on the running surface becomes large, the abrasion volume can be maintained, and the state where the contact area with the suction surface of the paper machine is small is maintained for a long time.

[0017]

The double woven fabric for papermaking according to the present invention is a double woven fabric in which each single woven fabric having a paper-making surface side having a flat structure and a running surface side having five oblique weaves is united with a binding yarn. Since the five slanted weaves on the running surface side are reduced to 3/2, two warps of the running surface side fabric in contact with the suction surface of the paper machine come into contact with the lower surface of the weft in an aligned manner, and the weft is effectively removed. To increase the slope of the projection compared to conventional fabrics in which the weft forms a gentle projection, so that even if the projection wears out due to use, the contact area is rapidly increased. Without spreading, it is possible to reduce frictional resistance during a long-term use, and as a result, to reduce an increase in power load.

Further, in the papermaking fabric according to the present invention, the machine contact surface of the running surface side fabric 3 is a 3/2 five-layer oblique weave, and is in contact with a position where every other weft Wf of the fabric is removed. With the structure in which the binding yarn is arranged, the binding yarn can be made finer than the weft, so that many voids are generated around the binding yarn and the dewatering efficiency is improved.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the papermaking double woven fabric of the present invention, wherein A is a woven fabric (including binding yarns) on the papermaking side of the double woven fabric.
B is a design diagram of a woven fabric (including a binding yarn) on the running surface side of the double woven fabric.

FIG. 2 shows a first embodiment of the double woven fabric for papermaking of the present invention, wherein A is a design drawing when the woven fabric on the papermaking surface side and the woven fabric on the papermaking machine side are integrated by a binding yarn, Sectional drawing of the double woven fabric for papermaking of this invention cut | disconnected by the part shown by the arrow in the design drawing.

FIG. 3 shows a second embodiment of the double woven fabric for papermaking of the present invention, and the woven fabric (including binding yarn) on the papermaking side of the double woven fabric.
Design drawing.

FIG. 4 shows a second embodiment of the double woven fabric for papermaking of the present invention, and the woven fabric (including binding yarn) on the running surface side of the double woven fabric.
Design drawing.

FIG. 5 shows a second embodiment of the papermaking double woven fabric of the present invention, wherein A is a design drawing when the woven fabric on the papermaking side and the woven fabric on the papermaking machine side are integrated with a binding yarn, and B is the above-described design. Sectional drawing of the double woven fabric for papermaking of this invention cut | disconnected by the part shown by the arrow in the design drawing.

[Explanation of symbols]

 Reference Signs List 1, 1 'papermaking fabric 2, 2' papermaking surface side fabric 3, 3 'running surface side fabric Bi binding yarn 4 projecting portion of weft Wa warp Wf weft

Claims (2)

[Claims] 1. A double woven fabric in which a single woven fabric having a flat structure on the papermaking side and a five-sided weave on the running side is united with a binding yarn, and the five-sided slant on the running side is provided. A double woven fabric for papermaking, wherein the weave is 3/2. 2. A double woven fabric in which a single woven fabric of a flat texture on the papermaking surface side and a single woven fabric of 3/2 five-story weave on the running surface side are united with binding yarns, and the warp yarns per unit width. A double woven fabric for papermaking, wherein the number of weft yarns is the same as the papermaking surface side and the running surface side, and the number of weft yarns is either 1: 1 or 2: 1 for the ratio between the papermaking surface side and the running surface side.