JP2002046837A - Conveyor belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conveyor belt with excellent physical properties, not generating noise during traveling. SOLUTION: This conveyor belt 1 includes composite canvas 3 as a core whose surface has a cover layer 2. The composite canvas 3 is formed by integrating a base fabric 4 with a base fabric 5 through an adhesive. The base fabric 4 is woven of both the warp composed of filament yarn of polyester fiber and the weft composed of monofilament yarn of polyester fiber, while the base fabric 5 uses spun yarn made of cotton fiber as the warp and the weft.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conveyor belt used for conveying articles and the like.

[0002]

2. Description of the Related Art Conventionally, a belt used for transporting articles is buried in a belt with a canvas as a core body to maintain and reinforce the belt shape. The canvas used is not limited to one layer, and two or more layers can be laminated, and is appropriately selected according to the belt application.

[0003] Conveyor belts are required to have some required performances. The main ones are excellent in bending resistance and high strength. The performance is affected by various factors such as the chemical composition of the canvas fiber, the form of the constituent yarns, the weaving composition and the like.Specifically, a woven fabric woven with a filament yarn and a monofilament yarn made of a synthetic fiber such as a nylon fiber is used. Is used.

[0004]

However, when a woven fabric composed of the above fibers is used on the back surface of the belt, there is a problem of noise generated when the belt runs. This noise is a rubbing sound generated when the pulley and the back surface of the belt come into contact with each other.The use of a soft spun yarn can suppress the rubbing noise, but the spun yarn has a lower strength than a filament yarn or a monofilament yarn. Therefore, there is a problem that the belt performance is reduced.

In recent years, belts have also been required to have high added functions with high functions and high performance in the industrial field. As a result of intensive studies based on the above background, the present applicant has found the present invention and proposed it.

[0006]

That is, according to the first aspect of the present invention, in a conveyor belt using a fiber base material for a core, the fiber base material is composed of (a) a synthetic fiber filament yarn or a monofilament yarn. A composite fabric in which a base fabric woven from warp and weft yarns and (b) two or more base fabrics which essentially include a base fabric containing at least a spun yarn in a constituent yarn,
And (b) a structure in which the base fabric is the back surface of the belt. Since the pulley surface of the composite canvas is composed of a (b) base cloth containing a soft spun yarn as a constituent yarn, noise generated during traveling can be prevented, and the composite canvas is woven with a filament yarn or a monofilament yarn. (A) Since the base fabric is used, the belt strength is not impaired.

According to a second aspect of the present invention, in the transport belt using a fiber base material for the core, the fiber base material comprises: (c) a warp composed of a filament yarn of a nylon fiber or a polyester fiber; and a nylon fiber or a polyester fiber. Composite fabric in which a base fabric woven with a weft composed of a monofilament yarn and a base fabric using at least a spun yarn made of a natural fiber or a flexible synthetic fiber as a warp are integrated via an adhesive. And (d) a structure in which the woven fabric is the back surface. Since the pulley surface of the composite canvas is made of the (d) base fabric including spun yarns of natural fibers and flexible fibers, it has a high effect of buffering the noise of rubbing with the pulleys and can suppress noise during traveling. In addition, since the composite canvas uses a high-strength (A) base fabric in which the warp is woven with a filament yarn and the weft is woven with a monofilament yarn, a high belt shape holding and reinforcing effect can be expected. Further, since both base fabrics are firmly compounded by the interposition of the adhesive, peeling between the base fabrics does not occur even during long-time running.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a sectional perspective view of a conveyor belt 1 according to the present invention. The transport belt 1 has a composite canvas 3 as a core, and a cover layer 2 is laminated on the surface thereof. The composite canvas 3 has a structure in which a base cloth 4 and a base cloth 5 are laminated and compounded. More specifically, the base cloth 4 has one surface on the cover layer 2,
The other surface adheres to the base cloth 5, and the base cloth 5
And the other surface is in contact with a pulley (not shown). In the conveyor belt, the number of plies of the base fabric serving as a core is appropriately selected according to the belt application. However, in the present invention, it is essential that the composite fabric includes a specific base fabric described below, and the three-ply When the above-mentioned base cloth is selected, it does not specify one or more plies of base cloth. That is, for example, when a 3-ply base fabric is used, the two-ply base fabrics are the base fabrics specified in the present invention, but the remaining one ply base fabric uses the same type of base fabric as the specified base fabric. Alternatively, a base fabric having another configuration may be used. Regarding the laminated structure, the order of lamination is not limited as long as a specific base cloth is the back surface.

