TH21118C3 - A continuous production method of double-walled pipes with pipe sockets and fittings for implementing the method. - Google Patents

Abstract

DC60 Continuous production of double wall tubing Which has a pipe socket (41) which consists of a smooth inner tube and an outer tube which are then welded together. And is provided with transverse grooves, forming machines Press out two machines This pushes out the external pipe (37) and the inner tube (39) through the cross-joint header (8). A switch (50, 51, 56, 57) is provided to produce a pipe socket (41) by Path in which the speed of The press-out molding machine is modified in such a way that the mass flow of the melted Is plastic material For the manufacture of external pipes (37) was reduced during pipe socket manufacturing (41) and / or mass flow for internal pipe production (39) was increased. Continuous production of double wall pipes Which has a pipe socket (41) which consists of a smooth inner tube and an outer tube which are then welded together. And is provided with transverse grooves, forming machines Press out two machines This pushes out the external pipe (37) and the inner tube (39) through the cross-joint header (8). A switch (50, 51, 56, 57) is provided to produce a pipe socket (41) by Path in which the speed of The press-out molding machine is modified in such a way that the mass flow of the melted Is plastic material For the manufacture of external pipes (37) was reduced during pipe socket manufacturing (41) and / or mass flow for internal pipe production (39) was increased.

Claims (4)

1. Continuous production method for producing twin-walled pipe (10) with a pipe socket (41) and consisting of a smooth inner tube (39 \ ') and an external (37 \') pipe welded to the pipe. Internal (39 \ ') and transverse groove (38), which consists of the following method steps. First mass flow extrusion in the molten plastic material per unit time. And forming pipes outside (37) having inside and outside The arrangement of the external pipe (37) has the corrugation of the transverse groove (38) and the corrugated rail (40) by applying excessive pressure exerted from the inside to the outside. The secondary flow of the mass in the molten plastic material per unit time. And forming the inner tube (39) in the external pipe (37) the internal pipe (39) is pressed into the corrugated rail (40) of the external pipe (37) to weld the inner tube (39) next to the external pipe (37) ) External expansion of pipes (37) at specified intervals and by overpressure at This is done from the inside to the outside to form an approximately cylindrical pipe sockets with walls. Absolutely smooth (41) and transition between the corrugated rail (40) and the socket (41). Internal tube expansion (39) while expanding the external tube (37) and compressing the part. It is the outside of the inner tube (39) to the socket (41), maintaining the first and second flow of the mass in the molten plastic material. The melting per unit time is constant, during which the external pipe (37) has the corrugation of the transverse groove (38) and the corrugated rail (40) and the first or second flow of the mass in the plastic material is adjusted that Melt per unit time is independent of the first or the current flowing. The second of the mass in the molten plastic material per unit time during Build the pipe socket (41) and the transition part 2. Method to claim 1, where the current flow at one of the outer tube forming mass (37) is reduced during the construction of the pipe socket (41). 3. Method according to claim 1, whereby the second flow of the inner tube mass (39) is increased during the construction of the pipe socket (41) 4. Method according to claim 1, where the force Excessive pressure exerted from the inside to the outside It is at least partially formed by means of a partial vacuum fed from the outside. 5. Method according to claim 1, where the gas above atmospheric pressure is Blown into the space between the outer tube (37) and the inner tube (39) after the inner tube (39) is extruded into the outer tube (37) and before the inner tube (39) is pressed into the corrugated rail (40). ) Of the external duct (37) 6. Method according to claim 1, where the free space (58) between the outer duct (37) and the inner duct (39) is ventilated. While the outer tube (37) and the inner tube (39) are expanded to form a pipe socket (41) 7. Method according to claim 1, where the inner tube (39), when expanded to be used in The pipe socket (41) is created and is then stimulated from the inside by gas at pressure above atmospheric pressure, and the full surface of the inner tube (39) is genuinely pressed into the external tube (37). Continuous type for the manufacture of twin-walled (10) pipes with pipe sockets (41) and consisting of a smooth (39 \ ') internal pipe and an external (37 \') pipe welded to an internal (39 \ ') pipe. ) And has transverse grooves (38), which contain the steps of the following method Providing a thermal recirculating half-shell (12,12 \ ') to form the mother Print piloted in the direction of conveying. (4) The first extrusion flow of the mass in the molten plastic material per unit time. Into the mold And external tube forming (37) with inside and outside The arrangement of the external pipe (37) has the corrugation of the transverse groove (38) and the corrugated rail (40) by applying excessive pressure exerted from the inside to the outside. The secondary flow of the mass in the molten plastic material per unit time. Into the mold And inner tube forming (39) Pressing the inner pipe (39) to the corrugated pipe (40) of the external pipe (37) to weld the inner pipe (39) attached to the external pipe (37) external pipe expansion ( 37) at the specified intervals and by using excess pressure at This is done from the inside to the outside to form an approximately cylindrical pipe sockets with walls. Truly smooth (41) and transition between corrugated rail (40) and pipe socket (41) and inner tube expansion (39) while expanding the external tube (37) and compressing the part. It is the outside of the inner tube (39) to the socket (41), maintaining the first and second flow of the mass in the molten plastic material. The melting per unit time is constant, during which the external pipe (37) has the corrugation of the transverse groove (38) and the corrugated rail (40) and the first or second flow of the mass in the plastic material is adjusted that Melt per unit time is independent of the first or the current flowing. The second of the mass in the molten plastic material per unit time during Build pipe sockets (41) and transition section 9. Method for claim 8 whereby the first flow of the outer tube mass (37) is reduced during construction of the pipe socket (41). 1 0. Claim method 8 whereby the second flow of the inner tube mass (39) is increased during the construction of the pipe socket (41) 1. 1. Approach to claim 8, whereby the excessive pressure acting from the inside to the side The outside is at least partially formed by using some of the vacuum fed from the outside 1. 2. Method according to claim 8, whereby gases at above atmospheric pressure are Blown into the space between the external tube (37) and the inner tube (39) after the inner tube (39) is extruded into the external tube (37) and before the inner tube (39) is pressed into the corrugated rail ( 40) of the external tube (37) 1 3. Method according to claim 8, where the free space (58) between the outer duct (37) and the inner duct (39) is ventilated. While the outer tube (37) and the inner tube (39) are expanded to form a pipe socket (41) 1. 4. Method according to claim 8, where the inner tube (39), when expanded for use in the construction of the pipe socket (41), is then stimulated from the inside by gas at pressure above atmospheric pressure and the full surface of The inner tube (39) is literally pressed into the outer tube (37).