Celluloid-free table-tennis ball

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...

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 deriva...