JP2016155688A - Conveyor belt and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an endless conveyor belt capable of preventing peeling of a non-adhesive layer at a joined part (tip part of zig-zag shape) joined by an abutting method even when a highly adhesive article is conveyed.SOLUTION: An endless conveyor belt 1 has one end 31 and the other end 32 of a belt body 2 in a longitudinal direction connected in which a non-adhesive layer 21 is stacked as a conveyance surface, and is characterized in that one end 31 and the other end 32 of the belt body 2 having the non-adhesive layer 21 stacked therein respectively have projected parts 31a and 32a and recessed parts 31b and 32b alternately provided along a width direction intersecting the longitudinal direction, the projected part 31a of one end 31 and the recessed part 32b of the other end and the recessed part 31b of one end 31 and the projected part 32a of the other end 32 are connected to fit to each other, and the tip parts 31c and 32c of the projected parts 31a and 32a are formed into circular arc shapes when seen from a direction orthogonal to the conveyance surface.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a transport belt used for transporting food and a manufacturing method thereof.

  For conveyor belts that convey high-temperature and highly-adhesive foods such as freshly cooked rice and cooked rice cakes, the conveyor surface increases the heat resistance of the conveyor surface. It is necessary to prevent it from becoming difficult to leave the surface. 2. Description of the Related Art A transport belt that has a non-adhesive resin layer (fluororesin) coated with a transport surface is known as a transport belt that has improved transport surface non-adhesiveness (easy separation of transported objects from the transport surface). (Prior Document 1).

  In general, the conveying belt is used in an endless manner by joining both end portions thereof. At this time, as a method for joining both ends, there are known a method in which ends of both ends are overlapped and joined, and a method in which both ends are cut into a zigzag shape (lightning shape, finger shape) and butt joined together. (See FIG. 12). In the superposition method, the joint portion becomes thick and the rigidity is increased, so that the flexibility of the conveying belt is lowered. On the other hand, the butting method is suitably used because the joining portions do not overlap and the conveyor belt does not become thicker and the flexibility is good (prior art document 2).

Japanese Patent No. 2542770 JP 2009-197896 A

  However, in a conveyor belt with a non-adhesive resin layer (non-adhesive layer) coated on the conveyor surface, the resin layer that forms the conveyor surface is a non-adhesive material. Low adhesion. Therefore, if the joining method of the both ends of the conveyor belt is the butting method, especially in a layout in which the conveyor belt is bent greatly, such as a conveyor having a small-diameter pulley or a knife edge, the conveyor belt wraps around the pulley and becomes large. When bending, the non-adhesive layer easily peels off at the zigzag tip.

  Accordingly, the present invention provides an endless transport belt that does not cause peeling of the non-adhesive layer at the joint (zigzag tip) joined by the butt method even when transported with a highly adhesive transport. The purpose is to do.

The present invention is an endless transport belt in which one end and the other end of a belt body in which a non-adhesive layer serving as a transport surface is laminated are connected,
The one end and the other end of the belt main body on which the non-adhesive layer is laminated respectively have a convex portion and a concave portion provided alternately along the width direction intersecting the longitudinal direction, The concave portion at the other end, and the concave portion at the one end and the convex portion at the other end are connected to each other,
The tip of the convex portion is characterized in that it has an arc shape when viewed from a direction orthogonal to the transport surface.

  According to the said structure, when the front-end | tip part of the convex part fitted when connecting the one end and other end of the belt main body on which the non-adhesion layer was laminated | stacked has formed circular arc shape, the front-end | tip part of a convex part is The contact area of the non-adhesive layer with respect to the belt main body portion at the tip portion is increased as compared with a sharp shape (for example, a triangular shape). As a result, even if the tip of the convex portion bends during use of the conveyor belt, stress concentration on the tip of the convex portion can be suppressed, and the non-adhesive layer peels off from the belt body starting from the tip of the convex portion. Can be prevented.

  Further, according to one aspect of the present invention, in the conveyor belt, a tip portion of the convex portion of the belt main body on which the non-adhesive layer is laminated has a perfect circle shape with a radius of 0.5 to 2.0 mm. It is characterized by.

  According to the above configuration, since the tip of the convex portion has a perfect circle shape with a radius of 0.5 to 2.0 mm, the stress on the tip of the convex portion is not concentrated but is evenly distributed. It is possible to further prevent the non-adhesive layer from being peeled off from the belt main body starting from the tip of the portion.

  One of the present invention is characterized in that the non-adhesive layer is formed of a resin in the conveyor belt.

  By using a resin for the non-adhesive layer as described above, a transport surface excellent in non-adhesiveness can be obtained.

  One of the present invention is characterized in that the non-adhesive layer is formed of a fluororesin in the conveyor belt.

  By using a fluororesin in the non-adhesive layer as described above, it is possible to make the transport surface excellent in heat resistance in addition to non-adhesiveness.

  Moreover, one of the present invention is characterized in that, in the transport belt, the non-adhesive layer is a film-like fluororesin layer.

Generally, when the non-adhesive layer becomes thick, the non-adhesive layer becomes hard, and therefore, the non-adhesive layer is easily peeled off from the belt main body due to the bending of the conveyance belt.
Therefore, as described above, the thickness of the non-adhesive layer can be reduced by making the non-adhesive layer into a film-like fluororesin layer. Thereby, since a non-adhesion layer can be made thin, it can suppress that a non-adhesion layer peels from a belt main body by the bending of a conveyance belt.

  One of the present invention is characterized in that, in the transport belt, the non-adhesive layer has a thickness of 1.0 to 20 mil.

  If the thickness of the non-adhesive layer is thinner than 1.0 mil (about 25 μm), the durability is inferior, and if it is thicker than 20 mil (about 508 μm), the flexibility is inferior. Therefore, the durability and flexibility of the non-adhesive layer can be maintained by making the thickness of the non-adhesive layer in the range of 1.0 to 20 mil as described above.

Moreover, one of the present invention is the above conveyor belt, wherein the belt body is
The non-adhesive layer;
A first core canvas layer laminated on the lower layer of the non-adhesive layer is laminated.

  According to the said structure, a belt main body can be comprised with a non-adhesion layer and a 1st core body canvas layer, and the thickness of a conveyance belt is made thin and it is excellent in flexibility.

Moreover, one of the present invention is the above conveyor belt, wherein the belt body is
The non-adhesive layer;
A first resin layer laminated under the non-adhesive layer;
A first core canvas layer disposed below the first resin layer is laminated.

  According to the said structure, a conveyance surface becomes soft by providing a 1st resin layer between the non-adhesion layer of a belt main body, and a 1st core body canvas layer, and the damage of a conveyed product can be prevented.

Moreover, one of the present invention is the above conveyor belt, wherein the belt body further includes:
A second resin layer laminated on the lower layer of the first core canvas layer;
A second core canvas layer disposed below the second resin layer is laminated.

  According to the above configuration, the belt main body further includes the second resin layer and the second core canvas layer, whereby the belt strength of the conveyance belt can be increased.

Further, according to one aspect of the present invention, in the conveyor belt, a gap is formed between a tip portion of the non-adhesive layer of the convex portion and the concave portion fitted to the convex portion, respectively.
The first core canvas layer includes an adhesive, and the adhesive oozes into the gap.

  According to the said structure, a clearance gap is provided between the front-end | tip part in the non-adhesion layer of a convex part, and the recessed part fitted to this convex part, and it adheres to this clearance gap with a 1st core body canvas layer and a non-adhesion layer. Let the adhesive used ooze out. Thereby, the adhesive that has exuded into the gap covers the side surface of the non-adhesive layer, this adhesive serves as a cushion for the non-adhesive layer, relieves stress on the tip of the convex portion in the non-adhesive layer, The lifting from the bottom of the non-adhesive layer can be suppressed, and the peeling of the non-adhesive layer from the belt body starting from the tip of the convex portion can be further prevented.

Further, according to one aspect of the present invention, in the conveyor belt, a gap is formed between a tip portion of the non-adhesive layer of the convex portion and the concave portion fitted to the convex portion, respectively.
The first resin layer oozes into the gap.

