Method of reducing internal stresses and improving the mechanica

Details Method of reducing internal stresses and improving the mechanica Method of reducing internal stresses and improving the mechanica

1978-07-19

1980-12-02

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

B29F 100

Patent

active

042370892

ABSTRACT:
A method of reducing internal stresses in and improving the mechanical properties of injection molded articles made of thermoplastic resins is disclosed wherein under in other respects normal injection molding conditions thermoplastic resins are injection molded at high injection and holding pressures within the range 250-800 MPa.

REFERENCES:
patent: 2033735 (1936-03-01), Pack
patent: 3243851 (1966-04-01), Reitter, Jr. et al.
Menges et al., Injection Machine Design in the 1980's, Plastics & Polymers, Jun. 1972.
Glanvill, A. B., Plastics Engineer's Data Book, 1974, Industrial Press, New York, N.Y., p. 34 to 40 relied on.
Rubin, Irvin, Injection Molding Theory and Practice, 1972, Wiley Interscience Publication, p. 269 to 279 relied on.
Bradshaw et al., Saran for Injection Molding, Modern Plastics, Oct. 1942, p. 6 of reprint in 264/328 relied on.
G. Menges, W. Dalhoff, and P. Mohren, "Heat-Sensitive Materials? Turn on the Pressure", SPE Journal, 4-1972, vol. 28, pp. 72-76.
Joel Frados, Plastics Engineering Handbook, 1976, Fourth Edition, pp. 93-94.
E. C. Bernhardt, Dr. Ing., Processing of Thermoplastic Materials, 1965, 5th printing, pp. 348-349.

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