| 摘要 |
PROBLEM TO BE SOLVED: To provide an arctic insole that is used as an insole for a Wellington boot, long boot, rubber boot, etc., in an outdoor cold district accompanied by snowfall and icing, that maintains instant warmth and heat insulation when used, and is free from weakening, as it is called, by recovering through repeated use.SOLUTION: Polyethylene resin is stipulated as a material that maintains flexibility even at low temperatures, that excels in foam molding and post-workability, and is capable of maintaining repetitive compression restoration and water repellency as well as flexibility at low temperatures. A foamable gas is added to the polyethylene resin to prepare a tubular foam net having an expansion ratio of 20-60 times using a rotary die. After the foamable gas component is substituted, the tubular foam net is laminated to be 5-15 mm, with the outer periphery crimped, heat-sealed and cut in accordance with the sole shape. |
