WO2018168167A1

WO2018168167A1 - Conveyor belt

Info

Publication number: WO2018168167A1
Application number: PCT/JP2017/047314
Authority: WO
Inventors: 洋平竹原
Original assignee: バンドー化学株式会社
Priority date: 2017-03-17
Filing date: 2017-12-28
Publication date: 2018-09-20
Also published as: JPWO2018168167A1; JP2019014605A; JP6586475B2; CN110418758A

Abstract

The present invention provides a conveyor belt which exhibits excellent non-adhesiveness to an article being conveyed and which can suppress detachment of a coating layer while limiting rigidity. This conveyor belt uses canvas as a core material and is provided with: a first rubber layer that is laminated on one surface of the canvas and that comprises mainly a polycarbonate-based polyurethane; and a coating layer that is laminated on the first-rubber-layer surface which is opposite the canvas and that comprises mainly a tetrafluoroethylene-hexafluoropropylene copolymer. The coating layer has surface modification groups at the surface that is bonded to the first rubber layer. The average thickness of the coating layer is preferably 50 μm or less. The surface modification groups are preferably hydroxyl groups, carbonyl groups, carboxyl groups, amino groups, amido groups or combinations thereof. A second rubber layer is also provided on the canvas surface that is opposite the first rubber layer, and the second rubber layer should comprise mainly a thermoplastic polyurethane.

Description

Conveyor belt

The present invention relates to a conveyor belt.

The transport belt is widely used for transporting raw materials such as luxury goods, intermediate products, products, etc., and is usually composed of a laminate including a resin layer and a canvas layer. As the material for the resin layer, polycarbonate polyurethane having excellent strength and wear resistance is generally used. In this polycarbonate-based polyurethane conveyor belt, the surface of the conveyor belt made of a resin layer is contaminated or denatured when transporting sticky conveyed items such as bread dough, confectionery dough, and cooked rice. There is an inconvenience such as. For this reason, conventionally, for example, a transport belt in which the non-adhesiveness of a transported object is improved by coating polytetrafluoroethylene resin (PTFE) as a fluororesin layer is disclosed (Japanese Patent Laid-Open No. 2013-28059) reference).

JP 2013-28059 A

However, the conveying belt formed with a coating made of PTFE has a high rigidity due to the influence of the film thickness, which is not desirable in terms of application to a belt conveyor having a small pulley diameter used for the folded portion. Also, the smaller the pulley diameter of the belt conveyor, the greater the stress due to the bending of the conveyor belt, and the coating layer on the outermost surface of the conveyor belt tends to peel off.

The present invention has been made based on the circumstances as described above, and an object of the present invention is to provide a conveyance belt that is excellent in non-adhesiveness of a conveyed product and can suppress peeling of a coating layer while suppressing rigidity. There is to do.

The invention made in order to solve the above-mentioned problems is a conveyor belt having a canvas as a core, laminated on one surface of the canvas, and a first rubber layer mainly composed of polycarbonate polyurethane, and A first rubber layer that is laminated on a surface opposite to the canvas and includes a coating layer mainly composed of a tetrafluoroethylene-hexafluoropropylene copolymer, and the coating layer is bonded to the first rubber layer. A conveying belt having a surface modifying group on its surface.

The conveyance belt has a coating layer mainly composed of a tetrafluoroethylene-hexafluoropropylene copolymer as an outermost layer, and is thus excellent in non-adhesiveness of the conveyed product. Since the first rubber layer mainly composed of polycarbonate polyurethane is laminated on one surface of the canvas, the tetrafluoroethylene-hexafluoropropylene copolymer laminated on the surface of the first rubber layer opposite to the canvas is laminated. Adhesiveness with a coating layer containing a polymer as a main component is improved. Further, the heat resistance of the first rubber layer is improved by using polycarbonate-based polyurethane as a main component. Furthermore, since the said coating layer has a surface modification group in the adhesive surface with the said 1st rubber layer, the adhesiveness of the said coating layer and a 1st rubber layer can be improved. Here, the “main component” refers to a component having the highest content, and usually refers to a component of 50% by mass or more, preferably 70% by mass or more, more preferably 90% by mass or more.

The average thickness of the coating layer is preferably 50 μm or less. When the average thickness of the coating layer is 50 μm or less, the rigidity of the conveyor belt can be suppressed.

The surface modifying group is preferably a hydroxyl group, a carbonyl group, a carboxyl group, an amino group, an amide group, or a combination thereof. When the surface modifying group is any of these groups, the adhesion between the coating layer and the first rubber layer can be further improved.

