JP2011133029A - Flat belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flat belt low in a bending loss, high in tensile strength, low in a creep loss and high in durability. <P>SOLUTION: Core wires 12 laid in a longitudinal direction are arrayed at a fixed interval in the width direction of the flat belt 10. The core wires 12 are embedded into a tensile strength layer 11 constituted of a nylon 6 resin. A canvas 13 comprising a nylon 6 fiber is bonded onto both the upper and under faces of the tensile strength layer 11, using a polyamide adhesive. A rubber layer comprising NBR rubber is bonded onto the outside of the canvas 13, using a rubber adhesive. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a transmission or conveyance flat belt that travels at high speed, and more particularly to a tangential belt that transmits power to a spindle or rotor that rotates at high speed in a textile machine or the like.

  For example, a film core flat belt having a stretched polyamide film as a core (tensile member) is generally used for transmission to a spindle used in a textile machine. A flat belt using a film core generally has a good balance between elongation rigidity and flexibility and a large transmission capacity. Further, since the joint processing with an adhesive is possible and the joint strength is relatively high, the belt length can be freely selected. For these reasons, the film core flat belt has been widely used as a power transmission and conveyance belt (see Patent Document 1).

Japanese Patent Laid-Open No. 10-146900

  However, in recent textile machines that are becoming larger in size, reduction of space and energy is required, and for long belts, reduction of elongation is required to reduce space. Therefore, the belt needs to have high elongation rigidity (tensile strength). However, since the stretch ratio of the stretched polyamide film used as the core has already reached the limit region, it is not possible to increase the elongation rigidity of the belt by stretching. Therefore, it is necessary to increase the thickness of the core in order to increase the elongation rigidity of the film core flat belt. However, when the core is made thicker and the elongation rigidity is increased, the bending rigidity increases, so that energy loss due to bending loss increases.

  An object of the present invention is to obtain a flat belt with low bending loss, high tensile strength, low creep loss, and high durability.

  The flat belt of the present invention is a flat belt comprising a tensile layer in which a core wire or a stretched film as a tensile member is embedded, a canvas bonded to the tensile layer, and a rubber layer bonded to the canvas, the tensile layer Nylon 6, nylon 66, nylon 6/66 copolymer, a mixture of nylon 6 and nylon 6/66 copolymer, and a mixture of nylon 66 and nylon 6/66 copolymer are used for the canvas. Nylon 6 fiber is used.

  A core wire is preferably used as the tensile member, and a nylon 6 resin is preferably used for the tensile layer. A polyamide-based adhesive is used for bonding the tensile strength layer and the canvas, and a rubber-based adhesive is used for bonding the canvas and the rubber layer. The elements are firmly bonded to each other. The flat belt is a tangential belt for transmitting power, for example, and is formed into an endless belt by bonding both ends of a belt-like belt with an adhesive.

  According to the present invention, a flat belt having high durability with low bending loss, high tensile strength and low creep loss can be obtained.

It is a cross-sectional view of the flat belt of 1st Embodiment. It is a cross-sectional view of a conventional flat belt that is employed as a comparative example and uses a stretched polyamide film as a core. It is a cross-sectional view of the flat belt of 2nd Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view along the belt width direction showing the configuration of a flat belt according to the first embodiment of the present invention.

  The flat belt 10 is an endless belt that transmits power in a tangential contact with a spindle or rotor of a textile machine or the like. As shown in FIG. 1, the flat belt 10 is composed of five upper and lower layers.

  In the tensile strength layer 11 disposed in the center of the belt cross section, a plurality of core wires 12 are embedded on the belt pitch line along the longitudinal direction of the belt as a core body (strength member). Moreover, the core wires 12 are arranged at regular intervals in the belt width direction. The canvas 13 is adhered to both the upper and lower surfaces of the tensile layer 11, and rubber layers 14 as surface materials are formed on the outer sides thereof.

  A fiber cord is used for the core wire 12, and natural fibers such as cotton, chemical fibers such as polyamide fibers, aramid fibers, polyester fibers, and glass fibers, or combinations thereof are used. As a more specific example, an S twist and a Z twist of para aramid cord 440 dtex / 3 are alternately used.

  The tensile layer 11 in which the core wire 12 is embedded has nylon 6, nylon 66, nylon 6/66 copolymer, a mixture of nylon 6 and nylon 6/66 copolymer, and a mixture of nylon 66 and nylon 6/66 copolymer. Either of these is used. That is, the tensile layer 11 is made of nylon 6, nylon 66, nylon 6/66 copolymer, a mixture of nylon 6 and nylon 6/66 copolymer obtained by melt-extrusion of core wires 12 arranged at regular intervals in the belt width direction. It is formed by coating with any resin of a mixture of nylon 66 and nylon 6/66 copolymer. Note that additives such as a heat resistance stabilizer, an antistatic agent, a plasticizer, an impact modifier, a reinforcing agent, and a processing aid may be appropriately added to the material used for the tensile strength layer 11. Moreover, in the following description, the case where nylon 6 resin is used for the tensile strength layer 11 will be described as an example.

  For the canvas 13, a woven fabric or a knitted fabric using nylon 6 fibers is used similarly to the tensile strength layer 11. For the rubber layer 14, for example, NBR rubber or the like is used. A polyamide-based adhesive is used for adhering the tensile strength layer 11 and the canvas 13 using nylon 6 resin, and a rubber-based adhesive is used for adhering the canvas 13 and the rubber layer 14.

