US 12,377,643 B2
Hermetic, insecticidal food storage bag, use of it and a method for its production
Mikkel Vestergaard Frandsen, Tiburon, CA (US); Thomas Weis, Les Monts-de-Corsier (CH); and Allan Mortensen, Lausanne (CH)
Assigned to VESTERGAARD SÀRL, Lausanne (CH)
Filed by VESTERGAARD SÀRL, Lausanne (CH)
Filed on Jul. 8, 2024, as Appl. No. 18/765,964.
Application 18/765,964 is a division of application No. 16/765,891, abandoned, previously published as PCT/EP2017/079877, filed on Nov. 21, 2017.
Prior Publication US 2024/0359441 A1, Oct. 31, 2024
Int. Cl. B65D 30/08 (2006.01); A01N 25/10 (2006.01); B31B 70/10 (2017.01); B31B 70/16 (2017.01); B31B 70/60 (2017.01); B31B 70/74 (2017.01); B31B 150/00 (2017.01); B31B 155/00 (2017.01); B31B 160/10 (2017.01); B32B 5/02 (2006.01); B32B 27/08 (2006.01); B32B 27/12 (2006.01); B32B 27/30 (2006.01); B32B 27/32 (2006.01); B32B 37/15 (2006.01); B65D 65/42 (2006.01); B65D 81/28 (2006.01)
CPC B32B 27/08 (2013.01) [A01N 25/10 (2013.01); B31B 70/10 (2017.08); B31B 70/16 (2017.08); B31B 70/79 (2017.08); B32B 5/024 (2013.01); B32B 27/12 (2013.01); B32B 27/306 (2013.01); B32B 27/32 (2013.01); B32B 37/15 (2013.01); B65D 29/02 (2013.01); B65D 65/42 (2013.01); B65D 81/28 (2013.01); B31B 70/61 (2017.08); B31B 70/76 (2017.08); B31B 2150/003 (2017.08); B31B 2155/003 (2017.08); B31B 2160/10 (2017.08); B32B 2307/7244 (2013.01); B32B 2307/764 (2013.01); B32B 2323/04 (2013.01); B32B 2329/04 (2013.01); B32B 2439/46 (2013.01)] 8 Claims
OG exemplary drawing
 
1. 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).