Method of incorporating a tear string in a thermoplastic web

1,120,701. Making bags with tear strings; seaming non-metallic sheet material. DOW CHEMICAL CO. 18 Oot., 1965 [26 Oct., 1964], No. 44079/65. Headings B5D and B5K. [Also in Division B8] A tear string is secured to the heat-sealable thermoplastic surface of a web 11, (Fig. 1), by heating a narrow stri...

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Hauptverfasser:	VILUTIS LEONARD J, HULLER ADOLF H
Format:	Patent
Sprache:	eng
Schlagworte:	ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS,e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES,DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS CONVEYING HANDLING THIN OR FILAMENTARY MATERIAL MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGINGARTICLES OR MATERIALS MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNERANALOGOUS TO PAPER MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN AMANNER ANALOGOUS TO PAPER PACKAGES PACKAGING ELEMENTS PACKING PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS STORING TRANSPORTING UNPACKING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUSTO PAPER
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Zusammenfassung:	1,120,701. Making bags with tear strings; seaming non-metallic sheet material. DOW CHEMICAL CO. 18 Oot., 1965 [26 Oct., 1964], No. 44079/65. Headings B5D and B5K. [Also in Division B8] A tear string is secured to the heat-sealable thermoplastic surface of a web 11, (Fig. 1), by heating a narrow strip of the web and pressing the strip in place and the web is then welded to itself or to a further web to form a flat bag before the resin at the tear string has hardened. The pressure may be applied by a heated head 22, (Fig. 1), pressed by a pneumatic ram 28 against a portion of the material supported on an anvil 12. The tear string, which may be a single filament or a yarn of cotton, rayon or nylon is fed from a bobbin 19 through a guide 21 which can be adjusted along guides 16. The bag may be formed by superposing a second sheet on the sheet with the tear string, or by folding the sheet in two, and heat-sealing along the open edges. A notch (38), (Figs. 3 and 4, not shown) near the tear string may be cut by machine.