Abrasion-detection type conveyor belt and manufacturing method thereof

Abstract

Provided are an abrasion-detection type conveyor belt and a manufacturing method thereof. A polymer composition ratio of is set to 40-60% of styrene-butadiene rubber (SBR) and 60-40% of natural rubber (NR), and an adhesive strength between a cover rubber layer and an abrasion-detection color layer is set to 13 kN/m (33 kgf/inch). As compared to the existing product, material properties of the abrasion-detection color layer are improved to extend the available life of the abrasion detection type conveyor belt. The abrasion-detection type conveyor belt is cost-effective, simplifies a belt line, and reduces an inspection time.

Claims

1. An abrasion-detection type conveyor belt comprising: a cover rubber layer including a top cover rubber layer, an intermediate cover rubber layer, and a bottom cover rubber layer; carcasses inserted into the cover rubber layer, the carcasses having wavelike shapes; and an abrasion-detection-color layer disposed between the intermediate cover rubber layer and the top cover rubber layer, wherein the abrasion-detection color layer is formed by setting a polymer composition ratio to 40%-60% of styrene-butadiene (SBR) and 60%-40% of natural rubber (NR).

2. The abrasion-detection type conveyor belt according to claim 1, wherein an adhesive strength between the cover rubber layer and the abrasion-detection color layer is set to be more than or equal to 13 kN/m (33 kgf/inch).

3. The abrasion-detection type conveyor belt according to claim 1, wherein the abrasion-detection color layer has at least one of material properties selected from a hardness (Shore-A) of 59 to 61, an elongation rate of 610% to 700%, a tensile strength of 13.5 MPa to 14.0 MPa, a specific gravity of 1.36 g/cm.sup.3 to 1.46 g/cm.sup.3, and an abrasion amount of 300 mm.sup.3 to 320 mm.sup.3.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a perspective view of a conventional conveyor belt.

(2) FIG. 2 is a sectional view of the conventional conveyor belt.

(3) FIG. 3 is a sectional view of an abrasion-detection type conveyor belt according to the present invention.

(4) FIG. 4 is a flowchart of a method of manufacturing an abrasion-detection type conveyor belt according to the present invention.

(5) FIGS. 5 and 6 show test reports of Korean Conformity Laboratories.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

(6) Hereinafter, an abrasion-detection type conveyor belt and a manufacturing method thereof according to preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

(7) FIG. 3 is a sectional view of an abrasion-detection type conveyor belt according to the present invention, and FIG. 4 is a flowchart of a method of manufacturing an abrasion-detection type conveyor belt according to the present invention.

(8) Referring to FIGS. 3 and 4, an abrasion-detection type conveyor belt 100 according to a preferred embodiment of the present invention may has a structure in which a lower carcass 121, an intermediate cover rubber layer 112, an upper carcass 122, an abrasion-detection color layer 130, and a top cover rubber layer 113 are sequentially stacked on a bottom cover rubber layer 111. The bottom cover rubber layer 111, the intermediate cover rubber layer 112, and the top cover rubber layer 113 are collectively referred to as a cover rubber layer 110. The abrasion-detection color layer 130 may be set to a yellow color.

(9) In the abrasion-detection type conveyor belt, a polymer composition ratio of the abrasion-detection color layer 130 is set to 40-60% of styrene-butadiene rubber (SBR) and 60-40% of natural rubber (NR), an adhesive strength between the cover rubber layer 110 and the abrasion-detection color layer 130 is set to 13 kN/m (33 kgf/inch), and the material properties of the abrasion-detection color layer 130 are improved to thereby extend the available life of the abrasion-detection type conveyor belt.

(10) The method of manufacturing the abrasion-detection type conveyor belt according to the preferred embodiment of the present invention includes forming a cover rubber layer 110, carcasses 121 and 122 inserted into the cover rubber layer 130, and an abrasion-detection color layer 130 in the middle of the cover rubber layer 110, wherein the abrasion-detection color layer 130 is formed by setting a polymer composition ratio to 40-60% or SBR and 60-40% of NR.

(11) An adhesive strength between the cover rubber layer 110 and the abrasion-detection color layer 130 may be set to 13 kN/m (33 kgf/inch).

(12) Material properties of the abrasion-detection color layer 130 may have at least one selected from a hardness (Shore-A) of 59 to 61, an elongation rate of 610 to 700%, a tensile strength of 13.5 to 14.0 MPa, a specific gravity of 1.36 to 1.46 g/cm3, and an abrasion resistance (abrasion amount) of 300 to 320 mm.sup.3.

(13) FIGS. 5 and 6 show test reports of Korean Conformity Laboratories.

(14) It can be seen from FIGS. 5 and 6 that the material properties of the abrasion-detection color layer (color topping, yellow) formed by the manufacturing method according to the present invention are much more excellent than the conventional product (existing topping, black) in view of the test items of Table 1 below.

(15) TABLE-US-00001 Test result of Test result of present conventional Test item invention product Unit Specific gravity 1.46 1.37 Shore-A 61 62 Tensile strength 13.5 7.4 MPa Elongation rate 610 300 % Abrasion amount of cover rubber 319 418 mm.sup.3 Adhesive strength 16.10 7.10 kN/m (Upper Cover + Belting fabric) (average) Adhesive strength 15.87 7.05 kN/m (upper layer + Belting fabric) (Minimum value)

(16) As can be seen from Table 1 above, the abrasion-detection color layer (color topping, yellow) according to the present invention was similar to the conventional product (existing topping, black) in terms of the hardness and was higher in terms of the specific gravity, the tensile strength, the elongation rate, the abrasion amount, and the adhesive strength.

(17) It was confirmed that the abrasion-detection color layer (color topping, yellow) was more excellent than the conventional product (existing topping, black) in terms of the elongation rate, the tensile strength, the abrasion resistance (abrasion amount), and the adhesive strength, and the hardness and the specific gravity are appropriate without being excessively higher or lower.

(18) As described above, the polymer composition ratio of the abrasion-detection color layer is set to 40-60% of styrene-butadiene rubber (SBR) and 60-40% of natural rubber (NR), the adhesive strength between the cover rubber layer and the abrasion-detection color layer is set to 13 kN/m (33 kgf/inch), and the material properties of the abrasion-detection color layer are improved to thereby extend the available life of the conveyor belt.

(19) Since the material properties are remarkably improved and the available life of the conveyor belt is extended as compared to the conventional product, the conveyor belt according to the present invention is cost-effective, can simplify the belt line, and reduce an inspection time.

(20) While the embodiments of the present invention have been described with reference to the specific embodiments, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.

DESCRIPTION OF REFERENCE NUMERALS

(21) 100: abrasion-detection type conveyor belt 110: cover rubber layer 111: bottom cover rubber layer 112: intermediate cover rubber layer 113: top cover rubber layer 121: lower carcass 122: upper carcass 130: abrasion-detection color layer