Abstract: A method for producing a tube section from thermoplastic material, in which a tube section is extruded by means of an extruder which is provided with an extruder die having an inner core, which inner core defines an axial hollow space in the tube section, the tube section coming out of the extruder die downstream of the extruder die being internally cooled by means of an internal cooling member and externally cooled by means of an external cooling device. Immediately after the tube section leaves the extruder die, the internal cooling member brings about internal cooling of the tube. The external cooling device is positioned downstream of the internal cooling member, so that the external cooling of the tube section is brought about after the internal cooling.

Abstract: A pipe of layers of thermoplastic polyolefins of the same type, however with different properties, which are connected inseparably with one another, an outer first layer and a second layer, adjoining the first layer on the inside, consisting of a material, which has not been cross-linked, the second layer approximately having the FNCT the value or the NPT value of a one-layer standard pressure pipe and the first layer having an FNCT or NPT value, which is higher by a factor of at least 3 than that of the second value. Moreover, a third layer is provided, which adjoins the second layer on the inside, also consists of material that is not cross-linked and has a PNCT, which is higher by a factor of at least 3 than that of the second layer and an NPT layer, which is higher by a factor of at least 2 than that of the second layer.

Abstract: A tapping apparatus having a drilling device for producing an outlet on a medium-carrying pipeline, on which a tapping fitting is arranged, and having a drive and advance device for driving and advancing a drilling tool is proposed, a coupling and uncoupling mechanism being arranged for coupling and uncoupling the drive device to and from the advance device for the drilling tool. The tapping apparatus is of modular construction, can be dismantled into individual parts and is easy to operate.

Abstract: A method of forming a socket on a pipe of thermoplastic material is disclosed. In the process, an end section of the pipe is heated in a heating station. Then, the pipe is transferred to a socket-forming station having a socket-forming mandrel. This is followed by the socket-forming mandrel being introduced into the pipe end section, heated to a suitable socket-forming temperature, and the end section being formed into a socket. Prior to the pipe end section being heated in the heating station, a support is introduced into the end section in order to internally support the end section. The support remains in the end section after the socket-forming mandrel is introduced into the pipe and in the process the support is pushed deeper into the pipe.

Abstract: The invention relates to a device for injection molding a plastic object. The device comprises a frame with a first platen and a second platen, which are respectively designed for fixing thereto a first mould half and a second mould half of an injection mould.

Abstract: A coupler for a pipe or hose section has a coupling body, at least one coupling piece integrally formed therewith and a pressing sleeve, which can be previously joined to the coupling body. The coupling body and the pressing sleeve can be previously joined by a locking or interlocking connection.

Abstract: The invention relates to a method for forming an article comprising closed-cell microfoam from thermoplastic, wherein at least one molten thermoplastic comprising a foaming agent is subjected under pressure to a forming operation and, after the pressure has been at least partially released is cooled, wherein the amount of foaming agent is substantially identical to the amount corresponding to that quantity of gas released by the foaming agent which is comprised by a close-packed structure of the foam cells having a specific foam-cell diameter, substantially uniform throughout the foam, at the pressure prevailing during cool-down.

Abstract: Apparatus and method for producing a hollow plastic section by extrusion through a die in a horizontal direction. The die has an inner mandrel which forms the cavity in the section. A first sealing plug and a second sealing plug, which sealing plugs are situated at a distance from one another downstream of the inner mandrel are attached to the inner mandrel. The sealing plugs are designed, during operation of the apparatus, to lie in the hollow section, such that they are sealed against the section, so that the sealing plugs and the section delimit a compartment in the cavity of the section. The compartment is filled with a liquid during operation of the apparatus. Vent means are located in the compartment for receiving and discharging gases or vapor which collects at the highest point of the compartment.

