| 摘要 |
<p>In production of a thin-walled plastics shaped article by injecting molten plastics (A) into a stamping mold (SM) with fixed and movable mold halves, an opening gap or variable size cavity being formed when the mold is open or closed respectively, the movable half is moved onto the fixed half and the SM is moved so that the gap is continuously reduced. When the SM is closed (A) is injected, and the cavity is made smaller by continued SM movement until the final article size is reached. Production of a thin-walled plastics shaped article involves injecting molten plastics (A) into a stamping mold (SM) with at least one fixed and at least one movable mold half. An opening gap is formed between the halves when the mold is open and a cavity of variable size is formed when the mold is closed. (A) is injected into the SM during motion of the movable half onto the fixed half. The novel feature is that the movable half is moved onto the fixed half without interruption and the SM is moved forwards so that the opening gap is continuously reduced. When the SM is closed (A) is injected into the formed cavity. The cavity is made smaller by continued movement of the SM until the size of the finished article is reached, and the article is molded. An independent claim is included for a variant of the process, in which injection of (A) is started before the SM is closed; movement of the SM is continued until the SM is closed, before (A) has reached the opening gap; and the cavity is made smaller by continued movement of the SM until the size of the finished article is reached, and the article is molded.</p> |
