Abstract A mouldable synthetic resin colouring material in the form of sand-like particles each consisting of a fine powder of a colouring agent bonded to the surface of a particle of a synthetic resin powder used as nuclei, and therefore, easy to handle; and an automatic feeder for feeding both synthetic resin and the colouring material to a synthetic resin melting apparatus. The synthetic resin powder used as nuclei is a 10-80 mesh powder of a thermoplastic resin, for example, of polystyrene, polyethylene, polypropylene, polyvinyl chloride, polyester or xylene resin. The automatic feeder for a synthetic resin melting apparatus comprises a first hopper for feeding a resin material to be coloured and a second hopper for feeding a colouring material disposed in or adjacent said first hopper and having a colouring material metering small screw therein, whereby the resin material and colouring material are directly fed into the melting apparatus mixed and melted above a main screw of the melting apparatus.
AN AUTOMATIC FEEDER FOR A RESIN MELTING APPARATUS HAVING MAIN SCREW MEANS ENCLOSED BY A CYLINDER AND HEATING MEANS SURROUNDING SAID CYLINDER FOR CONVEYING, COMPRESSING AND MELTING THE RESIN MATERIAL FED THERETO, COMPRISING FIRST HOPPER MEANS FOR FEEDING A RESIN MATERIAL TO BE MELTED AND SECOND HOPPER MEANS FOR FEEDING A COLOURING MATERIAL DIRECTLY TO SAID MAIN SCREW MEANS, SAID SECOND HOPPER MEANS INCLUDING A HOPPER ELEMENT AND A SMALL SCREW DISPOSED IN A COLOURING MATERIAL PASSAGE FORMED AT THE LOWER END OF SAID HOPPER ELEMENT IN COMMUNICATION WITH THE CYLINDER.
Claim 2
Dependent Claim
91 words
AN AUTOMATIC FEEDER FOR A RESIN MELTING APPARATUS HAVING MAIN SCREW MEANS ENCLOSED BY A CYLINDER AND HEATING MEANS SURROUNDING SAID CYLINDER FOR CONVEYING, COMPRESSING AND MELTING THE RESIN MATERIAL FED THERETO, COMPRISING FIRST HOPPER MEANS FOR FEEDING A RESIN MATERIAL TO BE MELTED AND SECOND HOPPER MEANS FOR FEEDING A COLOURING MATERIAL DIRECTLY TO SAID MAIN SCREW MEANS, SAID SECOND HOPPER MEANS INCLUDING A HOPPER ELEMENT AND A SMALL SCREW DISPOSED IN A COLOURING MATERIAL PASSAGE FORMED AT THE LOWER END OF SAID HOPPER ELEMENT IN COMMUNICATION WITH THE CYLINDER.
Claim 3
Dependent Claim
39 words
An automatic feeder for a resin melting apparatus as claimed in claim 1, wherein said second hopper means is provided in said first hopper means, said screw positively controlling and metering the discharge of coloring material to said cylinder.
Claim 4
Dependent Claim
43 words
An automatic feeder for a resin melting apparatus as claimed in claim 1, wherein said second hopper means is provided exteriorly forwardly of said first hopper means with respect to the main screw and said passage is extending tangentially of said main screw.
Claim 5
Dependent Claim
60 words
An automatic feeder for a resin melting apparatus as claimed in claim 1, wherein said melting apparatus is a screw type injection moulding apparatus and said feeder further comprises control means for controlling the operation thereof such that the small screw is driven a predetermined number of turns and stopped, after each time the main screw is set in motion.
Claim 6
Dependent Claim
79 words
An automatic feeder for a resin melting apparatus as claimed in claim 1, wherein said melting apparatus is a screw type extrusion moulding apparatus and said feeder further comprises control means for controlling the operation thereof such that the small screw is driven at a rate of speed to feed the colouring material at a rate proportional to the rate of extrusion of the resin material by the main screw, throughout the period of rotation of said main screw.