JP2012006180A - Method of manufacturing crosspiece-provided belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an endless crosspiece-provided flat belt by a simple method without an increase of the number of processes.SOLUTION: A long belt material 10 has a thermoplastic resin layer. Both ends 17 and 18 of the belt material 10 are butted together, and the butted portion 19 is mounted on a lower mold 21. A release sheet 25 and an upper mold 22 are mounted on the belt material 10. The release sheet 25 has notches 26 and 26. The butted portion 19 arranged with the release sheet 25 on the belt surface 10A is held between the lower mold 21 and the upper mold 22 and heated and pressurized. The heating pressurization fuses both the ends 17 and 18 together with the resin of the thermoplastic resin layer, and the notches 26 and 26 are also filled with the resin to mold crosspiece parts on the belt surface 10A.

Description

  The present invention relates to a method for manufacturing a belt with crosspieces in which crosspieces are formed on the belt surface while fusing both ends of the belt.

  A long belt having a thermoplastic resin layer as a surface material or an intermediate material may be formed into an endless belt by being fused after both ends processed into finger shapes are abutted. For example, in Patent Document 1, a releasable sheet and an upper mold are placed on the butted portion of the belt set in the lower mold, and the heated and pressurized state is sandwiched between the upper mold and the lower mold. A method of fusing both ends is disclosed.

  On the other hand, in the case of a conveyor belt, for example, a crosspiece may be provided on the surface of the belt in order to flip off the conveyed object staying on the conveyor surface. The crosspiece is attached to the belt surface with, for example, an adhesive, or formed by stamping or the like as disclosed in Patent Document 2, apart from the process of fusing both ends of the belt.

JP 2008-221630 A JP 2006-117337 A

  However, when an endless belt with a crosspiece is manufactured by combining the above methods, the process of forming a long belt into an endless belt and the process of forming a crosspiece into the endless belt are separate processes, which increases the number of processes. There is a problem that work efficiency decreases.

  Therefore, an object of the present invention is to provide a method of forming a crosspiece on the belt surface while fusing both ends of a long belt with a simple method without increasing the number of steps.

  The manufacturing method of the belt with a crosspiece according to the present invention includes a first step of abutting end portions of the long belt material and arranging a molding member provided with a hole or a recess on the surface of the abutting portion; And a second step of forming the crosspiece on the surface of the butted portion by infiltrating the thermoplastic resin between the ends to fuse the ends together and filling the holes or recesses. To do.

  The long belt material preferably has a thermoplastic resin layer. In this case, in the second step, the thermoplastic resin of the thermoplastic resin layer is melted and enters between the end portions, and is filled in the holes or the recesses of the molded member.

  In the second step, it is preferable that the butted portion where the molded member is disposed on the surface is sandwiched between the lower mold and the upper mold in the thickness direction. Furthermore, in the second step, it is better to pressurize in the thickness direction while heating the butted portion. Moreover, it is preferable that a shaping | molding member is a release sheet which has a release property with respect to a thermoplastic resin.

  The hole of the molded member is, for example, a notch. Further, the butted portion and the molded member are arranged on a lower mold having a side wall, for example. In this case, it is preferable to arrange the molding member along the side wall so as to close the opening of the notch with the side wall. The lower mold includes, for example, a bottom portion that forms a groove and both side walls, and the butted portion and the molding member are arranged so as to be fitted into the groove.

  A belt with a crosspiece according to the present invention is a belt in which ends of a long belt material are butted together and the ends are fused with a thermoplastic resin, and is formed on the surface of the butted portion with a thermoplastic resin. A crosspiece is provided, and the crosspiece is formed integrally with a thermoplastic resin between end portions.

  The belt-equipped belt forming apparatus according to the present invention is a state in which both ends of a long belt material are butted together, and a thermoplastic resin is infiltrated between the both ends to melt the both ends. For forming a crosspiece on the surface, comprising a molding member disposed on the surface of the abutting portion, and an upper die and a lower die sandwiching the abutting portion where the molding member is disposed on the surface The molded member is provided with a hole or a recess for molding the crosspiece by being filled with a thermoplastic resin.

  According to the present invention, it is possible to form the crosspiece on the belt surface while fusing both ends of the belt with a simple method without increasing the number of steps.