  According to the said structure, a clearance gap is provided between the front-end | tip part in the non-adhesion layer of a convex part, and the recessed part fitted to this convex part, and the resin component of a 1st resin layer is oozed out in this clearance gap. As a result, the resin component of the first resin layer that has exuded into the gap covers the side surface of the non-adhesive layer, so that the first resin layer serves as a cushion for the non-adhesive layer, and the tip of the convex portion in the non-adhesive layer It is possible to relieve the stress on the non-adhesive layer, suppress the lifting from below the non-adhesive layer, and further prevent the non-adhesive layer from peeling off from the belt body starting from the tip of the convex portion.

  Moreover, one of the present invention is characterized in that the width of the gap in the longitudinal direction is 0.1 to 1.0 mm in the conveyor belt.

  By setting the width of the belt body in the longitudinal direction of the gap to be in the range of 0.1 to 1.0 mm, the amount of bleeding of the adhesive or resin that oozes from the gap is suitable for bearing cushioning properties against the non-adhesive layer. Can be in quantity.

  One of the present invention is characterized in that, in the transport belt, the first resin layer and the second resin layer are a thermoplastic resin or a thermoplastic elastomer.

  According to the said structure, the 1st resin layer and the 2nd resin layer can be made the structure excellent in workability and intensity | strength.

  One of the present invention is characterized in that, in the transport belt, the adhesive contained in the first core canvas layer is a thermoplastic resin or a thermoplastic elastomer.

  According to the said structure, a 1st core body canvas can be made into the structure excellent in workability and intensity | strength.

  One of the present invention is characterized in that, in the transport belt, the thermoplastic resin or the thermoplastic elastomer is a polyether-based polyurethane or a polycarbonate-based polyurethane.

  According to the said structure, it is excellent in cost performance.

One of the present invention is a belt body in which a non-adhesive layer serving as a conveying surface and a first core canvas or first resin layer subjected to adhesion treatment are laminated, and one end and the other end in the longitudinal direction are formed as a recess. Convex and concave portion processing step for processing the tip portion to have an arc shape and alternately arranged along the width direction intersecting the longitudinal direction,
A fitting step in which the convex portion at the one end and the concave portion at the other end, and the concave portion at the one end and the convex portion at the other end are brought into contact with each other;
A heat fusion process in which the convex part and the concave part fitted in the fitting process are heat-pressed in a thickness direction of the belt main body by a heat press, and one end and the other end of the belt main body are thermally fused and connected. And a method for manufacturing a conveyor belt.

  According to the above manufacturing method, the tip of the convex portion to be fitted when connecting one end and the other end of the belt main body on which the non-adhesive layer is laminated has an arc shape. The contact area of the non-adhesive layer with respect to the belt main body portion at the tip end portion is increased as compared with those having a pointed shape (for example, a triangular shape). As a result, even if the tip of the convex portion bends during use of the conveyor belt, stress concentration on the tip of the convex portion can be suppressed, and the non-adhesive layer peels off from the belt body starting from the tip of the convex portion. It is possible to manufacture a conveyor belt that can prevent the above.

One of the present invention is a belt body in which a non-adhesive layer serving as a conveying surface and a first core canvas or first resin layer subjected to adhesion treatment are laminated, and one end and the other end in the longitudinal direction are formed as a recess. Processing is performed such that convex portions having a circular arc shape at the tip portion are alternately arranged along the width direction intersecting the longitudinal direction, and the tip portion and the convex portion in the non-adhesive layer of the convex portion An uneven portion processing step for processing so that a gap is formed between each of the recessed portions to be fitted,
The convex portion at the one end and the concave portion at the other end, and the concave portion at the one end and the convex portion at the other end are brought into contact with each other, and fitted to the leading end portion of the non-adhesive layer of the convex portion and the convex portion. A fitting step of fitting so that there is a gap between each of the recesses;
The convex portion and the concave portion fitted in the fitting step are heat-pressed by heat press in the belt body thickness direction, and the adhesive component of the first core canvas or the first resin layer is inserted into the gap. A method of manufacturing a conveyor belt, comprising: a heat-sealing step in which one end and the other end of the belt main body are thermally fused and connected in a state where the resin component is leached and the gap is filled. is there.

  It is possible to provide an endless transport belt in which a non-adhesive layer does not peel off at a joint (zigzag tip) joined by a butting method even when a highly tacky transport is transported.

It is a schematic explanatory drawing of the conveyance belt which concerns on Embodiments 1-3. It is sectional drawing of the circumferential direction of the conveyance belt which concerns on Embodiment 1-3. It is a schematic explanatory drawing of the conveyance belt which concerns on Embodiment 4-6. It is sectional drawing of the circumferential direction of the conveyance belt which concerns on Embodiment 4-6. It is explanatory drawing of the manufacturing method of the conveyance belt which concerns on Embodiment 1-3. It is explanatory drawing of the manufacturing method of the conveyance belt which concerns on Embodiment 4-6. 6 is an explanatory diagram of a conveyance belt according to Example 1 and Comparative Example 1. FIG. It is explanatory drawing of the running test machine used for a running test. It is explanatory drawing of the analysis method of a finite element method analysis (FEM). It is an analysis result of a finite element method analysis (FEM). It is an analysis result of a finite element method analysis (FEM). It is the schematic of the conventional conveyance belt. FIG. 10 is a schematic explanatory diagram of a conveyance belt according to a seventh embodiment. 10 is an explanatory diagram of a method for manufacturing a conveyor belt according to Embodiment 7. FIG. FIG. 10 is an explanatory diagram of a conveyance belt according to an eleventh embodiment. It is explanatory drawing of the driving | running | working testing machine used for the driving | running | working test when a foreign material is inserted | pinched.

(Embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Outline of conveyor belt 1)
The conveyor belt 1 according to the present embodiment is a flat belt made endless by joining both end portions of a long belt-like belt main body. As shown in FIG. 1, the conveyance belt 1 includes a driving pulley 11 and a driven pulley 12. Used in between. Thereby, a transported object (article) such as food is placed on the transport surface of the transport belt 1 and can be transported from the driven pulley 12 side to the drive pulley 11 side.

(Embodiment 1)
In FIG. 1, the side view and top view of the conveyance belt 1 which concern on Embodiments 1-3 are shown. FIG. 2 shows an XX cross-sectional view in the circumferential direction of the conveyor belt 1 according to the first to third embodiments. In the sectional view of the conveyor belt 1 shown in FIG. 2, the upper side of the figure is the outer peripheral side (conveying surface side) on which the object is placed, and the lower side is the inner peripheral side (surface side in contact with the drive pulley 11 and the driven pulley 12) The depth direction in the figure is the width direction of the conveyor belt 1.

  As shown in FIGS. 1 and 2, in the conveyance belt 1 of Embodiment 1, one end 31 and the other end 32 in the longitudinal direction of a belt body 2 on which a non-adhesive layer 21 serving as a conveyance surface is laminated are connected. One end 31 and the other end 32 of the belt main body 2 have convex portions 31a and 32a and concave portions 31b and 32b that are alternately provided along the width direction intersecting the longitudinal direction. The concave portion 32b of the other end 32, the concave portion 31b of the one end 31 and the convex portion 32a of the other end 32 are arranged so as to be fitted to each other, and are connected by pressure bonding by heating and pressing.

(Belt body 2)
As shown in FIG. 2, the belt body 2 includes a non-adhesive layer 21 and a core canvas 22 (first core canvas layer) in order from the outer peripheral side (conveying surface side) to the inner peripheral side of the conveyor belt 1. It is configured by stacking.

  Since the non-adhesive layer 21 is a conveyance surface that comes into direct contact with the conveyed product, when the conveyed item is high-temperature and highly sticky food such as freshly cooked rice or cooked rice cake, the heat-resistant surface of the conveyance surface. In addition to improving the properties, a material excellent in non-adhesiveness, in particular, in which the conveyed product is difficult to adhere to the conveying surface is used. For example, a resin such as a fluororesin or a silicone resin can be used for the non-adhesive layer 21, but a fluororesin excellent in non-adhesiveness is preferable. Examples of fluororesins include PTFE (polytetrafluoroethylene), PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer), and PCTFE (polychlorotrifluoroethylene). PTFE is preferable from the viewpoint of excellent properties.

