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 (200) for decreasing acetaldehyde level in a molded article. The method (200) of decreasing acetaldehyde content in a molded article to be produced comprises introducing (202) into a feed throat (120) of an injection unit (100) a PET material to be plasticized, the PET material having been dried in a pre-treatment chamber (130); and introducing (204) into the feed throat (120) an un-treated agent (136) configured to increase moisture level of the PET material to be plasticized. In some embodiments of the present invention, the un-treated agent (136) is also configured to provide additional lubrication to the plasticizing screw (106).
Claims35
A method (200) of decreasing acetaldehyde content in a molded article to be produced, the method (200) comprising:
- introducing (202) into a feed throat (120) of an injection unit (100) PET material to be plasticized, the PET material having been dried in a pre-treatment chamber (130);
- introducing (204) into the feed throat (120) an un-treated agent (136) configured to increase moisture level of the PET material to be plasticized.
An injection unit (100), comprising:
- an inlet (110) having a feed throat (120) for accepting, in use, PET material that has been dried in a pre-treatment chamber (130);
- a plasticizing sub-system for plasticizing the PET material into plasticized material;
- an outlet (118) for outputting the plasticized material;
- the inlet (110) being associated with a dosing unit (134), the dosing unit (134) being operatively coupled to a source of an un-treated agent (136), the dosing unit (134) being configured to introduce into the feed throat (120) the un-treated agent (136) configured to increase moisture level of the PET material to be plasticized.
A method (200) of decreasing acetaldehyde content in a molded article to be produced, the method (200) comprising:
- introducing (202) into a feed throat (120) of an injection unit (100) a PET material to be plasticized, the PET material having been dried in a pre-treatment chamber (130);
- introducing (204) into the feed throat (120) an un-treated agent (136), the un-treated agent (136) having one of an amorphous structure and a semi-crystalline structure, the un-treated agent (136) configured to increase moisture level of the PET material to be plasticized and to provide additional lubrication to a plasticizing screw (106) of the injection unit (100).
A method (200) of decreasing acetaldehyde content in a molded article to be produced, the method (200) comprising:
- introducing (202) into a feed throat (120) of an injection unit (100) a PET material to be plasticized, the PET material having been dried in a pre-treatment chamber (130);
- introducing (204) into the feed throat (120) an un-treated agent (136), the un-treated agent (136) selected from a list including:
- un-treated PET material;
- re-pelletized re-cycled PET,
- post-consumer recycled PET flakes,
- PET preform re-grind,
- PET bottle re-grind,
- PET scrap re-grind, and
- a combination of at least some thereof.
A method (200) of decreasing acetaldehyde content in a molded article to be produced, the method (200) comprising:
- introducing (202) into a feed throat (120) of an injection unit (100) molding raw material to be plasticized, the molding raw material having been dried in a pre-treatment chamber (130);
- introducing (204) into the feed throat (120) an un-treated agent (136) configured to increase moisture level of the molding raw material to be plasticized.
An injection unit (100), comprising:
- an inlet (110) having a feed throat (120), the inlet (110) being operatively connectable, in use, to a pre-treatment chamber (130) to accept PET material having been dried in the pre-treatment chamber (130) and to a source of an un-treated PET material via a dosing unit (134);
- a plasticizing sub-system for plasticizing the PET material and the un-treated PET material into plasticized material;
- an outlet (118) for outputting the plasticized material;
- the dosing unit (134) being configured to introduce into the feed throat (120) 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.