JP6804847B2 - Conveyance belt and its manufacturing method - Google Patents

Description

The present invention relates to a transport belt used for transporting food and a method for producing the same.

In a transport belt that transports hot and highly sticky foods such as freshly cooked rice and freshly cooked rice cakes, the heat resistance of the transport surface is improved, and in particular, the transported object adheres to the transport surface and is transported. It is necessary to prevent it from becoming difficult to separate from the surface. As a transport belt having improved non-adhesiveness (easiness of separating the transported object from the transport surface) of the transport surface, a transport belt in which the transport surface is covered with a resin layer (fluororesin) having excellent non-adhesiveness is known. (Prior Document 1).

Further, in general, the transport belt is used in an endless shape by joining both ends thereof. At this time, as a method of joining both ends, a method of overlapping and joining the ends of both ends and a method of cutting both ends into a zigzag shape (lightning shape, finger shape) and butt-joining them are known. (See FIG. 12). In the superposition method, the joint portion becomes thick and the rigidity increases, so that the flexibility of the transport belt decreases. On the other hand, the butt method is preferably used because the transfer belts do not become thick because the joints do not overlap and the flexibility is good (Prior Document 2).

Japanese Patent No. 2542770 JP-A-2009-197896

However, in a transport belt in which the transport surface is coated with a non-adhesive resin layer (non-adhesive layer), since the resin layer constituting the transport surface is a non-adhesive material, it is different from the lower layer than a general-purpose material. Poor adhesiveness. Therefore, if the joining method of both ends of the transport belt is a butt method, the transport belt is wound around the pulley and becomes large, especially in a layout in which the transport belt is greatly bent, such as a transport device equipped with a small diameter pulley or a knife edge. The non-adhesive layer is easily peeled off at the zigzag-shaped tip when bent.

Therefore, the present invention provides an endless transport belt in which the non-adhesive layer does not peel off at the joint portion (zigza-shaped tip portion) joined by the butt method even when the highly adhesive transported object is transported. The purpose is to do.

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

According to the above configuration, the tip of the convex portion to be fitted when connecting one end and the other end of the belt body on which the non-adhesive layer is laminated has an arc shape, so that the tip portion of the convex portion is formed. The contact area of the non-adhesive layer with respect to the belt body at the tip is increased as compared with the pointed shape (for example, triangular shape). As a result, even if the tip of the convex portion bends when the conveyor belt is used, 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, one of the present inventions is that in the transport belt, the tip of the convex portion of the belt body on which the non-adhesive layer is laminated has a perfect circular 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 circular shape with a radius of 0.5 to 2.0 mm, the stress on the tip of the convex portion is not concentrated and is evenly distributed. It is possible to further prevent the non-adhesive layer from peeling off from the belt body, starting from the tip of the portion.

Further, one of the present inventions is characterized in that, in the transport belt, the non-adhesive layer is formed of a resin.

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

Further, one of the present inventions is characterized in that, in the transport belt, the non-adhesive layer is formed of a fluororesin.

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

Further, one of the present inventions 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, so that the non-adhesive layer is easily peeled off from the belt body due to bending of the transport belt.
Therefore, as described above, the thickness of the non-adhesive layer can be reduced by forming the non-adhesive layer into a film-like fluororesin layer. As a result, the non-adhesive layer can be made thin, so that it is possible to prevent the non-adhesive layer from peeling off from the belt body due to bending of the transport belt.

Further, one of the present inventions is characterized in that the thickness of the non-adhesive layer in the transport belt is 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, by setting the thickness of the non-adhesive layer in the range of 1.0 to 20 mil as described above, the durability and flexibility of the non-adhesive layer can be maintained.

Further, one of the present inventions is that in the transport belt, the belt body is
With the non-adhesive layer
It is characterized in that a first core canvas layer laminated on a lower layer of the non-adhesive layer is laminated.

According to the above configuration, the belt body can be composed of the non-adhesive layer and the first core canvas layer, the thickness of the transport belt is reduced, and the flexibility is excellent.

Further, one of the present inventions is that in the transport belt, the belt body is
With the non-adhesive layer
The first resin layer laminated on the lower layer of the non-adhesive layer and
It is characterized in that the first core canvas layer arranged under the first resin layer is laminated.

According to the above configuration, by providing the first resin layer between the non-adhesive layer of the belt body and the first core canvas layer, the transport surface becomes soft and damage to the transported object can be prevented.

Further, one of the present inventions is that in the transport belt, the belt body is further
A second resin layer laminated on the lower layer of the first core canvas layer,
It is characterized in that a second core canvas layer arranged under the second resin layer is laminated.

According to the above configuration, the belt main body is further provided with the second resin layer and the second core canvas layer, so that the belt strength of the transport belt can be increased.

Further, in one of the present inventions, in the transport belt, a gap is formed between the tip portion of the non-adhesive layer of the convex portion and the concave portion fitted to the convex portion.
The first core canvas layer contains an adhesive, and the adhesive is exuded into the gap.

According to the above configuration, a gap is provided between the tip of the non-adhesive layer of the convex portion and the concave portion that fits into the convex portion, and the gap is used to bond the first core canvas layer and the non-adhesive layer. Exude the adhesive used. As a result, the adhesive exuded into the gap covers the side surface of the non-adhesive layer, and this adhesive acts as a cushion for the non-adhesive layer to relieve stress on the tip of the convex portion in the non-adhesive layer. It is possible to suppress the lifting of the non-adhesive layer from below and further prevent the non-adhesive layer from peeling off from the belt body starting from the tip of the convex portion.

Further, in one of the present inventions, in the transport belt, a gap is formed between the tip portion of the non-adhesive layer of the convex portion and the concave portion fitted to the convex portion.
The first resin layer is characterized in that it exudes into the gap.

According to the above configuration, a gap is provided between the tip end portion of the non-adhesive layer of the convex portion and the concave portion fitted to the convex portion, and the resin component of the first resin layer is exuded into this gap. As a result, the resin component of the first resin layer exuded into the gap covers the side surface of the non-adhesive layer, so that the first resin layer acts 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 the bottom of 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.

Further, one of the present inventions is characterized in that, in the transport belt, the width of the gap in the longitudinal direction is 0.1 to 1.0 mm.

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

Further, one of the present inventions 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 above configuration, the first resin layer and the second resin layer can be configured to have excellent workability and strength.

Further, one of the present inventions 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 above configuration, the first core canvas can be configured to have excellent workability and strength.

