Double-walled tube and a method of producing thereof

B - Operations – Transporting – 65 – D

Patent

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190/38, 222/92

B65D 35/14 (2006.01) B65D 35/02 (2006.01)

Patent

CA 1039209

ABSTRACT OF THE DISCLOSURE The disclosure describes a method for producing a double- walled tube by inserting a core into a double-walled tube body having a shoulder and a mouth section. The tube body consists of a thermoplastic inner tube member which has a trumpet-shaped top section, and a thin-walled outer tube member made of metal. The core has an outer configuration corresponding to the inner configuration of the tube body. The exterior of the core is closed with plugs having an inner configuration corresponding to the outer configuration of a lid section to be formed on at least the top portion of the tube body, thereby defining a cavi- ty to mold the lid section in which the trumpet-shaped top sec- tion of the inner tube member is protruded into the cavity. Finally, a molten thermoplastic resin is injected into the cavity whereby the lid section is formed on at least the top portion of the tube and is integrally rigidly connected to the trumpet- shaped top section of the inner tube member of the tube. The disclosure also describes a double-walled tube made by this method.

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