  As a means for forming the non-adhesive layer 21, there is a means for laminating a fluororesin formed in a film shape (or a sheet shape) on the core canvas 22. In general, when the non-adhesive layer 21 becomes thick, the non-adhesive layer 21 becomes hard, so that the non-adhesive layer 21 is easily peeled off from the belt body 2 due to the bending of the conveyor belt 1. Therefore, as described above, the thickness of the non-adhesive layer 21 can be reduced by making the non-adhesive layer 21 into a film-like fluororesin layer. Thereby, since the non-adhesive layer 21 can be made thin, it can suppress that the non-adhesive layer 21 peels from the belt main body 2 by the bending of the conveyance belt 1. In addition, as a means for forming the non-adhesive layer 21, there is a means for applying a dispersion in which fluororesin particles are dispersed in water to the surface of the core canvas 22.

  Moreover, it is preferable to form the thickness of the non-adhesion layer 21 in the range of 1.0-20 mil (1 mil = 1/1000 inch). If the thickness of the non-adhesive layer 21 is thinner than 1.0 mil (about 25 μm), the durability is inferior, and if it is thicker than 20 mil (about 508 μm), the flexibility is inferior. Therefore, the durability and flexibility of the non-adhesive layer 21 can be maintained by setting the thickness of the non-adhesive layer 21 in the range of 1.0 to 20 mil as described above.

  The core canvas 22 (first core canvas layer) is a woven fabric (plain weave, twill weave, satin weave, etc.) woven by crossing warp and weft. For example, it is possible to use a plain woven fabric in which warp yarns and weft yarns are crossed at substantially right angles. Polyester fiber, polyamide fiber, cotton fiber or the like is used as the material for the warp / weft. The warp / weft may be a multifilament obtained by twisting filaments (long fibers), or a monofilament, or a spun yarn obtained by twisting short fibers (spun yarn). The fineness of the warp and weft is 500 to 1500 dtex for filament yarn (5 to 22 in the case of span yarn). The warp density is 70-150 yarns / 5 cm, and the weft density is 45-80 yarns / 5 cm.

  The thickness of the core canvas 22 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 22 is thinner than 0.5 mm, the strength and durability of the belt necessary for conveying articles cannot be secured, and if it is thicker than 1.2 mm, the flexibility is lowered. is there.

  Further, the core canvas 22 is subjected to an adhesion treatment in order to improve the adhesion with the non-adhesive layer 21. The adhesion treatment is performed by coating the core canvas 22 with an adhesive dissolved in an organic solvent or immersing the core canvas 22 in the adhesive. The adhesive is preferably a thermoplastic resin or thermoplastic elastomer excellent in processability and strength, and the thermoplastic resin or thermoplastic elastomer is preferably a polyether polyurethane or a polycarbonate polyurethane, particularly a polyether polyurethane elastomer. Is preferably dissolved in a mixed solvent of methyl ethyl ketone / cyclohexane / tetrahydrofuran.

(One end 31 and the other end 32 of the belt main body 2: joint part)
As shown in FIG. 2, the convex part 31a and the concave part 31b formed at one end 31 of the belt body 2 have a zigzag shape (lightning shape, finger shape). Further, the convex portion 32a and the concave portion 32b formed at the other end 32 of the belt main body 2 are also zigzag shaped. The convex portion 31a and the concave portion 31b, and the convex portion 32a and the concave portion 32b are formed in a zigzag shape so that both ends in the longitudinal direction of the belt main body 2 are fitted to each other by cutting with an X and Y axis cutting plotter or a punching machine. It is formed to have a (lightning shape).

  Further, as shown in FIG. 1, the tip portions 31c of the convex portions 31a and 32a have an arc shape when viewed from the direction orthogonal to the transport surface. In this embodiment, it is preferable that the front-end | tip part 31c of convex part 31a * 32a is perfect circle shape, and the radius R has the roundness in the range of 0.5-2.0 mm.

  Further, the belt body 2 has a zigzag-shaped convex portion 31a at one end 31 and a concave portion 32b at the other end 32, and a concave portion 31b at one end 31 and a convex portion 32a at the other end 32 which are brought into contact with each other, and The main body 2 is connected by being heat-pressed in the thickness direction of the main body 2 by a hot press and fusing the one end 31 and the other end 32 of the belt main body 2 together.

  According to the above configuration, the tip portions 31c and 32c of the convex portions 31a and 32a to be fitted when connecting the one end 31 and the other end 32 of the belt body 2 on which the non-adhesive layer 21 is laminated have an arc shape. As a result, the contact area of the non-adhesive layer 21 with respect to the belt main body 2 at the tip portions 31c and 32c is increased as compared with a shape in which the tip portions of the convex portions 31a and 32a have a pointed shape (for example, a triangular shape). As a result, even if the tip portions 31c and 32c of the convex portions 31a and 32a are bent when the transport belt 1 is used, stress concentration on the tip portions 31c and 32c of the convex portions 31a and 32a can be suppressed, and the convex portions 31a and 32a It is possible to prevent the non-adhesive layer 21 from being peeled off from the belt body 2 starting from the tip portions 31c and 32c.

  Further, since the tip portions 31c and 32c of the convex portions 31a and 32a have a perfect circle shape with a radius of 0.5 to 2.0 mm, stress on the tip portions 31c and 32c of the convex portions 31a and 32a is not concentrated. Since it is evenly distributed, it is possible to further prevent the non-adhesive layer 21 from being peeled off from the belt body 2 starting from the tip portions 31c and 32c of the convex portions 31a and 32a.

  Moreover, according to the said structure, the belt main body 2 can be comprised by the layer of the non-adhesion layer 21 and the core canvas 22, and it can be set as the conveyance belt 1 excellent in the flexibility which made thickness thin.

(Embodiment 2)
As shown in FIG. 2, the conveyance belt 1 of the second embodiment includes a non-adhesive layer 21 and a first resin layer 23 in which the belt body 2 is sequentially from the outer peripheral side (conveying surface side) to the inner peripheral side of the conveyance belt 1. And a core canvas 22 (first core canvas layer) are laminated. Other configurations are the same as those in the first embodiment.

  The first resin layer 23 is formed of a thermoplastic resin or thermoplastic elastomer made of polyurethane, polyolefin such as polyethylene / polypropylene, or polyester. In particular, a thermoplastic polyurethane resin / elastomer excellent in processability and strength, and a polyether polyurethane excellent in hydrolysis resistance and a polycarbonate polyurethane excellent in heat resistance and chemical resistance are preferable. The 1st resin layer 23 laminated | stacked on the lower layer of the non-adhesion layer 21 is provided in order to soften the conveyance surface of the non-adhesion layer 21, and to prevent the damage of a conveyed product. In addition, if the material (for example, fluororesin) used for the non-adhesive layer 21 is expensive, if the non-adhesive layer 21 is thickened in order to improve the cushioning property of a conveyance surface, cost will increase. Therefore, the manufacturing cost can be reduced by using an inexpensive and flexible material for the first resin layer 23 and laminating it between the non-adhesive layer 21 and the core canvas 22.

  Moreover, the thickness of the 1st resin layer 23 has the preferable range of 0.3-0.5 mm. This is because if the thickness of the first resin layer 23 is thinner than 0.3 mm, the cushioning property of the transport surface cannot be sufficiently secured, and if it is thicker than 0.5 mm, the flexibility is lowered.

(Embodiment 3)
As shown in FIG. 2, the conveyor belt 1 according to the third embodiment includes a belt main body 2 in order from the outer peripheral side (conveying surface side) to the inner peripheral side of the conveyor belt 1, and the first adhesive layer 21 and the first resin layer 23. The core canvas 22 (first core canvas layer), the second resin layer 25, and the core canvas 24 (second core canvas layer) are laminated. Other configurations are the same as those of the second embodiment.