It is preferable that the canvas further includes a second rubber layer laminated on a surface opposite to the first rubber layer, and the second rubber layer is mainly composed of thermoplastic polyurethane. By providing the transport belt with the second rubber layer, it is possible to suppress warping of the transport belt while suppressing rigidity.

The canvas is composed of warp yarns arranged in the longitudinal direction and weft yarns intersecting with the warp yarns, and the thickness of the weft yarns is preferably 1780 dtex or more and 2890 dtex or less. When the thickness of the weft of the canvas is within the above range, warping of the conveyor belt can be suppressed.

Here, the “conveying belt” is a concept including not only an endless shape but also an endless shape. The “outer surface” means a conveying surface, and in the case of an endless conveying belt, it means an outer surface.

The conveyance belt of the present invention is excellent in non-adhesiveness of the conveyed product and can suppress peeling of the coating layer while suppressing rigidity.

It is the typical longitudinal cross-sectional view cut | disconnected by the surface along the longitudinal direction of the conveyance belt which concerns on 1st Embodiment of this invention. It is a figure for demonstrating the non-adhesive evaluation method of a conveyed product.

Hereinafter, an embodiment of a conveyor belt according to the present invention will be described in detail with reference to the drawings.

<First Embodiment>
[Conveyor belt]
FIG. 1 is a schematic cross-sectional view of a conveyor belt 1 according to the first embodiment of the present invention. The conveyor belt 1 has a canvas 5 as a core. The conveyor belt 1 includes a canvas 5, a first rubber layer 4 laminated on one surface of the canvas 5, and a coating layer 2 laminated on the surface of the first rubber layer 4 opposite to the canvas 5. Prepare. In the conveyor belt 1, the coating layer 2 is the outermost layer. A second rubber layer 6 is laminated on the surface of the canvas 5 opposite to the first rubber layer 4.

The conveying belt 1 rotates while interlocking with the pulley by a driving mechanism (not shown) so that the coating layer 2 is on the outside. Accordingly, the outer surface of the coating layer 2 becomes the transport surface.

(Canvas)
The conveyor belt 1 has a canvas 5 as a core. The canvas 5 holds tension applied to the transport belt 1 and gives mechanical strength to the transport belt 1.

The canvas 5 is a woven fabric composed of warps 10 arranged in the longitudinal direction indicated by the X direction in FIG. 1 and wefts 11 intersecting with the warps. There are no particular limitations on the type of yarn that constitutes the warp 10 and the weft 11, but examples include polyester yarn, nylon yarn, cotton yarn, rayon yarn, and the like. The yarn constituting the canvas 5 is preferably a polyester yarn because it is excellent in strength and flexibility, has good dimensional stability, and does not generate toxic gases such as nitrogen oxides during combustion. Further, the woven structure of the canvas 5 is not particularly limited.

The lower limit of the thickness of the weft 11 is preferably 1500 dtex, more preferably 1780 dtex. When the lower limit of the thickness is within the above range, warping of the conveying belt 1 can be suppressed. On the other hand, the upper limit of the thickness of the weft 11 is preferably 3000 dtex, more preferably 2890 dtex. When the upper limit of the thickness is within the above range, the rigidity of the conveyor belt 1 can be suppressed.

The lower limit of the thickness of the warp 10 is preferably 280 dtex, more preferably 560 dtex. When the lower limit of the thickness is within the above range, the strength of the conveyor belt 1 can be improved. On the other hand, the upper limit of the thickness of the warp 10 is preferably 2200 dtex, more preferably 1100 dtex. When the upper limit of the thickness is within the above range, the rigidity of the conveyor belt 1 can be suppressed.

In order to improve the adhesion to the first rubber layer 4, the canvas 5 may be subjected to a primer treatment impregnated with, for example, a urethane resin adhesive solution.

The lower limit of the average thickness of the canvas 5 is preferably 0.1 mm, and more preferably 0.3 mm. The upper limit of the average thickness is preferably 1 mm, and more preferably 0.8 mm. When the average thickness of the canvas 5 is within the above range, the rigidity of the conveyor belt 1 can be suppressed.

(First rubber layer)
The first rubber layer 4 is mainly composed of polycarbonate-based polyurethane. By using polycarbonate-based polyurethane as a main component, it is possible to improve the heat and moisture resistance, chemical resistance, mechanical properties and the like of the conveyor belt 1. Moreover, the adhesiveness with the coating layer laminated | stacked on one surface of the 1st rubber layer 4 improves.

