EP 1572442 A4 20081105 - METHOD AND APPARATUS FOR PRODUCING VALVE BAGS
Title (en)
METHOD AND APPARATUS FOR PRODUCING VALVE BAGS
Title (de)
VERFAHREN UND VORRICHTUNG ZUR HERSTELLUNG VON VENTILBEUTELN
Title (fr)
PROCEDE ET DISPOSITIF DE FABRICATION DE SACS A VALVE
Publication
Application
Priority
- US 0334882 W 20031031
- US 42299502 P 20021101
Abstract (en)
[origin: WO2004041660A2] The present invention relates to a method and apparatus for folding and sealing a web of material to form an item with a contoured seal such as a valve bag. Folding apparatus form the web of film into a continuous tubular web having upper and lower sections, a closed side and an open side. The open side has two folded flaps that extend into an inside area of the tubular web. A longitudinal sealer includes a floating sealer located inside the tubular web. The floating sealer and its contoured heating element are selectively and intermittently pressed against the overlapping flaps to form a contoured seal that bonds the flaps together. The contoured seal defines a self-sealing valve port through which product is poured to fill the bag. Pairs of repelling magnets biasingly elevate the floating sealer above the overlapping flaps when the longitudinal sealer is in its release position. The sealer "floats" inside the continuous tubular web so that the web can be intermittently drawn past the floating sealer with a minimal amount of drag.
IPC 8 full level
B29C 65/00 (2006.01); B29C 65/22 (2006.01); B31B 19/36 (2006.01); B31B 19/64 (2006.01); B31B 19/84 (2006.01); B31B 70/00 (2017.01); B65B 1/18 (2006.01); B65D 30/24 (2006.01)
CPC (source: EP)
B29C 65/222 (2013.01); B29C 65/223 (2013.01); B29C 65/228 (2013.01); B29C 66/0044 (2013.01); B29C 66/1122 (2013.01); B29C 66/244 (2013.01); B29C 66/431 (2013.01); B29C 66/4312 (2013.01); B29C 66/80 (2013.01); B29C 66/8122 (2013.01); B29C 66/8244 (2013.01); B29C 66/8511 (2013.01); B29C 66/91231 (2013.01); B29C 66/91313 (2013.01); B29C 66/91315 (2013.01); B29C 66/91421 (2013.01); B29C 66/91431 (2013.01); B65D 31/145 (2013.01); B29C 66/81821 (2013.01); B29C 66/81871 (2013.01); B29C 66/961 (2013.01); B29L 2031/7128 (2013.01); B29L 2031/7506 (2013.01); B31B 70/266 (2017.07); B31B 70/36 (2017.07); B31B 70/642 (2017.07); B31B 70/644 (2017.07); B31B 70/855 (2017.07)
Citation (search report)
- [A] FR 2345293 A1 19771021 - ICI LTD [GB]
- [A] US 3812769 A 19740528 - BARNES J, et al
- See references of WO 2004041660A2
Designated contracting state (EPC)
DE ES IT
DOCDB simple family (publication)
WO 2004041660 A2 20040521; WO 2004041660 A3 20041223; WO 2004041660 A8 20050203; AU 2003286858 A1 20040607; AU 2003286858 A8 20040607; EP 1572442 A2 20050914; EP 1572442 A4 20081105
DOCDB simple family (application)
US 0334882 W 20031031; AU 2003286858 A 20031031; EP 03778074 A 20031031