  Similar to the first resin layer 23, the second resin layer 25 is made of a thermoplastic resin or thermoplastic elastomer made of polyurethane, polyolefin such as polyethylene / polypropylene, or polyester. Further, the thickness of the second resin layer 25 is preferably in the range of 0.3 to 0.5 mm, like the first resin layer 23.

  The core canvas 24 is a woven cloth (plain weave, twill weave, satin weave, etc.) woven by crossing warp and weft like the core canvas 22.

  As described above, the belt main body 2 includes the second resin layer 25 and the core body canvas 24 in addition to the first resin layer 23 and the core body canvas 22, thereby increasing the belt strength of the transport belt 1. it can.

(Embodiment 4)
As shown in FIG. 4, the conveyor belt 1 according to the fourth embodiment includes a belt main body 2 in order from the outer peripheral side (conveying surface side) to the inner peripheral side of the conveyor belt 1, and the non-adhesive layer 21 and the core canvas 22 ( 1st core body canvas layer) is laminated | stacked and comprised (structure similar to Embodiment 1). And as shown in FIG.3 and FIG.4, between the front-end | tip part 31c in the non-adhesion layer 21 of the convex part 31a of the one end 31 of the belt main body 2, and the recessed part 32b fitted to the convex part 31a, and the belt main body 2 Clearances 35 are formed between the tip 32c of the non-adhesive layer 21 of the convex portion 32a of the other end 32 and the concave portion 31b fitted to the convex portion 32a. Adhesive contained in the core canvas 22 laminated on the lower layer of the non-adhesive layer 21 is oozed into the gap 35 to fill the gap 35.

  Thus, the gap 35 is provided, the adhesive contained in the core canvas 22 is oozed into the gap 35, and the adhesive covers the side surface of the non-tacky layer 21. 21 plays a role of a cushion for the non-adhesive layer 21, relieves stress on the tip portions 31c and 32c of the convex portions 31a and 32a, suppresses lifting from the bottom of the non-adhesive layer 21, and prevents the convex portions 31a and 32a from It is possible to further prevent the non-adhesive layer 21 from being peeled off from the belt body 2 starting from the tip portions 31c and 32c.

  As for the size of the gap 35, as shown in FIG. 3, the width A (width in the longitudinal direction) between the tip 31c of the protrusion 31a and the recess 32b is in the range of 0.1 to 1.0 mm. It is preferable. By setting the width A in the range of 0.1 to 1.0 mm, the amount of the adhesive that exudes from the gap 35 can be set to an appropriate amount to provide cushioning properties for the non-adhesive layer.

  As a method for providing the gap 35 in the non-adhesive layer 21, there is a method in which both ends (one end 31 and the other end 32) of the belt main body 2 are slightly separated and abutted to provide the gap 35. In addition, as a method of providing the gap 35 in the non-adhesive layer 21, the tip portions 31 c of the non-adhesive layer 21 of the convex portions 31 a and 32 a at both ends of the belt body 2 are slightly cut (the size of the gap 35 is reduced). There is a method of forming a gap 35 when the one end 31 and the other end 32 are abutted.

(Embodiment 5)
As shown in FIG. 4, in the conveyance belt 1 of Embodiment 5, the belt main body 2 has a non-adhesive layer 21 and a first resin layer 23 in order from the outer peripheral side (conveying surface side) to the inner peripheral side of the conveyor belt 1. And a core canvas 22 (first core canvas layer) are laminated. Other configurations are the same as those in the fourth embodiment.

  As in the second embodiment, the first resin layer 23 is formed of a thermoplastic resin or thermoplastic elastomer made of polyurethane, polyolefin such as polyethylene / polypropylene, or polyester. In particular, a thermoplastic polyurethane resin / elastomer excellent in processability and strength, and a polyether polyurethane excellent in hydrolysis resistance and a polycarbonate polyurethane excellent in heat resistance and chemical resistance are preferable. The 1st resin layer 23 laminated | stacked on the lower layer of the non-adhesion layer 21 is provided in order to soften the conveyance surface of the non-adhesion layer 21, and to prevent the damage of a conveyed product. Moreover, the thickness of the 1st resin layer 23 has the preferable range of 0.3-0.5 mm. This is because if the thickness of the first resin layer 23 is thinner than 0.3 mm, the cushioning property of the transport surface cannot be sufficiently secured, and if it is thicker than 0.5 mm, the flexibility is lowered.

  And as shown in FIG.3 and FIG.4, between the front-end | tip part 31c in the non-adhesion layer 21 of the convex part 31a of the one end 31 of the belt main body 2, and the recessed part 32b fitted to the convex part 31a, and the belt main body 2 Clearances 35 are formed between the tip 32c of the non-adhesive layer 21 of the convex portion 32a of the other end 32 and the concave portion 31b fitted to the convex portion 32a. A resin component of the first resin layer 23 laminated on the lower layer of the non-adhesive layer 21 is oozed into the gap 35 to fill the gap 35.

  The resin component of the first resin layer 23 that exudes from the gap 35 may spread and exude on the conveyance surface of the non-adhesive layer 21. Further, the ease with which the resin component that exudes from the gap 35 can be exuded can be changed by adjusting the fluidity of the resin component.

  Thus, the gap 35 is provided, and the resin component of the first resin layer 23 oozes out into the gap 35 so that the resin component covers the side surface of the non-adhesive layer 21, so that the resin component is a cushion against the non-adhesive layer 21. The stress on the tip portions 31c and 32c of the convex portions 31a and 32a in the non-adhesive layer 21 is relieved, the lifting from the bottom of the non-adhesive layer 21 is suppressed, and the tip portions 31c of the convex portions 31a and 32a are suppressed. It is possible to further prevent the non-adhesive layer 21 from peeling from the belt body 2 starting from 32c.

(Embodiment 6)
As shown in FIG. 4, in the conveyance belt 1 of Embodiment 6, the belt main body 2 has a non-adhesive layer 21 and a first resin layer 23 in order from the outer peripheral side (conveying surface side) to the inner peripheral side of the conveyance belt 1. The core canvas 22 (first core canvas layer), the second resin layer 25, and the core canvas 24 (second core canvas layer) are laminated. Other configurations are the same as those of the fifth embodiment.

  Similar to the first resin layer 23, the second resin layer 25 is made of a thermoplastic resin or thermoplastic elastomer made of polyurethane, polyolefin such as polyethylene / polypropylene, or polyester. Further, the thickness of the second resin layer 25 is preferably in the range of 0.3 to 0.5 mm, like the first resin layer 23.

  The core canvas 24 is a woven cloth (plain weave, twill weave, satin weave, etc.) woven by crossing warp and weft like the core canvas 22.

  As described above, the belt main body 2 includes the second resin layer 25 and the core body canvas 24 in addition to the first resin layer 23 and the core body canvas 22, thereby increasing the belt strength of the transport belt 1. it can.

(Embodiment 7)
As shown in FIG. 13, the conveyor belt 1 according to the seventh embodiment includes a belt main body 2 and a non-adhesive layer 21 in order from the outer peripheral side (conveying surface side) to the inner peripheral side of the conveyor belt 1. The first resin layer 23, the core canvas 22 (first core canvas layer), the second resin layer 25, and the core canvas 24 (second core canvas layer) are laminated. .

  And as shown in FIG.13 and FIG.14, the conveyance belt 1 of Embodiment 7 is formed in the one end 31 of the belt main body 2 in two steps with the lower layer protruding, and further, the two steps formed. A plurality of convex portions 31a and 31c and a plurality of concave portions 31b and 31d each having a zigzag shape (lightning shape and finger shape) are formed, and an upper layer protrudes from the other end 32 of the belt body 2. Further, a plurality of convex portions 32a and 32c and a plurality of concave portions 32b and 32d each having a zigzag shape (lightning shape, finger shape) are formed on each of the two steps formed. The plurality of convex portions 31 a on the upper layer of the one end 31 of the belt body 2 and the plurality of concave portions 32 b on the upper layer of the other end 32, and the plurality of concave portions 31 b on the upper end of the one end 31 and the plurality of convex portions of the upper layer on the other end 32. Similarly, the plurality of protrusions 31c in the lower layer of the one end 31 of the belt main body 2, the plurality of recesses 32d in the lower layer of the other end 32, and the plurality of recesses 31d in the lower layer of the one end 31 are similarly fitted. And a plurality of protrusions 32c on the lower layer of the other end 32 are brought into contact with each other and fitted together, and heat-pressed in the thickness direction of the belt body 2 with a hot press, so that the one end 31 and the other end 32 of the belt body 2 are fused. It joins by doing (step joining method).

