| 摘要 |
The present invention provides a runner system for a plastic injection mold through which molten plastic is injected into a mold cavity defined between two mold halves. The runner system includes two mold cores each of which has a slot, a clamping plate for clasping the two mold cores and combing the slots to define therebetween a runner, and a sprue extending through one of the mold halves and connecting an entrance of the runner. The clamping plate and the clasped two mold cores are embedded into the other mold half. The clamping plate defines a gate connecting an exit of the runner to said mold cavity. The clamping plate seals at least a portion of the joint formed between the two mold cores and adjacent an exit of the runner to prevent molten plastic material from flowing into the joint to form seaming lines on surfaces of molded plastic articles. Thereby, the molded plastic articles have smooth surfaces without seaming lines.
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