PURPOSE: To prevent the extruding material from leaking by forming an annular grooved part at the corresponding positions of mutually contacting surfaces of the pressing tool and the container, inserting an anular packing member in the grooved part so as to be mounted over the pressing tool and the container.
CONSTITUTION: The pressing tool 1 is brought into contact with the container 2, and the front end surface 2a of the container 2 is pressed to the rear end surface 3a of the baffle plate 3. The container side projecting part of the packing member 10 is fitted to the grove part 9 of the container side, and the outer peripheral surface 10c of the projecting part is pressed in the diameter reducing direction with the peripheral surface of larger diameter side 9b of the groove part 9 of container side. Then one side surface 10a of the packing member 10 is pressed to the bottom surface 8a of the baffle plate side groove part 8 accompanied with some deforming and the inner peripheral surface 10b is pressed to the smaller diameter side peripheral surfaces 8a, 9a of both groove parts 8, 9. Therefore, the material to be extruded can be prevented from leaking between the mutually contacting surfaces of the container 2 and the pressing toll.
HASHIMOTO ICHIRO
DOUSAKA KOUZOU
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