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US 12,691,612 B2Granted
Injection moulding process for the preparation of a foamed article with improved surface quality
AssigneeSabic Global Technologies B.V.
InventorsAngel Yanev, Kar-Man Raymond Chu, Junhua Zhang, Dimphna Johanna Maria van Beek, Daniel Bande
Life of this patent
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Abstract
The present invention relates to an injection moulding process for the preparation of a foamed article with improved surface quality. The present invention further relates to a foamed article obtained or obtainable by the injection moulding process.
Claims20
An injection moulding process for preparing a foamed article in a mould comprising the following sequential steps:
- a) Closing the mould to form a mould cavity having a volume V1;
- b) Injecting a foamable polymer composition into the mould cavity to form a filled mold cavity in which at least 90% of the volume V1 is filled;
- c) Applying a pressure P to the foamable polymer composition in the filled mold cavity for a duration t, wherein P is in the range from 21.6 to 2160 bar, and t is in the range from 1.3 to 10.2 s;
- d) Increasing the volume of the filled mould cavity to a volume V2 to allow expansion of the foamable polymer into a pre-foamed article;
- e) Allowing the pre-foamed article to solidify to form the foamed article;
- and
- f) Ejecting the foamed article from the mould.
4 more elements
An injection moulding process for preparing a foamed article in a mould comprising the following sequential steps:
- a) Closing the mould to form a mould cavity having a volume V1;
- b) Injecting a foamable polymer composition into the mould cavity to form a filled mold cavity in which at least 90% of the volume V1 is filled;
- c) Applying a pressure P to the foamable polymer composition in the filled mold cavity for a duration t, wherein P is in the range from 21.6 to 2160 bar, and t is in the range from 5.1 to 10.2 s;
- d) Increasing the volume of the filled mould cavity to a volume V2 to allow expansion of the foamable polymer into a pre-foamed article;
- e) Allowing the pre-foamed article to solidify to form the foamed article;
- and
- f) Ejecting the foamed article from the mould.
4 more elements
Dependencies are inferred from the claim text.