JP2023079772A - belt - Google Patents

Abstract

To provide a belt capable of achieving excellent durability by suppressing bending at a joint.SOLUTION: According to one embodiment, a belt is provided. A belt 10 has a strip-like belt base material 1 having a first end portion 1a and a second end portion 1b. The first end portion 1a and the second end portion 1b are abutted against each other and joined to form a joint portion 1c so that the belt base material 1 forms an annular structure. The first end portion 1a includes a plurality of first protrusions 31a and a plurality of first recesses 31b. The second end portion includes a plurality of second protrusions 32a and a plurality of second recesses 32b. Each of the plurality of first protrusions 31a is fitted with each of the plurality of second recesses 32b. Each of the plurality of second protrusions 32a is fitted with each of the plurality of first recesses 31b. The belt 10 further includes a backing 2 and a first layer 3.SELECTED DRAWING: Figure 1

Description

It relates to belts, in particular belts used in the manufacture of products and the like.

2. Description of the Related Art Belts used in manufacturing various products such as heat seals have, for example, an endless or annular structure in which the ends of the belt substrate in the length direction are joined together. For example, butt joining is known as a method for joining belt base materials.

JP-A-10-291617 Japanese Patent Application Laid-Open No. 2000-344318

Butt splicing is a method in which the ends of the belt base material are butted together, and another base material is fused onto the front and/or back surface of the abutment (also called the joint) so that the joints do not separate. It is a joining method that reinforces

A reference example of a belt manufactured using butt bonding is shown in FIGS. 12 and 13. FIG. FIG. 12 shows the belt 100 having an annular structure attached to the roll 20 . FIG. 13 is a schematic cross-sectional view enlarging the vicinity of the joint portion 50c of the belt base material 50 shown in FIG.

A belt 100 shown in FIG. 12 includes a strip-shaped belt base material 50 , a backing material 40 , and a first adhesive layer 60 bonding the belt base material 50 and the backing material 40 together. The strip-shaped belt base material 50 is a rectangular sheet having two long sides 55 and 56 facing each other and two short sides facing each other. One of the two short sides of the strip-shaped belt base material 50 is the first end 50a. The other of the two short sides of the strip-shaped belt base material 50 is the second end 50b.

The first end portion 50a and the second end portion 50b are butted and joined to form a joint portion 50c so that the belt base material 50 has a ring-shaped structure or an endless shape. That is, the belt base material 50 can be an endless belt.

Both the first end portion 50 a and the second end portion 50 b are sides extending in a direction orthogonal to the long sides 55 and 56 of the belt base material 50 . Therefore, a joint portion 50 c formed by abutting these extends in a direction orthogonal to the long side of the belt base material 50 or the traveling direction P of the belt 100 . When the belt 100 runs along the traveling direction P, the joint portion 50c comes into contact with the outer peripheral wall of the roll 20 via the backing material 40. As shown in FIG. Since the joint portion 50c extends parallel to the rotation axis (not shown) of the cylindrical roll 20, there is a problem that the joint portion 50c is easily broken when the belt 100 comes into contact with the outer peripheral wall of the roll 20.

SUMMARY OF THE INVENTION An object of the present invention is to provide a belt that can achieve excellent durability by suppressing bending at joints.

According to one embodiment, a belt is provided. The belt comprises a heat-resistant woven fabric and a fluororesin covering at least part of the surface of the heat-resistant woven fabric, and has a belt base material having a front surface and a back surface. The belt base material has a strip shape having a first end and a second end. The first end and the second end are butted against each other and joined to form a joint so that the belt base material forms a ring structure. The first end includes a plurality of first projections and a plurality of first recesses defined between the plurality of first projections. The second end comprises a plurality of second projections and a plurality of second recesses defined between the plurality of second projections. Each of the plurality of first protrusions is fitted with each of the plurality of second recesses. Each of the plurality of second protrusions is fitted with each of the plurality of first recesses. The belt further includes a backing material facing the back surface of the belt base material and covering at least a portion of the joint portion, and a first layer interposed between the belt base material and the backing material.

ADVANTAGE OF THE INVENTION According to this invention, the belt which can achieve the outstanding durability can be provided by suppressing bending in a joint part.

