JP2972978B2 - Canvas core for wide belt and method of manufacturing same - Google Patents

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 producing the canvas core. More specifically, the present invention relates to a wide canvas core constituting a part of a wide belt suitable for the production of corrugated paperboard used by being incorporated in a part of a corrugating machine of a corrugated paperboard production line, and a method for producing the same. .

[0002]

2. Description of the Related Art In a conventional corrugated paperboard manufacturing apparatus, high-temperature steam is fed into the inside, the surface is heated, and the core paper is stepped 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 glued corrugated core paper and liner paper are applied to a crimping device that is appropriately combined with heat-resistant belts, rollers, felts, etc. in another rear line. Then, the core paper and the liner paper are attached to each other. However, in the conventional corrugated paperboard manufacturing means, the work efficiency is greatly reduced by first employing a molding step, a subsequent sticking step, and a molding step and a multi-step step.

[0003] Thereafter, in order to simplify the mechanism and improve the efficiency of the operation, a corrugating die forming operation having a pair of corrugated toothed rolls, the toothed rolls, and a wide belt arranged to be in contact with the corrugated die rolls are performed. There has been proposed a corrugated paperboard manufacturing apparatus capable of performing a series of and integrated operations of forming the core paper and attaching the liner paper by combining them.

More specifically, in the improved corrugated paperboard manufacturing apparatus 21, as shown in FIG. 5, a core paper 23 is fed between a pair of meshing toothed rolls 22A and 22B, and both the rolls 22A are rotated. , 22B are engaged with each other, corrugating is performed on the core paper 23, and the glue applying device 24 performs starch gluing on the step tops of the formed core paper 23.

A heating device (not shown) for evaporating and impregnating the moisture impregnated in the corrugated cardboard and accurately forming the mold is provided on the surface of the tooth roll 22B on which the glue applying device 24 is provided. The equipped endless belt mechanism for pressurization 25, that is, a part of the wide belt A suspended between the pair of drum-shaped pulleys 26, 26 is disposed so as to be able to press-contact while maintaining an arc-shaped contact area.

[0006] The liner paper 27 fed between the wide belt A and the toothed roll 22B is wound around a part of the surface of the toothed roll 22B and is overlapped with the glued core paper 23A during the movement. The corrugated paper 28 is completed by pressure bonding between the toothed rolls 22B.

[0007] The pressure belt used in this type of apparatus is always in pressure contact with the teeth of the toothed roll and is arranged in a high-temperature environment. Further, since the object to be manufactured is a wide corrugated cardboard, the wide belt itself can be used. It is required to be able to sufficiently withstand the load in the belt width direction. Wide and wide belts having a unique shape with a small thickness cause wrinkles during belt running when the rigidity in the belt width direction is insufficient, which contributes to belt meandering.

Conventionally, a steel belt has been 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, personal injury, large-scale damage to incidental equipment, and the use of steel belts make the entire equipment larger, and steel belts are more resistant to There is a specific problem in terms of flex fatigue, and such a corrugated cardboard manufacturing machine partially using a wide steel belt cannot be sufficiently satisfactory in terms of work efficiency intended to speed up the line. Was.

The present applicant has proposed a wide belt to be incorporated in a part of a corrugating machine and used as disclosed in Japanese Patent Application Laid-Open No. 6-48529. The belt uses a wide, seamless endless canvas in the circumferential and width directions of the belt as a core forming one main component of the belt, and a cover elastic layer is disposed on both front and back surfaces of the canvas core. 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 powdery and granular member is embedded and embedded.

In this wide belt, a member which is the center of toughness, durability and shape retention is a wide canvas core, and the present applicant has further improved this wide canvas core. In addition, as disclosed in JP-A-6-107731,
The canvas core has a seamless cylindrical shape in both the circumferential direction and the width direction by a single circular loom or a loom having the same performance as the circular loom capable of covering the entire width of the belt, 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.

By increasing the density of the cord having the above-mentioned structure and having a small variation, the wide belt using the canvas core maintains a sufficient rigidity in the belt width direction, has very little elongation, and generates twisting and meandering of the belt. To prevent
It can be expected that the average corrugated cardboard manufacturing work will be achieved in various parts of the belt.

[0012]

However, as described above, when a wide belt is used as a component of the corrugating machine under severe conditions as described above, strong tension is applied to the belt in the circumferential direction of the belt. When acted on, the belt expands in the circumferential direction due to this pulling force, and accordingly, the wide belt contracts in the width direction, and the decrease in the width of the wide belt is caused by the production of wide corrugated paper as the object to be manufactured. The result is a great hindrance.