It is typical sectional drawing which shows the structure of the belt material in 1st Embodiment. It is a perspective view which shows a state when the both ends of belt material are faced | matched. In 1st Embodiment, it is a perspective view which decomposes | disassembles and shows the shaping | molding apparatus when fuse | melting the both ends of a belt material. It is a top view which shows the state in which the belt material and the release sheet were attached to the jig. It is a perspective view of the belt with a crosspiece manufactured with the manufacturing method concerning a 1st embodiment. It is typical sectional drawing of the belt with a crosspiece manufactured with the manufacturing method which concerns on 1st Embodiment.

Embodiments of the present invention will be described below with reference to the drawings.
1 and 2 are diagrams showing a long belt material 10 for forming an endless flat belt. The belt material 10 includes a core canvas 11 constituting the core of the belt, a first thermoplastic resin layer 12, a first surface canvas 13, and a rubber layer that are sequentially laminated on one surface of the core canvas 11. 14, and a second thermoplastic resin layer 15 and a second surface canvas 16 that are sequentially laminated on the other surface of the core canvas 11. The 1st and 2nd thermoplastic resin layers 12 and 15 are comprised by thermoplastic resins, such as urethane and polyester.

  The belt surface 10A constituted by the rubber layer 14 forms a belt outer peripheral surface in an endless flat belt 30 with crosspieces (see FIGS. 5 and 6), and serves as a conveyance surface for conveying a conveyed product. The belt surface 10A has irregularities formed by weighting or the like in order to increase the grip force.

  Both ends 17 and 18 in the longitudinal direction of the long belt material 10 are processed into complementary shapes. In the present embodiment, both end portions 17 and 18 are formed in a finger shape (sawtooth shape) in which a plurality of peak portions 17M and 18M and valley portions 17N and 18N are alternately formed, for example.

  Next, a manufacturing method for obtaining an endless flat belt with crosspieces from the long belt material 10 will be described. In this method, as shown in FIG. 3, a molding apparatus 29 including a metal jig 20 including a lower mold 21 and an upper mold 22 and a releasable sheet 25 is used. The lower mold 21 includes a bottom portion 21A and both side walls 21B and 21B, and a groove 23 is formed by the bottom portion 21A and both side walls 21B and 21B. The groove 23 is for the belt material 10 to be fitted therein. The groove 23 has substantially the same width as the belt material 10 and extends linearly, and both ends of the groove 23 are open.

  As is apparent from FIGS. 2 and 3, both end portions 17 and 18 of the belt material 10 are abutted so that the crest portions 18M and 17M are fitted to the trough portions 17N and 18N, respectively. It is placed on the bottom 21 </ b> A and is fitted into the groove 23. At this time, the rubber layer 14 constituting the belt surface 10A is disposed on the upper surface side, and the belt surface 10A (upper surface) is flattened at the butting portion 19. Further, the end surfaces 17A and 18A of the both end portions 17 and 18 are arranged so as to contact each other, but there is a slight gap between the end surfaces 17A and 18A.

  In the groove 23, the releasable sheet 25 is placed on the surface 10 </ b> A of the butt portion 19. The releasable sheet 25 is a sheet-like member formed of rubber such as silicone rubber. The releasable sheet 25 has excellent releasability with respect to the rubber layer 14 constituting the belt surface 10A and the thermoplastic resin of the thermoplastic resin layers 12 and 15, and the belt end portions 17 and 18 are fused. Is not bonded to the belt surface 10A or the thermoplastic resin. The releasable sheet 25 secures the releasability between the upper mold 22 and the belt material 10 and prevents the molten resin from overflowing when both end portions 17 and 18 are fused. Also serves as a sealing member.

  The releasable sheet 25 has a substantially rectangular shape and has substantially the same width as the groove 23 so as to be fitted into the groove 23. Therefore, both side surfaces of the releasable sheet 25 are disposed along the inner surfaces of the side walls 21 </ b> B and 21 </ b> B together with the both side surfaces 10 </ b> S and 10 </ b> S of the belt material 10. The releasable sheet 25 has a length equal to or longer than the groove length, and is fitted from one end to the other end in the longitudinal direction of the groove 23 as shown in FIG.

  The releasable sheet 25 is provided with notches 26 and 26 at both ends (that is, both side portions) in the width direction. The notches 26, 26 have a rectangular shape extending in the longitudinal direction of the releasable sheet 25 and are arranged at the same position in the longitudinal direction of the sheet 25. As shown in FIG. 4, when the releasable sheet 25 is placed on the abutting portion 19, the notches 26 and 26 are disposed so as to straddle both end portions 17 and 18. In the present embodiment, the notches 26 and 26 are arranged on the end portions in the belt width direction of the both end surfaces 17A and 18A that are abutted (that is, the connection portions between the end surfaces 17A and 18A and the side surfaces 10S and 10S). Is done.

