FIELD: metallurgy.
SUBSTANCE: injector contains hollow matrix allowing socket and at least jet orifice for plastic in the area of the mentioned socket, provided for feeding of molten plastic into mould, elongated bush, allowing jointly with inner heated wall of socket, with heated end, outfitted by discharge opening, which pass inside the socket and forms with this socket accumulative chamber, in which there are made channels. Accumulative chamber allows narrow section, which separates accumulative chamber on rear end and front element. Pipe installed around heated end, nearby jet orifice and not contacting to heated wall. Open end of pipe forms with heated walls of socket narrow section, at that pipe sweep one exhaust opening at the distance, which is required for providing spaces for plastic discharge. Additionally plastic stream, outgoing from the discharge opening, is in hollow matrix and passed to jet orifice.
EFFECT: reduction of beading formation and other invisible defects on the verge of moulding detail.
4 cl, 7 dwg
