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US 2004/0188878 A1Published application
Cell bursting method of a plastic foam sheets
OwnerChing Hsi Cheninventor
Life of this patent
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Abstract
A cell bursting method of a plastic foam sheet includes steps of producing a foam sheet and carrying on vacuum cell bursting to the foam sheet. In the process of the vacuum cell bursting, air in the cells of the foam sheet inflates to expand their cell walls to a preset extent, and the instant when normal pressure recovers, the cell walls burst instantly due to rapid releasing of pressure, able to produce a plastic foam sheet having high flexibility, good permeability and excellent elasticity.
Claims4
A cell bursting method of a plastic foam sheet comprising:
- (1). A first step of producing a foam sheet:
- a proper amount of plastic materials of ethylene vinyl acetate copolymer and polyethylene resins or their mixture mixed together with a blowing agent, a vulcanizing agent, a stabilizer and an aids agent of a preset proportion, said plastic material and all said agents mixed evenly and put in a mold for pressing and heating at a preset temperature and pressure, said mold opened to take out a foam sheet:
- and
- (2) A second step of carrying out vacuum cell-bursting:
- said foam sheet put in a closed vacuum chamber, said vacuum chamber connected with a vacuum device, said vacuum device pumping out air from said vacuum chamber to form a vacuum negative-pressure condition, air in the cells of said foam sheet accordingly inflating and expanding their outer circumferential solid walls to a preset extent, said expanded cell walls bursting through their fragile portions due to instant releasing of pressure when normal pressure recovers.
2 more elements
Dependencies are inferred from the claim text.