WO2007094346A1

WO2007094346A1 - Belt for paper making machine

Info

Publication number: WO2007094346A1
Application number: PCT/JP2007/052581
Authority: WO
Inventors: Tsutomu Ishii
Original assignee: Ichikawa Co., Ltd.
Priority date: 2006-02-14
Filing date: 2007-02-14
Publication date: 2007-08-23
Also published as: JP2007217847A

Abstract

A shoe press belt for controlling water flow in a shoe edge abutting region without generating cracking in the shoe edge abutting region. The shoe press belt has a resin layer formed on the felt side of a substrate, includes a central region, a shoe edge abutting region, and an end region and is characterized in that a step is provided in the shoe edge abutting region. A shoe press belt in a preferable mode has a groove provided in the surface of the resin layer.

Description

Specification

Paper machine belt

Technical field

[0001] The present invention relates to a belt for a papermaking machine such as a calender belt, a press belt, and a wet paper carrying belt used in a papermaking machine. In particular, the present invention relates to a shrew press belt used for increasing the water squeezability from wet paper and felt in a press section of a paper machine. Background art

[0002] In particular, a press press belt used in a press section of a papermaking machine is a base and a belt having a resin layer on both sides thereof, and a groove for squeezing is formed on the surface of the felt side resin layer. What you are doing is the mainstream. For example, in Japanese Patent Laid-Open No. 11-12975 (Patent Document 1), a groove is provided on the surface of the belt-side grease layer of the belt body, and the depth of the groove outside the width of the papermaking sheet is greater than the depth of the groove of the inner area of the papermaking width. There is a proposal that can improve the crack resistance by increasing the strength of the concave groove near the shoulder edge (hereinafter referred to as the shoulder edge contact area).

Also, in German Patent Publication No. 4445472A (Patent Document 2), a groove is provided on the surface of the felt-side grease layer of the belt body, and a groove is not provided in the shoe edge contact area or is formed extremely shallowly. A shrew press belt is proposed.

[0003] When a pressing force is applied and a groove is not provided in the shoe edge abutting region, the shiyu press belt is! In the region, the hydrodynamic force squeezed from the wet paper and the felt in the shiyu press belt central region It is known that the so-called re-wetting phenomenon occurs, which is absorbed again by the wet paper web at the press exit, and the wet paper web profile is damaged. In addition, a shear press belt with a shallow groove in the shoulder edge contact area has a large shearing force and distortion applied to the shoulder edge contact area, so that the groove is damaged and cracked. Is known to occur.

Patent Document 1: Japanese Patent Laid-Open No. 11-12975

Patent Document 2: German Patent Publication 4445472A

Disclosure of the invention

Problems to be solved by the invention [0004] The present invention focuses on the characteristics of the shoe edge contact portion region of the shoe press belt, and controls the water flow squeezed from the wet paper and the felt in the region, and is applied to the shoe edge contact portion region. In order to prevent the occurrence of cracks by dispersing the shearing force and strain, the structure of the sue edge contact area is improved.

Means for solving the problem

In order to achieve the above object, according to the present invention, a grease press belt is formed on at least a felt side of a belt base, and the width direction of the press press belt is a central region. A shoe press belt comprising a shoe edge abutting region and an end region, wherein a step is provided in the shoe edge abutting region.

[0006] A shrew press belt in which the step is an inclination formed by a parabolic curve is a preferred aspect of the present invention.

[0007] A shrew press belt in which the step is formed in a staircase shape, the corner of the staircase is formed in a curve, and the bottom corner of the staircase is formed in a concave curve is another preferred embodiment of the present invention. It is a mode.

[0008] A shrew press belt in which the step is formed in a stepped shape is a more preferable aspect of the present invention.

[0009] The present invention also provides a shear press belt having a plurality of concave grooves provided on the surface of the resin layer in the belt running direction.

The invention's effect

[0010] According to the present invention, since the shoulder edge contact area is provided with a step, the water flow squeezed from the wet paper and the felt in the area is directed to the central area of the shoe press belt. Since it goes to the outermost edge region, it has the effect of preventing rewetting at the press exit.

Further, the step of the edge contact portion is a sloped curve formed in a smooth parabola shape, or formed in a step shape, and the corner of the step forms a smooth slope curve, and Since the bottom corner of the staircase forms a smooth concave curve, it is possible to disperse the shearing force and strain applied to the shoe edge contact area, so even if a groove is formed in that area. In addition, it has an excellent effect that no cracks are generated. In addition, when it is formed in a multi-step staircase, the cracks and distortion applied to the shoe edge contact area can be gradually dispersed and damped in each staircase, so that more cracks are generated. Can be prevented.