The present invention suppresses a change in elongation of a belt, more specifically, a fabric core of a belt, even when an abnormal tensile force acts on the belt in the circumferential direction. It is an object of the present invention to provide a canvas core for a wide belt and a method for producing the canvas core, which prevent occurrence of wrinkles and wrinkles in the belt width direction and do not hinder the production of wide corrugated paper. I do.

[0014]

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

The method of manufacturing a canvas core for a wide belt according to the present invention employs the following configuration. The first step in which the core body canvas is woven into a wide cylinder that is seamless in both the circumferential direction and the width direction, the second step in which the tubular canvas is impregnated with a thermosetting resin, the tubular canvas impregnated with a thermosetting resin Is stretched between drum-shaped pulleys to stretch the canvas in the circumferential direction during the rotation and running of the canvas.The canvas is heated under the stretching condition, and the thermosetting resin impregnated in the canvas is stretched. Is the last step to cure the canvas core and fix the stretched state. The stretching amount in the circumferential direction of the tubular canvas is characterized in that the contraction ratio in the width direction, which is relatively derived from the stretching amount, is set in the range of 7 to 12%.

In both of these inventions, the vertical and horizontal cords are made of aromatic polyamide fiber yarn or polyetheretherketone fiber yarn. further,
The thermosetting resin for curing and fixing the stretched canvas core is characterized by using epoxy or resorcin-formalin latex (RFL).

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of a canvas core for a wide belt and a method of manufacturing the canvas core according to the present invention will be described with reference to the drawings. This canvas core has a remarkable effect when used as a main component of a wide belt constituting one member of a corrugated paperboard manufacturing apparatus.

FIG. 1 is an overall perspective view of a wide belt canvas core embodying the present invention, and a tubular core indicated by phantom lines shows a state before a stretching and fixing process. FIG. 2 is a schematic front view of an apparatus for performing stretching and fixing work on a canvas core.

The wide canvas core 1 according to the present invention has a width 1
It has an extremely wide shape of 200 to 3000 mm and a perimeter of 1,000 to 3500 mm. This canvas core 1
Is made of a low-stretch, high-strength woven canvas, specifically, an aromatic polyamide fiber yarn (also known as aramid fiber yarn), a polyetheretherketone fiber yarn, a polyester fiber yarn, a nylon fiber yarn, or the like, in a tubular shape. Endless woven canvas core 1
Has a seamless shape with no steps in both the circumferential and width directions. Among the fiber yarns, aromatic polyamide fiber yarns and polyetheretherketone fiber yarns are particularly preferable in terms of toughness and heat resistance.

The canvas core body 1 has a cord formed by twisting or twisting long filaments made of the above-mentioned fibers, and twisting a yarn having a fineness of 1000 to 2000 denier per one yarn, and further twisting two to ten yarns. Plain weaving by a cylindrical loom or a loom having equivalent performance,
It is woven in mat, twill or satin. In addition,
Fineness per constituent cord of the canvas core is 1000 to 20
The number of twists of 00 denier yarn is 50 times / m to 10
0 times / m.

The number of the vertical cords 2 corresponding to the circumferential direction of the tubular canvas core and the number of the horizontal cords 3 corresponding to the width direction of the core, that is, the code density is 5c.
The variation of the number of cords is 10 to 50 per m, and the variation of the number of cords is within ± 0.5 over the entire width and the entire length of the canvas core. The local excessive elongation phenomenon and deformation are suppressed.

The twisting direction of the vertical cords 2 corresponding to the circumferential direction of the belt constituting the canvas core body 1 is finally changed by alternately combining the S-direction twisting and the Z-direction twisting for each of the vertical cords. Is designed to suppress the meandering running of the belt in this aspect as well.

The canvas core 1 woven in a tubular shape is immersed in an uncured liquid thermosetting resin, or a liquid thermosetting resin is applied to both the front and back surfaces of the canvas core to provide sufficient thermosetting. Resin 4 is impregnated evenly over the entire surface of the canvas core, and the amount of impregnation of the resin is about 300 to 1000 g / m ² . In addition, the impregnation of the thermosetting resin is an example of such a case.
Formalin latex (RFL) treatment is very common, and both of these resin treatments are rich in toughness and stability.

