| Patent Number |
Title Of Patent |
Date Issued |
| 7329116 |
Double-webbed mandrel |
February 12, 2008 |
| An mandrel for extrusion of hollow bodies, such as, polyvinyl chloride (PVC) hard, compact, and foamed pipes, includes an inner collar, an outer collar, and a middle collar, each of the collars being radially joined by webs to the particular adjoining collar. Each interior web and exteri |
| 7122141 |
Method and system for dual co-extrusion |
October 17, 2006 |
| In a co-extrusion system, a primary extruder is connected to a primary flow director to direct the solid melt from the primary extruder to the co-extrusion assembly. A secondary extruder is connected to a secondary flow director to direct the melt from the secondary extruder to the c |
| 7077639 |
Spiral-webbed mandrel |
July 18, 2006 |
| An mandrel for extrusion of hollow bodies, such as, polyvinyl chloride (PVC) hard, compact, and foamed pipes, includes an inner collar and an outer collar, and webs radially joining the inner collar and outer collar. The webs can be arranged twisted and/or offset in radial direction. |
| 6946094 |
Adjustable sizing tube |
September 20, 2005 |
| There is provided a plastic extrusion sizing tube having a cylinder with a split along its length to allow for radial expansion and reduction of the sizing tube. The cylinder has holes to allow an extrusion within the cylinder to be drawn to the cylinder by a vacuum outside the cylinder. |
| 6793474 |
Method and system for dual co-extrusion |
September 21, 2004 |
| In a co-extrusion system, a primary extruder is connected to a primary flow director to direct the solid melt from the primary extruder to the co-extrusion assembly. A secondary extruder is connected to a secondary flow director to direct the melt from the secondary extruder to the c |
| 6769899 |
Independent X/Y flow adjustable extrusion die |
August 3, 2004 |
| An adjustable extrusion die shapes a melt into a non-circular cross-sectional profile form. The wall thickness of the profile is adjustable by moving two adjustment plates orthogonal to each other and transverse to the flow of the melt. Movement of each adjustment plate is restricted |
| 5628560 |
Double-screw extruder |
May 13, 1997 |
| A screw for a double-screw extruder has its flight defining an outer cone and an inner cone of different convergencies with the inner cone converging more steeply than the outer cone from the feed end to the exit end of the extruder. Where A is the outer diameter at the feed end, B is |
| 5198242 |
Rotary turret embosser |
March 30, 1993 |
| An embossing apparatus in an extrusion line for the production of sheet extrusions like vinyl siding, can include a revolver above the backing roll and supported in a pair of cradles so that selected embossing rolls can be juxtaposed with the backing roll and can define the embossing gap |
| 4967800 |
Secondary confinement pipe having segments with interlocking rib and groove joints and coextrude |
November 6, 1990 |
| A secondary confinement pipe is assembled from identical segments of extruded polyvinylchloride with tenon and groove formations along longitudinal edges enabling the segments to be interfitted. The joints are sealed by flexible synthetic resin coextruded with one of the formations a |
| 4911628 |
Triwall siding apparatus |
March 27, 1990 |
| Highly uniform three-layer extrusions generally of flat siding or panels, preferably of PVC are extruded in an apparatus having a flow block in which lateral extruders supply the upper and lower layer streams to respective curved flow passages running to outlets of a flow block while a |
| 4874306 |
Siding die |
October 17, 1989 |
| A siding die utilizes a lip defining the orifice and provided with a pair of lip members with mating formations at their opposite ends so that the lip members are forced together when end screws bridging the lip members are tightened. The formations include inclined surfaces of respectiv |
| 4867669 |
Safety air plug and extrusion apparatus using same |
September 19, 1989 |
| A safety plug for an extrusion apparatus for extruding pipe is provided with a valve opening when its tether to the extrusion die breaks. The valve can be formed by a disk on a rod which is axially displaceable in a tubular body having a flange forming a valve seat for the disk of the ro |
| 4856975 |
Coextrusion block, especially for the coextrusion of generally flat PVC articles, such as siding |
August 15, 1989 |
| A coextrusion block for siding communicates through respective separate circular inlets with two extruders at the inlet side of the coextrusion block while, at the outlet side, a curved kidney-shaped outlet is disposed about an inlet of acorn shape so that the outlets have boundaries lyi |
| 4846648 |
Triple-wall foam coextrusion apparatus |
July 11, 1989 |
| A triple-wall foam coextrusion apparatus in which inner and outer layers of one synthetic resin material are coextruded with an intermediate layer of another synthetic resin material, and wherein the passages for the first material are inclined to the axis along which the second material |
| 4731002 |
Triple-wall foam coextrusion apparatus |
March 15, 1988 |
| A triple-wall foam coextrusion apparatus in which inner and outer layers of one synthetic resin material are coextruded with an intermediate layer of another synthetic resin material, and wherein the passages for the first material are inclined to the axis along which the second material |
| 4541270 |
Apparatus for testing plastic compositions |
September 17, 1985 |
| An apparatus for the laboratory testing of plastic compositions as to their extrudability comprises a housing with two mutually parallel, intersecting cylindrical bores occupied by two counterrotating plasticizing screws each having two sections with threads of mutually opposite pitch se |
| 4509907 |
Extrusion head for tubular bodies and hollow profiles |
April 9, 1985 |
| An extrusion head for producing hollow profiles such as thick-wall large diameter PVC pipe has its flow channel divided by a hollow mandrel into two coaxial portions of a flow cross section greater than that of the common portion of the flow channel downstream of these coaxial portions |
| 4487508 |
Extruder provided with preheating stage |
December 11, 1984 |
| An extruder for polymeric materials, comprising a housing forming a mastication stage with one or more feedscrews, includes a preheating and premixing stage with a cylindrical chamber centered on a vertical axis which is eccentrically traversed by a supply passage for the feeding of |
| 4408888 |
Double-worm extrusion press |
October 11, 1983 |
| A double-worm press, especially an extrusion or plastifying press for thermoplastic materials and particularly high viscosity thermoplastics, has generally conical worms, at least the discharge zones of which are formed so that the material is treated generally adiabatically therein. |
| 4385883 |
Preheated extruder |
May 31, 1983 |
| An extruder for thermoplastic or elastomeric materials has a mastication stage with one or more feedscrews preceded by a preheating zone in which the incoming bulk material is circulated and possibly recirculated by two screw-type conveyor members or augers in a loop within a heated exte |