Further, one of the present inventions is characterized in that, in the transport belt, the thermoplastic resin or the thermoplastic elastomer is a polyether polyurethane or a polycarbonate polyurethane.

According to the above configuration, the cost performance is excellent.

Further, in one of the present inventions, one end and the other end in the longitudinal direction of the belt body in which the non-adhesive layer serving as the transport surface and the first core canvas or the first resin layer which have been bonded are laminated are formed as recesses. An uneven portion processing step of processing so that convex portions having an arc-shaped tip are alternately arranged along the width direction intersecting the longitudinal direction.
A fitting step in which the convex portion at one end and the concave portion at the other end, and the concave portion at one end and the convex portion at the other end are abutted against each other and fitted to each other.
A heat fusion step in which the convex portion and the concave portion fitted in the fitting step are heat-bonded by a hot press in the thickness direction of the belt body, and one end and the other end of the belt body are heat-sealed and connected. It is a method of manufacturing a transport belt, which comprises.

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 body on which the non-adhesive layer is laminated has an arc shape, so that the tip portion of the convex portion is formed. The contact area of the non-adhesive layer with respect to the belt main body at the tip is increased as compared with the one having a sharp shape (for example, a triangular shape). As a result, even if the tip of the convex portion bends when the conveyor belt is used, 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 transport belt that can prevent the above.

Further, in one of the present inventions, one end and the other end in the longitudinal direction of the belt body in which the non-adhesive layer serving as the transport surface and the first core canvas or the first resin layer which have been bonded are laminated are formed as recesses. The tip portion is processed so that the convex portion having an arc shape is alternately arranged along the width direction intersecting the longitudinal direction, and the tip portion and the convex portion of the non-adhesive layer of the convex portion are formed. The uneven portion processing step of processing so that a gap is formed between the recesses to be fitted, and
The convex portion at one end and the concave portion at the other end, and the concave portion at one end and the convex portion at the other end are abutted against each other, and the convex portion is fitted into the tip portion of the non-adhesive layer and the convex portion. The fitting process of fitting so that a gap is formed between the recesses and the recesses.
The convex portion and the concave portion fitted in the fitting step are heat-pressed by a hot press in the thickness direction of the belt body, and the adhesive component of the first core canvas or the first resin layer is formed in the gap. A method for manufacturing a transport belt, which comprises a heat-sealing step of heat-sealing and connecting one end and the other end of the belt body in a state where the resin component is exuded and the gap is filled. is there.

It is possible to provide an endless transport belt in which the non-adhesive layer does not peel off at the joint portion (the tip portion having a zigzag shape) joined by the butt method even when the transported object having high adhesiveness is conveyed.

It is a schematic explanatory view of the transport belt which concerns on Embodiments 1-3. It is sectional drawing in the peripheral length direction of the transport belt which concerns on Embodiments 1-3. It is a schematic explanatory drawing of the conveyor belt which concerns on Embodiments 4-6. It is sectional drawing in the peripheral direction of the transport belt which concerns on Embodiments 4-6. It is explanatory drawing of the manufacturing method of the transport belt which concerns on Embodiments 1-3. It is explanatory drawing of the manufacturing method of the transport belt which concerns on Embodiments 4-6. It is explanatory drawing of the transport belt which concerns on Example 1 and Comparative Example 1. It is explanatory drawing of the traveling test machine used for the traveling test. It is explanatory drawing of the analysis method of the finite element method analysis (FEM). It is an analysis result of the finite element method analysis (FEM). It is an analysis result of the finite element method analysis (FEM). It is the schematic of the conventional conveyor belt. It is a schematic explanatory view of the transport belt which concerns on Embodiment 7. It is explanatory drawing of the manufacturing method of the transport belt which concerns on Embodiment 7. It is explanatory drawing of the transport belt which concerns on Example 11. It is explanatory drawing of the traveling test machine used for the traveling test when a foreign substance is sandwiched.

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

(Outline of transport belt 1)
The transport belt 1 according to the present embodiment is a flat belt formed into an endless shape by joining both ends of a long strip-shaped belt body, and as shown in FIG. 1, the drive pulley 11 and the driven pulley 12 It is used by being wrapped in between. As a result, the transported object (article) such as food can be placed on the transport surface of the transport belt 1 and transported from the driven pulley 12 side to the drive pulley 11 side.

(Embodiment 1)
FIG. 1 shows a side view and a top view of the transport belt 1 according to the first to third embodiments. FIG. 2 shows a sectional view taken along line XX of the transport belt 1 according to the first to third embodiments in the circumferential length direction. In the cross-sectional view of the transport belt 1 shown in FIG. 2, the upper side of the drawing is the outer peripheral side (conveyor surface side) on which the transported object is placed, and the lower side is the inner peripheral side (the 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 transport belt 1.

As shown in FIGS. 1 and 2, in the transport belt 1 of the first embodiment, one end 31 and the other end 32 in the longitudinal direction of the belt body 2 on which the non-adhesive layer 21 serving as the transport surface is laminated are connected. One end 31 and the other end 32 of the belt body 2 have convex portions 31a / 32a and concave portions 31b / 32b alternately provided along the width direction intersecting the longitudinal direction, respectively, and the convex portions 31a of the one end 31 The concave portion 32b of the other end 32 and 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 crimping by heating and pressurizing.

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

Since the non-adhesive layer 21 is a transport surface that comes into direct contact with the transport surface, when the transport surface is a hot and highly sticky food such as freshly cooked rice or freshly cooked rice cake, the heat resistance of the transport surface is high. A material having excellent non-adhesiveness is used, which enhances the property and makes it difficult for the conveyed material to adhere to the conveyed surface. For example, a resin such as a fluororesin or a silicone resin can be used for the non-adhesive layer 21, but a fluororesin having excellent non-adhesiveness is preferable. Examples of the fluororesin include PTFE (polytetrafluoroethylene), PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer), PCTFE (polychlorotrifluoroethylene), etc., but in addition to being particularly non-adhesive, heat resistance PTFE is preferable because it is also excellent in 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. Generally, 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 transport belt 1. Therefore, as described above, the thickness of the non-adhesive layer 21 can be reduced by forming the non-adhesive layer 21 into a film-like fluororesin layer. As a result, the non-adhesive layer 21 can be made thin, so that it is possible to prevent the non-adhesive layer 21 from peeling off from the belt body 2 due to bending of the transport 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.

The thickness of the non-adhesive layer 21 is preferably formed in the range of 1.0 to 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, by setting the thickness of the non-adhesive layer 21 in the range of 1.0 to 20 mil as described above, the durability and flexibility of the non-adhesive layer 21 can be maintained.

