Apparatus for producing double-walled composite tubes

Details Apparatus for producing double-walled composite tubes Apparatus for producing double-walled composite tubes

B - Operations, Transporting

29

C

B29C 47/20 (2006.01) B29C 47/92 (2006.01)

Patent

CA 2513840

The invention describes an apparatus for producing double-walled composite tubes which have an outer wall with wave peaks and wave valleys and a smooth inner wall. The apparatus (10) has two rows of shaping-jaw halves (12, 14) which, along a common shaping section, form a shaping tunnel (16) for producing the composite tube. At least one pair of the shaping-jaw halves (14) located opposite one another in the shaping section (16) has an inner contour (22) which forms a tube socket portion (50). The remaining shaping-jaw halves (12) are alternately designed with transverse grooves (18) and transverse fins (20). A sizing mandrel (24), with narrow vacuum grooves (26) formed spaced apart from one another in the axial direction on its outer lateral surface (28), projects into the shaping tunnel (16) for the smooth inner wall of the composite tube. A vacuum control valve device (30) is provided for the purpose of realizing defined closure and reopening of the vacuum grooves (26) which are in each case located in the tube socket portion (50) in steps with the aid of a drive device (38) and of flow-connecting them to a vacuum source (32).

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