Method and apparatus for forming spirally wound rectangular cross-section tubes of thermoplastic cardboard strips
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United States of America Patent
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Aug 22, 2000
Grant Date -
N/A
app pub date -
Apr 8, 1998
filing date -
Oct 11, 1995
priority date (Note) -
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status (Latency Note)
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Abstract
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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