Patent EP-1737648-A2 (EP)
Inventor: PULLER STEFAN
IPC: B29C65/74
Filed: 2005-10-14
Abstract: A combined system for making plastic bags from film comprises (i) film dispensers, (ii) port dispensers, (iii) a combined welding/cutting tool for attaching ports, welding the film together and cutting the film, (iv) another welding tool for the ports and (v) a transfer station to further processing. A system (350) for the production of plastic bags (330) from plastic film (120, 130), comprising (i) one or more film dispensers (340), (ii) one or more port dispensers for making plastic elements (250), (iii) a combined welding/cutting tool (90) for (a) attaching the elements (250) to the bags (330) to form ports, (b) welding the film (120, 130) together on a welding form (40) and (c) cutting the film (120, 130), (iv) another welding tool for welding the ports and (v) a transfer station (290) for taking over the bags (330) for further processing. Independent claims are also included for (1) a welding tool (10) for the production of bags (330), comprising a stationary, essentially flat, lower plate (20) and a moveable, shaped upper plate (30) (2) a cutting tool (50) for the production of bags (330), comprising a stationary, flat lower plate (60) and a moveable, shaped upper plate (70) (3) a combined welding/cutting tool (90) comprising a stationary flat lower plate (100) and a moveable, shaped lower plate (110) (4) a welding tool (10) for joining two layers of plastic film (120, 130), comprising a lower plate at a first temperature (T1) below the softening point (SP) of the film material(s) (I) and an upper plate at a second temperature (T2) above the melting point (MP) of (I) (5) a combined welding/cutting tool with lower and upper plates at temperatures T1 and T2 as above (6) a device (350) for making plastic bags (330) with a cutting tool (10) for separating layers of film (120, 130), comprising a grip system (155) which can be moved past the closed tool to pull layer(s) of film into the open tool (7) a similar device (350) with a welding tool (50) and a similar grip system (155) (8) a similar device (350) with a combined welding/cutting tool (90) and a similar grip system (155) (9) a device for making plastic bags (330), with beds (180) for holding the cut-and-welded bags until reaching a transfer station (290) (10) a device (350) for making bags (330) in which plastic elements (250) are placed in beds (180) and fed into a combined welding/cutting tool (90) while still in the beds (180), after which the bags (330) on the elements (250) are discharged from the tool with the beds (180) (11) a filling station for filling plastic bags with at least two ports, comprising a metering valve (190) which distributes a liquid (200) to the ports through feeder tubes (220) (12) a method (M1) for the production of bags (330) by using the system described above, especially with the welding and/or cutting tools and associated systems as described (13) a method (M2) for the production of bags (330), in which a grip system (155) with a first grip (160) and/or a second grip (170) moves past a closed combined welding/cutting tool (90), grips one or more layers of plastic film (120, 130) and then pulls them into the opened tool.