Improved pressure-holding chamber type injection molding process and apparatus for injection molding of products
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 15, 1993
Grant Date -
N/A
app pub date -
Jul 30, 1990
filing date -
Oct 13, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system of injection molding by an injection machine with a mold includes conventional fundamental steps including a material plasticizing and metering step, a material injecting step and a material pressure-holding step, but with an additional feature in that nozzle passage is interrupted midway therealong from communication between the interior of a machine body and a mold cavity, after the injecting step but while the material pressure-holding step is being carried out. The material pressure-holding step is carried out first using the injection machine per se operated with a plunger to exert a first non-stepped external or internal pressure on the entire injected material but second using another mechanism for exerting a second non-stepped or stepped internal pressure on a forward portion of the injected material separated due to the nozzle passage interruption.
First Claim
Other Claims data not available
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
- 12 Citation Count
- B29C Class
- 56.67 % this patent is cited more than
- 32 Age