| 摘要 |
<p>PURPOSE:To make arctic boots light in weight by employing a polyurethane sponge which has been hard to use. CONSTITUTION:A polyurethane sheet 1, having expandable cloth 2, 3 such as jersey or tricot bonded on both sides thereof is formed into a socks shape, which is then fitted around a mold 5. An unvulcanized rubber sheet 6 is heated and vulcanized after being bonded to both the instep and leg body portions of the mold and a sole is bonded to the sheet.</p> |
