METHOD OF APPLYING WINDOWS TO ENVELOPES AND BAGS

A blank for making an envelope with a window opening is fed past a first station where a volatile solvent, such as ethylene trichloride, is applied to the underside of the blank to penetrate and partly or completely saturate the blank around the window opening. Then a strip of a transparent material...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	TAYLOR G,US
Format:	Patent
Sprache:	eng
Schlagworte:	ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR 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 PACKAGES PACKAGING ELEMENTS PACKING PERFORMING OPERATIONS STORING TRANSPORTING
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Beschreibung
Zusammenfassung:	A blank for making an envelope with a window opening is fed past a first station where a volatile solvent, such as ethylene trichloride, is applied to the underside of the blank to penetrate and partly or completely saturate the blank around the window opening. Then a strip of a transparent material, such as polystyrene, which is slightly larger than the window opening is pressed onto the blank over the opening. The portion of the strip overlying the blank around the opening is dissolved momentarily by the solvent and adheres completely around the opening. Alternatively, the solvent can be applied after the strips are placed over the window openings. Alcohol may be added to the solvent to increase the speed and depth of penetration of the solvent.