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

If the contraction rate in the width direction of the canvas core is 7% or less, the completed belt is further contracted in the width direction as the belt tension is increased.
The intended purpose cannot be achieved. Conversely, if the shrinkage rate 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 body circulating and running while maintaining the above-mentioned predetermined stretched state is heated by one side or both side heaters 16, 16 or hot air, and the thermosetting resin 4 is thermoset, and the drum-shaped pulley 15, The tubular fabric 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.
In the range of minutes.

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

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

In the skin canvas 7, a twisted yarn of an aromatic polyamide fiber (also known as a para-aramid fiber or a meta-aramid fiber) and a urethane elastic fiber is coated on a vertical cord 8 corresponding to the belt circumferential direction, and the belt cord is stretched in the belt width direction. Matching horizontal code 9
A plain woven, twill or satin woven canvas using one of aromatic polyamide fiber yarn, nylon fiber yarn and polyester fiber yarn, or a knitted woven canvas using aromatic polyamide fiber yarn. I have.

The surface of the skin 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. 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 an extremely thin belt. As shown, the width is set to 1200 to 3000 mm , the circumference is set to 1000 to 3500 mm , and the thickness is set to 3.5 mm or less.

Next, the tubular fabric core is subjected to a stretching treatment so as to gradually change the width shrinkage of the core including no shrinkage in the width direction of the core. The results of the determination as to whether or not the wide belt 10 is usable due to the width contraction that occurs when the wide belt mainly composed of a body is driven are as follows.

Width shrinkage due to core stretching process Judgment of width shrinkage when using belt 0% 6% × (unsuitable) 1-5% 5% × (unsuitable) 6-8% 3.5% △ (semi-unsuitable) 8 -10% 2.0% ○ (suitable) 10-12% 1.0% ○ (suitable) Width shrinkage rate of core material generated by stretching of canvas core material 7 to
A wide belt using a fabric core in the range of 12% is in actual use, and the width shrinkage of the belt is in the range of 3.0% or less, so that the intended purpose of the wide belt can be achieved. It did not cause a big problem.

[0034]

According to the present invention, a wide and thin wide belt using a tubular canvas core according to the present invention has a unique shape. I have to rely heavily on the fabric core. 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 process in the circumferential direction in advance, and the predetermined stretched state is maintained by a hardening process using a thermosetting resin to maintain the stretched form. By suppressing the occurrence of changes in the width direction of the canvas core due to the immobilization, and thus the extension of the canvas core,
This canvas is stable in shape because it suppresses belt elongation in the circumferential direction and changes in shape in response to changes in tension acting on wide belts, and consequently suppresses shrinkage and shape changes in the belt width direction. A long-term stable use of the wide belt using the core can be ensured.

Further, the stretching process in the circumferential direction of the canvas core body mounted on a plurality of drum-shaped pulleys, and the resulting contraction of the canvas core body in the width direction are substantially equally realized in various parts of the belt. Therefore, it is possible to reliably suppress the occurrence of the circumferential elongation phenomenon of the wide belt using the canvas core, and further prevent the belt from meandering and twisting. In addition, the suppression of the contraction movement of the core body in the width direction has a great effect in securing the stability of the forming and gluing work of the wide corrugated paperboard which is executed in series on the wide belt.

In the case of the wide belt using the canvas core according to the present invention, which is used as one component of the corrugated paper manufacturing apparatus, various operations such as molding and bonding of corrugated paper are directly performed on the belt. Even if the belt is executed and used in a harsh environment, the belt itself can be restrained from elongating and deforming, making it possible to continue accurate work for a long time on the belt. The durability of the belt can be ensured for a long time.

[Brief description of the drawings]

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

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

FIG. 3 is a perspective view of a part of a wide belt mainly including a canvas core 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 cardboard manufacturing apparatus incorporating a wide belt.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 canvas core body 2 vertical cord 3 horizontal cord 4 thermosetting resin 15, 15 drum-shaped pulley 16, 16 heater

──────────────────────────────────────────────────続 き Continuation of the front page (72) Koji Katsura, Inventor 5-3-26 Kisaki, Akashi-shi, Hyogo Sampleta Takasaki 106 (56) References JP-A-6-107311 (JP, A) (58) Field (Int.Cl. ⁶ , DB name) B65G 15/30-15/58 B29D 29/06 D03D 1/00

Claims (18)

