Method for extrusion production of large dimensional thermoplast

Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Production of continuous or running length

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15624414, 15624421, 264171, 264173, 26417719, 2642094, 2642102, 264237, 4251311, 425325, 4253261, B29C 4790

Patent

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047042443

ABSTRACT:
Thermoplastic articles such as fenders, of large cross-sectional dimensions, may be made by extrusion without shrinkage voids by extruding a first stream of thermoplastic as a hollow profile, and extruding a second stream of molten thermoplastic by a second extruder and forcing same under pressure into the hollow profile to fill the voids of shrinkage on cooling.

REFERENCES:
patent: 3189941 (1965-06-01), Reifenhauser
patent: 3477099 (1969-11-01), Lee et al.
patent: 3552259 (1971-01-01), Griffith
patent: 3825641 (1974-07-01), Barnett

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