| 摘要 |
A modular injection nozzle system for use with hot runner injection machines employs a thermal insulating element between the tip of the injecti on nozzle and a removable mold gate insert. This thermal insulating element limits the heat loss from the tip to the gate insert, assists in sealing the gate area and provides assistance in aligning the gate and the nozzle during assembly. The removable mold gate insert allows f or eased servicing and assembling/dis-assembling of the injection nozzle system and h as limited contact with the mold plate. In one embodiment, the removable gate insert is mounted to the nozzle via the insulating member, which is in the form of a sleeve with exterior threads which are complementary to interior threads on the gate insert. The sleeve c an either be press-fit onto the nozzle or can have interior threads which are complementa ry to exterior threads on the nozzle. In either case, the sleeve can assist in the alignmen t of the components of the nozzle system. In another embodiment, the insulating eleme nt also includes a gap between the nozzle tip and the gate insert, the gap having a suitable insulating gas or vacuum therein to provide additional insulation. In anothe r embodiment, the insulating element comprises a layer of insulating material on the nozzl e tip andthe gate insert can either be press fit with the layer or the layer can have exterior threads to engage complementary threads on the gate insert. In another embodiment, the insulating element is molded in place on the nozzle tip. In another embodiment, the insulating element is molded in place in the gate insert, and comprises interior thread s which are complementary to exterior threads on the nozzle.
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