JP2609134B2 - Double woven fabric for papermaking - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a papermaking fabric.

[Prior Art] There is a greater demand for papermaking fabrics than before. Broadly speaking, (a) prevention of wire marks, sufficient entanglement of paper fibers, problems with paper quality itself or problems with papermaking yield, (b) improvement of abrasion resistance, extension of the service life of textiles, C) Good aqueous problems. Although the problems are often related to each other, roughly speaking, the problem (a) is mainly related to the structure of the papermaking surface of the fabric, and the problem (b) is related to the structure of the running surface of the fabric. The relationship is deep, and (c) is a problem with the whole fabric.

Such a problem is a problem that must be solved not only for a multi-woven fabric but also for a single-woven fabric.

Conventionally, many proposals have been made for the solution (a). However, the problem of (b), that is, the improvement of the wear resistance of the papermaking fabric has not been sufficiently devised, and the running side of the papermaking fabric is of a weft-wear type, and is limited to the extent of preventing warp abrasion. .

However, in recent years, various conditions such as an increase in papermaking speed, an increase in the amount of filler used, and an increase in the necessity of producing neutral papermaking have been required, and the abrasion resistance of the papermaking fabric has become a major problem.

In order to improve such abrasion resistance, it has been attempted to use abrasion-resistant polyamide as a weft on the running surface of a conventional weft-wear type papermaking fabric. Has the drawback that it is easily stretched and has poor posture stability.

Therefore, conventionally, a papermaking woven fabric which is hard to stretch and has excellent posture has been constructed by using polyester having excellent rigidity for both warp and weft.

Fig. 6 shows 16 polyester warp wefts (16
FIG. 2 is a complete design diagram showing a conventionally used double-woven papermaking fabric (shaft). In the figure, the mark ○ indicates the position where the warp weaves the weft on the running surface, and the mark x indicates the position where the warp weaves the weft on the papermaking surface. Therefore, the distance between the marks と indicates the length of the crimp of the weft on the running surface. In the conventional papermaking fabric of FIG. 6, the crimp lengths of the wefts adjacent to each other on the running surface are the same.

However, in such a conventional papermaking fabric, in order to satisfy the above-mentioned requirements, it has been attempted to use a thick warp yarn as a weft on the running side of the papermaking fabric. Although improvement can be achieved to some extent, the balance between the weft and the warp is lost because the weft is thick, and the crimping property is deteriorated, causing wire marks.

Further, as understood from the above problem (c), if the structure of the running surface changes, the water is also affected, and the problem cannot be solved by palliative means such as simply making the weft thicker.

[Problems to be Solved by the Invention] In view of the problems of the prior art as described above, the present invention has an adverse effect on the performance of papermaking such as water-based and wire mark properties of a papermaking fabric without adversely affecting the performance. It is intended to improve abrasion.

[Means for Solving the Problems] The present invention provides a complete weft double woven fabric for papermaking, in which the weft is arranged in a double up and down manner, and the lower weft is a polyester yarn. Polyamide yarns are arranged, and each warp weaves one polyamide yarn of the lower weft once or one polyester yarn on the running surface, while two adjacent upper wefts on the papermaking surface. Weaving two times at intervals of five wefts as a set, and weaving the upper layer weft by shifting three wefts sequentially on the papermaking surface side, forming a long crimp of wefts with a length of 13 warps on the running surface Papermaking double woven fabric having a perfect texture.

2.It is a complete weave consisting of 16 warps and wefts, a papermaking weft double woven fabric in which wefts are arranged vertically and doublely, and the lower wefts are arranged with polyester yarns and polyamide yarns, and each warp is on the running surface , One polyamide yarn of lower weft
Or one weave of one polyester yarn. On the other hand, on the papermaking surface, two adjacent upper wefts are woven twice at a spacing of six wefts as a set of two wefts. A double woven fabric for papermaking having a complete design in which a long crimp of wefts having a length of 15 warps is formed on the running surface, which is displaced by a distance corresponding to the length of the warp.

About.

Since the present invention forms the above structure on the running surface of the papermaking fabric, the effect on the papermaking surface is extremely small in a multi-weave papermaking fabric such as a double weave or a triple weave, and the papermaking surface is formed. There is almost no effect on the properties, and no substantial change is observed in the aqueous properties and wire mark properties.

In the present invention, since the crimp of the weft projecting to the running side is long, a thick weft can be arranged, and the wear resistance can be improved.

[Operation] The wear resistance of the running surface of the papermaking woven fabric is increased by increasing the wear volume of the weft forming the running surface. It is desirable that the weft yarn has an abrasion resistance effect in view of the stability of the posture of the woven fabric during use and the extension of the service life. This is because the warp abrasion causes a change in the dimensions of the woven fabric or a cut.

