EP 0002326 A1 19790613 - Valve sack and method of making it.
Title (en)
Valve sack and method of making it.
Title (de)
Ventilbeutel und dessen Herstellungsverfahren.
Title (fr)
Sac à valve et son procédé de fabrication.
Publication
Application
Priority
- GB 1153578 A 19780323
- GB 4881477 A 19771123
Abstract (en)
A valve sack is made from tubular material whose opposed longitudinal edges have been gusseted. There is formed in one of the gussets an aperture (S) which extends along the gusset for a distance appreciably less than the width (D) of eventual sack. The outer longitudinal edges of the gusset are then sealed together, either directly or via a further sheet of material, over a distance greater than the length of said aperture, to form a tube running along one longitudinal edge of the material. The material is then sealed together along two lines which run across the material and are spaced apart to define the width of the eventual sack. One end of the tube is sealed off. A further aperture overlapping the first mentioned aperture if formed in the tube.
IPC 1-7
IPC 8 full level
B31B 1/84 (2006.01); B31B 29/84 (2006.01); B65D 30/24 (2006.01)
CPC (source: EP US)
B65D 31/14 (2013.01 - EP US); B31B 70/844 (2017.07 - EP); B31B 2150/00 (2017.07 - EP US); B31B 2160/20 (2017.07 - EP US)
Citation (search report)
GB 1035248 A 19660706 - VEITH KUNSTSTOFFWERK G M B H
Designated contracting state (EPC)
BE CH DE FR LU NL SE
DOCDB simple family (publication)
EP 0002326 A1 19790613; DK 519278 A 19790524; FI 783551 A 19790524; IE 47675 B1 19840516; IE 782302 L 19790523; JP S54100880 A 19790808
DOCDB simple family (application)
EP 78300626 A 19781114; DK 519278 A 19781121; FI 783551 A 19781121; IE 230278 A 19781122; JP 14491678 A 19781122