Plastic article or earthenware shaping or treating: apparatus – Shaping orifice and downstream work contacting gaseous...
Patent
1987-01-09
1988-06-14
Chiesa, Richard L.
Plastic article or earthenware shaping or treating: apparatus
Shaping orifice and downstream work contacting gaseous...
2642093, 264569, 4253261, 4253871, B29C 4788
Patent
active
047508744
ABSTRACT:
A dual flow air ring is used to cool the exterior surface of thermoplastic tube after the plastic is extruded from an annular die. The surface of the wall forming the divider between the upstream and downstream flow paths which confronts the extruded tube is shaped to include a region of decreasing diameter in the direction of tube travel so that the flow path for air issuing from the lower discharge formed between the extruded tube and the surface is caused to converge. This converging flow stabilizes the tube thereby permitting more vigorous cooling and consequently higher production rates.
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patent: 4478564 (1984-10-01), Shinmoto
Plastic World Magazine, Sep. 1986, p. 53.
Plastics Machinery and Equipment, Sep. 1986, p. 30, paragraph 3, sentence 6, also FIG. 8.
Plastics Machinery and Equipment, Sep. 1986, p. 25.
Chiesa Richard L.
Gloucester Engineering Co. Inc.
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