JP2678611B2 - Needle felt for papermaking - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a papermaking needlefelt, and particularly to a papermaking needlefelt suitable for use in a pressing process of a material such as pulp that requires a large amount of dehydration.

[Conventional technology]

Needle felt for papermaking, which is used in the pressing process of materials containing a large amount of water such as pulp, has recently been required to use a base fabric made of a thick and hard multi-woven fabric due to high-speed operation to improve productivity. Is increasing. This is to improve wear resistance and dehydration property during high-speed operation, and to facilitate loading on the paper machine by the open-end type construction in which both end edges of the base fabric are seamed. That is, a hard and thick abrasion-resistant monofilament is constructed as a base fabric by a multiple weave having a large void volume (void), and one or more seam loops are provided at both end edges of the base fabric, and a core wire is passed through the loop to form the base fabric. It is configured so that it can be connected on the paper machine.

[Problems to be solved by the invention]

The conventional base cloth described above requires a powerful and large-scale facility called a super heavy loom to make a thick and hard monofilament into a multi-weave structure.

It is desirable that the front surface of the base cloth has a dense structure and the back surface has a sparse structure with high abrasion resistance and dehydration property, but it is difficult to form such a complicated structure structure with one woven cloth.

Even if the seam loop has two or more stages, the seam strength cannot be improved because the number of loops that can be taken from the same base fabric does not change.

 There was a problem such as.

This invention is to solve the above problems, and is made of a woven fabric excellent in abrasion resistance and dehydration, and further, a needlemaking felt for papermaking provided with a base fabric capable of obtaining high seam strength and good transferability. It is intended to be provided.

[Means for solving the problem]

In order to achieve the above object, the present invention provides an open-ended paper needle felt made by needling a bat on a base fabric, the base fabric having seam loops at both end edges, and engaging the loops. A plain weave made by stacking two or more woven fabrics with a simple structure that can be seamed endlessly by inserting a core wire into the common hole made by A needle felt having a strength equal to or higher than that of a base fabric made of a woven fabric having a multiple woven structure is obtained by using a base fabric formed by stacking a simple structure woven fabric which is relatively easy to manufacture and inexpensive, and moreover, By forming a loop for seam on each woven fabric, the tension is dispersed, it can withstand high tension sufficiently, it is inexpensive and has a long service life, and it can be expected to reduce press marks.

〔Example〕

Hereinafter, the present invention will be described based on an embodiment shown in the accompanying drawings.

FIG. 1 is a sectional view showing a first embodiment of a papermaking needle felt according to the present invention, FIG. 2 is a sectional view showing the same second embodiment, and FIG. It is explanatory drawing of the Example to do.

In the figure, reference numeral 1 is a needle felt main body for papermaking, which is composed of a base cloth 2 and a bat 3 as main constituent elements. The base fabric 2 is composed of two or more simple-tissue woven fabrics and has an open end. In this embodiment, an example in which the base fabric 2 is composed of two woven fabrics 4 and 5 is shown. The woven cloth 4 constitutes the upper cloth on the upper surface side (the side in contact with the pulp) of the base cloth 2, and is composed of a plain weave cloth such as a monofilament plain woven cloth. It has a dense structure that reduces the effect on it. The woven cloth 5 constitutes a lower cloth of the lower surface side of the base cloth 2 (the side in contact with the roll of the paper machine), and like the woven cloth 4, it is a plain weave cloth such as a plain weave using monofilament. The thickness of the filament is the same as or thicker than that of the woven cloth 4, and the tissue density is the same or more sparse. That is, woven cloth 5 is woven cloth 4 for strength and wear resistance.
Is at least equal to or better than
Is at least equal to or better than. By overlapping the woven fabrics 4 and 5, the void volume of the base fabric 2 is improved by about 30% as compared with the conventional base fabric, and may be further improved depending on the combination of the upper fabric and the lower fabric. it can.

Reference numeral 6 denotes a connecting portion, and the connecting portion 6 connects the woven cloth 4 and the woven cloth 5 in the vicinity of both end edges by stitching so that both the woven cloths 4 and 5 are not displaced during the felt production or the operation of the paper machine. It has become.
The knotting by stitching is a known method of forming seam loops at both edges of the woven fabric after weaving, in addition to sewing with a sewing machine, etc. There is a pin seam method in which a seam loop is formed by pulling out and exposing it in the longitudinal direction. In the pin seam making operation, one of the two woven fabrics 4 and 5 to be overlapped as shown in FIG. This also includes a case where a yarn in the longitudinal direction of the woven fabric is partially sewn into a yarn in the transverse direction of the other woven fabric to be knotted.

