JP2009041161A - Seamed press felt for papermaking, which has multilayered base fabric structure, and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a single seamed felt, even in the case of using a base fabric of a multilayered structure, excellent in wet paper surface-smoothing property, having a good bat-fixing property, and having no projection of warp yarns and loosening of warp yarns at a seam part of a layered base cloth. <P>SOLUTION: This seamed press felt for the papermaking, which includes a woven base material having seam loops at both ends and a bat layer, the base material is constituted by a first base fabric obtained by joining to the seam loops through a core wire in an endless form and at least one sheet of a second base fabric obtained by joining to the seam loops through the core wire in the endless form at both ends only during a felt processing and by arranging the bat layer on the wet paper side of the base material to be entangled and pasted, and also the bat layer is cut in the vicinity of the seam loops of the second base fabric in width direction and joined only to the seam loops of the first base cloth through a core wire on the papermaking machine. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a seam-made press felt with a multi-layer base fabric structure in a felt used in a press part of a paper machine and a method for producing the same.

  In recent years, as a felt used for a press part of a paper machine, a thick and hard multilayered base fabric has come to be used in accordance with a high-speed operation for improving productivity. This improves the wear resistance and dewaterability during high-speed operation, and facilitates the operation of putting it into the paper machine with an open-end configuration that seams both edges of the base fabric.

  A conventional felt with a seam has seam loops at both ends, and the seam loops are passed between rolls of a paper machine and then meshed with each other. Yes. By making the base fabric a multi-layer structure, it is possible to obtain a felt with a seam that has a higher void volume than a felt with a seam of a single base fabric. It became possible to handle high parts.

  Such a felted seam is made of a base fabric having seam loops joined endlessly through a core wire, which is used as a lower fabric, and an upper fabric made of a base fabric having no seam loops on its outer periphery. One or several cloths are stacked, and the upper cloth and the lower cloth are bonded together by placing a bat raw material on the outer periphery of the upper cloth and needling, and then the seam loop portion of the lower cloth or the vicinity thereof The upper cloth was cut in the width direction to form an end.

  However, when the upper cloth is cut in the width direction, there is a problem that warp yarns constituting the base cloth are popped out at the cut portion, or the wefts of the upper cloth are unwound from the end portion. The presence or absence of such thread jumping and unwinding on the felt surface can cause wet paper to be stamped (marked), perforated, and even lead to paper breakage, paper quality, and operation. It was a cause of adversely affecting the surface.

In order to solve the above problem, measures have been taken in the prior art to prevent the yarn from jumping out or coming off at the cut portion of the upper cloth that has been cut.
In Patent Literature 1 and Patent Literature 2, a hot-melt fiber yarn (low melting point material yarn) is used as a yarn constituting the upper cloth, and the intersections are bonded to each other (see Patent Literature 1 and FIG. 5). Further, the number of wefts in the lowermost layer (on the side of the anti-wet paper) of the base fabric is larger than that of the warp (Patent Document 3), the non-weft area is formed in the cut part (Patent Document 4), and the seam loop A technique has been proposed in which a base fabric having a multi-layer (at least two layers) and the seam portion are offset so as not to cut the base fabric (that is, do not cut the weft) (Patent Document 5).

  Although these measures can provide a certain degree of prevention against the jumping and unraveling of the yarn, it has been insufficient under severe conditions. In the techniques described in Patent Documents 2 to 4, it is difficult to withstand severe conditions such as repeated compression in a press part of a paper machine and a change in tension before and after pressing, and the base fabric structure of the cut portion is released. Further, in the technique described in Patent Document 5, since there is a non-weft region, the sticking property of the bat in this region is poor, and there is a problem that felt hair removal and wear progress in this region is accelerated.

  In the technique described in Patent Document 5, a seam loop is also formed on the base fabric on the wet paper web contact side. Sufficient yarn strength is required to form a seam loop, and a large-diameter yarn is used. However, the surface of the base fabric woven with the large-diameter yarn becomes rough, so Since the paper surface smoothness is poor and the bat adherence is poor, it is easy to remove hair and wear easily. In addition, since a plurality of seam portions exist, the seaming workability at the time of hooking is inferior.

