Tip heated hot runner nozzle
AssigneeKona Corporation
InventorsWilliam J. Hume, Michael L. Vasapoli
Life of this patent
Estimating the term…
Abstract
An injection molding nozzle is provided that includes a heater disposed about an insert seated in the nozzle body. The heater provides extra heat about the insert where heat loss to the mold can cause a reduction in melt temperature. The heater remains on from one injection cycle to the next injection cycle. In one embodiment, a thermocouple is used to measure the temperature about the insert so that the intensity of the heater can be adjusted accordingly. The heater can also be used with nozzles used in multiple nozzle applications to balance the flow of the nozzles.
Claims43
An injection molding nozzle for injecting molten material into a mold cavity during an injection cycle, comprising:
- a nozzle body having a central bore through which the molten material passes during the injection cycle;
- an insert seated in the nozzle body, the insert having a central bore through which the molten material passes from the central bore of the nozzle body during the injection cycle;
- a tip attached to the nozzle body about the insert to form a seal with the mold cavity, and to insulate the insert from the mold so that there is an absence of contact between the insert and the mold, wherein a recess is formed between the insert and the tip;
- and
- a first heater disposed in the recess between the insert and the tip.
An injection molding nozzle for injecting molten material into a mold cavity during an injection cycle, comprising:
- a nozzle body having a central bore through which molten material passes during the injection cycle;
- an insert seated in the nozzle body, the insert having a central bore through which molten material passes from the central bore of the nozzle body during the injection cycle;
- and
- a heater disposed about the insert, the heater being adapted to remain on from one injection cycle to a next injection cycle.
A plurality of injection molding nozzles for injecting molten material into a single mold cavity, each nozzle comprising:
- a nozzle body having a central bore through which material passes during the injection cycle;
- an insert seated in the nozzle body, the insert having a central bore through which molten material passes from the central bore of the nozzle body during the injection cycle;
- and
- a heater disposed about the insert;
- wherein each of the heaters of each of the plurality of injection molding nozzles is adapted to be controllable independent from one another.
Dependencies are inferred from the claim text.