JPH11207836A - Press belt for corrugation and production of corrugated article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a press belt for corrugation which is almost free from troubles and has a long service life even under severe conditions of corrugation and a method for producing a corrugated article by using the belt. SOLUTION: Basic layer constitution in which an adhesive layer 2 (additionally as required, a rigid sheet 4) are placed between fabrics 1 is provided, the fabrics 1 consist of seamless fabrics fabricated from heat resistant, high strength fiber [especially poly(p-phenylenebenzo-bis(oxazol) fiber] codes, the seamless fabrics are formed from codes of substantially equal thickness, and at least the fabric 1 on the surface side out of the fabrics located on the surface side and back side of a belt are coated with a fluororesin or a fluororesin- impregnated layer 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressing belt for pressing a sheet to be processed to a step roll during corrugating. The present invention also relates to a method for manufacturing a corrugated product using the pressure contact belt.

[0002]

2. Description of the Related Art <Corresponding press roll method and press contact belt method> When manufacturing corrugated cardboard by corrugating, the core is fed to a pair of corrugated rolls, and the corrugated core is processed. In addition, a method is employed in which a paste is applied to the crest portion by pressing, and a liner is abutted and pressed by a press roll (hereinafter, referred to as a press roll method).

Recently, a method in which a belt is pressed into contact with a step roll on the side to be pasted, and a liner is fed between the step roll and the belt from above a stepped core to bond them together. (Referred to as a pressure contact belt system).

<Documents relating to pressure belt system> The latter pressure belt system is disclosed in JP-A-59-124842, JP-A-4-305443, and JP-A-5-32.
9966, JP-A-6-8360, JP-A-6
-55,675, JP-A-6-297614,
JP-A-6-305060, JP-A-7-12511
No. 4, No. 4, for example.

Japanese Patent Application Laid-Open No. 7-60877 discloses a wide belt mainly used in a pressure contact belt system. Japanese Patent Application Laid-Open No. 7-60877 discloses an endless canvas core that is seamless in both the longitudinal and width directions of the belt. A wide belt having a structure in which a surface canvas having elasticity in the longitudinal direction of the belt is coated on the surface side with a coating layer having excellent releasability via a heat-resistant elastomer layer on the surface side. ing. The layer configuration at this time is “coating layer / skin fabric having elasticity in the belt longitudinal direction / heat-resistant elastomer layer / canvas core body seamless in both longitudinal and width directions of the belt”.

The vertical and horizontal cords (longitudinal length of the belt and widthwise of the belt) constituting the fabric core of the wide belt are typically made of aromatic polyamide fiber yarn or polyether ether. 1000-2000 denier yarn composed of ketone fiber yarn is further added to 2-20
It is made by main twisting. It is preferable that the twisting direction of the vertical cords alternately repeats the S direction and the Z direction for each cord. The number of vertical codes and the number of horizontal codes (code density) are 10 to 50/5 cm.

[0007] A skin canvas having elasticity in the belt longitudinal direction in the wide belt is (a) a twisted yarn of an aromatic polyamide fiber yarn and a urethane elastic fiber is used for a vertical cord (cord corresponding to the longitudinal circumferential direction of the belt). It is a woven fabric using aromatic polyamide fiber yarn, nylon fiber yarn or polyester fiber yarn for the horizontal cord (cord that matches the width direction of the belt), or (ii) knitted fabric using aromatic polyamide fiber yarn It is.

[0008] The specific numerical value of the vertical cord of the skin is 100 to 300 in the case of para-aramid fiber yarn.
In the case of denier, the number of twists is 1 to 3, the meta-aramid fiber yarn is spun yarn 20 to 40, the number of twists is 1 to 4, and is a twisted yarn with urethane elastic fiber yarn 140 denier / 1. Is 100 to 140 lines / 5 cm. The specific values for the lateral cord of the outer canvas are, in the case of a para-aramid fiber yarn, a thickness of 100 to 300 denier, a number of twists of 1 to 3, and in the case of a meta-aramid fiber yarn,
The spun yarn count 40, the number of twists is 1 to 4, and in the case of nylon fiber yarn or polyester fiber yarn, the thickness is 100 to 3
00 denier, 1 to 3 twists, and 70 to 100/5 cm. By using elastic fiber yarn for a part of the vertical cord, its elongation is 100
% Or more.

