Patent ID: 6497838
Filing Date: 2002-12-24
Classification: B29C,B29K,B29L,B32B,B65D,Y10S,Y10T

Abstract:
A process for producing a hollow foamed polyolefin-based resin container comprising an inner layer and an outer layer, at least one of the inner and outer layers being formed of a foamed polyolefin-based resin sheet, wherein at least a side wall part of the container has a hollow portion between the inner and outer layers, the process using a female mold member having an outer surface configuration of the container and a male mold member having an inner surface configuration of the container, the process comprising:(1) heating and softening an original resin sheet while clipping and fixing the periphery of the original resin sheet with a clip, wherein said original resin sheet is either (a) a resin sheet in which two resin sheets including a resin sheet for forming the inner layer and a resin sheet for forming the outer layer are laminated one on another wherein both of the two resin sheets are formed of polyolefin-based resin and at least one of the two resin sheets is a foamed polyolefin- based resin sheet or (b) a resin sheet in which two resin sheets including a resin sheet for forming the inner layer and a resin sheet for forming the outer layer are separably laminated wherein both of the two resin sheets are formed of polyolefin-based resin and at least one of the two resin sheets is a foamed polyolefin-based resin sheet; (2) installing the male mold member and the female mold member in the opposite sides relative to the heated and softened original resin sheet, relatively moving the male and female mold members to fit them to the heated and softened original resin sheet, rendering both a gap between the female mold member and the heated and softened original resin sheet and a gap between the male mold member and the heated and softened original resin sheet of reduced pressure, thereby making the resin sheet for forming the inner layer closely touch the surface of the male mold member and making the resin sheet for forming the outer layer closely touch the surface of the female mold member to form a hollow portion and to form the heated and softened original resin sheet into a shape of container; and (3) removing the product that has been formed into the shape of the container.