초록 ▼

A gate insert (10, 110) for a stack assembly in an injection molding machine having a gate (16, 116) through which a melt of thermoplastics material enters a mold cavity (14, 114). The gate insert has a cooling channel (18, 118) surrounding, and substantially uniformly spaced from, the gate (16, 11

A gate insert (10, 110) for a stack assembly in an injection molding machine having a gate (16, 116) through which a melt of thermoplastics material enters a mold cavity (14, 114). The gate insert has a cooling channel (18, 118) surrounding, and substantially uniformly spaced from, the gate (16, 116). The cooling channel has an inner surface with a profile substantially parallel to the gate. The cooling channel is further defined by either a structural insert in the form of a split ring (30) or by a recess (23) in a two-piece gate insert having interconnecting surfaces (111a, 111b).

대표청구항 ▼

What is claimed is: 1. A gate insert for a stack assembly of a mold, the gate insert comprising: a gate through which, in use, melt material can enter a mold cavity; a circumferential groove around the gate, wherein a distance between the circumferential groove and the gate is substantially uniform

What is claimed is: 1. A gate insert for a stack assembly of a mold, the gate insert comprising: a gate through which, in use, melt material can enter a mold cavity; a circumferential groove around the gate, wherein a distance between the circumferential groove and the gate is substantially uniform around the gate; a plurality of inserts operatively mounted in and occupying a majority of the circumferential groove in the gate insert for supporting the gate insert; a cooling channel surrounding the gate and defined between the gate and at least one of the plurality of inserts, the cooling channel shaped to follow a profile of at least part of said gate and spaced by a substantially uniform distance from a surface of the gate; and a coolant passageway connecting, in use, the cooling channel to a coolant supply. 2. The gate insert of claim 1, wherein the cooling channel is further shaped to follow a profile of an upper part of the mold cavity adjacent the gate. 3. The gate insert of claim 1, wherein the cooling channel is further shaped to follow a profile of a nozzle interface adjacent the gate. 4. The gate insert of claim 1, wherein the coolant passageway comprises an inflow passageway and an outflow passageway, each passageway in fluid connection with the cooling channel. 5. The gate insert of claim 1, wherein the gate insert comprises a nozzle half and a molding half, each with interconnecting surfaces. 6. The gate insert of claim 5, wherein the cooling channel and the coolant passageway are formed from a recess at the interconnecting surfaces of the nozzle half and molding half. 7. The gate insert of claim 6, wherein a portion of the recess is provided on each interconnecting surface of the nozzle half and molding half. 8. A gate insert for a stack assembly in an injection molding machine, the gate insert comprising: a gate through which a melt enters a mold cavity; a recess surrounding the gate; a structural insert in and occupying at least fifty percent of the recess to support the gate insert, wherein an area between the structural insert and the gate define a cooling channel, the cooling channel having an inner surface with a profile partially defined by a surface spaced substantially uniformly around the gate; a coolant passageway through the structural inserts that, in use, connects the cooling channel to a coolant supply. 9. The gate insert of claim 8, wherein an outer surface of the cooling channel is defined by an inner surface of the structural insert. 10. The gate insert of claim 9, wherein the structural insert is a split ring. 11. The gate insert of claim 10, wherein the split ring and the gate insert are both manufactured from identical material. 12. The gate insert of claim 10, wherein the coolant passageway is defined in opposed mating surfaces of the split ring. 13. A stack assembly in an injection mold, the stack assembly including: a gate through which a melt of plastic material enters a mold cavity adjacent the gate; a groove surrounding the gate, wherein a distance between the groove and the gate is substantially uniform around the gate; a structural insert in and occupying a majority of the groove for supporting the gate insert; cooling channel defined at least in part by a first surface of the groove which is substantially parallel to and spaced from a surface of the gate to a first surface of the structural insert, the cooling channel providing substantially uniform heat transfer between the aforesaid surfaces. 14. The assembly of claim 13, wherein the cooling channel is further defined by a second surface substantially parallel to and spaced from an upper part of the mold cavity. 15. The assembly of claim 14, further comprising a nozzle interface portion adjacent the gate wherein the cooling channel is further defined by a third surface substantially parallel to and spaced from a surface forming the nozzle interface portion. 16. The assembly of claim 15, wherein a distance between any one of: the first surface of the cooling channel and the surface of the gate; the second surface and the surface of the upper part of the mold cavity; and the third surface and the surface of the nozzle interface; is greater than 2 mm. 17. The gate insert of claim 8, wherein the gate insert is in an injection mold. 18. The gate insert of claim 8, wherein the mold is in an injection molding machine.