Process for injection molding of phenolic resin molding material

Details Process for injection molding of phenolic resin molding material Process for injection molding of phenolic resin molding material

1995-07-28

1997-10-21

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

26432818, 26433122, B29C 4500, B29C 4560

Patent

active

056793057

ABSTRACT:
The present invention provides a process for injection molding a phenolic resin molding material which includes injection molding a phenolic resin molding material having a melt viscosity of 10.sup.4 Pa.cndot.s or lower, preferably 10.sup.3 Pa.cndot.s or lower at 100.degree. C. by an injection molding machine having a screw of 1.5 or higher in compression ratio and/or provided with a back-flow stopping ring at the tip portion of the screw.
According to the present invention, it is possible to carry out injection molding of phenolic resin molding materials with injection molding machines generally used for molding of thermoplastic resins by employing phenolic resin molding materials which are low in viscosity in molten state. Furthermore, the injection molding can be carried out under relatively low pressure and thus, occurrence of flash can be inhibited.

REFERENCES:
patent: 4263248 (1981-04-01), Annis

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