JP2017193441A - Conveyor belt and manufacturing method of conveyor belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conveyor belt capable of preventing fray and fluff of a warp yarn while suppressing damage to both end parts in a belt width direction.SOLUTION: A conveyor belt 1 comprises: a core body canvas 2 having a plurality of warp yarns 2a extending in a belt longitudinal direction and a plurality of weft yarns 2b extending in a belt width direction; two cover layers (elastic body layers) 4, 5 formed of an elastic material; and two adhesion layers 3, 3 respectively covering entire one side of the core body canvas 2 and bonding the cover layers 4, 5 and the core body canvas 2. The length of the core body canvas 2 in the belt width direction is the same as a belt width of the conveyor belt 1. The core body canvas 2 has weft independent parts 2c at both end parts in the belt width direction, which are composed of end parts of the plurality of weft yarns 2b in the belt width direction and do not include the warp yarn 2a.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a transport belt for transporting articles and a method for manufacturing the same.

  An endless conveyor belt is used when conveying articles such as food and electronic parts. The transport belt is a core canvas, an elastic layer made of a thermoplastic elastomer, etc., and an adhesive layer formed by applying an adhesive treatment to the core canvas to enhance the adhesion between the canvas and the elastic layer. And have. The core canvas is a woven fabric such as a plain weave woven with warp yarns extending in the belt longitudinal direction (circumferential length direction) and weft yarns extending in the belt width direction. Usually, when manufacturing such a conveyor belt, after forming a wide belt molded body, the belt molded body is cut into a predetermined belt width, and a plurality of conveyor belts are transported from one belt molded body. Manufacture belts. The end of the core canvas is exposed at the end face of the conveyor belt manufactured in this way. Therefore, the warp of the core canvas is exposed along the circumferential direction on the end surface of the conveyor belt.

  When the end surface of the conveyor belt comes into contact with the frame or cover of the conveyor device due to meandering or shifting when the belt is running, so-called pop-out occurs where warp yarn exposed on the end surface of the conveyor belt frays and jumps out of the end surface. The warp exposed on the end face of the belt may become fuzzy due to wear. If the warp frays and flies out or fuzzs, the warp may adhere to or mix with the conveyed product. In particular, when the conveyed product is food, it becomes a serious problem in terms of food hygiene and quality control. Although the weft is also exposed at the end face of the conveyor belt, since the weft is only exposed at the end, there is no problem even if the weft becomes fuzzy due to wear.

  On the other hand, in patent document 1, instead of using a long fiber, the spun yarn (spun yarn) which twisted the short fiber is used as a warp. Thereby, fraying of the warp yarn exposed on the end face of the conveyor belt is suppressed. However, the conveyance belt of Patent Document 1 is likely to cause fuzz of warps.

  In addition, a conveyance belt has been proposed in which a portion formed only of a thermoplastic material is provided at an end portion of the conveyance belt in the belt width direction (see, for example, Patent Document 2). Since the core canvas is not exposed on the end face of the conveyor belt, fraying and fluffing of warps can be prevented. For example, in Patent Document 2, both ends in the belt width direction of a conventional conveyor belt with the end surface exposed at the end of the core canvas are heated and pressurized to melt an elastic layer made of a thermoplastic material, thereby causing the belt width of the core canvas. By moving to the outside in the direction, a portion formed only of the thermoplastic material is provided at the belt width direction end of the conveying belt.

JP-A-11-130222 Special table 2011-507724 gazette

  However, when both end portions in the belt width direction of the conveyance belt are formed of only a thermoplastic material, the rigidity of both end portions in the belt width direction is low. For this reason, breakage such as cracks and tears tends to occur at the end of the conveyor belt in the belt width direction due to meandering and shifting when the belt is running.

  Then, an object of this invention is to provide the conveyance belt which can prevent the fray of a warp and fluff, and its manufacturing method, suppressing the damage of the belt width direction both ends.

  The transport belt of the present invention includes a plurality of warps extending in the belt longitudinal direction, at least one core canvas having a plurality of wefts extending in the belt width direction, and at least one elastic layer formed of an elastic material. Each of the transport belts covers one entire surface of the core canvas, and includes at least one adhesive layer that bonds the elastic body layer and the core canvas, the belt width direction of the core canvas The core canvas is composed of end portions of the plurality of wefts in the belt width direction at both ends of the belt width direction, and the warp yarns. It has the weft single part which does not contain (first invention).

According to this configuration, the transport belt includes the core canvas, the elastic layer formed of an elastic material, and the adhesive layer that bonds the elastic layer and the core canvas. The core canvas has a plurality of warps extending in the belt longitudinal direction and a plurality of wefts extending in the belt width direction. The core canvas is mainly responsible for the tensile force in the belt longitudinal direction (circumferential length direction) applied to the conveyor belt.
The length in the belt width direction of the core canvas of the transport belt is the same as the belt width of the transport belt. That is, the end of the core canvas is exposed at the end face of the conveyor belt. However, the core canvas of the transport belt has a single weft yarn portion that does not include warp yarns at both end portions in the belt width direction, which is composed of a plurality of weft yarn end portions in the belt width direction. Therefore, the warp is not exposed on the end face of the conveyor belt. Therefore, fraying and fluffing of warps can be prevented even when the end face of the conveyor belt contacts the frame of the conveyor device during belt running.
In addition, by providing the weft single parts at both ends in the belt width direction of the conveyor belt, both ends in the belt width direction of the conveyor belt are compared with the case where both ends in the belt width direction of the conveyor belt are configured only by elastic layers. The rigidity of can be increased. For this reason, even if there is meandering or deviation when the belt is running, cracks are unlikely to occur at the end of the conveyor belt in the belt width direction. Moreover, even if a crack occurs in the elastic layer at the belt width direction end portion of the conveying belt, the tear does not occur due to the presence of the weft.
Thus, the conveyance belt of the present invention can prevent warp fraying and fluffing while suppressing breakage at both ends in the belt width direction.

  In the transport belt of the present invention, the length of the at least one elastic body layer in the belt width direction may be the same as the belt width of the transport belt.