  Also, as shown in FIG. 1, a belt-like belt in which a tensile strength layer 11, a canvas 13, and a rubber layer 14 are laminated is formed into an endless belt with both ends connected by an adhesive. In this connection, for example, both ends of the belt are made into complementary finger shapes, and the fingers are butted together to form a polyamide-based adhesive (for example, Polybond A (trade name, manufactured by Nitta Corporation)) or a urethane-based adhesive. Although it uses and adhere | attaches, the shape of each end surface for butt | matching is not limited to a finger.

  Next, examples of the present invention will be described with reference to Table 1 using a conventional flat belt 20 having a stretched polyamide film as a core (tensile member) as a comparative example. FIG. 2 is a cross-sectional view showing the structure of the flat belt 20 of the comparative example.

  In the flat belt of the example, para-aramid cords 440 dtex / 3 are twisted alternately with S and Z in the belt width direction and arranged at equal intervals of density 7 / cm, and this is covered with melt-extruded nylon 6. Nylon 6 woven fabric was used as the canvas 14 to be bonded to both sides of the tensile strength layer 11 as the tensile strength layer 11 having a thickness of 0.8 mm. The total thickness of the belt including the rubber layer 14 was 2.7 mm.

  On the other hand, in the comparative example, a flat belt 20 in which the stretched polyamide film 21 as a core (corresponding to the tensile strength layer 11) was 1.1 mm and the total belt thickness was 2.7 mm was used. In addition, the thickness and material of the canvas 22 adhered to both surfaces of the stretched polyamide film, the material of the rubber layer 23, and the like are substantially the same as those in the example.

  As shown in Table 1, although the thickness of the tensile strength layer is thin, the standard elongation rate is 1%, and a value approximately equal to the value (52.8 N / mm) when the standard elongation rate of the comparative example is 2%. Since (55.2 N / mm) is indicated, it is possible to suppress the stretch allowance to about ½ or less of the conventional flat belt, and the belt length when the mounting tension is applied can be shortened. In addition, since the belt can have high tensile strength, the elastic elongation of the belt can be reduced and the cleave loss can be reduced.

  Moreover, as shown in Table 1, the bending resistance of the flat belt of the example is as low as 75 when the bending resistance of the comparative example is 100. Therefore, the winding resistance is small even for a small-diameter pulley, and the bending loss can be reduced.

  From the above, according to this embodiment, a flat belt with low energy loss can be obtained while having high tensile strength. In particular, in the present invention, the conventional configuration can simultaneously reduce the bending loss that is directly correlated to the thickness of the tensile layer and the creep loss that is inversely correlated to the thickness of the tensile layer, thereby greatly reducing energy consumption. be able to.

  In addition, by using nylon 6 resin for the tensile layer, the lateral stiffness and lateral bending stiffness of the belt are increased and the wear resistance on the side of the belt is also improved compared to the case where a thermoplastic elastomer is used for the tensile layer, for example. It is done. Furthermore, the use of nylon 6 fibers for the tensile strength layer and the canvas enhances the adhesion between the tensile strength layer and the rubber layer that interpose the canvas.

  Next, with reference to FIG. 3, the flat belt of 2nd Embodiment of this invention is demonstrated. FIG. 3 is a cross-sectional view showing the configuration of the flat belt of the second embodiment.

  The flat belt 30 of the second embodiment uses a stretched film 31 instead of the core wire 12 used as the core body (tensile member) in the first embodiment, and other configurations are the same as those of the first embodiment. It is. That is, the stretched film 31 is disposed at the approximate center of the tensile layer 11, and the tensile layer 11 is configured as a structure in which the upper and lower sides of the stretched film 31 are sandwiched between resin layers. Moreover, the rubber layer 14 is stuck on the upper and lower sides of the tensile strength layer 11 via the canvas 13 similarly to the first embodiment.

  As in the first embodiment, nylon 6, nylon 66, nylon 6/66 copolymer, mixture of nylon 6 and nylon 6/66 copolymer, nylon 66 and nylon 6 are used for the resin of the tensile strength layer 11 sandwiching the stretched film 31. Any resin of the 6/66 copolymer mixture is used. Furthermore, the material similar to 1st Embodiment is used for the canvas 13, the rubber layer 14, and these adhesion | attachment.

  As described above, the flat belt of the second embodiment can obtain substantially the same effect as the flat belt of the first embodiment.

DESCRIPTION OF SYMBOLS 10, 30 Flat belt 11 Tensile layer 12 Core wire 13 Canvas 14 Rubber layer 20 Flat belt 22 Canvas 23 Rubber layer 31 Stretched film

Claims (5)

A flat belt comprising a tensile layer in which a core wire or stretched film as a tensile member is embedded, a canvas bonded to the tensile layer, and a rubber layer bonded to the canvas,
Any one of nylon 6, nylon 66, nylon 6/66 copolymer, a mixture of nylon 6 and nylon 6/66 copolymer, and a mixture of nylon 66 and nylon 6/66 copolymer is used for the tensile layer. A flat belt characterized in that nylon 6 fibers are used for the canvas.   2. The flat belt according to claim 1, wherein a core wire is used as the tensile member, and a nylon 6 resin is used for the tensile layer.   The polyamide adhesive is used for bonding the tensile strength layer and the canvas, and the rubber adhesive is used for bonding the canvas and the rubber layer. Flat belt as described in   The flat belt according to claim 3, wherein the flat belt is a tangential belt for transmitting power.   The flat belt according to claim 4, wherein both ends of the belt-like belt are bonded with an adhesive to form an endless belt.

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