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| Number | Title | Issue Date |
| 8178034 | Method and device for the continuous production of a plastic compound pipe comprising a pipe socket Into a molding path moving in a direction of conveyance is extruded an internal tube from a first extruder and an external tube from a second extruder, the external tube being concentric with the internal tube. During the production of a normal compound pipe, the sm... | 05/15/2012 |
| 7691317 | Method and device for manufacturing a double-walled, thermoplastic tube with a connecting sleeve In at least one method for manufacturing a double-walled, thermoplastic tube with a connecting sleeve, which enables precise and complete moulding of the connecting sleeve by simple means, it is provided that a) a first tube (1) is extruded into a mould tunne... | 04/06/2010 |
| 7357968 | Reinforced, high pressure, low permeation multilayer hose A reinforced, high pressure hose is disclosed for use in the transport of high pressure fluids. The hose includes a multilayered inner tube capable of prolonged exposure to fluids such as those containing hydrocarbons, and a reinforcement layer overlaying the inner ... | 04/15/2008 |
| 7311509 | Externally cooled moving mold A molding apparatus includes a moving mold for shaping molten plastic into product made within the moving mold. The moving mold is surrounded by an air block housing to define a cooling chamber exteriorly around the moving mold. At least one heat exchanger is locate... | 12/25/2007 |
| 7267535 | Pipe molding apparatus with mold tunnel air turbulence An extruding apparatus which extrudes continuous length of hollow plastic product has an extruder (3) which feeds molten plastic through die equipment (5) to a mold tunnel (7) formed by side by side moving mold blocks (9). The apparatus i... | 09/11/2007 |
| 7264764 | Method of manufacturing branching pipe The manufacturing method of the invention manufactures a fuel filler pipe (branching pipe), where a breather pipe is branched off from a filler pipe main body. The manufacturing method extrudes a first extruded tubular member and a second extruded tubular member, co... | 09/04/2007 |
| 7238317 | Method of continuously producing a twin-wall pipe with a ventilation zone between a socket and an adjacent elevation A twin-wall pipe comprises an internal pipe and an external pipe. The external pipe is corrugated, having elevations and troughs. The twin-wall pipe is further provided with a socket. In a transition portion towards the twin-wall pipe and the socket, provision is ma... | 07/03/2007 |
| 7175896 | Composite having two or more layers, including an EVOH layer A layered composite contains the following layers: (I) a layer I composition containing (a) from 0 to 80 parts by weight of at least one polyamide; (b) from 0 to 100 parts by weight of at least one polyamine-polyamide copolymer; and (c) from 0 to 80 parts by weight ... | 02/13/2007 |
| 7163388 | Method and apparatus for incorporating lumens into the wall of a tubular extrusion A polymer extrusion head for forming continuous shapes having one or more lumens therein. The head includes an extrusion mandrel and die. At least one lumen pipe is disposed radially through a port in the die to intersect the polymer flow in the annular region betwe... | 01/16/2007 |
| 7128860 | Production of composite insulators by injecting different screens onto an insulator shank The invention relates to the production of composite insulators consisting of a shank in the form of a bar or a tube, which is provided with a covering and which comprises plate-like screens which are distanced from each other. The covering and the screens are made ... | 10/31/2006 |
| 7118369 | Corrugated pipe plant The present invention relates to an apparatus for the manufacture of corrugated pipes from thermoplastic in which mould segment halves, which complement one another in pairs, are guided together in a circuit along a mould path adjacent to an injection head, are move... | 10/10/2006 |
| 7104777 | Pipe mold with compensation for pipe shrinkage Pipe molding apparatus having a moving mold tunnel includes an upstream and at least one downstream mold block. Each mold block comprises mold block sections which close with one another to form the pipe and which open relative to one another to release the pipe. Th... | 09/12/2006 |
