JPH04361682A - Endless woven fabric for concentrating paper material such as waste paper and its production - Google Patents

Abstract

PURPOSE:To obtain the subject woven fabric useful for removing ink particles, ash, etc., from waste paper, etc., by filling a polyurethane resin in a space of woven fabric to form an inflexible part, welding a guide protrusion made of the same polyurethane resin to the inflexible part and integrating the polyurethane resin of the guide protrusion to that of the inflexible part. CONSTITUTION:Endless woven fabric is formed of fabric woven by a plastic monofilament. A polyurethane resin sheet having a width of 30-50 mm and a thickness of 1-1.5 mm is placed on at least one side of the moving face at the selvedge of the endless fabric in the direction of width. The sheet is hot- pressed to fill >=85% of the space in the woven fabric with the polyurethane resin to form an inflexible part of 30-50mm wide. A guide protrusion made of the same polyurethane resin is welded to a surface of the inflexible part and integrated with the polyurethane resin of the inflexible part to obtain the objective endless woven fabric for the concentration of paper material such as waste paper.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concentrated endless woven fabric for removing ink particles, ash, etc. from an aqueous solution of a paper material recycled from waste paper such as newspaper by deinking, deashing, etc., and a method for manufacturing the same.

0002

2. Description of the Related Art A conventionally known endless fabric for concentration is, for example, the one disclosed in Japanese Patent Application Laid-Open No. 2-14090, in which projections are sewn to both ends in the width direction of the fabric.

0003

[Problem to be solved by the invention] Concentration of paper materials such as waste paper after dissolution is different from paper manufacturing, and the dissolved material is not uniformly supplied onto the fabric in small amounts, but the solid content is dispersed unevenly. It is released in a state that As a result, a large load is applied unevenly to the woven fabric, causing the rotating endless woven fabric to travel diagonally and sometimes come off the inner roll. In order to prevent this phenomenon, an attempt was made to provide a groove in the inner roll and provide guide protrusions that fit into the grooves at both ends of the fabric in the width direction, but the fabric was It breaks off in a short time while driving. Cutting also occurs when the inner roll is not provided with a fitting groove and the side surface of the guide protrusion is brought into contact with the end face of the inner roll to prevent skewing. In the prior art disclosed in Japanese Unexamined Patent Publication No. 2-14090, guide protrusions are sewn onto the fabric to prevent this cutting. Fixing by suture is different from fusion bonding because there is play between the protrusions and the fabric, so cutting of the fabric is considerably alleviated. However, cutting cannot be completely prevented, and there is a drawback that guiding performance deteriorates. The present invention solves the above-mentioned drawbacks and provides a fabric having good guiding properties and cut-resistant strength, and provides a method for concentrating paper materials such as waste paper using this fabric.

0004

[Means for Solving the Problems] The present invention provides: ``1. An endless fabric formed of a fabric woven from plastic monofilament, and a polyurethane resin disposed at at least one end of the edge in the width direction of the endless fabric. An anti-bending portion with a width of 30 to 50 mm that fills 85% or more of the space of the fabric and is contained within the structure of the fabric, and is provided on one surface of the anti-bending portion by being integrally fused and bonded with the filled polyurethane resin. An endless woven fabric for concentrating paper materials such as waste paper, comprising guide protrusions molded from polyurethane resin. described,
Endless fabric for concentrating paper materials such as waste paper. 3. The endless woven fabric for concentrating paper materials such as waste paper according to claim 2 or 3, wherein the guide projections are projections molded using the same polyurethane resin as the polyurethane resin of the anti-bending portion. 4. A polyurethane resin sheet with a width of 30 to 50 mm and a thickness of 1 to 1.5 mm is placed on the running surface of at least one end of the edge in the width direction of an endless fabric made of a fabric woven with plastic monofilament and bonded by heat and pressure. Width 3 containing polyurethane resin filling 85% or more of the space of the fabric
A 0 to 50 mm anti-bending part is formed, and then a guide protrusion made of the same polyurethane resin is fused to one surface of the anti-bending part, and the guide protrusion is fused and disposed integrally with the polyurethane resin of the anti-bending part. A method for producing an endless fabric for concentrating paper materials such as waste paper. ” related. The woven fabric used in the present invention is woven using polyethylene terephthalate monofilament for the warp and polyethylene terephthalate monofilament and/or polyamide monofilament for the weft, and has a void ratio of 45% to 70% and a thickness of 0.5 mm.
~1.2mm woven fabric.