<Heat-resistant laminated conveyor belt disclosed in Japanese Utility Model Laid-Open No. 6-63536> Although there is no mention of corrugating, it is disclosed in Japanese Utility Model Laid-Open No. 6-63536, for example, as to a conveyor belt used in a paper feeding process. Is a heat-resistant fiber base material impregnated with a fluororesin, dried and sintered, and a reinforcing cloth formed on this reinforcement layer and knitted with heat-resistant fibers impregnated with the fluororesin, dried and sintered. And a heat-resistant laminated conveyor belt provided with a stretchable wear-resistant layer. The heat-resistant fiber of the wear-resistant layer is wavy,
There is also a description that a non-woven fabric made of short fibers with spring-like expansion and contraction may be used.

Japanese Utility Model Laid-Open Publication No. Hei 6-63536 discloses that a belt material having the same weave is laminated via a PFA film as a description of the prior art. There is no description about the use of a seamless woven fabric, and this conventional structure has the drawback that the layers are easily separated at the interface.

[0011]

A pressure contact belt for corrugating is used under extremely severe conditions. That is, it is used in a high-temperature environment and is used for high-speed traveling
An extremely large tensile force is applied, the vibration is large, and the object to be pressed is uneven. When the width of the sheet to be processed is narrower than that of the step roll, portions of a considerable width on both sides of the pressing belt come into direct contact with the step roll. Further, since the posture of the pressure contact belt is frequently controlled in conjunction with the sensor so that the pressure contact belt does not meander, a force is exerted on the pressure contact belt just to squeeze the pressure contact belt. For this reason, the belt is likely to be wrinkled in the width direction of the belt, easily causing misalignment, and furthermore, the glue used for bonding adheres.

Conventionally, steel belts have been used as corrugating belts by the pressure contact belt system. However, there is a risk of causing human damage when the belt is cut at a frequency that is not rare. Occasionally, damage to the apparatus is large, and steel belts are inherently limited in terms of flex fatigue resistance.

Japanese Patent Application Laid-Open No. 7-60877 discloses a wide belt having the structure of "coating layer / skin fabric having elasticity in the longitudinal direction of belt / heat-resistant elastomer layer / canvas core body seamless in both longitudinal and width directions of belt". In the case of, the delamination between the canvas core body and the skin canvas due to the vibration during corrugating is intended to be prevented by using a canvas having elasticity in the belt longitudinal direction as the skin canvas, but in terms of belt life. There is room for improvement. This is because most of the belt strength depends only on the canvas core, and the expansion and contraction operation of only the skin canvas is remarkable, and the thickness of the cord used for the canvas core and the skin canvas is significantly different,
This is probably because the corrugated canvas (having elasticity) and the canvas core body operate independently during corrugation, and lack interlocking properties to cover each other's weak points. Further, in order to obtain a necessary belt strength (for example, 1 t / cm 2), the momentum cord must be thickened. However, if a thick cord is used, the cord may be cracked during corrugating. Furthermore, in this wide belt, the canvas core is seamless, but the seamless canvas is bonded to the canvas core without steps by a heat-resistant elastomer layer by making it seamless. Is not seamless and has problems in terms of belt strength, uniformity, and manufacturing process.

The base cloth in which heat-resistant fibers are knit-woven is impregnated with a fluororesin, dried and sintered, and a wear-resistant layer composed of a wear-resistant layer provided with elasticity / a heat-resistant fiber base material is impregnated with the fluororesin. Japanese Utility Model Laid-Open No. 6-635 having a configuration of "a dried and sintered reinforcing layer"
In the heat-resistant laminated conveyor belt disclosed in Japanese Patent Publication No. 36, even if this is applied to a corrugating belt, the abrasion-resistant layer and the elastic reinforcing layer each operate independently to cover each other's weak points. Such interlocking is poor. Further, according to the description of the embodiment, since the heat-resistant laminated conveyor belt has an abrasion-resistant layer, which is an upper layer, made endless by bonding, it also has problems in strength, uniformity, and a manufacturing process of the belt. .

Under such a background, the present invention provides a pressure contact belt for corrugating which has no trouble and has a long service life despite being used under extremely severe conditions of corrugating. It is another object of the present invention to provide a method for manufacturing a corrugated product using the pressure contact belt.