  The depth of the groove 23 is slightly larger than the sum of the thickness of the belt material 10 and the thickness of the releasable sheet 25. In the state where the butted portion 19 and the releasable sheet 25 are disposed in the groove 23, The upper surface 25A of the releasable sheet 25 is slightly recessed from the upper surfaces of the side walls 21B and 21B. The upper mold 22 is placed on the recessed portion, and the butt portion 19 is thereby entirely covered with the jig 20. The notches 26 and 26 are covered with the upper mold 21 and the belt material 10 from above and below, and the openings 26A and 26A are closed by the inner surfaces of the side walls 21B and 21B, so that the thermoplastic resin described later is filled. It becomes a hollow part for.

  The releasable sheet 25 is preferably provided with fine irregularities on the surface (upper surface 25 </ b> A) that is in close contact with the upper mold 22. By providing unevenness on the upper surface 25A, it is possible to prevent the belt from being unevenly formed by bubbles due to moisture contained in the thermoplastic resin layers 12 and 15 and gas generated by heating during heat fusion. In addition, when unevenness is provided on the belt surface 10A by weighting or the like, the surface (lower surface 25B) of the releasable sheet 25 that is in close contact with the belt surface 10A in order to prevent the unevenness from disappearing during heat fusion. It is better to have unevenness.

  The jig 20 includes a pressing device (not shown) provided with two heating plates (not shown) in a state where the abutting portion 19 and the releasable sheet 25 are disposed inside the groove 23 and the upper die 22 is placed thereon. (Not shown) is heated and pressurized. Specifically, each of the two heating plates of the press tool is disposed on the lower surface side of the lower die 21 and the upper surface side of the upper die 22, and the jig 20 is sandwiched from above and below by the two heated heating plates. It is. As a result, the butted portion 19 where the releasable sheet 25 is disposed on the surface 10A is sandwiched and pressed in the belt thickness direction by the lower mold 21 and the upper mold 22, and further the lower mold 21 and the upper mold 22 are pressed. It will be heated by a heating plate via.

  By such heating and pressing, at the butt portion 19, at least a part of the thermoplastic resin constituting the thermoplastic resin layers 12 and 15 (see FIG. 1) is melted. A part of the melted thermoplastic resin enters between the end surfaces 17A and 18A of the belt end portions 17 and 18. Further, when the molten thermoplastic resin is pressurized, a part of the molten thermoplastic resin overflows from the gap between the end faces 17A and 18A onto the belt surface 10A and fills the notches 26 and 26 (that is, the hollow portions). Is done. Thereafter, the heating by the heating plate is stopped, so that the molten thermoplastic resin is solidified, and as shown in FIGS. 5 and 6, an endless flat belt 30 with a crosspiece is obtained. The molten resin is prevented from flowing out of the notches 26 and 26 and between the end surfaces 17A and 18A by the side walls 21B and 21B and the release sheet 25.

  As shown in FIGS. 5 and 6, the flat belt 30 has both end portions 17 and 18 fused together by a thermoplastic resin 31 that has entered and solidified into the gap between the end surfaces 17A and 18A. Further, the thermoplastic resin filled in the notches 26 and 26 forms crosspieces 32 and 32 on the belt surface 10 </ b> A in the butt portion 19. Each crosspiece 32 is connected to the end portions in the belt width direction of both end surfaces 17A and 18A joined so as to straddle both end portions 17 and 18 (that is, the connection between the joined both end surfaces 17A and 18A and the belt side surface 10S). Part) overlaid on top.

  The crosspiece 32 is connected to the thermoplastic resin 31 that has entered the gap between the end faces 17A and 18A, and is formed integrally with the thermoplastic resin 31. Each crosspiece 32 has a rectangular shape extending in the belt longitudinal direction corresponding to the shape of each notch 26, and the height of the crosspiece 32 is substantially the same as the thickness of the releasable sheet 25, for example, about 1 mm. It becomes. In the present embodiment, the flat belt 30 is a conveying belt, and the crosspieces 32 and 32 are used, for example, to repel a conveyed product staying on the belt surface 10A.