The papermaking fabric in which the wefts of the present invention are arranged in upper and lower double, by arranging, for example, every other polyester weft having excellent rigidity and a polyamide weft having excellent wear resistance on the running surface, The crimp of both wefts can be lengthened. As a result, a long crimp is formed on the running surface weft without changing the surface properties of the conventional papermaking fabric, that is, the pulp fiber supportability and the wire mark characteristics, thereby increasing the wear volume and greatly improving the wear resistance. Things.

Actually, in the knuckle portion where the warp and the weft intersect and the yarn is sharply bent, there is a weft portion that does not perform an abrasion resistance action due to its crimp shape. In other words, in the same area, the method with a small number of knuckles increases the effective wear volume from the viewpoint of wear resistance, and improves the water solubility.

Also, the crimping property, that is, an index that can press and bend the weft while overcoming the repulsive force of the weft when the warp tries to bend the weft, is the length of the crimp, that is, the distance between the warp and the warp that pushes up the weft. It becomes good when is long. When the crimping property is improved, a thicker weft can be used.

In the present invention, the crimp of the weft on the running surface of the woven fabric is longer, so that the crimping property is good, and a thicker weft that could not be used conventionally can be arranged, so that the wear volume can be further increased.

The increase in the wear volume will be specifically described in the following Examples in comparison with the conventional example.

[Embodiment] FIGS. 1 and 2 show the warp and weft of the present invention, respectively.
It is a complete design diagram showing double woven papermaking fabrics of 16 (16 shafts) and 14 (14 shafts), in which numbers without dashes indicate warp yarns and numbers with dashes indicate weft yarns.

In FIGS. 1 and 2, a circle indicates a position where the warp weaves the weft on the running surface, and a cross indicates the position where the warp weaves the weft on the papermaking surface. Therefore, the length of the crimp of the same weft forming the running surface of the papermaking fabric is shown between the circle of the complete design drawing of each figure and the circle of the next complete design drawing (not shown). I have.

In FIG. 1, the warp and the weft are respectively 16 like the conventional one in FIG. 6, and the crimp length of the weft is clearly longer than that in FIG. . That is, for example, the weft 1 '(polyester yarn) in FIG. 6 forms a crimp with the warp 7 and the warp 15, and the weft 2' (polyester yarn) forms a crimp with the warp 2 and the warp 10. There are seven warps between each of the crimps, and the weft 1 '(polyester yarn) and the weft 2' (polyamide yarn) of FIG. 1 form a crimp with a warp 16 and a warp 16, respectively. There are 15 warps between the next crimp of the complete design drawing (not shown) that repeats to the right or left.

It is obvious that the crimp length is longer in the one shown in FIG. 2 as compared with the conventional one (not shown) having the same number of shafts.

3 and 4 show a knuckle portion of a papermaking fabric. 25 to 27 are warp yarns, and 28 'is a weft projecting from the running surface. FIG. 3 shows the warp 26 passing under the weft 28 'and weaving the weft 28'. FIG. 4 shows the warp.
26 shows a state in which the weft 28 'is not woven over the weft 28'. It is clear that the hatched portions in FIGS. 3 and 4 do not exhibit wear resistance. That is, as the number of knuckles increases, the number of wefts having no abrasion resistance increases and the effective abrasion volume decreases.

FIG. 5 shows the shape of the crimp. With weft 30
31 interweaves the weft 29 'under the weft 29', but as apparent from this figure, the warps 30 and 31 push the weft 29 'upward. The warps 33 and 34 receive the repulsive force of the weft 29 ', but push down the weft 29. Also warp
32 pushes the weft 29 'downward, but its action is
Smaller than 4. The index by which the warp pushes and bends the weft by overcoming the repulsion of the weft is called crimping property. If the crimping property is good, a thicker weft can be used.

The longer the distance between the warp 30 and the warp 31, the more warp 32,33,34, ...
The greater the number of, the better the crimpability.

In this embodiment, as the warp on the running side of the woven fabric, a polyester yarn having excellent rigidity and a polyamide yarn having excellent wear resistance are arranged every other yarn, and the crimp of the weft is increased, so that the crimping property is improved. In addition, a thicker yarn can be arranged on the weft, and the wear-resistant volume can be increased.
In particular, by increasing the wear resistance or the thickness of the polyamide, the wear resistance on the running side can be further improved.

In the embodiment of FIGS. 1 and 2, the weft adjacent to the running surface is a polyester yarn and a polyamide yarn, that is, the ratio between the polyester yarn and the polyamide yarn is 1: 1. However, the present invention is not limited to these. For example, in the embodiment of the 16-shaft papermaking fabric shown in FIG. 1, three polyamide wefts may be arranged, and then one polyester weft may be arranged. Even with this arrangement, predetermined wear resistance can be realized.

In the above embodiment, both the polyester yarn and the polyamide yarn are used as the weft, but in the present invention, only one of the polyester yarn and the polyamide yarn may be used as the weft.