[0016]

The corrugating press belt of the present invention is a woven fabric belt for pressing a sheet to be processed on a step roll during corrugating, and the belt comprises a plurality of belts. It has a basic layer structure with an adhesive layer (2) interposed between woven fabrics (1), and each of the multiple woven fabrics (1) uses a cord made of heat-resistant high-strength fiber yarn. The seamless woven fabric shall be woven with cords of substantially the same thickness, and the woven fabric (1) located on the front and back sides of the belt shall be woven. At least the woven fabric on the front side (1
A) is characterized in that a coating or impregnation layer (3) with a fluorine resin is provided.

In this case, in addition to the adhesive layer (2), a rigid sheet (4) is preferably interposed between the plurality of woven fabrics (1) in order to further improve the rigidity in the belt width direction. .

The method for producing a corrugated product according to the present invention comprises:
A corrugated product is manufactured by pressing a sheet to be processed onto a corrugator step roll using the above-mentioned pressing belt.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.

<Basic Layer Structure> The pressure contact belt of the present invention
It has a basic layer structure in which an adhesive layer (2) is interposed between a plurality of woven fabrics (1). The number of the woven fabrics (1) is optimally two, but may be three or more in some cases.

<A plurality of woven fabrics (1)> In the present invention,
Each of the plurality of woven fabrics (1) is a seamless woven fabric woven using a cord made of heat-resistant high-strength fiber yarn. A seamless woven fabric is a woven fabric that is seamless in the circumferential direction. The weaving structure may be a plain weaving structure, an oblique weaving (twill weaving) structure, a satin weaving structure, a change weaving structure thereof, or the like. The seamless woven fabric can be manufactured by the following method.

That is, if weaving is performed by the weaving method using the warp and the weft, a seamless (seamless)
A tubular woven fabric can be manufactured. Bag weaving is a method of arranging warp into front warp and back warp, and forming a single ring by reciprocating the weft two times to form a tubular shape sequentially. Done. When the bag weaving method is adopted, the warp during weaving becomes a running yarn in the width direction of the seamless woven fabric, and the weft during weaving becomes a running yarn in the circumferential direction (radial direction) of the seamless woven fabric. If the obtained tubular bag fabric is cut in the radial direction, a seamless woven fabric having a desired size can be obtained.

A seamless woven fabric can also be manufactured by weft-inserting a width-direction running yarn into a circumferentially-running yarn that has been warped in a skein shape in advance. In the last stage of weaving, it is difficult to make an opening, so that weaving may be completed at the end by hand if necessary.

The heat-resistant and high-strength fiber yarn used in the production of the woven fabric (1) is polyparaphenylene having a high tensile strength of, for example, 42 g / d, a high heat resistance of, for example, 650 ° C., and a very high wear resistance. Benzobisoxazole fiber yarns are particularly important (1000 denier cord
If used at 10 mm, the belt strength far exceeding 1 t / cm can be obtained with two woven fabrics (1)), and aramid fiber yarn is also important, and polyetheretherketone fiber,
Threads made of polyamide imide fibers, polyimide fibers, liquid crystal polyester fibers, and the like can also be used. In addition to these synthetic fiber yarns, for example, metal fibers (stainless steel fibers, shape memory alloys, etc.), ceramic fibers,
A yarn made of glass fiber, carbon fiber, or the like can also be used. As the heat-resistant and high-strength fiber yarns, literally, an appropriate one should be selected from the viewpoint of having heat resistance and high strength. The heat-resistant and high-strength fiber yarn is preferably a monofilament or a multifilament made of a long fiber. In the case of a monofilament, a plurality of filaments can be used by aligning or twisting. A slit yarn obtained by slitting a film can also be used. In addition, a fiber obtained by cutting a filament into an appropriate length and twisting the filament to impart fluff, such as a woolen yarn, is also preferably used.

The above heat-resistant and high-strength fiber yarns are aligned or twisted in an appropriate number, and if necessary, re-twisted or re-aligned, and are subjected to about 500 to 8000 denier, preferably about 500 to 4000 denier. It is more preferably used as a cord having a thickness of about 500 to 3000 denier. In this case, misalignment is less likely to occur when used for corrugating as the thickness is smaller. Therefore, in the above range, about 500 to 3000 denier, usually about 600 to 2500 denier, and further 700 to 20 denier.
It is particularly preferable to use a relatively fine cord, such as about 00 denier, particularly about 800 to 1500 denier. In particular, when a polyparaphenylene benzobisoxazole fiber yarn is used, sufficient strength and abrasion resistance can be obtained even with about 700 to 2000 denier, especially about 800 to 1500 denier.

