Injection-molded celluloid-free table tennis

Abstract

The invention relates to injection-molded celluloid-free table tennis, and belongs to the technical field of table tennis. The table tennis is characterized by being prepared from butadiene-styrene copolymer, acrylonitrile-butadiene-styrene copolymer, cellulose acetate and a coloring agent. A preparation method comprises the following steps of: (A) melting the butadiene-styrene copolymer, the acrylonitrile-butadiene-styrene copolymer, the cellulose acetate and the coloring agent at the temperature of 200 to 220 DEG C, and performing injection molding on the melted raw materials under the atmospheric pressure of 65 to 75; (B) forming hemispherical table tennis, and releasing from a hemispherical table tennis mold; (C) bonding two pieces of hemispherical table tennis to form the whole table tennis; (D) putting the whole table tennis into an expander for expanding; and (E) cleaning, grinding and polishing. The celluloid-free table tennis has a few potential safety hazards, can reach the international table tennis federation (ITTF) quality standard, and is short in preparation period and low in cost.

Description

technical field [0001] The invention belongs to the technical field of table tennis, and in particular relates to an injection-molded celluloid-free table tennis ball. Background technique [0002] Existing table tennis all adopts celluloid to be raw material to make, adopts celluloid to be that raw material is made table tennis to have following disadvantages: the one, celluloid is a kind of very flammable material, and it not only regards its storage, transportation process as raw material stage, production stage; There are flammable safety hazards in the table tennis ball, and there are also flammable safety hazards in the storage and transportation process after becoming a table tennis product. The second is to make table tennis balls with celluloid, which needs to be punched first, and the celluloid sheet has the disadvantage of uneven thickness, so it is relatively difficult to control its weight to make it meet the Tchnical Leaflet T3 standard of the International Tab...

AI Technical Summary

Problems solved by technology

[0002] Existing table tennis all adopts celluloid to be raw material to make, adopts celluloid to be that raw material is made table tennis to have following disadvantages: the one, celluloid is a kind of very flammable material, and it not only regards its storage, transportation process as raw material stage, production stage; There is a flammable safety hazard in the table tennis product, and there is also a flammable safety hazard during storage and transportation after becoming a table tennis product.

The second is to use celluloid to make table tennis balls, which need to be punched first, and the celluloid sheet has the disadvantage of uneven thickness, so it is relatively difficult to control its weight to meet the Tchnical Leaflet T3 standard of the ITTF

However, low-pressure polyethylene has poor aging resistance; and polystyrene is a brittle plastic. Although the brittleness of modified polystyrene has been improved, it is still not ideal; and polycarbonate has poor scratch resistance, so the above materials are used to make table tennis. The ball still has its limitations, in addition, its molding method makes its weight difficult to control

Another example is the patent application number: 200680034220.X, publication number: CN 101272830 "table tennis ball without celluloid", which only discloses the main components of making "table tennis ball without celluloid", and does not disclose the production of "table tennis ball without celluloid". "Ball" secondary components, and for a chemical product, not only the secondary components are very important, but also the different proportions of the same component are also very important, so this patent application has the disadvantage of insufficient disclosure, so there is no such ping-pong ball listing

Another example is patent application number: 90103206.9, publication number: CN 101850170A "Modified polystyrene table tennis" technical scheme, modified polystyrene is hips, and hips impact performance is relatively low in engineering plastics, and for table tennis The impact resistance of the ball is the most basic, so although the technical solution has been applied for a patent on June 26, 1990, it has not been adopted by people so far

There is also a patent application number: 200910038310.1, publication number: CN 101850170A "a table tennis ball with integral seamless structure". average problem