JP2002211727A - Conveyor belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conveyor belt having high strong power, excellent dimensional/shape stability, excellent high speed rectilinear property, excellent fatigue resistance/wear resistance and excellent breakage/deterioration resistance at both end lug parts without generation of noise and generation of press marks. SOLUTION: This conveyor belt coating synthetic resin having releasing performance in endless multiple woven fabric made of multifilament yarn made of aromatic para-aramid resin or multifilament yarn made of polybenzazole class resin such as polyparaphenylene benzbisoxazole(PBO) and polybenzimidazole(PBI) is made by inserting stainless filament at both end lug parts of the surface layer of the woven fabric, performing an overlock stitch with stainless filament machine-sewing thread or abutting thin tapes inserted with the stainless filament on the lug parts and sewing the tapes with stainless machine-sewing thread.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conveyor belt, and more particularly to a pressure belt used as a part of a corrugating machine of a corrugated paperboard production line.

[0002]

2. Description of the Related Art As a conventional corrugated cardboard manufacturing apparatus / method, corrugated corrugated core paper is formed between a pair of toothed rolls meshing with each other, and the corrugated corrugated corrugated core paper is brought into contact with the step top. The adhesive liquid is applied via the application roll of the adhesive application device, and the corrugated mold on the toothed roll surface on the side in contact with the application roll of the adhesive application device is applied, and the step of the core paper coated with the adhesive is performed. At the top, a part of the pressing conveyor belt mechanism suspended between a pair of rolls equipped with a heating device was arranged so as to be pressed in an arc-shaped pressing state, and the liner paper was corrugated using the conveyor belt. The core paper is fed so as to be pressed against the top of the step where the adhesive has been applied, and is pressed and bonded with the pressure applied between the toothed roll and the pressure conveyor to ensure corrugation and secure the corrugated board. It has been manufacturing paper.

[0003] Such a method of manufacturing a corrugated cardboard using a pressure belt system produces less vibration and noise and provides excellent productivity, as compared with a manufacturing method using a conventional batch system and a manufacturing method using a press roll system. However, in the early stages of its development and commercialization, the liner paper was pressed against the corrugated, adhesive-coated core paper with a certain pressure, and heated and heated to complete the mold setting set and adhesive drying and bonding. In order to maintain a constant high pressing force, the conveyor belt mechanism for pressurizing requires an extremely high tension load, and as a conveyor belt material that meets the required function of not deforming or displacing under such high tension. In the early days, steel belts were used and devices using steel belts were used.

However, in an apparatus using a steel belt, the steel belt has high bending rigidity, and a toothed roll surface of a pair of molding gear rolls for corrugating the apparatus in contact with the application roll of the adhesive application apparatus. The liner paper, which is sent on a steel belt inevitably, comes in contact with the top of the crown and moves while maintaining an arcuate state. Since the corrugated paper is manufactured by keeping the arc shape and being bonded and transferred, the corrugated paper eventually becomes wavy when it is straightened,
In addition, since a very high tension is applied to bring the steel belt of high bending rigidity into close contact with the corrugating mold toothing roll, an excessive contact pressure is applied to the contact pressure surface at the top of the tooth roll, so-called press marks are formed. There is a problem that it is likely to occur, and the whole equipment is large, and there is also a problem in terms of durability due to bending fatigue, and there is a possibility of accidental injury due to unexpected belt cutting. I was

[0005] Such a problem is that the conveyor belt is thin,
The problem can be solved by changing to a material having a low flexural rigidity and a high tensile modulus and a high tensile strength. Since then, many improvements and developments have been made from such a viewpoint. In other words, if the conveyor material is replaced with a material that satisfies the above conditions, the bending stiffness is too large, and the resulting device is too large,
In addition to eliminating the danger that could lead to personal injury when the belt is broken, the pressure belt is flexible and thin without high bending stiffness, and has a high tensile modulus and high strength. The conveyor belt that feeds and presses the liner paper to the top of the pair of molding gear rolls on the side of the toothed roll on the side that comes into contact with the application roll of the adhesive application device and presses the liner straight without forming an arc between the tops of the toothed rolls In order to hold the liner paper and press it together, the core paper and the liner paper that have been corrugated and coated with an adhesive at the top of the step are joined on a straight line parallel to the line connecting the teeth of the toothed roll. It will be moved and adhered while being positioned, against the top of corrugated core paper,
The pressed liner paper no longer undulates when the corrugated paper is finally straightened.

