JP5873355B2 - Seamless belt - Google Patents

Description

  The present invention relates to a seamless belt used for a belt conveyor.

  As the conveyor belt of the belt conveyor, a joint belt obtained by joining a belt-like belt endlessly at a seam and a seamless belt having an endless belt shape without a seam are used. The seamless seamless belt does not generate vibration or catch due to the level difference of the seam, and can be stably conveyed even if the conveyed item is a lightweight item such as food.

  For the core of the seamless belt, a woven fabric having high tear strength that is woven endlessly by bag weaving or the like is usually used (for example, see Patent Documents 1 and 2). This woven fabric is a plain weave made by weaving warp and weft alternately up and down. Multi-filament and monofilament yarns, which are continuous long fiber yarns, are used for the warp and weft. The weft is woven in the belt width direction.

  In addition, the core of a seamless belt for a belt conveyor is usually woven in a wide width so that a plurality of belts can be collected at the same time, and formed into a wide belt formed with an adhesive layer by a coating process or a cover layer by a laminating process. After the body is formed, it is cut into a width so as to have a predetermined belt product width. For this reason, the width end surface of the manufactured seamless belt becomes a cut edge that is cut in width.

JP 2001-207358 A JP 2004-149267 A

  The above-mentioned seamless belt with a cut end at the width end face is a warp that is exposed to the cut end face when the width end face comes into contact with the belt conveyor frame, cover, etc. due to meandering or offset when the belt is running. A fraying phenomenon may occur where the cut ends of the weft and the weft are frayed.

  As described in Patent Documents 1 and 2, a conventional seamless belt using a woven fabric using long fiber yarns for warps and wefts as a core has a long fiber yarn frayed by a fraying phenomenon. When entangled with a pulley or the like, there is a problem that the long fiber yarn of the warp woven in the belt circumferential direction is continuously frayed and the fraying phenomenon does not stop and progresses. In this way, when the fraying phenomenon progresses, the long fiber yarn that has frayed for a long time adheres to or mixes with the conveyed product, especially when the conveyed item is food, in terms of food hygiene and quality control. It becomes a serious problem.

  Accordingly, an object of the present invention is to prevent the fraying phenomenon of the core body made of a woven fabric from progressing even if the width end face of the seamless belt is a cut edge.

In order to solve the above-described problems, the present invention provides a plain woven fabric woven with a warp woven in the belt circumferential direction and a weft woven in the belt width direction on a seamless endless belt-shaped core. In a seamless belt in which an adhesive layer covering the outer peripheral surface and the inner peripheral surface of the core body is formed and the width end surface is a cut edge, a spun yarn using short fibers is used for the warp of the woven fabric. , basis weight of the adhesive forming the adhesive layer employing the configuration is the 200-30Og / m ^2.

  In other words, by using spun yarn using short fibers for the warp of the woven fabric used for the core, the warp woven in the belt circumferential direction continues even if fraying occurs on the width end face of the cut edge. The fraying phenomenon was prevented from progressing by preventing it from fraying. In addition, when the core is covered with an adhesive layer, the spun yarn of short fibers has a greater adhesive force with the adhesive due to the anchor effect than the filament yarn of long fibers, so that the occurrence of fraying can be suppressed. There is expected.

  In the spun yarn, the short fibers are 20 to 30 and the two or three short fibers are preferably twisted 30 to 50 times per 10 cm length. As the short fiber, it is preferable to use a fiber having a small elongation such as a polyester fiber, an aromatic polyamide fiber, or a nylon fiber.

  The length of the short fiber used for the spun yarn is preferably 30 to 60 mm. If the length of the short fiber is 30 mm, the tensile strength of the spun yarn may decrease or the uniformity may not be adjusted. If the length of the short fiber exceeds 60 mm, the frayed length increases. It is.

  The seamless belt according to the present invention uses a spun yarn using a short fiber as a warp of a woven fabric used for the core, so that even if a fraying phenomenon occurs on the width end face of the cut edge, the seamless belt is woven in the belt circumferential direction. It is possible to prevent the fraying phenomenon from progressing by preventing the warped yarn from continuously fraying.

The external appearance perspective view which shows the belt conveyor using the seamless belt which concerns on this invention Cross section showing the seamless belt of FIG. (A) is a front view which shows the belt conveyor used for the running test of a seamless belt, (b) is sectional drawing along the III-III line of (a). Cross-sectional view showing a variation of the seamless belt of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a belt conveyor 10 using a seamless belt 1 according to the present invention. The belt conveyor 10 conveys food, and the endless belt-like seamless belt 1 is wound around one drive pulley 11 and a plurality of driven pulleys 12 to form a conveyance surface 13 on the lower surface of the seamless belt 1. On the side, a plurality of support rollers 14 are arranged in the transport direction.

  FIG. 2 shows a cross section of the seamless belt 1. The upper surface side of the cross section is the endless belt-shaped outer peripheral side, the lower surface side is the inner peripheral side, and the direction perpendicular to the paper surface is the belt circumferential length direction. The width end surfaces 1a on both sides in the left-right direction, which is the belt width direction, are cut edges that are cut in width. The core 2 of the seamless belt 1 is formed of a woven fabric woven by warps 3 woven in the belt circumferential direction and wefts 4 woven in the belt width direction. The outer peripheral surface and inner peripheral surface of the core body 2 are covered with an adhesive layer 5 formed by an adhesive paste process, and the outer peripheral surface of the core body 2 covered with the adhesive layer 5 is a cover layer 6. It is covered.

