Disc record press forming

Details Disc record press forming Disc record press forming

1983-04-20

1985-01-29

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Press forming apparatus having opposed press members

Opposed, registering, coacting mold cavities

249141, 264107, 425810, 425812, B29D 1700

Patent

active

044963009

ABSTRACT:
Stamper plates and backing plates in a tool for the pressing of video discs are recessed to permit the formation of an annular ridge which encircles the information region of a disc and is provided for use in the mechanical removal of a disc from its container. Apertures in an annular recess in a stamper plate are aligned with apertures in the associated backing plate to lead to a manifold which communicates with atmosphere. Air which may be present in the ridge of plastics material during the pressing operation thereby escapes to atmosphere, and blemishes in the ridge due to air entrapment are substantially avoided.

REFERENCES:
patent: 2615203 (1952-10-01), DuPree
patent: 2975481 (1961-03-01), Kauffman
patent: 2976571 (1961-03-01), Moslo
patent: 3341647 (1967-09-01), Aberle
patent: 4027726 (1977-06-01), Hodler
patent: 4085178 (1978-04-01), McNeely
patent: 4379686 (1983-04-01), Chambers et al.
Article entitled "Molding Records Automatically" by J. C. Ruda, (pp. 24-29).

Affiliated with

Also associated with

Rating

Disc record press forming does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Disc record press forming, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Disc record press forming will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-504420