초록 ▼

The invention relates to a method of and apparatus for the manufacture of articles, for example of imitation tortoise-shell, by injection moulding, in which local masses of at least one material are embedded from place to place in at least one other material, said materials being respectively each d

The invention relates to a method of and apparatus for the manufacture of articles, for example of imitation tortoise-shell, by injection moulding, in which local masses of at least one material are embedded from place to place in at least one other material, said materials being respectively each delivered by a separate plastification unit and terminating at an injection mould through a single common discharge channel, said method comprising the steps of delivering said materials in continuous and simultaneous streams by means of said plastification units; breaking-up each continuous stream of material into a series of measured quantities of said material, the quantities of one of the streams being intercalated with the quantities of the other stream; and successively injecting each measured quantity into said mould while causing them to penetrate into each other. The injection of the materials into the mould is preferably effected transversely to the plane of movement of the materials. The apparatus for carrying this method into effect comprises a plurality of plastification units, each for a pre-determined material, these units being coupled to a rotating distributor and a single discharge channel in communication with the mould and with several groups of channels formed in said distributor.

대표청구항 ▼

Injection molding apparatus for molding articles having local masses of at least one material located here and there in at least one other material, said apparatus comprising a mold, a single passage in communication with the mold, a plurality of separate plastification units each adapted to deliver

Injection molding apparatus for molding articles having local masses of at least one material located here and there in at least one other material, said apparatus comprising a mold, a single passage in communication with the mold, a plurality of separate plastification units each adapted to deliver one of said materials, a distribution system located between the plastification units and the mold and adapted to deliver said materials from the units to said passage, said system comprising a plurality of channels isolated from each other, means for continuously communicating each of said channels with one of said plastification units so that each channel is fed with a continuous stream of material, means for directing the material from the channels to the single passage, and means for breaking up the stream of material in at least one of said channels into measured quantities so that at least one of the materials will be fed to said passage in an intermittent manner to thereby ensure intercalation of said material into at least one other material.