JP2001019135A - Plame-resistant belt for article conveyance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimise the generation of a fire, the propagation of the fire, the generation of a noxious gas, and the like. SOLUTION: This flame-resistant belt for article conveyance includes a resin layer 2, a core body layer 1, and a laminate body 20 furnishing an adhesive layer 3 provided between the both layers, and the resin layer 2 is formed by mixing 10 to 67 pts.wt. of phosphatic cresil diphenyl, 18 to 33 pts.wt., favorable, to 1000 pts.wt. of polyurethane resin, and the adhesive layer 3 is formed by impregnating or coating a liquid body which is made by mixing 5 to 40 pts.wt. of a solid part with the composition same as the resin layer to a solvent including no harogen, 8 to 40 pts.wt. favorably, to the core body layer 1, and then volatilizing the solvant, while the core body layer 1 consists of a textile material including no harogen.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flame-retardant belt for transporting articles, and more particularly to an article-transporting conveyor installed at an airport, a post office, a truck terminal or the like where a large number of people or a large amount of goods gather. Outbreak of fire and propagation of flame,
The present invention relates to a flame-retardant belt which minimizes the generation of toxic gas due to high heat, gives the belt high flexibility, and minimizes the generation of heat due to friction or bending and stretching, and enables the use of a small-diameter pulley.

[0002]

2. Description of the Related Art Flame-retardant belts have been used in coal conveyor belts and the like to prevent the occurrence of fires caused by the article conveyor belt. For example,
Japanese Patent Application Laid-Open No. 2-2487 discloses a belt made of a front cover rubber layer, a canvas tensile member, and a back cover rubber layer in which flame retardancy is imparted by adding a halogenated polymer to the front and back cover rubber layers. Japanese Utility Model Publication No. Sho 62-22487 discloses a flame-retardant material in which a reinforcing layer in which short fibers are oriented perpendicular to the belt plane is attached to the back surface of the belt to reduce frictional heat when the drive pulley and the belt slip. A conveyor belt is disclosed.

Japanese Patent Application Laid-Open No. Hei 5-213504 discloses a technique for improving the durability and flame retardancy of a conductive seamless belt used in an electrophotographic copying machine or the like. In this publication, a seamless belt comprises a laminate having a thermoplastic resin layer containing carbon black and a flame retardant, and an outer thermoplastic resin layer containing carbon black but not containing a flame retardant. Have the desired values of surface conductivity and volume resistivity. Thermoplastic resins include polycarbonate, polyether amide copolymers, polyurethane copolymers and the like.
It is said that those consisting of seeds or mixtures thereof are used. It is said that the flame retardant is preferably composed of at least one selected from a halogen type or a phosphorus type or a mixture thereof. In this publication, a flame retardant is contained in a part of the belt layer for the purpose of improving a decrease in flame retardancy due to carbon black which needs to be added for imparting conductivity.

Japanese Patent Application Laid-Open No. 5-117517 discloses an intermediate transfer seamless belt made of a semiconductive flame-retardant resin composition used for an electrophotographic copying machine or the like. In this publication, the resin composition comprises 58 to 76 parts by weight of a thermoplastic aromatic polycarbonate, 4 to 39 parts by weight of a thermoplastic polyalkylene terephthalate, and 3 to 20 parts of acetylene black.
A flame retardant of 5 to 30 parts by weight and an antimony-containing compound of 3 to 30 parts by weight are blended with 100 parts by weight of the total.

[0005]

A conventional flame-retardant belt using a halogen-based flame retardant is flammable, but generates harmful gases such as chlorine gas under high heat and also generates highly toxic dioxin. There is a risk. When the belt contains antimony oxide as a flame retardant, the antimony oxide itself is a compound suspected of carcinogenicity, and the compound makes the resin hard and brittle, so that it cannot be used for a small-diameter pulley. An object of the present invention is to solve these conventional problems and to minimize the occurrence of fire, propagation of flame, and generation of toxic gas and the like due to high heat, particularly when used in an article transport conveyor in equipment that is vulnerable to heat and fire. The purpose of the present invention is to provide an improved flame retardant belt. In the present invention, the flame retardancy of the belt conforms to the standard of the flame retardancy test for the belt of ISO340.

