JPH0665566B2 - Conveyor belt and manufacturing method thereof - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conveyor belt, and more particularly to a conveyor belt having a liner for preventing meandering on the back surface of an endless belt, and a method for manufacturing the same.

(Prior Art) Generally, a conveyor belt is used as a means for conveying food or industrial products. Some kind of meandering prevention means is applied to such a conveyor belt. For example, as shown in FIGS. 1 and 2, a guide is provided on a conveyor roller (50) on which the conveyor belt (100) is hung. groove
There is one in which (51) is provided and a line-like liner (20) for preventing meandering is provided by being continuously fitted in the guide groove (51).
Such a meandering preventive conveyor belt is used in various industrial fields, for example, a food baking machine that conveys food to a baking oven to bake or heat the food, or a laminated food baking machine.
It is used in a cloth heating and bonding machine, etc., which conveys a sheet of cloth by a conveyor belt arranged oppositely and heat-presses it. The meandering prevention conveyor belt used in such a food baking machine or a cloth heating and bonding machine is naturally required to have heat resistance, and with such heat resistance, a conveyor belt having a liner for preventing meandering is Conventionally, various things have been devised. For example, the actual Kaihei 1-143710
There is "a meandering preventive conveyor belt" as disclosed in Japanese Patent Publication No. JP-A-2003-96, and this meandering preventive conveyor belt is "a base material seal rich in heat resistance, the back surface of a belt body impregnated with a fluororesin and baked. In a meandering-preventing conveyor belt, in which one or more guide bodies are attached along the longitudinal direction of the main body, the guide body is also impregnated with fluororesin in a base fiber having high heat resistance and fired, and further its cross section is It is formed into a belt shape by forming a circle, a corner, or the like, and the upper surface of the guide body is applied to the back surface of the belt body, and is welded by a hot press or the like to plate it. The bottom of the body is sewn with a heat-resistant thread that is impregnated with a heat-resistant fluororesin and baked. ”

In other words, this meandering prevention conveyor belt, on the back surface of the belt body having heat resistance impregnated with fluororesin and baked,
A heat-resistant guide body impregnated with a fluororesin and fired, that is, a liner is sewn with a heat-resistant thread impregnated with a fluororesin and fired. Moreover, in order to facilitate the sewing of the guide body to the belt body, a method of temporarily fixing by welding is adopted.

(Problems to be solved by the invention) However, the conventional meandering prevention conveyor belt,
Since the guide body, that is, the liner is "impregnated with base resin having high heat resistance with fluorocarbon resin and baked", the liner has a state in which the fiber structure of the base fiber containing fluorocarbon resin appears on the surface. Has become. Therefore, the surface of the liner has irregularities, which makes it difficult for the guide groove of the transport roller to slip, and when this meandering prevention conveyor belt is continuously run, it is rubbed by the friction of the guide groove and the fluororesin is removed. It becomes worn, and the base fibers are gradually exposed, and the fibers are raised and tattered. If you continue to use the liner as it is, the liner may break, or as shown in Fig. 14, the liner (22
0) is caught in the guide groove (51) of the transport roller (50),
Alternatively, it rides on the transport roller (50) and consequently cannot be used as a conveyor belt. The above-mentioned state is particularly likely to occur when the cross-sectional shape of the liner is round, but even when the cross-sectional shape is rectangular, the same result is brought because the base fiber is exposed. is there.

Further, the guide body (220) in the conventional meandering prevention conveyor belt (200), that is, the liner (220), is a sewing thread ( Although it is sewn according to (230), it is a little hard because it is impregnated and baked with fluororesin, and it is difficult to sew due to poor needle passing. Furthermore, as shown in Fig. 15, the sewing thread for sewing
The guide body (220) may be deformed due to the pulling of the (230). When the guide body is deformed, the external dimensions change and the guide roller does not continuously fit in the guide groove, or the meandering amount in the guide groove, that is, the amount of movement to the left and right becomes large. Not only can the belt body not run smoothly, but it also rubs inside the guide groove and becomes worn out.
There is a problem of getting on the transport roller. Further, since the conventional liner (220) has a base fiber, when the belt main body (220) is sewn, the connection between the edges of the liner is poor, and the joint part is better than other parts. Therefore, there is a problem that the joint portion may stick out from the guide groove of the conveying roller or may run on the conveying roller.

The present invention has been made in view of the above circumstances, and the purpose thereof is that the liner has good wear resistance, and also has a high slidability, and deviates from the guide groove of the conveying roller. It is an object of the present invention to provide a conveyor belt that does not ride on the rollers and a manufacturing method that can easily manufacture a conveyor belt in which the outer dimensions of a liner can be accurately obtained.

