| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To quickly diffuse physical foaming agent to molten resin stored in a metering resin reservoir part, and to prevent the physical foaming agent supplied to the metering resin reservoir part from flowing to a screw body side. <P>SOLUTION: A sleeve at least a part of which is formed by a porous material and has a center hole constituting a part of a resin passage in the portion formed by the porous material, is incorporated in a heating cylinder head. An introduction space for the physical foaming agent is formed in an outer peripheral portion of the sleeve. A physical foaming agent supply nozzle is mounted on the heating cylinder head. The physical foaming agent supplied from the nozzle is injected into the introduction space for the physical foaming agent. The physical foaming agent injected into the introduction space is supplied to the inside of the resin passage opened in the heating cylinder head through fine holes provided in the porous material. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
