Method for making plastic articles from resin

Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

26432814, 425548, B28B 124

Patent

active

045405417

ABSTRACT:
An improved device for making plastic articles from resin and an improved runner block assembly for a mold for making plastic articles from resin have been made by providing a runner block assembly having at least one channel wherein the channel has a cross-section with two opposite sides having a length substantially less than the two other sides thereby forming a thin, flat channel sufficient to provide shear resistance resulting from forcing resin through the channel; means for connecting the channel to a plurality of mold cavities, and means for supplying resin to the channel. Plastic articles are made from resin in a heated mold assembly wherein heated, flowable resin is passed under pressure from a resin supply means through a flow passageway to a mold cavity, the improvement comprising, passing the heated, flowable resin into a runner block assembly wherein the flow passageway is at least one channel connected to the resin supply means, the channel extending from the resin supply means to the mold cavity and having a large heated surface with a thin, flat cross-section sufficient to provide shear resistance resulting from forcing the resin under pressure through the channel; heating the resin in the channel of the runner block assembly at a temperature of about at least as high as the temperature of the mold but less than the decomposition temperature of the resin; and passing the heated resin into the mold cavity. A typical resin is a phenolic resin containing 20% glass fiber filler.

REFERENCES:
patent: 2524858 (1950-10-01), Thomas
patent: 2571766 (1951-10-01), Saulino
patent: 2894284 (1959-07-01), Allison et al.
patent: 3428289 (1969-02-01), Heckrotte et al.
patent: 3520026 (1970-07-01), Stidham et al.
patent: 3561061 (1971-02-01), Bucy
patent: 3568973 (1969-05-01), Rau
patent: 3591897 (1971-07-01), Perras
patent: 3623692 (1971-11-01), Buhrer
patent: 3779506 (1973-12-01), Adams
patent: 3819312 (1974-06-01), Arpajian
patent: 3871806 (1975-03-01), Leunig
patent: 3972663 (1976-08-01), Taniguchi
patent: 3981661 (1976-09-01), Taylor
patent: 4108956 (1978-08-01), Lee
patent: 4126292 (1978-11-01), Saeki et al.
patent: 4212626 (1980-07-01), Gellert
patent: 4238181 (1980-12-01), Dannels et al.
patent: 4239476 (1980-12-01), Somberg
patent: 4249882 (1981-02-01), Koch et al.
patent: 4298332 (1981-11-01), Aoki
Plastics Mold Engineering Handbook; J. H. DuBois and W. I. Pribble, 1978, Van Nostrand Reinhold Co., pp. 322-340.
Plastics Technology, 27, No. 4, p. 22, (Apr. 1981), "Hollow-Sprue Process Thermoset Molding Cycles".
Prost. Plastics Technology, 27, No. 5, pp. 67-69, (May 1981), "Hyperthermal Runner System".

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Method for making plastic articles from resin does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for making plastic articles from resin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for making plastic articles from resin will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1427785

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.