MANUFACTURE OF ARTICLES OF THERMOSETTING PLASTIC, MOLDS USED Russian patent published in 1995 - IPC

FIELD: manufacture of articles of thermosetting plastic. SUBSTANCE: method implies the plasticizing of material and its injection through heated pouring gates into heated spaces. The pouring gates in question have some zones whose temperature exceeds that of the zones of the mold where articles are formed. During injection, time and temperature of heating of these zones increase. As soon as injection is finished, the above time and temperature change to their original values. Movable and immovable half-molds are used for this technique. They have heating systems, shaping seats, independent heating gate system in the form autonomous ohm-based heating blocks made of carbon compounds, and cooling system. EFFECT: higher efficiency and reliability. 2 cl, 2 cl, 12 dwg