  The upper layer and the lower layer of the one end 31 of the belt body 2 are divided into two stages at the central portion of the second resin layer 25. Similarly, the upper layer and the lower layer of the other end 32 of the belt main body 2 are also divided into two stages at the central portion of the second resin layer 25.

  In addition, the tip of the convex portion 31a at the upper layer of the one end 31 and the convex portion 32a at the upper layer of the other end 32 of the belt body 2 has an arc shape when viewed from the direction orthogonal to the conveying surface. Corresponding to the convex portion 31a and the convex portion 32a having the arc shape, the concave portion 32b at the other end 32 and the concave portion 31b at the one end 31 also have an arc shape. On the other hand, the lower end convex portion 31c at one end 31 of the belt main body 2 and the lower end convex portion 32c at the other end 32 have a triangular shape. Corresponding to the triangular convex portion 31c and convex portion 32c, the concave portion 32d at the other end 32 and the concave portion 31d at the one end 31 are also triangular.

  In the seventh embodiment, the lower end convex portion 31c at one end 31 of the belt main body 2 and the lower end convex portion 32c at the other end 32 may have an arc shape. In this case, the concave portion 32d at the other end 32 and the concave portion 31d at the one end 31 are also formed in an arc shape corresponding to the convex portion 31c and the convex portion 32c having the circular arc shape.

  In the conveyance belt of the joining method that does not provide the step as described above in the longitudinal direction of the belt, when the foreign material adheres to the inner peripheral surface of the conveyance belt, the foreign material is sandwiched between the conveyance belt and the pulley, In some cases, local stress is applied to the joint between the one end and the other end of the conveyor belt, and the connecting portion is broken. Therefore, by providing a step at the junction between the one end and the other end of the conveyor belt (step junction method), compared to the case without a step, local stress concentration at the junction is alleviated and the junction is less likely to break. can do.

(Manufacturing method of conveyance belt of embodiment 1)
With reference to FIG. 5, the manufacturing method of the conveyance belt 1 which concerns on Embodiment 1 is demonstrated.

  First, an adhesive in which a thermoplastic elastomer is dissolved in an organic solvent is prepared, and this adhesive is applied to a canvas material (a plain weave cloth), or an adhesive treatment is performed by immersing the canvas material in the adhesive, and a predetermined dimension. The core canvas 22 is produced by cutting the core.

  Then, a fluororesin (PTFE) film (non-adhesive layer 21) is laminated on the conveying surface side of the core canvas 22 to produce an end-like long belt body 2 (end-long belt making process). .

  Next, one end 31 and the other end 32 in the longitudinal direction of the belt main body 2 in which the non-adhesive layer 21 and the core canvas 22 are laminated are cut with a X- and Y-axis cutting plotter, a punching machine, or the like to form a zigzag shape. Processing to form (lightning shape) (uneven portion processing step). Thereby, the one end 31 of the belt main body 2 is processed into a shape in which convex portions 31a and concave portions 31b each having a zigzag shape are alternately arranged along the width direction. The other end 32 of the belt body 2 is also processed into a shape in which convex portions 32a and concave portions 32b each having a zigzag shape are alternately arranged along the width direction.

  Moreover, in the uneven | corrugated | grooved part processing process, when the one end 31 and the other end 32 of the belt main body 2 are cut | judged with a X, Y-axis cutting plotter, a punching machine, etc., the front-end | tip part 31c of convex part 31a * 32a is a conveyance surface. Is processed so that the shape when viewed from a direction orthogonal to the arc shape. The recesses 31b and 32b are also processed into an arc shape corresponding to the arcuate tip portion 31c.

  Next, the convex part 31a of the one end 31 and the concave part 32b of the other end 32 of the belt body 2 and the concave part 31b of the one end 31 and the convex part 32a of the other end 32 are brought into contact with each other (fitting process).

  The convex portions 31a and 32a and the concave portions 31b and 32b fitted in the fitting step are heat-bonded in the thickness direction of the belt body 2 by a heat press machine, and the one end 31 and the other end 32 of the belt body 2 are heat-sealed. To connect (thermal fusion process). The conveyor belt 1 is obtained through such steps.

  According to the manufacturing method described above, the tip portions 31c and 32c of the convex portions 31a and 32a to be fitted when the one end 31 and the other end 32 of the belt main body 2 on which the non-adhesive layer 21 is laminated have an arc shape. As a result, the contact of the non-adhesive layer 21 to the belt body 2 at the tip portions 31c and 32c is higher than that in which the tip portions 31c and 32c of the convex portions 31a and 32a have a sharp shape (for example, a triangular shape). The area increases. As a result, even if the tip portions 31c and 32c of the convex portions 31a and 32a are bent when the transport belt 1 is used, stress concentration on the tip portions 31c and 32c of the convex portions 31a and 32a can be suppressed, and the convex portions 31a and 32a The conveyance belt 1 that can prevent the non-adhesive layer 21 from being peeled off from the belt body 2 starting from the tip portions 31c and 32c can be manufactured.

(Manufacturing method of conveyance belt of embodiment 2)
In the manufacturing method of the conveyor belt 1 according to the second embodiment, the first resin layer 23 is formed by further extruding a thermoplastic elastomer into a sheet having a predetermined size using an extruder in the step of producing the endless long belt. To do.

  Next, the first resin layer 23 is laminated on the conveyance surface side of the core canvas 22, and further, a fluororesin (PTFE) film (non-adhesive layer 21) is laminated on the conveyance surface side of the first resin layer 23, A long belt body 2 having a long end is produced (a long long belt production process). Other processes are the same as those of the manufacturing method of the conveyor belt of the first embodiment.

(Manufacturing method of conveyance belt of embodiment 3)
In the manufacturing method of the conveyance belt 1 according to the third embodiment, an adhesive in which a thermoplastic elastomer is dissolved in an organic solvent is prepared in the step of producing the endless long belt according to the first embodiment, and this adhesive is used as a canvas material (plain weave fabric). The core body canvas 22 and the core body canvas 24 are manufactured by applying the coating material or by immersing the canvas material in an adhesive and cutting it into predetermined dimensions.

  Further, the first elastomer layer 23 and the second resin layer 25 are formed by extruding a thermoplastic elastomer into a sheet having a predetermined size by an extruder.

  Next, the second resin layer 25 is laminated on the conveyance surface side of the core canvas 24, the core canvas 22 is laminated on the conveyance surface side of the second resin layer 25, and the first canvas is disposed on the conveyance surface side of the core canvas 22. The resin layer 23 is laminated, and further, a fluororesin (PTFE) film (non-adhesive layer 21) is laminated on the transport surface side of the first resin layer 23 to produce an end-like long belt body 2 ( Ended long belt manufacturing process). Other processes are the same as those of the manufacturing method of the conveyor belt of the first embodiment.

(Manufacturing method of conveyance belt of embodiment 4)
In the method for manufacturing the conveyor belt 1 according to the fourth embodiment, in the fitting step, both ends (one end 31 and the other end 32) of the belt main body 2 are slightly separated and abutted (for the size of the gap 35). Provide.

  Specifically, the convex portion 31a at one end 31 and the concave portion 32b at the other end 32 of the belt body 2 and the concave portion 31b at one end 31 and the convex portion 32a at the other end 32 are abutted slightly apart from each other (the gap 35). Size), between the tip 31c of the non-adhesive layer 21 of the convex portion 31a of the one end 31 of the belt body 2 and the concave portion 32b fitted to the convex portion 31a, and the convex portion of the other end 32 of the belt main body 2. It fits so that the clearance gap 35 may be respectively formed between the front-end | tip part 32c in the non-adhesion layer 21 of 32a, and the recessed part 31b fitted to the convex part 32a (fitting process).