(Means for Solving the Problems) In order to solve the above problems, the means adopted by the present invention will be described with reference to the reference numerals attached to the drawings. "An endless belt made by joining heat-resistant sheet materials (11) in an annular shape
A conveyor belt (100) comprising (10) and a string-like liner (20) having heat resistance provided on the back surface of the endless belt (10) along the longitudinal direction thereof, wherein the liner ( 20) is a heat resistant string made of only fluororesin (21)
The conveyor belt (100) is characterized in that the side surface (23) is molded into a flat shape and the side surface (23) is formed into a flat shape. In order to manufacture, the means adopted by the invention according to claim 2 is that "a heat-resistant string-like liner (20) is provided on the back surface of the heat-resistant endless belt (10) along the longitudinal direction thereof. A method for manufacturing a conveyor belt (100), comprising: (a) joining the heat-resistant sheet material (11) in an annular shape to form an endless belt (1
0) is formed, and (b) a heat resistant string (21) made of only fluorocarbon resin is sewn to the back surface of the endless belt (10) along the longitudinal direction thereof with a heat resistant thread (30), and (c) after that, A conveyor belt (1) characterized by forming the liner (20) by heat molding the heat resistant string (21) by a hot press machine (40) or the like so that the side surface (23) becomes flat.
The manufacturing method of 00) "is the gist.

(Operation of the Invention) By adopting the above means, the conveyor belt (100) and the manufacturing method thereof according to the present invention operate as follows.

First, the conveyor belt (100) according to the invention of claim 1.
In this case, as shown in FIG. 3, the liner (20) is composed of a heat resistant string (21) made of only fluorocarbon resin, and the liner (20) has a conventional base fiber. Therefore, the surface becomes smooth without unevenness to improve the slidability, and the heat resistance and wear resistance are improved by the fluororesin, and the strength is also improved. The side surface (23) of the liner (20) is flat, and the contact area with the guide groove (51) of the transport roller (50) is large as shown in FIG. In addition, the liner (20) is made of only fluororesin, and its edges are connected well, so the joint part can be molded to the same thickness as other parts, so it is hard to come off from the guide groove (51). , Transport rollers
You can't get on (50). In addition, the liner (2
(0) is molded and its cross section has accurate external dimensions, so it fits continuously in the guide groove (51) and
Rubbing within the (51) is small, and the conveyor belt (100) can be smoothly run.

Next, in the manufacturing method according to the second aspect of the present invention, the heat resistant string (21) for the liner (20) is made of the heat resistant yarn (30) and the endless belt (10).
The heat resistant string (21) is soft because it is made of only fluororesin, and therefore, it has good needleability and good workability when sewing. The liner (20) is shown in Figs.
As shown in Fig. 11, heat-resistant string (21) made of only fluororesin
Since it is heat-molded with a hot press machine (40) etc. after sewing, even if the heat resistant string (21) is deformed when sewing, it is possible to form a liner (20) with accurate external dimensions At the same time, it becomes possible to mold into a free cross-sectional shape.

(Embodiment) Next, an embodiment of the conveyor belt (100) and the manufacturing method thereof according to the present invention will be described with reference to FIGS. 1 to 13.

FIG. 1 shows a conveyor belt (10) according to the invention of claim 1.
0) one embodiment is shown, this conveyor belt (100)
Is composed of an endless belt (10) and a liner (20). As shown in FIG. 5, the endless belt (10) is made of heat-resistant fiber cloth made of glass-filled fiber or aramid resin fiber, and fluororesin such as polytetrafluoroethylene (PTFE) or polychlorotrifluoroethylene (PCTFE). The heat-resistant REIT material (11) impregnated with and fired is joined in an annular shape by welding or the like. Then, as shown in FIGS. 1 and 2, a belt (12) made of the same material as the endless belt (10) is welded to the back surface of the endless belt (10) and one end side thereof. The end portions of the endless belt (10) provided with the liner (20) are reinforced to strengthen the endless belt (10).

As shown in FIG. 3, the liner (20) is made of the above-mentioned PTFE or PC.
Heat-resistant string made of only TFE or other fluororesin without core material
It is composed of (21) and molded so that its side surface (23) is flat. As a specific example of this heat resistant string (21),
Japan Gore-Tex Co., Ltd. product name "Gore-Tex" (registered trademark) PTFE is foamed into a film, which is then wrapped in multiple layers into a marshmallow-shaped, flexible,
Use a liner (20) with excellent heat resistance so that the side surface becomes flat, for example, by heat molding with a hot press machine (40) etc. so that its cross-sectional shape becomes a square or the like. To form. And this liner (20) is on the band (12) of the endless belt (10) by the heat resistant yarn (30) made of glass-filled fiber or aramid resin fiber, that is, on the back surface of the endless belt (10). The conveyor belt (100) according to the present embodiment is configured by being sewn along its longitudinal direction. The endless belt (10) and liner (2
Needless to say, it is not always necessary to adhere by (0) to sewing, and it is also possible to adhere by welding or the like.