Reference numerals 7 and 8 are seam loops, and the loops 7 and 8 are arranged in rows at both end edges of the woven fabrics 4 and 5, respectively. Since the number of loops in each of the loops 7 and 8 is the same as the number of loops in the case where the conventional base fabric is formed in a single stage, the total number of loops in this embodiment is twice that of the conventional one, and of course, , Its seam strength is also twice as high as before. Then, on the paper machine, the two edges of the base cloth 2 are brought close to each other, and the loop 7,
The base fabric 2 is configured as an endless belt by aligning the centers of 8 and inserting a core wire (not shown). Also, the insertion time of the core wire is longer than that of the one-step loop,
After the insertion of the first loop is completed, the second and subsequent stages can be easily inserted, so that the time required for insertion is not increased so much.

FIG. 2 shows an example in which the seam positions of the woven cloths 4 and 5 do not overlap each other. The loops 7 at both end edges of the woven cloth 4 and the loops 8 at both end edges of the woven cloth 5 are several cm to several tens of each other. It is provided at a distance of cm. Thereby, the hardness change and the gap change of the seam portion of the base fabric 2 can be suppressed, and the transferability of the seam portion to the paper (pulp) surface at the time of pressing can be reduced. In this case, it goes without saying that the position of the connecting portion 6 is appropriately changed.

The bat 3 is made of innumerable short fibers and is needling-bonded to the surface of the base fabric 2. Since the vat 3 is in direct contact with the pulp, it has a dense structure in which no marks are left on the paper (pulp) surface, and at the same time has a structure excellent in dehydration. Further, the bat 3 may be needling only to the woven cloth 4, or may be commonly needling in a state where the woven cloths 4 and 5 are stacked.

In an experiment conducted by the inventor of the present invention in February 1988, two weft double woven fabrics using monofilaments for both warp and weft were laminated to form a base fabric, and the bat was needling. The seam loop had two stages, but the insertion time was about 25 minutes, which was only 25% longer than the conventional one-stage loop. In the production of 830 g / m ² pulp, the water squeezing rate was improved by 0.5 to 1.0%, there was almost no speed reduction during papermaking, and constant production was possible.

〔The invention's effect〕

As described above, the present invention is an open-ended paper making needle felt obtained by needling a bat on a base fabric, the base fabric having seam loops at both end edges,
A simple structure in which an endless seam can be formed by inserting a core wire into a common hole formed by meshing the loops 2
Since it is characterized in that a plurality of woven fabrics are stacked and the vicinity of both end edges of the woven fabric is joined by stitching, a plain weave fabric such as plain weave is relatively easy to manufacture and inexpensive It is possible to construct a base fabric having a strength equal to or higher than that. Further, it is possible to appropriately combine woven fabrics having different characteristics, such as a woven fabric having a dense structure suitable for a bat on the upper surface and a woven fabric having a sparse structure having excellent strength and dehydration property on the lower surface. Further, since the base fabric is composed of two or more woven fabrics, the seam loop has two or more stages, and the tension applied to the base fabric can be dispersed while withstanding twice or more the conventional tension. Therefore, the needle felt for papermaking has various excellent effects such as cost reduction, long life, reduction of press marks, and improvement of dehydration property.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a papermaking needle felt according to the present invention, FIG. 2 is a sectional view showing the same second embodiment, and FIG. It is explanatory drawing of the Example to do. 1 …… Needle felt for papermaking 2 …… Base fabric 3 …… Bat 4,5 …… Simple tissue woven fabric 6 …… Bonding part 7,8 …… Seam loop

Claims (1)

(57) [Claims] 1. An open-ended need felt for papermaking, in which a vat is needling to a base cloth, the base cloth having seam loops at both end edges, and a common hole formed by meshing the loops. Needle felt for papermaking, characterized in that two or more woven fabrics having a simple structure capable of endlessly seaming by inserting a core wire are overlapped, and the vicinity of both end edges of the woven fabric is joined by stitching. .