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Celluloid-free table-tennis ball

A technology of table tennis and celluloid, applied in the field of table tennis, can solve the problems of high manufacturing cost, explosion hazard, difficult manufacturing, etc., and achieve the effect of easy processing

Inactive Publication Date: 2008-09-24
IN SOOK YOO INT PROJECT MANAGEMENT IPM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These disadvantages are: high manufacturing cost due to the use of large amounts of solvents, difficulty in manufacturing derivative products, explosion hazard
[0024] Therefore, no material similar to the motion characteristics of celluloid has been found so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Table tennis balls were fabricated from two injection molded PEI half-shells, which were joined with a polyvinyl butyral hot melt adhesive after plasma surface treatment.

Embodiment 2

[0054] The table tennis ball is manufactured from two injection-molded PET half-shells, which are joined with a reactive adhesive on an epoxy base after plasma surface treatment.

Embodiment 3

[0056] The table tennis ball is manufactured from two deep-drawn POM half-shells, which are joined with a reactive adhesive on an epoxy base after surface treatment.

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PUM

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Abstract

The invention is directed on the one hand to a celluloid-free table-tennis ball, preferably having a diameter of 38.5 to 48 mm, a weight of between 2.0 and 4.5 grams and a shell thickness (approximately) of between 0.20 mm and 1.30 mm, the shell being composed of plastic whose principal constituent is an organic, non-crosslinked polymer which in its main chain has not only carbon atoms but also heteroatoms; and on the other hand also to a method of manufacturing a table-tennis ball of this kind, where mostly in a first step two or more shell parts are manufactured, these shell parts being assembled in a subsequent step.

Description

technical field [0001] One aspect of the present invention relates to a celluloid-free table tennis ball preferably having a diameter of 38.5 to 48 mm, a weight between 2.0 and 4.5 g and a shell thickness (approximately) between 0.20 mm and 1.30 mm, wherein the shell consists of a synthetic material , the main component of which is an organic non-crosslinked polymer; and another aspect relates to a method for manufacturing the table tennis ball. Background technique [0002] Since about 1930, celluloid has been used as a material for table tennis balls in the world. But celluloid came with several important drawbacks. These disadvantages are: high manufacturing cost due to the use of large amounts of solvents, difficulty in manufacturing derivative products, explosion hazard. Due to these realities, celluloid is currently manufactured and processed almost exclusively in East Asian countries. Accidents are not uncommon in this regard. In the case of table tennis, this has...

Claims

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Application Information

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IPC IPC(8): A63B39/00
CPCA63B39/00Y10T428/1352
Inventor 柳仁淑托马斯·沃尔海姆
Owner IN SOOK YOO INT PROJECT MANAGEMENT IPM
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