  According to this configuration, the elastic body layer on the surface of the transport belt is provided over the entire belt width direction. Depending on the conveyed product, the conveyance surface of the conveyance belt may require water resistance, heat resistance, chemical resistance, and the like. In the present invention, it is possible to transport a wide variety of transported objects by providing an elastic layer whose material is selected according to the demand.

  In the transport belt of the present invention, one or two elastic layers constituting the outer surface of the transport belt among the at least one elastic body layer are disposed at both ends of the transport belt in the belt width direction. The length of the end cover layer in the belt width direction is longer than the length of the weft single part in the belt width direction, and the second of the at least one elastic body layer. The elastic body layer that is not composed of one end cover layer may have the same length in the belt width direction as the belt width of the transport belt.

According to this configuration, the end cover layers are provided at both ends in the belt width direction on the inner peripheral surface and / or outer peripheral surface of the transport belt. Therefore, the conveyance surface of the conveyance belt becomes a core canvas, and an elastic body layer is not provided on the conveyance surface, so that the cost is low. Furthermore, since the conveyor belt is thin, the flexibility can be improved. Water resistance, heat resistance, and chemical resistance are not required. Rather, it is suitable when priority is given to flexibility and low cost, or it is used in applications that require slipperiness and non-adhesiveness.
Further, since the length of the end cover layer in the belt width direction is longer than the length of the weft single part in the belt width direction, the end cover layer is composed of not only the weft single part but also the warp and the weft. Cover the part. Therefore, the warp can be prevented from shifting. Furthermore, the strength of the end of the conveyor belt in the belt width direction can be improved and the strength of the entire conveyor belt can be improved rather than covering only the weft single part.

  In the transport belt of the present invention, it is preferable that the length in the belt width direction of the weft single part is 1 mm or more and 5 mm or less.

According to this configuration, when the length of the weft single part in the belt width direction is 1 mm or more, when the belt is running, the end face of the conveyor belt in the belt width direction comes into contact with the frame of the conveyor device and the elastic body layer. Even if worn, it is possible to prevent the warp from being exposed on the end face of the conveyor belt. Therefore, even if the conveyor belt is used for a long time, fraying and fluffing of the warp can be prevented.
Usually, it is not used in the state where the end of the conveyor belt is worn by 5 mm or more. Therefore, even if the length of the weft single part in the belt width direction exceeds 5 mm, there is no difference in the effect of preventing the warp from being exposed. In addition, the longer the weft single part, the less warp, and the lower the tensile strength of the conveyor belt in the longitudinal direction of the belt. Therefore, when the length of the weft single part in the belt width direction is 5 mm or less, it is possible to prevent the tensile strength of the conveyor belt in the belt longitudinal direction from being unnecessarily lowered.

  In the transport belt of the present invention, it is preferable that the elastic body layer and the adhesive layer are formed of a thermoplastic elastomer. According to this configuration, workability is good when the core canvas (particularly the weft single part) is laminated and bonded to the elastic layer.

  The method for manufacturing a conveyor belt according to the present invention includes the warp extending in the belt longitudinal direction at a portion corresponding to both ends in the belt width direction from a core canvas woven so that a plurality of warps and a plurality of wefts are orthogonal to each other. The first step of forming a plurality of weft single parts that are configured by a part of the plurality of wefts and do not include the warp, and the plurality of weft single parts are formed by the first step. A core canvas and an elastic layer formed of an elastic material are bonded via an adhesive layer, and at least one of the core canvas, at least one of the elastic bodies, and at least one of the adhesive layers is a belt. A second step of forming a belt molded body laminated in the thickness direction, and cutting the belt molded body created in the second step along the belt longitudinal direction with a predetermined belt width interval; Both in the belt width direction A third step of creating a conveyor belt wherein the weft alone unit is exposed on the surface, and having a.

According to this configuration, the transport belt includes the core canvas, the elastic layer formed of an elastic material, and the adhesive layer that bonds the elastic layer and the core canvas. The core canvas has a plurality of warps extending in the belt longitudinal direction and a plurality of wefts extending in the belt width direction. The core canvas is mainly responsible for the tensile force in the belt longitudinal direction (circumferential length direction) applied to the conveyor belt.
The core canvas of the conveyance belt has a single weft yarn portion that does not include a warp yarn, and is composed of a part of a plurality of weft yarns at both ends in the belt width direction. The weft single part is exposed at both end faces in the belt width direction. Therefore, the warp is not exposed on the end face of the conveyor belt. Therefore, fraying and fluffing of warps can be prevented even when the end face of the conveyor belt contacts the frame of the conveyor device during belt running.
In addition, by providing the weft single parts at both ends in the belt width direction of the conveyor belt, both ends in the belt width direction of the conveyor belt are compared with the case where both ends in the belt width direction of the conveyor belt are configured only by elastic layers. The rigidity of can be increased. For this reason, even if there is meandering or deviation when the belt is running, cracks are unlikely to occur at the end of the conveyor belt in the belt width direction. Moreover, even if a crack occurs in the elastic layer at the belt width direction end portion of the conveying belt, the tear does not occur due to the presence of the weft.
As described above, the transport belt manufactured by the transport belt manufacturing method of the present invention can prevent fraying and fluffing of warps while suppressing damage at both ends in the belt width direction.

  In the method for manufacturing a conveyor belt of the present invention, in the first step, three or more weft single parts are formed on the core canvas having a length in the belt width direction that is twice or more the belt width. In the third step, it is preferable that the belt molded body is cut to produce two or more conveyor belts.

According to this configuration, the length in the belt width direction of the core canvas of the belt molded body is twice or more the belt width of the conveyor belt, and the belt molded body is cut to create two or more conveyor belts. . Therefore, the conveyor belt can be manufactured more efficiently than when one conveyor belt is manufactured from one belt molded body.
In this manufacturing method, in the first step, portions of the warp corresponding to both ends of the belt width direction of the two or more conveyor belts are removed from the core canvas to form three or more single weft yarns. Of the three or more weft single parts, the weft single parts at both ends may be formed at the end of the core canvas. On the other hand, of the three or more weft single portions, the weft single portions other than both ends are formed at positions away from the end of the core canvas. Therefore, this weft single part is easy to ensure a state in which a plurality of wefts are aligned in parallel. Therefore, it is possible to more easily manufacture a high-quality transport belt as compared with the case where a single weft is formed from one belt molded body by forming a single weft yarn at both ends of the core canvas.

