| 摘要 |
<p>An improved method of injection molding is characerized by an annular flow of resin materials into a mold cavity to produce a molded article. The innermost resin material within the annular stream of material flows in an inside-out pattern and forms the cap layer of the molded article. The inner core material of the molded article concentrically surrounds the cap material during the injection process except for the leading edge of the inner core material which is preceded by the cap material into the mold cavity. The molded article may have two or more layers created by the process wherein each of the layers can be controlled in terms of their thickness and content within the molded article. If more than two resin materials are provided in a concentric arrangement during flow, these additional materials can either flow in a laminar flow pattern within the mold, or can flow in an inside-out flow pattern similar to the cap material, each type of additional material flow creating an additional layer of the molded article. Indicia may be formed on the molded article by creating recessed or protruding portions on the molded article and then applying a highlighter such as a marker, grinder or hot stamp.</p> |