The first rubber layer 4 may contain other resins such as ether polyurethane and caprolactone polyurethane in addition to polycarbonate polyurethane, if necessary. The first rubber layer 4 also contains known additives such as antioxidants, light stabilizers, ultraviolet absorbers, hydrolysis inhibitors, antibacterial agents, and fungicides added to polycarbonate polyurethane for belts. It may be.

As the polycarbonate-based polyurethane, known ones can be used. Although the manufacturing method of polycarbonate-type polyurethane is not specifically limited, Typically, the method of making an isocyanate compound and a polycarbonate diol compound react is mentioned.

Examples of the isocyanate compound include phenylene diisocyanate, 1,5-naphthalene diisocyanate (NDI), tolylene diisocyanate (TDI), 4,4′-diphenyl diisocyanate, diphenylmethane diisocyanate (MDI), and 4,4′-tolidine diisocyanate (TODI). Aromatic diisocyanates such as 4,4′-diphenyl ether diisocyanate, xylylene diisocyanate (XDI), tetramethylxylylene diisocyanate (TMXDI);
Cyclopentane diisocyanate, cyclohexane diisocyanate, isophorone diisocyanate (IPDI), dicyclohexylmethane diisocyanate (hydrogenated MDI), methyl-2,4-cyclohexanediisocyanate, methyl-2,6-cyclohexanediisocyanate, bis (isocyanatemethyl) cyclohexane, etc. Group diisocyanates;
Examples thereof include aliphatic diisocyanates such as hexamethylene diisocyanate (HDI), pentamethylene diisocyanate, and trimethylhexamethylene diisocyanate. These isocyanate compounds can be used alone or in combination of two or more.

Other than the above polyurethane resins, examples of the other resin include polyolefin, polycycloolefin, polydiene, polystyrene, styrene copolymer, acrylic resin, polyester, polyamide, thermosetting polyurethane, polyvinyl chloride, and the like.

The lower limit of the average thickness of the first rubber layer 4 is preferably 0.1 mm, and more preferably 0.4 mm. When the average thickness of the 1st rubber layer 4 is less than the said minimum, there exists a possibility that the outstanding intensity | strength of the belt 1 for conveyance may not be obtained. On the other hand, the upper limit of the average thickness of the first rubber layer 4 is preferably 1 mm, and more preferably 0.7 mm. When the average thickness of the first rubber layer 4 exceeds the above upper limit, the rigidity becomes high, and it may be difficult to use for a conveying device having a small pulley diameter.

(Second rubber layer)
The second rubber layer 6 is laminated on the surface of the canvas 5 opposite to the first rubber layer 4. The coating layer 2 has a large shrinkage stress due to heat at the time of manufacture, and the conveyor belt 1 is likely to warp. Since the conveyance belt 1 includes the second rubber layer 6, warping of the conveyance belt 1 can be suppressed. The second rubber layer 6 is mainly composed of thermoplastic polyurethane. In addition to the thermoplastic polyurethane, the second rubber layer 6 may contain other resins as necessary, and may contain a known additive added to the thermoplastic polyurethane for belts. .

As the thermoplastic polyurethane, known ones can be used. Examples of the thermoplastic polyurethane include, in addition to the polycarbonate-based polyurethane similar to the first rubber layer 4, polyester-based polyurethane, polyether-based polyurethane, polyolefin-based polyurethane, and the like. The method for producing the thermoplastic polyurethane is not particularly limited, but typically, as with the polycarbonate-based polyurethane, typically, approximately equimolar polyisocyanate compound and polyol compound, and chain extender are reacted at 60 ° C. or higher and 220 ° C. or lower, for example. Is mentioned.

Examples of the polyol compound include polyester polyols, polyether polyols, polyolefin polyols and the like in addition to the above-described diol polycarbonate polyols. These polyol components can be used alone or in combination of two or more.

Examples of the polyester polyol include at least one selected from aromatic dicarboxylic acids such as isophthalic acid and terephthalic acid or dialkyl esters thereof; aliphatic dicarboxylic acids such as adipic acid, glutaric acid and succinic acid, or dialkyl esters thereof. Species of dicarboxylic acids or their dialkyl esters;
C _2-10 alkanediols such as ethylene glycol, propylene glycol, trimethylene glycol, 1,3-butanediol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol; di- or tri-C such as diethylene glycol And a reaction product with at least one alkanediol component selected from _2-10 alkanediols.

