METHOD FOR PRODUCTION OF A PLASTIC BAG WITH DRAINING VALVE, A PLASTIC BAG AND USE OF A PLASTIC BAG

摘要

A method for production of a plastic bag (1) for liquid is described together with such a plastic bag (1). The method comprises the steps of providing a plastic web (4) which has been manufactured by extrusion in an extrusion direction (3) and to arrange said at least one plastic web (4) in at least two layers. The method also comprises the steps of welding together said at least two layers along said at least one longitudinal welding line (18) which essentially follows the extrusion direction (5), and to weld together said at least two layers along transverse welding lines (7) which extend transverse to the longitudinal welding line (18), and which are arranged at predetermined distances from each other, so that a number of connected plastic bags (1) are formed. The application also includes a plastic bag and use of a plastic bag.