Thus, in this example, the effective abrasion volume on the running side of the papermaking fabric can be significantly increased as compared with the conventional fabric, and the abrasion resistance can be dramatically improved. This is illustrated in a comparative test below.

The papermaking fabric of the present invention shown in FIG.
The comparison of the abrasion resistance of the conventional papermaking fabric of the figure is shown.

First, in calculating the crimp volume of the weft to compare the wear volume, the crimp was made cylindrical between the warps. Actually, as will be described later, since there is a portion which is not related to wear existing above the bent portion of the weft or the warp, the wear volume is smaller in the conventional example.

The comparison between the present invention and the conventional example was performed by calculating for two adjacent wefts.

In the same 16-shaft papermaking double woven fabric shown in FIG. 1 and FIG. 6, two adjacent wefts are used in the conventional example of FIG. Since the warps are arranged, a crimp having a length of 7 × 4 = 28 is formed. Accordingly, the volume is 28 × 0.17 × (0.22 / 2) ² π = 0.181 mm ^{3 because the} diameter of the warp is 0.17 mm and the diameter of the weft is 0.22 mm.

Similarly, in the embodiment of the present invention shown in FIG. 1, a crimp having a length of 15 warps is formed for one weft, and the warp has a wire diameter of 0.17 mm and the polyester weft has a wire diameter of 0 mm. .
Since the diameter of the crimp is 22 mm and the wire diameter of the polyamide weft is 0.25 mm, the volume of the crimp is 14 × 0.17 (0.22 / 2) ² π + 15 × 0.17 × (0.25 / 2) ² π = 0.216 mm ³ . Therefore, the increase rate of the wear volume is (0.216 ÷ 0.181-1) × 100 = 19.3 (%) That is, even if a simple calculation is performed, the wear volume is large by about 20% in the embodiment of the present invention.

The crimp length of the running surface of the conventional example in FIG. 6 is 1.105 mm according to actual measurement, and 2.28 m in the embodiment of the present invention in FIG.
m.

 The results of the comparative test are shown in Table 1 below.

Next, the papermaking fabric shown in FIG. 1 of JP-A-57-89696 (Comparative Example 1) and the papermaking fabric shown in FIG. 5 of JP-A-62-276097 (Comparative Example 2) )) And the results of the tests actually used for papermaking on the performance of the papermaking fabric of the embodiment of FIG. 1 of the present invention are shown in Table 2.

Test method: The test was carried out using an abrasion tester manufactured by Japan Filcon (utility model registration No. 1350124) and using heavy calcium carbonate as a filler.

Test results: As shown in Table 1, the time required for the lower weft to wear and cut (wire life) was about 1.5 times that of the product of the present invention as compared with the conventional product.

(Effect)

As described above, the papermaking woven fabric of the present invention uses both a polyester yarn and a polyamide yarn as the weft forming the running surface. The abrasion resistance could be drastically improved without any adverse effect and without impairing the rigidity of the woven fabric.

[Brief description of the drawings]

FIG. 1 and FIG. 2 show an embodiment of the present invention, in which a double-woven papermaking fabric of a complete design comprising 16 (16 shafts) and 14 (14 shafts) warps and wefts, respectively. FIG. 3 and 4 show the knuckle portion of the papermaking fabric, and FIG. 5 shows the shape of the crimp. FIG. 6 is a complete design diagram of a conventional double woven fabric for papermaking, which is composed of 16 (16 shafts) each of a warp and a weft in a conventional example. DESCRIPTION OF SYMBOLS 1 to 16: warp, 1 'to 16': weft.

Claims (2)

(57) [Claims] 1. A weft double woven fabric for papermaking, comprising a total of 14 warps and wefts, in which the wefts are arranged vertically and doublely, wherein the lower wefts are polyester yarns and polyamide yarns. On the running surface, one polyamide yarn of the lower weft is woven once or one polyester yarn is woven once, while on the papermaking surface, two sets of adjacent upper wefts are formed at intervals of 5 wefts. A papermaking machine having a complete design in which a long crimp of 13 wefts is formed on the running surface, with the positions for weaving and weaving the upper weft being sequentially shifted by three wefts on the papermaking side. Heavy fabric. 2. A weft double woven fabric for papermaking, comprising a total of 16 warps and wefts, in which the wefts are arranged vertically and doublely, wherein the lower wefts are polyester yarns and polyamide yarns. In the running surface, one polyamide yarn of the lower weft is woven once or one polyester yarn is woven once. On the other hand, in the papermaking surface, two adjacent upper wefts are paired at intervals of 6 wefts. A papermaking machine having a complete design in which a long crimp of fifteen warps is formed on a running surface, wherein the positions for weaving and weaving the upper weft are sequentially shifted by three wefts on the papermaking side. Heavy fabric.