Japanese Patent Laid-Open No. 11-100807 JP 2003-96685 A US Pat. No. 4,863,786 Japanese Patent Laid-Open No. 2004-36020 Canadian Patent No. 2229121

  The present invention has been made in view of the above-mentioned problems, and is particularly used for felts using a thick, hard multilayered base fabric with high-speed operation, and has excellent wet paper surface smoothness and bat sticking properties. An object of the present invention is to provide a single seam felt which is good and has no warp yarn jumping and unraveling of the weft yarn in the seam portion of the laminated base fabric.

  The present invention is basically an invention related to a press felt for seamed paper making having a multilayer base fabric structure, and is based on the following technologies.

(1) A felt for papermaking with a seam comprising a base material having a plurality of base fabrics made of a woven fabric having seam loops at both ends and a bat layer,
The base material includes a first base fabric joined endlessly to the seam loop via a core wire, and a second base joined endlessly to the seam loop via the core wire at both ends only during felt processing. 1 or more of cloth, it is bonded by arranging and intertwining a bat layer on the wet paper side of the base material, and the bat layer is in the width direction in the vicinity of the seam loop portion of the second base fabric A press felt for papermaking with seam, characterized in that it is endlessly joined to only the seam loop of the first base fabric via a core wire on a papermaking machine.

(2) The press felt for seamed papermaking according to (1), wherein the basis weight of the second base fabric is smaller than the basis weight of the first base fabric.

(3) The seam according to (1) or (2), wherein a gap formed by the seam loop of the second base fabric is smaller than a gap formed by the seam loop of the first base fabric. Press felt for paper making.

(4) The loop length (2LL) and the loop height of the seam loop provided on the second base fabric (2LH), the loop length (1LL) and the loop height (1JH) of the seam loop provided on the first base fabric The press felt for papermaking with seams according to (3), characterized in that it is smaller.

(5) The void formed by the seam loop provided in the second base fabric is made small by the swelling of the multifilament yarn disposed in the vicinity of the seam loop during use (3 ) Press felt for papermaking with seams.

(6) A method for producing a felt for papermaking with a seam, comprising a woven base material having seam loops at both ends and a bat layer,
Obtaining the first base fabric composed of a woven fabric having seam loops at both ends and the second base fabric composed of a woven fabric having seam loops used only at the time of felt processing at both ends;
A step of making the first base fabric and the second base fabric endless by joining a seam loop through a core wire;
The batt layer is disposed on the wet paper web side of the base material composed of the first base fabric and the second base fabric that are endless, and the first base fabric and the second base fabric are entangled. The bonding process,
Removing the mutual seam loops of the first base fabric and the second base fabric, and making the first base fabric and the second base fabric end-like,
Cutting the wet paper web bat layer in the width direction at a position in the vicinity of the seam loop portion of the base fabric to form a felt with an end;
A method for producing a seamed paper-made press felt, characterized in that, on a papermaking machine, a core wire is inserted only into the first base fabric to make it endless.

  According to the present invention, it is possible to provide a single seam felt that has excellent wet paper web surface smoothness, good butt adherence, and has no warp yarn jumping or weft unraveling at the seam portion of the laminated base fabric.

  As the fiber material used for the yarn and bat layer constituting the base fabric of the present invention, general-purpose materials used for press felts of paper machines can be used, such as nylon, polyester, polypropylene, natural materials, etc. It is appropriately selected from fiber materials.

  The base material composed of the first base fabric and the second base fabric is bonded together by arranging a bat layer on at least the wet paper side of the base material and entangled by processing such as needling and fluid entanglement.

In addition, in this invention, it is not limited to what provides a butt layer only in the wet paper web side of a 2nd base fabric, You may provide a bat layer also in the machine side (roll side) of a 1st base fabric.
Further, even in the case where the batt layer is provided only on the wet paper side of the second base fabric, the vat fiber may penetrate the machine side of the first base fabric when needling.
Thus, when the butt layer / bat fiber is disposed on the machine side of the first base fabric, the bat fiber may be removed in the width direction in the vicinity of the seam loop (1L) of the first base fabric.

  Further, in order to reduce the gap formed by the seam loop of the second base fabric, the multifilament yarn inserted into the loop can swell when the press felt is used, and can fill the gap in the loop. Yarn is used. The yarn has an official moisture content of 4.5% or more, such as nylon, vinylon, acetate, rayon, polynosic, cupra, cotton, hemp, silk, wool, etc., has high hydrophilicity and can absorb more moisture A raw material can be used, and a multifilament made of 1500 to 1600 dtex tow is preferably used.

