JP2584218Y2 - Heat resistant laminated conveyor belt - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-resistant laminated conveyor belt, and more particularly to a heat-resistant laminated conveyor belt used in a paper feeding process.

[0002]

2. Description of the Related Art Conventionally, as a conveyor belt used in, for example, a paper feeding process, a belt obtained by laminating the same belt base material via a PFA film is known. Further, a conveyor belt laminated in two or more layers is used depending on applications requiring high strength.

FIG. 4 shows an example of a conventional laminated conveyor belt. Reference numerals 1 and 2 in the figure are heat-resistant fiber cloths laminated via the PFA film 3, and are, for example, woven cloths woven of glass fiber, carbon fiber, aramid fiber, and aromatic arylate fiber. The heat-resistant fiber cloth is woven in plain weave, satin weave, twill weave and the like. Further, at least one surface thereof is made of, for example, a fluorine resin made of a tetrafluoroethylene resin.
Such a fluororesin composite has excellent chemical resistance, heat resistance, non-adhesion, and abrasion resistance due to the presence of the fluororesin. In addition, when used under high tension, a plain belt may be used, but it is used by laminating two or more layers.

[0004]

However, a heat-resistant fiber woven fabric woven in the same weave is impregnated with a fluororesin dispersion, dried and sintered, and a two-layer belt formed by thermocompression bonding of a reinforcing layer and a wear-resistant layer. In the case of, due to the difference in the circumferential length between the reinforcing layer and the wear-resistant layer, the wear-resistant layer cannot follow the expansion and contraction of the reinforcing layer, and due to the shear stress at the interface between the reinforcing layer and the wear-resistant layer,
Alternatively, the shear stress of the wear-resistant layer itself causes the interface between the heat-resistant fiber woven fabric and the fluororesin layer to peel off, thereby deteriorating the inherent properties of the fluororesin and shortening the life of the belt.

This invention has been made in consideration of the above circumstances, and by providing a wear-resistant layer having elasticity,
It is an object of the present invention to provide a heat-resistant laminated conveyor belt that can extend the life without impairing the characteristics of the original fluororesin.

[0006]

SUMMARY OF THE INVENTION The present invention provides a reinforcing layer obtained by impregnating, drying and sintering a heat-resistant fiber base fabric with a fluororesin, and imparting elasticity formed of the heat-resistant fiber on the reinforcing layer.
A heat-resistant laminated conveyor belt comprising a wear-resistant layer obtained by impregnating, drying, and sintering a fluororesin in a base fabric thus obtained.

In this invention, the heat-resistant fiber is
Examples thereof include glass fiber, carbon fiber, aramid fiber, and aromatic arylate fiber. Of these, glass fiber and aramid fiber are particularly desirable.

In this invention, as the fluororesin, polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkylvinyl ether copolymer (PFA), and tetrafluoroethylene hexafluoropropylene copolymer (FEP) are used. Alternatively, a mixture of two or more types can be used. Further, a heat-resistant filler may be mixed into the fluorine resin in order to further improve the wear of the wear-resistant layer.

In the present invention, there are plain weave, satin weave, and twill weave as the weave of the woven fabric. A PFA film is formed by impregnating, drying and sintering a woven fabric woven with the same weave with a fluorine resin. In the case where the belt is formed into two layers by thermocompression bonding, the interface between the fiber woven fabric of the wear-resistant layer and the fluororesin may be separated due to the shear force due to the difference in the circumferential length between the reinforcing layer and the wear-resistant layer. Occur. Therefore, in the case of a two-layer belt shape, the combination of the reinforcing layer and the wear-resistant layer is a plain weave-knit weave, a satin weave, rather than the same weave, that is, a combination of plain weave-plain weave, satin weave- satin weave, and twill-twill weave. A combination of woven-knit woven and twill-knit woven is preferred. FIG. 2 is an explanatory view of the knit weave, and 11 in the figure denotes a knit weave base material.

In this invention, the wear-resistant layer is made of a heat-resistant short fiber having a corrugated shape , or a short fiber itself having a coil shape , formed into a non-woven fabric, impregnated with a fluororesin, dried and sintered to form a wear-resistant layer. Are preferred.

In the present invention, the content of the fluorine resin in the reinforcing layer is not more than 80% by weight , preferably not more than 80% by weight based on the total weight.
30 to 60% by weight . Here, the content is 80% by weight.
If it exceeds 30 , the bending resistance is impaired, and if it is less than 30% by weight , misalignment of the woven fabric may occur. On the other hand, the content of the fluorine resin in the wear-resistant layer is not more than 80% by weight , preferably 30 to 60 % by weight based on the total weight . Where 80
Exceeds wt% can not follow the elongation of the reinforcing layer present invention is intended, the stretchability and bendability will be impairing wear situation woven knit of less than 30 wt% is accelerated, also knit There is a risk of impairing the maintenance of the shape of the weave itself.

[0012]

According to this invention, the heat-resistant fiber of the wear-resistant layer is made of a knitted or corrugated or coiled non-woven fabric, so that the wear-resistant layer has elasticity, and is therefore a laminated belt made of the same conventional woven structure. Dramatically improved flexibility compared to
Life can be improved.