  In the transport belt manufacturing method of the present invention, in the first step, among the three or more weft single parts, the length in the belt width direction of the single weft part other than both ends is 2 mm or more and 10 mm or less. In addition, it is preferable that the length in the belt width direction of the weft single part of the transport belt formed in the third step is 1 mm or more and 5 mm or less.

According to this configuration, since the length in the belt width direction of the weft single part of the conveyor belt is 1 mm or more, the frame of the conveyor device contacts the end surface of the conveyor belt in the belt width direction and elastic while the belt is running. Even if the body layer is worn, it is possible to prevent the warp from being exposed on the end face of the conveyor belt. Therefore, even if the conveyor belt is used for a long time, fraying and fluffing of the warp can be prevented.
Usually, it is not used in the state where the end of the conveyor belt is worn by 5 mm or more. Therefore, even if the length in the belt width direction of the weft single part of the transport belt exceeds 5 mm, there is no difference in the effect of preventing the warp from being exposed. In addition, the longer the weft single part, the less warp, and the lower the tensile strength of the conveyor belt in the longitudinal direction of the belt. Therefore, when the length in the belt width direction of the weft single part of the transport belt is 5 mm or less, it is possible to prevent the tensile strength in the belt longitudinal direction of the transport belt from being unnecessarily reduced.

  The conveyor belt of the present invention is provided with a single weft yarn not containing warp at both ends of the core canvas in the belt width direction. Thereby, fraying and fluffing of warps can be prevented while suppressing breakage at both ends in the belt width direction.

It is a perspective view of the conveyor apparatus to which the conveyance belt was applied. It is sectional drawing of the conveyance belt of 1st Embodiment of this invention. FIG. 3 is a plan view of the conveying belt as viewed from above the paper surface of FIG. 2, and is a view in which illustration of members above the core canvas is omitted. It is a perspective view for demonstrating a part of manufacturing process of a conveyance belt. It is sectional drawing for demonstrating a part of manufacturing process of a conveyance belt. It is sectional drawing for demonstrating a part of manufacturing process of a conveyance belt. It is sectional drawing of the conveyance belt of 2nd Embodiment of this invention. It is sectional drawing of the conveyance belt of other embodiment of this invention. It is sectional drawing of the conveyance belt of other embodiment of this invention. It is sectional drawing of the conveyance belt of other embodiment of this invention. (A) is sectional drawing cut | disconnected along the belt longitudinal direction of the biaxial running test machine used by the test, (b) is BB sectional drawing shown to (a).

<First Embodiment>
Hereinafter, a first embodiment of the present invention will be described.
The conveyor belt 1 according to the present embodiment is an endless flat belt, and is used in, for example, a conveyor device 10 as shown in FIG. The conveyor apparatus 10 conveys articles such as food and electronic parts. The conveyor device 10 includes a drive pulley 11, a plurality of driven pulleys 12, and a plurality of support rollers 14. The conveyor belt 1 is wound around a driving pulley 11 and a plurality of driven pulleys 12. The plurality of support rollers 14 support a portion of the transport belt 1 that transports articles. In addition, the structure of the conveyor apparatus in which the conveyance belt of this invention is used is not limited to the structure of the conveyor apparatus 10 shown in FIG.

  FIG. 2 is a cross-sectional view of the transport belt 1 cut along the belt width direction. As shown in FIG. 2, the transport belt 1 includes a core canvas 2, two adhesive layers 3 and 3, and two cover layers 4 and 5. The core canvas 2 is a member mainly responsible for the tensile force in the belt longitudinal direction (circumferential length direction) applied to the conveyor belt 1. The cover layers 4 and 5 are disposed on both sides of the core canvas 2. The adhesive layers 3 and 3 adhere the core canvas 2 and the cover layers 4 and 5. Each of the cover layers 4 and 5 corresponds to an elastic body layer in the present invention. The lengths of the core canvas 2, the adhesive layers 3, 3 and the cover layers 4, 5 in the belt width direction are all the same. That is, the length of the core canvas 2 in the belt width direction is the same as the belt width of the transport belt 1. The adhesive layers 3 and 3 cover the entire one surface of the core canvas 2, respectively.

  FIG. 3 is a plan view of the transport belt 1 as viewed from above the paper surface of FIG. 2, and illustration of the cover layer 5 and the adhesive layer 3 bonded to the cover layer 5 is omitted. As shown in FIGS. 2 and 3, the core canvas 2 is a woven fabric woven by crossing warp yarns 2a and weft yarns 2b. 2 and 3 is a plain woven fabric, the core canvas 2 may be a woven fabric such as a twill weave or a satin weave. The core canvas 2 has a plurality of warps 2a and a plurality of wefts 2b. The plurality of warp yarns 2a extend along the belt longitudinal direction. The plurality of warp yarns 2a are arranged at a predetermined pitch P in the belt width direction. The weft 2b extends along the belt width direction and is substantially orthogonal to the warp as a whole. Both ends of the plurality of wefts 2b are exposed at both end surfaces 1a of the conveyor belt 1 in the belt width direction.

The core canvas 2 of the conveyor belt 1 has a weft single part 2c at both ends in the belt width direction. The weft single part 2c is comprised only by the edge part of the some weft 2b, and does not contain the warp 2a. The length in the belt width direction of the weft single part 2c of the conveyance belt 1 is L. The length L is longer than the pitch P. The length L is preferably, for example, 1 mm or more and 5 mm or less. The length L is preferably 2 to 10 times the pitch P. Further, the length in the belt width direction of the portion other than the weft single portion 2c of the core canvas 2 of the transport belt 1 is preferably four times or more the length L of the single weft yarn 2c.
2 and 3, the plurality of warps 2a are arranged at equal intervals, and the pitch P of the warps 2a is constant. For example, when using a plurality of types of warps 2a having different finenesses, There may be a plurality of types of pitches P of the warp 2a. When there are a plurality of types of pitches P of the warp 2a, the length L is larger than the maximum value of the pitches P.

