Injection molded knockout

Details Injection molded knockout Injection molded knockout

1981-10-09

1984-02-28

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Making hole or aperture in article

2643288, 26432812, B29F 100

Patent

active

044341202

ABSTRACT:
A technique is shown for injection molding knockout sections in plastic parts. Through the introduction of a weld line in a controlled manner, removable sections of any geometry may be incorporated in a part. By varying the weld line geometry, knockout forces may be varied over a wide range. An example of a circular knockout in polycarbonate material is shown.

REFERENCES:
patent: 2724867 (1955-11-01), Smith
patent: 3069105 (1962-12-01), Press
patent: 3767753 (1973-10-01), Suzuki
Plastics Engineering, Oct. 1973, pp. 67-69, "Weld-Live Fracture in Molded Parts".

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