| 摘要 |
The present invention relates to a method of injection moulding an ornamental product of thermoplastic material the improvement comprising adding a foaming agent to the thermoplastic material, differentially cooling the product inside the mould whereby the parts to be expanded are cooled sufficiently to form a skin, but where said parts have a temperature remaining high enough to permit foaming expansion outside the mould while the balance of the product is cooled below the solidification temperature of the polymer.
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