The core canvas 22 (first core canvas layer) is a woven fabric (plain weave, twill weave, satin weave, etc.) woven by crossing warp threads and weft threads. For example, a plain weave cloth woven by crossing warp threads and weft threads at substantially right angles can be used. As the material of the warp and weft, polyester fiber, polyamide fiber, cotton fiber and the like are used. Further, as the warp and weft, a multifilament in which filaments (long fibers) are twisted, a monofilament, or a spun yarn (spun yarn) in which short fibers are twisted may be used. The fineness of the warp and weft is 500 to 1500 dtex in the case of filament yarn (5 to 22 count in the case of spun yarn). The warp density is 70 to 150 threads / 5 cm, and the weft density is 45 to 80 threads / 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 required for transporting the article 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 adhesive treatment in order to improve the adhesiveness with the non-adhesive layer 21. The adhesive treatment is performed by coating the core canvas 22 with an adhesive dissolved in an organic solvent, or by immersing the core canvas 22 in the adhesive. As the adhesive, a thermoplastic resin or thermoplastic elastomer having excellent processability and strength is preferable, and as the thermoplastic resin or thermoplastic elastomer, polyether polyurethane or polycarbonate polyurethane is preferable, and especially 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 body 2: joint)
As shown in FIG. 2, the convex portion 31a and the concave portion 31b formed at one end 31 of the belt main body 2 have a zigzag shape (lightning shape, finger shape). Further, the convex portion 32a and the concave portion 32b formed on the other end 32 of the belt main body 2 also have a zigzag shape. The convex portion 31a and the concave portion 31b, and the convex portion 32a and the concave portion 32b have a zigzag shape so as to fit each other by cutting both ends of the belt body 2 in the longitudinal direction with an X or Y-axis cutting plotter, a punching machine, or the like. It is formed so as to have a (lightning shape).

Further, as shown in FIG. 1, the tip portions 31c of the convex portions 31a and 32a have an arcuate shape when the transport surface is viewed from an orthogonal direction. In the present embodiment, it is preferable that the tip portions 31c of the convex portions 31a and 32a have a perfect circular shape and have a roundness with a radius R in the range of 0.5 to 2.0 mm.

Further, the zigzag-shaped convex portion 31a of one end 31 and the concave portion 32b of the other end 32, and the concave portion 31b of one end 31 and the convex portion 32a of the other end 32 are fitted against each other to fit the belt. One end 31 and the other end 32 of the belt main body 2 are connected by heat-pressing with a hot press in the thickness direction of the main body 2.

According to the above configuration, the tip portions 31c and 32c of the convex portions 31a and 32a to be fitted when connecting 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 body 2 at the tip portions 31c / 32c is increased as compared with the case where the tip portions of the convex portions 31a / 32a have a sharp shape (for example, a triangular shape). As a result, even if the tip portions 31c / 32c of the convex portions 31a / 32a are bent when the conveyor belt 1 is used, stress concentration of the convex portions 31a / 32a on the tip portions 31c / 32c can be suppressed, and the convex portions 31a / 32a can be suppressed. It is possible to prevent the non-adhesive layer 21 from peeling off from the belt body 2 starting from the tip portions 31c and 32c.

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

Further, according to the above configuration, the belt body 2 can be composed of the non-adhesive layer 21 and the core canvas 22 layer, and the conveyor belt 1 having a thin thickness and excellent flexibility can be obtained.

(Embodiment 2)
In the transport belt 1 of the second embodiment, as shown in FIG. 2, the belt main body 2 has the non-adhesive layer 21 and the first resin layer 23 in this order from the outer peripheral side (conveyor surface side) to the inner peripheral side of the transport belt 1. And the core canvas 22 (first core canvas layer) are laminated. The other configurations are the same as those in the first embodiment.

The first resin layer 23 is formed of a thermoplastic resin or a thermoplastic elastomer made of polyurethane, polyolefin such as polyethylene / polypropylene, and polyester. In particular, a thermoplastic polyurethane resin / elastomer having excellent processability and strength, a polyether polyurethane having excellent hydrolysis resistance, and a polycarbonate polyurethane having excellent heat resistance and chemical resistance are preferable. The first resin layer 23 laminated under the non-adhesive layer 21 is provided to soften the transport surface of the non-adhesive layer 21 and prevent damage to the transported object. If the material used for the non-adhesive layer 21 (for example, fluororesin) is expensive, increasing the thickness of the non-adhesive layer 21 in order to improve the cushioning property of the transport surface increases the cost. Therefore, 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, the manufacturing cost can be reduced.

The thickness of the first resin layer 23 is preferably in the range of 0.3 to 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 ensured, and if it is thicker than 0.5 mm, the flexibility is lowered.

(Embodiment 3)
In the transport belt 1 of the third embodiment, as shown in FIG. 2, the belt main body 2 has the non-adhesive layer 21 and the first resin layer 23 in this order from the outer peripheral side (conveyor surface side) to the inner peripheral side of the transport 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. The other configurations are the same as those in the second embodiment.

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

Like the core canvas 22, the core canvas 24 is a woven fabric (plain weave, twill weave, satin weave, etc.) woven by crossing warp threads and weft threads.

As described above, the belt main body 2 is provided with the second resin layer 25 and the core canvas 24 in addition to the first resin layer 23 and the core canvas 22, so that the belt strength of the transport belt 1 can be enhanced. it can.

(Embodiment 4)
In the transport belt 1 of the fourth embodiment, as shown in FIG. 4, the belt main body 2 has the non-adhesive layer 21 and the core canvas 22 (in order from the outer peripheral side (conveyor surface side) to the inner peripheral side of the transport belt 1). The first core canvas layer) is laminated (similar to the first embodiment). Then, as shown in FIGS. 3 and 4, the tip portion 31c of the non-adhesive layer 21 of the convex portion 31a of one end 31 of the belt main body 2 and the concave portion 32b fitted to the convex portion 31a, and the belt main body 2 A gap 35 is formed between the tip end portion 32c of the non-adhesive layer 21 of the convex portion 32a of the other end 32 and the concave portion 31b that fits into the convex portion 32a. The adhesive contained in the core canvas 22 laminated on the lower layer of the non-adhesive layer 21 is exuded into the gap 35 to fill the gap 35.

