Disclosed are a method, an extruder and an injection molding machine for manufacturing a clamping ring, solving problems that products produced by an extrusion method needs to be processed in two steps. The key point of technical solutions lie in a molding step of acting on a pipe member in a plastic melt state via a molding die set, to form a clamping ring from the pipe member; an injection mold injects plastic materials having memory properties through an injection gate to form a pipe member in the molding cavity, the pipe member comprises a clamping ring and a sealing film provided on one end of the clamping ring, the hydraulic mechanism drives a molding cutter to cut out a joint of the sealing film and the clamping ring in a plastic melt state, thereby a limit end is formed at one end of the clamping ring.

Disclosed are a method, an extruder and an injection molding machine for manufacturing a clamping ring, solving problems that products produced by an extrusion method needs to be processed in two steps. The key point of technical solutions lie in a molding step of acting on a pipe member in a plastic melt state via a molding die set, to form a clamping ring from the pipe member; an injection mold injects plastic materials having memory properties through an injection gate to form a pipe member in the molding cavity, the pipe member comprises a clamping ring and a sealing film provided on one end of the clamping ring, the hydraulic mechanism drives a molding cutter to cut out a joint of the sealing film and the clamping ring in a plastic melt state, thereby a limit end is formed at one end of the clamping ring.

Electrofusion tape and method for the production thereof for welding together with plastics pipes in particular for use in a fixed-point fastening, consisting of a jacket element preferably of an electrically insulating plastics material, at least one heating element of electrically conductive plastics material and at least two contact elements for supplying electricity to the heating element, wherein the jacket element and the heating element take the form of tapes, wherein the jacket element surrounds the heating element at least in part, wherein the contact elements are arranged in the mutually opposing marginal regions of the heating element and extend parallel to one another along the heating element.

The invention relates to a plug connection between two tubular workpieces (1, 2) which are made of concrete and each of which has an inner liner (5) made of plastic, one of which forms a tip end (3) and the other a socket end (4) receiving the tip end (3), wherein the inner liners (5) have circumferential sealing flanges (12) which cover the end face (13) of the tip end (3) or the socket face (14) and wherein a joint seal (16) is provided between the sealing flanges (12). In order to provide advantageous structural conditions, it is proposed that the inner liners (5) are provided with a circumferential elastomer angled profiled section (8, 9) at the end face, which receives the circumferential edge of the inner liner (5) in an end-face profiled groove (11) of its axially parallel limb (10) and whose limb at a right angle to the axis forms the sealing flange (12).

The invention relates to a plug connection between two tubular workpieces (1, 2) which are made of concrete and each of which has an inner liner (5) made of plastic, one of which forms a tip end (3) and the other a socket end (4) receiving the tip end (3), wherein the inner liners (5) have circumferential sealing flanges (12) which cover the end face (13) of the tip end (3) or the socket face (14) and wherein a joint seal (16) is provided between the sealing flanges (12). In order to provide advantageous structural conditions, it is proposed that the inner liners (5) are provided with a circumferential elastomer angled profiled section (8, 9) at the end face, which receives the circumferential edge of the inner liner (5) in an end-face profiled groove (11) of its axially parallel limb (10) and whose limb at a right angle to the axis forms the sealing flange (12).

Disclosed are a method, an extruder and an injection molding machine for manufacturing a clamping ring, solving problems that products produced by an extrusion method needs to be processed in two steps. The key point of technical solutions lie in a molding step of acting on a pipe member in a plastic melt state via a molding die set, to form a clamping ring from the pipe member; an injection mold injects plastic materials having memory properties through an injection gate to form a pipe member in the molding cavity, the pipe member comprises a clamping ring and a sealing film provided on one end of the clamping ring, the hydraulic mechanism drives a molding cutter to cut out a joint of the sealing film and the clamping ring in a plastic melt state, thereby a limit end is formed at one end of the clamping ring.

Disclosed are a method, an extruder and an injection molding machine for manufacturing a clamping ring, solving problems that products produced by an extrusion method needs to be processed in two steps. The key point of technical solutions lie in a molding step of acting on a pipe member in a plastic melt state via a molding die set, to form a clamping ring from the pipe member; an injection mold injects plastic materials having memory properties through an injection gate to form a pipe member in the molding cavity, the pipe member comprises a clamping ring and a sealing film provided on one end of the clamping ring, the hydraulic mechanism drives a molding cutter to cut out a joint of the sealing film and the clamping ring in a plastic melt state, thereby a limit end is formed at one end of the clamping ring.

Disclosed are a method, an extruder and an injection molding machine for manufacturing a clamping ring, solving problems that products produced by an extrusion method needs to be processed in two steps. The key point of technical solutions lie in a molding step of acting on a pipe member in a plastic melt state via a molding die set, to form a clamping ring from the pipe member; an injection mold injects plastic materials having memory properties through an injection gate to form a pipe member in the molding cavity, the pipe member comprises a clamping ring and a sealing film provided on one end of the clamping ring, the hydraulic mechanism drives a molding cutter to cut out a joint of the sealing film and the clamping ring in a plastic melt state, thereby a limit end is formed at one end of the clamping ring.

Disclosed are a method, an extruder and an injection molding machine for manufacturing a clamping ring, solving problems that products produced by an extrusion method needs to be processed in two steps. The key point of technical solutions lie in a molding step of acting on a pipe member in a plastic melt state via a molding die set, to form a clamping ring from the pipe member; an injection mold injects plastic materials having memory properties through an injection gate to form a pipe member in the molding cavity, the pipe member comprises a clamping ring and a sealing film provided on one end of the clamping ring, the hydraulic mechanism drives a molding cutter to cut out a joint of the sealing film and the clamping ring in a plastic melt state, thereby a limit end is formed at one end of the clamping ring.

The invention relates to a plug connection between two tubular workpieces (1, 2) which are made of concrete and each of which has an inner liner (5) made of plastic, one of which forms a tip end (3) and the other a socket end (4) receiving the tip end (3), wherein the inner liners (5) have circumferential sealing flanges (12) which cover the end face (13) of the tip end (3) or the socket face (14) and wherein a joint seal (16) is provided between the sealing flanges (12). In order to provide advantageous structural conditions, it is proposed that the inner liners (5) are provided with a circumferential elastomer angled profiled section (8, 9) at the end face, which receives the circumferential edge of the inner liner (5) in an end-face profiled groove (11) of its axially parallel limb (10) and whose limb at a right angle to the axis forms the sealing flange (12).