| 摘要 |
A method for manufacturing plastic products, wherein in a mold products are injection molded from plastic, wherein in the plastic mass from which the products are injection molded propellant or propellant evolving agents are included, which method comprises the following steps: closing a mold, such that at least one mold cavity is formed; introducing the heated plastic mass under pressure; during cooling of the product in the mold, enlarging the space for the mass and/or lowering the pressure in the mold, such that in the partially cooled product a propellant is released so that at least locally in the walls of the product formed cavities are blown and at least locally a slightly foamy wall structure is obtained; and further cooling the product formed, the procedure being such that at least a portion of the product has a substantially massive wall structure and at least one other portion of the product has a foamed wall structure. |