Next, embodiments of the present invention will be described with reference to the drawings.
The felt (1) shown in FIG. 1 includes a first base fabric (10) and a second base fabric (20) that are laminated, and a butt layer (30) that is needled together at least on the wet paper side of the second base fabric. The combined state is shown.

  The pasting was performed by butting each of the first base fabric having seam loops (1L) at both ends and the second base fabric having seam loops (2L) at both ends so as to mesh with each other. It is manufactured by joining the respective common holes endlessly through the core wires (13) and (23) and then needling with the butt layer.

  After the felt (1) is bonded, the core wires (13) and (23) are once pulled and cut in the width direction in the vicinity of the seam loop (2L) portion of the second base fabric (20) (FIG. 2). As a result, the cut portion of the bat layer can be formed on the wet paper web side without damaging the seam loop.

  The felt (1) is formed into an end by forming the cutting part (40), and the seam loop (1L) can be joined endlessly through the core wire (13) after passing between the rolls of the papermaking machine. At this time, the core wire is not inserted into the seam loop (2L) of the second base fabric (20) (FIG. 3). In this way, the felt of the present invention is completed.

  Further, by arranging multifilament yarns made of tow of 1500 to 1600 dtex as wefts in the vicinity of the loop of the second base fabric (20), the gap in the seam loop of the second base fabric is made small, and the mark property is improved. Can be improved.

  When weaving the second base fabric, the multifilament yarn is woven in the vicinity of the loop (outside the loop) with a different structure from the ground part, or after weaving using a piano wire, etc. It can arrange by inserting in.

The first base fabric and the second base fabric of the present invention are preferably woven fabrics woven by warp double weave. The basis weight of the base fabric of the present invention is such that the first base fabric is 300 to 700 g / cm ² , preferably 450 to 650 g / cm ² , and the second base fabric is 100 to 500 g / cm ² , preferably 200 to A woven fabric in the range of 400 g / cm ² can be used.

In the present invention, the gap formed by the seam loop of the first base fabric is 0.24 to 1.86 mm ³ per loop, and the gap formed by the second seam loop is 0.14 to 0 per loop. .84 mm ³ is preferable. Furthermore, in the present invention, the loop length of the seam loop provided on the first base fabric is 1.50 to 3.00 mm, the loop height is 0.50 to 1.50 mm, and the loop of the seam loop provided on the second base fabric It is preferable that the length is 1.50 to 2.50 mm and the loop height is 0.50 to 1.00 mm. These can be measured using an optical microscope.

Using the base fabric having the structure shown in Table 1, seam-made felts for papermaking of Examples 1 and 2 and Comparative Examples 1 to 3 were prepared. The materials used are as follows.
・ Base fabric material: Nylon ・ Bat material: Nylon, fineness 39dtex
・ Table bat amount: 500 g / m ²
-Back bat amount: 200 g / m ²
-Insertion yarn: 1500 dtex (manufactured by Toray Monofilament, product number 1450T-68-3158) multifilament yarn

  About the sample manufactured by Example 1, 2 and Comparative Examples 1-3, the evaluation test of the following items was done. The evaluation items employed in the present invention are the time at which the second base fabric (upper fabric) is unwound, the mark property, the hair removal amount, and the seam processing (seaming) time. The results are shown in Table 2.

<Taking time of the second base fabric (upper fabric)>
Measure the occurrence time of unraveling by high-speed, high-pressure paper machine tester test. The test conditions are as follows: paper making speed: 1000 m / min, pressure: 100 kg / cm ² , HPS: 15 kg / cm ² .

<Markability>
Evaluation is performed by a mark test using the apparatus of FIG. As a test method, felt, carbon paper, paper and bat are overlapped and pressed with a roll (pressurization: 30 kg / cm). The bat is added in units of 100 gsm. The mark index is a value of 1/1000 of the bat weight at which the base cloth mark transferred to the paper is not confirmed by visual evaluation. The smaller the mark index, the better the mark property.

<Hair loss>
Evaluation is performed by the JIS II abrasion test using the apparatus shown in FIG. The test condition is that the amount of worn fibers after 400 times is measured with an electronic balance at a sliding frequency of 30 times / minute. A sliding distance of 100 mm, a wear terminal surface of 20 × 20 mm, a wear terminal load of 500 g, and sandpaper 320 mesh are used.