[0005]

[Function] Since woven fabrics are woven by warp and weft yarns, they are not rigid bodies, and even if finished, the entire fabric does not have uniform elongation, tensile strength, and rigidity. Therefore, when an endless fabric is rotated, the fabric moves from the side with greater elongation to the side with less elongation. Also, due to the arrangement of crimps on the running surface of the fabric, the fabric runs diagonally and shifts to one side. Furthermore, if the center of the running of the endless rotating device is insufficiently adjusted, the fabric will also drift to one side.

[0006] Skewing of the fabric occurs due to these various causes. The direction of skew is therefore determined by the respective fabric and by the endless rotating device. Therefore, if the direction of oblique movement is determined, it is sufficient to provide guide protrusions on the ears on the opposite side, but since the direction of oblique movement is usually unknown, it is preferable to arrange guide protrusions on both ears. By the way, paper materials such as waste paper are concentrated by supplying the dissolved material onto the fabric or between the fabric and an inner roll, compressing it between the fabric and the inner roll, or dewatering it by centrifugal force. Therefore, when a heavy object is placed on the fabric or between the fabric and the inner roll, the tension changes and skewing is promoted. If the skew is severe, the fabric will come off the inner roll.

[0007] Guide protrusions are provided at the ends in the width direction of the fabric,
When guided by fitting into the groove provided on the inner roll,
If the depth of the groove is approximately equal to the guide protrusion, and the fabric tries to move inward with respect to the guide protrusion, the inner surface of the guide protrusion will be the inner wall surface of the groove in the part of the fabric that is in contact with the inner roll. However, as the fabric tries to move further inward, the guide protrusion is pulled by the inner force and tries to come off the groove, causing the outside of the guide protrusion to lift and the fabric to bend near the inner surface of the guide protrusion.

On the other hand, when the fabric tries to move outwardly relative to the guide protrusion, the outer surface of the guide protrusion comes into contact with the outer wall surface of the groove in the part of the fabric that is in contact with the inner roll, but the fabric moves further outward. As the fabric tries to move, the guide protrusion is pushed outward and tries to come off the groove, causing the inner side of the guide protrusion to lift up and the fabric to be pressed against the guide protrusion and bend. Then, when it leaves the inner roll, the bend is removed. As this bending motion is repeated, the fabric is cut near the inner side surface of the guide protrusion.

[0009] If the guide protrusion is loosely fixed to the fabric and provided with play so that the guide protrusion moves a little when the fabric is pressed against the guide protrusion, the bending of the fabric will be alleviated to some extent, but cutting will be prevented. I can't do that. Moreover, if the guide protrusion is loosely fixed, the guide performance is reduced and there is a disadvantage that the guide protrusion has a greater tendency to escape from the groove of the inner roll. The protrusions may be provided at one end of the fabric in the width direction, or may be provided at both ends. Of course, the guide protrusion may be guided by contacting the end surface of the inner roll. In this case, it is preferable to arrange the guide projections at both ends in the width direction of the fabric. In this case, when the fabric is stretched, since the guide protrusions are not directly stretched over the inner roll, no tension is directly applied to the guide protrusions, and the tension is lower than that of the fabric. Therefore, in the portion of the fabric that is in contact with the inner roll, the guide protrusion is bent at the end face of the inner roll in the direction of the central axis of the inner roll. Therefore, the fabric bends near the inner surface of the guide protrusion. When separated from the inner roll, the bending is relaxed to a gentle degree. When this bending is repeated continuously, the fabric near the guide protrusion is abraded by the end shoulder of the inner roll due to the bending of the guide protrusion in the direction of the central axis of the inner roll, and the fabric is worn out near the inner surface of the guide protrusion. disconnect. Note that when an inner roll having grooves with a depth greater than that of the guide protrusions is used, cutting is performed in the same manner as above.

