| 摘要 |
A visible file pocket (100) having a laminar central web (101) and front and back, lower and upper pocket tips (102-105) for receiving the lower and upper edges of documents to be supported thereon and wherein the upper edge (108) of the file pocket (100) is provided with a transversely extending hinge pin receiving bore (109) adapted to receive a hinge pin (110) and laterally projecting hinge elements (112). Methods and apparatus (140) for forming such file pockets (100) from two continuous sheets (114U, 114L) of coated polymeric materials are provided having a laminating station (150), a cooling station (170), a series of edge forming stations (180, 200, 220, 230), and a web subdividing station (270) wherein: (i) the two continuous sheets of coated polymeric materials (114U, 114L) are passed through the laminating station (150) and cooling station (170) with their heat-bondable surfaces in face-to-face relation and are bonded together to form a continuous central laminated web ( 101) having left and right unlaminated, unbonded, longitudinally extending edges (101A, 101B); (ii) the unlaminated plies defining the left and right edges (101A, 101B) are spread apart, heated, and folded in opposite directions to form left and right T-shaped edges (181L, 181R) in a first edge forming station (180; (iii) left and right coated polymeric ribbons (201L, 201R) are bonded to the left and right T-shaped edges (181L, 181R) while forming left and right longitudinally extending gaps (204L, 204R) between the ribbons and T-shaped edges in a second edge forming station (200); (iv) the bonded left and right ribbons (201L, 201R) and T-shaped edges (181L, 181R) are folded over in the third edge forming station (220) by means of left and right grooved rollers (221, 222); (v) the folded over left and right edges are heated by means of C-shaped heaters (231, 260) while air is expressed from the left gap (204L) so as to eliminate such gap; (vi) the left and right folded over edges are passed through left and right profile control assemblies (234, 265) where they are shaped, cooled and set; and (vii), the thus formed continuous web (101) is passed through a web subdividing station (270) wherein it is cut into discrete lengths forming file pockets (100). Various modified file pocket configurations (300, 310, 310', 330, 340, 381, 400) are disclosed.
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