Hot runner sprue
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsMasatoshi Nakaya, Shozo Tabata
Life of this patent
Estimating the term…
Abstract
When a molding machine nozzle is separated from a nozzle touch surface of a hot runner sprue, application of external pressure on resin in a resin supply passage is stopped. At this time, back pressure of resin in the resin supply passage that is received by a seal exceeds atmospheric pressure, and thus the seal is moved to seal an opening of the resin supply passage from the inside of the resin supply passage. As a result, leakage of resin from the hot runner sprue is inhibited, and mixing of air in the resin in a runner is also inhibited.
Claims16
A hot runner sprue that serves as a connector that connects with a molding machine nozzle and that feeds resin supplied from the molding machine nozzle to a manifold of a hot runner block, comprising:
- a hot runner sprue main body that is formed with a nozzle touch surface that touches the molding machine nozzle and a resin supply passage connecting to the manifold and having an opening at one end that opens to the nozzle touch surface, and
- a seal, provided in the resin supply passage, that does not obstruct resin flow when resin is being supplied from the molding machine nozzle, and that receives back pressure of resin in the resin supply passage when supply of resin from the molding machine nozzle is stopped and seals the opening of the resin supply passage from the inside of the resin supply passage.
Dependencies are inferred from the claim text.