EP 0042586 A1 19811230 - A process for cutting and perforating plastic film.
Title (en)
A process for cutting and perforating plastic film.
Title (de)
Verfahren zum Schneiden und Perforieren von Kunststoff-Folie.
Title (fr)
Procédé de découpage et de perforation de film en matière plastique.
Publication
Application
Priority
US 16093980 A 19800619
Abstract (en)
A process is disclosed for cutting or perforating a plastic film sheet material with a knife of improved durability which comprises a metal substrate coated on one side only with a hard material such as tungsten carbide. A preferred embodiment comprises a process for making a continuous strip of interconnected and separable plastic film bags of low pressure - low density polyethylene from a tube of same including the steps of sealing the tube across its width at longitudinally-spaced intervals and perforating the tube at similar intervals, to provide tear-off lines, with a perforating blade provided with a coating on one side only of a hard material such as tungsten carbide. Such a perforating blade has a significantly improved service life, as compared to uncoated similar blades or similar blades coated on both sides, in processes for making bags from low pressure-low density polyethylene.
IPC 1-7
IPC 8 full level
B26D 1/00 (2006.01); B26F 1/18 (2006.01); B31B 1/14 (2006.01); B31B 19/14 (2006.01); B65B 61/06 (2006.01)
CPC (source: EP KR)
B26F 1/18 (2013.01 - EP); B65D 29/00 (2013.01 - KR); B65D 31/16 (2013.01 - KR); B31B 70/14 (2017.07 - EP)
Citation (search report)
- DE 2107043 B2 19730201
- US 4019947 A 19770426 - STOCK DAVID K, et al
- US 4064776 A 19771227 - WALITALO CHARLES R, et al
- DE 2533471 A1 19770210 - GREINER GMBH & CO
- US 3975891 A 19760824 - GUNTHER ROLAND ERIC
Designated contracting state (EPC)
BE DE FR GB IT NL SE
DOCDB simple family (publication)
EP 0042586 A1 19811230; AU 7122881 A 19811224; BR 8103774 A 19820309; CA 1177383 A 19841106; FI 811863 L 19811220; JP S5727742 A 19820215; KR 830006085 A 19830917; NO 812033 L 19811221; ZA 813869 B 19820630
DOCDB simple family (application)
EP 81104658 A 19810616; AU 7122881 A 19810601; BR 8103774 A 19810615; CA 378630 A 19810529; FI 811863 A 19810615; JP 9310981 A 19810618; KR 810002236 A 19810619; NO 812033 A 19810616; ZA 813869 A 19810609