[0006] Corrugated cardboard made of such a belt material, that is, a belt material which is resistant to bending fatigue, has high heat resistance, does not generate noise during operation, withstands high-speed running, and is free from contamination or leakage due to an adhesive or the like during cardboard production. Japanese Patent Application Laid-Open Nos. 7-60877 and 9-5787 disclose a manufacturing apparatus and a belt thereof.
An endless woven fabric made of a multifilament yarn made of a synthetic fiber having a high tensile modulus and a high strength having heat resistance, such as that disclosed in Japanese Patent Publication No. 7-73, is coated with a fluorine resin or the like in order to impart antifouling performance. The pressurized corrugated corrugating machine of the corrugated board type was developed, and the results of solving the problems proposed to solve it were tentatively achieved.

[0007]

However, when a wide multi-layered fabric is cut to form a conveyor belt, when the ears are frayed or the yarn ends are exposed, and the belt is mounted on a corrugated corrugated belt press for corrugated cardboard production. The belt's both ends are more susceptible to damage than the belt's center due to the friction of the both ends of the belt with the meandering adjustment position detector and guide and the unique tension applied to the belt end (ear) during long-term operation. It turned out that some kind of reinforcement was needed.

Further, in order to prevent the delamination and improve the durability of the belt used under such operating conditions where the stretching load-relaxation and bending are repeated, it is also necessary to search for a more effective structure of the reinforcing fabric. Was pursued as

In order to solve the above-mentioned problems, the present invention has high strength, excellent dimensional and shape stability, excellent high-speed straightness, excellent fatigue resistance and abrasion resistance, and damage to both end ears. An object of the present invention is to provide a conveyor belt having excellent deterioration resistance, no noise, and no press marks.

[0010]

Means for Solving the Problems The present inventor has succeeded in solving the problems by taking the measures defined in the claims. 1. Multifilament yarn made of aromatic para-aramid resin, or polyparaphenylene benzobisoxazole (PBO) or polybenzimidazole (PB
A stainless multifilament yarn is inserted into both end portions of the endless multi-layer fabric surface layer composed of a multi-filament yarn made of a polybenzazole resin such as I), and the fabric is coated with a synthetic resin having a releasing ability. Conveyor belt characterized by the following.

2. The conveyor belt according to claim 1, wherein the stainless multifilament yarn comprises a twisted yarn, a core covering yarn or a cord.

3. The conveyor belt according to claim 1, wherein the ear portion is overlocked with a sewing thread made of a stainless multifilament yarn.

4. The problem is solved by producing a conveyor belt according to claim 1, wherein a narrow tape in which a stainless multi-filament yarn is inserted is brought into contact with the ear portion and sewn with a sewing thread made of stainless steel. He succeeded in achieving his goal.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION

That is, in the present invention, the basic structure of the conveyor belt is configured as follows to solve the problem. (A) An aromatic para-based aramid resin is used in order to impart excellent durability to stretching load-relaxation and bending, which are repeatedly applied, and high strength with high dimensional stability. Multifilament yarn, or a multi-filament yarn made of polybenzazoles resin is to be composed of endless multiple woven fabric using high-strength fiber,

(B) Next, during the long-term high-speed operation of the conveyor belt, both ends of the belt are in contact friction with the meandering adjustment position detector and the guide, and due to a peculiar tension applied to the belt end (ear), the center of the belt. In order to solve the difficulty of being more easily damaged, as shown in FIG. 1, the stainless steel multifilament yarn 3 is inserted into both ends (ears) 2 of the endless multiple woven fabric 1 constituting the conveyor belt. As shown in FIG. 2, the ear portion 2 is overlocked with a sewing thread 4 made of a stainless multifilament yarn, or a stainless multifilament yarn is inserted into the ear portion 2 as shown in FIG. By contacting the narrow tape 5 and sewing the cover with a sewing thread made of stainless steel to cover the endless multi-woven fabric of the endless multi-layered fabric of the conveyor belt. Is that has taken measures to reinforce to prevent,

