JPS62141192A - Papermaking double fabric - 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 paper layer forming parts.

Traditionally, wire mesh was used in the paper layer forming section of papermaking machines, but later most of the meshes were replaced with plastic fabrics made of polymeric materials with excellent flexibility and wear resistance, and in recent years, many papermaking machines have been using wire mesh. The well-known double woven fabric used in the industry is a woven fabric with a warp-heavy weft double structure, and is generally formed of a pair of upper and lower wefts and a warp that is interwoven with the pair of upper and lower wefts. be.

In general, the properties required of wire (i.e., woven fabric for the paper layer forming part) in paper manufacturing machines are smoothness of the paper layer forming surface and the life span of the wire, i.e., abrasion 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 becomes thin, and if the wire is required to have abrasion resistance, the thread diameter of the fabric must be increased, which are contradictory problems.

As a prior art that satisfies both of these requirements,
Special Publication No. 58-48679 can be found, but they are not always satisfactory. In Tsumashi, Special Publication No. 58-48679, 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 weft is used. (including repetition)
In a weaving structure in which the warp intersects with the upper weft, the knuckle surface formed by the warp and the upper weft are located on the same plane; This is a wire configured to be located inside the side top surface.

However, although the one described in Japanese Patent Publication No. 58-48679 has weft wear type in terms of abrasion resistance, it uses polyester yarn (hereinafter referred to as PET yarn) for the lower layer weft.
Almost no effect could be expected on wear caused by fillers such as calcium carbonate in high-quality machines.

The next technology to improve abrasion resistance is to mix yarns with high abrasion resistance such as polyamide into the lower weft of the double-woven wire, and the majority of the double-woven wires currently in use have this woven structure. It has become.

However, in environments with severe abrasion conditions, the protrusion of the knuckles of PET yarn and polyamide yarn (hereinafter referred to as PA yarn) is almost the same, or the PET yarn protrudes toward the abrasion side, so the abrasion resistance of PA yarn is However, it has not yet been fully demonstrated and cannot be said to be sufficient. The present invention aims to solve these problems and provide a paper-making fabric that has abrasion resistance. That is, the present invention comprises: an upper layer weft 2; a lower layer weft 3 arranged vertically above and below the upper layer weft 3; an upper layer warp 1 that mutually connects the upper layer weft 2 and the lower layer weft 3; and a lower layer weft. 3 and a lower layer warp 4 made of polyamide resin; In a papermaking double-ply fabric having a double warp/weft structure consisting of: is at least 10 times the number of intersections that intersect on the upper side of the lower weft 3' (as the abrasion resistance will significantly decrease if the number is less than 1); The above-mentioned object is achieved by a double-ply fabric for paper making, which is characterized by: passing over the upper layer wefts 2 that intersect at the upper side and the upper layer wefts 2 that are vertically opposed to each other;

According to the present invention, the lower layer warp 4 made of abrasion-resistant polyamide absorbs wear at the time of use, and furthermore, the lower layer warp 4
Since it has a woven structure in which the rear lower weft absorbs wear after wear, it has significantly superior wear resistance compared to the conventional well-known double woven wire, and has been able to extend the life of the woven fabric. In addition, by making the density distribution of the lower warp yarns 4 in the machine width direction between 30 and 120% from both ends of the fabric 92 to 3 times that of other parts, extreme It is possible to prevent the phenomenon of abrasion and delay the progression of wear at the relevant locations, making the life of the fabric even longer than that of conventional fabrics.

Next, embodiments of the present invention will be described using the drawings.

FIG. 1 shows the first part of a fabric composed of eight shafts according to the present invention.
FIG. 2 is a cross-sectional view showing an embodiment of the invention, and FIG.
4 and 4 are plan views showing the shapes of the weaving patterns on the paper layer forming side and the wear side according to the first embodiment. 1st
In this embodiment, when the lower warp yarn 4 passes between the weft yarn 2 and the weft yarn 3' from under the weft yarn 3 and comes out under the weft yarn 5 again, it is woven with only one of the weft yarns 3' and every seven weft yarns. shi, lower layer warp 4
The warp density is one-seventh that of the upper layer warp 1. The upper layer weft 2 and the upper layer warp 1 that constitute the paper layer forming surface are made of thin diameter threads, and the lower layer warp 4 has a diameter larger than that of the upper layer warp 1, preferably 1.05 to 1.05 of the diameter of the upper layer warp 1.
It is possible to configure the wear surface with a diameter 1.5 times larger and improve wear resistance. If the diameter of the lower layer warp 4 is less than 1.05 times the diameter of the upper layer warp 1, the wear resistance of the wire will be poor.
, if it exceeds 1.5 times, the knuckle of the warp 4 at the weaving point of the lower warp 4 and the lower weft 3 pushes up the woven part of the upper warp 1 and the upper weft 2, which adversely affects the paper layer forming surface. It will have a negative impact.

FIG. 5 is a longitudinal cross-sectional view of a second embodiment of the present invention constructed with a 10 shaft, and FIG. 6 is a cross-sectional view taken along line 6--6 in FIG. 1 in the direction of the arrow.

7 and 8 are plan views showing the shapes of the weaving patterns on the paper layer forming side and the wear side, respectively, according to the second embodiment.