[0013]

FIG. 1A shows an embodiment of the present invention.
This will be described with reference to FIG. Here, FIG. 1A is a plan view of the heat-resistant laminated belt, and FIG.
FIG. 2 shows a cross-sectional view along the X-ray. Reference numeral 21 in the figure denotes a 0.5 mm thick reinforcing layer obtained by impregnating, drying, and sintering PTFE into a heat-resistant fiber base fabric. The reinforcing layer 21 is made of plain weave of aromatic aramid fiber (trade name: Technora, manufactured by Teijin Limited),
The woven fabric is impregnated with a PTFE dispersion (trade name: Teflon T-30J, manufactured by DuPont-Mitsui Fluorochemicals Co., Ltd.), dried, sintered at 380 ° C., and this process is repeated several times. Was.

On the reinforcing layer 21 (so-called outer peripheral side) ,
0.5 mm thick through a 25 μm thick PFA film 22
Is formed. The abrasion resistant layer 23 is made of knitted woven aramid fiber (trade name: Technora, manufactured by Teijin Limited), and the woven fabric is converted into PTFE (trade name: Teflon T-30J, manufactured by Du Pont-Mitsui Fluorochemical Co., Ltd.). 380 ° C after drying.
And obtained by repeating this process several times. The reinforcing layer 21 and the wear-resistant layer 23 are located below the reinforcing layer 21 (so-called
The inner layer ) , the wear-resistant layer 23 is placed on the upper side (so-called outer layer ) , and the PFA film 22 is interposed between the layers.
The upper and lower layers were thermocompression-bonded at a temperature of 0.98 MPa and a press pressure of 0.98 MPa, and the upper wear-resistant layer was made endless by bonding.

Thus, the heat-resistant laminated conveyor belt according to the above embodiment has a reinforcing layer 21 in which an aromatic aramid fiber base fabric is impregnated with PTFE, dried, and sintered.
The base material is formed of an abrasion-resistant layer 23 which is formed via an FA film 22 and is made by impregnating, drying, and sintering PTFE into a base fabric knitted with aramid fibers to impart elasticity. Therefore, the flexibility can be remarkably improved as compared with the conventional laminated belt manufactured with the same woven structure, and the life can be improved. In fact, the laminated belt according to the above-described embodiment was placed in an atmosphere at a temperature of 180 ° C. under a load of 1.5 kN.
The belt was run at a speed of 800 m / min and a belt running speed of 800 m / min as shown in FIG. However, FIG.
, 31 and 32 denote drive rolls on which a conveyor belt 33 is hung, and 34 denotes a load press roll. As a result, the number of times of breaking and bending was 49856 times. On the other hand, except that the wear-resistant layer woven fabric is a plain weave, a laminated belt was prepared in the same manner as in the example,
As a result of examining the number of bending bends, it was 465 times. This clearly shows that the present invention is superior to the conventional one.

[0016]

According to the present invention, as described in detail above, according to the present invention, a heat-resistant laminated conveyor belt capable of extending the life without impairing the characteristics of the original fluororesin by providing a wear-resistant layer having elasticity is provided. Can be provided.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a heat-resistant laminated conveyor belt according to an embodiment of the present invention. FIG. 1 (A) is a plan view, FIG.
FIG. 2B is a sectional view taken along line XX of FIG.

FIG. 2 is an explanatory view of a knit woven fabric according to the present invention.

FIG. 3 is an explanatory view of a running test of the heat-resistant conveyor belt of FIG. 1;

FIG. 4 is an explanatory view of a conventional laminated conveyor belt.

[Explanation of symbols]

21 ... reinforcement layer, 22 ... PFA film, 23
... Abrasion resistant layer, 31, 32 ... Drive roll, 33 ... Conveyor belt, 34 ... Load pressure roll.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tomomi Haraguchi 200, Hirao, Tsukiyo-cho, Chogawa-cho, Matsuura, Nagasaki Prefecture Inside Chuko Kasei Kogyo Co., Ltd. 200 Tide In Chuko Kasei Kogyo Co., Ltd. (56) References JP-A-63-17711 (JP, A) JP-A-3-6920 (JP, U) (58) Fields investigated (Int. Cl. ⁶⁾ , DB name) B65H 5/02 B65G 15/30-15/58

Claims (6)

(57) [Scope of request for utility model registration] 1. A heat-resistant fiber base cloth impregnated with a fluororesin, dried and sintered, and a reinforcing cloth formed on the reinforcement layer and made of heat-resistant fiber and provided with a fluororesin is included.
A heat-resistant laminated conveyor belt comprising a wear-resistant layer that has been soaked, dried, and sintered . 2. The heat-resistant laminated conveyor belt according to claim 1, wherein the heat-resistant fiber is any one of glass fiber, carbon fiber, aramid fiber, and aromatic arylate fiber. 3. The heat-resistant fiber of the wear-resistant layer has a wavy shape.
2. The heat-resistant laminated conveyor belt according to claim 1, wherein the nonwoven fabric is a nonwoven fabric composed of short fibers having coiled elasticity . 4. The heat-resistant fiber of the wear-resistant layer is knit-woven.
Characterized in that it is a woven fabric
The heat-resistant laminated conveyor belt according to claim 1. 5. The fluororesin in the reinforcing layer is based on the total weight.
The heat-resistant laminated conveyor belt according to claim 1, which is not more than 80% by weight . 6. The fluororesin in the wear-resistant layer is based on the total weight.
The heat-resistant laminated conveyor belt according to claim 1, which is 80% by weight or less.