(C) When the conveyor belt of the corrugating machine for corrugated cardboard holds and transports the core paper and the liner paper to which the adhesive has been applied and which has been corrugated, and presses to bond the core paper to the core paper, In order to prevent contamination by the applied adhesive, the conveyor made of the endless multi-layered woven fabric is impregnated or coated or laminated with a synthetic resin such as a fluororesin having a releasing ability, and heated and pressed.・ It is that the mold release ability is given by sintering,

(D) Further, in order to improve the abrasion resistance of the conveyor belt, at least the fabric upper surface layer of the endless multi-layer fabric constituting the conveyor belt is [multifilament yarn comprising an aromatic para-aramid resin]. ,
Alternatively, a covering yarn having a core / sheath structure composed of a combination of a multifilament yarn made of a polybenzazole-type resin] / [a multifilament yarn made of stainless steel] is used as a lateral yarn of a belt so that the covering yarn is covered with the covering yarn. It is a structured one.

The endless multi-ply woven fabric used in the present invention is not special, and an endless quadruple or sixfold woven fabric manufacturing apparatus is used. For example, as shown in FIG. 6 can be woven into the front and back double weaving by driving the weft 7. Here, reference numeral 8 denotes a binding yarn. Similarly, as shown in FIG. 5, when the belt has a triple structure, it is possible to weave the warp 6 with the weft 7 to weave a three-sided double-sided bag.

Then, in both the longitudinal / weft directions, from 1,500 to 6.0,
00d, a multifilament yarn comprising an aromatic para-aramid resin, or a polybenzazole resin, ie, polyparaphenylene benzobisoxazole (PB
O) or a multifilament yarn composed of polybenzimidazole (PBI) or a multifilament yarn composed of an aromatic para-aramid resin or a multifilament yarn composed of a polybenzazole resin / multifilament yarn composed of stainless steel And a weaving yarn having a core density of 5 to 50 yarns / inch in both warp / weft.

The stainless filament has a diameter of 10
μm to 200 μm, preferably 50 μm to 15 μm
An alloy having a substantially circular cross section of 0 μm and mainly containing iron, for example, an Fe-Si alloy, an Fe-Al alloy, an Fe-Al alloy having an Fe content of 70% or more, preferably 80% or more. A Ni-based alloy may be used.

1 to 10 stainless filaments and 1,
Multifilament yarn of 500 to 6,000 d aromatic para-aramid resin, or polybenzazole resin, that is, polyparaphenylene benzobisoxazole (PBO) or polybenzimidazole (PBI)
And multifilament yarn consisting of
Twist about 0 times / meter or 1,500
Using a multifilament yarn made of an aromatic para-aramid resin of up to 6,000 d or a polybenzazole resin, that is, a multifilament yarn made of polyparaphenylenebenzobisoxazole (PBO), polybenzimidazole (PBI), or the like. , Diameter of sheath yarn 10
μm to 200 μm, preferably 50 μm to 15 μm
A core covering yarn using a stainless filament having a substantially circular cross section of 0 μm.

A multifilament yarn comprising an aromatic para-aramid resin having a molecular weight of 1,500 to 6,000 d;
Alternatively, a multifilament yarn made of a polybenzazole resin such as polyparaphenylenebenzobisoxazole (PBO) or polybenzimidazole (PBI) is used as a core yarn, and has a diameter of 10 μm to 200 μm, preferably 50 μm to 150 μm. A stainless steel filament having a circular cross section can be used as a sheath yarn to be tied by a lacing machine.

The release agent treatment and release agent used in the present invention prevent contamination due to adhesion and leakage of an adhesive to a belt during the production of corrugated paper, and also remove the corrugated paper produced from the belt. Mainly for the purpose of facilitating the purpose of imparting moderate rigidity to the conveyor belt made of the endless multi-layered fabric, furthermore, performing the filling of the fabric constituting structure of the endless multi-layered fabric, and somewhat in the width direction of the conveyor belt. Even if the tension fluctuation occurs, the fabric structure is deformed and displaced so as to stretch the rhombus, the length in the warp direction, the fluctuation in the width in the width direction, and further, the effect of preventing the occurrence of wrinkles and the like is aimed at. The release agent and release treatment for the endless multi-layered fabric include, but are not limited to, a solution (emulsion) of a known fluororesin and a silicone rubber-based release agent resin, etc., and then dried and heated.・ Addition · Or sintered, by performing a coating or laminate 該弗 Motokei resin or silicon rubber resin in place of the impregnation method, it is possible to produce a release treatment has been performed belt.

