| 摘要 |
<p>PURPOSE:To hold the intervals between films to a proper degree, by spirally involving a film having a large number of spacer protruded parts and fixing the same by the spacer protruded parts, the repulsive force of the film as a whole and a fixing apparatus. CONSTITUTION:A met film 1 is formed as an elastic perforated film made of a synthetic resin to which a large number of spacer protruded parts 2 and holes 1a, 2a are formed. This net film 1 is involved small and fixed by a fixing apparatus 3. When the fixing apparatus 3 is detached, the net film 1 expands repulsively and spirally to become large and the intervals between films are properly held by the fixing apparatus used when the film become large to form the laminated block of the net film 1. A foldable net box 6 is obtained by forming net plates 4 into a box shape having a square fross-sectional area by joint hinges 5.</p> |