The gap 35 is provided in this way, the adhesive contained in the core canvas 22 is exuded into the gap 35, and the adhesive covers the side surface of the non-adhesive layer 21, so that the adhesive is a non-adhesive layer. It plays the role of a cushion for the non-adhesive layer 21, relaxes the stress on the tips 31c and 32c of the convex portions 31a and 32a in the non-adhesive layer 21, suppresses the lifting from below the non-adhesive layer 21, and suppresses the lifting of the convex portions 31a and 32a. It is possible to further prevent the non-adhesive layer 21 from peeling 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 portion 31c and the concave portion 32b of the convex portion 31a is within the range of 0.1 to 1.0 mm. Is preferable. By setting the width A in the range of 0.1 to 1.0 mm, the amount of bleeding of the adhesive exuding from the gap 35 can be set to an appropriate amount to bear the cushioning property for the non-adhesive layer.

As a method of providing the gap 35 in the non-adhesive layer 21, there is a method of providing the gap 35 by abutting the two ends (one end 31 and the other end 32) of the belt body 2 slightly apart from each other. In addition, as a method of providing the gap 35 in the non-adhesive layer 21, the tip portion 31c of the non-adhesive layer 21 of the convex portions 31a and 32a at both ends of the belt body 2 is slightly cut (the size of the gap 35 is reduced). (Cut), there is a method of allowing a gap 35 to be formed when one end 31 and the other end 32 are butted against each other.

(Embodiment 5)
In the transport belt 1 of the fifth embodiment, as shown in FIG. 4, the belt body 2 has the non-adhesive layer 21 and the first resin layer 23 in this order from the outer peripheral side (conveyor surface side) to the inner peripheral side of the transport belt 1. And the core canvas 22 (first core canvas layer) are laminated. The other configurations are the same as those in the fourth embodiment.

The first resin layer 23 is formed of a thermoplastic resin or a thermoplastic elastomer made of polyurethane, polyolefin such as polyethylene / polypropylene, polyester, as in the second embodiment. In particular, a thermoplastic polyurethane resin / elastomer having excellent processability and strength, a polyether polyurethane having excellent hydrolysis resistance, and a polycarbonate polyurethane having excellent heat resistance and chemical resistance are preferable. The first resin layer 23 laminated under the non-adhesive layer 21 is provided to soften the transport surface of the non-adhesive layer 21 and prevent damage to the transported object. The thickness of the first resin layer 23 is preferably in the range of 0.3 to 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 ensured, and if it is thicker than 0.5 mm, the flexibility is lowered.

Then, as shown in FIGS. 3 and 4, the tip portion 31c of the non-adhesive layer 21 of the convex portion 31a of one end 31 of the belt main body 2 and the concave portion 32b fitted to the convex portion 31a, and the belt main body 2 A gap 35 is formed between the tip end portion 32c of the non-adhesive layer 21 of the convex portion 32a of the other end 32 and the concave portion 31b that fits into the convex portion 32a. The gap 35 is filled with the resin component of the first resin layer 23 laminated on the lower layer of the non-adhesive layer 21 by exuding.

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

The gap 35 is provided in this way, the resin component of the first resin layer 23 is exuded into the gap 35, and the resin component covers the side surface of the non-adhesive layer 21, so that the resin component cushions the non-adhesive layer 21. The stress on the tips 31c and 32c of the convex portions 31a and 32a in the non-adhesive layer 21 is relieved, the lifting from below of the non-adhesive layer 21 is suppressed, and the tips 31c of the convex portions 31a and 32a are suppressed. -It is possible to further prevent the non-adhesive layer 21 from peeling off from the belt body 2 starting from 32c.

(Embodiment 6)
In the transport belt 1 of the sixth embodiment, as shown in FIG. 4, the belt main body 2 has the non-adhesive layer 21 and the first resin layer 23 in this order from the outer peripheral side (conveyor surface side) to the inner peripheral side of the transport 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. The other configurations are the same as those in the fifth embodiment.

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

Like the core canvas 22, the core canvas 24 is a woven fabric (plain weave, twill weave, satin weave, etc.) woven by crossing warp threads and weft threads.

As described above, the belt main body 2 is provided with the second resin layer 25 and the core canvas 24 in addition to the first resin layer 23 and the core canvas 22, so that the belt strength of the transport belt 1 can be enhanced. it can.

(Embodiment 7)
As shown in FIG. 13, the transport belt 1 of the seventh embodiment has the non-adhesive layer 21 and the belt main body 2 in this order from the outer peripheral side (conveyor surface side) to the inner peripheral side of the transport belt 1 as in the third embodiment. , 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. ..

Then, in the transport belt 1 of the seventh embodiment, as shown in FIGS. 13 and 14, a two-step step with a lower layer protruding is formed at one end 31 of the belt main body 2, and further, the formed two-step step is formed. A plurality of convex portions 31a / 31c and a plurality of concave portions 31b / 31d having a zigzag shape (lightning shape, finger shape) are formed in each of them, and the other end 32 of the belt body 2 has two steps in which an upper layer protrudes. In addition, a plurality of convex portions 32a / 32c and a plurality of concave portions 32b / 32d having a zigzag shape (lightning shape, finger shape) are formed in each of the two steps formed. Then, the plurality of convex portions 31a on the upper layer of one end 31 of the belt body 2 and the plurality of concave portions 32b on the upper layer of the other end 32, and the plurality of concave portions 31b on the upper layer of the one end 31 and the plurality of convex portions on the upper layer of the other end 32. The 32a are abutted against each other and fitted to each other, and similarly, a plurality of convex portions 31c in the lower layer of one end 31 of the belt body 2, a plurality of recesses 32d in the lower layer of the other end 32, and a plurality of recesses 31d in the lower layer of the one end 31. And the plurality of convex portions 32c of the lower layer of the other end 32 are butted against each other and fitted to each other, and heat-pressed by a hot press in the thickness direction of the belt body 2 to fuse the one end 31 and the other end 32 of the belt body 2. It is joined by doing (step joining method).

The upper layer and the lower layer of 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 body 2 are also divided into two stages at the central portion of the second resin layer 25.

Further, the tip portions of the convex portion 31a on the upper layer of one end 31 of the belt body 2 and the convex portion 32a on the upper layer of the other end 32 have an arc shape when the transport surface is viewed from an orthogonal direction. The concave portion 32b at the other end 32 and the concave portion 31b at one end 31 also have an arc shape corresponding to the convex portion 31a and the convex portion 32a having an arc shape. On the other hand, the tip portions of the convex portion 31c of the lower layer of the one end 31 of the belt body 2 and the convex portion 32c of the lower layer of the other end 32 have a triangular shape. The concave portion 32d at the other end 32 and the concave portion 31d at one end 31 also have a triangular shape corresponding to the triangular convex portion 31c and the convex portion 32c.

