公开(公告)号：US20170120540A1

公开(公告)日：2017-05-04

申请号：US15319574

申请日：2015-05-25

Applicant: ENPLAS CORPORATION

Inventor： Kei SERIZAWA ,  Koji NOGUCHI

IPC: B29C67/20 ,  B29C67/04 ,  B29C43/36

CPC classification number: B29C67/205 ,  B29C43/006 ,  B29C43/027 ,  B29C43/10 ,  B29C43/36 ,  B29C67/04 ,  B29C2043/3628 ,  B29K2023/06 ,  B29K2023/12 ,  B29K2025/06 ,  B29K2033/12 ,  B29K2077/00 ,  B29K2105/04 ,  B29K2905/00 ,  B29L2031/14

Abstract: A first compressed portion is formed by heating the plastic powder packed in a cavity of a metal mold and sintering a first portion of the plastic powder packed in the cavity in a first compression state. In addition, a second compressed portion is formed by sintering a second portion of the plastic powder packed in the cavity in a second compression state. A lot of interconnected minute voids are formed in the first compressed portion and a lot of interconnected minute voids smaller than the voids in the first compressed portion are formed in the second compressed portion. Such manufacturing work of a plastic sintered body is performed continuously in the metal mold. In addition, two types of porous portions including voids of different sizes are formed by sintering only one type of the plastic powder in the metal mold.