| 摘要 |
<p>A panel file used for storage of mainly rectangular relatively thin plates, particularly micro film plates or so-called microfiche, comprising three foil layers welded the one to the other, namely a foremost cover foil (4) in which a plurality of slits (5) are formed parallel to each other and extending transversally to the foil (4), said slits being provided at the center of the foil (4) with an upwardly open cut (6), an intermediate support foil in which a number of retaining straps (9) are formed having two inclined diverging legs (10) extending downwards, which legs are connected to each other at the stem by a transversal binding element (11) extending crosswise to the foil, and a rearmost second cover foil (4) that corresponds to the first cover foil (4) but having slits (5) that are displaced in the longitudinal direction of the panel (1) at a distance that corresponds to about half the distance (a) between two slits (5). A panel file thus constructed makes it possible by means of three foil layers only aid by using one welding operation in manufacturing to store as many microfiche as the hitherto known panel files comprising 4 foil layers and requiring at least two welding operations and/or three welding operations and an intermediate turning of the subject.</p> |