Another object of the present invention is to provide a flame-retardant belt capable of using a small-diameter pulley by imparting flame retardancy and high flexibility to a conveyor belt. Still another object of the present invention is to provide an article conveying belt in which the entire belt including the belt joint and the belt accessories is provided with flame retardancy. Other objects, functions and effects of the present invention will be apparent from the following description and drawings.

[0007]

The flame retardant belt for conveying articles according to the present invention comprises a laminate having a resin layer, a core layer, and an adhesive layer disposed between both layers, wherein the resin layer is made of polyurethane. Cresyl diphenyl phosphate based on 100 parts by weight of resin
67 parts by weight, preferably 18 to 33 parts by weight, are kneaded and molded. The adhesive layer has a solid content of 5 to 40% by weight, preferably 8% by weight, in a solvent containing no halogen and having the same composition as the resin layer. The core material layer is impregnated or coated with a liquid material blended so as to have a concentration of about 25% by weight, and then the solvent is volatilized. The core material layer is made of a halogen-free fiber material. Cresyl diphenyl phosphate (phosphoric)
acid cresyl diphenyl est
er, CH ₃ C ₆ H ₄ O (C ₆ H ₅ O) ₂ PO) is represented by the following chemical structural formula.

Embedded image

The article-conveying flame retardant belt of the present invention preferably has the following configuration. (A) The laminate further includes a joint at the end. One form of joint consists of two ends of the laminate joined together as viewed from the surface of the laminate, the complementary fingers being located adjacent to each other with a slight gap from each other and the adhesive foil covering the adjacent fingers. (Z junction). The adhesive foil is made of a halogen-free resin kneaded with cresyl diphenyl phosphate, and the thickness of the fingers and adhesive foil is selected so that the joints have a thickness approximately the same as the rest of the laminate Is done. Another form of the joint portion is that, when viewed from the side of the laminate, the two ends of the laminate are each formed into a wedge shape that becomes thinner toward the tip, an adhesive is disposed between the two, and the two tips are overlapped. Then, pressure is applied in the thickness direction such that the total thickness becomes substantially equal to the thickness of the laminate, and the laminate is adhered (overlap adhesion). Also in this adhesive, a liquid having a composition similar to that of the resin layer and having a solid content of 5 to 40% by weight, preferably 8 to 25% by weight, is added to a solvent containing no halogen similarly to the belt adhesive layer. The body is used. The adhesive is applied to each of the two ends and then the solvent is volatilized, and then the two ends are superposed and adhered by applying pressure.

(B) It further includes a string-like contour material adhered along the edge of the laminate, and the string-like contour material is made of a resin containing no cresyl diphenyl phosphate and containing no halogen. (C) Further, a slip-prevention bar for preventing the article from slipping off the belt is adhered to the surface of the laminate at an interval in the moving direction of the belt, or is continuous with the surface of the laminate substantially parallel to the belt edge. This slide bar is made of a resin containing no cresyl diphenyl phosphate and containing no halogen. (D) A detachment prevention bar for preventing the belt from coming off the track is adhered to the back surface of the laminate, and the separation prevention bar is made of a resin containing no cresyl diphenyl phosphate and containing halogen. .

(E) The liquid material forming the adhesive layer further contains 5 to 30% by weight of the solid content of a crosslinking hardener. (F) The crosslinking curing agent is an aromatic isocyanate or an aliphatic isocyanate. (G) The polyurethane resin is obtained using an adipate-based, lactone-based, carbonate-based, or polyether-based polyol, and the solvent is dimethylformamide, toluene, methyl ethyl ketone, acetone, tetrahydrafuran, ethyl acetate. , Cyclohexanone, or dioxane, and the halogen-free fiber material is a polyester fiber or a polyamide fiber.

