PURPOSE: To provide a mold for hollow molding wherein a hesitation mark is generated at a position where no trouble occurs on appearance and molding of a hollow molded item is easily performed.
CONSTITUTION: The title mold is a mold 10 for hollow molding wherein a resin is cast in a cavity 2 up to a stopping position 25 where no trouble occurs even if a hesitation mark is generated on a hollow molded item and thereafter, a fluid such as air is fed to advance the resin in a runner 1 to the front molding part 22 and to form a hollow part in the resin and the runner 1 is formed of a long hollow part where the amt. of the resin to be fed into the front molding part 22 is once retained. us the long hollow part, a whirlpool, a spiral and a polycurved shape are cited. The stopping position can be also set in the runner 1.
| WO/1987/002681 | CURABLE COMPOSITION AND METHOD FOR MOLDING IT |
| JP2022138971 | INJECTION MOLDING MACHINE AND INJECTION FOAM MOLDING METHOD |
MORI TOSHIHIKO
YABUTANI SHIGERU