Specific examples of polyester polyols based on adipic acid as a dicarboxylic acid component include polyethylene adipate (PEA), polydiethylene adipate (PDA), polypropylene adipate (PPA), polytetramethylene adipate (PBA), Examples thereof include polyhexamethylene adipate (PHMA) and a copolymer obtained by combining these components. Polyester polyols also include homopolymers or copolymers of lactones (C _3-14 lactones such as ε-caprolactone, δ-valerolactone, β-methyl-δ-valerolactone).

Examples of polyether polyols include homopolymers or copolymers of alkylene oxides such as ethylene oxide, propylene oxide, butylene oxide, tetrahydrofuran, and 3-methyltetrahydrofuran;
A homo- or copolymer comprising tetramethylene ether glycol;
An alkylene oxide adduct of bisphenol A or hydrogenated bisphenol A such as an adduct obtained by adding 1 to 5 moles of C _2-4 alkylene oxide to a hydroxy group can be used.

Examples of the polyolefin-based polyol include polybutadiene polyol, hydrogenated polybutadiene polyol, polyisoprene polyol, castor oil-modified polyol, and those obtained by introducing a hydroxyl group at the terminal of a copolymer of butadiene and styrene or acrylonitrile.

Among these polyol compounds, polycarbonate polyols are more preferable from the viewpoint of improving heat resistance.

The lower limit of the average thickness of the second rubber layer 6 is preferably 0.1 mm, and more preferably 0.3 mm. When the average thickness is less than the lower limit, there is a possibility that the warp of the conveying belt 1 cannot be suppressed. On the other hand, the upper limit of the average thickness of the second rubber layer 6 is preferably 1 mm, and more preferably 0.8 mm. When the average thickness exceeds the upper limit, the rigidity becomes high, and it may be difficult to use the transfer apparatus with a small pulley diameter.

(Coating layer)
The covering layer 2 has a function of protecting the surface of the conveying belt 1. The coating layer 2 is mainly composed of tetrafluoroethylene-hexafluoropropylene copolymer (FEP). When the coating layer 2 is mainly composed of FEP, the non-adhesiveness of the conveyed product is excellent.

The coating layer 2 has a surface modifying group on the adhesive surface with the first rubber layer 4. Since the coating layer 2 has the surface modification group on the adhesive surface with the first rubber layer 4, adhesion between the coating layer 2 and the first rubber layer 4 can be improved. As the surface modifying group, a hydroxyl group, a carbonyl group, a carboxyl group, an amino group, an amide group, or a combination thereof is preferable. When the surface modifying group is any of these groups, the adhesion between the coating layer 2 and the first rubber layer 4 can be further improved.

The surface-modifying group may be obtained by any treatment such as physical treatment such as plasma treatment or chemical treatment such as chemical etching. Among these, surface modification by plasma treatment is preferred from the viewpoint of adhesion. Groups are preferred.

As the FEP, as a commercial product, for example, NEOFRON FEP film B-1 can be used as a trade name of Daikin Industries.

The upper limit of the average thickness of the coating layer 2 is preferably 100 μm, and more preferably 50 μm. When the average thickness of the coating layer 2 exceeds the above upper limit, the rigidity of the conveyor belt 1 may be too high. On the other hand, the lower limit of the average thickness of the coating layer 2 is preferably 14 μm, more preferably 25 μm. When the average thickness of the coating layer 2 is less than the above lower limit, the coating layer may be easily broken.

Since the conveyor belt 1 has the above characteristics, it can be suitably used as a conveyor belt for a belt conveyor having a small pulley diameter. Moreover, the said conveyor belt 1 can be used suitably also for conveyance of food etc. with much moisture and adhesiveness.

[Conveying belt manufacturing method]
Hereinafter, an example of the manufacturing method of the conveyance belt according to the first embodiment will be described. The manufacturing method of the conveyor belt is not particularly limited,
(1) Rubber layer lamination step (2) A coating layer lamination step is provided. Hereinafter, each step will be described.

(Rubber layer lamination process)
In the rubber layer lamination step, the first rubber layer and the second rubber layer are laminated on the canvas. In this step, the first rubber layer is laminated on one surface of the canvas by extrusion molding. The canvas is preliminarily treated with a primer that is impregnated with a urethane resin adhesive solution. As the extrusion molding method, an extrusion lamination method is preferable from the viewpoints of quality stability and cost. Specifically, a resin composition for a first rubber layer containing polycarbonate-based polyurethane as a main component is laminated with a canvas while extruding with a T-die, and the first rubber layer is laminated on the canvas. In extrusion molding, the heating temperature is, for example, in the range of 160 ° C. or higher and 220 ° C. or lower. Next, a second rubber layer is laminated on the surface of the canvas opposite to the first rubber layer in the same manner as the first rubber layer.

