Method of Decreasing Acetaldehyde Level in a Molded Article
AssigneeHusky Injection Molding Systems Ltd.
InventorDomenico FAVATA
Life of this patent
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Abstract
There is provided a method for decreasing acetaldehyde level in a molded article. The method of decreasing acetaldehyde content in a molded article to be produced comprises introducing into a feed throat of an injection unit a PET material to be plasticized, the PET material having been dried in a pre-treatment chamber ; and introducing into the feed throat an un-treated agent configured to increase moisture level of the PET material to be plasticized. In some embodiments of the present invention, the un-treated agent is also configured to provide additional lubrication to the plasticizing screw.
Claims31
A method of decreasing acetaldehyde content in a molded article to be produced, the method comprising:
- introducing into a feed throat of an injection unit PET material to be plasticized, the PET material having been dried in a pre-treatment chamber;
- introducing into the feed throat an un-treated agent configured to increase moisture level of the PET material to be plasticized.
An injection unit, comprising:
- an inlet having a feed throat for accepting, in use, PET material that has been dried in a pre-treatment chamber;
- a plasticizing sub-system for plasticizing the PET material into plasticized material;
- an outlet for outputting the plasticized material;
- the inlet being associated with a dosing unit, the dosing unit being operatively coupled to a source of an un-treated agent, the dosing unit being configured to introduce into the feed throat the un-treated agent configured to increase moisture level of the PET material to be plasticized.
A method of decreasing acetaldehyde content in a molded article to be produced, the method comprising:
- introducing into a feed throat of an injection unit a PET material to be plasticized, the PET material having been dried in a pre-treatment chamber;
- introducing into the feed throat an un-treated agent, the un-treated agent having one of an amorphous structure and a semi-crystalline structure, the un-treated agent configured to increase moisture level of the PET material to be plasticized and to provide additional lubrication to a plasticizing screw of the injection unit.
A method of decreasing acetaldehyde content in a molded article to be produced, the method comprising:
- introducing into a feed throat of an injection unit a PET material to be plasticized, the PET material having been dried in a pre-treatment chamber;
- introducing into the feed throat an un-treated agent, the un-treated agent selected from a list including:
- un-treated PET material;
- re-pelletized re-cycled PET,
- post-consumer recycled PET flakes,
- 2PET preform re-grind,
- PET bottle re-grind,
- PET scrap re-grind, and
- a combination of at least some thereof.
A method of decreasing acetaldehyde content in a molded article to be produced, the method comprising:
- introducing into a feed throat of an injection unit molding raw material to be plasticized, the molding raw material having been dried in a pre-treatment chamber;
- introducing into the feed throat an un-treated agent configured to increase moisture level of the molding raw material to be plasticized.
An injection unit, comprising:
- an inlet having a feed throat, the inlet being operatively connectable, in use, to a pre-treatment chamber to accept PET material having been dried in the pre-treatment chamber and to a source of an un-treated PET material via a dosing unit;
- a plasticizing sub-system for plasticizing the PET material and the un-treated PET material into plasticized material;
- an outlet for outputting the plasticized material;
- the dosing unit being configured to introduce into the feed throat an amount of the un-treated PET material, thereby to at least decrease content of acetaldehyde produced during plasticizing.
Dependencies are inferred from the claim text.