The perspective view which shows roughly an example of the belt which concerns on embodiment. FIG. 2 is a plan view schematically showing the belt shown in FIG. 1; FIG. 3 is a schematic cross-sectional view of the belt shown in FIG. 2 taken along line III-III; FIG. 2 is a schematic cross-sectional view of a belt base material included in the belt shown in FIG. 1; The top view which expands and shows the A section of FIG. FIG. 2 is a plan view schematically showing the back surface of the belt shown in FIG. 1; FIG. 11 is a plan view schematically showing the back surface of a belt according to another example; FIG. 11 is a plan view schematically showing the back surface of a belt according to another example; Sectional drawing which shows roughly the other example of the belt which concerns on embodiment. Sectional drawing which shows roughly the other example of the belt which concerns on embodiment. FIG. 4 is a plan view schematically showing another example of the belt according to the embodiment; The perspective view which shows roughly an example of the belt which concerns on a reference example. FIG. 13 is a cross-sectional view schematically showing the vicinity of the joint portion of the belt shown in FIG. 12;

Hereinafter, embodiments will be described with reference to the drawings as appropriate. In addition, the same code|symbol shall be attached|subjected to the common structure through embodiment, and the overlapping description is abbreviate|omitted. In addition, each drawing is a schematic diagram for explaining the embodiments and promoting understanding thereof, and there are places where the shapes, dimensions, ratios, etc. are different from the actual device, but these are the following explanations and known techniques. Consideration can be taken into consideration and the design can be changed as appropriate.

FIG. 1 shows a state in which a belt 10 according to an embodiment is attached to a roll 20. As shown in FIG. FIG. 2 is a plan view schematically showing the belt 10. FIG. FIG. 3 is a schematic cross-sectional view of the belt 10 shown in FIG. 2 along line III--III. FIG. 4 is a schematic cross-sectional view of the belt base material 1 included in the belt 10. As shown in FIG. The X-axis in the drawings is a direction parallel to the advancing direction (also referred to as running direction) P of the belt 10 . The Y-axis is a direction perpendicular to the X-axis. The Z-axis is a direction orthogonal to both the X-axis and the Y-axis and parallel to the thickness direction of the belt base material 1 .

The belt 10 includes a strip-shaped belt base material 1 , a backing material 2 , and a first layer 3 interposed between the belt base material 1 and the backing material 2 . The first layer 3 adheres or fuses the belt base material 1 and the backing material 2 . The first layer 3 integrates the belt base material 1 and the backing material 2 . As shown in FIG. 2, the strip-shaped belt base material 1 is a rectangular sheet having two long sides 15a and 15b facing each other and two short sides 1a and 1b facing each other. One of the two short sides of the strip-shaped belt base material 1 is the first end 1a. The other of the two short sides of the strip-shaped belt base material 1 is the second end 1b. Both the first end portion 1a and the second end portion 1b have an uneven structure.

The first end portion 1a includes a plurality of first protrusions 31a. The plurality of first protrusions 31a protrude along the in-plane direction of the belt base material 1, respectively. An in-plane direction is a direction along the X-axis and/or the Y-axis. Each of the plurality of first protrusions 31a may have a forward tapered shape. However, the thickness (the length in the Z-axis direction) of the plurality of first protrusions 31a is substantially constant regardless of their positions.

The second end 1b has a plurality of second projections 32a. Each of the plurality of second protrusions 32 a protrudes along the in-plane direction of the belt base material 1 . Each of the plurality of second protrusions 32a may have a forward tapered shape. However, the thickness (the length in the Z-axis direction) of the plurality of second protrusions 32a is substantially constant regardless of their positions.

Details of the first end portion 1a and the second end portion 1b will be described later. and constitutes the joint portion 1c. That is, the belt base material 1 can be an endless belt. In the belt base material 1 having an annular structure, the inner peripheral surface is defined as the back surface 9 and the outer peripheral surface is defined as the front surface 8 . The back surface 9 of the belt substrate 1 can contact the outer peripheral wall of the roll 20 . The back surface 9 of the belt base material 1 moves along the circumferential direction as the roll 20 rotates while being in contact with the outer peripheral wall of the roll 20 . As a result, the belt 10 runs along the traveling direction P. As shown in FIG. Roll 20 may be a driving roll or a driven roll.