  The convex portions 31a and 32a and the concave portions 31b and 32b fitted in the fitting step are heat-pressed by a heat press in the thickness direction of the belt main body 2 to exude the adhesive component of the core canvas 22 into the gap 35, and the gap In a state where 35 is buried, the one end 31 and the other end 32 of the belt main body 2 are thermally fused and connected (thermal fusion process). The conveyor belt 1 is obtained through such steps.

  In addition, as another method of providing the gap 35 in the non-adhesive layer 21, in the uneven portion processing step, the tip portions 31c of the non-adhesive layer 21 of the convex portions 31a and 32a at both ends of the belt body 2 are slightly cut ( There is a method of processing so that the gap 35 is formed when the one end 31 and the other end 32 are abutted with each other.

  According to the manufacturing method described above, the gap 35 is provided between the tip portions 31c and 32c of the non-adhesive layer 21 of the convex portions 31a and 32a and the concave portions 31b and 32b fitted to the convex portions 31a and 32a. Next, the adhesive component of the core canvas 22 is oozed out. Thus, the adhesive component of the core canvas 22 that has oozed into the gap 35 covers the side surface of the non-adhesive layer 21, thereby serving as a cushion for the non-adhesive layer 21, and the tips of the protrusions 31 a and 32 a in the non-adhesive layer 21. The stress to the portions 31c and 32c is relieved, the lifting from the bottom of the non-adhesive layer 21 is suppressed, and the tip portions 31c and 32c of the convex portions 31a and 32a are used as starting points from the belt body 2 The conveyance belt 1 which can prevent peeling more can be manufactured.

(Manufacturing method of conveyance belt of embodiment 5)
In the manufacturing method of the conveyor belt 1 according to the fifth embodiment, the first resin layer 23 is formed by further extruding a thermoplastic elastomer into a sheet having a predetermined size using an extruder in the above-described endless long belt manufacturing process. To do.

  Next, the first resin layer 23 is laminated on the conveyance surface side of the core canvas 22, and further, a fluororesin (PTFE) film (non-adhesive layer 21) is laminated on the conveyance surface side of the first resin layer 23, A long belt body 2 having a long end is produced (a long long belt production process). Other steps are the same as those of the method for manufacturing the conveyor belt of the fourth embodiment. However, since the lower layer of the non-adhesive layer 21 is the first resin layer 23, in the heat fusion process, the fitted convex portions 31a and 32a and concave portions 31b and 32b are moved in the thickness direction of the belt body 2 by a heat press. When thermocompression bonding is performed, the resin component of the first resin layer 23 exudes into the gap 35, and the gap body 35 is filled, and the one end 31 and the other end 32 of the belt body 2 are thermally fused and connected (heat Fusion process).

(Manufacturing method of conveyance belt of embodiment 6)
In the manufacturing method of the conveyor belt 1 according to the sixth embodiment, an adhesive in which a thermoplastic elastomer is dissolved in an organic solvent is prepared in the endless long belt manufacturing process, and this adhesive is applied to a canvas material (plain woven fabric), or Then, the canvas material is immersed in an adhesive to perform an adhesion treatment, and cut into predetermined dimensions to produce the core canvas 22 and the core canvas 24.

  Further, the first elastomer layer 23 and the second resin layer 25 are formed by extruding a thermoplastic elastomer into a sheet having a predetermined size by an extruder.

  Next, the second resin layer 25 is laminated on the conveyance surface side of the core canvas 24, the core canvas 22 is laminated on the conveyance surface side of the second resin layer 25, and the first canvas is disposed on the conveyance surface side of the core canvas 22. The resin layer 23 is laminated, and further, a fluororesin (PTFE) film (non-adhesive layer 21) is laminated on the transport surface side of the first resin layer 23 to produce an end-like long belt body 2 ( Ended long belt manufacturing process). Other steps are the same as those in the method for manufacturing the conveyor belt of the fifth embodiment.

(Manufacturing method of conveyance belt of embodiment 7)
In the manufacturing method of the conveyance belt 1 according to the seventh embodiment, an end-like long belt body 2 is manufactured with the same configuration as the conveyance belt 1 according to the third embodiment.

  Then, as shown in FIG. 14, at both ends (one end 31 and the other end 32) of the belt main body 2, a cut is made in the belt longitudinal direction at the center portion of the second resin layer 25 in the belt thickness direction. Thereby, when the cut | notch of the belt thickness direction is made into the outer peripheral side and inner peripheral side of the belt main body 2, the two steps | paragraphs level | step difference formed with an upper layer and a lower layer can be formed. In the belt body 2, the upper side from this cut is the upper layer, and the lower side from the cut is the lower layer.

  Then, after cutting only the upper layer of the one end 31 and the other end 32 of the belt body 2 into a zigzag shape with an X-axis, Y-axis cutting plotter, punching machine, or the like, only the lower layer of the one end 31 and the other end 32 of the belt body 2 Is zigzag-shaped so as to be shifted from the zigzag-shaped position of the upper layer of the one end 31 and the other end 32 of the belt body 2.

  In addition, the front-end | tip part of the convex part 31a of the upper layer of the end 31 of the belt main body 2 and the convex part 32a of the upper layer of the other end 32 (the outer peripheral side of the belt main body 2 including the non-adhesive layer 21) has roundness (arc shape). The tip of the lower convex portion 31c of the one end 31 of the belt main body 2 and the lower convex portion 32c of the other end 32 (the inner peripheral side of the belt main body 2 not including the non-adhesive layer 21) are pointed. Cut into shapes (triangular).

  Thereafter, a plurality of convex portions 31 a on the upper end of the belt body 2 and a plurality of concave portions 32 b on the upper end of the other end 32, and a plurality of concave portions 31 b on the upper end of the one end 31 and a plurality of convex portions on the upper end of the other end 32. Similarly, the plurality of protrusions 31c in the lower layer of the one end 31 of the belt main body 2, the plurality of recesses 32d in the lower layer of the other end 32, and the plurality of recesses 31d in the lower layer of the one end 31 are similarly fitted. And a plurality of protrusions 32c on the lower layer of the other end 32 are brought into contact with each other and fitted together, and heat-pressed in the thickness direction of the belt body 2 with a hot press, so that the one end 31 and the other end 32 of the belt body 2 are fused. (Step difference bonding method).

  Next, the conveyance belts according to Examples 1 to 11 shown in Table 1 and the conventional conveyance belt according to Comparative Example 1 (the convex portions are triangular) are prepared, and a running test is performed on each conveyance belt. The ease of peeling of the non-adhesive layer 21 was observed. Moreover, the analysis by a finite element method analysis (FEM) was performed with respect to each conveyance belt.

(Conveyor belt of Examples 1 to 11)
The conveyor belt 1 used in Example 1 is the conveyor belt of the third embodiment (see FIG. 2). The conveyance belt 1 according to Example 1 includes a non-adhesive layer 21 using a PTFE film having a thickness of 5 mil (about 127 μm), a first resin layer 23 made of a polyether polyurethane elastomer having a thickness of 0.3 mm, and warps -Plain woven fabric using polyester fiber for weft (with adhesive treatment) (Fineness of warp (spun yarn): 20th, Fineness of weft: 1100 dtex, Warp density: 140 / 5cm, Weft density: 56 / 5cm) The core canvas 22, the second resin layer 25 (same as the first resin layer 23), and the core canvas 24 (same as the core canvas 22) are laminated.

  In addition, as shown in FIG. 7, the conveyance belt 1 used in Example 1 has a distance in the width direction of 15 mm between the convex portion 31a (the convex portion 32a) and the convex portion 31a (the convex portion 32a), and the concave portion 31b. And the concave portion 32b are formed in an arc shape in which the distance in the longitudinal direction is 40 mm and the radius R of the tip portion 31c of the convex portions 31a and 32a is 1.5 mm.

