Injection moulding machines
AssigneeCrayonne Limited
InventorJohn Matthews
Life of this patent
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Abstract
An injection moulding machine has a reciprocable and rotatable screw which is water cooled internally. This enables the temperature of the machine to be precisely controlled. This further enables the required plasticization of the resin granules with limited mixing of the same, so that multi-color effects can be achieved. FIG. 5 shows the waterways in the screw and the rotating supply connections.
Claims3
An injection moulding machine for producing vari-coloured articles, comprising a barrel housing a reciprocable screw, means for heating the barrel to promote the flow of plastic material in contact with the inner surface of the barrel and a spreader fixed in the discharge end of the barrel for conducting heat from the barrel into the material to fuse the material passing through the spreader, the screw having an internal passage for conducting a cooling fluid to inhibit fusing and mixing of vari-coloured material carried between the flights of the screw.
A method of moulding vari-coloured articles in an injection molding machine having a barrel housing a reciprocable screw, comprising the steps of heating the barrel to promote the flow of plastic material in contact with the inner surface of the barrel, cooling the screw internally to inhibit fusing and mixing of vari-coloured material carried between the flights of the screw, and passing the material through a spreader fixed in the discharge end of the barrel to conduct heat from the barrel into the material to fuse the material without mixing it.
Dependencies are inferred from the claim text.