HEAT INSULATING CONTAINER OF SYNTHETIC RESIN AND HEAT INSULATING COVER OF SYNTHETIC RESIN

摘要

A heat insulating container of a synthetic resin wherein inner and outer container members (4, 3) of a synthetic resin are joined together in a united state with a hollow space therebetween to form a container of a double walled structure. A gas of a low thermal conductivity is sealed in the hollow space (5) in the container to form a heat insulating layer (6). A gas replacement through hole (7) is made in the central portion of one of the inner and outer container members (4, 3), and a projection (14) which projects toward the wall in which the through hole (7) is made, or the wall opposed to the through hole, and which is adapted to prevent the inner and outer container members from being brought into close contact with each other is provided in the vicinity of the through hole (7). During the evacuation of the hollow space (5) to seal the gas therein, the inner and outer container members (4, 3) are not deformed and brought into contact with each other, efficiently evacuating the hollow space. Thus a container having an excellent heat insulating performance is provided.