| 摘要 |
This invention relates to a hot tip seal located between the nozzle and the gate in an injection molding system. The seal has a generally cylindrical hollow outer portion which is seated in the nozzle and extends to abut on the cavity plate around the gate. Three ribs extend radially from the outer portion to an elongated central pin portion and define apertures therebetween. Pressurized melt flows from a central passage in the nozzle, through the apertures around the central pin portion, and into the cavity. The nozzle seal prevents direct contact between the heated nozzle and the cooled cavity plate to reduce heat loss, while at the same time improves heat transfer to the gate area by conducting heat downstream to a tip of the central pin portion which extends into the gate. In one embodiment, the central pin portion is enlarged and formed of a more conductive material to improve this process.
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