  The conveyance belt 1 used in Examples 2 to 4 is the same as the conveyance belt 1 of Example 1 above, in which the radius R of the tip 31c of the convex portions 31a and 32a is 0.5 mm (Example 2), A circular arc shape of 0.0 mm (Example 3) and an arc shape of 2.0 mm (Example 4) are formed.

  The conveyor belt 1 used in Examples 5 to 6 has a PTFE film (Example 5) having a thickness of 1.0 mil (about 25 μm) and a thickness of 20 mil (non-adhesive layer 21 of the conveyor belt 1 of Example 1). (About 508 μm) of PTFE film (Example 6) is used.

  The conveyance belt 1 used in Examples 7 to 8 is the same as the conveyance belt 1 of Example 1 described above, with a gap 35, 1 of 0.5 mm (Example 7) between the tip portion 31c of the convex portion 31a and the concave portion 32b. A gap 35 of 0.0 mm (Example 8) is formed.

  The conveyor belt 1 used in Example 9 is the conveyor belt of the first embodiment (see FIG. 2). The conveyance belt 1 according to Example 9 has a non-adhesive layer 21 using a PTFE film having a thickness of 5 mil (about 127 μm), and a plain woven fabric (adhesive treatment) using polyester fibers for warps and wefts (with warp (spun) And the core canvas 22 having a fineness of 20), a fineness of the weft: 1100 dtex, a warp density: 140 / 5cm, and a weft density: 56 / 5cm).

  The conveyor belt 1 used in Example 10 is the conveyor belt of the second embodiment (see FIG. 2). The conveyance belt 1 according to Example 10 includes a non-adhesive layer 21 using a PTFE film having a thickness of 5 mil (about 127 μm), a first resin layer 23 made of a polyether polyurethane elastomer having a thickness of 0.3 mm, and a warp. -Plain woven fabric using polyester fiber for weft (with adhesive treatment) (Fineness of warp (spun yarn): 20th, Fineness of weft: 1100 dtex, Warp density: 140 / 5cm, Weft density: 56 / 5cm) The core canvas 22 is laminated.

  The conveyor belt 1 used in Example 11 is the conveyor belt of the seventh embodiment (see FIGS. 13 and 14). In the conveyance belt 1 used in Example 11, the one end 31 and the other end 32 of the belt main body 2 are fused by the above-described step bonding method (the fused portion is a bonding portion). Further, as shown in FIG. 15, the conveyance belt 1 used in Example 11 has a width direction distance of 15 mm between the convex portion and the convex portion, and a longitudinal distance between the convex portion and the concave portion of 35 mm. It is. The radius R of the tip of the convex portion on the upper layer of the conveyance belt 1 is formed to be an arc shape of 1.5 mm, and the tip of the convex portion of the lower layer is formed to be triangular. Further, the distance (displacement) in the longitudinal direction between the upper layer convex portion and the lower layer convex portion is 20 mm. The configuration of Example 11 is the same as that of Example 1 except for the step bonding method.

(Conveyor belt of Comparative Example 1)
On the other hand, the conveyance belt used in Comparative Example 1 has a non-adhesive layer 21, a first resin layer 23, a core canvas 22, a second resin layer 25, and a core canvas 24, as in Example 1. It is configured by stacking.

  Further, as shown in FIG. 7, the conveyance belt used in Comparative Example 1 has a triangular shape in which the tips of the convex portions 31 a and 32 a are pointed, and the convex portion 31 a (the convex portion 32 a) and the convex portion 31 a (the convex shape). The distance in the width direction between the portion 32a) is 15 mm, and the distance in the longitudinal direction between the recess 31b and the recess 32b is 60 mm.

(Running test method)
About each conveyance belt, it was made to drive | work using the driving | running | working test machine shown in FIG. 8, and the state of convex part 31a * 32a of each conveyance belt after driving | running | working was observed visually. Specifically, as shown in FIG. 8, a conveyor belt having a width of 100 mm and a length of 1500 mm according to Examples 1 to 11 and Comparative Example 1 is wound around five pulleys having a pulley diameter of φ75 mm (belt). (Tension 8 kgf / cm). This running test was conducted until the conveyor belt was bent 10 million times with five pulleys (the number of times the running test was terminated). And as a judgment standard (acceptance standard), if there was no peeling of the front-end | tip part of a non-adhesion layer in the stage which bent the conveyance belt 2 million times, it judged that it was practical as a conveyance belt.

(Running test results)

  As a result of the running test, in the conveyance belt of Comparative Example 1, the tip of the non-adhesive layer 21 at the convex portion was peeled off at 1.7 million bends. On the other hand, in the conveyance belt 1 of Example 1, no abnormality was observed even with 10 million bends (no peeling). Thus, by making the tip portions 31c and 32c of the convex portions 31a and 32a having a zigzag shape into an arc shape, compared to the case where the tip portion of the convex portion has a sharp shape (triangular shape or the like), The non-adhesive layer 21 is difficult to peel off from the tip portions 31c and 32c of the convex portions 31a and 32a.

  Moreover, three types (Example 2: Radius R = 0.5 mm, Example 3: Radius R = 1.0 mm, Example 4: Radius R) differing from Example 1 (Radius R = 1.5 mm). As for the transport belt with radius R = 2.0 mm, as a result of running test, even if the transport belt is bent 2 million times, there is no peeling of the tip of the non-adhesive layer, and durability that is practical as a transport belt is obtained. It was. In addition, the number of bendings until the tip of the non-adhesive layer peels is Example 2 (radius R = 0.5 mm, 2.5 million times) <Example 3 (radius R = 1.0 mm, 7 million times) <Execution Example 1 (radius R = 1.5 mm, no abnormality up to 10 million times) = In the order of Example 4 (radius R = 2.0 mm, no abnormality up to 10 million times), the larger the radius R, the non-adhesive layer It has been found that peeling of the tip portion of the film becomes difficult.

  Further, two types of conveyance belts (Example 5: PTFE thickness 1.0 mil, Example 6: PTFE thickness 20 mil) having different non-adhesive layer thicknesses compared to Example 1 (PTFE thickness 5 mils) are also used. As a result of the running test, durability performance greatly exceeding the acceptance standard of 2 million times was obtained. However, in Example 5 (1.0 mil), the non-adhesive layer partially disappears (wears) due to friction after bending 9 million times, and in Example 6 (20 mil), cracks (cracks) are generated after bending 7.5 million times. did. Thereby, it turned out that durability of a non-adhesion layer is inferior when the thickness of a non-adhesion layer is thin with respect to Example 1 (5 mil), and bending resistance is inferior when it is thick.

  In addition, as a result of the running test, two types of conveyance belts (Example 7: width 0.5 mm, Example 8: width 1.0 mm) having different gaps 35 as compared with Example 1 were both 10 million times. Completed without bending until bending, durability performance far exceeding the passing standard of 2 million times was obtained.

  Further, in the conveyance belt 1 of Example 9 and Example 10 as well as Example 1, it greatly exceeded the acceptance standard of “2 million times of bending” and completed without abnormality until “10 million times of bending”. Sufficient durability was confirmed.

  Further, as a result of the running test, the durability performance equivalent to that of Example 1 was confirmed for the conveyor belt 1 of Example 11.

(Running test with foreign objects caught)
Next, Example 11 (with a step at the joint) and Example 1 (with a step at the joint) under the following travel conditions assuming the travel of the transport belt with foreign matter sandwiched between the transport belt and the pulley. No difference in level).

  In the running test in the case where a foreign object was sandwiched, a running test machine (5-axis running test machine) shown in FIG. 16 was used to run the conveyor belt, and the belt running time until the joint was broken was measured. Specifically, in order to reproduce a state in which foreign matter is sandwiched between the inner peripheral side of the conveyor belt and the pulley on two pulleys with a diameter of 75 mm of the running test machine, The pressure-sensitive adhesive tape was wound to a thickness of 1.5 mm to provide convex portions (foreign matter). Further, a 24-hour running test was conducted under the conditions of a belt tension of 1 N / mm and a belt speed of 100 m / min. And as an evaluation method, the belt running time until a junction part cracks was measured. The running test results are shown in Table 2.