[0025]

EXAMPLES Hereinafter, a specific method for manufacturing a pressure belt of a pressure belt type corrugating machine according to the present invention will be described with reference to examples, but the present invention is not limited to the following examples. [Example 1] 1,500d / 1,0 of para-aramid fiber
00f. (Tensile strength 350 kg / mm ² , elongation at break 4.
^Two multifilament yarns each having a tensile modulus of 6% and a tensile elasticity of 7,4500 kg / mm ² ) are plied, and the number of twists is 100 turns / m.
Using 1,387 warps twisted at 1,500 d / 1,000 f. Of para-aramid fiber (tensile strength 350 kg
/ Mm ² , elongation at break 4.6%, tensile modulus 7,400
kg / mm ² ) and 1,387 warp yarns obtained by combining two stainless steel filaments each having a diameter of 100 μm with a twist of 100 times / m. Warping is performed so that a para-aramid fiber filament containing stainless steel comes out, and then a weft obtained by twisting the para-aramid fiber filament into 100 twists / m S twist and 100 twists / m Z twist alternately at a density of 30 yarns / inch. And woven into a warp double bag fabric. Then, the endless double-woven belt is impregnated with an ethylene tetrafluoride dispersion having an excellent releasing property, and heating and sintering at 370 ° C. are repeated three times. The pressure belt used in the machine was manufactured. Typical mechanical properties of the obtained conveyor were a tensile strength of 2400 kg / inch in a warp direction, 2450 kg / inch in a weft direction, a breaking elongation of 6% in a warp direction and 6.2% in a weft direction. The measurement of the physical properties was performed according to JIS L-
1096. In order to confirm the operating performance and durability during continuous running of the pressure belt thus obtained,
As a result of a running test implemented on a performance evaluation machine modeled on an actual machine, the belt straightness was excellent and the noise was extremely low. The contact between the drive roller and the guide roller flange (using a touch-type position detector) (using a roller with a flange intentionally to evaluate the abrasion resistance of both ends of the belt) and after continuous running for 480 hours No damage was found.

Example 2 In the endless double woven fabric described in Example 1, a multifilament yarn consisting of 1,500 d. Of polyparaphenylene benzobisoxazole (PBO) was used for the core yarn, and the diameter was used for the sheath. A core covering yarn using a stainless filament having a circular cross section of 100 μm was replaced with a weft of a core / sheath covering yarn so that the covering yarn came to the surface layer portion of the woven fabric. A pressure belt was produced. The mechanical properties of the obtained pressing belt were almost the same as those of the belt of Example 1 except for abrasion resistance. For the evaluation of abrasion resistance, it was mounted on a performance evaluation machine modeled on an actual machine in the same manner as in Example 1, and a running test was performed with the liner paper held therebetween. As a result, even after continuous running for 480 hours, Although slight traces of abrasion and peeling were observed on the surface layer of the fluorine resin coat layer, the belt itself was not damaged.

[Example 3] In the pressure belt made of the endless double woven fabric of Example 1, after weaving the warp double woven fabric, the diameter at both ends of the belt was improved in order to improve the abrasion resistance. A sewing thread consisting of 100 stainless filaments having a diameter of 12 μm was twisted with a lower twist of S200 times / m and overlocked with a stainless sewing thread obtained by twisting three of these yarns at a twist of 150 times / m. The mechanical performance of the obtained pressing belt was naturally higher than that of the pressing belt of Example 1, and no damage was observed even after continuous running for 960 hours. The running performance and the durability of the ears in the running test were also improved as compared with those in Example 1.

[Example 4] Instead of the method of overlocking with a stainless sewing thread in Example 3, a single yarn of a 20th stainless steel spun yarn was used for a warp of 31 yarns /
A 16 mm wide stainless narrow tape was woven at a density of 16 mm, weft 31/16 mm. This stainless narrow tape is put on the ear part, and a sewing thread composed of 100 stainless filaments having a diameter of 12 μm is twisted into a lower thread S200.
Twist / m twisted, and changed the method to sew the thread with a stainless sewing machine thread twisted at three twists of Z150 times / m to cover the thread. Produced. The mechanical performance of the obtained pressure belt is
Naturally, it is equivalent to the pressure belt of Example 1,
The running performance and endurance performance in the running test were also the same as in Example 1.

