Molding die and molding method
AssigneeKabushiki Kaisha Meiki Seisakusho
InventorIkuo Asai
Life of this patent
Estimating the term…
Abstract
The transfer plate is energized and heated uniformly in the state in which the transfer plate heated through the electric resistance heating is separated slightly from the specular surface of the specular plate, then, immediately before the die is closed, the transfer plate is pressed against the specular surface to adhere thereto and, at the same time, the resin material is supplied to the cavity quickly and, after that, at the same time as the molded product is shaped completely, the transfer plate is de-energized so that the resin material in the cavity is quenched at the controlled temperature of the specular plate that is set to be lower than the heating temperature of the transfer plate.
Claims11
A molding die for molding a molded product wherein a heating element that is substantially rectangular and that is energized to generate heat through electric resistance heating is provided on either one or both of a specular surface of a specular plate of one die and a specular surface of a specular plate of the other die disposed oppositely to the specular surface of the specular plate of the one die and a resin material is supplied between the one die and the other die, the molding die comprising:
- the specular plates that are disposed on said one die and/or said other die and that are kept at a temperature at which at least a surface of the resin material can be cooled;
- the heating element having a substantially rectangular plate-like part that generates heat at least while being separated from the specular surfaces of said specular plates;
- heating element holders having abutting surfaces on which said heating element abuts when said heating element is separated from the specular surfaces of said specular plates;
- and
- a moving means for moving said heating element so that the heating element abuts on either one of the specular surface of the specular plate and the abutting surfaces of the heating element holders.
Dependencies are inferred from the claim text.