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Thermoplastic jacket belt

Inactive Publication Date: 2005-05-05
MARTIN DIETER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011] Another aspect of the present invention is to provide a belt having an ultra high molecular weight polyethylene thermoplastic film jacket having high abrasion resistance.
[0013] The invention comprises a belt having a body, a tensile member and an outer surface. The outer surface having belt teeth. Ultra high molecular weight polyethylene thermoplastic film (UHMWPE) is bonded to an outer load bearing surface. The outer surface comprises teeth in the preferred embodiment. The thermoplastic film bonded to the outer surface has a low softening point allowing it to comply with a mold shape prior to cure of the rubber body material. The UHMWPE film has a molecular weight in the range of 3-6 million grams per mole, although the range may be extended down to 250,000 grams per mole. The film exhibits superior abrasion resistance while reducing the cost per belt as compared to fabric jacket belts. The film jacket belt has significantly reduced dust and debris production during operation.

Problems solved by technology

During operation, the fabric reinforcement wears creating dust and debris particles.
The dust and debris is detrimental to the operation of adjacent components and may interfere with operation of certain types of equipment over time.
Depending upon the application, it is not desirable to have electrically conductive materials coating components in electrical equipment.
The outer film layer has very poor abrasion resistance.
The thermoplastic surface has low abrasion resistance and wears away during operation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0074] Nine layers of 3-mil (1.1 mm total thickness) Dartek EN560 polyamide 6,6 thermoplastic film layered together. The peak melt temperature is approximately 220° C. On top of the film layers is placed a 3 mm thick layer of EPDM, formulated as above except for 3.1 phr of Vanderbilt's Varox 130XL (2,5-dimethyl-2,5-di(t-butylperoxy)-3-hexyne) being substituted for the 4 phr of Vulcup. The peroxide raises the cure temperature of the belt body approximately 20° C., making it more suitable for use with the polyamide film. The materials and mold are placed in a mold under a pressure of 250 psi. The mold is brought to a temperature of approximately 210° C. to soften the film, form the teeth, and cure the body. Then the mold is cooled to 175° C. while maintaining pressure of 250 psi before removal. Cooling is performed to resolidify the thermoplastic film for better tooth shape retention. This is necessary with crystalline thermoplastic materials that have very sharp melting points and lo...

example 2

[0075] Eleven layers of 2.1-mil (0.9 mm total thickness) Dartek SF502 polyamide 6,6 thermoplastic film, having a peak melt temperature of 260° C., are placed in a mold with the modified EPDM body rubber as in Example 1. The materials and mold are placed in a bag mold under a pressure of 200 psi. The mold is brought to a temperature of approximately 240° C. as quickly as possible (about 8 minutes) to soften the film, form the teeth, and cure the body. Rapid heating is required to obtain good tooth formation before the body cures. Then the mold is cooled to 200° C. under pressure before the belt is removed. The resulting belt exhibits excellent tooth formation and adhesion, but with limited flexibility because of the brittleness of this polyamide film. It is expected that a total film thickness of 0.1 to 0.2 mm for this polyamide film would make a sufficiently flexible belt.

example 3

[0076] Twenty layers of 1-mil (1.2 mm total thickness) Capran 100 polyamide 6 thermoplastic film, having a peak melt temperature of 220° C., were placed in the mold with the body rubber as in Example 1 and 2. The materials and mold are placed in a bag mold under a pressure of 250 psi. The mold is brought to a temperature of approximately 210° C. to soften the film, form the teeth, and cure the body. Then the mold is cooled to 175° C. under pressure (250 psi) before removal.

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Abstract

A belt having a body, a tensile member and an outer surface. The body comprises an elastomer. An outer surface of the belt having a profile, foe example teeth. A layer of Ultra high molecular weight polyethylene thermoplastic (UHMWPE) is bonded to the profile surface. The layer bonded to the profile surface having a low softening point allowing it to conform to a mold shape prior to cure of the rubber body material. The layer having a molecular weight in the range of 3-7 million grams per mole. The layer causes the belt to exhibit superior abrasion resistance and flexibility while reducing the cost per belt as compared to fabric jacket belts. The UHMWPE jacket belt has significantly reduced dust and debris production during operation.

Description

REFERENCE TO RELATED APPLICATIONS [0001] This application is a divisional of U.S. non-provisional application Ser. No. 10 / 121,556 filed Apr. 12, 2002.FIELD OF THE INVENTION [0002] The invention relates to power transmission belts, more particularly, the invention relates to belts having a jacket comprising an ultra high molecular weight polyethylene thermoplastic layer. BACKGROUND OF THE INVENTION [0003] Toothed power transmission belts have a polymeric body such as a rubber, thermoplastic, or urethane, with a plurality of teeth or cogs formed along at least one side or both sides of such belts. A tensile member is typically embedded in the body as a tensile load-carrying member. [0004] It is preferred to have the belt teeth reinforced with a material to enhance their shear strength and wear-resistance, or to alter their coefficient of friction for engagement with a toothed pulley. The material generally comprises fabrics of a woven type such as a canvas, a crimped stretchable nylon...

Claims

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Application Information

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IPC IPC(8): F16G1/00B29D29/08B29K21/00B29K23/00F16G1/28F16G5/20
CPCB29D29/08B29K2023/0683F16G5/20F16G1/28B29K2223/0683
Inventor MARTIN, DIETERVISSER, HARRY D.DUNLAP, PAUL N.
Owner MARTIN DIETER
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