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The comprehensive paper tube manufacturer Sankyo Marutou exhibited at the "Paper Processing Technology Exhibition" held at the Osaka Industrial Creation Center on April 18 and 19, promoting their "flame-retardant waterproof paper tubes." In addition to the inherent properties of paper tubes, their fire resistance and high water repellency due to proprietary technology have garnered attention, and various applications are expected. For several years, they have been collaborating with processing equipment manufacturers to develop machinery capable of "cutting grooves vertically into paper tubes," continuing to advocate for "vertically split paper tubes." During the demonstration, they showed that even with cuts made, the paper tube could be submerged in water multiple times while having fabric or acrylic sheets inserted between joint paper tubes. While paper tubes have higher water resistance compared to other paper products like cardboard, this demonstration proved that even with cuts, moisture does not penetrate the interior of the paper tube, making it resistant to peeling and deformation. Many visitors stopped to observe and showed interest. In addition to being used as furniture and fixtures in moisture-prone areas like kitchens, further applications are anticipated, such as plant supports and packaging. Furthermore, in pursuit of a "circular society," they are also developing environmentally friendly products, such as paper bobbins made from biodegradable plastics, to meet various needs.