(Coating layer lamination process)
In the covering layer stacking step, the covering layer is stacked on the surface of the laminate obtained in the rubber layer stacking step on the side opposite to the canvas of the first rubber layer. Lamination of the coating layer is performed by thermocompression bonding the above-mentioned laminate and a film for coating layer containing FEP as a main component and having a surface modification group by plasma treatment. In the said thermocompression bonding, thermocompression bonding is performed so that the surface which has the surface modification group of the film for coating layers turns into an adhesive surface with a 1st rubber layer. For the thermocompression bonding, for example, a continuous compression molding machine using rotocure is used. In this way, the coating layer film is laminated on the surface of the laminate for forming the substrate. As a pressurizing condition in the rotocuring, for example, 10 kg / cm ² or more and 100 kg / cm ² can be set.

Next, the laminate on which the coating layers are laminated is cooled. Examples of the cooling method include air cooling and water cooling. Although there are no particular limitations on the cooling temperature and time conditions, examples of the setting conditions include conditions under which the internal temperature of the formed laminate can be cooled to 10 ° C. or higher and 40 ° C. or lower.

The conveying belt can be formed into an endless conveying belt by cutting the laminated belt into a predetermined size and then joining the end portions of the laminate by joint processing. For example, a urethane-based adhesive can be used as the adhesive at the joining portion. As the joint processing, for example, a lap joint method, a finger joint method, a double finger joint method, or the like can be used.

[Other Embodiments]
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is not limited to the configuration of the above-described embodiment, but is defined by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims. The

Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to the following examples.

[Examples 1 to 6 and Comparative Examples 1 to 7]
For Examples 1 to 6 and Comparative Examples 1 to 7, transport belts containing the coating layer forming resin shown in Table 1 and the first rubber layer and the second rubber layer forming polyurethane as materials were prepared. In Examples 1 to 6 and Comparative Examples 1 to 7, transport belts were produced based on the above-described transport belt manufacturing method. First, polyurethane, which is a first rubber layer forming composition, was melt-extruded into a thin film to form a laminate for forming a substrate by extrusion lamination. Next, the laminate for forming the substrate and the coating layer film mainly composed of the fluororesin for forming the coating layer were thermocompression-bonded at 155 ° C. by rotocure and then cooled. Next, the polyurethane, which is the composition for forming the second rubber layer, is pressed into contact with the surface of the laminate on the side opposite to the first rubber layer by an extrusion lamination method while being melt-extruded in the form of a thin film. As a result, a laminate was formed. A transport belt having an average thickness of the first rubber layer of 0.3 mm, an average thickness of the canvas of 0.6 mm, and an average thickness of the second rubber layer of 0.5 mm was produced.

(Coating layer)
Examples of the resin for forming the coating layer include FEP (tetrafluoroethylene-hexafluoropropylene copolymer), PTFE (polytetrafluoroethylene), and a functional group-containing FEP film by plasma treatment. As a functional group-containing PTFE film by chemical etching, Yodoflon PTFE single-sided surface-treated film of Yodogawa Hutech was used.

(First rubber layer)
As polyurethane for forming the first rubber layer, polycarbonate-based polyurethane (Milaclan E985PTFO manufactured by Tosoh Corporation) or polyether-based polyurethane (Milactolan E385MTGA manufactured by Tosoh Corporation) was used.

(Canvas)
As the canvas, a fabric woven with warp yarns of polyester short fibers and weft yarns of polyester monofilament yarns was used. The warp yarn was a 20th double twist, and the thickness of the weft yarn is shown in Table 1.

(Second rubber layer)
As the polyurethane for forming the second rubber layer, polycarbonate-based polyurethane (Milactolan E985PTFO manufactured by Tosoh Corporation) was used.

<Evaluation>
For Examples 1 to 6 and Comparative Examples 1 to 7 obtained as described above, adhesion, bending rigidity, coating layer adhesion, warpage, and adaptability to small pulleys were evaluated. The evaluation results are shown in Table 1 below. Note that “-” in the table indicates that there is no corresponding configuration.