Abstract: A plastic container of an essentially rectangular shape comprises a bottom, upright side walls connecting to the bottom and having essentially equal thicknesses, and an outward beaded top edge on which the edge of a cover which closes the container can be fixed. Each upright side wall is divided in the vertical direction of the container into two interconnecting side wall parts, the lower side wall part being made curved towards the inside of the container (concave), and the upper side wall part being made curved towards the outside of the container (convex), and the upper and lower side wall parts being connected to each other by an intermediate part. This produces a very stable container, which is suitable for storage and transportation of sensitive powdered materials.

Abstract: A pipe-drilling fitting for a medium-conveying pipe, comprising a housing which has a drilling stub, which can be fitted at an angle to the pipe axis, for drilling into the pipe wall, and a branch stub which is arranged at an angle to the drilling stub, a rotationally actuable cutting bush being arranged in the drilling stub, the cutting bush and the drilling stub having mutually complementary screw threads, and at least one sealing means for sealing the medium-conveying pipe with respect to the outside being provided between the drilling stub and the cutting bush, in which fitting the sealing means is arranged in the cutting bush on an external diameter which is significantly smaller than the internal diameter of the complementary screw threads.

Abstract: Method for treating an extruded plastic section having a hollow space and installation suitable for carrying out such a treatment. The installation includes an extruder which has a core for forming the hollow space in the section and, at a distance downstream from the extruder in the extrusion direction of the section, a closing means having a rigid circumferential wall. The installation also has a first conduit connected to a supply orifice which is provided in the circumferential wall of the closing means, a fluid feeder connected to the first conduit and a second conduit connected to a discharge orifice. The discharge orifice is upstream of the supply orifice to provide a fluid film flowing opposite to the extrusion direction between the circumferential wall of the closing means and the extruded section.

Abstract: A method for forming a socket on a pipe of biaxially oriented polyvinyl chloride including: placing a support in an end section of the pipe, heating the pipe in the region of the end section; deforming the pipe to produce a socket in the region of the heated end section, the heated end section being supported internally while the socket is being formed; cooling the pipe in the region of the end section, the end section being supported internally during the cooling operation; and removing the support from the pipe. For the purpose of heating the internally supported end section of the pipe, the end section is first heated until the end section has reached, substantially homogeneously, the glass transition temperature of polyvinyl chloride and is then further heated until the end section has reached, substantially homogeneously, a temperature near, preferably just above, the orientation temperature of polyvinyl chloride.

Abstract: The invention concerns a transport and storage container comprising a base (30) and four collapsible side walls (10, 20) and having the following features: two first side walls (10) have corner-embracing wall end regions (11); the corner-embracing wall end regions (11) and the two side walls (20) are designed with connection wall regions (12; 22) which overlap each other in the erected state; the base (30) is designed with two wall plinth regions (31) which form the lower part of the first side walls (10) and comprise corner-embracing plinth end regions (131), the corner-embracing length of the plinth end regions (131) being shorter than the corner-embracing length of the wall end regions (11); two second side walls (20) are designed with laterally projecting widenings (21) which lie at the level of the wall plinth regions (31) and, in the erected state of the side walls (10, 20), lie between the corner-embracing wall end regions (11) and the base (30); the pivot axes (18) of the first side walls (10) are dis

Abstract: Method and device for manufacturing biaxially oriented tubing from thermoplastic material. The method includes forcing the tube over a mandrel at an orientation temperature of the plastic material, which mandrel includes an expansion part which produces expansion in the circumferential direction of the tube, and downstream of the mandrel the exertion of an axial pulling force on the tube, in the course of which the tube encounters a resistance which counteracts the movement of the tube over the mandrel. The method also includes the exertion of an influence sector-wise in an adjustable manner in the circumferential direction of the tube on the resistance which counteracts the movement of the tube over the mandrel. In an advantageous embodiment, the temperature of the plastic material of the tube is influenced sector-wise in an adjustable manner, viewed in the circumferential direction of the tube. The measures according to the invention lead to better control over the manufacture of biaxially oriented tubing.