  The warp 3 of the woven fabric is a spun yarn in which two 20th polyester fibers having a fiber length of 50 mm are twisted 48 times per 10 cm length, and the weft 4 is a polyester fiber having a thickness of 660 dtex. Monofilament yarn. This woven fabric is woven by a plain weave having a density of 50 warps / 25 mm and 30 wefts / 25 mm.

The adhesive forming the adhesive layer 3 is a urethane adhesive such as ether urethane, ester urethane, polycarbonate urethane, etc., and glue is applied from the outer peripheral surface side of the core 2 wound between two rotating rolls. By being applied by the drawing process, the adhesive layer 5 is formed which covers the outer peripheral surface of the core body 2 and protrudes from the weave of the woven fabric to the back side to cover the inner peripheral surface. The basis weight of the adhesive is 200 to 300 g / m ² . The adhesive layer 3 serves to prevent infiltration of liquid such as water or oil into the core body.

  The cover layer 6 is formed of a polyurethane-based, polyolefin-based, polyvinyl chloride-based or the like thermoplastic elastomer and is heat-sealed by a hot press machine or the like to cover the outer peripheral surface of the core body 2. The cover layer 6 has a thickness of 0.3 mm. The cover layer 6 serves to smooth the transport surface of the seamless belt 1 and to ensure an appropriate coefficient of friction with the transported object.

  As an example, a seamless belt using a spun yarn as the warp of the core woven fabric described above and a monofilament yarn as the weft was prepared. As a comparative example, a polyester filament multifilament yarn (thickness 1100 dtex, number of twists 1, number of twists 5 times / 10 cm) is used for the warp of the woven fabric of the core, and the same monofilament yarn as in the embodiment is used for the weft. A seamless belt having the same adhesive layer and cover layer was also prepared. The dimensions of each seamless belt of the example and the comparative example were 100 mm width and 1500 mm circumference.

  About each seamless belt of the Example and comparative example mentioned above, the running test using the belt conveyor for a test was done. As shown in FIGS. 3A and 3B, the test belt conveyor 20 includes one drive pulley 21 and four driven pulleys 22, and one width end face of the seamless belt 1 on the transport line. A contact plate 23 to be brought into contact with 1a was installed. The diameter of the driving pulley 21 and each driven pulley 22 was 30 mm, and the length of the contact plate 23 in the conveying direction was 250 mm.

  In the running test, the running speed of each seamless belt of the example and the comparative example was 50 m / min, the belt tension was 3 N / mm, and the contact plate 23 was pressed against the width end surface 1a with a force of 0.1 N / mm, It was run for up to 1000 hours and the fraying phenomenon on the width end face 1a was observed.

  Table 1 shows the results of the running test. In the comparative example using long filament multifilament yarn as the warp, the fraying phenomenon was observed after running for 68 hours, and the frayed length of the warp became 50 mm. Therefore, the test was stopped halfway. On the other hand, the fraying phenomenon did not occur in the example using short fiber spun yarn for warp even after running for 1000 hours. From this test result, it was confirmed that the occurrence and development of the fraying phenomenon can be effectively suppressed by using a spun yarn of short fibers as the warp.

  FIG. 4 shows a cross section of a modified example of the seamless belt 1. A seamless belt 1 according to this modification is obtained by superimposing the above-described embodiment on two inner and outer layers, and the width end faces 1a on both sides in the left-right direction are cut edges. The cover layer 6 on the inner peripheral side is an intermediate layer 7 for heat-sealing the inner and outer two layers.

  In the embodiment described above, the monofilament yarn is used as the weft of the woven fabric of the core body, but a spun yarn may be used as the weft.

  In the above-described embodiment, the seamless belt is used for transporting food, but the seamless belt according to the present invention is not limited to transporting food, and is used for transporting electrical parts, mechanical parts, and the like. You can also

DESCRIPTION OF SYMBOLS 1 Seamless belt 1a Width end surface 2 Core body 3 Warp 4 Weft 5 Adhesive layer 6 Cover layer 7 Intermediate layer 10 Belt conveyor 11 Drive pulley 12 Drive pulley 13 Transport surface 14 Support roller 20 Belt conveyor 21 Drive pulley 22 Drive pulley 23 Contact plate

Claims (3)

A plain woven fabric woven with warps woven in the belt circumferential direction and wefts woven in the belt width direction is used for a seamless endless belt-shaped core, and the outer peripheral surface and inner peripheral surface of the core In a seamless belt in which an adhesive layer is formed and a width end surface is a cut edge, a spun yarn using a short fiber is used as the warp of the woven fabric, and the basis weight of the adhesive forming the adhesive layer is A seamless belt characterized by being 200 to 300 g / m ² .   2. The seamless belt according to claim 1, wherein the spun yarn is obtained by twisting 2 to 3 of the short fibers 30 to 50 times per 10 cm length, with the short fibers being 20-30.   The seamless belt according to claim 1 or 2, wherein the short fibers used for the spun yarn have a length of 30 to 60 mm.

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