Method of injection molding structural foam folding slat structu

Details Method of injection molding structural foam folding slat structu Method of injection molding structural foam folding slat structu

1974-08-28

1976-04-27

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By mechanically introducing gas into material

160229R, 264 54, 264294, 264296, 264328, 264DIG83, B29D 2700, B29F 100

Patent

active

039535606

ABSTRACT:
The invention relates to structures such as folding (tambour) doors comprising longitudinal juxtaposed slats and comprises a method of making such structures by introducing a molten synthetic resinous mass containing a foaming agent into a mould, permitting foaming of the mass and compressing the mass with a ribbed mould plunger to a predetermined distance above the floor of the mould to constitute the hinges.

REFERENCES:
patent: 2878153 (1959-03-01), Hacklander
patent: 2978020 (1961-04-01), Paulsrude
patent: 3222437 (1965-12-01), Schilling
patent: 3268636 (1966-08-01), Angell
patent: 3436446 (1969-04-01), Angell
patent: 3447199 (1969-06-01), Trimble
patent: 3454694 (1969-07-01), Delaire et al.
patent: 3632729 (1972-01-01), Bielfeldt
patent: 3767742 (1973-10-01), Robin
Czerski, J., "Injection-Moulded Foams," In Plastics & Polymers, Dec. 1971, pp. 406-411.

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