<Seaming time>
Evaluation is made by the time required for seaming per meter on a plane.

  As shown in Table 2, as a result of the evaluation test, it was found that Examples 1 and 2 had very little occurrence time even if the second base fabric was not unwound. Also, the mark index value was small and the mark property was good. Furthermore, the hair removal amount was small and the hair removal resistance was also good. Furthermore, the seaming time was short, and the time required for entering the papermaking machine could be expected to be shortened.

According to the present invention, even a multi-layered base fabric is excellent in wet paper surface smoothness, has good butt adherence, and has no single warp and weft unraveling at the seam portion of the laminated base fabric. You can get seam felt.
In particular, even when using a thick, hard, multi-layer fabric that is used for high-speed operation, it has improved wet resistance and dewaterability during high-speed operation, and has excellent wet paper surface smoothness and durability. In addition, it is very useful because it is easy to perform the hang-up operation.

It is an expanded sectional view of the seam loop part before the felt is cut in the width direction in the vicinity of the seam part of the felt according to the present invention and the vicinity thereof. It is an expanded sectional view of a seam loop portion and its vicinity when the felt is cut in the width direction at or near the seam portion of the felt according to the present invention. FIG. 3 is an enlarged cross-sectional view of the seam loop portion and its vicinity after the felt is cut in the width direction in the vicinity of the seam portion of the felt according to the present invention and mounted on the papermaking machine. In the felt which concerns on this invention, it is the figure by which the multifilament yarn was arrange | positioned at the 2nd base fabric. It is a figure which shows a prior art example. It is a figure explaining a mark property test. It is a figure explaining the abrasion test used for the measurement of the amount of hair loss.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Felt 10 which concerns on this invention First base fabric layer 11 First base warp 12 First base weft 13 First base core wire 1L First base seam loop 1LL First base seam loop Loop length 1LH Loop height of seam loop of first base fabric 20 Second base fabric layer 21 Warp yarn of second base fabric 22 Weft yarn of second base fabric 2L core wire of second base fabric 2L Seam loop 2LL of second base fabric The loop length of the seam loop of the two base fabrics is 2LH. The loop height of the seam loop of the second base fabric is 30. The butt layer 40 is cut.

Claims (6)

A press felt for papermaking with a seam, comprising a woven base material having seam loops at both ends and a bat layer,
The base material includes a first base fabric joined endlessly to the seam loop via a core wire, and a second base joined endlessly to the seam loop via the core wire at both ends only during felt processing. 1 or more of cloth, it is bonded by arranging and intertwining a bat layer on the wet paper side of the base material, and the bat layer is in the width direction in the vicinity of the seam loop portion of the second base fabric A press felt for seamed papermaking, characterized in that it is endlessly joined to only the seam loop of the first base fabric via a core wire on a papermaking machine.   The press felt for seamed papermaking according to claim 1, wherein the basis weight of the second base fabric is smaller than the basis weight of the first base fabric.   The press felt for seamed papermaking according to claim 1 or 2, wherein a gap formed by the seam loop of the second base fabric is smaller than a gap formed by the seam loop of the first base fabric. .   The seam loop according to claim 3, wherein a loop length and a loop height of the seam loop provided on the second base fabric are smaller than a loop length and a loop height of the seam loop provided on the first base fabric. Press felt for paper making.   The void formed by the seam loop provided in the second base fabric is made small by the swelling of the multifilament yarn disposed in the vicinity of the seam loop during use. Paper felt with seams. A method for producing a press felt for paper making with seam, comprising a woven base material having seam loops at both ends and a batt layer,
Obtaining the first base fabric composed of a woven fabric having seam loops at both ends and the second base fabric composed of a woven fabric having seam loops used only at the time of felt processing at both ends;
A step of making the first base fabric and the second base fabric endless by joining a seam loop through a core wire;
The batt layer is disposed on the wet paper web side of the base material composed of the first base fabric and the second base fabric that are endless, and the first base fabric and the second base fabric are entangled. The bonding process,
Removing the mutual seam loops of the first base fabric and the second base fabric, and making the first base fabric and the second base fabric end-like,
Cutting the wet paper web bat layer in the width direction at a position in the vicinity of the seam loop portion of the base fabric to form a felt with an end;
A method for producing a seamed paper-made press felt, characterized in that, on a papermaking machine, a core wire is inserted only into the first base fabric to make it endless.