B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 45/00 (2006.01) B29C 45/17 (2006.01) B29C 49/00 (2006.01)
Patent
CA 2095331
A method of gas-assisted injection molding in which: 1) a first amount of plastic is injected into an article-defining cavity of a mold so that it flows therein; 2) a second amount of plastic continues to be injected into the cavity simultaneous with the injection of a charge of pressur- ized gas wherein the pressurized gas pre- vents the flow of plastic in the cavity from stopping; and 3) the charge of pressurized gas continues to be injected after the sec- ond amount of plastic is injected to distri- bute the total amount of molten plastic resin in the cavity. The ratio for the first amount of plastic to the total amount of plastic required for the preparation of the article is in the range of .2 to .7. Also, the pressurized gas has a pressure between approximately 1000 psi and 5000 psi. These steps prevent imperfections on the exterior surface of the plastic article. The gas charge is maintained under pressure within the article until the article has set up in the article-defining cavity. Finally, the gas pressure is relieved in the article and the finished article is removed from the mold. The method is particularly useful in molding articles having a relative large cross-section.
Melea Limited
Smart & Biggar
LandOfFree
Method for the use of gas assistance in the molding of... 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 the use of gas assistance in the molding of..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for the use of gas assistance in the molding of... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1790612