[Comparative Example] In the pressurizing conveyors of Examples 1 to 4, the endless belt 4 was constructed.
Insertion of stainless steel filaments at both ends of heavy fabric, reinforcement by overlock overlock, or reinforcement not performed by covering stainless steel narrow tape at both ends,
A pressure belt was manufactured in exactly the same manner as in Examples 1 to 4, and performance evaluation was performed in the same manner as in the example. The mechanical performance of the pressure belt is the same as in Examples 1 to 4, but the results of the running performance test on the running performance evaluation machine modeled on the actual machine specifications show the basic running conditions such as straightness and noise generation. The performance was the same as that of the pressure belts of Examples 1 to 4. However, after continuous running for 480 hours, deformation of the fabric constituting structure and fuzzing due to damage were observed at both end portions.
Also, it was shown that the ear reinforcing treatment of Example 4 was effective.

[0030]

According to the present invention, the endless multiple woven fabric constituting the conveyor belt is constituted by an endless multiple woven fabric (two to four woven fabrics) using heat-resistant fibers having a high tensile modulus and a high tensile strength. The stainless steel multifilament is inserted into both ends (ears) of the reinforcing cloth multi-woven fabric constituting the conveyor belt, and overlocking is performed with a sewing thread made of stainless steel multifilament, or a narrow tape is applied to the ears. By sewing with a sewing machine thread made of stainless steel, a conveyer belt reinforced at both ends is formed, and if necessary, the warp forming the surface layer of the conveyor belt reinforcing cloth is covered with a covering yarn whose sheath component is a stainless fiber. Conveyor bell manufactured by impregnating, coating or laminating with synthetic resin having mold release ability, heating, pressing and sintering Therefore, 1. High tension load is applied, high tension load is continuously repeated, and relaxation is repeated. As a pressure belt of corrugating molding machine for high-speed traveling pressure belt type corrugated cardboard production, noise generation is extremely low and straight running performance is good. No belt deformation / displacement and no wrinkles during long-term continuous operation.
It is possible to obtain a pressurizing belt in which the physical properties of the belt-constituting base material are not significantly degraded due to delamination or fatigue due to a relaxation load, and damage to both ends is extremely small. 2. Since the pressure belt is composed of a bell and a material having appropriate rigidity, there is no fear of generating a press mark in the obtained product. 3. It is possible to obtain a high-performance pressurizing belt in which all conventional improvements required for the pressurizing belt, such as improvement in the surface wear resistance of the belt, have been solved.

[Brief description of the drawings]

FIG. 1 is a partial front view of a bag-shaped double woven fabric of the present invention.

FIG. 2 is a partial front view of a bag-shaped double woven fabric showing a state of reinforcing an ear portion by overlock overlock of the present invention.

FIG. 3 is a partial front view showing a portion in which a narrow tape 5 in which a stainless multifilament yarn is inserted is brought into contact with an ear portion of the bag-shaped double woven fabric of the present invention, and is covered by sewing with a stainless sewing thread. .

FIG. 4 is a sectional view of a bag-shaped double belt structure of the present invention.

FIG. 5 is a sectional view of another bag-shaped triple belt structure of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Endless multi-layer woven fabric for conveyor belt 2 Ear part 3 Stainless filament yarn 4 Sewing thread 5 Narrow tape 6 Warp 7 Weft 8 Binding thread

Claims (4)

[Claims] 1. A multifilament yarn comprising an aromatic para-aramid resin or a multifilament yarn comprising a polybenzazole resin such as polyparaphenylene benzobisoxazole (PBO) or polybenzimidazole (PBI). Insert stainless steel filaments into both ends of the endless multi-layer fabric surface layer,
A conveyor belt, wherein the woven fabric is coated with a synthetic resin having a releasing ability. 2. The stainless steel filament is a twisted yarn,
The conveyor belt according to claim 1, comprising a core covering yarn or a cord. 3. The conveyor belt according to claim 1, wherein the ear portion is overlocked with a sewing thread made of a stainless filament. 4. The conveyor belt according to claim 1, wherein a narrow tape in which a stainless filament is inserted is brought into contact with the ear portion, and is sewn with a sewing thread made of stainless steel.