| 摘要 |
There is provided a method for injection-molding an elongate hollow workpiece about a central core. A first quantity of plastic is injected into a first mold cavity through which part of the core extends, to form a spacer element around the core. After the spacer element has hardened, the core and spacer element are transferred to a second mold cavity in which the spacer element holds the core separated from the walls, thereby supporting it against lateral movement. Then, a second quantity of plastic is injected into the second mold cavity to complete the workpiece.
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