In the present invention, a plurality of woven fabrics
All seamless woven fabrics constituting (1) are woven with cords of substantially the same thickness. “Substantially the same thickness” means that a difference of up to about ± 50%, preferably up to about ± 20%, especially up to about ± 10% is acceptable. The thicknesses of the warp and the weft during weaving may be the same or different, but are usually set to be substantially the same. A typical example is that multiple woven fabrics
(1) When woven cloth (1A) and woven cloth (1B)
(1A) uses n denier cord for both warp and weft,
The woven fabric (1B) also uses an n-denier cord for both the warp and the weft. Here, n denier is, for example, 1000 denier or 1500 denier. Warp and for example n ₁ denier thickness of the weft during weaving, when different from the n ₂ denier, any of a plurality of fabric (1), for example, n ₁ denier being substantially equal to the warp those of thickness, the weft it is desirable to use those of the n ₂ denier substantially comparable thickness.

When weaving the woven fabric (1), an S-twisted cord and a Z-burning cord are arranged in a well-balanced manner as wefts at the time of weaving, which are running yarns in the circumferential direction of the belt, and each woven fabric is individually woven.
It is desirable to configure (1). To arrange in a well-balanced manner means, for example, that SZS
.., SSZZSSZZ..., And other various variations. Alternatively, a woven fabric produced by using an S-twisted cord as a weft at the time of weaving, which is a circumferential running yarn of the belt.
It is also desirable to combine the (1) and the woven fabric (1) produced using the Z-burning cord in a well-balanced manner to form a plurality of woven fabrics (1).

The plurality of woven fabrics (1) constituting the belt are designed so that the inner woven fabric (1) has a slightly shorter circumferential length. This can be easily achieved by reducing the number of warp yarns at the time of weaving so that the number of the woven cloth (1) arranged on the inside is one or several less than that of the woven cloth (1) arranged on the outside.

<Adhesive Layer (2)> An adhesive layer (2) is interposed between the plurality of woven fabrics (1) to integrate the woven fabrics (1). (1) / (2) / (1) when there are two woven fabrics (1)
, When there are three woven fabrics (1), (1) / (2) / (1) / (2) / (1)
Becomes

As the adhesive layer (2), a layer having heat resistance and adhesiveness is used. A film layer of a fluororesin, particularly, a tetrafluoroethylene-perfluoroalkylvinyl ether copolymer (PFA) or A film layer of a tetrafluoroethylene-hexafluoropropylene copolymer (FEP), particularly the former PFA film layer, is desirable. When a fluorine resin film layer is used as the adhesive layer (2), one or more films can be used.

<Coating or impregnated layer (3)> Further, in the present invention, the woven fabric located on the front side and the back side of the belt
At least the woven fabric (1) on the surface side of (1) is provided with a coating or impregnation layer (3) with a fluororesin at an appropriate stage.

When the fluororesin coating layer is provided on the front side (or the front side and the back side) of the woven fabric (1), the PF is placed on the woven fabric (which may be a belt).
A, FEP, melting a heat-resistant composition containing a large amount of a powder of such a fluorine-based resin such as PTFE or a fluorine-based resin,
Coated as a solution or dispersion, or PFA,
A method of coating a fluorine-based resin film such as FEP or a half-melted fluorine resin film and thermocompression bonding is adopted. In addition, a method in which a raw PTFE film is coated and then baked at an appropriate stage at a temperature of about 350 to 400 ° C. under pressure is also applicable. Coating or impregnated layer with fluorine resin
(3) may be a single layer or a plurality of layers.

When the impregnated layer of the fluororesin is provided on the woven fabric (1) on the front side (or the front side and the back side),
Solution or dispersion of fluororesin (dispersion)
Is impregnated into a woven fabric (which may be after forming a belt), dried, heat-treated or sintered (sintered) once or more times. Fluorine resin is P
When processing the dispersion of TFE, if it is applied thickly at one time, mud cracks will be generated by drying. Therefore, the amount of adhesion per one time should be about 20 μm or less in terms of the resin thickness after baking, and immersion-drying-firing. Is repeated to obtain a desired thickness, and the firing temperature at this time is often about 350 to 400 ° C.

