JPS6215394A - Double fabric for papermaking - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a double-ply fabric for paper manufacturing, and more particularly to a double-ply fabric for a paper layer forming section.

Traditionally, wire mesh was used in the paper layer forming section of paper making machines, but later most of the mesh was replaced with plastic fabrics made from polymeric materials with excellent flexibility and abrasion resistance.
Furthermore, the well-known double woven fabric, which has been used in many papermaking machines in recent years, is a woven fabric with a warp-double weft structure, in which upper and lower pairs of weft yarns are interwoven with each other. It is a woven fabric made of warp threads.

In general, the properties required for wire (i.e., the fabric for the paper layer forming part) in paper manufacturing machines are the smoothness of the paper layer forming surface and the longevity of the wire, i.e., wear resistance. There are almost no textiles that can satisfy both of these requirements at the same time, and even the well-known double-woven wire with a warp-heavy weft dual structure has not been able to completely satisfy both requirements.

In other words, if the wire is required to have smoothness, the thread diameter of the fabric must be thin, and if the wire is required to have wear resistance, the thread diameter of the fabric must be increased, which are contradictory problems.

Although Japanese Patent Publication No. 58-48679 can be found as a prior art that satisfies both of these requirements, it is not always satisfactory. Tsumashi Special Public Showa 5B-4
In No. 8679, in order to achieve smoothness of the paper layer forming surface in a warp-heavy weft double fabric, when the warp passes over the upper layer weft, only one of the upper layer wefts (including repeats) is used. ), the knuckle surface formed by the warp and the upper layer weft surface are located on the same plane, and for wear resistance, the warp knuckle surface at the weaving point of the warp and lower layer weft is located on the same plane. The KW is made of 9 wires so that it is located inside the top surface of the wear side of the weft.

However, in terms of abrasion resistance, the one described in Japanese Patent Publication No. 58-48679 is of the weft wear type, but because it uses polyester yarn (hereinafter referred to as PET yarn) for the lower weft, it cannot be used in high-quality machines, etc. Almost no effect could be expected against wear caused by fillers such as calcium carbonate.

The next abrasion resistance improvement technology is to mix threads with high abrasion resistance such as polyamide into the lower weft of the woven wire.The majority of the double woven wires currently in use have this woven structure. It has become. However, in environments with severe abrasion conditions, PET yarn and polyamide yarn (
The protrusion of the knuckles of the FA yarn (hereinafter referred to as PA yarn) is almost the same, or the PET yarn protrudes more towards the wear side, so the abrasion resistance of the FA yarn cannot be fully demonstrated, and it cannot be said to be sufficient yet. . The present invention aims to improve these problems and provide a papermaking fabric that is more abrasion resistant.

That is, the present invention is comprised of an upper layer weft, a lower layer weft arranged vertically in pairs with the upper layer weft, and a warp that connects the upper layer weft and the lower layer weft to each other, and the lower layer weft is In a double-ply fabric for papermaking containing polyester yarns and polyamide yarns in a predetermined number ratio: the top knuckles of the warp yarns and the top knuckles of the upper weft yarns are in contact with substantially the same plane; the bottom of the worn side of the polyamide weft yarns of the lower layer The first plane in contact with the knuckle is located outside the second plane in contact with the bottom knuckle of the lower layer polyester weft; It is a double-ply fabric for paper making characterized by: being located outside of the third plane in contact with the fabric.

The present invention will be explained using the drawings. FIG. 1 shows a warp-heavy weft double fabric woven with eight heddles according to the first embodiment of the present invention.
The knuckle top surface of warp 1 formed on the 0 paper layer formation side is
A plane 5 formed by the top surface of the upper layer weft 2 on the paper layer forming side
On the wear side, the lower weft 4 is made of PA yarn and comes into contact with the 1,000th plane 51 located at the lowest surface on the wear side, and then the lower weft 5I/'1 is made of PET yarn. , a third plane 53 formed by the apex on the wear side of the warp knuckle where the lower weft 3 and the warp 1 intersect is in contact with the 2,000th plane 52 on the inside of the first plane, and is located on the inside of the 2,000th plane 52. It is composed of

FIG. 2 shows a second embodiment woven with the same structure as the first embodiment.
The top surface of the knuckle of the warp 11 formed on the paper waste forming side of 1 is in contact with the plane 5a formed by the top surface of the paper layer forming side of the upper layer weft 21, and the PA weft 41 on the worn side
The diameter of the weft yarn 41 is thicker than that of the PET weft 31.
The 3000th surface 53a, which is in contact with the 2000th surface 52a on the inner side and is formed by the apex on the wear side of the warp knuckle where the weft 31 and the warp 11 intersect, is located inside the 2000th surface 52a. It is something. In the second embodiment, since the PA weft 41 has a diameter larger than that of the PET weft 31, the fabric has greater abrasion resistance.