[0011]

The polyurethane resin of the transport belt of the present invention 10
A resin layer obtained by kneading and molding 10 to 67 parts by weight of cresyl diphenyl phosphate having high plasticity and flame retardancy in 0 parts by weight, and an adhesive layer containing cresyl diphenyl phosphate similarly to the resin layer are formed by a belt. The flexibility of the belt is not impaired, the flame retardancy of the belt is increased, and the flame retardancy conforming to the ISO 340 standard is generated. ISO 340 is a standard by the International Organization for Standardization, as described below. The high flexibility of the belt body reduces wasteful power for belt deformation around the pulleys, reduces fatigue of the belt material due to deformation, enables the use of small-diameter pulleys, and enables downsizing of transport equipment. To The belt of the present invention includes a halogen-free resin layer in which cresyl diphenyl phosphate is kneaded into a polyurethane resin, and since the core layer and the adhesive layer do not contain halogen, even when exposed to fire heat. , Highly toxic dioxins and halogen-based harmful gases
Does not occur. The adhesive layer made by mixing a flame retardant containing cresyl diphenyl phosphate as a main component in the adhesive has flame retardancy itself, and also has a flame retardant property in the core layer in contact with the adhesive layer. Give.

[0012] ISO340 is a standard by the International Standards Organization. FIG. 14 is a schematic layout diagram of an ISO 340 flame retardancy test apparatus. The burner 82 is driven by the fuel supplied from the fuel tank 80 to rotate the burner 82 at an angle R = 4 with respect to the horizontal direction.
A flame 84 is generated in the direction of 5 °. The flame length S is
The lower end of the test piece P is arranged at a distance T = 50 mm from the nozzle tip of the burner 82. FIG. 15A is a schematic plan view of the test piece P, FIG.
FIG. 5B is a schematic plan view showing a test piece cutting method. The test piece P has a length L = 200 mm and a width W
= 25 mm, and there are a warp direction test piece P1 and a weft direction test piece. Warp direction test piece P1
As shown in FIG. 15B, the long side (L) is adjusted to the warp direction of the belt C, that is, the direction of the belt running direction M, and the weft direction test piece P2 has the long side (L) In a direction perpendicular to the traveling direction of the vehicle.

In the present invention, the conveying belt is ISO 34
Whether or not to conform to the standard of 0 is determined by the following test. That is, the flame 84 of the burner 82 is applied to the test piece, then the burner is removed, and the time until the flame of the belt is extinguished is measured. A blow of 1.5 m / s is blown within 60 seconds ± 10 seconds after removing the burner, and it is checked whether there is any reignition. The test piece is cut in a strip shape from the belt, and there are a warp direction cut cut out along the longitudinal direction (warp direction) of the belt, and a weft cut cut out along the direction crossing the warp direction of the belt (weft direction). With respect to the belt with the cover layer and the cover layer-removed belt (exposed core), the cut in the warp direction and the cut in the weft direction are each performed for 3 pieces, and a total of 12 pieces are tested.
The passing criterion is for a group of 6 pieces on each belt,
The total burn time of the six pieces is less than 45 seconds, the burn time for each individual piece does not exceed 15 seconds, and does not reignite in the wind.

[0014] At the end bonded with an adhesive obtained by dissolving a halogen-free resin kneaded with cresyl diphenyl phosphate in a halogen-free solvent, the adhesive itself has flame retardancy. Therefore, the flame retardancy of the belt is not reduced. An adhesive foil made of a halogen-free resin kneaded with cresyl diphenyl phosphate coats the fingers at the end of the belt and renders the end of the belt non-flammable. A string-like profile made of a halogen-free resin kneaded with cresyl diphenyl phosphate protects the edge of the belt and renders the belt flame-retardant. The anti-slip bar made of halogen-free resin kneaded with cresyl diphenyl phosphate is adhered to the belt surface at intervals,
It prevents the conveyed articles from slipping down and is itself flame retardant and does not reduce the flame retardancy of the belt. The slip-off prevention bar made of a resin containing no halogen mixed with cresyl diphenyl phosphate is bonded to the back surface of the belt to prevent the belt from coming off the track. Does not reduce flame retardancy.

