JPH04127712U - conveyor belt - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a resin conveyor belt that does not deform during use and performs its conveyance function without problems. [Configuration] Tensile modulus is 5,500 to 15,000 kg/cm ²
A conveyor comprising a polyester thermoplastic elastomer sheet 1 as a tensile strength body, and a urethane thermoplastic elastomer sheet 2 having a tensile modulus of 500 to 1000 kg/cm ² integrally laminated on the surface of the tensile strength body in contact with the pulley 4. This is belt 3.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a tree for transporting lightweight objects in food processing processes or precision equipment transport processes. Concerning improvements to fat conveyor belts.

0002

[Conventional technology]

Plastic conveyor belts use polyester canvas as the tensile strength material, and the surface The layer is made of polyurethane, PVC, etc., and the back layer reduces running resistance with the belt support. Constructed of polyester canvas to make it smaller, with exposed polyester canvas at the edges Belts with a cut edge structure were common. (hereinafter referred to as “conventional belt I”) cormorant) However, in conventional conveyor belts with a structure like Belt I, the belt during conveyance If the ends of the belt are rubbed during meandering, the polyester canvas of the tensile material may become frayed. Also, because the back side is always in contact with the belt support, This is a place where "tangling" is extremely likely to occur. However, the edges and back side of the belt are completely Because the area is difficult to clean, foreign matter tends to adhere to the ``frays'' and It also tends to become a breeding ground for bacteria. Such foreign matter contamination and bacteria are caused during the food processing process. This is highly disliked in the precision equipment transportation process.

0003 To solve this problem, we used polyester canvas as the tensile strength material. Made of polyester thermoplastic elastomer (hereinafter referred to as "TPEE") A conveyor belt is provided. For example, as TPEE, JP-A-48-29 There is one disclosed in Japanese Patent Publication No. 896, and one disclosed in Japanese Patent Application Laid-Open No. 1873-1983 A conveyor belt using E is disclosed. (hereinafter referred to as "Conventional Belt II") )

0004

[Problem that the idea aims to solve]

By the way, the pulleys used in conveyor belts are designed to improve the straightness of the belt. A crown (gentle arc-shaped part) is formed on the axial circumferential surface of the pulley to is common. However, conventional Belt II was manufactured by extrusion molding. Therefore, the stiffness in the width direction and length direction is almost the same, making polyester canvas a tensile strength material. Since it lacks flexibility compared to conventional belts I, adding tension to the belt will increase the The center of the belt may swell slightly during use due to stress concentration on the pulley crown. The belt may be deformed into a convex shape, or the end of the belt may be warped and deformed into a concave shape (curling). A failure occurs in the transmission function.

[0005] The present invention was made in view of these problems of the conventional technology. , its purpose is to use a plastic material that does not deform during use and performs its transport function without any problems. Our goal is to provide conveyor belts.

[0006]

[Means to solve the problem]

To achieve the above object, the gist of the present invention is to use TPEE having a tensile modulus of 5,500 to 1,500 kg/ ^cm2 as a tensile strength body, and to have a tensile modulus of 500 to 1,000 kg on one or both sides of the tensile strength body in contact with the pulley. The conveyor belt is made by laminating and integrating urethane-based thermoplastic elastomer (hereinafter referred to as "TPU") with a thickness of /cm ² .

[0007]

[Effect]

Adds tension to the belt as it has a highly flexible TPU layer on the pulley side of the belt. However, local stress concentration does not occur at the pulley crown, and the stress that occurs is distributed evenly over the entire belt width direction due to the effect of the TPU layer, and the convexity of the belt is Shape deformation and concave deformation are suppressed.

[0008]

【Example】

Examples and comparative examples according to the present invention will be described below.

(a) one or more dicarboxylic acids or ester-forming equivalents thereof having a molecular weight of less than 300; (b) one or more low molecular weight diols or ester-forming equivalents thereof having a molecular weight of 250 or less; and (c) TPEE consisting of one or more poly(alkylene oxide) glycols or their ester-forming equivalents having a molecular weight of 400 to 4000 and a carbon/oxygen ratio of 2.0 to 4.3 is added to conventional plastics. Extrusion molding was carried out using an extruder at a molding temperature of 210° C. to obtain a TPEE sheet 1 having a tensile modulus of 15,000 kg/cm ² or 5,500 kg/cm ² , a width of 300 mm, and a thickness of 2 mm. Then, on one or both sides of the obtained TPEE sheet 1, a TPU sheet 2 having a tensile modulus of 500 kg/cm ² or 1000 kg/cm ² , a width of 300 mm, and a thickness of 0.3 mm is extruded using the extruder described above. A two-layer sheet of TPEE/TPU or a three-layer sheet of TPU/TPEE/TPU was obtained by coating. (See FIGS. 1 and 2) On the other hand, using the extruder described above, sheets made only of TPEE with a tensile modulus of 15,000 kg/cm ² or 5,500 kg/cm ² , a width of 300 mm, and a thickness of 2 mm were also obtained.

0010 Next, these sheets were cut into 6.5 m lengths, the ends overlapped, and heat-pressed at 200°C. and produced eight types of endless conveyor belts. (Example 1 in Table 1 below) (See the conveyor belts in ~6 and the conveyor belts in Comparative Examples 1 and 2) Then, the conveyor belt 3 obtained in this way is shown in FIG. 3 (one-sided For those with a TPU sheet, make sure that the TPU side is the side that touches the pulley). Wrap it around pulleys 4 and 4 with a diameter of 100 mm and run at a speed of 40 m/min for 150 hours. I set it. Figure 4 shows a conveyor belt 3 having a TPU sheet 2 on the pulley surface side. 4. In the same figure, C is the crown of the pulley (1. 5mm), H indicates the degree of belt deformation. Deformation amount of this conveyor belt before and after running are shown in Table 1 below.

[0011]

[Table 1]

0012 As is clear from Table 1, the conveyor belt according to the present invention does not deform at all or The amount of deformation is extremely small. However, a comparative example conveyor belt made only of TPEE The amount of deformation at the tip is extremely large.

[0013]

[Effect of the idea]

This invention provides a conveyor belt that is difficult to deform and is extremely useful in practice. be able to.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a laminated sheet having TPU on one side of TPEE.

FIG. 2 is a cross-sectional view of a laminated sheet having TPU on both sides of TPEE.

FIG. 3 is a schematic side view of a conveyor belt wound around a pulley.

FIG. 4 is an enlarged sectional view of the pulley portion of the conveyor belt according to the present invention.

[Explanation of symbols]

1...TPEE sheet 2...TPU sheet 3...Conveyor belt 4...Pulley

Claims (1)

[Scope of utility model registration request] Claim 1: Tensile modulus is 5,500 to 15,000 kg/
A conveyor belt in which the tensile strength body is made of a polyester thermoplastic elastomer with a tensile strength of 500 to 1000 kg/cm 2 and a urethane thermoplastic elastomer with ^a tensile modulus of 500 to 1000 kg/cm ² is integrated on one or both sides of the tensile strength body in contact with the pulley.