[0011] The present invention has been briefly described above. Further, the best mode for carrying out the present invention will be described in detail with reference to the accompanying drawings.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[0013] FIG. 1 illustrates a process of squeezing wet paper strength using a shrew press belt.

In FIG. 1, a pressing press belt 1 force travels between the press roll 2 and the press 3 with the felt 4 and the wet paper 5 placed thereon, and the pressure formed between the press roll 2 and the press 3 is set to the wet paper 5. Squeezing is accomplished by telling

FIG. 2 is a cross-sectional view of the edge portion of the shoe press belt 1 showing the positional relationship between the shoe press belt 1 and the shoe 3. In the present invention, the region B where the edge portion of the shoe 3 abuts is referred to as a single edge abutting portion region. The center portion A of the press belt located between the two edge contact portions is referred to as the center region, and the portion C outside the contact edge contact region is referred to as the end region. In FIG. 2, the central portion of the central region is not shown.

FIG. 3 is a cross-sectional view in the width direction showing the configuration of the shoe press belt 1 according to the present invention.

The shush press belt 1 of the present invention has a laminated structure in which a resin layer, preferably a polyurethane layer, is laminated on both surfaces of a base 11.

In order to laminate the polyurethane layer on the substrate 11, a liquid urethane prepolymer containing a curing agent is applied to the substrate, impregnated, and cured by drying or heating to laminate a solid high molecular weight polyurethane.

As shown in FIG. 3, the shoe press belt 1 also includes a base 11, a felt-side grease layer 12, and a shoe-side grease layer 13, and the shoe press belt 1 is in the width direction. It can be seen that the center area A, the edge contact area B, and the edge area C force.

[0018] The substrate 11 is for imparting strength to the squeeze press belt 1. For example, nylon 6, nylon 66, etc. excellent in wear resistance, fatigue resistance, stretch characteristics and antifouling properties, etc. Laminated fabrics or yarns made of synthetic fibers, natural fibers such as wool, etc. It is possible to appropriately use the ones made into a film or the like. Of these, woven fabric is preferably used.

[0019] On the surface of the felt-side resin layer 12, a plurality of concave grooves can be formed in the central region A in the belt running direction. By forming the concave groove, the water stream squeezed from the wet paper and the felt can be easily discharged. In this case, the groove portion need not be formed in the shoulder edge contact area B and the end area C. However, a groove that is shallower than the groove formed in the central region A may be formed in the shoulder edge contact region B. A shrew press belt in which a plurality of concave grooves are formed in the belt running direction is a preferred embodiment of the present invention.

FIGS. 4 to 6 show examples of the embodiment of the present invention, and schematically show the vicinity of one end of the cross section in the width direction of the shoe press belt 1.

FIG. 4 is a cross-sectional view of a shoe press belt which is a first preferred embodiment of the present invention.

The shoulder edge contact area B is provided with a step, which is a slope formed by a parabolic curve. The curve is preferably as smooth as possible. The surface of the central region A is flat, and a step is formed on the surface of the shoulder edge contact region B, and the step is formed by the inclination of the sectional view curve. The cross section of the step formed is preferably a parabola whose angle is gradually lowered. In the vicinity of the boundary between the shoulder edge contact region B and the end region C, it is preferable that the bottom corner forms a smooth concave curve. In the shoe press belt of the present invention, a step is provided in the shoe edge contact portion region B, so that the thickness of the end region C is smaller than the thickness of the central region A.

FIG. 5 is a cross-sectional view of a shoe press belt which is a second preferred embodiment of the present invention.

In the shoulder edge contact area B, the step is formed in a staircase shape, the corner of the staircase is formed in a curve, and the bottom corner of the staircase is formed in a concave curve. It is preferable that the corner portion of the staircase forms a smooth sloped curve, and the bottom corner of the staircase forms a smooth concave curve, and is a sushi press belt.

FIG. 6 is a sectional view of a shoe press belt which is a third preferred embodiment of the present invention.

In the shoulder edge contact area B, there is shown a mode in which the level difference is formed in a plurality of steps. It is preferable to use a squeeze belt in which the corners of the individual stairs form a smooth sloped curve and the individual bottom corners form a smooth concave curve. That's right. FIG. 6 shows an aspect in which a plurality of concave grooves are formed in the central region A in the belt running direction on the surface of the felt-side resin layer 12.