Next, an embodiment of the invention according to claim 2 will be described as a method of manufacturing the conveyor belt (100).

(A) First, as shown in FIG. 5, a heat-resistant sheet material obtained by impregnating the above-mentioned heat-resistant fiber cloth with a fluororesin and firing it.
The endless belt (10) is formed by annularly heat-welding (11) with a hot pressing machine (40) through the joining sheet (13), and further, as shown in FIG. A band member (12) made of the same material as the heat resistant sheet material (11) is welded to the rear edge of the back surface (10).

(B) Next, as shown in FIG. 7, a heat resistant string (21) made of only fluororesin is sewn to the center of the band (12) of the endless belt (10) with heat resistant thread (30). As the heat resistant string (21) at this time,
Since the flexible product named "Goretech" is used, the sewing work can be easily performed. In addition, a sewing machine (70) is used for sewing, and the heat-resistant string (21) is laterally moved by the presser foot (60) with the bottom surface (61) formed in an arc shape as shown in FIGS. 12 and 13. Sew it while supporting it so that it will not escape. At this time, the heat-resisting string (21) is continuously sewn to a predetermined position so that the positioning member (62) positions the sewing. The heat-resistant string (21) sewn is crushed into an elliptical cross-section by the heat-resistant thread and the tensile force of (30). The cross-section is shaped so as to have a substantially circular shape, and liquid fluororesin is applied to the boundary between the heat resistant string (21) and the endless belt (10).

(C) Finally, as shown in FIG. 9 to FIG. 11, the heat resistant string (21) made of only the fluororesin was heated by the hot press machine (40) at 360 ° C. for 1 minute to 1 minute 30 seconds. Originally, it is heat-molded to obtain a conveyor belt (100) having a liner (20) with a flat side surface (23). When heat-molded by this hot press machine (40), the fluororesin of the heat resistant string (21) is melted and integrated with the fluororesin impregnated in the endless belt (10), so the endless belt (10) The liner (20) and the liner (20) are more firmly and integrally fixed to each other. Also liner (20)
Since the endless belt (10) is molded after the heat resistant string (21) is sewn to the endless belt (10), even if the low heat string (21) is deformed at the time of sewing, the accurate external dimensions of the liner (20) Can be obtained. In addition, liner (20) for molding after sewing
It is possible to freely form the cross-sectional shape of, and for example, as shown in FIG. 4, a trapezoidal shape in which only one side is inclined can be easily molded. When the liner (20) having such a cross-sectional shape is used and the guide groove (51) of the transport roller (50) is formed into a trapezoidal shape such that this liner (20) fits, the guide groove From (51) to liner (2
It is difficult for 0) to come off.

When the heat-resistant yarn (30) is impregnated with a fluororesin such as PTFE and baked during the heat molding, the heat-resistant yarn (30) becomes tough and there is no inconvenience such as wear and tear.

Next, a method of using the conveyor belt (100) manufactured in this way will be described. That is, as shown in FIGS. 1 and 2, the conveyor belt (100) is hooked on the conveyor roller (50) and the liner (20) is installed in the guide groove (51) of the conveyor roller (50). They are fitted and set, and the conveyor roller (50) is rotated to drive the conveyor belt (100) to convey the conveyed object placed on the conveyor belt (100). At this time, since the liner (20) is in the form of a string, the liner (20) travels while being continuously fitted into the guide groove (51) of the transport roller (50), which prevents the conveyor belt (100) itself from meandering. It is planned. The liner (20) is made of heat-resistant string made of only fluororesin so that the side surface (23) of the liner (20) is flat, so the liner (20) itself has good wear resistance and slippage. The liner (20) is hard to come off from the guide groove (51) of the transport roller (50),
The liner (20) does not ride on the roller (50).

The materials constituting the heat-resistant sealing material (11) and the heat-resistant yarn (30) are not particularly limited as long as they have the same effect, and for example, those manufactured by Kuraray Co., Ltd. You may use the product name "Vectran",
The fluororesin impregnated into these is not particularly limited, and for example, a product having a strength increased by mixing carbon and graphite with a trade name “Teflon” manufactured by DuPont may be used. Further, the position and quantity of the liner (20) provided on the endless belt (10) are not particularly limited.