As a special method, when weaving the woven fabric (1) on the front side (or the front side and the back side), as a heat-resistant high-strength fiber yarn, a fluororesin yarn (especially a film yarn) is used. If we use a covering yarn that has been covered, a twisted yarn obtained by twisting a fluororesin yarn, or a heat-resistant high-strength fiber yarn in combination with a fluororesin yarn, heating after weaving will be at or above the melting point of the fluororesin. As the fluororesin yarn flows by the treatment, the vertical and horizontal structures constituting the belt are fused and integrated, so forming a fluororesin coating or impregnated layer (3) on the woven fabric (1) Can be. At this time, PFA or FEP is suitable as the fluororesin.

<Rigid sheet (4)> In addition to the above-mentioned adhesive layer (2), a rigid sheet (4) is provided between a plurality of woven fabrics (1).
It is also preferable to intervene.

Examples of the rigid sheet (4) include metal wire (stainless steel wire, iron wire, shape memory alloy wire, etc.), ceramic fiber, glass fiber, carbon fiber, synthetic fiber (polyparaphenylene benzobisoxazole fiber, aramid). Fibrous sheet) (woven fabric, non-woven fabric, knit, etc.), and a planar sheet made of stainless steel wire is particularly important. The first role of the rigid sheet (4) is to secure the rigidity in the width direction of the belt. Therefore, if the above-described rigid yarn is used for the yarn (cord) directed in the width direction of the belt, The yarns running in the circumferential direction of the belt may have low rigidity (for example, when weaving blinds).

The rigid sheet (4) may be common in material to the woven fabric (1) described above. However, the heat-resistant and high-strength fiber yarns constituting the woven fabric (1) are selected from the viewpoint of having heat resistance and high strength.
Is, at least from the viewpoint of having rigidity in the width direction,
The type, thickness, density, weaving method, sheeting method, and the like of the material are determined.

The basic structure when a rigid sheet (4) is interposed between a plurality of woven fabrics (1) in addition to the adhesive layer (2) is, for example, (1) / (2) / (4) / ( 2) / (1), and the coating or impregnating layer (3) is disposed on at least one side.

<Additional Layer> If necessary, other layers can be added to the press-contact belt thus obtained. For example, at an appropriate stage from the back side of the belt impregnated with a curable resin such as a polyimide resin prepolymer,
It can be cured by curing.

<Sewing machine sewing> At the stage where the adhesive belt (2) (and the rigid sheet (4)) is interposed between a plurality of woven fabrics (1), or at the stage where the pressure contact belt is obtained, At the stage where the impregnation layer (3) and other additional layers are provided, it is preferable to further perform sewing with a suitable interval or pattern to sew between the plurality of woven fabrics (1). By sewing, the integration between the plurality of woven fabrics (1) through the adhesive layer (2) (and the rigid sheet (4)) and the fraying of the both ear ends of the woven fabric (1) are further improved. This is because it can be effectively prevented.

<Pressing Belt, Corrugating> In the present invention, the pressing belt is used as a belt for pressing a sheet to be processed on a step roll during corrugating.
That is, it is used as a belt for laminating the liner from above the stepped core.

The dimensions of the pressure contact belt vary depending on the dimensions of the corrugator step rolls and the space between the rolls.
For example, the width is about 1200-3000 mm and the circumference is 20
In most cases, it is about 00 mm or more.

FIG. 8 is a schematic view showing an example of a corrugator for producing cardboard. In FIG. 8, (5) is one stage roll, (6) is the other stage roll, (7) is a gluing device,
(8) is the core and (9) is the liner. The pressing belt of the present invention is pressed against one of the step rolls (5) in FIG. 8 via the center core (8) and the liner (9) after the step processing.

