| 摘要 |
<p>PURPOSE:To provide a cosmetic container composed of a resin only, having glossy surface, free from the exposed glass fiber and air bubbles by using the metal dies employed in the molding of the container with their shaping surfaces preheated to a temperature higher than the deformation-causing temperature of thermoplastic resins. CONSTITUTION:A high-frequency oscillator 5 produces high-frequency current to generate eddy current on the shaping surfaces of metal dies in order to heat the same. The oscillator 5 of 50 - 70KW is employed which is capable of heating the shaping surfaces preheated to 60 - 80 deg.C by a heater to 100 - 130 deg.C with the oscillation time set at 5 - 10sec. After heating the shaping surfaces at least to 100 deg.C in this way, a cylinder 4 is actuated to remove a heater coil 3 from between metal dies 1 and 2 and, at the same time, the dies are closed. The thermoplastic resins (containing glass fiber or air bubbles due to foaming agent) heated at 180 - 260 deg.C into a molten state is injected into the dies from an injection device 6 and allowed to stand for predetermined hours for cooling. The dies are thereafter opened to take out the molded container.</p> |
