Device for the injection moulding of plastic objects...

Details Device for the injection moulding of plastic objects... Device for the injection moulding of plastic objects...

B - Operations, Transporting

29

C

B29C 45/17 (2006.01)

Patent

CA 2145756

The proposal is for a device for injection moulding plastic items enclosing hollow spaces with which a further pressurised medium like air, gas or a fluid can be introduced through a hollow needle (5) at a point differing from the nozzle into a mould (1), the mould hollow or cavity (4) of which can be filled with molten pastic through a nozzle. There is a needle core (9) which can be moved axially to a limited extent in the hollow needle (5) and it is possible via this needle core (9) to vary the cross-section of or open and close the aperture (16) of the hollow needle (6) opening into the mould hollow or cavity (4). The needle core (9) bears a thickened head or plate (10) in front of the end of the aperture in the hollow needle, the outside diameter of which corresponds at least approximately to the outside diameter of the hollow needle, so that it forms, with the aperture end (6) of the hollow needle (5), a radially directed splitting valve. In relation to the hollow needle (5), the needle core (9) is axially supported by spring means (23). It is important here that these spring means (23) continuously engage with the needle core (9) in the closing direction of the aperture of the splicing valve (16) and that the needle core (9) can be moved against the spring means (23) in the opening direction by a remote-controlled driving device (17, 18).

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