JPH0867318A - Sailcloth core body for wide belt and manufacture thereof - Google Patents

Abstract

PURPOSE: To provide a sailcloth core body constituting the center member of a wide width belt capable of restraining the belt from the contraction accompanying the tension in the longitudinal circumferential direction of the belt and driven from the tension in the width direction of the belt in the travelling of the wide width belt having the extremely thin thickness and peculiar shape. CONSTITUTION: A sailcloth core body 1 forming the main constituent of a wide width belt is woven into a wide width tubular form which is seamless both in the circumferential direction and width direction by longitudinal cords 2 in the circumferential direction and lateral cords 3 in the width direction. The condition of the tubular sailcloth elongated in the circumferential direction is fixed to a predetermined elongated condition by the hardening process of thermoplastic resin 4 impregnated in the sailcloth.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a canvas core for a wide belt and a method for manufacturing the same. More specifically, the present invention relates to a wide canvas core that constitutes a part of a wide belt suitable for manufacturing corrugated paper that is incorporated into a part of a corrugating machine of a corrugated paper manufacturing line and a method for manufacturing the same. .

[0002]

2. Description of the Related Art In a conventional corrugated paperboard manufacturing apparatus, high temperature steam is fed into the inside of the corrugated paperboard, the surface of the corrugated paper is heated, and the core paper is rolled between a pair of tooth-shaped rolls meshing with each other to form a corrugated core Starch glue is applied to the top of the paper, and the corrugated corrugated core paper and liner paper are combined in a separate rear line with a heat-resistant belt, roller, felt, etc. After being sent, the core paper and liner paper are attached. However, in the conventional corrugated paperboard manufacturing means, the work efficiency is significantly reduced by first adopting the mold forming step, the subsequent sticking step, the forming step and the multi-step step.

Thereafter, for the purpose of simplifying the mechanism and increasing the efficiency of the work, a corrugating process of corrugating with a pair of corrugating tooth rolls, the tooth rolls, and a wide belt arranged so as to come into contact with the corrugating rolls. A corrugated paperboard manufacturing apparatus has been proposed which is capable of accomplishing a series of the work of patterning core paper by combining and sticking with liner paper in an integrated manner.

That is, in the improved corrugated paperboard manufacturing apparatus 21, as shown in an example in FIG. 5, a core paper 23 is fed between a pair of meshing tooth type rolls 22A and 22B, and both rolls 22A are provided. , 22B, corrugated patterning is performed on the core paper 23, and starch paste is applied to the corrugated top part of the modeled core paper 23 by the glue application device 24.

A heating device (not shown) for evaporating the water impregnated in the corrugated paperboard and performing accurate patterning is provided on the surface of the tooth form roll 22B on the side to which the glue applying device 24 is attached. The equipped endless belt mechanism 25 for pressurization, that is, a part of the wide belt A suspended between the pair of drum-shaped pulleys 26, 26 is arranged so as to be capable of pressure contact while maintaining an arc-shaped contact area.

The liner paper 27 fed between the wide belt A and the tooth type roll 22B is wrapped around a part of the surface of the tooth type roll 22B and is overlapped with the glue-coated core paper 23A to form the wide belt A. The corrugated paper 28 is completed by pressure bonding between the tooth type rolls 22B.

The pressure belt used in this type of apparatus is in constant pressure contact with the tooth portion of the tooth type roll and is arranged in a high temperature environment. Further, since the object to be manufactured is wide corrugated cardboard, the wide belt itself, It must be able to withstand the load in the belt width direction. When the wide belt having a wide shape and a small thickness and a peculiar shape is insufficient in rigidity in the belt width direction, wrinkles occur during belt running, which also contributes to the belt meandering.