| 7096872 | Ear plugs and method of forming same A process for forming a foamed thermoplastic earplug, comprising the steps of extruding a foamed body of thermoplastic material; shaping the foamed thermoplastic material; and at least partially separating the resulting shaped material for forming individual earplug... | 08/29/2006 |
| 7089965 | Pipe for transporting automobile fluids, comprising a smooth inner tube and an annellated outer tube A pipe for transporting automobile fluids includes a smooth inner tube (1) based on a fluorinated thermoplastic material, a corrugated outer tube (2) in contact with the inner tube via the inside peaks (3) of its corrugations, and made of a poly... | 08/15/2006 |
| 6986862 | Method of making three-fold bellows and an arrangement for carrying out the method A vulcanization mold (2) includes several segments (8a, 8b; 10a, 10b; 12a, 12b; 14a, 14b) which define two end profiles (8, 10) and two inne... | 01/17/2006 |
| 6951336 | Method of manufacturing a boot seal The present invention resides in a boot seal for use in sealing a joint. The joint comprises first and second relatively movable parts. The boot seal is configured in the form of a sleeve to extend between and around the vehicle relatively movable parts. The sleeve ... | 10/04/2005 |
| 6948528 | Corrugated hose assembly According to the present invention, there is provided a hose assembly with an inner fluoropolymer layer having a smooth inner surface and an outer polyamide layer having an undulated surface. ... | 09/27/2005 |
| 6946094 | Adjustable sizing tube 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... | 09/20/2005 |
| 6939503 | Method and apparatus for the manufacture of pipes of thermoplastics with transverse profile features A method and an apparatus for the manufacture of pipes of thermoplastics with transverse profile features comprises mold segment halves which are circulated by twos on a molding path. A conveying device of the type of a gantry crane is provided for recirculation of ... | 09/06/2005 |
| 6905325 | Pipe mold with compensation for pipe shrinkage Pipe molding apparatus having a molding mold tunnel includes an upstream (3) and at least one downstream mold block (7). Each mold block (3, 5, 7) comprises mold block sections which close with one another to form the pipe and which open relativ... | 06/14/2005 |
| 6884374 | Suction control in a suction/blowing mold system A plastic hollow preform is drawn through a mold passage formed in a closed mold by applying a generally constant suction to a downstream end of a conduit having an upstream end connected to an output end of the mold passage. A flow cross section of the conduit is v... | 04/26/2005 |
| 6764627 | Method of making corrugated part A method for continuously forming molded parts includes providing an extruder; directing a hollow column of plastic material from the extruder; providing a plurality of die blocks each including planar end segments having differing geometry and joined by the interme... | 07/20/2004 |
| 6752955 | Method of manufacturing a boot seal In a process and an apparatus for making a plastic sleeve (56), plastic is fed into an extruder die (216). The plastic is extruded from the extruder die (216) as a molten plastic stream into a mold cavity (272) having an inner wall (27... | 06/22/2004 |
| 6719942 | Method and apparatus for production of tubing A method and apparatus for producing an extruded product includes a machine that cooperates with an extruder. The machine is commonly used as a corrugator and the extruded product is often corrugated piping. The machine has a frame supporting a trackway in a continu... | 04/13/2004 |
| 6682689 | Flexible plastic article and method of manufacturing the same A process for making a plastic tube having a variable diameter comprises the following steps. A plastic is obtained. The plastic is fed into an extruder die (216). The plastic is extruded as a tubular molten plastic stream (262) into a mold cavity (218) h... | 01/27/2004 |
| 6676881 | Apparatus for producing multiple channel duct assembly and method thereof The present invention resides in that a plurality of pre-molded inner ducts are fed to a cross-head die, and a melted outer duct is extruded around the inner ducts from the cross-head die, and then the pre-molded inner ducts and a melted outer duct are su... | 01/13/2004 |
| 6672324 | Method of manufacturing branched pipe, pipe manufacturing apparatus and branched pipe A branched pipe (5) is manufactured by continuous extrusion in such a manner that a manifold (5a) of a branched pipe (5) is manufactured by extruding plastic material into the space defined by moving chill moulds (1, 2) and a mandrel (10) arranged therein... | 01/06/2004 |