  The material of the warp 2a and the weft 2b is, for example, a polyester fiber, an aromatic polyamide fiber, a nylon fiber, or the like. The warp yarn 2a and the weft yarn 2b are either a multifilament yarn in which filaments (long fibers) are aligned or twisted, a monofilament yarn that is a single long fiber, or a spun yarn in which short fibers are twisted (spun yarn). May be. In the case of the filament yarn, the fineness of the warp 2a and the weft 2b is, for example, 280 to 1670 dtex. dtex (decitex) is the mass of a 10,000 meter yarn expressed in grams. In the case of a spun yarn (spun yarn), the fineness of the warp 2a and the weft 2b is, for example, 10-30. The count indicates the thickness of a yarn having a weight of 1 pound (453.6 g) and a length of 840 yards (768.1 m) as the first count, and indicates that the yarn becomes thinner as the number increases. In the present specification, the numerical range represented by “X to Y” means X or more and Y or less. The density of the warp 2a in the portion other than the single weft 2c of the core canvas 2 is, for example, 70 to 150 / 5cm. The density of the weft 2b is, for example, 45 to 80 pieces / 5 cm. The thickness of the portion of the core canvas 2 excluding the weft single part 2c is, for example, 0.3 to 2.0 mm, and particularly preferably 0.5 to 1.2 mm. If the thickness of the core canvas 2 is less than 0.5 mm, it is difficult to ensure the strength and durability of the transport belt 1 necessary for transporting articles. On the other hand, when the thickness of the core canvas 2 is greater than 1.2 mm, the flexibility of the transport belt 1 is lowered. When the bendability is low, particularly in the case of a small-diameter pulley, traveling is performed in a state where the winding around the pulley is poor, and a large load is applied to the warp of the core canvas. As a result, the warp is cut, and in the worst case, the conveyor belt may be cut.

  The cover layers 4 and 5 are made of an elastic material. The material of the cover layers 4 and 5 is, for example, a thermoplastic elastomer such as polyurethane, polyvinyl chloride, and polyolefin. Polyurethane, polyvinyl chloride, and polyolefin thermoplastic elastomers are excellent in wear resistance. A polyurethane-based thermoplastic elastomer is particularly preferable as a material for the cover layers 4 and 5 because it is excellent in processability and strength. Among these, polyether polyurethane elastomers excellent in hydrolysis resistance or carbonate polyurethane elastomers excellent in heat resistance and chemical resistance are more preferable. The materials of the cover layer 4 and the cover layer 5 are preferably the same, but may be different. The cover layers 4 and 5 have a thickness of 0.2 to 1.0 mm, for example. The thickness of the cover layer 4 and the cover layer 5 may be the same or different. The JIS-A hardness of the cover layers 4 and 5 is, for example, 60 to 95 degrees. The hardness of the cover layer 4 and the cover layer 5 may be the same or different.

The adhesive layers 3 and 3 are provided to adhere the core canvas 2 and the cover layers 4 and 5. The material of the adhesive layer 3 is a thermoplastic elastomer. The adhesive layers 3 and 3 may be formed by applying an adhesive in which a thermoplastic elastomer is dissolved in an organic solvent to the core canvas 2 or immersing the core canvas 2 in the adhesive and then applying an organic solvent. It is formed by evaporating and removing. Specific examples of the thermoplastic elastomer of the adhesive layer 3 are the same as the specific examples of the thermoplastic elastomer of the cover layers 4 and 5. The type of the thermoplastic elastomer of the adhesive layer 3 is preferably the same as the type of the thermoplastic elastomer of the cover layers 4 and 5, but may be different. The adhesive layer 3 is particularly preferably formed using an adhesive in which a polyether polyurethane elastomer is dissolved in a mixed solvent of methyl ethyl ketone, cyclohexane and tetrahydrofuran.
The adhesive layer 3 may be made of a thermoplastic resin instead of the thermoplastic elastomer.

  Next, the 1st example of the manufacturing method of the conveyance belt 1 is demonstrated.

[Warning removal process]
First, a rectangular woven fabric having a width slightly larger than the belt width of the conveying belt 1 is prepared as the core canvas 2. Then, the warp yarn 2a in a range slightly longer than the length L at both ends in the width direction of the woven fabric is removed to form two weft single portions 2c. In other words, the warp yarns 2a corresponding to both ends in the belt width direction are removed to form two weft single parts 2c. The warp removing step corresponds to the first step in the method for manufacturing the conveyor belt of the present invention.

[Adhesive layer forming step]
Next, an adhesive in which a thermoplastic elastomer is dissolved in an organic solvent is applied to the core canvas 2 or the core canvas 2 is immersed in the adhesive. When the adhesive is applied to the core canvas 2, the adhesive is applied to one surface of the core canvas 2 by a pasting process. Thereby, the adhesive protrudes to the other surface of the core canvas 2 and covers the other surface. Thereafter, the thermoplastic elastomer is cured by evaporation of the organic solvent, whereby the adhesive layers 3 and 3 are formed so as to cover both surfaces of the core canvas 2.

[Cover layer forming process]
Next, the cover layer 4 is formed by extruding the thermoplastic elastomer into a sheet by an extruder. Similarly, the cover layer 5 is formed.

[Lamination bonding process]
The high-temperature, semi-molten cover layers 4 and 5 immediately after extrusion are laminated with the core canvas 2 whose both surfaces are covered with the adhesive layers 3 and 3. Then, pressure is applied between the two rotating rolls, and the cover layers 4 and 5 and the core canvas 2 are bonded by the adhesive layers 3 and 3. Thus, a rectangular belt molded body 7 (see FIG. 4) in which the core canvas 2, the cover layers 4, 5 and the adhesive layers 3, 3 are laminated in the belt thickness direction is formed. Note that the adhesive layer forming step and the laminating adhesive step correspond to the second step in the method of manufacturing the transport belt of the present invention.

[Cutting process]
Next, both ends of the formed rectangular belt molded body 7 are cut. At this time, the belt is cut along the belt longitudinal direction with an interval of the belt width of the conveying belt 1. By this cutting step, the weft 2b (the weft single part 2c) is exposed at both ends of the belt molded body 7 in the belt width direction.