Therefore, conventionally, a steel belt is widely used as the wide belt A for pressing. However, this wide steel belt is expensive, and in the event of an unexpected belt cutting accident, an accident resulting in injury or death, large-scale damage to incidental equipment, and the adoption of a steel belt make the entire equipment larger, and the steel belt is more durable. There is a particular problem in terms of bending fatigue, and as such, the corrugated board making machine that uses a wide steel belt as a part cannot achieve sufficient satisfaction in terms of work efficiency in order to speed up the line. It was

The applicant of the present invention has proposed a wide belt which is used by being incorporated in a part of a corrugating machine, as disclosed in JP-A-6-48529. The belt, as a core body forming one main constituent part of the belt, a wide, seamless endless canvas in the belt circumferential direction and width direction is used, and cover elastic layers are arranged on both front and back surfaces of the canvas core body, In the front cover layer, short fibers are embedded with orientation in the belt width direction, while in the back cover layer, a thermally conductive powder-granular member is mixed and embedded.

In this wide belt, the central member of the toughness, durability, and shape retention is a wide canvas core, and the applicant of the present invention further improved this wide core. In addition, as disclosed in Japanese Patent Application Laid-Open No. 6-107311,
The canvas core is made of a single circular loom capable of covering the entire width of the belt or a loom having the same performance as that of a seamless tubular shape in both the circumferential direction and the width direction, and the cords are arranged in the circumferential direction and the width direction. The number density is 10 to 50 per 5 cm, and the variation in the number of cords is woven within ± 0.5 over the entire width and the entire length.

Due to the density of the cords with less variation having the above construction, the wide belt using this canvas core body has sufficient rigidity in the belt width direction, has very little elongation, and causes twisting and meandering of the belt. To prevent
It can be expected to achieve an average corrugated board production work at each belt.

[0012]

However, as described above, as one component of the corrugating machine, under the severe conditions, when the wide belt is used, the belt is strongly tensioned in the circumferential direction of the belt. When it acts, the belt stretches in the circumferential direction due to this tensile force, and the wide belt contracts in the width direction accordingly, and the width of the wide belt decreases. It will cause a big trouble in the.

The present invention suppresses the change in elongation of the belt, more specifically, the canvas core of the belt, even when an abnormal tensile force acts in the circumferential direction of the belt, and thus the shrinkage phenomenon in the belt width direction. The purpose of the present invention is to provide a canvas core for a wide belt and a method for manufacturing the same, which prevents the occurrence of wrinkles in the belt width direction and does not hinder the manufacture of wide corrugated cardboard. To do.

[0014]

In order to achieve the above object, firstly, a wide belt canvas core body according to the present invention has the following construction. That is, in the stretched state in the circumferential direction, a wide tubular canvas that is seamlessly woven in the circumferential direction and the width direction by the longitudinal cord and the transverse cord,
The stretched state is fixed by a curing treatment of a thermosetting resin impregnated in canvas. The shrinkage ratio in the width direction, which is relatively derived from the circumferential stretching of the tubular canvas, is set in the range of 7 to 12%.

The method of manufacturing a wide belt canvas core body according to the present invention employs the following construction. The core canvas is woven in a wide tubular shape that is seamless in both the circumferential and width directions, the first step, the second step of impregnating the tubular canvas with a thermosetting resin, the thermosetting resin-impregnated tubular canvas The third step is to stretch the canvas in the circumferential direction during the rotation and running of the canvas, and the thermosetting resin impregnated in the canvas is heated under the stretching condition. Is the final step of hardening and fixing the stretched state of the canvas core. Further, the amount of stretching of the tubular canvas in the circumferential direction is characterized in that the shrinkage rate in the width direction, which is relatively derived from this, is set in the range of 7 to 12%.

In both of these inventions, the longitudinal and transverse cords are composed of aromatic polyamide fiber yarns or polyether ether ketone fiber yarns. further,
The thermosetting resin for curing and fixing the stretched canvas core is characterized by using epoxy or resorcin-formalin latex (RFL).

