Apparatus is disclosed for producing synthetic plastic sheet material having a multicolor striated pattern therein. The composite stream containing at least one band of differentially colored material in a matrix resin is passed through a perforated member having apertures therein separated by narrow solid segments which results in some interference with the lineal flow of the composite stream and effects striations of the differentially colored material within the matrix. A screen member supported in a perforated insert is specifically disclosed, and generally the bands of color extend diagonally across the sheet material.
A synthetic plastic sheet material having a multicolor striated pattern therein is disclosed. The synthetic plastic sheet material has a multiplicity of bands of differentially colored resin disposed within a matrix resin and the bands have striations extending longitudinally of the sheet material. Some of the bands extend angularly to others of the bands so as to provide a grid pattern. The bands of one angular orientation are disposed at a depth within the matrix material which is different from that of the bands of the other angular orientation. A multiplicity of bands of each orientation are provided across the width of the sheet material and the bands have relatively narrow striations extending longitudinally of the sheet material.
The invention relates to a process for injection molding articles having a number of layers of different plastic materials that are sequentially and/or coaxially injected, in plasticized form, into a mould. Prior to injection, the different plastic materials are brought into a hollow chamber in a preselected order and amounts, with the aid of separate injection units or by means of a distributor, which is made of elementary modules, each of which is capable of creating a certain combination and configuration of plastic materials in the chamber. The contents of the chamber are then injected into the mould.
This invention provides a method and apparatus for injecting an additive into a stream of homogenized plastics material. The apparatus includes a homogenizing means such as a screw conveyor for the plastics material and at least one injector for injecting an additive, usually a colorant, into the boundary layer only of the homogenized plastics material prior to the latter being subjected to mastication in a gear pump. The additive is injected into the plastics material at such a position in the boundary layer that as the material passes through the gear pump the additive is mixed substantially wholly with the boundary layer of plastics material and for this purpose the injection of additive is at a position such that it passes through the gear pump in the region of the intermeshing gears of the pump.
Readily disassembled and reassembled apparatus for extruding composite food products, especially simulated slab bacon, includes an extrusion assembly comprising a die having a housing within which extend a plurality of individual die conduits from a front wall provided with openings leading into the die conduits. The space surrounding the die conduits within the housing form die passages interleaved with the die conduits. Means are provided for extruding a food material through the front wall openings and through the die conduits into a convergent discharge conduit removably attached to the housing. Separable supply conduits connect a pressure source of supply of a different food material with the housing at opposite sides thereof as well as between such opposite sides. The supply conduits include an elongate manifold conduit extending transversely of the housing, a pair of substantially semi-circular conduit fittings for connecting opposite ends of the manifold conduit with the opposite sides of the housing, respectively, and at least one conduit for connecting the manifold conduit intermediate its ends with the housing between the opposite sides thereof.
A process for creating color effects in extrudable material, such as plastic. The process includes the steps of providing a first flow of viscous material of a first color and a second flow of viscous material of a second color, the second color being different from the first color. Next, the first and second flows are combined to form a stream of viscous material, where the stream is characterized by a first band of the first color and a second band of the second color, the second band being adjacent to the first band. The stream of viscous material is fed through a static mixer such that, upon exiting the static mixer, the stream is further characterized by a third band of a third color, the third color being different from the first and second colors, the third band being located between the first and second bands.
