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    • 2. 发明授权
    • Light-tight cassette
    • 不透光盒
    • US5219418A
    • 1993-06-15
    • US963510
    • 1992-10-20
    • Edward BuelensJozef L. Van Engeland
    • Edward BuelensJozef L. Van Engeland
    • G03B17/30G03B27/58
    • G03B27/588G03B17/30G03B2217/265
    • A cassette for light-tightly holding and dispensing a roll of web material, e.g. photographic film, which has a peripheral dispensing slot in its shell for passage of the web therefrom, which slot is formed by generally radially directed re-entrant lips lined with light-sealing strips to seal the slot against penetration by light, the sealing strips being adhered to the mutually facing surfaces of the lips by layers of adhesive on their backsides, preferably a pressure-sensitive adhesive, wherein the innermost edge of each of the adhesive layers is in a radially outwardly retracted position relative to the innermost edge of the associated sealing strip, leaving a short inner marginal portion of the sealing strip free of adhesive and overlying the inner edge of the adhesive layer to conceal and shelter the adhesive edge against possible contact with the exiting web. The non-adhered inner margin, and preferably a short outermost portion of each sealing strip as well, is reinforced to increase its stiffness, as by means of a coating of a polymer.
    • 用于轻轻地保持和分配卷筒纸材料的盒子,例如, 摄影胶片在其外壳中具有用于通过纸幅的外围分配槽,该槽由大致径向指向的带有光密封条带的入口唇形成,以密封槽以防止光穿透,密封条是 通过其背面上的粘合剂层优选粘合剂粘附到唇部的相互面对的表面上,其中每个粘合剂层的最内边缘相对于相关密封件的最内边缘处于径向向外缩回的位置 留下密封条的短内部边缘部分没有粘合剂并且覆盖粘合剂层的内边缘以隐藏和遮蔽粘合剂边缘,以防止可能与出口网接触。 每个密封条的未附着的内边缘,优选短的最外面部分也被加强,以通过聚合物的涂层增加其刚度。