[0017]

EXAMPLES Next, specific examples of a wide belt canvas core body according to the present invention and a method for manufacturing the same will be described with reference to the drawings. When this canvas core is used as a main constituent material of a wide belt which constitutes one member of a corrugated paperboard manufacturing apparatus, a remarkable effect is exhibited.

FIG. 1 is an overall perspective view of a wide belt canvas core body according to the present invention, in which a tubular core body shown by an imaginary line shows a state before a stretching and fixing process. FIG. 2 is a schematic front view of an apparatus for performing a stretching and fixing operation on a canvas core.

The wide canvas core 1 according to the present invention has a lateral width of about 1200 to 3000 mm and a circumferential length of about 1000 to 35000.
It has a very wide shape of mm. This canvas core 1 is made of a low-stretch, high-strength woven canvas, specifically aromatic polyamide fiber yarn (also known as aramid fiber yarn), polyether ether ketone fiber yarn, polyester fiber yarn, nylon fiber yarn, etc. The canvas core body 1 woven in a tubular shape, that is, an endless shape, has a seamless shape with no step in the circumferential direction and the width direction. Among the above fiber yarns, particularly aromatic polyamide fiber yarns and polyether ether ketone fiber yarns are preferable fiber yarns in terms of toughness and heat resistance.

The canvas core 1 is made by aligning or twisting long filaments of the above-mentioned filaments into yarns each having a fineness of 1000 to 2000 denier, and further 2
A cord formed by twisting 10 to 10 cords is woven by a circular loom or a loom having the same performance as a plain weave, a mat weave, a twill weave, or a satin weave. In addition, the fineness per one cord of the canvas core is 1000 to
The number of twists of 2,000 denier yarn is 50 times / m
100 times / m.

The number of the vertical cords 2 that correspond to the circumferential direction of the tubular canvas core and the horizontal cords 3 that match the width of the core, that is, the cord density, is 5c.
The number of cords is 10 to 50 per m, and the variation in the number of cords at this time is within ± 0.5 over the entire width and the entire length of the canvas core body. Local excessive elongation phenomenon and deformation are suppressed.

Further, the cord twisting direction of the longitudinal cords 2 which coincide with the circumferential direction of the belt constituting the canvas core 1 is finally changed by alternately combining the S-direction twisting and the Z-direction twisting for each vertical cord 2. Is designed to prevent the belt from meandering.

The tubular woven canvas core 1 is dipped in an uncured liquid thermosetting resin, or a liquid thermosetting resin is applied to both front and back surfaces of the canvas core to obtain sufficient thermosetting. Resin 4 is uniformly impregnated over the entire surface of the canvas core, and the resin impregnation amount in this case is about 300 to 1000 g / m ² . Further, the thermosetting resin impregnation treatment in this case is, for example, specifically epoxy resin treatment, resorcin.
Formalin latex (RFL) treatment is very common, and both of these resin treatments are highly tough and stable.

A tubular canvas core 1 fully impregnated with a thermosetting resin 4 is mounted between a plurality of drum-shaped pulleys 15 and 15, and as the pulleys rotate and move in a predetermined direction, the canvas core 1 The body 1 is stretched in the circumferential direction in the process of circulating travel, and the canvas core is relatively narrowed in the width direction with a shrinkage ratio in the range of 7 to 12%, so that the tubular canvas core 1 is circumferentially stretched. Stretch,
On the other hand, it contracts in the width direction (see FIG. 2).

When the shrinkage rate of the canvas core in the width direction is 7% or less, the belt after completion is contracted again in the width direction as the belt tension increases.
The intended purpose cannot be achieved. On the other hand, if the shrinkage ratio is 12% or more, the longitudinal cords may overlap due to width shrinkage during the stretching process of the canvas, which is not preferable.