As described above, the joint portion 1c is configured by abutting the first end portion 1a and the second end portion 1b, each having an uneven structure. Unlike the joint portion 50c shown with reference to FIG. 12 as a reference example, the joint portion 1c does not extend along the direction parallel to the width direction (Y-axis direction) of the belt base material 1. As shown in FIG. Therefore, the load on the joint portion 1c due to the contact of the belt base material 1 with the roll 20 is dispersed, and excessive bending at the joint portion 1c is suppressed. Therefore, the belt 10 according to the embodiment can achieve excellent durability.

As shown in FIG. 4 , the belt base material 1 includes, for example, a heat-resistant woven fabric 11 and a fluororesin 12 covering at least a portion of the surface of the heat-resistant woven fabric 11 . The fluororesin 12 may partially cover the surface of the woven fabric 11 or may cover the entire surface.

The thickness of the belt base material 1 is not particularly limited, but can be in the range of 0.075 mm to 1.0 mm, for example.

Materials included in the belt base material 1 will be described. Examples of the heat-resistant woven fabric 11 include glass fiber, aramid fiber, carbon fiber, and a mixture of glass fiber and aramid fiber. Glass fibers are nonflammable and electrically insulating. On the other hand, aramid fibers have excellent strength and chemical resistance.

Examples of the fluorine resin 12 include polytetrafluoroethylene (PTFE), tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin (PFA), tetrafluoroethylene-hexafluoropropylene copolymer resin (FEP), and the like. One type or two or more types of fluororesin can be used.

The belt base material may contain a filler. The filler is desirably mixed or dispersed in the fluororesin. Examples of fillers include carbon materials, inorganic substances (titanium oxide, boron nitride, silicon oxide, zinc oxide, etc.), and various pigments. One type or two or more types of fillers can be used. The form of the filler is not particularly limited, and may be granular, fibrous, acicular, or the like.

The backing material 2 faces the back surface 9 of the belt base material 1 and covers at least part of the joint portion 1c. The backing material 2 is adhered to the back surface 9 of the belt base material 1 via the first layer 3 in order to maintain the bonding between the first end 1a and the second end 1b. The backing material 2 preferably covers the entire joint portion 1c. In other words, it is preferable that the backing material 2 faces the entire joining portion 1c. In this case, it is possible to further suppress separation between the first end portion 1a and the second end portion 1b.

As the backing material 2, for example, the same base material as the belt base material 1 is used. In this case, it is possible to suppress a decrease in mechanical strength in the vicinity of the joint portion 1c. The backing material 2 may be a different base material than the belt base material 1 . Even in that case, the base material may contain the heat-resistant woven fabric described as the material constituting the belt base material 1 and the fluororesin covering at least part of the heat-resistant woven fabric. Alternatively, the backing 2 may be a polyimide film. The thickness of the backing 2 can be, for example, in the range 0.050 mm to 1.0 mm.

The first layer 3 covers at least part of the joint portion 1 c on the back surface 9 of the belt base material 1 . The first layer 3 preferably covers the entire joint portion 1c. The first layer 3 adheres or fuses the belt base material 1 and the backing material 2 . The first layer 3 and the backing material 2 are fused so as to straddle the joint portion 1c where the first end portion 1a and the second end portion 1b are butted together, thereby forming the first end portion 1a and the second end portion 1b. Separation from the end portion 1b can be suppressed.

The first layer 3 preferably contains a melt-flowable fluororesin. The first layer 3 may be made of a melt-flowable fluororesin. Examples of melt-flowable fluororesins include PFA and FEP. The thickness of the first layer 3 is, for example, within the range of 12.5 μm to 250 μm.

Details of the first end portion 1a and the second end portion 2a will be described with reference to FIG. 5 is a plan view showing an enlarged portion A shown in FIG. 2. FIG.

The first end portion 1a includes a plurality of first protrusions 31a and a plurality of first recesses 31b defined between the plurality of first protrusions 31a. The number of the plurality of first projections is, for example, 2 or more, preferably 5 or more. The second end portion 1b includes a plurality of second protrusions 32a and a plurality of second recesses 32b defined between the plurality of second protrusions 32a. The number of the plurality of second protrusions is, for example, 2 or more, preferably 5 or more.

