Hermetic, insecticidal food storage bag, use of it and a method for its production

A method for producing a bag (1), the bag comprising an inner side facing an inner volume and an opposite outer side facing the environment, wherein the method comprises providing the bag (1) with a textile layer forming the inner side of the bag, wherein the textile layer comprises a textile that is woven, knitted, or non-woven, and providing the bag (1) with a polymer multilayer film (8, 18) only on the outer side;

• wherein the polymer multilayer film (8) comprises an insecticidal polymer layer (9) in which an insecticide is melt-incorporated for preventing intrusion of insects into the bag (1) by the insecticidal polymer layer (9);
• wherein the method comprises including at least one oxygen barrier polymer layer (10) in the polymer multilayer film (8, 18) for providing an Oxygen Transmission Rate, OTR, through the multilayer film (8) which prevents breeding of insects and/or sterilizes and/or kills insects inside the bag (1) when the bag (1) is in closed condition
• wherein the polymer multilayer film (8) is provided as a lamination process that comprises melting a first and a second polymer in an extruder (17) and co-extruding the two layers (9, 10) as part of a multilayer stream (18′), cooling the multilayer stream (18′) to form a multilayer film (18) and rolling the multilayer film (18) onto rollers (19);
• at a lamination location, rolling the multilayer film (18) from the roller and laminating it onto a sheet of textile (7);
• laminating an additional outer polymer film layer (25) onto the polymer multilayer film (18), which comprises a surface print but no insecticide, or
• as an extrusion-coating process that comprises melting a first and a second polymer in an extruder (17) and co extruding the two layers (9, 10) as part of a multilayer stream (8′);
• and
• laminating an additional outer polymer film layer onto a sheet of textile (7) with the multilayer stream (8′) as a bonding material between an additional outer polymer film layer and the sheet of textile (7), while the multilayer stream (8′) is still in a partially or fully molten state;
• and then solidifying the multilayer stream (8′) into a multilayer film (8) while on the sheet of textile (7) and covered by the additional outer polymer film layer (25).