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US 9,174,372 B2Granted
Shut off nozzle system and methods for making and using the same
AssigneeSabic Global Technologies B.V.
InventorsUlrich Hofmann, Richard Schouwenaar
Life of this patent
Estimating the term…
Abstract
In one embodiment, a tool, comprising: a tool stationary portion comprising a nozzle and a film gate; and a tool movable portion comprising a shut off pin opposite the nozzle and the film gate; wherein the shut off pin prevents polymer melt in the nozzle from leaking into a cavity of the tool after injection of polymer into the tool.
Claims15
A method of making a shaped part, comprising:
- closing a tool comprising a first portion comprising a nozzle and a second portion comprising a shut off pin opposite the nozzle, and a film gate and a mold cavity formed between the first portion and the second portion;
- injecting polymer melt into the mold cavity of the tool, wherein the polymer melt flows through the nozzle and through the film gate;
- blocking the nozzle by direct contact with the shut off pin;
- completing a compression stroke wherein the mold cavity is compressed, a thickness of the film gate is decreased, and the shut off pin moves;
- releasing the shut off pin;
- pushing the shut off pin in the opposite direction of the nozzle;
- opening the tool;
- ejecting the shaped part;
- and
- pulling leftover material from the nozzle with the shut off pin.
7 more elements
A method of making a shaped part, comprising:
- closing a tool comprising a first portion comprising a nozzle and a second portion comprising a shut off pin opposite the nozzle, and a film gate and a mold cavity formed between the first portion and the second portion;
- injecting polymer melt into the mold cavity of the tool, wherein the polymer melt flows through the nozzle and through the film gate;
- blocking the nozzle by direct contact with the shut off pin;
- completing a compression stroke wherein the mold cavity is compressed, a thickness of the film gate is decreased, and the shut off pin moves;
- opening the tool;
- and
- ejecting the shaped part.
4 more elements
A tool, comprising:
- a first portion comprising a nozzle;
- and
- a second portion comprising a shut off pin opposite the nozzle;
- a film gate between the first portion and the second portion, wherein the film gate has an injection thickness;
- wherein the first portion and/or the second portion is movable to close and form a mold cavity so that an injected polymer can be compressed between the first portion and the second portion;
- wherein the shut off pin is movable to directly contact the nozzle and prevent polymer melt in the nozzle from leaking into the cavity of the tool after injection of polymer into the tool;
- and
- wherein the tool is configured such that the compression both decreases a film gate thickness from the injection thickness to a compression thickness, moves the shut off pin, and forms the mold cavity.
5 more elements
A tool, comprising:
- a first portion comprising a nozzle through which polymer melt flows laminarly;
- a second portion comprising a shut off pin;
- and
- a film gate between the first portion and the second portion, wherein the film gate has an injection thickness;
- wherein the first portion and the second portion form a mold cavity when the tool is closed;
- wherein the shut off pin is configured to move to directly contact and block the nozzle after injection of polymer melt into the cavity;
- and
- wherein the shut off pin is configured to move to allow compression of the film gate and the mold cavity after injection of the polymer melt.
5 more elements
Dependencies are inferred from the claim text.