The canvas core which is circulating and running while maintaining the above predetermined stretched state is heated by its one-sided or double-sided heaters 16, 16 or hot air, the thermosetting resin 4 is thermoset, and the drum pulley 15, The tubular canvas core 1 removed from 15 is stably fixed in shape while maintaining a predetermined stretched state. As for the conditions for stretching and fixing the canvas core, optimal curing conditions are required for each thermosetting resin used, but the heating temperature is 100 to 250 ° C. and the heating time is 1 to 30.
It is appropriately selected within the range of minutes.

The structure of the wide belt 10 mainly composed of the tubular canvas core 1 which has been sufficiently stretched in the circumferential direction will be described below. The heat resistant elastomer layer is provided on the upper surface of the canvas core 1.
For example, a heat resistant elastomer layer 5 made of rubber or synthetic resin such as styrene / butadiene rubber, ethylene / propylene rubber, butyl rubber, fluorine rubber, hydrogenated nitrile rubber or polytetrafluoroethylene is laminated. If necessary,
Short fibers 6 having a length of 2 to 20 mm and excellent in durability, such as aromatic polyamide short fibers (aramid short fibers), cotton short fibers,
Polyester short fibers are rubber or synthetic resin material 100
It is embedded at a ratio of 5 to 30 parts by weight with respect to parts by weight while maintaining the orientation in the belt width direction.

Further, on the surface of the heat-resistant elastomer layer 5, a skin cloth 7 having elasticity in the longitudinal direction of the belt.
However, the heat-resistant elastomer layer 5 is laminated and adhered as an adhesive layer.

This skin canvas 7 has a longitudinal cord 8 which coincides with the circumferential direction of the belt with a mixed twisted yarn of aromatic polyamide fiber (also called para-type aramid fiber or meta-type aramid fiber) and urethane elastic fiber in the belt width direction. Matching horizontal code 9
A plain weave, twill weave, or satin weave using one of the aromatic polyamide fiber yarn, nylon fiber yarn, and polyester fiber yarn, or a knitted fabric fabric using aromatic polyamide fiber yarn. There is.

Further, the surface of the outer cloth 7 is coated with a coating 11 made of a heat-resistant elastomer mixed with a powdery fluororesin in order to obtain a releasing effect, and the wide belt 10 is also formed on the lower surface of the canvas core 1. The coating 12 is made of a heat-resistant elastomer having a thickness of about 0.1 mm so that the friction coefficient of the back surface is 0.3 or less with respect to iron.

The wide belt 10 using the tubular canvas core 1 which has been sufficiently stretched and fixed in the circumferential direction is a wide belt and is an extremely thin belt. As shown, the width is set to 1200 to 3000 mm, the peripheral length is set to 1000 to 35000, and the thickness thereof is set to 3.5 mm or less.

Next, the tubular canvas core body is subjected to a stretching treatment to gradually change the width shrinkage amount of the core body including the non-shrinkage in the width direction of the core body, and this core. The results of the determination as to whether or not the wide belt 10 is suitable for use due to the width contraction that occurs when the wide belt mainly composed of the body is driven are as follows.

Width shrinkage associated with core stretching treatment Width shrinkage during use of belt Judgment 0% 6% x (unsuitable) 1-5% 5% x (unsuitable) 6-8% 3.5% △ (semi-unsuitable) 8 -10% 2.0% ○ (appropriate) 10-12% 1.0% ○ (appropriate) Width shrinkage ratio 7 to 7 of the core body caused by the stretching treatment of the canvas core body
A wide belt using a canvas core in the range of 12% has a belt width shrinkage ratio of 3.0% or less in actual use, and in order to achieve the intended purpose of the wide belt. So it didn't hurt a lot.

[0034]

EFFECTS OF THE INVENTION In a wide belt using the tubular canvas core body according to the present invention, which is wide and has a peculiar shape of thin wall, the strength and shape retention of the belt itself are the main components of the belt. There is no choice but to rely heavily on the canvas core as a member. Therefore, the characteristics and performance of the canvas core are strongly linked to the characteristics and performance of the wide belt.

