Method and apparatus for forming spirally wound rectangular cross-section tubes of thermoplastic cardboard strips

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 6106451
SERIAL NO

09051356

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Abstract

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A method of producing a rectangular cross-section cardboard tubing by passing a plurality of cardboard strips having a thermoplastic coating thereon through a heating unit so as to hear the plurality of strips and melt the thermoplastic coating. Thereafter, the plurality of heated strips are passed through a guiding unit so as to align the strips in an overlapped configuration. The aligned plurality of strips are wound around an elongated, rectangular cross-section, rotating core so as to place the plurality of strips in an overlapped, spiral configuration along the core and form a tubing. The tubing is fed along the core, and a cutting unit cuts the tubing into lengths.

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Patent Owner(s)

  • LATTPALLEN SVERIGE AB

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Andreasson, Ingmar Osbergsgatan 4A, S-426 77 Vastra Frolunda, SE 4 136

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