In the seventh embodiment, the tip portions of the convex portion 31c of the lower layer of the one end 31 of the belt body 2 and the convex portion 32c of the lower layer of 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 one end 31 are also formed into an arc shape corresponding to the convex portion 31c and the convex portion 32c having the arc shape.

In a joint type conveyor belt that does not have a step as described above in the longitudinal direction of the belt, if foreign matter adheres to the inner peripheral surface of the conveyor belt and is run as it is, the foreign matter is caught between the conveyor belt and the pulley. Local stress may be applied to the joint between one end and the other end of the transport belt, causing the connection to crack. Therefore, by providing a step at the joint between one end and the other end of the transport belt (step joint method), local stress concentration on the joint is relaxed and the joint is less likely to crack than when there is no step. can do.

(Manufacturing method of transport belt of Embodiment 1)
A method of manufacturing the transport belt 1 according to the first embodiment will be described with reference to FIG.

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 (plain woven cloth), or the canvas material is immersed in an adhesive to perform an adhesive treatment to obtain a predetermined size. The core canvas 22 is manufactured by cutting into a core canvas 22.

Then, a fluororesin (PTFE) film (non-adhesive layer 21) is laminated on the transport surface side of the core canvas 22 to produce an endless long belt body 2 (ended long belt manufacturing step). ..

Next, one end 31 and the other end 32 in the longitudinal direction of the belt body 2 in which the non-adhesive layer 21 and the core canvas 22 are laminated are cut with an X or Y axis cutting plotter, a punching machine, or the like to form a zigzag shape. Process so that it has a (lightning shape) (concavo-convex part processing process). As a result, one end 31 of the belt body 2 is processed into a shape in which the convex portions 31a and the concave portions 31b having a zigzag shape are alternately arranged along the width direction. Further, the other end 32 of the belt body 2 is also processed into a shape in which the convex portions 32a and the concave portions 32b having a zigzag shape are alternately arranged along the width direction.

Further, in the uneven portion processing step, when one end 31 and the other end 32 of the belt body 2 are cut by an X or Y-axis cutting plotter, a punching machine, or the like, the tip portions 31c of the convex portions 31a and 32a are subjected to the conveying surface. Is processed so that the shape when viewed from the orthogonal direction is an arc shape. Further, the recesses 31b and 32b are also processed into an arc shape corresponding to the arcuate tip portion 31c.

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

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

According to the above manufacturing method, the tip portions 31c and 32c of the convex portions 31a and 32a to be fitted when connecting 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 of the non-adhesive layer 21 with the belt body 2 at the tip portions 31c / 32c is compared with the case where the tip portions 31c / 32c of the convex portions 31a / 32a have a sharp shape (for example, a triangular shape). The area increases. As a result, even if the tip portions 31c / 32c of the convex portions 31a / 32a are bent when the conveyor belt 1 is used, stress concentration of the convex portions 31a / 32a on the tip portions 31c / 32c can be suppressed, and the convex portions 31a / 32a can be suppressed. It is possible to manufacture a transport belt 1 capable of preventing the non-adhesive layer 21 from peeling off from the belt body 2 starting from the tip portions 31c and 32c.

(Manufacturing method of transport belt according to the second embodiment)
In the method for manufacturing the transport belt 1 of the second embodiment, in the step of manufacturing the endless long belt, the thermoplastic elastomer is further extruded into a sheet having a predetermined size by an extruder to form the first resin layer 23. To do.

Next, the first resin layer 23 is laminated on the transport surface side of the core canvas 22, and further, the fluororesin (PTFE) film (non-adhesive layer 21) is laminated on the transport surface side of the first resin layer 23. The endd long belt body 2 is manufactured (ended long belt manufacturing step). The other steps are the same as the method for manufacturing the transport belt of the first embodiment.

(Manufacturing method of transport belt according to the third embodiment)
In the method for manufacturing the transport belt 1 of the third embodiment, in the step of manufacturing the endless long belt of the first embodiment, an adhesive in which a thermoplastic elastomer is dissolved in an organic solvent is produced, and this adhesive is used as a canvas material (plain woven cloth). The core canvas 22 and the core canvas 24 are produced by applying the canvas material to the canvas or immersing the canvas material in an adhesive to perform an adhesive treatment and cutting the canvas material to a predetermined size.

Further, the thermoplastic elastomer is extruded into a sheet having a predetermined size by an extruder to form the first resin layer 23 and the second resin layer 25.

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

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

Specifically, the convex portion 31a of one end 31 of the belt body 2 and the concave portion 32b of the other end 32, and the concave portion 31b of one end 31 and the convex portion 32a of the other end 32 are slightly separated from each other and abutted against each other (the gap 35). (By size), between the tip 31c of the non-adhesive layer 21 of the convex portion 31a of one end 31 of the belt body 2 and the concave portion 32b that fits into the convex portion 31a, and the convex portion of the other end 32 of the belt body 2. Fitting is performed so that a gap 35 is formed between the tip portion 32c of the non-adhesive layer 21 of 32a and the concave portion 31b fitted to the convex portion 32a (fitting step).

The convex portions 31a / 32a and the concave portions 31b / 32b fitted in the fitting step are heat-pressed by a hot press in the thickness direction of the belt body 2 to exude the adhesive component of the core canvas 22 into the gap 35, and the gap is formed. With 35 buried, one end 31 and the other end 32 of the belt body 2 are heat-sealed and connected (heat-sealing step). The transport belt 1 is obtained through such a process.

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

According to the above manufacturing method, a gap 35 is provided between the tip portions 31c / 32c of the non-adhesive layer 21 of the convex portions 31a / 32a and the concave portions 31b / 32b fitted to the convex portions 31a / 32a, and the gap 35 is provided. The adhesive component of the core canvas 22 is exuded. As a result, the adhesive component of the core canvas 22 exuded into the gap 35 covers the side surface of the non-adhesive layer 21 and thus acts as a cushion for the non-adhesive layer 21, and the tips of the convex portions 31a and 32a in the non-adhesive layer 21. The stress on the portions 31c / 32c is relaxed, the non-adhesive layer 21 is suppressed from rising from below, and the non-adhesive layer 21 from the belt body 2 starting from the tip portions 31c / 32c of the convex portions 31a / 32a. It is possible to manufacture a transport belt 1 that can further prevent peeling.