(Adhesiveness)
500 g of flour, 50 g of sugar, and 300 g of water were mixed, and the dough that had been sufficiently kneaded was placed directly on a predetermined range on the conveyor belt and left for 3 days to solidify to some extent. Next, the dough was peeled off, and the amount of adhesion was scored in 11 stages by visual judgment. As a reference, 10 points were given when none remained, and 0 points were given with almost no peeling. FIG. 2 shows reference examples (a) to (f) of the adhesion amount. It can be evaluated that 7 points or more are good, 6 points are slightly good, and 5 points or less are bad.

(Bending rigidity)
The bending rigidity was evaluated by deforming a belt having a ring shape with a width of 25 mm and a length of 150 mm as a test piece to a height close to the size of the applicable pulley diameter, and measuring the load at that time. When the measured load value is less than 250 g, which is applicable to a small pulley with a diameter of 30 mm, the small pulley is applicable, and when it is 250 g or more, it is not applicable.

(Coating layer adhesion)
Durability was evaluated by performing a 180 degree peel test in accordance with JIS K6854-2 (1999) peel adhesion strength test method and observing the peeled state between the coating layer and the rubber layer. An autograph was used as a measuring instrument, and measurement was performed under conditions of a peeling rate of 50 mm / min and a measurement width of 25 mm.
The case where the coating layer was torn without causing the coating layer to peel off due to the high adhesion of the coating layer was defined as “good”. On the other hand, the case where the film peeled easily due to the low adhesion of the coating layer was determined as “bad” and evaluated in two stages.

(warp)
The belt was placed on a flat surface, and the height (warpage) of the belt end from the horizontal plane was measured. When the warpage is less than 2 mm, it can be evaluated as A, when B is 2 mm or more and less than 20 mm, C when it is 20 mm or more and less than 40 mm, and D when it is 40 mm or more. A, B, and C are ranges that can be used as a conveyor belt.

As shown in Table 1, Examples 1 to 6 having a coating layer mainly composed of tetrafluoroethylene-hexafluoropropylene copolymer and a first rubber layer mainly composed of polycarbonate-based polyurethane are non-adhesive, The bending rigidity, the adhesion of the coating layer and the height of the warp were all good. In addition, in Example 6 in which the average thickness of the covering layer is less than 50 μm, the thickness of the weft yarn of the canvas is 1780 dtex or more and 2890 dtex or less, and the second rubber layer is provided, the rigidity is suppressed while manufacturing. The effect of suppressing the warp of the conveying belt due to the coating layer having a large shrinkage stress due to heat was excellent.

On the other hand, Comparative Example 1 including a coating layer having no surface modification group, Comparative Example 2 and Comparative Example 4 including a first rubber layer mainly composed of polyether-based polyurethane, The adhesion was poor. Further, Comparative Example 3 having no coating layer and Comparative Examples 5 to 7 having a coating layer made of PTFE were inferior to the Examples in non-adhesiveness. Furthermore, in Comparative Example 5, the thickness of the coating layer was 100 μm, so the bending rigidity was as high as 292 g. However, the thickness of the weft of the canvas was 1100 dtex, and the second rubber layer was not provided. Therefore, the effect of suppressing warpage was very poor.

According to the conveying belt of the present invention, the non-adhesiveness of the conveyed product is excellent, and since the peeling of the coating layer can be suppressed while suppressing the rigidity, it can be used for a belt conveyor having a small pulley diameter and has adhesiveness. It can be suitably used as a conveyor belt for food and the like.

DESCRIPTION OF SYMBOLS 1 Belt for conveyance 2 Coating layer 4 1st rubber layer 5 Canvas 6 2nd rubber layer 10 Warp 11 Weft

Claims

A transport belt having a canvas as a core,
A first rubber layer that is laminated on one surface of the canvas and is mainly composed of polycarbonate polyurethane;
The first rubber layer is laminated on a surface opposite to the canvas, and includes a coating layer mainly composed of a tetrafluoroethylene-hexafluoropropylene copolymer,
The conveyance belt in which the coating layer has a surface modification group on an adhesive surface with the first rubber layer.
The conveying belt according to claim 1, wherein the coating layer has an average thickness of 50 µm or less.
3. The conveyor belt according to claim 1, wherein the surface modifying group is a hydroxyl group, a carbonyl group, a carboxyl group, an amino group, an amide group, or a combination thereof.
A second rubber layer laminated on the surface of the canvas opposite to the first rubber layer;
The conveyance belt according to claim 1, wherein the second rubber layer has thermoplastic polyurethane as a main component.
The canvas is composed of warps arranged in the longitudinal direction and wefts intersecting with the warps,
The conveying belt according to any one of claims 1 to 4, wherein a thickness of the weft is 1780 dtex or more and 2890 dtex or less.