49807 ⎘
Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor; Component parts, details or accessories; Auxiliary operations; Means for plasticising or homogenising the moulding material or forcing it into the mould using screws; Axially movable screw; Non-return devices Abrasion resistant means in the screw head or non-return device