<Operation> In the pressure contact belt having the above structure, the required toughness can be obtained by using a plurality of woven fabrics (1).
In other words, each of the plurality of woven fabrics (1) is made of a seamless woven fabric woven using a cord made of heat-resistant high-strength fiber yarn (it is seamless and therefore uniform over the entire circumference). Is also woven with cords of substantially the same thickness, so that it exhibits essentially the same behavior during corrugation and has a mutually reinforcing relationship, so that vibrations and sideways applied during corrugation are Interfacial separation between woven fabrics (1) and woven fabric
(1) It is difficult to cause troubles such as cracks, wrinkles, misalignment, etc. for a long time. Furthermore, when sewing is performed on a sewing machine that stitches between a plurality of woven fabrics (1), the sewing machine becomes more durable. For example, when using a cord having a thickness of about 700 to 2000 deniers), a more preferable result is obtained in terms of preventing misalignment, and the durability is further improved. Particularly favorable results are obtained when polyparaphenylene benzobisoxazole fiber yarn, which has extremely excellent tensile strength, heat resistance and abrasion resistance, is used as the heat-resistant high-strength fiber yarn used in the production of the woven fabric (1). can get.

When a rigid sheet (4) is interposed between a plurality of woven fabrics (1) in addition to the adhesive layer (2), a rigid layer exists on the core and the rigidity in the belt width direction is increased. Is further strengthened, so that the belt does not wrinkle even if corrugating is continued, which is further advantageous in terms of the life of the belt.

In addition, among the woven cloths (1) located on the front side and the back side of the belt, at least the woven cloth on the front side is provided with a coating or impregnated layer (3) made of a fluorine-based resin. In addition, the adhesive used for corrugating is less adhered because of its high abrasion resistance and is non-adhesive, and the adhered adhesive can be easily removed.

As described above, although the pressure contact belt of the present invention is extremely tough and used under extremely severe conditions for corrugating, troubles such as cutting, breakage, wrinkling, misalignment and the like may occur. It has a long life. Such excellent durability cannot be obtained by arranging a stretchable material on the surface side of a woven fabric serving as a core as in the related art. Also, even when two woven fabrics are used, non-seamless woven fabrics are used, or when two woven fabrics that are woven with cords of substantially the same thickness are not used. However, such excellent durability cannot be obtained.

[0048]

The present invention will be further described with reference to the following examples.

Embodiment 1 FIG. 1 is a perspective view schematically showing one example of a pressure contact belt of the present invention. FIG. 2 is a schematic sectional view of the press contact belt of FIG. FIG. 3 shows the woven fabric (1) used in the pressure contact belt of FIG.
FIG. 3 is a schematic plan view of FIG.

Polyparaphenylene benzo as an example of a heat-resistant and high-strength fiber yarn, as a warp (to be a running yarn in the width direction of the press-contact belt) and a weft (to be a running yarn in the circumferential direction of the press-contact belt) during bag weaving and weaving. Twisted bisoxazole fiber yarns (tensile strength: 42 g / d) were further twisted or aligned in a predetermined number to use a cord having a thickness of 1000 denier. A wide tubular seamless woven fabric was woven using the above-mentioned warp and weft by a bag weaving method (the number of cords of 1000 denier was 16 /
10 mm). However, the weft was used for weft insertion using two S-twisted and Z-twisted cords as shown in FIG. The thus obtained seamless woven fabric is cut into a predetermined width in the radial direction, and the woven fabric is arranged on the back side and the front side.
Used as (1). In addition, the woven fabric (1) arranged on the back side
In the weaving, the number of warp yarns was reduced by two compared to the woven fabric (1) arranged on the surface side.

The back side woven fabric (1) obtained above is suspended between the rolls, and a thickness of 10 as an adhesive layer (2) is formed thereon.
After winding a 0 μm PFA film (for example, 2 to 5
The woven fabric (1) on the surface side from the outside was fitted, and the whole was thermocompression-bonded at a temperature equal to or higher than the melting point of PFA. As a result, a tubular body having the basic layer structure of the back side woven fabric (1) / adhesive layer (2) / front side woven fabric (1) was obtained. In addition, sewing was performed in the circumferential direction at regular intervals using aramid fiber yarn. The interval between the stitches near the ends of both ears was made tighter than in other areas. (S) in FIG. 1 is a seam.

Then, the PFA film is rolled and covered (for example, about 1 to 2 turns) in a semi-molten state on the woven cloth (1) on the front side of the cylindrical body, and then the belt is turned inside and outside to reverse. The PFA film is also semi-molten and roll-coated (for example, about 1 to 2 turns) from above the woven fabric (1), and the whole is thermocompressed at a temperature equal to or higher than the melting point of PFA, and then allowed to cool. A coating or impregnated layer (in this case, a coating layer) (3) with PFA was formed on both surfaces of the substrate.