[Jointing process]
Moreover, as shown in FIG. 4, the both ends of the belt longitudinal direction of the belt molded body 7 are cut into a zigzag shape. Subsequently, both end portions in the belt longitudinal direction of the belt molded body 7 are butted together, and two reinforcing members 8 and 9 formed of the same material as the cover layers 4 and 5 are disposed on both surfaces thereof. And the both ends which faced | matched are heat-pressed with a reinforcement member, and both ends are joined. Through the above-described steps, the transport belt 1 in which the weft single part 2c is exposed on both end faces in the belt width direction is manufactured. In addition, a cutting process and a joining process are corresponded to the 3rd process in the manufacturing method of the conveyance belt of this invention.

  Next, a second example of the method for manufacturing the conveyor belt 1 will be described.

[Warning removal process]
First, as the core canvas 2, a rectangular woven fabric (core canvas) 102 having a width equal to or more than twice the belt width of the conveyor belt 1 is prepared. The width of the woven fabric (core canvas) 102 may be, for example, 20 to 30 times the belt width. And as shown in FIG. 5, the warp 2a of the part corresponding to the both ends of the belt width direction of this woven fabric (core canvas) 102 is removed, and three or more weft single parts 2c and 2d are formed. . Of the three or more single weft yarns 2c, 2d, the length in the belt width direction of the single weft yarn 2d other than both ends is twice the length L in the belt width direction of the single weft yarn 2c of the conveyor belt 1. . The length in the belt width direction of the weft single part 2d is preferably 2 mm or more and 10 mm or less. Of the three or more weft single parts 2c and 2d, the weft single parts 2c at both ends may be formed at the end of the woven fabric (core canvas) 102. You may form in the position away from the end. By forming the weft single part 2c at a position away from the end of the woven fabric (core canvas) 2, the next step can be performed while the plurality of wefts 2b of the single weft 2c are aligned in parallel. The warp removing step corresponds to the first step in the method for manufacturing the conveyor belt of the present invention.

[Adhesive layer forming step]
Next, an adhesive in which a thermoplastic elastomer is dissolved in an organic solvent is applied to the woven fabric (core canvas) 102, or the woven fabric (core canvas) 102 is immersed in the adhesive. Thereafter, the thermoplastic elastomer is cured by evaporation of the organic solvent, whereby the adhesive layers 3 and 3 are formed so as to cover both surfaces of the woven fabric (core canvas) 102.

[Cover layer forming process]
Next, the cover layer 4 is formed by extruding the thermoplastic elastomer into a sheet by an extruder. Similarly, the cover layer 5 is formed.

[Lamination bonding process]
The high-temperature, semi-molten cover layers 4 and 5 immediately after extrusion are laminated with a woven fabric (core canvas) 102 whose both surfaces are covered with the adhesive layers 3 and 3. Then, pressure is applied between the two rotating rolls, and the cover layers 4 and 5 and the woven fabric (core canvas) 102 are bonded to each other by the adhesive layers 3 and 3. Thereby, as shown in FIG. 6A, a rectangular belt molded body 107 in which the woven fabric (core canvas) 102, the cover layers 4, 5 and the adhesive layers 3, 3 are laminated in the belt thickness direction is formed. Is done. In FIG. 6, the display of the adhesive layer 3 is omitted. The adhesive layer forming step and the laminating and bonding step correspond to the second step in the method for manufacturing the transport belt of the present invention.

[Cutting process]
Next, as shown in FIG. 6A and FIG. 6B, the belt molded body 107 is cut along the belt longitudinal direction at intervals of the belt width of the conveyor belt 1 to form a plurality of belts. A body 107a is formed. In FIG. 6A, the cutting position is indicated by a broken line. At this time, the belt molded body 107 is cut at an intermediate position of the weft single part 2d. The woven fabric (core canvas) 102 is divided into a plurality of core canvases 2, and the weft single part 2d is divided into two weft single parts 2c. Further, among the three or more single weft yarns 2c and 2d, cutting is performed at the positions of the single weft yarn portions 2c at both ends in the same manner as in the first example. The weft 2b (weft single part 2c) is exposed at both ends of the belt molded body 107a in the belt width direction.

[Jointing process]
Thereafter, both ends of the belt molded body 107a in the longitudinal direction of the belt are joined in the same procedure as the joining step of the first example described above. Through the above-described steps, the transport belt 1 in which the weft single part 2c is exposed on both end faces in the belt width direction is manufactured. In addition, a cutting process and a joining process are corresponded to the 3rd process in the manufacturing method of the conveyance belt of this invention.

  As the core canvas 2, a cylindrical belt molded body may be formed by using a cylindrical woven cloth instead of using a rectangular woven cloth. And in a cutting process, you may obtain the conveyance belt 1 by cut | disconnecting a cylindrical belt molded object to belt width. In this case, a joining process is unnecessary. As the tubular woven fabric, a seamless woven fabric may be used, or one formed in a cylindrical shape by joining both ends of a rectangular woven fabric may be used. .

The transport belt 1 according to the present embodiment has been described above. The conveyance belt 1 of the present embodiment has the following characteristics.
The length of the core canvas 2 of the transport belt 1 in the belt width direction is the same as the belt width of the transport belt 1. That is, the end of the core canvas 2 is exposed on the end surface 1 a of the conveyor belt 1. However, the core canvas 2 of the conveyor belt 1 includes the weft single parts 2c that do not include the warp yarns 2a at both ends in the belt width direction. Therefore, the warp 2a is not exposed on the end surface 1a of the transport belt 1. Therefore, fraying and fluffing of the warp yarn 2a can be prevented even when the end surface 1a of the conveyor belt 1 comes into contact with a cover or a frame (not shown) of the conveyor device 10 during belt running.
Further, by providing the weft single parts 2 c at both ends in the belt width direction of the transport belt 1, the transport belt 1 can be compared with the case where both ends in the belt width direction of the transport belt 1 are configured only by the cover layers 4 and 5. The rigidity at both ends in the belt width direction can be increased. For this reason, even if there is meandering or deviation when the belt is running, the end of the belt 1 in the belt width direction is hardly cracked. Even if the cover layers 4 and 5 are cracked at the end in the belt width direction of the transport belt 1, the weft 2b does not cause tearing.
Thus, the conveyance belt 1 can prevent fraying and fluffing of the warp yarn 2a while suppressing damage at both ends in the belt width direction.