[0015]

FIG. 1 shows a flame-retardant belt for conveying articles according to a first embodiment of the present invention, which comprises a resin layer 2, a core layer 1, and an adhesive layer disposed between both layers. Laminate 20 including 3
It consists of. The resin layer 2 is made of polyurethane resin 10
Cresyl diphenyl phosphate (flame retardant) 1 per 0 parts by weight
0 to 67 parts by weight (the compounding amount of the flame retardant is 9 to
40% by weight), preferably 18 to 33 parts by weight (15
-25% by weight). The adhesive layer 3 has a solid content of 5 to 40% by weight, preferably 8 to 40% by weight, of a solid content (a mixture of cresyl diphenyl phosphate in a polyurethane resin) in a solvent containing no halogen in a solvent containing no halogen.
The core material layer is impregnated or coated with a liquid material blended at 25% by weight, and then the solvent is evaporated. The core layer 1 is made of a fiber material containing no halogen. The core layer 1 itself is a fibrous material having no flame retardancy, but is provided with a practical flame retardancy by being bonded and impregnated with a flame retardant adhesive.

FIGS. 2 to 4 show a second embodiment to a fourth embodiment of the present invention. The laminated body 20 of the flame-retardant belt of FIG. 1 includes a single resin layer 2, a core layer 1 and an adhesive layer 3, respectively. Any or all of the adhesive layers are plural. That is, in FIG. 2, resin layers 2, 2 disposed on both sides of the belt (front and back surfaces of the belt) are bonded to one core layer 1 at the center of the belt by adhesive layers 3, 3. The resin layers 2 and 2 and the adhesive layers 3 and 3 are made by kneading cresyl diphenyl phosphate with a polyurethane resin, as in the embodiment of FIG. The flame-retardant belt for transporting articles of the third embodiment shown in FIG. 3 has a structure in which another core layer 1 is adhered below the laminate of FIG. The flame retardant belt for transporting articles of the fourth embodiment shown in FIG. 4 has a structure in which another resin layer 2 is adhered below the laminate of FIG.

The test apparatus shown in FIG. 14 has a belt structure with a cover layer as shown in FIG. 1, and the resin layer 2 and the adhesive layer 3 are made of a flame-retardant polyurethane resin having the following composition. The flame retardant belt was tested according to ISO 340, and the results are as follows. Composition of resin layer Polyether-based polyurethane resin; 100 parts by weight Cresyl diphenyl phosphate; 28 parts by weight Composition of adhesive layer Polyether-based polyurethane resin; 100 parts by weight Cresyl diphenyl phosphate; 28 parts by weight 533 parts by weight of dimethylformamide Methyl ethyl ketone 406 parts by weight Ethyl acetate 5 parts by weight Aliphatic isocyanate 17 parts by weight Test results (A) Belt with cover layer Warp direction test piece Sample No. 1: 1 second, No. 2: 2 seconds, No. 3: 1 second weft direction test piece Sample No. 1: 1 second, No. 2: 2 seconds, No. 3: 1 second Total time: 8 seconds, average time: 1.3 seconds Judgment: Passed (no re-ignition) (B) Cover layer removal belt Warp direction test piece Sample No. 1: 2 seconds, No. 2: 1 second, No. 3: 1 second weft direction test piece Sample No. 1: 1 second, No. 2: 2 seconds, No. 3: 1 second Total time: 8 seconds, average time: 1.3 seconds Judgment: Passed (no reignition)

FIG. 5A is a plan view showing a joint 11 in one form (Z joint) for joining the ends of the laminate 20 constituting the belt, and FIG. 5B is an adhesive covering the surface of the joint 11. FIG. 3 is a plan view of the foil 4. When viewed from the front surface (or the back surface) of the laminate 20, the ends of the laminate 20 constituting the belt are provided with adjacent complementary fingers 5, 5 and fingers 6, with a slight gap therebetween. Be cut off. Fingers 5, 5, 6, 6, arranged adjacently,
Are covered and bonded by an adhesive foil 4. The adhesive foil 4 is made of a halogen-free resin into which cresyl diphenyl phosphate is kneaded. The total thickness of the finger and the adhesive foil is such that
0 is selected to have a similar thickness as the other parts, allowing smooth movement of the belt.

FIG. 6 is a schematic perspective view showing an overlap type joint which is another form of the belt joint. At the overlap joint, the two ends 41 and 42 of the stacked body to be joined as viewed from the side surface of the stacked body 20 are each formed into a wedge shape having a thinner tip, and an adhesive is disposed between the ends 41 and 42. Is done. As the adhesive, the above-described flame-retardant adhesive is used, and the ends 41 and 42 are overlapped so that the total thickness of the ends 41 and 42 is the same as the thickness of the laminate, and the pressure in the thickness direction is reduced. They are joined by being added.