In the present invention, the canvas core itself is subjected to a predetermined stretching treatment in the circumferential direction in advance, and a predetermined stretched state is cured by a thermosetting resin to maintain the stretched state. By fixing, and by suppressing the occurrence of changes in the width direction of the canvas core due to the extension change of the canvas core,
Even when the tension applied to the wide belt is changed, it suppresses the expansion and shape change of the belt in the circumferential direction, and further suppresses the contraction and shape change in the belt width direction, which is stable in shape. It is possible to ensure stable use of the wide belt using the core over a long period of time.

Further, the stretching treatment in the circumferential direction when the canvas core body is hung on a plurality of drum-shaped pulleys, and the shrinkage in the width direction of the canvas core body resulting from the stretching treatment are realized substantially uniformly at each position of the belt. Therefore, it is possible to reliably prevent the occurrence of the phenomenon of expansion of the wide belt using the canvas core in the circumferential direction, and it is possible to prevent the belt from meandering and twisting. Further, the suppression of the contraction movement of the core body in the width direction has a great effect on ensuring the stability of a wide corrugated paperboard forming and gluing operation which is executed in series on the wide belt.

In the wide belt using the canvas core according to the present invention, which is used as one component of the corrugated paperboard manufacturing apparatus, various operations such as molding and bonding of corrugated paperboard are directly performed on the belt. Even if it is executed and used in a harsh environment, the stretch deformation of the belt itself is suppressed, and accurate work can be continued for a long time on the belt. The durability of the belt can be ensured for a long period of time.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a wide belt canvas core body according to the present invention.

FIG. 2 is a schematic front view of an apparatus for performing a stretching and fixing operation of a canvas core body according to the present invention.

FIG. 3 is a perspective view of a part of a wide belt mainly including a canvas core body according to the present invention.

FIG. 4 is a partially enlarged end view of the belt.

FIG. 5 is a schematic front view of a corrugated board manufacturing apparatus incorporating a wide belt.

[Explanation of symbols] 1 canvas core 2 vertical cord 3 horizontal cord 4 thermosetting resin 15,15 drum pulley 16,16 heater

[Procedure amendment]

[Submission date] October 11, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction content]

The wide canvas core 1 according to the present invention has a width of 1
It has an extremely wide shape of 200 to 3000 mm and a circumferential length of 1000 to 3500 mm. This canvas core 1
Is a woven canvas with low elongation and high strength, specifically aromatic polyamide fiber yarn (also known as aramid fiber yarn), polyetheretherketone fiber yarn, polyester fiber yarn, nylon fiber yarn, etc. Endlessly woven canvas core 1
Has a seamless shape with no step in both the circumferential direction and the width direction. Among the above fiber yarns, particularly aromatic polyamide fiber yarns and polyether ether ketone fiber yarns are preferable fiber yarns in terms of toughness and heat resistance.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction content]

The wide belt 10 using the tubular canvas core 1 which has been sufficiently stretched and fixed in the circumferential direction is a wide belt and is an extremely thin belt. As shown, the lateral width is 1200 to 3000 mm , the circumferential length is 1000 to 3500 mm , and the thickness is set to 3.5 mm or less.

Claims (18)