Each of the plurality of first protrusions 31a is fitted with each of the plurality of second recesses 32b. Each of the plurality of second protrusions 32a is fitted with each of the plurality of first recesses 31b. In this way, the joining portion 1c is configured by fitting the concave-convex structure of the first end portion 1a and the concave-convex structure of the second end portion 1b. The joint portion 1c may be a portion where the end surfaces (side surfaces) of the belt base material 1 are butted against each other.

The first end portion 1a and the second end portion 1b can be butted against each other at the joint portion 1c so as not to cause a step in the Z-axis direction. Moreover, it is preferable that the first end portion 1a and the second end portion 1b be configured so as not to cause a step in the Y-axis direction at the end portion of the joint portion 1c along the Y-axis direction.

The plurality of first protrusions 31a are arranged along the width direction (Y-axis direction) of the belt base material 1 . In FIG. 5, a virtual line segment 31x is defined that connects the tips 31c of the plurality of first projections 31a. Also, the plurality of second protrusions 32 a are arranged along the width direction of the belt base material 1 . In FIG. 5, a virtual line segment 32x is defined that connects the tips 32c of the plurality of second protrusions 32a.

FIG. 5 depicts a case where the tip portions 31c of the plurality of first protrusions 31a and the tip portions 32c of the plurality of second protrusions 32a have an acute angular shape. It may have an R shape tinged with. Since the leading end portion has an R shape, it is possible to suppress the rising or turning up of the belt base material at the leading end portion.

The length 30L of each of the plurality of first protrusions 31a may be the same or different. As an example, FIG. 5 shows a case where the lengths 30L of the plurality of first protrusions 31a are the same as each other. Since the concave-convex structure of the first end portion 1a and the concave-convex structure of the second end portion 1b are fitted together, the length 30L can also be the length of the plurality of second convex portions 32a.

The length 30L is the length of a perpendicular drawn from the tips 31c of the plurality of first projections 31a toward the virtual line segment 32x. When measuring the length 30L, the length 30L is measured for five or more arbitrarily selected first protrusions 31a among the plurality of first protrusions 31a of the belt base material 1 to be measured. A value obtained by simply averaging these values is determined as the length 30L of the plurality of first protrusions 31a or the plurality of second protrusions 32a.

The length 30L can be appropriately changed according to the diameter of the roll 20, the thickness of the belt base material 1, and the like, and is, for example, within the range of 10 mm to 30 mm. When the length 30L is small, even when a roll 20 having a small roll diameter is used, the effect of suppressing bending is likely to be obtained. However, if the length 30L is excessively small, there is a tendency that it is difficult to obtain the effect of suppressing bending at the joint portion 1c. When the length 30L is large, even when a roll 20 having a large roll diameter is used, an effect of suppressing bending can be expected.

The arrangement interval of the plurality of first protrusions 31a is indicated by the width 31w of each first protrusion 31a. The width 31w of each first protrusion 31a is the distance from the tip 32c of a certain second protrusion 32a to the tip 32c of the adjacent second protrusion 32a. When measuring the width 31w, the width 31w is measured for each of five or more arbitrarily selected first protrusions 31a. A value obtained by simply averaging these values is determined as the width 31w.

Regarding the plurality of first protrusions 31a, the dimension of the width 31w of each first protrusion 31a is not particularly limited, but is within the range of 6 mm to 30 mm, for example.

The arrangement interval of the plurality of second protrusions 32a is indicated by the width 32w of each second protrusion 32a. The width 32w of each second protrusion 32a is the distance from the tip 31c of a certain first protrusion 31a to the tip 31c of the adjacent first protrusion 31a. When measuring the width 32w, the width 32w is measured for each of five or more arbitrarily selected second protrusions 32a. A value obtained by simply averaging these values is determined as the width 32w.

Regarding the plurality of second protrusions 32a, the dimension of the width 32w of each second protrusion 32a is not particularly limited, but is, for example, within the range of 6 mm to 30 mm.

The dimension of the width 31w and the dimension of the width 32w may be different or the same. The dimension of the width 31w and the dimension of the width 32w can be appropriately changed according to the diameter of the roll 20, the thickness of the belt base material 1, and the like.