FIG. 7 shows a belt in which a semi-cylindrical string-like contour material 15 is adhered to the edge 14 of the laminate 20. FIG.
This shows a cylindrical material having a shape in which two semi-cylindrical string-like contour members 15 are combined. After such a cylindrical material is formed, it is cut off along the axis of the material to form a semi-cylindrical string. The contour member 15 can be manufactured efficiently.
The cord-like contour material 15 is made of a resin containing no halogen mixed with cresyl diphenyl phosphate, and has flame retardancy. The string-like contour material 15 is adhered to the edge of the laminate 20 to protect the edge, and the flame retardancy of the laminate increases the flame retardancy of the entire belt.

FIG. 9 is a perspective view of a belt provided with the anti-slip ridge 24. Fig. 10 shows the slip prevention
FIG. 24 is a sectional view of FIG. The anti-slip ridge 24 is for preventing the conveyed object from slipping off from the surface 21 of the transport belt laminate 20 and is bonded to the laminate surface 21 at intervals as shown in FIG. Is done. Slip prevention bar 24
Is composed of a resin containing no halogen and kneaded with cresyl diphenyl phosphate, and has flame retardancy. The back surface of the laminated body 20 is engaged with and supported by the cylindrical surface of the pulley 32. As shown in FIG. 10, the anti-slip ridge 24 includes a relatively wide bottom surface 27 and a flat plate-shaped portion 25 having a substantially vertical or inclined shape. 24
Is fixed to the surface 21 of the laminated body 20 at the bottom surface 27 by welding or bonding. The cross-sectional shape of the anti-slip
It is made into various shapes depending on the application.

FIG. 11 is a perspective view of a belt in which corrugations 29 are attached to the surface of the laminate 20 along the edge 14 in order to prevent articles from slipping off the edge 14 of the belt. The corrugated bar 29 is made of a resin containing no halogen mixed with cresyl diphenyl phosphate, and has flame retardancy.

FIG. 12 is a perspective view of a belt provided with a slip-off prevention member 34, and FIG. 13 is a sectional view of the slip-off prevention member. Running surface (back surface) 22 of the laminate 20 constituting the belt
Is supported by the pulley 32 and moves around it. The slip-off prevention ridge 34 is extended and adhered to the running surface 22 in the belt moving direction, and is engaged with the outer circumferential recess 33 of the pulley 32 to prevent the belt from coming off the track. The detachment prevention bar 34 is made of a resin containing no halogen and kneaded with cresyl diphenyl phosphate, and has flame retardancy. As shown in FIG. 12, the slip-off prevention bar 34 has a relatively wide bottom surface 37 and a rib-like portion 35 extending substantially perpendicular to the bottom surface 37. The rib portion 35 is fixed to the back surface 22 of the multilayer body 20 by welding or bonding at the bottom surface 37. The cross-section of the detachment prevention bar 34, that is, the cross-section of the rib-like portion 35 is formed in various shapes depending on the application.

The adhesive layer 3 shown in FIG. 1 to FIG. 4 or FIG.
A solid content obtained by kneading cresyl diphenyl phosphate in a polyurethane resin is mixed with a halogen-free solvent in an amount of 5 to 40%.
% By weight, preferably 8 to 25% by weight, is impregnated or applied to the core layer.
It is formed by heating to 0 to 170 ° C. and volatilizing, and pressing and adhering the resin layer 2 to the solid content remaining on the core layer 1. As the solvent, dimethylformamide, toluene, methyl ethyl ketone, acetone, tetrahydrofuran, ethyl acetate, cyclohexanone, dioxane or the like is used. Since the flame-retardant polyurethane adhesive layer has a strong adhesive force and a high flexibility, no peeling or cracking occurs when the conveying belt is bent with a small pulley diameter.

