RELEASING METHOD FOR RESIN MOLDED PRODUCT

• Main Authors: AMANO YASUO, YOSHII MASAKI, UEDA KOJI, UEDA MASANOBU
• Format: Patent
• Language: English
• Published: 14.06.1989
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

PURPOSE:To release easily without damaging recessed and projected sections of a surface by quenching and releasing a surface not being in contact with a mold from which a resin molded product is released when the resin molded product with recessed and projected sections on its surface is released. CONSTITUTION:For example, when a Fresnel lens is released from a mold, liquid nitrogen 12 jetting out of a jetting nozzle 7 is hit on an outer periphery of a surface opposing to a prism transfer surface of a molded Fresnel lens 3 and the section hit by liquid nitrogen is quenched. Then, while the jetting nozzle 7 is moved from the outer periphery to a central section on a couple of rails 11 placed on a bottom force 2 as a base and disposed on the upper section of the Fresnel lens 3, ejecting pins 5 and 6 are lifted up and the Fresnel lens 3 is released from a mold 4. In other words, part of an upper surface 3a is shrinked suddenly by quenching the outer periphery of the Fresnel lens 3 adhered closely to the mold 4. On the other hand, as a lower surface 3b adhered to the mold 4 retains the mold temperature, a temperature difference is generated between the upper surface 3a and the lower surface 3b, and a large local shrinkage 17 is generated on the upper surface 3a.