(Manufacturing method of transport belt according to embodiment 5)
In the method for manufacturing the transport belt 1 of the fifth embodiment, in the step of manufacturing the endless long belt, the thermoplastic elastomer is further extruded into a sheet having a predetermined size by an extruder to form the first resin layer 23. To do.

Next, the first resin layer 23 is laminated on the transport surface side of the core canvas 22, and further, the fluororesin (PTFE) film (non-adhesive layer 21) is laminated on the transport surface side of the first resin layer 23. The endd long belt body 2 is manufactured (ended long belt manufacturing step). The other steps are the same as the method for manufacturing the transport 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 / 32a and the concave portions 31b / 32b are pressed by a heat press in the thickness direction of the belt body 2. When heat-bonding, the resin component of the first resin layer 23 is exuded into the gap 35, and with the gap 35 filled, one end 31 and the other end 32 of the belt body 2 are heat-sealed and connected (heat). Fusion process).

(Manufacturing method of transport belt according to embodiment 6)
In the method for manufacturing the transport belt 1 of the sixth embodiment, in the step of manufacturing the endless long belt, an adhesive in which a thermoplastic elastomer is dissolved in an organic solvent is prepared, and this adhesive is applied to a canvas material (plain woven cloth) or , The canvas material is dipped in an adhesive to perform an adhesive treatment, and the canvas material is cut to a predetermined size to produce a core canvas 22 and a core canvas 24.

Further, the thermoplastic elastomer is extruded into a sheet having a predetermined size by an extruder to form the first resin layer 23 and the second resin layer 25.

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

(Manufacturing method of transport belt according to embodiment 7)
In the method of manufacturing the transport belt 1 of the seventh embodiment, the endless long belt body 2 is manufactured with the same configuration as the transport belt 1 of the third embodiment.

Then, as shown in FIG. 14, at both ends (one end 31 and the other end 32) of the belt body 2, a cut is made in the central portion of the second resin layer 25 in the belt thickness direction in the belt longitudinal direction. As a result, when a notch in the belt thickness direction is made on the outer peripheral side and the inner peripheral side of the belt main body 2, it is possible to form a two-step step formed by the upper layer and the lower layer. In the belt body 2, the upper layer is the upper layer and the lower layer is the lower layer below the notch.

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

The tip of the convex portion 31a on the upper layer of the one end 31 of the belt body 2 and the convex portion 32a on the upper layer of the other end 32 (the outer peripheral side of the belt body 2 including the non-adhesive layer 21) have a roundness (arc shape). The tip of the convex portion 31c of the lower layer of one end 31 of the belt body 2 and the convex portion 32c of the lower layer of the other end 32 (the inner peripheral side of the belt body 2 not including the non-adhesive layer 21) are sharpened. Cut into a shape (triangular shape).

After that, the plurality of convex portions 31a on the upper layer of one end 31 of the belt body 2 and the plurality of concave portions 32b on the upper layer of the other end 32, and the plurality of concave portions 31b on the upper layer of the one end 31 and the plurality of convex portions on the upper layer of the other end 32. The 32a are abutted against each other and fitted to each other, and similarly, a plurality of convex portions 31c in the lower layer of one end 31 of the belt body 2, a plurality of recesses 32d in the lower layer of the other end 32, and a plurality of recesses 31d in the lower layer of the one end 31. And the plurality of convex portions 32c of the lower layer of the other end 32 are butted against each other and fitted to each other, and heat-pressed by a hot press in the thickness direction of the belt body 2 to fuse the one end 31 and the other end 32 of the belt body 2. Join by doing (step joining method).

Next, the transport belts according to Examples 1 to 11 and the conventional transport belt (convex portion having a triangular shape) according to Comparative Example 1 shown in Table 1 are produced, and a running test is performed on each transport belt. , The ease of peeling of the non-adhesive layer 21 was observed. In addition, each transport belt was analyzed by the finite element method analysis (FEM).

(Convey belts of Examples 1 to 11)
The transport belt 1 used in the first embodiment is the transport belt of the third embodiment (see FIG. 2). The transport belt 1 according to the first embodiment has 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 polyester polyurethane elastomer having a thickness of 0.3 mm, and warp threads.・ Plain woven fabric using polyester fiber for weft (with adhesive treatment) (warp (spun) fineness: 20 count, weft fineness: 1100dtex, warp density: 140 / 5cm, weft density: 56 / 5cm) The core canvas 22 of the above, 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.

Further, in the transport belt 1 used in the first embodiment, as shown in FIG. 7, the distance in the width direction between the convex portion 31a (convex portion 32a) and the convex portion 31a (convex portion 32a) is 15 mm, and the concave portion 31b. The distance between the concave portion 32b and the concave portion 32b in the longitudinal direction is 40 mm, and the radius R of the tip portions 31c of the convex portions 31a and 32a is formed to be an arc shape of 1.5 mm.

The transport belt 1 used in Examples 2 to 4 has an arc shape, 1 in which the radius R of the tip portions 31c of the convex portions 31a and 32a is 0.5 mm (Example 2) in the transport belt 1 of the above-mentioned Example 1. It is formed so as to have an arc shape of 0.0 mm (Example 3) and an arc shape of 2.0 mm (Example 4).

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

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

The transport belt 1 used in the ninth embodiment is the transport belt of the first embodiment (see FIG. 2). The transport belt 1 according to the ninth embodiment has a non-adhesive layer 21 using a PTFE film having a thickness of 5 mil (about 127 μm) and a plain weave cloth (with adhesive treatment) using polyester fibers for the warp and weft (warp (span)). Thread) fineness: 20 count, weft fineness: 1100 dtex, warp density: 140 threads / 5 cm, weft density: 56 threads / 5 cm) core canvas 22 is laminated.

The transport belt 1 used in the tenth embodiment is the transport belt of the second embodiment (see FIG. 2). The transport belt 1 according to the tenth embodiment has 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 warp threads. -Plain woven fabric using polyester fiber for weft (with adhesive treatment) (warp (spun) fineness: 20 count, weft fineness: 1100 dtex, warp density: 140/5 cm, weft density: 56/5 cm) It is configured by laminating the core body sail cloth 22 of the above.

