Continuous linear substrate infusion
A method of forming an active agent infused linear material includes passing a substantially linear polymeric substrate through a linear substrate infusion chamber in a first direction, flowing a liquid infusion solution through the linear substrate infusion chamber in a second direction, and contacting the linear substrate with the liquid infusion solution at an infusion temperature and for an infusion time effective to infuse the one or more active molecules into or onto a surface of the linear substrate, thereby forming an active agent infused linear material. The liquid infusion solution includes one or more active molecules. The second direction is substantially opposite or substantially parallel to the first direction. A linear substrate infusion system and a polymeric linear substrate are also disclosed.
1. A method of forming an active agent infused linear material comprising:
passing a linear polymeric substrate comprising a polyamide through a linear substrate infusion chamber in a first direction;
flowing a liquid infusion solution comprising one or more active molecules through the linear substrate infusion chamber in a second direction, the second direction being opposite or parallel the first direction; and
contacting the linear substrate with the liquid infusion solution such that the portion of the substrate that contacts the infusion solution is immersed in the infusion solution and at an infusion temperature and for an infusion time effective to infuse the one or more active molecules into or onto a surface of the linear substrate at a depth less than the cross sectional dimension of the linear substrate thereby forming an active agent infused linear material.
2. The method of claim 1 , wherein the infusion temperature is below a glass transition temperature of the polymer.
3. The method of claim 1 , wherein the infusion temperature is from 80° C. to 99.9° C.
4. The method of claim 1 , wherein the infusion time is from 0.1 seconds to 5 seconds.
5. The method of claim 1 , wherein the active molecules penetrate the surface of the linear substrate to a depth of less than 1 millimeter.
6. The method of claim 1 , wherein the one or more active molecules comprise a dye selected from the group consisting of an unstable dye, an acid dye, an anthraquinone dye, an azo dye, a triphenylmethane dye, and a premetalized dye.
7. The method of claim 1 , wherein the liquid infusion solution consists essentially of the one or more active molecules and an infusion agent consisting essentially of water.
8. The method of claim 1 , wherein the liquid infusion solution consists essentially of an acid dye, water, glycol, and an acid.
9. The method of claim 8 , wherein the acid is acetic acid.
10. The method of claim 1 , wherein the liquid infusion solution further comprises water, the water comprising tap water, or deionized water including from about 0.1 g/L to about 0.5 g/L salt added thereto.