FIG. 6 is a plan view schematically showing an example when the joint portion 1c is observed from the back surface 9 side of the belt base material 1. As shown in FIG. In FIG. 6, the entire joint 1c is covered with the backing material 2. In FIG. The shape of the joint portion 1c is such that a plurality of first recesses and a plurality of second protrusions are fitted together, and a plurality of first protrusions and a plurality of second recesses are fitted together. As long as there is no particular limitation. As an example in FIG. 6, the plurality of first protrusions and the plurality of second protrusions both have a forward tapered shape, but the plurality of first protrusions and the plurality of second protrusions It may have the shape shown in FIG. Details of the shape of the joint portion 1c shown in FIG. 7 will be described later with reference to FIG.

Although the shape of the backing material 2 is not particularly limited, it has, for example, a belt shape (rectangular shape) capable of covering the joint portion 1c. The strip-shaped backing material 2 is placed on the back surface 9 of the belt base material 1 such that the long side direction is parallel to the Y axis direction and the short side direction is parallel to the X axis. not shown).

The dimension of the backing material 2 in the X-axis direction is preferably larger than the length 30L of the plurality of first protrusions 31a or the plurality of second protrusions 32a. The dimension of the backing material 2 in the Y-axis direction is preferably the same or substantially the same as the width 1w of the belt base material 1 in the Y-axis direction.

FIG. 8 is a plan view schematically showing a backing material 2 according to another example. The backing material 2 in FIG. 8 has the same shape as the band-like backing material 2 shown in FIG. 6 except that the long side portions of the backing material 2 are corrugated. Since the backing material 2 has corrugations in the direction parallel to the width direction (Y-axis direction) of the belt, when the backing material 2 contacts the outer peripheral wall of the roll 20, the back surface 9 of the belt base material 1 can reduce damage to

<Modification>
FIG. 9 is a cross-sectional view schematically showing another example of the belt according to the embodiment; The belt 10 shown in FIG. 9 is described with reference to FIGS. 1 to 5, except that the belt 10 shown in FIG. It has a structure similar to a belt with The protective film 4 covers at least part of the joint portion 1 c on the surface 8 of the belt base material 1 . The protective film 4 preferably covers the entire joint portion 1 c on the surface 8 of the belt base material 1 .

When the belt 10 is provided with the protective film 4, it is possible to suppress the invasion of the work into the joint portion 1c from the surface 8 side of the belt base material 1, and the tip portions 31c of the plurality of first convex portions 31a and , the tip portions 32c of the plurality of second protrusions 32a can be suppressed from being turned over.

Although not shown, the dimension of the protective film 4 in the traveling direction P of the belt 10 is preferably larger than the length 30L of the plurality of first protrusions 31a or the plurality of second protrusions 32a. Moreover, it is preferable that the dimension of the protective film 4 in the Y-axis direction is the same as or substantially the same as the width 1w of the belt base material 1 in the Y-axis direction. The protective film 4 may have corrugations along its long sides (direction parallel to the Y-axis), similar to the backing material 2 shown in FIG.

The protective film 4 preferably contains a melt-flowable fluororesin. The protective film 4 may be made of a melt-flowable fluororesin. In other words, the protective film 4 does not have to be provided with a heat-resistant woven fabric. Examples of melt-flowable fluororesins include PFA and FEP. The thickness of the protective film 4 is, for example, within the range of 12.5 μm to 250 μm.

FIG. 10 is a cross-sectional view schematically showing another example of the belt according to the embodiment; A belt 10 shown in FIG. 6, has the same construction as the belt described with reference to FIGS. The surface material 5 may cover at least a portion of the joint portion 1c, but preferably covers the entire joint portion 1c. In other words, the surface material 5 preferably faces the entire joint portion 1c.

If the belt 10 further includes the surface material 5, it is possible to suppress the penetration of the work into the joint portion 1c from the surface 8 side of the belt base material 1, and the tip portions 31c of the plurality of first protrusions 31a can be prevented. , and the tip portions 32c of the plurality of second protrusions 32a can be prevented from being turned over.

A step in the Z-axis direction caused by the surface material 5 tends to be directly transferred to the work. Therefore, it is preferable to use a thinner base material as the front material 5 than the belt base material 1 .

The surface material 5 may include the heat-resistant woven fabric described as the material constituting the belt base material 1 and a fluororesin covering at least a portion of the heat-resistant woven fabric. The surface material 5 may be the same base material as the belt base material 1 .