Preferably, the liquid material that is the basis of the adhesive layer 3 further contains 5 to 30% by weight of solid content of a cross-linking curing agent. The crosslinking hardener improves the adhesive strength between the resin layer 2 and the core layer 1 and prevents separation between layers due to bending. The cross-linking curing agent blended in the liquid is an aromatic isocyanate or an aliphatic isocyanate. The aromatic isocyanate is, for example, a polyfunctional aromatic isocyanate, triisocyanate phenylthiophosphate, triphenylmethane triisocyanate, or the like. The aliphatic isocyanate is, for example, hexamethylene diisocyanate trimethylolpropane adduct type or the like.

The polyurethane resin constituting the flame-retardant belt is obtained by using a lactone-based, adipate-based, carbonate-based or polyether-based polyol. The halogen-free fiber material is a polyester fiber or a polyamide fiber.

[0027]

Since the flame retardant belt of the present invention does not use a halogen-based flame retardant, the generation of harmful gases such as chlorine gas under high heat is minimized, and there is no danger of producing highly toxic dioxin. Also, since the belt does not contain antimony oxide which is suspected of carcinogenicity, handling is safe. Also,
It is possible to prevent the resin of antimony oxide from becoming hard and brittle. INDUSTRIAL APPLICABILITY The flame retardant belt of the present invention can be used for an article conveying conveyor in equipment that is vulnerable to heat and fire, and can minimize the occurrence of fire, the propagation of flame, and the generation of toxic gas due to high heat. In the present invention, the flame retardancy of the belt is I
The performance conforms to the standards of the flame retardancy test for the SO340 belt.

The conveying flame-retardant belt of the present invention allows the use of a small-diameter pulley by imparting flame retardancy and also maintaining the flexibility of the polyurethane main body. The transportable flame retardant belt of the present invention imparts flame retardancy to the entire belt, including the belt joint and belt accessories. The high flexibility of the belt body reduces wasteful power for belt deformation around the pulleys, reduces fatigue of the belt material due to deformation, enables the use of small-diameter pulleys, and enables downsizing of transport equipment. To

Since the belt of the present invention is made by mixing a flame retardant containing cresyl diphenyl phosphate as a main component into the adhesive, the adhesive layer itself has flame retardancy and the adhesive layer has Flame retardancy is also imparted to the contacting core layer. An adhesive foil made of a halogen-free resin kneaded with cresyl diphenyl phosphate coats the fingers at the end of the belt and renders the end of the belt non-flammable. Flame retardancy is also provided by the flame retardant adhesive in the overlap bonding for joining the belt ends. A string-like profile made of a halogen-free resin kneaded with cresyl diphenyl phosphate protects the edge of the belt and imparts flame retardancy to the belt edge. The anti-slip bar made of a resin containing no halogen mixed with cresyl diphenyl phosphate is bonded to the belt surface at intervals to prevent the conveyed articles from slipping off and has flame retardancy itself. . Similarly, the corrugated crosspiece arranged parallel to the edge on the belt surface has flame retardancy because it is made of a resin containing no cresyl diphenyl phosphate and containing no halogen. The slip-off preventing bar made of a resin containing no cresyl diphenyl phosphate and containing no halogen is adhered to the back surface of the belt to prevent the belt from coming off the track, and has flame retardancy itself.

[Brief description of the drawings]

FIG. 1 is a sectional view of a flame retardant belt according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a flame retardant belt according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a flame retardant belt according to a third embodiment of the present invention.

FIG. 4 is a sectional view of a flame retardant belt according to a fourth embodiment of the present invention.

5A is a plan view showing a Z-shaped joint of the belt, and FIG. 5B is a plan view showing a joining foil for forming a Z-shaped joint of the belt.

FIG. 6 is a schematic perspective view showing an overlap-type joining portion of the belt.

7 is a partial cross-sectional perspective view of a belt in which a semi-cylindrical string-shaped contour member is welded to an edge of the belt of the embodiment of FIG. 4;

FIG. 8 is a cross-sectional view of a state where two semi-cylindrical string-shaped profile members are combined.

FIG. 9 is a perspective view of a belt provided with a slip-preventing stay.

FIG. 10 is a cross-sectional view of a slip-prevention housing.

FIG. 11 is a perspective view showing a belt provided with corrugations.

