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US 4,054,626 AGranted
Method for forming bodies of foamed plastisol resin
OwnerGerald D. Sjostrandinventor
Life of this patent
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Abstract
An improved method for forming bodies of foamed plastisol resin characterized by the steps of solidifying a flowable plastisol containing a chemical blowing agent to form a solidified body, grinding the body to form a body of uniformly sized aggregate, depositing the aggregate in a mold, and heating the mold to a temperature above that at which the plastisol fuses and the blowing agent decomposes.
Claims8
An improved method for forming a unitary body of foamed plastiscol resin comprising the steps of:
- A. heating a fluid plastisol containing a chemical blowing agent to form a solidified body;
- B. grinding the solidified body to form aggregate;
- C. depositing the aggregate in a mold cavity for a closed mold;
- and
- D. heating the aggregate within said mold cavity to a temperature above the temperature at which said blowing agent decomposes for thus causing the plastisol aggregate to expand and fuse into a unitary foamed body of substantially uniform density.
2 more elements
In an improved method for foaming a unitary body of foamed plastisol resin the steps comprising:
- A. heating fluid plastisol containing a chemical blowing agent to a temperature at which decomposition of the blowing agent is initiated for thus forming a solidified body consisting essentially of plastisol in its partially blown or expanded state;
- B. grinding the solidified body to form an aggregate;
- C. forming in a mold cavity of a closed mold a body of aggregate having air-filled interstices;
- and
- D. heating the body of aggregate within said cavity to a temperature at which te plastisol fuses and the blowing agent further decomposes for thus causing the aggregate to expand and fuse into a body of blown plastisol having a substantially uniform density.
2 more elements
Dependencies are inferred from the claim text.