(57) [Claims] 1. A wide tubular canvas, which is seamlessly woven in a circumferential direction and a width direction by a vertical cord and a horizontal cord and is in a stretched state in a circumferential direction, is thermoset in which the stretched state is impregnated in the canvas. Fabric core for wide belt fixed by curing of conductive resin. 2. The canvas core for a wide belt according to claim 1, wherein a shrinkage ratio in a canvas width direction relatively derived by circumferential stretching of the tubular canvas is in a range of 7 to 12%. 3. The canvas core for a wide belt according to claim 1, wherein the vertical and horizontal cords constituting the canvas core are made of aromatic polyamide fiber yarn or polyetheretherketone fiber yarn. 4. The cloth core body is one sheet which can cover the entire width of the belt, but the number of cords arranged in a circumferential direction and a width direction by a loom is 10 to 50 per 5 cm, and The variation in the number is ± over the entire width and length.
Of claims 1 to 3, which are woven within 0.5
The canvas core for a wide belt according to any one of the preceding claims. 5. The vertical and horizontal cords constituting the canvas core body are made by twisting or twisting long fiber filaments to further twist two to ten yarns each having a fineness of 1,000 to 2,000 denier. The canvas core for a wide belt according to any one of claims 1 to 4. 6. The twist count of a yarn having a fineness of 1,000 to 2,000 denier per one of vertical and horizontal cords constituting the canvas core body is 50 to 100 times / m. The canvas core for a wide belt according to any one of the above. 7. A twisting direction of a vertical cord corresponding to a circumferential direction of a belt constituting the canvas core body is set alternately for each cord.
7. The method according to claim 1, wherein the direction and the Z direction are repeated.
The canvas core for a wide belt according to any one of the preceding claims. 8. The woven fabric according to claim 1, wherein the woven fabric of the canvas core is woven with any one of plain weave, twill weave, satin weave, and mat weave. Canvas core for wide belt. 9. The canvas core for a wide belt according to claim 1, wherein the thermosetting resin is made of epoxy resin or resorcin formalin latex (RFL). 10. A method for producing a canvas core for a wide belt, comprising the following steps a to d. a. A step in which the core body canvas is woven in a tubular shape by the vertical cords and the horizontal cords, which is seamless and wide in the circumferential direction and the width direction, b. Impregnating a thermosetting resin into a tubular core canvas; c. Placing the resin impregnated core canvas between a plurality of drum-shaped pulleys and extending the canvas in a circumferential direction under the rotating running condition of the canvas; d. A process in which the core fabric is heated under stretching conditions to cure the impregnated thermosetting resin and fix the stretched state of the fabric core. 11. The wide belt according to claim 10, wherein the amount of stretching in the circumferential direction with respect to the tubular canvas is set in a range of 7 to 12% in the shrinkage ratio in the width direction of the canvas accompanying the stretching operation. Method for manufacturing a canvas core. 12. The vertical and horizontal cords constituting the fabric core are made of aromatic polyamide fiber yarn or polyetheretherketone fiber yarn.
1. A method for producing a canvas core for a wide belt. 13. The cloth core body may be one sheet which can cover the entire width of the belt, but the density of cords arranged in the circumferential direction and the width direction by a loom is 10 to 50 per 5 cm.
13. The method of manufacturing a wide belt canvas core according to any one of claims 10 to 12, wherein the variation in the number of cords is woven within ± 0.5 over the entire width and length. . 14. The vertical and horizontal cords constituting the canvas core body are made by aligning or twisting long fiber filaments.
A yarn having a fineness of 1000 to 2000 denier per strand is further twisted by 2 to 10 yarns.
3. The method for manufacturing a canvas core for a wide belt according to any one of the items 3. 15. A yarn having a fineness of 1,000 to 2,000 denier per one of vertical and horizontal cords constituting said canvas core body, wherein the number of twists of the yarn is 50 to 100 times / m. The method for producing a canvas core for a wide belt according to any one of the above. 16. A twisting direction of a vertical cord corresponding to a circumferential direction of a belt constituting the canvas core body is alternately repeated in the S direction and the Z direction for each cord. 2. The method for producing a canvas core for a wide belt according to claim 1. 17. The woven structure of the canvas core is plain weave, twill weave,
The method for producing a wide belt canvas core according to any one of claims 10 to 16, wherein the canvas core is woven with one of a satin weave and a mat weave. 18. The method according to claim 10, wherein the thermosetting resin is made of epoxy resin or resorcin formalin latex (RFL).