Hot-runner molding apparatus and hot-runner nozzle

Patent metadata

Field	Value
Publication number	US-9610722-B2
Application number	US-201414484721-A
Country	US
Kind code	B2
Filing date	Sep 12, 2014
Priority date	Sep 27, 2012
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

A hot-runner molding apparatus includes a hot-runner nozzle, a hot-runner molding die and a runner unit. The positions of outflow hole portions are arranged rotationally-symmetrical with respect to the positions of the runner groove portions in such a manner that the molten resin is equally distributed from a gate hole portion to the runner groove portions.

First claim

What is claimed is:

1. A hot-runner molding apparatus comprising:
a hot-runner nozzle which includes:
an axial center channel extending along a center axis and terminating at a distal end; and
n outflow channels, n being an integer greater than one, each outflow channel extending at an acute angle relative to the central axis from the distal end to a respective outflow hole such that when molten resin flows downstream through the center channel into the outflow channels it exists through the outflow holes;

a tubular hot-runner molding die into which a distal end of the hot-runner nozzle extends, an outer peripheral surface of the hot-runner nozzle and an inner peripheral surface of the tubular hot-runner molding die cooperating to form an exit channel extending from the outflow holes to a gate located downstream of the outflow holes relative to the flow direction of the molten resin; and
a multi-piece runner unit having n mold cavities and n runners, each runner extending from the gate to a respective one of the mold cavities in a radial direction relative to the central axis such that n molded articles can be cast simultaneously;
the positions of the outflow holes being arranged rotationally-symmetrical with respect to the positions of the runners in such a manner that when the molten resin flows downstream from the exit channel, through the gate and into the runners it is equally distributed between the runners.

2. The hot-runner molding apparatus according to claim 1 , wherein each of the outflow holes is located in the same circumferential position as a respective one of the runners relative to the central axis.

3. The hot-runner molding apparatus according to claim 1 , wherein the hot-runner nozzle comprises a main body and an end tip detachably connected to the main body, the outflow channels being formed in the end tip.

4. The hot-runner molding apparatus according to claim 3 , wherein the end tip has n chamfered portions arranged on a wall surface of the end tip and facing the exit channel, each chamfered portion being located in the same circumferential position as a respective one of the runners relative to the central axis.

5. The hot-runner molding apparatus according to claim 1 , wherein the exit channel is conical in shape.

6. A hot-runner comprising:
a hot-runner nozzle which includes:
an axial center channel extending along a center axis and terminating at a distal end; and
n outflow channels, n being an integer greater than one, each outflow channel extending at an acute angle relative to the central axis from the distal end to a respective outflow hole such that when molten resin flows downstream through the center channel into the outflow channels it exists through the outflow holes;

a tubular hot-runner molding die into which a distal end of the hot-runner nozzle extends, an outer peripheral surface of the hot-runner nozzle and an inner peripheral surface of the tubular hot-runner molding die cooperating to form an exit channel extending from the outflow holes to a gate located downstream of the outflow holes relative to the flow direction of the molten resin; and
a multi-piece runner unit having n runners, each runner extending from the gate in a radial direction relative to the central axis;
the positions of the outflow holes being arranged rotationally-symmetrical with respect to the positions of the runners in such a manner that when the molten resin flowing downstream from the exit channel, through the gate and into the runners it is equally distributed between the runners.

7. The hot-runner according to claim 6 , wherein each of the outflow holes is located in the same circumferential position as a respective one of the runners relative to the central axis.

8. The hot-runner according to claim 6 , wherein the hot-runner nozzle comprises a main body and an end tip detachably connected to the main body, the outflow channels being formed in the end tip.

9. The hot-runner according to claim 8 , wherein the end tip has n chamfered portions arranged on a wall surface of the end tip and facing the exit channel, each chamfered portion being located in the same circumferential position as a respective one of the runners relative to the central axis.

10. The hot-runner according to claim 6 , wherein the exit channel is conical in shape.

Assignees

• Olympus Corp

Inventors

• Iwasawa Koki

Classifications

• B29C45/278 Primary

  Nozzle tips (B29C45/2735 takes precedence) · CPC title

• B29C45/20

  Injection nozzles {(B29C45/1603 takes precedence)} · CPC title

• B29C45/27 Primary

  Sprue channels {; Runner channels or runner nozzles} · CPC title

• B29C45/0046

  Details relating to the filling pattern or flow paths or flow characteristics of moulding material in the mould cavity · CPC title

• B29C2045/2779

  Nozzles with a plurality of outlets · CPC title