| Patent application number | Description | Published |
|---|
| 20090091055 | METHOD AND APPARATUS FOR PRODUCING PIPES HAVING A TRANSVERSE PROFILE FROM THERMOPLASTIC MATERIAL - In a method and an apparatus for producing pipes having a transverse profile from thermoplastic material, mold segment halves are used on a molding path and are circulated in pairs. A main conveying device is provided for returning the mold segment halves, the main conveying device being designed like a gantry crane. A conveying bridge encompassing the molding path is provided with two conveying carriages which are displaceable at right angles to a direction of production and in opposite directions relative to each other and to which is in each case attached a downwards facing conveying arm comprising a holding device for in each case one mold segment half. Downstream of the downstream end of the molding path are provided parking positions for additional mold segment halves. Disposed downstream of the molding path is an auxiliary conveying device which is provided for removing the additional mold segment halves from the molding path in order to subsequently return them to the parking positions. | 04-09-2009 |
| 20090098231 | APPARATUS FOR THE MANUFACTURE OF COMPOUND PIPES - An apparatus for the manufacture of compound pipes with an oval cross-section is equipped with mould halves which advance in a direction of production and of which two at a time combine as a pair on a moulding path to form one mould. An injection head of at least one extruder is arranged upstream of the moulding path. An external nozzle used for the creation of an external tube is substantially circular in shape and is located at a distance upstream of the moulding path. An internal nozzle with a cross-section similar to the oval cross-section of the pipe to be created is located inside the moulding path. When entering the moulding path, the external tube extruded through the external nozzle is expanded in one direction and pressed together in a direction which is perpendicular to the former. | 04-16-2009 |
| 20090136608 | APPARATUS FOR CONTINUOUS PRODUCTION OF A COMPOSITE PIPE WITH A PIPE SOCKET - An apparatus for continuous production of a composite pipe comprises half shells which combine in pairs to form a molding path, wherein at least in one pair of half shells is formed a socket recess which has an extension b when seen in the conveying direction. Furthermore, an extrusion head is provided, with an outer die and an inner die leading out thereof, the outer die and the inner die having a distance a from each other when seen in the conveying direction. The distance a of the inner die from the outer die with respect to the extension b of the socket recess in the conveying direction is such that a≧b applies. | 05-28-2009 |
| 20090236032 | METHOD OF CONTINUOUSLY MANUFACTURING A COMPOUND PIPE COMPRISING A PIPE SOCKET AND APPARATUS FOR IMPLEMENTING THE METHOD - During the manufacture of a compound pipe, which is composed of an internal tube and a corrugated external tube, a slight overpressure relative to atmospheric pressure pa is applied to the inside of the internal tube, which is guided across a calibrating mandrel during the manufacture. At the transition to the formation of a pipe socket, a partial vacuum p3 relative to atmospheric pressure pa is temporarily applied the internal tube. | 09-24-2009 |
| 20100102489 | 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 smooth internal tube is welded together with the external tube which is provided with transverse grooves. At the transition from the normal compound pipe to the expanded pipe socket, the extruder speed of the first extruder is increased from a speed n1,1 to a speed n1,2. During the production of the pipe socket, the speed of the first extruder is reduced to a speed in1,3, wherein n1,2>n1,3>n1,1 applies. | 04-29-2010 |
| 20100269945 | METHOD OF AND APPARATUS FOR CONTINUOUSLY PRODUCING A TWIN-WALL PIPE COMPRISING PIPE SOCKET AND TWIN-WALL PIPE - 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 made for at least one overflow passage which interconnects the clearance between the external pipe and internal pipe in the vicinity of the transition portion and an adjacent elevation. a≧b refers to the radial height b of the overflow passage relative to its width a in the circumferential direction. | 10-28-2010 |
| 20120085498 | Apparatus for continuously producing a compound pipe comprising a pipe socket - During the manufacture of a compound pipe, which is composed of an internal tube and a corrugated external tube, a slight overpressure relative to atmospheric pressure pa is applied to the inside of the internal tube, which is guided across a calibrating mandrel during the manufacture. At the transition to the formation of a pipe socket, a partial vacuum p3 relative to atmospheric pressure pa is temporarily applied the internal tube. | 04-12-2012 |