Thus, a pressure contact belt having a structure of coating layer (3) / woven cloth (1) / adhesive layer (2) / woven cloth (1) / coating layer (3) was obtained. This pressure contact belt was extremely tough against pulling, had favorable width rigidity, high heat resistance, and had a non-adhesive surface and abrasion resistance.

This press-contact belt is used as a press-contact belt (press-contact belt for bonding a liner from above the step-processed core) to press the sheet to be processed on the step roll during corrugating, as shown in FIG. When the corrugated cardboard was manufactured in this way, it was possible to perform smooth crimping, and also to remove the interface between the woven fabrics (1) and the cords that make up the woven fabric (1) due to the vibration and lateral stress applied during corrugating. No troubles such as cracks, wrinkles or misalignment occurred over a long period of time, and the service life of the belt was much longer than that of a press-contact belt used in the market.

Embodiment 2 FIG. 4 is a schematic sectional view of another example of the press contact belt of the present invention.

An aramid fiber yarn as an example of a heat-resistant and high-strength fiber yarn is used as a warp (to be a running yarn in the width direction of the press-contact belt) and a weft (to be a running yarn in the circumferential direction of the press-contact belt) during bag weaving and weaving. A cord having a thickness of 2000 deniers obtained by further twisting the twisted ones in a predetermined number was used. Using the above-mentioned warp and weft, a wide tubular seamless woven fabric was woven by a bag weaving method (the number of cords of 2000 denier is 12/10 mm).
However, the weft was used for weft insertion using two S-twisted and Z-twisted cords as shown in FIG. The seamless woven fabric thus obtained was cut into a predetermined width in the radial direction, and used as a woven fabric (1) arranged on the back side and the front side. The woven fabric (1) arranged on the back side has two warps more than the woven fabric (1) arranged on the front side in weaving.
I reduced this book.

Hereinafter, according to Example 1, except that the woven fabric (1)
As shown in FIG. 4, the coating layer (3) / woven fabric (1) was used.
/ Adhesive layer (2) / Woven cloth (1) / Adhesive layer (2) / Woven cloth (1) /
A pressure contact belt having the structure of the coating layer (3) was produced. As in the case of Example 1, this pressure contact belt is extremely tough against tension, has a preferable width rigidity, has high heat resistance,
Moreover, the surface was non-adhesive and had abrasion resistance.

Embodiment 3 FIG. 5 is a schematic sectional view of still another example of the press contact belt of the present invention. FIG. 6 is a schematic plan view of the woven fabric (1) used in the pressure contact belt of FIG.

As the upper and lower woven fabrics (1) in Example 2, the woven fabric (1) made of the polyparaphenylene benzobisoxazole fiber yarn in Example 1 was used.
The woven fabric (1) as the intermediate layer in was made of stainless steel wire (or carbon fiber yarn or glass fiber yarn) in the belt width direction and aramid fiber yarn (or polytetrafluoroethylene yarn) in the belt circumferential direction. It was replaced with a rigid sheet (4) made of woven fabric. Thereby, as shown in FIG. 5, the covering layer (3) / woven fabric (1) / adhesive layer (2) / rigid sheet
A pressure contact belt having a structure of (4) / adhesive layer (2) / woven fabric (1) / coating layer (3) was obtained.

Since the pressure contact belt has better width rigidity than that of the first embodiment, it is more durable in terms of belt life. Further, it was extremely tough against pulling, had high heat resistance, and had a non-adhesive surface and abrasion resistance.

Embodiment 4 FIG. 7 is a schematic sectional view of still another example of the press contact belt of the present invention.

In the fourth embodiment, the third embodiment is basically repeated, except that the upper and lower woven fabrics (1) of the upper and lower woven fabrics (1) made of polyparaphenylene benzobisoxazole fiber yarns. The weaving was performed by weft-inserting an S-twisted cord as weft, and the lower woven fabric (1) was weaving by inserting a Z-twisted cord as weft. The pressing belt thus obtained also had excellent performance similar to that of Example 3.

