| Patents for B31B 23 - Machinery characterised by making rectangular envelopes or bags of flat form, i.e. without structural provision at the base for thickness of contents, from webs, e.g. from flattened tubular webs (1,472) |
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| 05/08/1991 | EP0425895A1 Device for transverse cutting and sealing of webs |
| 05/08/1991 | CA2029307A1 Device for the transverse cutting and transverse welding of webs |
| 05/02/1991 | DE3936193A1 Making inflated bags used as packing material - involves inflating bags and then sealing them by welding |
| 04/23/1991 | US5009632 Method and device for joining foil hoses |
| 04/16/1991 | US5007744 Strips of interconnected pre-opened reclosable bags |
| 04/16/1991 | CA1282987C Method and apparatus for the manufacture of plastic bags in pairs with side seams |
| 04/10/1991 | CN2074708U Feeding system for bag producing machine |
| 04/09/1991 | US5005337 Envelope mailer |
| 03/21/1991 | DE3929374A1 Increased output of pocket-like articles based on thermoplastic film - two independent parallel film lines are passed to a welding station where a separating, non-stick film keeps them apart during welding |
| 02/19/1991 | US4994128 Method for manufacturing film rolls |
| 02/07/1991 | WO1991001216A1 Dual-envelope making machine and method of using |
| 02/05/1991 | CA1279785C Process for making t-shirt bags |
| 01/29/1991 | US4988332 Method for producing packing bags which can be stacked on a wicket |
| 01/22/1991 | US4986806 Gusset tubing former |
| 12/18/1990 | US4978232 Flexible pouch with folded spout |
| 12/11/1990 | US4976673 Apparatus and method for the production of flexible bags |
| 11/22/1990 | EP0398754A2 Plastic bags and method for their production |
| 11/22/1990 | DE3911251C1 Block of carrier bags consisting of a plurality of stacked carrier bags made of plastic film, and method for their manufacture |
| 11/14/1990 | EP0397099A1 Method and apparatus for manufacturing sacks |
| 11/07/1990 | EP0247073B1 Plastic bag and method and apparatus of manufacture |
| 10/10/1990 | EP0256375B1 Method and apparatus for the production of a stack of bags |
| 09/25/1990 | US4959114 Process for producing flattened gusseted tubing from flat plastic film |
| 09/25/1990 | US4959044 Film tension compensation device for bag making machine |
| 09/18/1990 | US4957571 Method for applying reclosable fastener to package |
| 08/29/1990 | EP0384221A1 Device for applying reinforcement patches provided with glue to a web provided with transverse perforations |
| 08/21/1990 | US4950217 Bag making machine with coupling-controlled perforating and welding |
| 08/07/1990 | US4946431 Apparatus for the manufacture of block-sealed side-gussetted bags |
| 07/24/1990 | US4943167 Plastic bag and method and apparatus of manufacture |
| 07/18/1990 | EP0216800B1 Apparatus for producing flexible containers |
| 07/11/1990 | EP0377416A1 Plant for the continuous manufacture of bags using polypropylene, polythene, PVC and similar plastics |
| 06/27/1990 | EP0375196A2 Method and apparatus for the sequential handling of flexible products |
| 06/19/1990 | US4934993 Bag making apparatus with automatic compensation system |
| 06/05/1990 | US4931034 Bags made from thermoplastic synthetic resin sheeting having cutoff weld seams and process for producing the bags |
| 06/05/1990 | US4931033 Plastic bag construction |
| 05/29/1990 | CA1269557A1 Bottom seal bag making machine |
| 05/15/1990 | US4925438 Bags made of a thermoplastic synthetic resin sheeting and process for the production of said bags |
| 05/08/1990 | US4923436 Plastic bag and method and apparatus of manufacture |
| 05/03/1990 | DE3835721A1 Method for the production of resealable packaging bags (pouches), and packaging bags (pouches) produced accordingly |
| 05/02/1990 | CN2056632U One step forming machine for forced composite bag |
| 04/26/1990 | DE3835135A1 Single or multiple format carrier bag dispenser |
| 04/10/1990 | CA1267553A1 Bottom seal bag making machine |
| 04/03/1990 | US4913765 Apparatus for making bags or sacks from a preferably gusseted continuous tubular film of thermoplastic plastic |
| 03/27/1990 | US4911561 Shopping bags of thermoplastic synthetic resin sheeting with lateral weld seams, and process for the production thereof |
| 03/20/1990 | CA1266793A1 Bottom seal bag making machine |
| 03/06/1990 | US4906228 Method and apparatus for the manufacture of plastic bags in pairs with side seams |
| 03/01/1990 | DE3546743C2 Thermoplastics film bags mfr. machine |
| 02/27/1990 | USRE33173 Envelope with pouch and method of manufacture thereof |
| 02/27/1990 | US4903839 Stack of bags each having congruent cutouts and perforated lines |
| 02/22/1990 | WO1989011390A3 Heat sealing device |
| 02/20/1990 | US4902374 Bag making machine |