The transport belt 1 used in the eleventh embodiment is the transport belt of the seventh embodiment (see FIGS. 13 and 14). In the transport belt 1 used in the eleventh embodiment, one end 31 and the other end 32 of the belt body 2 are fused by the step joining method described above (the fused portion is a joint portion). Further, in the transport belt 1 used in the eleventh embodiment, as shown in FIG. 15, the distance in the width direction between the convex portion and the convex portion is 15 mm, and the distance in the longitudinal direction between the convex portion and the concave portion is 35 mm. Is. The radius R of the tip of the convex portion of the upper layer of the transport belt 1 is formed to be an arc shape of 1.5 mm, and the tip portion of the convex portion of the lower layer is formed to be triangular. Further, the distance (deviation) in the longitudinal direction between the convex portion of the upper layer and the convex portion of the lower layer is 20 mm. Further, in the eleventh embodiment, the configuration other than the step joining method is the same as that in the first embodiment.

(Conveying belt of Comparative Example 1)
On the other hand, the transport belt used in Comparative Example 1 includes 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 the first embodiment. It is constructed by stacking.

Further, as shown in FIG. 7, the transport belt used in Comparative Example 1 has a triangular shape with sharp tips of the convex portions 31a and 32a, and has a convex portion 31a (convex portion 32a) and a convex portion 31a (convex). It is formed so that 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)
Each transport belt was run using the running tester shown in FIG. 8, and the states of the convex portions 31a and 32a of each transport belt after running were visually observed. Specifically, as shown in FIG. 8, the transport belts of Examples 1 to 11 and Comparative Example 1 having a width of 100 mm and a length of 1500 mm are wound around five pulleys having a pulley diameter of φ75 mm (belts). It was run at a tension of 8 kgf / cm). In this running test, the transfer belt was bent 10 million times by the five pulleys (the number of times the running test was discontinued). Then, as a judgment standard (passing standard), it was judged that the transport belt could be practically used if the tip of the non-adhesive layer was not peeled off at the stage when the transport belt was bent 2 million times.

(Running test result)

As a result of the running test, in the transport belt of Comparative Example 1, the tip of the non-adhesive layer 21 of the convex portion was peeled off by 1.7 million bending. On the other hand, in the transport belt 1 of Example 1, no abnormality was observed even after 10 million bending (no peeling). In this way, by forming the tip portions 31c and 32c of the zigzag-shaped convex portions 31a and 32a into an arc shape, the tip portion of the convex portion has a sharp shape (triangular shape, etc.) as compared with the case where the convex portion has a sharp shape (triangular shape, etc.). The non-adhesive layer 21 is less likely to be peeled off from the tip portions 31c / 32c of the convex portions 31a / 32a.

Further, there are three types having different radii R from Example 1 (radius R = 1.5 mm) (Example 2: Radius R = 0.5 mm, Example 3: Radius R = 1.0 mm, Example 4: As a result of a running test, even if the transport belt has a radius R = 2.0 mm), the tip of the non-adhesive layer does not peel off even if the transport belt is bent 2 million times, and durability that can be used as a transport belt can be obtained. It was. The number of times of bending until the tip of the non-adhesive layer is peeled is Example 2 (radius R = 0.5 mm, 2.5 million times) <Example 3 (radius R = 1.0 mm, 7 million times) <Implementation Example 1 (radius R = 1.5 mm, no abnormality up to 10 million times) = Example 4 (radius R = 2.0 mm, no abnormality up to 10 million times) increases in this order, and the larger the radius R, the more non-adhesive layer It was found that the tip of the tip was less likely to peel off.

Further, there are also two types of transport belts (Example 5: PTFE thickness 1.0 mil, Example 6: PTFE thickness 20 mil) in which the thickness of the non-adhesive layer is different from that of Example 1 (PTFE thickness 5 mil). As a result of the running test, durability performance far exceeding the passing standard of 2 million times was obtained. However, in Example 5 (1.0 mil), the non-adhesive layer partially disappeared (worn) due to friction after bending 9 million times, and in Example 6 (20 mil), cracks occurred on the surface after bending 7.5 million times. did. As a result, it was found that the durability of the non-adhesive layer was inferior when the thickness of the non-adhesive layer was thin, and the bending resistance was inferior when the thickness was thick, as compared with Example 1 (5 mil).

In addition, as a result of running tests, two types of transport belts (Example 7: width 0.5 mm, Example 8: width 1.0 mm) having different gaps 35 from Example 1 were both 10 million times. It completed the race without any abnormalities until bending, and the durability performance far exceeded the passing standard of 2 million times.

Further, even in the transport belt 1 of the 9th and 10th embodiments, the same as in the 1st embodiment, the passing standard "2 million times bending" is greatly exceeded, and the vehicle completes up to "10 million times bending" without any abnormality. Sufficient durability was confirmed.

Further, as a result of the running test, the same durability performance as that of the first embodiment was confirmed for the transport belt 1 of the eleventh embodiment.

(Running test when foreign matter is caught)
Next, Example 11 (with a step at the joint) and Example 1 (at the joint) under the following running conditions assuming that the transport belt runs with a foreign object sandwiched between the transport belt and the pulley. (No step) was compared and verified.

In the running test in the case where a foreign substance was sandwiched, the running tester (5-axis running tester) shown in FIG. 16 was used to run the transport belt, and the belt running time until the joint was broken was measured. Specifically, in order to reproduce the state in which foreign matter is caught between the inner peripheral side of the transport belt and the pulley on two pulleys with a diameter of 75 mm of the traveling tester, the width of 10 mm is located at the center of the pulley in the axial direction. The adhesive tape was wound so as to have a thickness of 1.5 mm to provide a convex portion (foreign matter). In addition, a 24-hour running test was conducted under the conditions that the belt tension was 1 N / mm and the belt speed was 100 m / min. Then, as an evaluation method, the belt running time until the joint was broken 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 the joint portion has a step on the outer peripheral side and the inner peripheral side of the joint portion of the transport belt 1 is compared with Example 1 in which the step is not provided. It was confirmed that even when a foreign substance is caught between the inner peripheral side of the transport belt and the pulley, the joint is less likely to crack (stress concentration is alleviated by the step).

(Finite element method analysis (FEM))
With respect to the transport belts according to Example 1 and Comparative Example 1, the stress concentration at the tip of the convex portion was analyzed by the finite element method analysis (FEM) to verify the effect of the present invention.

Specifically, with respect to the transport belts according to Example 1 and Comparative Example 1, as shown in FIG. 9, a linear tensile force and a linear tensile force so that the tension applied to the transport belt is 8 N / mm. , The stress concentration at the tip of the convex part 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. In this analysis result, 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 is shown, and the higher the bar on the left side of the figure, the higher the stress. The stress value in the figure is the maximum stress value applied to the transport belt (Mises stress).