  Further, the cover layers 4 and 5 constituting the surface of the transport belt 1 have the same length in the belt width direction as the belt width of the transport belt 1. Depending on the conveyed product, the conveyance surface of the conveyance belt 1 may require water resistance, heat resistance, chemical resistance, and the like. In the present embodiment, by providing the cover layers 4 and 5 whose materials are selected according to the request, it is possible to transport a wide variety of transported objects.

Further, when the length of the weft single part 2c in the belt width direction is 1 mm or more and 5 mm or less, the following effects are obtained.
When the length of the weft single portion 2c in the belt width direction is 1 mm or more, the frame of the conveyor device 10 comes into contact with the end surface 1a of the conveyor belt 1 in the belt width direction when the belt is running, and the cover layers 4, 5 Even if the wear is worn, it is possible to prevent the warp 2a from being exposed to the end face 1a of the conveyor belt 1. Therefore, even if the conveyor belt 1 is used for a long time, fraying and fluffing of the warp yarn 2a can be prevented.
Usually, it is not used in the state where the end of the conveyor belt is worn by 5 mm or more. Therefore, even if the length of the weft single part 2c in the belt width direction exceeds 5 mm, there is no difference in the effect of preventing the warp 2a from being exposed. Further, the longer the weft single part 2c, the smaller the warp 2a, so that the tensile strength in the longitudinal direction of the conveyor belt 1 decreases. Therefore, when the length of the weft single part 2c in the belt width direction is 5 mm or less, it is possible to prevent the tensile strength in the belt longitudinal direction of the transport belt 1 from being unnecessarily reduced.

  The cover layers 4 and 5 and the adhesive layer 3 are formed of a thermoplastic elastomer. Therefore, workability is good when the core canvas 2 (particularly the weft single part 2c) is laminated and bonded to the cover layers 4 and 5.

In the second example of the method for manufacturing the conveyor belt 1, the length of the core canvas 2 of the belt molded body 107 in the belt width direction is at least twice the belt width of the conveyor belt 1, and the belt molded body 107 is Two or more conveyor belts 1 are formed by cutting. Therefore, compared to the first example in which one conveyor belt 1 is manufactured from one belt molded body 7, the conveyor belt 1 can be efficiently manufactured.
In this manufacturing method, in the warp removing step, the warp 2a at the portions corresponding to both ends in the belt width direction of the two or more conveyor belts 1 is removed from the core canvas 2, and three or more single wefts 2c, 2d is formed. Of the three or more weft single parts 2 c and 2 d, the weft single parts 2 c at both ends may be formed at the end of the core canvas 2 in some cases. On the other hand, of the three or more weft single portions 2 c and 2 d, the weft single portions 2 d other than both ends are formed at positions away from the end of the core canvas 2. Therefore, the weft single part 2d is easy to ensure a state in which a plurality of wefts 2b are aligned in parallel. Therefore, compared to the first example in which the single weft yarn 2c is formed at both ends of the core canvas 2 and one conveyor belt 1 is manufactured from one belt molded body 7, the high-quality conveyor belt 1 is easier. Can be manufactured.

Second Embodiment
Next, a second embodiment of the present invention will be described. However, about the thing which has the structure similar to the said 1st Embodiment, the description is abbreviate | omitted suitably using the same code | symbol. The application of the conveyor belt 201 of this embodiment is the same as that of the conveyor belt 1 of the first embodiment.

  FIG. 7 is a cross-sectional view of the transport belt 201 cut along the belt width direction. As shown in FIG. 7, the transport belt 201 includes a core canvas 2, two adhesive layers 3 and 3, and cover layers 204 and 205. Each of the cover layers 204 and 205 corresponds to an elastic layer in the present invention. The cover layers 204 and 205 are provided only at both ends of the conveyor belt 201 in the belt width direction. Part of the adhesive layers 3 and 3 is exposed to the outside. The adhesive layer 3 plays a role of preventing infiltration of liquid such as water or oil into the core canvas 2. The cover layer 204 is composed of two end cover layers 204a and 204a disposed at both ends of the conveyor belt 201 in the belt width direction. The cover layer 205 includes two end cover layers 205a and 205a disposed at both ends of the conveyance belt 201 in the belt width direction. The material, thickness, and hardness of the cover layers 204 and 205 are the same as those of the cover layers 4 and 5 of the first embodiment.

  The two end cover layers 204a and 204a have the same length in the belt width direction. The two end cover layers 205a and 205a have the same length in the belt width direction. The length D of the end cover layer 204a in the belt width direction is the same as the length D of the end cover layer 205a in the belt width direction. The length D of the end cover layer 204a in the belt width direction may be different from the length D of the end cover layer 205a in the belt width direction. The length D in the belt width direction of the end cover layers 204a and 205a is longer than the length L in the belt width direction of the weft single part 2c of the core canvas 2. The length D in the belt width direction of the end cover layers 204a and 205a is preferably longer than the length L by 1 mm or more. The length D in the belt width direction of the end cover layers 204a and 205a is preferably shorter than the length of the core canvas 2 other than the single weft yarn 2c. The length L in the belt width direction of the weft single part 2c of the core canvas 2 is the same as in the first embodiment.

  The conveyor belt 201 is manufactured by the following manufacturing method, for example. Although the lamination adhesion process and the joining process are different from the first example described in the first embodiment, the other processes are the same. Hereinafter, the lamination adhesion process and the joining process in this manufacturing method will be described.

[Lamination bonding process]
A sheet of thermoplastic elastomer in a high temperature, semi-molten state immediately after being extruded from the extruder is cut into a predetermined size to form end cover layers 204a, 204a, 205a, 205a. Then, end cover layers 204 a, 204 a, 205 a, and 205 a are laminated on both ends in the belt width direction of the core canvas 2 whose both surfaces are covered with the adhesive layers 3 and 3. Then, both ends of the core body canvas 2 are heated and pressed together with the end cover layers 204a, 204a, 205a, 205a by a hot plate press, and the end cover layers 204a, 204a, 205a, 205a and the core body canvas 2 are bonded. It adheres with the adhesive layers 3 and 3. Thereby, a rectangular belt molded body is formed. In this bonding step, bonding by high frequency welding may be used in addition to bonding by hot plate press.