FIG. 12 is a perspective view of a belt provided with a detachment prevention member.

FIG. 13 is a sectional view of a detachment prevention member.

FIG. 14 is a schematic layout view of an ISO 340 test apparatus.

FIG. 15A is a plan view illustrating dimensions of a test piece, and FIG. 15B is a plan view illustrating cutout of the test piece.

[Explanation of symbols]

1: Core layer, 2: Resin layer, 3: Adhesive layer, 4: Adhesive foil, 14: Edge, 15: String-like contour material, 20: Laminate, 24: Anti-slip, 25: Flat portion , 27, 3
7: bottom surface, 29: corrugated member, 32: pulley, 34: detachment preventing member, 35: rib-shaped portion, 41, 42: wedge-shaped portion, 8
2: Burner. M: belt movement direction, P1, P2: test piece.

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] February 28, 2000 (200.2.2
8)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

Claims (9)

[Claims] 1. A flame-retardant belt for conveying articles, comprising a laminate having a resin layer, a core layer, and an adhesive layer disposed between both layers, wherein the resin layer has a polyurethane resin weight of 100%. 10 to 67 parts by weight, preferably 18 to 33 parts by weight, of cresyl diphenyl phosphate per part by weight, and the adhesive layer is made of a solvent containing no halogen and having a solid content similar to that of the resin layer. Is 5 to 40% by weight, preferably 8 to 25% by weight, in which the liquid is impregnated or applied to the core layer, and then the solvent is volatilized, and the core layer does not contain halogen. A flame-retardant belt comprising a fiber material. 2. The flame-retardant belt according to claim 1, further comprising a joint at an end of the laminate, wherein the joints are adjacent to each other with a slight gap as viewed from the surface of the laminate. The adhesive foil covers the finger of the shape and the finger arranged adjacently, the adhesive foil is made of a halogen-free resin kneaded with cresyl diphenyl phosphate, and the thickness of the finger and the adhesive foil is such that the joint is A flame-retardant belt, characterized in that it is selected to have a thickness similar to other parts of the laminate. 3. The flame-retardant belt according to claim 1, further comprising a joining portion at an end of the laminate, wherein the joining portion has two ends joined to each other as viewed from the side of the laminate toward the tip. The two end portions are joined by applying an adhesive between them and applying pressure in the thickness direction, and the thickness of the joined portion is approximately equal to the thickness of the other portion of the laminate. The flame retardant belt, wherein the adhesive is a liquid material obtained by dissolving a halogen-free resin kneaded with cresyl diphenyl phosphate in a halogen-free solvent. 4. The flame-retardant belt according to claim 1, further comprising a string-like contour material adhered over an edge of the laminate, wherein the string-like contour material is phosphorus-containing. A flame-retardant belt comprising a halogen-free resin kneaded with cresyl diphenyl acid. 5. The flame-retardant belt according to claim 1, further comprising a slip-prevention bar for preventing an article from slipping off the belt at a distance from the surface of the laminate. Or is continuously adhered to the surface of the laminate along the edge of the belt, and the anti-slip bar is made of a halogen-free resin kneaded with cresyl diphenyl phosphate. belt. 6. The flame-retardant belt according to claim 1, further comprising a detachment prevention bar for preventing the belt from coming off the track, on the back surface of the laminate, and the detachment prevention. The flame-retardant belt is made of a halogen-free resin kneaded with cresyl diphenyl phosphate. 7. The flame-retardant belt according to claim 1, wherein the liquid material forming the adhesive layer further contains 5 to 30% by weight of a solid content of a crosslinking hardener. Features a flame retardant belt. 8. The flame retardant belt according to claim 6, wherein the crosslinking curing agent is an aromatic isocyanate or an aliphatic isocyanate. 9. The flame-retardant belt according to claim 1, wherein the polyurethane resin is obtained by using an adipate-based, lactone-based, carbonate-based, or polyether-based polyol. Wherein the solvent is dimethylformamide, toluene, methyl ethyl ketone, acetone, tetrahydrafuran, ethyl acetate, cyclohexanone, or dioxane, and the halogen-free fiber material is a polyester fiber or a polyamide fiber. And flame retardant belt.