Method for removing a part made of a material having a glass-transition temperature from a mold

摘要

A method for removing a part from a mold and to a machine for molding the part, the part made of a material having a glass-transition temperature and a melting temperature that is higher than the glass-transition temperature, and which is shaped in the cavity of a mold, includes at least two mold portions defining the shaping cavity therebetween. The mold is at a temperature between the glass-transition temperature and the melting temperature. The method includes opening the mold by spacing apart the mold portions, locally spraying a cooling gas toward the part remaining in a portion of the mold using at least one nozzle, and, after a predetermined time period following the start of spraying the gas, ejecting the part from the portion of the mold, the time period being such that the part reaches a temperature that is lower than the glass-transition temperature thereof.

主权项

1. A method for removing from a mold a part made of a material that has a glass transition temperature and a melting point higher than said glass transition temperature, which is shaped in a cavity of a mold comprising:
providing at least two mold segments (3, 4) having a shaping cavity (5) therebetween, the mold at a temperature between said glass transition temperature and said melting point; opening of the mold by parting said at least two mold segments (3, 4); spraying a cooling gas toward the part that remains in one of the at least two mold segments; and, after a delay following the start of the spraying of the gas, ejecting the part from the one mold segment, the delay being such that the part reaches a temperature below said glass transition temperature.