(Effects of the Invention) As described in detail above, the conveyor belt according to the invention of claim 1 is an "endless belt formed by joining heat-resistant sheet materials in an annular shape, and a back surface of the endless belt along its longitudinal direction. A conveyor belt having a heat-resistant string-shaped liner provided therein, the liner being made of a heat-resistant string made of only fluororesin and having its side surfaces formed into a flat shape. " It has the above characteristics.

Therefore, according to this conveyor belt, since the liner is made of a heat-resistant string made of only a fluororesin, the surface thereof is smooth without irregularities and has excellent slidability, and also has excellent heat resistance and wear resistance, and further It is also excellent in strength, and will not be rubbed by the guide groove of the transport roller and will not be broken. In addition, the side surface of the liner is smooth and the contact area with the guide groove of the conveying roller is large, and the connection of both edge edges of the liner is good, and the joint part is the same as other parts. Since it is formed to have a large thickness, it does not easily come off from the guide groove, and the liner does not run on the conveyor roller during traveling of the conveyor belt to prevent traveling. Furthermore, since the liner is molded and its cross section has accurate external dimensions, it fits continuously in the guide groove and the degree of rubbing of the side surface in the guide groove is reduced, resulting in wear resistance. And the conveyor belt can be smoothly run.

Next, the manufacturing method according to the invention of claim 2 is a manufacturing method of a conveyor belt, wherein "a heat-resistant string-like liner is provided on the back surface of a heat-resistant endless belt along its longitudinal direction. (B) A heat-resistant sheet material is joined in an annular shape to form an endless belt, and (b) a heat-resistant string made of only fluorocarbon resin is sewn on the back surface of this endless belt along its longitudinal direction with heat-resistant thread. (C) Then, the heat resistant cord is heat-molded by a hot press machine or the like so that the side surface thereof becomes flat, thereby forming a liner. ”

Therefore, according to this manufacturing method, since the heat-resistant string for the liner is made of only the fluororesin, it is soft, and therefore the needle is easily threaded and the sewing operation is easy. Also,
Since the liner is heat-molded by a hot press machine after sewing, even if the heat resistant string for the liner is deformed at the time of sewing, a liner having an accurate external dimension and a free cross-sectional shape can be obtained. Therefore, a conveyor belt provided with a highly reliable liner can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a conveyor belt according to the invention of claim 1, FIG. 2 is an enlarged sectional view taken along the line AA in FIG. 1, and FIG. 3 is a partial enlargement in the vicinity of the liner in FIG. A sectional view, FIG. 4 is an enlarged sectional view corresponding to FIG. 2 of another embodiment, and FIGS. 5 to 9 show one embodiment of a method for manufacturing a conveyor belt according to the invention of claim 2 in the order of steps. Perspective view, No.
10 and 11 are cross-sectional views showing a step of molding a liner by a hot press machine, FIG. 12 is a cross-sectional view showing a step of sewing a heat-resistant cord on an endless belt, and FIG. 13 is a B in FIG.
-B cross-sectional view, FIG. 14 is a cross-sectional view corresponding to FIG. 2 showing a state in which a conventional meandering prevention conveyor belt rides on a conveyance roller, and FIG. 15 shows a sewing state of a guide body in the conventional meandering prevention conveyor belt. It is sectional drawing shown. Explanation of code 100 …… Conveyor belt, 10 …… Endless belt, 11 …… Heat-resistant sheet material, 12 …… Band, 13 …… Joining sheet, 20 ……
Liner, 21 ... Heat resistant string, 23 ... Side, 30 ... Heat resistant thread,
40 …… hot press machine, 50 …… conveying roller, 51 …… guide groove, 60 …… cloth retainer, 61 …… bottom surface, 62 …… positioning member, 63 …… brush, 64 …… burner, 70 …… sewing machine , 200
…… Conventional meandering prevention conveyor belt, 210 …… Belt body, 220 …… Conventional liner (guide body), 230 …… Sewing thread.

Claims (2)

[Claims] 1. A conveyor belt comprising an endless belt formed by annularly joining heat-resistant sheet materials, and a heat-resistant string-like liner provided on the back surface of the endless belt along its longitudinal direction. A conveyor belt, characterized in that the liner is made of a heat-resistant string made of only a fluororesin and the side surfaces of the liner are molded flat. 2. A method for producing a conveyor belt, wherein a heat-resistant string-like liner is provided on the back surface of a heat-resistant endless belt along the longitudinal direction thereof. An endless belt is formed by joining the endless belts in an annular shape, and (b) a heat resistant string made of only fluorocarbon resin is sewn on the back surface of the endless belt along the lengthwise direction thereof with a heat resistant thread. A method for manufacturing a conveyor belt, which comprises forming a liner by hot molding so that the side surfaces thereof are flat by a hot press machine or the like.