  As described above, in the present embodiment, the crosspiece 32 can be formed while heat-bonding the belt end portions 17 and 18 without adding a new process. Further, since it is only necessary to provide the release sheet 25 with the notch 26 that can be easily formed by cutting or the like, the crosspiece 32 having an arbitrary size can be provided on the belt with a simple configuration. Furthermore, even if the belt surface 10A is not formed of a thermoplastic resin, a crosspiece can be formed on the belt surface 10A.

  In this embodiment, the releasable sheet 25 is provided with a notch for forming the crosspiece 32. However, a hole whose entire circumference is closed instead of the notch 26 may be provided. good. These holes and notches 26 penetrate in the thickness direction, but the crosspieces may be formed by recesses that do not penetrate in the thickness direction. The recess is provided on the lower surface 25B of the release sheet 25 facing the belt surface 10A.

  The releasable sheet 25 may be omitted, and a recess for forming a crosspiece may be provided on the lower surface of the upper mold 22. However, when the lower surface of the upper mold 22 is brought into close contact with the belt material 10 without using the releasable sheet 25, the molten thermoplastic resin or the belt surface 10A is bonded to the upper mold 22, and the jig 30 and the belt 30 are bonded. May be difficult to remove. Moreover, since it becomes difficult to shape | mold the crosspiece 32 of various dimensions, it is more preferable that the release sheet 25 is used.

  Further, the belt material 10 is not limited to the structure shown in FIG. 1 as long as a thermoplastic resin layer is provided. For example, the rubber layer 14 may be omitted. In this embodiment, the thermoplastic resin layer is provided in the belt material. However, a configuration in which the thermoplastic resin layer is provided in the belt outermost layer may be used. The belt material may be composed of a single thermoplastic resin layer.

DESCRIPTION OF SYMBOLS 10 Belt material 10A Surface 12, 15 1st and 2nd thermoplastic resin layer 17, 18 End part 17A, 18A End surface 19 Butting part 21 Lower mold | type 22 Upper mold | type 25 Release sheet (molding member)
26 Notch (hole)
30 Flat belt with pier 32 Pier

Claims (10)

A first step of abutting the end portions of the long belt material and arranging a molding member provided with a hole or a recess on the surface of the abutting portion;
A second step of infiltrating the molten thermoplastic resin between the end portions to fuse the end portions together and filling the holes or recesses to form a crosspiece on the surface of the butted portion; A method for manufacturing a belt with a cross, comprising: The long belt material has a thermoplastic resin layer,
In the said 2nd process, the thermoplastic resin of the said thermoplastic resin layer is fuse | melted, it penetrates between the said edge parts, and is filled with the said hole or recessed part, The belt with a crosspiece of Claim 1 characterized by the above-mentioned. Production method.   The crosspiece belt according to claim 1, wherein in the second step, the butted portion where the molding member is disposed on the surface is sandwiched in the thickness direction by a lower die and an upper die. Manufacturing method.   The method for manufacturing a belt with a crosspiece according to claim 1, wherein the molded member is a releasable sheet having releasability with respect to the thermoplastic resin.   The said hole is a notch, The manufacturing method of the belt with a crosspiece of Claim 1 characterized by the above-mentioned.   The abutting portion and the molding member are arranged on a lower mold having a side wall, and the molding member is arranged along the side wall so as to close the opening of the notch with the side wall. The method for manufacturing a belt according to claim 5.   The belt according to claim 6, wherein the lower mold includes a bottom portion and both side walls forming a groove, and the butted portion and the molding member are disposed so as to be fitted into the groove. Method.   The method for manufacturing a belt with a crosspiece according to any one of claims 1 to 7, wherein, in the second step, the butted portion is pressurized in the thickness direction while being heated. A belt in which the ends of the long belt material are abutted and the ends are fused with a thermoplastic resin,
A crosspiece belt having a crosspiece formed of a thermoplastic resin on a surface of the abutting portion, and the crosspiece is formed integrally with the thermoplastic resin between the end portions. In a state where both ends of a long belt material are butted together, a belt with a beam for infiltrating a thermoplastic resin between both ends and fusing both ends, and forming a beam on the surface of the butted portion The molding apparatus of
A molded member disposed on the surface of the butted portion;
An upper die and a lower die sandwiching the butted portion where the molding member is disposed on the surface;
A forming apparatus for a belt with a cross, wherein the molding member is provided with a hole or a recess for forming the cross section by being filled with the thermoplastic resin.

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