Cosden Technology, Inc.

Co-exx Pipe Company, Inc.

Co-ex Pipe Company, Inc.

Jackie D Murley

Granville J Hahn

Raleigh N Rutledge

Marion Johnson

Carl Blanchard

Apparatus for making injection molded polymeric articles, comprising a vibratory pneumatic cooling assembly adapted to dissipate thermal energy from the polymeric articles after they are ejected from the mold cavities through use of an oscillating perforated vibratory grid adapted to maintain the articles in relative motion while at least partially supporting them on a substantially uniform cushion of air. A method for employing the apparatus of the invention to substantially reduce the cycle time required for injection molding polymeric articles is also provided.

Method for handling and cooling injection molded polymeric articles

An injector device for use in forming multilayer extrusions of plastic resins and a method for forming such extrusions. The apparatus includes an injector member that divides the extrudate from the first extruder into two layers and receives at least one extrudate from an additional extruder that is interposed by the injector member between the divided layers of the extrudate from the first extruder. The process includes producing plasticized resin by a first extruder, dividing the extrudate into two layers, producing extrudate from a second extruder, and injecting such extrudate between the two layers of the first extrudate.

Apparatus for forming multilayer thermoplastic resin extrusions

The process for making thin wall containers from plastic resins described herein includes the step of heating the resin, placing the resin between a product mold and a preform mold, and closing the molds thereon. It also includes the steps of applying a differential pressure across the resin to force the resin into the preform mold and applying pressure on a movable piston in the preform mold that forces the resin relatively into the product mold. As pressure is applied internally of the product being formed, the container is shaped in the desired configuration and during such formation, is biaxially oriented to improve the strength characteristics of the container.

Process for making a thin walled container from a plastic resin

The apparatus for making thin-walled containers from plastic resins includes a heater for raising the temperature of the resin sheet, a product mold and a preform mold located in axial alignment and movable relative together. The preform mold includes a reciprocal piston that is arranged, when the molds are closed on the resin sheet, to be moved in response to fluid pressure to force the sheet into the product mold while gas pressure is applied to the interior of the sheet to force the resin sheet into the final product configuration. The elongation of the sheet by the piston and the radial deformation caused by the gas, biaxially orient the material to increase the strength of the container.

Apparatus for making a thin walled container from a plastic resin

Apparatus for injection molding polymeric articles

An apparatus for the formation of a multiple layered pipe comprising a die housing having a bore therethrough with a mandrel longitudinally supported within the bore by a spider to provide an annular extrusion passageway defined by the inside surface of the housing and the outer surface of the mandrel. The mandrel comprises a series of sequentially positioned annular feed rings for the laydown of thermoplastic material on the inner surface of the main thermoplastic material flowing thereover through the extrusion passageway. The extrusion passageway is constricted downstream of the spider but prior to the annular sequentially positioned feed rings to reunite the thermoplastic material after the flow disruption created by the spider. Also included in the mandrel is a longitudinal passageway in communication with the inlet section of the bore for the transportation of thermoplastic material therethrough to one or more of the annular feed rings. The mouth of the mandrel bore includes a restrictor orifice therein to balance the pressure differential created therein by the constriction in the extrusion passageway.

Coextrusion apparatus for producing multiple layered thermoplastic pipe

A process is disclosed for the coextrusion of a multi-layered tube whereby at least one stream of molten polymer from a single-screw extruder is passed through a die; wherein the stream is divided into two concentric streams which are balanced by varying the area of a restrictor orifice placed in the central stream. Spider lines in the outer molten stream are eliminated by the use of a second restrictor means used downstream of an open chamber for reuniting the melt, which chamber is downstream of the spider legs.

Coextrusion process for producing multiple layered thermoplastic pipe

Disclosed is a process and apparatus for extrusion of multiple-layer sheeting comprising an improved co-extrusion feedblock and valve plate for laying down co-extruded resin streams onto a main extruded polymeric resin. The new design provides advantageous external control of the layer number as well as a more refined control of layer thicknesses.

Multiple-layered sheeting apparatus

Disclosed is an apparatus and process for producing multiple-layer film or sheeting which includes an improved laydown means comprising adjustable cam-actuated control means for controlling the polymer flow and individual layer thickness.

Growing community of inventors

Big Spring, TX, United States of America

Jackie D Murley