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Application filed by А.Д. СоколовfiledCriticalА.Д. Соколов
Priority to SU3951868/05ApriorityCriticalpatent/SU1624860A1/en
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Publication of SU1624860A1publicationCriticalpatent/SU1624860A1/en
Processing And Handling Of Plastics And Other Materials For Molding In General
(AREA)
Abstract
FIELD: invention relates to technology of processing of plastic materials. SUBSTANCE: it makes it possible to reduce consumption of material, to increase quality of articles, to diminish power consumption of process and to enhance resistance of moulds thanks to change of pressure value on material step-by-step in time. Moulding is conducted in the course of time amounting to 0.7-1.0 of value of time of viscous-plastic state of material at pressing temperature under pressure amounting to 0.2-0.4 of value of optimum pressing pressure. Then pressing pressure is raised to optimum one and finally material solidifies under this pressure or after achievement of optimum pressing pressure in the course of 0.3-0.5 of degree of solidification of material. Then pressure is reduced to 0.2-0.4 of value of optimum pressure and solidification is performed under this pressure. EFFECT: reduced usage of materials, increased quality of articles, diminished power consumption, enhanced resistance of moulds. 2 cl, 2 tbl
SU3951868/05A1985-09-131985-09-13Process of manufacture of articles from thermoreactive fiber and powdery materials
SU1624860A1
(en)
Mould material for contact lens mould comprising polystyrene or polypropylene having a release agent impregnated therein; moulds; preparation of contact lenses
An active hydrogen-containing composition which provides mold release properties to a molded article, an internal mold release composition for preparnng the active hydrogen-containing composition, and a process for preparing molded polymeric products from the active hydrogen-containing composition