The base fabric is a base fabric selected from woven fabric, knitted fabric, non-woven fabric and the like. However, the base cloth 4 is preferably a high-strength woven fabric because the base cloth 4 bears belt strength. Usually, the combination of the base cloth and the base cloth is performed by various methods such as a method of heat-sealing, bonding, and mechanically suturing with a thread such as a needle punch method or a stitch bond method. It is desirable to form a strong composite by a bonding process with an adhesive interposed. In particular,
After the melt-softened resin composition is pressed onto one of the base cloths, the resin composition is once cooled and then heated again to soften the resin composition. At this point, the other base cloth is attached to the base cloth. An adhesive method and the like in which an adhesive is applied to the surface and bonded are exemplified.
The method of applying the adhesive includes a doctor method, a roll method, an inversion method, a spray method, and a powder dispersion method. The adhesive used for the bonding process is not limited, and known and publicly-available ones can be used.
Adhesives such as urethane resins and ethylene-vinyl acetate copolymers are generally used, and among them, the use of urethane resins is preferable because of their excellent adhesion.

After the bonding treatment of the base cloth as described above, a pre-drying is performed by applying a constant load of pressure. The predrying conditions vary depending on the thickness and type of the base fabric,
It is preferable to carry out at 0 ° C. for about 5 to 10 minutes. After the completion of the preliminary drying, curing is performed. In the case of curing, it is preferable to perform heat treatment while pressing as described above.

As the fiber material constituting the base fabric, known and publicly usable ones can be used. For example, natural fibers such as cotton and hemp, inorganic fiber such as metal fiber and glass fiber, and polyamide, polyester, polyethylene, Examples include organic chemical fibers such as polyurethane, polystyrene, polyfluoroethylene, polyacryl, polyvinyl alcohol, wholly aromatic polyester, and aramid.

However, it is essential that the base cloth 4 and the base cloth 5 have at least the following conditions. Specifically, the cloth 4 is (A) a high-strength base cloth having excellent shape holding ability, and the base cloth 5 comes into contact with the pulley during traveling. It is necessary that the base fabric has excellent structure and that (B) the base fabric has a structure to be the back surface of the belt.

More specifically, the base fabric 4 may be made of known and used inorganic and organic chemical fibers as the raw material. Among them, polyester fibers and nylon fibers having high strength and good adhesion are used. Is preferably used.
The use of natural fibers is not preferable from the viewpoint of strength. Regarding the form of the fiber, a filament yarn or a monofilament yarn is preferably used because of its higher strength than a spun yarn. In addition, when using a monofilament yarn, it is preferable to use it for a weft in consideration of rigidity.

It is preferable that the base cloth 5 which comes into contact with the pulley has a structure exhibiting a noise damping effect during traveling. As the material, it is preferable to use flexible fibers such as natural fibers and flexible synthetic fibers, and specific examples include cotton fibers and polyester fibers. As a form of the fiber, a spun yarn is preferable. Further, the base cloth 5 may be configured to have a low surface friction coefficient. By lowering the surface friction coefficient, an effect of reducing the noise of rubbing with the pulley can be expected. Specifically, there is a method of manipulating the weaving composition so as to have a low density, using a fiber having a large diameter as a constituent yarn, or using a monofilament yarn to increase unevenness due to the intersection of a warp and a weft. . Incidentally, the monofilament yarn is preferably used for the weft in consideration of its rigidity.