[Jointing process]
Part of both end portions of the belt molded body in the belt longitudinal direction (portions including cover layers 204 and 205) are overlapped. The overlapped both end portions are heated and pressed by a hot plate press to join the both end portions.

  In addition, the execution order of a lamination | stacking adhesion | attachment process and a joining process may be reverse to the above. That is, both ends in the longitudinal direction of the belt of the core canvas 2 whose both surfaces are covered with the adhesive layers 3 and 3 are joined to form a cylinder, and then both ends in the belt width direction of the cylindrical canvas 2 The cover layers 204 and 205 may be laminated and bonded to the portion.

  Similarly to the conveyor belt 1 of the first embodiment, the conveyor belt 201 of the present embodiment is provided with the weft single parts 2c at both ends of the core canvas 2 in the belt width direction. While suppressing breakage, fraying and fluffing of the warp 2a can be prevented.

  Further, the end cover layers 204 a are provided at both ends in the belt width direction on the inner peripheral surface of the transport belt 201. The end cover layers 205 a are provided at both ends in the belt width direction on the outer peripheral surface of the transport belt 201. The conveyance surface of the conveyance belt 201 becomes the core canvas 2, and the cover layer is not provided on the conveyance surface, so that the cost is low. Furthermore, since the conveyor belt 1 is thin, the flexibility can be improved. The conveyor belt 201 of this embodiment is suitable for use in applications that do not require water resistance, heat resistance, and chemical resistance, but rather give priority to flexibility and low cost, or require slipperiness and non-adhesiveness. .

  Further, the length in the belt width direction of the end cover layer 204a constituting the cover layer 204 is longer than the length in the belt width direction of the weft single part 2c. The length of the end cover layer 205a constituting the cover layer 205 in the belt width direction is longer than the length of the weft single part 2c in the belt width direction. Therefore, the end cover layers 204a and 205a cover not only the weft single part 2c but also the part constituted by the warp 2a and the weft 2b. Therefore, the warp 2a can be prevented from shifting. Furthermore, the strength of the end of the conveyor belt 201 in the belt width direction can be improved and the strength of the entire conveyor belt 201 can be improved as compared to covering only the single weft yarn 2c.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the first and second embodiments described above, and various modifications are possible as long as they are described in the claims. .

The conveyance belt 1 of the first and second embodiments includes one core canvas 2 and two cover layers 4, 5, 204, 205, but the configuration of the conveyance belt of the present invention is not limited to this.
For example, as shown in FIG. 8A and FIG. 9A, the conveyor belts 301 and 601 each having one core canvas 2 and one cover layers 5 and 205 may be used.

The transport belt of the present invention may have two or more core canvases.
For example, as shown in FIG. 8B and FIG. 9B, it has two core canvases 2, an intermediate layer 6 disposed between the two core canvases 2, and cover layers 5 and 205. The conveyor belts 401 and 701 may be used.
Also, for example, as shown in FIGS. 8C and 9C, two core canvases 2, an intermediate layer 6 disposed between the two core canvases 2, and two cover layers 4, 5, 204, and 205 may be used.
The intermediate layer 6 shown in FIGS. 8B, 8C, 9B, and 9C corresponds to the elastic layer in the present invention. The material, hardness, dimensions, and manufacturing method of the intermediate layer 6 are the same as those of the cover layers 4 and 5 of the first embodiment. When manufacturing the conveyor belt 401 shown in FIG. 8B, the cover layer 5 and the intermediate layer 6 that are in a high-temperature and semi-molten state immediately after extrusion are covered with two adhesive layers 3 and 3 covered on both sides. It is laminated with the core canvas 2 and is pressed and bonded between two rotating rolls. Other steps are the same as those in the first embodiment. Further, when the transport belt 501 shown in FIG. 8C was manufactured, both surfaces of the cover layers 4 and 5 and the intermediate layer 6 in the high temperature and semi-molten state immediately after extrusion were covered with the adhesive layers 3 and 3. The two core canvases 2 are laminated, and are pressed and bonded between the two rotating rolls. Other steps are the same as those in the first embodiment.

  In FIG. 8A, FIG. 8B, FIG. 9A, and FIG. 9B, one whole adhesive layer 3 is exposed to the outside. This adhesive layer 3 is provided on the inner peripheral side of the conveyor belts 301 and 501. Depending on the article to be conveyed, it may be provided on the outer peripheral side of the conveyor belt.

  Like the conveyor belts 901 and 1001 shown in FIGS. 10A and 10B, the core canvas 902 and 1002 may have at least one weft single part 2d in the middle of the belt width direction. Good. When the conveyor belts 901 and 1001 are manufactured by the manufacturing method of the second example, the weft single part 2d is provided at a portion corresponding to the middle of the belt width direction of the woven fabric (core canvas) 102 in the warp removing step. Will be provided. In the cutting step, only a part of the weft single part 2d among the plurality of single wefts 2d is cut.

  The conveyance belt of the present invention is not limited to a flat belt. The conveyance belt of the present invention may be, for example, a toothed belt or a V belt having a V-shaped cross section.

<Example 1>
As Example 1, a conveyor belt having the same configuration as the conveyor belt 1 of the first embodiment shown in FIGS. 2 and 3 was produced by the manufacturing method of the first example described above. The cover layers (4, 5) of the conveyor belt of Example 1 were formed of a polyether-based polyurethane elastomer and had a thickness of 0.3 mm and a JIS-A hardness of 90 degrees. For the warp (2a) of the core canvas (2) of the conveyor belt of Example 1, a polyester spun yarn of yarn count # 20 was used, and for the weft (2b), a polyester monofilament yarn having a fineness of 1100 dtex was used. The density of the warp (2a) of the core canvas (2) excluding the weft single part (2c) was 140 / 5cm, and the density of the weft (2b) was 56 / 5cm. The adhesive layer (3) of the conveyor belt of Example 1 was formed by immersing the core canvas (2) in an adhesive in which a polyether polyurethane elastomer was dissolved in a mixed solution of methyl ethyl ketone / cyclohexane / tetrahydrofuran. The length of the weft single part (2c) of the conveyance belt of Example 1 was 5 mm. The belt width of the conveyance belt of Example 1 was 100 mm, and the belt circumferential length was 1500 mm.