Abstract: A tube is extruded from a thermoplastic material and is then forced over a mandrel at an orientation temperature of the material. The mandrel has an expanding section that expands the tube in its circumferential direction. A tube speed controller upstream of the expanding section of the mandrel exerts an axial force on the tube, and a puller downstream of the mandrel exerts an axial pulling force on the tube. Upstream of the tube speed controller, an outer layer of a wall of the tube is brought to a temperature below the orientation temperature. That outer layer is thick enough to withstand the force exerted by the tube speed controller.

Abstract: A tubular profile made of thermoplastic material is formed by extrusion from an extruder. Downstream from the extruder, the tubular profile is cooled both externally and internally by an external cooling unit and an internal cooling unit mounted on the extruder. A tensile force is exerted on the cooled tubular profile downstream from the cooling units by a pulling device. When the extruder is set in operation to start the production of the tubular profile, the internal cooling unit is left out. When the pulling device applies the tensile force on the extruded and externally cooled tubular profile, the internal cooling unit is introduced into the tubular profile from the open end of the tubular profile and is mounted on the extruder.

Abstract: Method and devices for manufacturing biaxially oriented tubing from thermoplastic material. The method includes forcing the tube over a mandrel at an orientation temperature of the plastic material, which mandrel includes an expansion part which produces expansion in the circumferential direction of the tube. The forcing over the mandrel is achieved by exerting a pushing force on the tube upstream of the expansion part of the mandrel by a pushing device acting upon the outside of the tube, and by exerting a pulling force on the tube downstream of the mandrel. The pushing device acts upon the tube at a distance upstream of the mandrel, and the tube is supported between the place where said pushing device acts and the expansion part of the mandrel.

Abstract: A method for manufacturing biaxially oriented tubing from a thermoplastic material. The method includes forcing the tube over a mandrel at an orientation temperature of the plastic material, which mandrel is an expansion part which produces expansion in the circumferential direction of the tube. Downstream of the mandrel an axial pulling force is exerted on the tube, and the biaxially oriented tube is cooled down. At a distance downstream of the mandrel, the tube is drawn through a calibration opening bounded by a calibration device, the calibration opening being such that it produces a reduction in the external dimensions of the tube. Accurate regulation of the external dimensions of the tube is provided by regulating the distance between the mandrel and the calibration device, in particular depending on the external dimensions of the tube measured downstream of the calibration device.

Abstract: A thermoplastic saddle (6) for renovating or repairing a pipeline (1) with a branch pipe (2). The saddle comprises two saddle parts (20, 22) being movable with respect to each other. The first saddle part (20) comprises a flexible saddle plate (6') and a first connecting part (21) being integral therewith. The second saddle part (22) comprises a branch (8) provided with a second connecting part (23). The part (21) tapers towards its open free end (12') and the second connecting part has a spherical circumference (23a). The position of connecting parts (23, 23a) with respect to connecting part (21) ensures that branch (8) is retained in connecting part (21) if said branch is subjected to pulling forces. In a renovated or repaired pipeline (1) the saddle is fixed by fixing means preferably an expanded plastic fixing sleeve (13). However, fixation by a glued connection (112) and/or sealed connection (113) is also possible.

Abstract: A method is disclosed for the production of extruded plastic products by using an extruder (1) which has an extruder hopper (2) which is supplied with a hot mixture obtained by discontinuous mixing of PVC powder and aditives in a hot mixing zone, with the supply of frictional heat, wherein a first amount of PVC powder is mixed with an excess of additives with the supply of frictional heat, after which the mixture thus obtained is homogenised in the same mixing zone with a supplementary amount of PVC powder, in such a way that the final mixture has the desired concentration of additives, after which the hot mixture obtained after homogenisation is fed directly to the extruder hopper (2). An installation for the production of plastic products by extrusion, comprising a discontinuously operating hot mixer is also disclosed, as well as said hot mixer (3).