B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/702
B29C 45/23 (2006.01) B29C 45/27 (2006.01) B29C 45/28 (2006.01) B29C 45/57 (2006.01)
Patent
CA 1202459
ABSTRACT OF THE DISCLOSURE An injector nozzle valve and accumulator assembly is described which is suitable for forming a plurality of pari- sons in a parison mold, which assembly includes a barrel and plasticizing screw. At the end of the barrel a first passage for plasticized material is connected to a second passage through an openable and closable valve. The second passage is in communication with an accumulator chamber and also a mold cavity through a valve chamber. The valve chamber has gate valve means for closing off the mo d cavity from contact with the plasticized material. The accumulator chamber which in- cludes cylinder and piston means provides moldable material to the site of the mold cavity when the plasticizer screw/barrel is out of communication with the mold cavity. The accumulator chamber will also provide moldable plastic material upon contraction of the plastic material within the mold cavity as a result of curing. The injector nozzle valve and accumulator assembly is advantageous in that the accumulator chamber, in combination with an accumulator piston, provides a holding pressure on the mold cavity while the injector or plasticizing screw is plasticizing the next charge of plastic melt; the accumulator cylinder is purged after each cycle, and then recharged with fresh plastic melt on the next operation to assure that residual material does not remain in the system; and a proper holding pressure is maintained on the mold cavity while constantly adding material to the mold cavity to reduce mold part shrinkage, thereby maintaining uniform wall thick- ness and temperature within the wall of a formed part.
423418
Emhart Industries Inc.
Meredith & Finlayson
LandOfFree
Injection mold assembly does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Injection mold assembly, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Injection mold assembly will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1240680