[Durability test]
An endurance running test of the conveyance belt of Example 1 was performed. The 5-axis running test machine used in this test was almost the same as the configuration in which the plurality of support rollers 14 were removed from the conveyor apparatus 10 shown in FIG. As the drive pulley (11) and the plurality of driven pulleys (12) of the 5-axis running test machine, those having a diameter of 20 mm were used. The conveyor belt was wound around the 5-axis running test machine so that the belt tension was 4 N / mm, and the belt was run until the belt was bent 6 million times. The running time was 200 hours.

  After the running test, both end faces in the belt width direction of the conveyance belt of Example 1 were visually confirmed. As a result, neither fraying of the warp yarn nor fuzzing occurred.

<Example 2>
As Example 2, a conveyor belt having a belt circumference different from that of Example 1 and having the same configuration as that of Example 1 was prepared by the manufacturing method of the first example described above. The belt circumferential length of the conveyance belt of Example 2 was 1800 mm.

<Comparative example>
As a comparative example, a conveyance belt in which both end portions in the belt width direction are formed only of a thermoplastic material was prepared. Specifically, a woven fabric having a width shorter than the belt width was used as the core canvas. And the warp removal process was excluded among the manufacturing processes of the said conveyance belt 1 of 1st Embodiment, and the conveyance belt was created in the same procedure as the conveyance belt of Example 2 except that. The length from the end of the conveyor belt of the comparative example in the belt width direction to the end of the core canvas was 5 mm.

[Rigidity comparison test]
A test was conducted to compare the rigidity of the end portions in the belt width direction of the conveyance belt of Example 2 and the conveyance belt of the comparative example. This test was performed using a two-axis running test machine 20 shown in FIG. The biaxial running test machine 20 includes a drive pulley 21 and a flanged pulley 22 that is a driven pulley. As the driving pulley 21, a pulley having a diameter of 50 mm was used. The pulley 22 with a flange includes a pulley body 22a and flanges 22b provided on both sides of the pulley body 22a. As the flanged pulley 22, a pulley body 22a having a diameter of 50 mm and a flange height H of the flange 22b (a radial length from the outer peripheral surface of the pulley main body 22a to the outer peripheral surface of the flange 22b) of 5 mm was used. .

  As shown in FIG. 11B, the conveyor belt B is driven so that the belt tension is 4 N / mm while placing one end of the conveyor belt B of the second embodiment in the belt width direction on the outer peripheral surface of the flange 22b. The belt was wound around the pulley 21 and the flanged pulley 22, and was run at a running speed of 50 m / min until the belt was bent 17,000 times. The running time was 5 hours. A similar running test was performed on the conveyance belt of the comparative example.

  After the running test, the conveyance belts of Example 2 and Comparative Example were visually confirmed. The conveyance belt of Example 2 was not damaged. On the other hand, the conveyance belt of the comparative example was torn at the position of the end of the core canvas. Thus, it can be seen that the conveyance belt of Example 2 has higher end rigidity than the conveyance belt of the comparative example.

1, 301, 401, 501, 601, 701, 801, 901, 1001 Conveyor belt 2, 102, 902, 1002 Core canvas 2a Warp 2b Weft 2c, 2d Weft single part 3 Adhesive layer 4, 5, 204, 205 Cover Layer (elastic layer)
6 Intermediate layer (elastic layer)
7, 107, 107a Belt molded body 204a, 205b End cover layer

Claims (8)

At least one core canvas having a plurality of warps extending in the belt longitudinal direction and a plurality of wefts extending in the belt width direction;
At least one elastic layer formed of an elastic material;
Each of the conveyor belts covers the entire one surface of the core canvas, and includes at least one adhesive layer that bonds the elastic body layer and the core canvas,
The length of the core canvas in the belt width direction is the same as the belt width of the conveyor belt,
The conveyor belt according to claim 1, wherein the core canvas includes a single weft yarn portion that does not include the warp yarns, at both end portions in the belt width direction, the end portions of the plurality of weft yarns in the belt width direction.   The conveyor belt according to claim 1, wherein the at least one elastic body layer has a length in the belt width direction that is the same as a belt width of the conveyor belt. One or two elastic layers constituting the outer surface of the conveyance belt among the at least one elastic layer are constituted by two end cover layers disposed at both ends of the conveyance belt in the belt width direction. And
The length in the belt width direction of the end cover layer is longer than the length in the belt width direction of the weft single part,
The elastic body layer that is not composed of the two end cover layers among the at least one elastic body layer has a length in the belt width direction that is the same as a belt width of the conveyance belt. 2. A conveyor belt according to 2.   The conveyor belt according to claim 2 or 3, wherein a length of the weft single part in the belt width direction is 1 mm or more and 5 mm or less.   The said elastic body layer and the said contact bonding layer are formed with the thermoplastic elastomer, The conveyance belt in any one of Claims 1-4 characterized by the above-mentioned. By removing the warp extending in the belt longitudinal direction of the portion corresponding to both ends in the belt width direction from the core canvas woven so that a plurality of warps and a plurality of wefts are orthogonal to each other, A first step of forming a plurality of weft single parts that are partly configured and do not include the warp;
The core canvas in which the plurality of single weft yarns are formed in the first step and the elastic body layer formed of an elastic material are bonded via an adhesive layer, so that at least one core canvas A second step of forming a belt molded body in which at least one elastic body and at least one adhesive layer are laminated in a belt thickness direction;
The belt formed body produced in the second step is cut along the belt longitudinal direction with a predetermined belt width interval, and the weft single part is exposed on both end faces in the belt width direction. And a third step of creating the conveyor belt. In the first step, three or more weft single parts are formed in the core canvas having a length in the belt width direction that is twice or more the belt width;
The method for manufacturing a conveyor belt according to claim 6, wherein in the third step, the belt molded body is cut to create two or more conveyor belts. In the first step, among the three or more weft single parts, the length in the belt width direction of the weft single part other than both ends is 2 mm or more and 10 mm or less,
8. The method for manufacturing a conveyor belt according to claim 7, wherein a length in the belt width direction of the weft single part of the conveyor belt formed in the third step is 1 mm or more and 5 mm or less.

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