Universal file with inner gluing back for thermal gluing systems of the type comprising substantially the combination of a front sheet, a rear sheet, a back and a layer of binding glue applied on the inner side of said back, characterized in that the said back is made of a flexible synthetic material so that such file may be used for binding bundles of documents having various thicknesses.

A disposable self-pleating drape comprises an elongated sheet of expendable material. A pleating strip extends along an upper marginal portion of the sheet and is connected in face-to-face relation to the sheet at a longitudinally series of pleating locations. At least two prong receiving openings are formed between the pleating strip and the sheet at each pleating location and are spaced apart a distance substantially greater than the distance between corresponding parallel prongs on an associated drapery hook used to hang the drape. A continuous form assembly of series connected disposable self-pleating drapes is made by continuously advancing an elongated web of disposable material, folding a longitudinally extending marginal portion of the advancing web in overlying relation with another portion of the web, and connecting the marginal portion in face-to-face relation with the other portion of the web at a longitudinal series of pleating locations to form at least two prong receiving pockets at each pleating location.

A zippered shower curtain (10) comprising a valance (12), a curtain (14), and a zipper (16). The valance (12) includes a plurality of spaced apart apertures (22) allowing for suspension of the valance (12) from a horizontally disposed rod (28) by rings (24) or hooks (26). The curtain (14) is removably attached to the valance (12) by the zipper (16) allowing for the easy attachment or detachment of the curtain (14) from the valance (12) by the engagement or disengagement of the zipper teeth (32).

A membrane type liquid containment system such as a membrane roof, pond liner and the like is disclosed wherein a large membrane is formed by adhering together individual membrane sheets at lap seams or field splices. The field splice includes a primary adhering seal formed by a splicing cement. The splice also includes a thick bead of a sealant applied between the overlapped edges. This seal acts to form a secondary or redundant seal in the field splice whereby any failure in the splicing cement or primary bond does not cause failure. A method of forming this seal is also described which permits application of the lap sealant after the cement has been applied while the cement is developing body or strength.

A method is disclosed for producing a perforated multiweb folded display product or insert having a width greater than the width of any single web forming a part thereof. The perforated multiweb product is also claimed. Gutterless joints are used to allow the display to lay flat when opened. Perforations allow the insert to be removably bound within a book or magazine. In some embodiments, displays having widths exceeding commercially available web widths are disclosed. In other embodiments, two or more webs are combined to yield web printed single or double magazine inserts or displays having an active viewing width in excess of 70 inches.