FIG. 3 shows a third embodiment of the present invention woven with seven heddles, and the warp 12 and the upper weft 22 are woven together so that the upper weft n
The top surface of the knuckle of the warp yarn 12 formed on the paper layer forming side is in contact with the plane 5b formed by the top surface of the upper layer weft 220 on the paper layer forming side, and on the wear side, the FA weft 42 is in contact with the bottom surface of the wear side is in contact with the first plane 51b located at PE
The T weft 32 has a 2,000th plane 52 inside the first plane 51b.
A third plane 53b formed by the apex of the wear side of the knuckle where the weft 32 and the warp 12 intersect is located inside the 2,000th plane 52b.

In any case of the first, second, and third embodiments,
The first plane 51.51a, 51b is the second plane 52.52a
, 52b, 52b, p(LO1+s~01) are desirably arranged on the outside (that is, on the wear side) from the viewpoint of wear resistance.

The fabric of the present invention uses yarns with high tensile strength and low elongation, such as aaK, yarns with a temporary elongation of 5% or less, for the warp and upper weft, or uses PET as the PA yarn for the lower weft. The structure of the present invention is made possible by using threads that are more extensible than threads and have a higher heat shrinkage rate.

According to the invention, first during use, the ta1 plane 51.51a,
Since the polyamide yarn constituting 51b absorbs wear, it is possible to secure a service life 1.5 to 1.7 times longer than that of the conventional prior art double-woven wire that does not interweave polyamide of the weft wear type.

In addition, by arranging the PA yarn on the first plane, it goes without saying that the abrasion resistance is improved, but PA yarn has the advantage that the fluffing of the worn surface during use of the fabric is extremely small compared to PET yarn. , which prevents the phenomenon of deterioration of the water resistance of the fabric during use, and is very effective.

The present invention is not limited to the examples described with respect to the above-mentioned drawings,
It can be applied to other double-ply fabrics woven with various numbers of heddles. Further, the ratio of PA and PET in the lower layer weft can be set to 2:1.5:1, etc., in addition to the ratio of 1=1 in the embodiment. Furthermore, the material of PA monofilament has 6
Nylon, 66 nylon, 610 nylon, etc. can be used.

As described above, the present invention provides a nine-woven fabric that significantly improves the abrasion resistance of the fabric while ensuring the smoothness of the surface on which the paper layer is formed.

4. Brief explanation of the figure FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a second embodiment of the invention.

FIG. 3 is a longitudinal sectional view showing a third embodiment of the present invention.

Claims (1)

[Scope of Claims] 1. The lower layer weft is composed of an upper layer weft, a lower layer weft arranged vertically in pairs with the upper layer weft, and a warp that connects the upper layer weft and the lower layer weft to each other, In a double-ply fabric for papermaking in which the weft yarns include polyester yarns and polyamide yarns in a predetermined number ratio: the top knuckles of the warp yarns and the top knuckles of the upper weft yarns are in contact with substantially the same plane; abrasion of the polyamide weft yarns of the lower layer The first plane in contact with the side bottom knuckle is located outside the second plane in contact with the bottom knuckle of the lower polyester weft; the second plane is located at the bottom of the warp formed in the woven part of the lower weft and warp A double-ply fabric for paper making, characterized in that the fabric is located outside the third plane that contacts the knuckle. 2. The first plane is 0.01 to 0.1 mm from the second plane.
The double-ply fabric for papermaking according to claim 1, characterized in that the double-ply fabric for papermaking is located outside by a dimension within the range of . 3. Paper manufacturing according to claim 4 or 2, characterized in that, during use of the woven fabric, the warp threads extend in the running direction of the woven fabric, and the weft threads extend in the width direction of the machine. Double woven fabric.