| 6576180 | Process for the production of corrugated plastic tubes In a process for the production of corrugated plastic tubes an extrusion device passes plastic material into a perpendicularly arranged injection head for injecting the plastic material into a perpendicularly arranged mold section comprising at least two ... | 06/10/2003 |
| 6555243 | Thermoplastic multilayer composites Thermoplastic multilayer composite, particularly in the form of a multilayer hose, a multilayer pipe or a multilayer container, containing at least one intermediate layer made of a molding compound on the basis of ethylene/vinyl alcohol copolymers between... | 04/29/2003 |
| 6458311 | Method for the continuous manufacture of a twin-wall pipe having a pipe socket For the continuous manufacture of a twin-wall pipe having a pipe socket and consisting of a smooth internal tube and an external tube, which is welded together therewith and provided with transverse grooves, two extruders are provided, which extrude an ex... | 10/01/2002 |
| 6447709 | Process for producing resinous hose Bellows-shaped pleats are formed by a corrugator on bellows portions of a cylindrical hose formed by extrusion from a thermoplastic resin. The height of the pleats of the hose is uniform in a circumferential direction, and the numbers of the pleats on the... | 09/10/2002 |
| 6399002 | Method of making a pipe with coupling conforming to pipe diameter A plastic pipe has a multiple layer wall construction including major and minor wall portions. The major wall portions are formed with first corrugations and are separated from one another by the minor wall portions which are formed with second corrugatio... | 06/04/2002 |
| 6372161 | Operation of a mold block with air flow control A mold block which is used in a moving mold tunnel comprises first and second mold block sections which meet at their parting faces to close the mold block. Each mold block section has a product shaping interior surface and an air movement passage having ... | 04/16/2002 |
| 6355358 | Multilayer composite A thermoplastic multilayer composite, and articles made therefrom, which has at least one layer I of a thermoplastic molding composition, at least one layer II of a further thermoplastic molding composition, bonded together with at least one layer of an a... | 03/12/2002 |
| 6235232 | Synthetic resin hose and method for producing the same A producing method of a hose including, using a mold assembly constituted by a pair of semicylindrical molds each having a large number of intrusion grooves formed along the axial direction in the cylindrical surface of each of the semicylindrical molds s... | 05/22/2001 |
| 6102078 | Rubber tubing with axially spaced annularly corrugated flexible segments A process for making a length of rubber tubing with axially spaced circumferentially corrugated flexible segments from a sleeve of uncured rubber and the product resulting therefrom. An end length of a sleeve of uncured rubber is placed over an end portio... | 08/15/2000 |
| 6054089 | Method and apparatus of cooling product within a mold A method of forming a plastic product comprises extruding molten plastic into a mold having a mold wall with product shaping interior face. After shaping the product in the mold, the method includes introducing gas via a gas inlet through the mold wall on... | 04/25/2000 |
| 5975143 | Method for manufacturing a corrugated pipe, and a corrugated pipe manufactured by the method The invention relates to a method for manufacturing a multi-layer corrugated pipe and to a corrugated pipe manufactured by the method and comprising an inner tube (2), a corrugated outer tube (5) and a plastic layer therebetween. Separate layers (3,6) of ... | 11/02/1999 |
| 5827468 | Turning calibration apparatus and process Convoluted tubing of thermoplastic resin is made by extruding the resin as a molten tubular extrudate, feeding said extrudate into the interior of a rotating tubular member which has a helical thread in the interior of said member, the spiral thread havin... | 10/27/1998 |
| 5824351 | Molding apparatus with non-reflective mold tunnels A plastic part forming apparatus includes a mold tunnel into which molten plastic is fed to form the plastic part. The mold tunnel is made from thermally conductive material and has a part shaping interior face which is non-reflective such that the interi... | 10/20/1998 |