It is preferable that the fiber base material 5 obtained as a composite be subjected to a dipping treatment and a coating treatment according to a known technique. The fiber base is immersed in a processing liquid (dip liquid) in which thermosetting urethane and isocyanate are dissolved in a solvent such as toluene and methyl ethyl ketone, and a coating liquid is laminated to a constant thickness to perform an adhesive treatment on the fiber base. The coating liquid is a processing liquid having substantially the same composition as the dip liquid, but has a higher proportion of thermosetting urethane and a higher viscosity than the dip liquid. When the cover layer is made of rubber, an adhesive treatment using only an RFL solution (resorcin-formalin-latex solution) may be performed as a dipping treatment. The RFL solution is obtained by mixing a latex with an initial condensate of resorcinol and formalin, and the latex used here is styrene, butadiene, vinylpyridine three-dimensional copolymer, chloroprene rubber, hydrogenated nitrile rubber, Latex such as sulfonated polyethylene and epochlorohydrin.

As the components used in the cover layer 4, known and publicly-known components can be used. For example, thermoplastic resins such as thermoplastic urethane, polyvinyl chloride and thermoplastic olefin, urethane rubber, ethylene propylene rubber, etc. Rubber and mixtures thereof are appropriately selected.

[0017]

The present invention will be described in more detail with reference to the following examples. Examples 1 and 2 and Comparative Examples 1 and 2 In Examples, a composite canvas obtained by compounding the plain woven fabric shown in Table 1 with a urethane-based resin by bonding was used as a dip treatment liquid (100 parts by weight of a thermosetting urethane resin, (Including 2 parts by weight of isocyanate).

A sample in which thermoplastic urethane is laminated as a cover material is manufactured, and a tensile test (sample shape J) according to JIS K6251 is performed to evaluate the mechanical properties of the sample.
IS No. 3 dumbbell). Next, a belt having a canvas structure as shown in Table 1 and a belt width of 100 mm and a belt circumference of 450 mm having the above-mentioned cover material was prepared, and the noise during belt running was measured using the belt. As a noise measurement method,
A belt was suspended on an aluminum pulley having a pulley diameter of φ100 mm so as to have a contact angle of 90 °. One end of the belt is fixed, and the other end has a belt tension of 0.9 k.
N / m load was applied and pulley speed was 100 m / m
The noise level generated during running under the condition of "in" was measured at a position 100 mm from the pulley. These results are also shown in Table 1.

[0019]

[Table 1]

From the above results, it can be understood that Examples 1 and 2 are transport belts having both high strength and low sound pressure level which are advantages of Comparative Examples 1 and 2.

[0021]

As described above, according to the invention as claimed in the present application, (A) a specific base cloth which maintains the belt strength and shape and (B) a specific base cloth excellent in soundproofing resistance are essential. And (B) a transport belt having a structure in which the base fabric is the back surface of the belt. The use of (B) the base fabric on the surface suppresses the generation of rubbing noise, and the use of the (A) base fabric in the composite canvas allows the transport belt to be excellent in belt performance such as strength and tension. Could be provided.

[Brief description of the drawings]

FIG. 1 is a sectional perspective view of a transport belt according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conveyor belt 2 Cover part 3 Composite canvas 4 Base cloth 5 Base cloth

Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (reference) D06M 17/00 LF term (reference) 3F024 AA01 BA01 CA04 CB03 CB09 CB14 4L032 AA05 AA07 AB02 AC01 AC02 BA03 BD01 DA00 EA06 4L048 AA08 AA20 AA24 AB01 AB07 AB10 BA02 CA01 DA38 EB00

Claims (2)

[Claims] In a conveyor belt using a fiber base material for a core, the fiber base material comprises: (a) a base fabric woven from a warp and a weft composed of a filament yarn or a monofilament yarn of a synthetic fiber; A composite canvas in which two or more base fabrics, each of which requires a base fabric containing at least a spun yarn as a constituent yarn, are integrated, and (b) the base fabric has a structure serving as a belt back surface. Conveyor belt. 2. A conveyor belt using a fiber base material for a core, wherein the fiber base material comprises (c) a warp yarn composed of a filament yarn of a nylon fiber or a polyester fiber and a monofilament yarn of a nylon fiber or a polyester fiber. A composite fabric in which a base fabric woven with the obtained weft and (d) a base fabric using at least a spun yarn of a natural fiber or a flexible synthetic fiber as a warp are integrated via an adhesive, and (D) A transport belt having a structure in which a woven fabric is a back surface.