Methods of making oxygen scavenging articles containing moisture
View Patent ↗An extruded or molded article containing iron based oxygen scavenger, electrolytes, activated carbon, silica gel, or other water absorbing media, and optionally pore formers, is subjected to deformation to create voids or porosity, and subjected to water spraying or dipping to obtain a water activity of 0.4 or higher. The article is placed in a container or package containing oxygen sensitive articles.
1. A method of making an oxygen scavenging material comprising:
providing a film containing an oxygen scavenger;
stretching the film to obtain a stretched film; and
wetting the stretched film with a liquid such that pores disposed in the material retain a portion of the liquid.
2. The method of claim 1 , further comprising drying the stretched film after the wetting step.
3. The method of claim 1 , wherein the film containing the oxygen scavenger comprises an oxygen scavenger, a salt, a moisture absorber, and a polymer.
4. The method of claim 3 , the film comprising a bonding agent and a pore former.
5. The method of claim 3 , wherein the film is extruded from a mixture of the oxygen scavenger, the salt, the moisture absorber, and the polymer.
6. The method of claim 1 , wherein the stretching the material comprises using one of a machine directional orientation tool and a transverse directional orientation tool.
7. The method of claim 1 , further comprising cutting the wetted film.
8. The method of claim 7 , wherein the cutting comprises die cutting.
9. The method of claim 1 , further comprising forming an article from the wetted film.
10. The method of claim 9 , wherein the article is one of a packet, a ribbon, a strand, a ring, a flat film, a sheet, a label, an insert, lid stock, or a sealing layer.
11. The method of claim 1 , further comprising drying the wetted stretched film.
12. The method of claim 1 , further comprising providing at least one additional film layer on the wetted stretched film.
13. The method of claim 1 , wherein the wetting the stretched film comprises wetting the stretched film with a moisturizer.
14. The method of claim 1 , wherein the wetting the stretched film comprises exposing the material to a bath.
15. The method of claim 1 , wherein each of the pores is between about 0.1 micron and 500 micron.