Apparatus for producing double-walled composite tubes

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

2006-06-23

2008-11-18

Durand, Paul R (Department: 3721)

Manufacturing container or tube from paper; or other manufacturi

Tube making

With extruding, drawing, or attenuating

C493S269000, C264S511000, C425S325000

Reexamination Certificate

active

07452319

ABSTRACT:
An apparatus for producing double-walled composite tubes, which have an outer wall with wave peaks and wave valleys and a smooth inner wall, includes two of rows first and second shaping-jaw halves which, along a common shaping section, form a shaping tunnel. The first shaping-jaw halves are located opposite each other in the shaping section and have an inner contour forming a tube socket portion. The second shaping-jaw halves, also located opposite each other, include transverse grooves alternating with transverse fins. A sizing mandrel, which defines narrow vacuum grooves spaced apart from one another in the axial direction on its outer lateral surface, projects into the shaping tunnel and forms the smooth inner wall of the composite tube. A vacuum control valve device provides for defined closure and reopening of the vacuum grooves when positioned in correspondence with the tube socket portion.

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