Stress is concentrated on the tip of the convex portion of the non-adhesive layer 21 of Comparative Example 1, but stress is not concentrated on the tip of the convex portion of the non-adhesive layer 21 of Example 1 as compared with Comparative Example 1. .. As a result, it can be seen that when the conveyor belt is pulled and forwardly bent, the stress applied to the tip is suppressed when the tip of the convex portion has an arc shape. It is considered that stress is likely to be concentrated on the tip of the convex portion of Comparative Example 1 because the area of the non-adhesive layer 21 is extremely smaller than that of the periphery. On the other hand, it is considered that the area of the non-adhesive layer 21 at the tip is increased by forming the tip of the convex portion into an arc shape as in the first embodiment, and the stress concentration on the tip can be suppressed.

Next, the effect of the resin component oozing from the gap 35 when the gap 35 was formed in the transport belt 1 used in Example 1 was analyzed by the finite element method analysis (FEM), and the effect of the present invention was verified. .. The width A between the tip portion 31c and the concave portion 32b of the convex portion 31a shown in FIG. 3 is changed for the resin component (bleeding amount) exuded from the lower layer (first resin layer 23) into the gap 35 (width A: 0 mm). (No gap), 0.5 mm, 1.0 mm), analysis was performed.

The analysis result is shown in FIG. According to this analysis result, the larger the amount of the resin component exuded into the gap 35 (the larger the gap 35), the more the stress concentration on the tip of the convex portion is suppressed, and the cushioning property of the exuded resin component is improved. It can be seen that the height is increased and the tip portion of the convex portion of the non-adhesive layer 21 is suppressed from trying to rise from the lower layer (first resin layer 23).

Although the embodiments of the present invention have been described above with reference to the drawings, it should be considered that the specific configuration is not limited to these embodiments and examples. Moreover, the scope of the present invention is shown not only by the description of the above-described embodiments and examples but also by the scope of claims, and further includes all modifications within the meaning and scope equivalent to the scope of claims.

1 Conveying belt 2 Belt body 21 Non-adhesive layer 22 Core canvas 23 First resin layer 24 Core canvas 25 Second resin layer 31 One end 31a Convex 31b Recess 31c Tip 32 End 32a Convex 32b Recess 32c Tip 35 Gap

Claims (10)

An endless transport in which one end and the other end in the longitudinal direction of the belt body in which the non-adhesive layer serving as the transport surface and the first core canvas layer laminated on the lower layer of the non-adhesive layer are laminated are connected. It ’s a belt,
The one end and the other end of the belt body on which the non-adhesive layer is laminated have convex portions and concave portions alternately provided along the width direction intersecting the longitudinal direction, respectively, and the convex portion of the one end. 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 so as to fit each other.
The non-adhesive layer is a single-layer film and
The thickness of the non-adhesive layer is 25 to 508 μm.
The tip of the convex portion has an arc shape with a radius of 0.5 to 2.0 mm when the transport surface is viewed from an orthogonal direction .
Between the convex portion and the concave portion that fits into the convex portion, there is a gap only between the tip portion of the non-adhesive layer of the convex portion and the bottom of the concave portion that fits into the convex portion. Has been formed and
The first core canvas layer contains an adhesive, and the adhesive has exuded into the gap.
A transport belt characterized in that the width of the gap in the longitudinal direction is in the range of 0.1 to 1.0 mm . A belt in which a non-adhesive layer serving as a transport surface, a first resin layer laminated on the lower layer of the non-adhesive layer, and a first core canvas layer arranged on the lower layer of the first resin layer are laminated. An endless transport belt in which one end and the other end in the longitudinal direction of the main body are connected.
The one end and the other end of the belt body on which the non-adhesive layer is laminated have convex portions and concave portions alternately provided along the width direction intersecting the longitudinal direction, respectively, and the convex portion of the one end. 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 so as to fit each other.
The non-adhesive layer is a single-layer film and
The thickness of the non-adhesive layer is 25 to 508 μm.
The tip of the convex portion has an arc shape with a radius of 0.5 to 2.0 mm when the transport surface is viewed from an orthogonal direction .
Between the convex portion and the concave portion that fits into the convex portion, there is a gap only between the tip portion of the non-adhesive layer of the convex portion and the bottom of the concave portion that fits into the convex portion. The first resin layer is formed and exudes into the gap.
A transport belt characterized in that the width of the gap in the longitudinal direction is in the range of 0.1 to 1.0 mm . The transport belt according to claim 1 or 2 , wherein the non-adhesive layer is made of a resin. The transport belt according to claim 3 , wherein the non-adhesive layer is formed of a fluororesin. The transport belt according to claim 4 , wherein the non-adhesive layer is a film-like fluororesin layer. The belt body further
A second resin layer laminated on the lower layer of the first core canvas layer,
The transport belt according to claim 2 , wherein a second core canvas layer arranged under the second resin layer is laminated. The transport belt according to claim 6 , wherein the first resin layer and the second resin layer are a thermoplastic resin or a thermoplastic elastomer. The transport belt according to claim 1 , wherein the adhesive contained in the first core canvas layer is a thermoplastic resin or a thermoplastic elastomer. The transport belt according to claim 7 or 8 , wherein the thermoplastic resin or the thermoplastic elastomer is a polyether polyurethane or a polycarbonate polyurethane. One end and the other end in the longitudinal direction of the belt body, which is a transport surface and is obtained by laminating a single-layer film-like non-adhesive layer having a thickness of 25 to 508 μm and an adhesive-treated first core canvas or first resin layer. The concave portion and the convex portion having an arc shape having a radius of 0.5 to 2.0 mm are processed so as to be alternately arranged along the width direction intersecting the longitudinal direction, and the convex portion and the convex portion in between the recess to be fitted to the convex portion, respectively only between the bottom of the recess to be fitted to the tip and the convex portion of the non-adhesive layer of the convex portion, said longitudinal width 0 .The uneven part processing process that processes so that a gap in the range of 1 to 1.0 mm is created, and
The convex portion at one end and the concave portion at the other end, and the concave portion at one end and the convex portion at the other end are abutted against each other, and the convex portion is fitted into the tip portion of the non-adhesive layer and the convex portion. A fitting step of fitting so that a gap having a width in the longitudinal direction of 0.1 to 1.0 mm is formed only between the recess and the bottom of the recess.
The convex portion and the concave portion fitted in the fitting step are heat-pressed by a hot press in the thickness direction of the belt body, and the adhesive component of the first core canvas or the first resin layer is formed in the gap. A method for manufacturing a transport belt, which comprises a heat-sealing step of heat-sealing and connecting one end and the other end of the belt body in a state where the resin component is exuded and the gap is filled.