Comparative Example 1 Aramid fiber yarn having a thickness of 60 as the warp and the weft
Woven cloth arranged on the back side using 00 denier cord
(1) was obtained, and a woven fabric (1) to be disposed on the surface side was obtained by using a cord of 1000 denier made of aramid fiber yarn as the warp and the weft. Other conditions were the same as those in Example 1 to produce a pressure contact belt. However, this pressure contact belt is more likely to cause misalignment than the pressure contact belt obtained in Example 1 and has an excellent durability. Did not.

Comparative Example 2 Thickness of 10 made of aramid fiber yarn as warp and weft
Using a 00 denier cord, a flat woven fabric was obtained by an ordinary weaving method, cut into a predetermined width in the length direction, and then joined at both ends to form an endless belt. In this case, the warp yarn (two S-twisted and Z-twisted cords are used in parallel) is used as a running yarn in the circumferential direction of the endless belt,
The weft becomes the widthwise running yarn of the endless belt. The other conditions were the same as in Example 1. A pressure contact belt was produced. However, since the pressure contact belt did not use a seamless woven fabric, the durability was significantly inferior to the pressure contact belt obtained in Example 1. Was.

[0065]

As described in detail in the section of operation, the pressure contact belt of the present invention is extremely tough, and although it is used under extremely severe conditions for corrugating,
It is hard to cause troubles such as cutting, breakage, wrinkling, misalignment, etc., and has a long life.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing an example of a pressure contact belt of the present invention.

FIG. 2 is a schematic sectional view of the press contact belt of FIG.

FIG. 3 is a schematic plan view of a woven fabric (1) used in the pressure contact belt of FIG.

FIG. 4 is a schematic sectional view of another example of the press contact belt of the present invention.

FIG. 5 is a schematic sectional view of still another example of the press contact belt of the present invention.

FIG. 6 is a schematic plan view of a woven fabric (1) used in the pressure contact belt of FIG.

FIG. 7 is a schematic sectional view of still another example of the press contact belt of the present invention.

FIG. 8 is a schematic view showing an example of a corrugator for manufacturing corrugated cardboard.

[Explanation of symbols]

 (1) ... woven fabric, (2) ... adhesive layer, (3) ... covering or impregnating layer, (4) ... rigid sheet, (5) ... one step roll, (6) ... the other step roll, (7) ... gluing device, (8) ... core, (9) ... liner, (s) ... seam

Claims (8)

[Claims] A woven fabric belt for pressing a sheet to be processed against a step roll during corrugating, wherein the belt has an adhesive layer (2) interposed between a plurality of woven fabrics (1). Each of the plurality of woven fabrics (1) consists of a seamless woven fabric woven using a cord made of heat-resistant high-strength fiber yarn, and any of the seamless woven fabrics Woven with cords of substantially the same thickness, and woven fabrics located on the front and back sides of the belt
A pressure-contact belt for corrugating, characterized in that at least the woven fabric (1) on the surface side of (1) is provided with a coating or impregnated layer (3) of a fluororesin. 2. A pressure contact belt according to claim 1, wherein a rigid sheet (4) is interposed between the plurality of woven fabrics (1) in addition to the adhesive layer (2). 3. The pressure contact belt according to claim 1, wherein the heat-resistant and high-strength fiber yarns constituting the plurality of woven fabrics (1) are polyparaphenylene benzobisoxazole fibers. 4. An individual woven fabric (1) comprising a well-balanced arrangement of S-twisted cords and Z-burning cords as wefts at the time of weaving, which are running yarns in the circumferential direction of the belt. A plurality of woven fabrics (1) produced using an S-twisted cord and a woven fabric (1) produced using a Z-twisted cord as wefts at the time of weaving, which are circumferential running yarns, are combined in a well-balanced manner. The pressure contact belt according to claim 1, wherein the woven fabric (1) is used. A plurality of woven fabrics (1) constituting a belt control the number of warp yarns at the time of weaving so that the inner woven fabric (1) has a larger circumference than the outer woven fabric (1). 2. The pressure contact belt according to claim 1, wherein the length is designed to be slightly shorter. 6. The pressure contact belt according to claim 1, wherein the adhesive layer (2) is a film layer of a fluororesin. 7. A sewing machine for sewing a plurality of woven fabrics (1) at appropriate intervals or patterns.
The pressing belt described. 8. A method for manufacturing a corrugated product, comprising: pressing a sheet to be processed onto a corrugator step roll using the pressure-contact belt according to claim 1.