  As a result of the running test in the case where the foreign matter is sandwiched, Example 11 in which a step is provided in the joint portion on the outer peripheral side and the inner peripheral side of the joint portion of the conveyor belt 1 is compared with Example 1 in which no step is provided. It was confirmed that even when foreign matter was caught between the inner peripheral side of the conveyor belt and the pulley, the joint was hardly cracked (stress concentration was reduced by the step).

(Finite Element Analysis (FEM))
Regarding the conveyance belt according to Example 1 and Comparative Example 1, the stress concentration at the tip of the convex portion was analyzed by finite element method analysis (FEM), and the effect of the present invention was verified.

  Specifically, with respect to the conveyance belts according to Example 1 and Comparative Example 1, as shown in FIG. 9, a linear tensile force and a tension applied to the conveyance belt become 8 N / mm, and The stress concentration at the tip of the convex when the forward bending force was applied was analyzed. The pulley diameter used for forward bending is 75 mm.

  The analysis result is shown in FIG. This analysis result shows the stress distribution on the back side (the interface with the first resin layer 23) of the tip of the convex portion of the non-adhesive layer 21, and indicates that the stress is higher the higher the bar on the left side of the figure. Further, the numerical value of the stress in the figure is the maximum stress value applied to the conveyor belt (Mises stress).

  Although stress concentrates on the tip of the convex portion of the non-adhesive layer 21 of Comparative Example 1, the stress on the tip of the convex portion of the non-adhesive layer 21 of Example 1 is less concentrated than that of Comparative Example 1. . Accordingly, it can be seen that when the conveyance belt is pulled and forward bent, the stress applied to the tip is suppressed when the tip of the convex portion has an arc shape. This is presumably because the area of the non-adhesive layer 21 is extremely smaller at the front end of the convex portion of Comparative Example 1 than at the periphery, so that stress tends to concentrate on the front end. On the other hand, it is considered that the area of the non-adhesive layer 21 at the tip is increased and the stress concentration on the tip can be suppressed by making the tip of the convex portion into an arc shape as in the first embodiment.

  Next, in the case where the gap 35 is formed in the conveyance belt 1 used in Example 1, the influence of the resin component that penetrates from the gap 35 is analyzed by a finite element method analysis (FEM), and the effect of the present invention is verified. . The resin component (the amount of bleeding) that has oozed out from the lower layer (first resin layer 23) into the gap 35 is changed by changing the width A between the tip 31c and the recess 32b of the protrusion 31a shown in FIG. 3 (width A: 0 mm). (No gap), 0.5 mm, 1.0 mm), analysis was performed.

  The analysis results are shown in FIG. According to this analysis result, the greater the amount of the resin component that has oozed into the gap 35 (the larger the gap 35), the more the stress concentration on the tip of the convex portion can be suppressed, and the cushioning property of the oozed resin component can be reduced. It can be seen that the tip of the convex portion of the non-adhesive layer 21 is prevented from floating from the lower layer (first resin layer 23).

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment and an Example. The scope of the present invention is indicated not only by the above description of the embodiments and examples but also by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

DESCRIPTION OF SYMBOLS 1 Conveying belt 2 Belt main body 21 Non-adhesive layer 22 Core canvas 23 First resin layer 24 Core canvas 25 Second resin layer 31 One end 31a Convex part 31b Concave part 31c Tip part 32 Other end 32a Convex part 32b Concave part 32c Tip part 35 Gap

Claims (17)

An endless transport belt in which one end and the other end in the longitudinal direction of the belt main body laminated with a non-adhesive layer serving as a transport surface are connected,
The one end and the other end of the belt main body on which the non-adhesive layer is laminated respectively have a convex portion and a concave portion provided alternately along the width direction intersecting the longitudinal direction, The concave portion at the other end, and the concave portion at the one end and the convex portion at the other end are connected to each other,
The conveyance belt according to claim 1, wherein a tip portion of the convex portion has an arc shape when the conveyance surface is viewed from a direction orthogonal to the conveyance surface.   The conveyor belt according to claim 1, wherein a tip end portion of the convex portion of the belt main body on which the non-adhesive layer is laminated has a perfect circle shape with a radius of 0.5 to 2.0 mm.   The conveyance belt according to claim 1, wherein the non-adhesive layer is formed of a resin.   The conveyor belt according to claim 3, wherein the non-adhesive layer is made of a fluororesin.   The conveyor belt according to claim 4, wherein the non-adhesive layer is a film-like fluororesin layer.   The transport belt according to claim 1, wherein the non-adhesive layer has a thickness of 1.0 to 20 mil. The belt body is
The non-adhesive layer;
A first core canvas layer laminated on the lower layer of the non-adhesive layer;
The transport belt according to claim 1, wherein the transport belt is laminated. The belt body is
The non-adhesive layer;
A first resin layer laminated under the non-adhesive layer;
A first core canvas layer disposed in a lower layer of the first resin layer;
The transport belt according to claim 1, wherein the transport belt is laminated. The belt body further includes:
A second resin layer laminated on the lower layer of the first core canvas layer;
A second core canvas layer disposed below the second resin layer;
The conveyor belt according to claim 8, wherein the belts are laminated. A gap is formed between the tip of the non-adhesive layer of the convex portion and the concave portion fitted into the convex portion, respectively.
The transport belt according to claim 7, wherein the first core canvas layer includes an adhesive, and the adhesive oozes into the gap. A gap is formed between the tip of the non-adhesive layer of the convex portion and the concave portion fitted into the convex portion, respectively.
The conveying belt according to claim 8 or 9, wherein the first resin layer is oozed into the gap.   The conveyance belt according to claim 10 or 11, wherein a width of the gap in the longitudinal direction is 0.1 to 1.0 mm.   The conveyance belt according to claim 9, wherein the first resin layer and the second resin layer are a thermoplastic resin or a thermoplastic elastomer.   The transport belt according to claim 10, wherein the adhesive included in the first core canvas layer is a thermoplastic resin or a thermoplastic elastomer.   The transport belt according to claim 13 or 14, wherein the thermoplastic resin or the thermoplastic elastomer is a polyether-based polyurethane or a polycarbonate-based polyurethane. One end and the other end in the longitudinal direction of the belt main body in which the non-adhesive layer serving as the conveyance surface and the first core canvas or the first resin layer subjected to the adhesion treatment are laminated, and the convex portion having a concave portion and a tip portion having an arc shape. And a concavo-convex part processing step for processing so as to be alternately arranged along the width direction intersecting the longitudinal direction,
A fitting step in which the convex portion at the one end and the concave portion at the other end, and the concave portion at the one end and the convex portion at the other end are brought into contact with each other;
A heat fusion process in which the convex part and the concave part fitted in the fitting process are heat-pressed in a thickness direction of the belt main body by a heat press, and one end and the other end of the belt main body are thermally fused and connected. When,
The manufacturing method of the conveyance belt characterized by including. One end and the other end in the longitudinal direction of the belt main body in which the non-adhesive layer serving as the conveyance surface and the first core canvas or the first resin layer subjected to the adhesion treatment are laminated, and the convex portion having a concave portion and a tip portion having an arc shape. Are arranged alternately along the width direction intersecting the longitudinal direction, and between the tip portion of the non-adhesive layer of the convex portion and the concave portion fitted to the convex portion. An uneven portion processing step for processing so as to form a gap,
The convex portion at the one end and the concave portion at the other end, and the concave portion at the one end and the convex portion at the other end are brought into contact with each other, and fitted to the leading end portion of the non-adhesive layer of the convex portion and the convex portion. A fitting step of fitting so that there is a gap between each of the recesses;
The convex portion and the concave portion fitted in the fitting step are heat-pressed by heat press in the belt body thickness direction, and the adhesive component of the first core canvas or the first resin layer is inserted into the gap. A heat fusion step of leaching the resin component and filling the gap with one end and the other end of the belt body being thermally fused and connected;
The manufacturing method of the conveyance belt characterized by including.