[Claims] 1. A wide tubular canvas which is stretched in the circumferential direction and which is seamlessly woven in both the circumferential direction and the width direction by a longitudinal cord and a transverse cord is a thermosetting resin in which the stretched state is impregnated in the canvas. A canvas core for wide belts, which is fixed by the hardening process of the resin. 2. A canvas core for a wide belt according to claim 1, wherein the shrinkage ratio in the width direction of the canvas, which is relatively derived by stretching the tubular canvas in the circumferential direction, is in the range of 7 to 12%. 3. The canvas core for a wide belt according to claim 1, wherein the longitudinal and transverse cords constituting the canvas core are composed of aromatic polyamide fiber threads or polyether ether ketone fiber threads. 4. The canvas core is one sheet that can cover the entire width of the belt, but the density of the number of cords arranged in the circumferential direction and the width direction by the loom is 10 to 50 per 5 cm, and the cords are The variation in the number is ± across the entire width and length.
Of 1 to 3 which is woven within 0.5,
The canvas core body for a wide belt according to any one of items. 5. The longitudinal and transverse cords constituting the canvas core are made by aligning or twisting long fiber filaments, and further twisting 2 to 10 yarns each having a fineness of 1000 to 2000 denier per strand. The canvas core for a wide belt according to any one of claims 1 to 4, wherein: 6. The number of twists of the yarn having a fineness of 1000 to 2000 denier per one of the longitudinal and transverse cords constituting the canvas core is 50 times / m to 100 times / m. Among them, the canvas core body for a wide belt according to any one of items. 7. The twisting direction of the vertical cords, which correspond to the circumferential direction of the belt forming the canvas core, is S alternately for each cord.
Direction and Z direction are repeated, among claims 1 to 6,
The canvas core body for a wide belt according to any one of items. 8. The woven fabric of the canvas core is woven with any one of plain weave, twill weave, satin weave and mat weave, according to any one of claims 1 to 7. Canvas core for wide belts. 9. The canvas core body for a wide belt according to claim 1, wherein the thermosetting resin is composed of epoxy resin or resorcin-formalin latex (RFL). 10. A method of manufacturing a canvas core for a wide belt, which comprises the following steps a to d. a. A process in which the core canvas is woven into a tubular shape that is seamless and wide in both the circumferential direction and the width direction by the longitudinal cord and the transverse cord, b. A step of impregnating a tubular core canvas with a thermosetting resin, c. A step in which a resin-impregnated core canvas is hung between a plurality of drum-shaped pulleys and stretched in the circumferential direction while the canvas is rotating and running, d. The step of heating the core canvas in a stretched state to cure the impregnated thermosetting resin and fix the stretched state of the canvas core. 11. The wide belt according to claim 10, wherein the amount of stretching of the tubular canvas in the circumferential direction is set in the range of 7 to 12% in the shrinkage ratio in the width direction of the canvas associated with the stretching operation. For manufacturing a canvas core body for automobiles. 12. The vertical and horizontal cords constituting the canvas core are composed of aromatic polyamide fiber threads or polyether ether ketone fiber threads.
1. A method for producing a canvas core for a wide belt according to 1. 13. The canvas core is one sheet that can cover the entire width of the belt, but the density of the number of cords arranged in the circumferential direction and the width direction by the loom is 10 to 50 per 5 cm.
The method for manufacturing a canvas core for a wide belt according to any one of claims 10 to 12, wherein the number of cords is woven within ± 0.5 over the entire width and the entire length. . 14. The longitudinal and transverse cords constituting the canvas core are made by aligning or twisting long fiber filaments together to form 1
A yarn having a fineness of 1000 to 2000 denier per yarn is further twisted in an amount of 2 to 10 and the yarn is twisted.
4. The method for manufacturing a canvas core for a wide belt according to any one of 3, 15. The number of twists of the yarn having a fineness of 1000 to 2000 denier per one of the longitudinal and transverse cords constituting the canvas core is 50 times / m to 100 times / m. Among them, the method for manufacturing a canvas core for a wide belt according to any one of items. 16. The twisting direction of the longitudinal cords which coincide with the circumferential direction of the belt constituting the canvas core is formed by alternately repeating the S direction and the Z direction for each cord. 2. A method for manufacturing a canvas core for a wide belt according to item 1. 17. The woven structure of the canvas core body is plain weave, twill weave,
The method for producing a wide belt canvas core according to any one of claims 10 to 16, which is woven with a satin weave or a mat weave. 18. The method for producing a wide belt canvas core according to claim 10, wherein the thermosetting resin is composed of an epoxy resin or resorcin-formalin latex (RFL).