Abstract: The invention relates to an envelope of plastic sheet material consisting of a thermoplastic sheet, which is laminated to a sheet of hydrophilic material at least on the side forming the outside of the envelope. The flap belonging to the envelope is laminated to a paper layer at least on its inside, said layer supporting a gumming. The invention also relates to a method for continuously making such envelopes, a web of a plastic sheet laminated according to the above being folded with its edge portions towards a central area, which is left free. One or more paper webs are laminated to this central area and punched-out areas are made in the central area to a desired shape of the flaps of the envelopes. The envelopes are thereafter sealed along their sides by means of transversal welding seams and separated from each other.

Abstract: A storage device for filamentous material formed by a base sheet and a cover sheet. The base sheet has a vertical row of peaked or arched slots and the cover sheet a corresponding number of horizontal slots. The slots in the base sheet define parallel ribbons and the slots in the cover sheet define horizontal ribbons. The cover sheet is secured to the base sheet by spot-welding. The peaks of the base sheet ribbons are welded to the horizontal ribbons and the sheets are welded at the sides to form thereby a partition defining intermediate pockets for the filamentous material.