In the second embodiment, the paper waste forming surface is formed by the upper layer warp 11 and the upper layer weft 21 in a woven pattern of 8 heddles, and the worn surface is formed by the warp 41 and the lower layer weft 31 in a 16 heddle woven pattern. , the lower layer warp yarns 41 are arranged in large numbers on the wear surface, thereby further improving the wear resistance.

In the second embodiment, the pitch P1 in the warp direction at the intersection where the lower warp 41 intersects above the lower weft 31' is 2 times the pitch P2 in the warp direction at the intersection where the upper warp 41 intersects above the upper weft 21. Doubled, the pitch P, and P
The ratio of 2 is preferably in the range of 1 to 3 times, and 3
When it is more than doubled, the floating length of the lower layer warp 41 increases,
Therefore, the adhesion between the warp threads 41 and the wire body becomes poor, which adversely affects the running performance of the wire. Further, the lower warp 41 has a structure in which the weaving pattern of the worn surface formed by the lower warp 41 and the lower weft 31 is shifted by 8 healds for each warp. Further, the warp density of the lower layer warp yarns 41 is arranged at a density of 1/11016 of the upper layer warp yarns.

As described above, according to the present invention, during use, the lower layer warp 4.41 made of polyamide yarn is abraded, and furthermore, after the lower layer warp 4.41 is worn out, the lower layer weft 3 made of a mixture of polyester and polyamide is worn out. Because the holder has this, it does not affect the weave pattern on the surface on which the paper layer is formed, and it has a lifespan that is 1.7 times longer than that of conventional double-woven wire.

The density ratio of the lower warp yarns 4 to the upper warp yarns 1 is preferably 1 or less and within the range of at least a sonic multiple of the reciprocal number n of the number of healds in the upper warp yarns 1, that is, at least a double. If this ratio exceeds 1, the water resistance of the wire will deteriorate, and if it is less than 1, the wear resistance effect will be extremely reduced. In addition, the density distribution of the lower layer warp yarns 4.41 in the machine width direction is increased from 30 to 120 at both ends, where the wear of the fabric progresses faster, by increasing the red thread density by 2 to 3 times as compared to other parts. It is possible to delay the progression of wear and ensure uniform wear in the machine width direction of the fabric until the end of its use, thereby significantly extending the life of the fabric compared to conventional well-known double-ply fabrics.

If the density of the part concerned exceeds three times that of other parts, during use,
A difference occurs in the tension in the warp direction between this portion and other portions, which causes the wire ears to curl, which impedes the running of the wire.

The present invention is not limited to the example explained with reference to the above-mentioned drawings, but can be applied to double weaves woven with various other numbers of heddles. In addition, by arranging polyester and abrasion-resistant polyamide yarn in the lower weft in a ratio of 1=1.1:2.1:3, sufficient abrasion resistance can be ensured even after the lower warp 4 is worn out. It is. Further, as the material of the polyamide monofilament of the lower warp 4 or the lower weft 3, nylon 6, nylon 66, nylon 610, etc. can be used.

As described above, the present invention provides a woven fabric that has significantly improved abrasion resistance while ensuring the original pattern of the woven fabric on the surface on which the paper layer is formed and the smoothness of the woven fabric.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line 2--2 in FIG. 1 in the direction of the arrow. FIG. 3 is a top plan view of FIG. 1, and FIG. 4 is a back view. FIG. 5 is a longitudinal sectional view showing a second embodiment of the invention. FIG. 6 is a cross-sectional view taken along line 6--6 in FIG. 5 in the direction of the arrow. FIG. 7 is a top plan view of FIG. 5, and FIG. 8 is a back view.

Claims (1)

[Scope of Claims] 1. Upper layer weft 2; Lower layer weft 3 which is arranged above and below without pairs with upper layer weft 2; Upper layer warp 1 which mutually connects upper layer weft 2 and lower layer weft 3. In a papermaking double-ply fabric with a double warp and double weft structure, the lower warp 4 is interwoven only with the lower weft 3 and is made of polyamide resin; The lower warp 4 intersects below the lower weft 3. The number of intersections is 7/3 times or more the number of intersections that intersect above the lower weft 3'; the upper warp 1 vertically faces the intersection where the lower warp 4 intersects above the lower weft 3' A double-ply fabric for papermaking characterized by passing over the upper layer weft 2. 2. The pitch P_1 in the warp direction at the intersection where the lower warp 4 intersects above the lower weft 3' is the pitch P_2 in the warp direction at the intersection where the upper warp 1 intersects above the upper weft 2.
The double-ply fabric for papermaking according to claim 1, characterized in that it is woven within a range of 1 to 3 times as much as . 3. The density ratio of the lower layer warp 4 to the upper layer warp 1 is 1
Claims 1 or 2 are as follows, and are within the range of 1/5 times or more, that is, 1/(5n) times or more of the reciprocal 1/n of the number n of healds of the upper layer warp 1. The double-ply fabric for papermaking described in 2. 4. The density distribution of the lower warp yarns 4 in the machine width direction is
Claims 1, 2 or 2, characterized in that the density distribution is such that the density between 30 and 120 mm from the edges of both edges of the fabric is two to three times the density of the remaining portion. The double-ply fabric for papermaking according to item 3. 5. The diameter of the lower layer warp 4 is 1.0 of the diameter of the upper layer warp 1.
The double-ply fabric for papermaking according to any one of claims 1 to 4, characterized in that it is within a range of 5 to 1.5 times.