Although not shown, the dimension of the front member 5 in the traveling direction P of the belt 10 is preferably larger than the length 30L of the plurality of first protrusions 31a or the plurality of second protrusions 32a. Moreover, it is preferable that the dimension of the front member 5 in the Y-axis direction is the same as or substantially the same as the width 1w of the belt base material 1 in the Y-axis direction. As with the backing material 2 shown in FIG. 8, the front material 5 may have corrugations along its long sides (direction parallel to the Y-axis).

The thickness of the front material 5 can be, for example, in the range of 25 μm to 100 μm. If the facing material 5 is a base material (fabric) including woven fabric, its thickness can be, for example, within the range of 50 μm to 125 μm. If the face material 5 is a film without woven fabric, its thickness can be, for example, in the range from 25 μm to 100 μm.

The second layer 6 covers at least part of the joint portion 1 c on the surface 8 of the belt base material 1 . The second layer 6 adheres or fuses the belt base material 1 and the surface material 5 . The second layer 6 integrates the belt base material 1 and the surface material 5 . The second layer 6 and the surface material 5 are attached so as to straddle the joint portion 1c where the first end portion 1a and the second end portion 1b are butted against each other, so that the first end portion 1a and the second end portion Separation from the portion 1b can be suppressed.

The second layer 6 preferably contains a melt-flowable fluororesin. The second layer 6 may be made of a melt-flowable fluororesin. Examples of melt-flowable fluororesins include PFA and FEP. The thickness of the second layer 6 is, for example, within the range of 12.5 μm to 250 μm.

1 to 6 and 8 to 10 illustrate the case where the plurality of first convex portions 31a and the plurality of second convex portions 32a are forward tapered. However, the shapes of the plurality of first protrusions 31a and the plurality of second protrusions 32a may be other shapes as long as the direction in which the joint portion 1c extends is not parallel to the width direction (Y-axis direction) of the belt base material 1. may have

FIG. 11 is a plan view schematically showing a case where the plurality of first protrusions 31a and the plurality of second protrusions 32a have different shapes. In the belt base material 1 shown in FIG. 11 , each of the plurality of first projections 31a has a part that is forward tapered, and at least part of the tip part has a shape that is larger in diameter than the midsection. have Similarly, each of the plurality of second protrusions 32a has a part that is forward tapered, and at least a part of the distal end has a shape with a larger diameter than the midsection.

The tips of the plurality of first protrusions 31a and the tips of the plurality of second protrusions 32a may or may not have a rounded R shape. FIG. 11 illustrates a case where the tips of the plurality of first protrusions 31a and the tips of the plurality of second protrusions 32a have rounded shapes. In this case, it is possible to suppress the rising or turning up of the belt base material at the leading edge.

When the plurality of first protrusions 31a and the plurality of second protrusions 32a have at least a portion of the distal end portion with a larger diameter than the midsection, the following effects can be obtained. Even when tension is applied to the joint portion 1c, the enlarged diameter portion of the first convex portion 31a and the enlarged diameter portion of the second convex portion 32a are engaged with each other. Thereby, it is possible to suppress the looseness (separation between the first end portion 1a and the second end portion 1b) at the joint portion 1c.

<Manufacturing method>
A belt according to embodiments may be formed, for example, in the following manner.

First, a strip-shaped belt base material having a desired length is prepared. Two short sides of the belt base material are punched out using a punching die so as to have an uneven structure. At this time, the belt base material is punched out so that the punched first end portion 1a and the second end portion 1b can be joined to each other.

The produced first end portion 1a and second end portion 1b are brought into contact with each other, and the belt base material 1 is held so as to be endless. Next, from the back surface 9 side (inner peripheral surface) of the belt base material 1, melt flow as the first layer 3 so as to cover the joint portion 1c where the first end portion 1a and the second end portion 1b are butted against each other. The flexible fluororesin film and the backing material 2 are arranged in this order, and they are subjected to a hot press and heated to the melting point of the melt-flowable fluororesin contained in the first layer 3 or higher. Thus, the backing material 2 can be fused onto the back surface 9 of the belt substrate 1 via the first layer 3 .

As the first layer 3, instead of using a melt-flowable fluororesin film, a dispersion containing fluororesin particles may be applied. In this case, first, on the back surface 9 side of the belt base material 1, a dispersion is applied so as to cover the joint portion 1c to prepare a coating film. Next, the backing material 2 is laminated on the coating film and subjected to hot pressing to fuse the backing material 2 onto the back surface 9 of the belt base material 1 via the first layer 3. can be done.