| 01/16/1990 | CA1264421A1 Apparatus for making bags |
| 01/10/1990 | EP0350418A1 Former for a tube with side plies |
| 12/27/1989 | EP0347799A1 Envelope forming machine |
| 12/26/1989 | US4889523 Tearable package of synthetic thermoplastic foil and device and method for producing the same |
| 12/20/1989 | CN1038053A High-speed plastic film bag making machine |
| 12/19/1989 | US4887913 Bag for infusion solutions and the like and method of manufacturing the same |
| 11/30/1989 | WO1989011390A2 Heat sealing device |
| 11/28/1989 | US4883450 Process for making single side free plastic bag |
| 10/18/1989 | EP0337341A1 Process and apparatus for cutting and sealing multiple plies of thermoplastic material having thickened sections |
| 10/05/1989 | DE3249893C2 Process and device for producing bags or similar packages from thermoplastic film |
| 10/03/1989 | US4871347 Apparatus for forming a flexible tubing from a single-ply or multi-ply web |
| 10/03/1989 | US4871346 Apparatus for manufacturing bags made of plastic material |
| 09/27/1989 | EP0333726A1 Bag-making machine. |
| 09/26/1989 | CA1261663A1 Method and apparatus for producing bags |
| 09/19/1989 | US4867735 Method and apparatus for continuous production of bags from thermoplastic film |
| 09/06/1989 | CN1035258A Method and apparatus for manufacturing plastic bag |
| 08/23/1989 | EP0329495A1 Installation for manufacturing and stacking thermoplastic bags, etc. |
| 08/23/1989 | EP0328672A1 Roll film and method of manufacturing same |
| 08/08/1989 | US4854451 Apparatus for the manufacture of block-sealed side-gussetted bags |
| 07/13/1989 | DE3744261A1 Process for producing a packaging tube and apparatus for carrying out the process |
| 07/12/1989 | EP0323808A1 A method and equipment for the production and packaging operation of a continuous manufacture of small bags with longitudinal folds and transversal pre-incisions and manufacture thus packaged |
| 07/11/1989 | US4846779 Trapezoidally shaped paper bag and method and apparatus for manufacturing same |
| 07/11/1989 | US4846776 Machine for the manufacture and stacking of bags, pouches and the like made from a thermoplastic material |
| 07/11/1989 | US4846349 Method and equipment for the production and packaging operation of a continuous manufacture of small bags with longitudinal folds and transversal pre-incisions and manufacture thus packaged |
| 07/06/1989 | DE3743510A1 Method and device for producing flat or side-fold bags |
| 06/13/1989 | US4838977 Process and apparatus for making plastic carrying bags or sacks |
| 05/31/1989 | EP0318061A2 Device for the manufacture of bags or sacks from thermoplastique webs provided preferably with side folds |
| 04/04/1989 | US4818328 Process for manufacturing sacks, bags, and the like |
| 03/14/1989 | US4812192 Process and apparatus for cutting and sealing multiple plies of thermoplastic material having thickened sections |
| 03/14/1989 | CA1251179A1 Thermoplastic bag, method and system for its manufacture |
| 03/07/1989 | US4811418 Method for the manufacture of plastic bags with welded side seams |
| 02/22/1989 | EP0303732A2 Method for making a web of interconnected bags |
| 02/22/1989 | EP0303726A1 Method for making a half tube web |
| 02/21/1989 | CA1250172A1 Method for preparing flat-bottom thermoplastic sack |
| 02/16/1989 | DE3826510A1 Carrier bag made of thermoplastic film with side welds, and method for its manufacture |
| 02/09/1989 | WO1989000967A1 Roll film and method of manufacturing same |
| 02/08/1989 | EP0302191A1 Collapsible bag and method of making the same |
| 02/01/1989 | EP0301365A2 Apparatus for manufacturing bags made of plastic material |
| 01/31/1989 | CA1249471A1 Methods for preparing flat-bottom thermoplastic sack and systems therefore |
| 01/17/1989 | US4798573 Machine for the manufacture and stacking of bags, pouches and the like made from a thermoplastic material |
| 01/17/1989 | US4798572 Collapsible bag and method |
| 01/05/1989 | DE3721335A1 Process for producing carrier bags with longitudinally extending thickening and side gussets |
| 01/05/1989 | DE3721303A1 Process for producing carrier bags with a welded base seam |
| 01/03/1989 | CA1247910A1 Former for form, fill and seal packaging machines |
| 12/14/1988 | EP0294582A2 Device for producing thermoplastic bags or sacks from a tubular sheath supplied preferably with sidefolds |
| 12/06/1988 | US4790029 Collapsible bag with square ends formed by triangular portions |
| 12/06/1988 | US4789350 Method and apparatus for manufacturing mailing envelopes or bags |
| 12/06/1988 | CA1245961A1 Thermoplastic bag machine |
| 11/22/1988 | CA1245090A1 Method for preparing flat-bottom thermoplastic sack and systems therefor |
| 11/02/1988 | EP0247073A4 Plastic bag and method and apparatus of manufacture. |