[0024] In the shoe press belt of the present invention, a step is provided in the shoe edge abutting region, so that the water flow squeezed from the wet paper and the felt in this region is the center of the shoe press belt. Since it goes to the outermost end region without going to the region, it has the effect of preventing rewetting at the press exit.

[0025] In addition, the shoulder press contact area of the present invention is a sloped curve formed in a smooth parabola shape, or a step shape, and the steps of the shoulder edge contact portion region are Since the corners form a smooth slope curve and the bottom corner of the staircase forms a smooth concave curve, the shearing force and strain applied to the sue edge contact area are dispersed. Therefore, even if a ditch is formed in the area, no crack will occur! , Have an excellent effect.

[0026] Further, when the step is formed in a plurality of steps, the shearing force and strain applied to the shoe edge contact area can be gradually dispersed and attenuated in each step. Further, the generation of cracks can be prevented. A shrew press belt in which such steps are formed into a plurality of steps is a more preferred embodiment of the present invention.

As described above, a preferred press belt 1 according to the present invention is a shoe press belt in which a resin layer 12 is formed on the felt side of a substrate 11 and a groove is provided in the resin layer. The width direction of the shoe press belt 1 is composed of a center region A, a shoe edge contact portion region B, and an end region C, and the shoe press contact portion region B is provided with a step. It is.

[0028] In addition, such a squeeze press belt, which is a sie press belt in which a step is a curved curve formed in a parabolic shape having a smooth cross-sectional view, is a preferred aspect of the present invention.

[0029] Further, in such a shrew press belt, the step is formed in a stepped shape when viewed in cross section, the corner of the step forms a smoothly inclined curve, and the bottom corner of the step is A press belt that forms a smooth concave curve is a preferred embodiment of the present invention.

Further, in such a shrew press belt, the steps are formed in a plurality of steps, and each step A shrew press belt in which the corners of the stairs form a smooth sloped curve and the bottom corners of the stairs form a smooth concave curve is a more preferred embodiment of the present invention.

Industrial applicability

[0030] According to the present invention, since a step is provided in the shoe edge contact portion region, the water flow squeezed from the wet paper and the felt in the region does not go to the central region of the shoe press belt, An excellent squeeze press belt having the effect of avoiding re-wetting phenomenon at the press exit because it faces the end region is provided.

According to the present invention, since the shearing force and strain applied to the shoe edge contact portion region can be dispersed, even if a concave groove is formed in the region, there is an excellent effect that no crack is generated. In addition, when formed in a multi-step staircase, the shearing force and strain applied to the shoe edge contact area can be gradually dispersed and damped in each staircase, further preventing cracking. An excellent shoe press belt having the effect of being able to be provided is provided.

Brief Description of Drawings

[0031] FIG. 1 is an exemplary schematic diagram of a press device.

FIG. 2 is a schematic view showing a portion corresponding to the shoe of the shoe press belt of the present invention.

FIG. 3 is a cross-sectional view showing an outline of a shoe press belt of the present invention.

FIG. 4 is a cross-sectional view schematically showing a shoe press belt according to the first embodiment of the present invention.

FIG. 5 is a cross-sectional view schematically showing a shoe press belt according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view schematically showing a shoe press belt according to a third embodiment of the present invention. Explanation of symbols

[0032] 1: Syu Press Benoret

2: press ronole

3: Shu

4: Felt

5: Wet paper

11: Base 12: Felt-side grease layer 13: Shear-side grease layer 14: Concave groove

A: Central area

B: New edge contact area C: End area

Claims

The scope of the claims

[1] A shrew press belt in which a resin layer is formed on at least the felt side of the belt base, and the width direction of the shrew press belt is divided from a center region, a shoulder edge contact portion region, and an end region. A shoe press belt characterized in that a step is provided in the shoe edge contact portion region.

[2] The shoe press belt according to claim 1, wherein the step is a curved curve formed in a smooth parabolic shape.

[3] The step is formed in a staircase shape, the corner of the staircase forms a smooth sloped curve, and the bottom corner of the staircase forms a smooth concave curve The Shu press belt according to claim 1.

[4] The pressless benolet according to [3], wherein the step is formed in a plurality of steps.

[5] The shoe press belt according to any one of [1] to [4], wherein a plurality of concave grooves are provided on a surface of the resin layer in a belt running direction.