[0010] In the present invention, an anti-bending part made of polyurethane resin with a width of 30 to 50 mm is arranged at the widthwise end of the fabric at the part where the guide roll is disposed, and a guide protrusion is fused and fixed to this anti-bending part. do. By fusing in this manner, it is firmly bonded to the fabric, resulting in a good guide. The anti-bending portion is formed by stacking a polyurethane resin sheet on the width direction end portion of the fabric and bonding it under heat.The polyurethane resin permeates into the fabric structure and is integrally bonded to the fabric to form an unbendable selvedge. The anti-bending part needs to have a width of 30 mm x 50 mm. 30m
m or less, refraction is likely to occur. Even if it is 50mm or more, the effect remains the same.

[0011] Furthermore, the amount of polyurethane resin in the anti-bending portion must fill 85% or more of the space in the fabric. 85
% or less, the anti-bending effect will be small and the fusion with the guide protrusion will be insufficient. Since the guide protrusion is fused to the anti-bending portion, it is most preferable that the guide protrusion be molded from the same polyurethane resin as the polyurethane resin sheet described above. The shape of the protrusion may be any suitable shape such as rectangular, circular, or triangular in cross section as long as it fits the groove of the inner roll, but a protrusion with a trapezoidal cross section is preferable because it has a large fusion area.

[0012] The use of polyurethane resin for processing the protrusions and ears has high strength, good abrasion resistance, good bonding with textiles, and high flexibility, so folding with the inner roll is good. It is from. The protrusion may be a continuous rod-like body or may be formed of several discontinuous rod-like bodies, but if it is discontinuous, the folding on the inner roll will be better.

[0013] In the endless fabric of the present invention, a polyurethane resin sheet with a thickness of 1 mm to 1.5 mm is layered on the edges of the fabric in the width direction and heat-pressed to allow the resin to sufficiently penetrate into the fabric. Penetrate to near the side surface. Next, a protrusion made of the same polyurethane resin is heat-pressed from the opposite side of the woven fabric sheet, and the two polyurethane resins are fused and integrated. The endless fabric for concentrating paper materials of the present invention continuously removes ink particles, ash, fine fibers that do not form paper, etc. from the aqueous solution of paper materials using the nip pressure between the inner roll and the fabric and the centrifugal force caused by high-speed rotation. That's what I do.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view showing the provision of anti-bending portions and guide protrusions at the edges of the widthwise ends of the fabric of the present invention. 1 is a woven fabric woven with warp 2 and weft 3. A polyurethane resin sheet 4 is stacked on one side of the widthwise end, and a protrusion 5 having a trapezoidal cross section is fused to the opposite side.

FIG. 2 shows an end section of a fabric provided with guide projections. It can be seen that the polyurethane resin sheet heat-pressed onto the fabric penetrates into the structure of the fabric and even penetrates near the opposite surface. In this way, an anti-bending portion is formed. The guide protrusions are also heat-pressed, and a portion of the guide protrusions penetrates into the fabric structure and is fused together with the anti-bending portion. In this way, the edges of the fabric have a structure wrapped in polyurethane resin. Therefore, the fabric does not bend even near the inner side surface of the guide protrusion.

FIG. 3 shows a cross section of the fabric of the present invention stretched over an inner roll 6, with guide protrusions in contact with the end surface of the inner roll. In this example, protrusions are provided on the ears at both ends of the fabric, but even if the protrusions are placed only on one ear, the protrusions will not fall off the inner roll because the increase in width due to skew is prevented.