Thus, the belt according to the embodiment can be produced.

When the protective film 4 covering the joint portion 1c is further provided on the surface 8 side (peripheral surface) of the belt base material 1, it can be produced, for example, by the following procedure. As the protective film 4, for example, a melt-flowable fluororesin film having a size capable of covering the entire joint portion 1c is prepared. The film is placed so as to cover the joining portion 1c on the surface 8 side, and is fused to the belt base material 1 by hot pressing.

Further, when the second layer 6 covering the joint portion 1c and the surface material 5 laminated on the second layer 6 are further provided on the surface 8 side of the belt base material 1, they are produced, for example, by the following procedure. be able to. A melt-flowable fluororesin film as a second layer 6 and a surface material 5 are arranged in this order from the surface 8 side of the belt base material 1 so as to cover the joint portion 1c, and these are hot-pressed to form a belt base. It is fused onto the surface 8 of the material 1 .

Alternatively, instead of using a melt-flowable fluororesin film as the second layer 6, a dispersion containing fluororesin particles may be applied. First, on the surface 8 side of the belt base material 1, a coating film is produced by applying a dispersion so as to cover the joint portion 1c. Next, the surface material 5 is laminated on the coating film and subjected to hot pressing to fuse the surface material 5 onto the surface 8 of the belt base material 1 via the second layer 6. can be done.

The belts of the embodiments can be used to manufacture products, for example, as belts for heat sealing machines, food production lines, frozen food production lines, conveyor belts used in production lines for plastic films and flooring materials, and the like.

It should be noted that the present invention is not limited to the above-described embodiments, and can be variously modified in the implementation stage without departing from the gist of the present invention. Further, each embodiment may be implemented in combination as appropriate, in which case the combined effect can be obtained. Furthermore, various inventions are included in the above embodiments, and various inventions can be extracted by combinations selected from a plurality of disclosed constituent elements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiments, if the problem can be solved and effects can be obtained, the configuration with the constituent elements deleted can be extracted as an invention.

DESCRIPTION OF SYMBOLS 1... Belt base material 1a... 1st end part 1b... 2nd end part 1c... Joining part 2... Backing material 3... First layer 4... Protective film 5... Surface material 6... Second Layer 8 Front surface 9 Back surface 10 Belt 11 Heat-resistant woven fabric 12 Fluororesin 20 Roll 31 a First protrusion 31 b First recess 31 c Tip 32 a 2nd convex part 32b... 2nd recessed part 32c... Tip part 50... Belt base material 50a... First end part 50b... Second end part 50c... Joint part 100... Belt P... Direction of movement.

Claims (6)

A belt comprising a heat-resistant woven fabric and a fluororesin covering at least part of the surface of the heat-resistant woven fabric, and comprising a belt base material having a front surface and a back surface,
The belt base material has a strip shape having a first end and a second end,
The first end portion and the second end portion are butted against each other and joined so that the belt base material forms a ring structure to form a joint portion,
The first end includes a plurality of first protrusions and a plurality of first recesses defined between the plurality of first protrusions,
The second end comprises a plurality of second protrusions and a plurality of second recesses defined between the plurality of second protrusions,
Each of the plurality of first protrusions is fitted with each of the plurality of second recesses,
Each of the plurality of second protrusions is fitted with each of the plurality of first recesses,
The belt is
a backing material that faces the back surface of the belt base material and covers at least part of the joint portion;
A belt further comprising a first layer interposed between the belt base material and the backing material. 2. The belt of claim 1, further comprising a protective film in contact with said surface of said belt substrate and covering at least a portion of said joint. a surface material that faces the surface of the belt base material and covers at least a portion of the joint portion;
2. The belt according to claim 1, further comprising a second layer interposed between said belt base material and said surface material. The belt according to any one of claims 1 to 3, wherein the shape of the plurality of first protrusions and the shape of the plurality of second protrusions are forward tapered. The shape of the plurality of first protrusions and the shape of the plurality of second protrusions are partially forward tapered, and at least a portion of the distal end portion has a larger diameter than the midsection. The belt according to any one of claims 1 to 3. The belt according to any one of claims 1 to 5, wherein the thickness of the belt base material is in the range of 0.075 mm to 1.0 mm.

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