FIG. 4 illustrates a concentrator for concentrating waste paper material using the fabric of the invention. The paper material 7 is compressed between the inner roll and the fabric, centrifugally dehydrated at the folding part, and collected.

FIG. 5 illustrates the apparatus used in the comparative test. The two inner rolls are arranged so that the circumferential lengths of the left and right ends of the fabric are changed so that the fabric runs diagonally. The fabrics used in the Comparative Test Examples and Comparative Tests are the same fabrics shown in Table 1.

[0020]

[Table 1]

The fabric used was a two-layer fabric with a thickness of 1.10 mm, in which the upper and lower fabrics were connected by a binding thread. The polyurethane resin contained in the ear is 0.082g.
/cm2, filling 100% of the space in the fabric. Example: The endless woven fabric shown in FIG. 2 is made of a polyurethane resin sheet with a thickness of 1 mm and a polyurethane resin sheet with anti-bending portions provided at both ear portions and guide protrusions fused thereto. Comparative example 1. An endless fabric described in JP-A-2-14090, in which guide protrusions made of polyurethane resin are sewn onto both ears with thread. Comparative example 2. Endless fabric with no anti-bending parts, with guide protrusions made of polyurethane resin fused to the ears. Test method: The apparatus shown in Figure 4 was used. That is, the woven fabric was stretched between two rolls with the right and left circumferential lengths changed in advance and arranged so that the woven fabric ran diagonally, and rotated at 400 m/min. The results are shown in Table 2.

[0022]

[Table 2]

[0023]

Effects of the Invention The fabric of the present invention does not suffer from cutting at the edges and can withstand long-term use.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional view showing a state before anti-bending portions and guide protrusions are provided on the fabric.

FIG. 2 is a partial cross-sectional view showing a fabric in which an anti-bending part and a guide protrusion are integrally combined and arranged.

FIG. 3 shows the fabric of the present invention stretched on a roll.

FIG. 4 is an explanatory diagram showing a pulp concentration process.

FIG. 5 is an explanatory diagram showing a comparative test method.

[Explanation of symbols]

1. Textiles 2 Warp 3 Weft 4 Anti-bending section cross section 5 Guide protrusion 6 roll 7 Pulp 8 Head box

Claims (4)

[Claims] Claim 1: An endless fabric formed of a fabric woven from plastic monofilament, and a polyurethane resin disposed at at least one end of the edge in the width direction of the endless fabric, covering 85% or more of the space of the fabric in the edge. an anti-bending portion with a width of 30 to 50 mm that is filled with and contained in the structure of the fabric; and a guide protrusion molded from polyurethane resin that is integrally fused and disposed with the filled polyurethane resin on one surface of the anti-bend portion. An endless fabric for concentrating paper materials such as waste paper. 2. The endless fabric for concentrating paper materials such as waste paper according to claim 1, wherein the processed polyurethane resin of the anti-bending portion does not form a protruding layer on the running surface of the endless fabric. 3. The endless fabric for concentrating paper materials such as waste paper according to claim 2 or 3, wherein the guide projections are projections molded using the same polyurethane resin as the polyurethane resin of the anti-bending portion. 4. A running surface of at least one end of the edge in the width direction of an endless fabric formed of a fabric woven from plastic monofilament, with a width of 30 to 50 mm and a thickness of 1 to 1.5 mm.
A polyurethane resin sheet of 30 mm in width is placed and heat-pressed to form an anti-bending part with a width of 30 to 50 mm, which fills 85% or more of the space of the fabric with polyurethane resin, and then an identical sheet is placed on one side of the anti-bending part. A method for producing an endless woven fabric for concentrating paper materials such as waste paper, characterized in that guide protrusions formed of polyurethane resin are fused and arranged integrally with the polyurethane resin of the anti-bending portion.