Thin film strips
View Patent ↗A method of forming a thin film strip and thin film strips formed thereby where the method comprises coating a liner substrate with a wet slurry of film forming ingredients and other components and drying the wet slurry in a drying apparatus to form a film, measuring the moisture content of the film either during of upon exit from the drying apparatus, and storing the film in a minimal moisture loss environment during a curing process.
1. A method of forming a thin film strip composed of a mixture of film forming ingredients and other components comprising the steps of:
coating a liner substrate with a wet slurry of the mixture of film forming ingredients and other components;
drying the wet slurry in a drying oven to form a film;
measuring a moisture content of the film as the film exists in the drying oven; and
storing the film in a minimal moisture loss environment during a curing process.
2. The method of claim 1 further comprising the steps of: converting the film into thin strips; and packaging the thin strips into compact dispensers.
3. The method of claim 1 wherein the step of converting further comprises the steps of: slitting the film into a series of strips along a direction of travel of the web; and cutting each strip along a direction substantially perpendicular to the direction of travel of the web in order to form small segments of the film that are suitably sized for ingestion.
4. The method of claim 3 further comprising the step, prior to the step of cutting, of turning each strip around a turn bar, wherein approximately one half of the series of strips are turned in one direction and all remaining strips in the series are turned in an opposite direction.
5. The method of claim 1 wherein the liner is delaminated from the film after curing.
6. The method of claim 1 wherein the liner is delaminated from the slurry of film after coating.
7. The method of claim 1 wherein a first surface of the substrate comprises a polyethylene material and a second opposing side comprising a silicone material, wherein the first surface is coated with the wet slurry.
8. The method of claim 1 wherein the step of drying further comprises the step of drying the slurry in a multizone reflow oven and varying a temperature of each zone of the oven in increasing increments.
9. The method of claim 1 wherein the step of drying further comprises the step of recirculating air flowing through the oven in order to minimize an amount of volatile active components in the coating that is flushed off the slurry.
10. The method of claim 1 wherein the step of measuring the moisture content of the film comprises the step of using an inline infra red moisture meter to traverse at least a portion of a web of the film as it exits the drying oven to measure the moisture content.
11. The method of claim 1 further comprising the step of regulating a speed of the slurry traveling through the drying oven based upon the measure moisture content of the film as the film exits the drying oven.
12. The method of claim 1 where the other components comprise cosmetic or skin care products.
13. The method of claim 12 where the polymer is a water soluble polymer, the film strip is applied to a users skin and moisture present on the users skin dissolves the polymer and releases the cosmetic or skin care product.
14. The method of claim 12 where the polymer is selected from the group consisting of water soluble polymers are pullulan, hydroxypropylethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, sodium alginate, pectin, and mixtures thereof.
15. The method of claim 14 where the polymers are selected from the group consisting of pullulan, pectin and mixtures thereof.
16. The method of claim 12 where the polymer is a low-temperature-melt polymer and the heat on the users skin melts the polymer and releases the cosmetic or skin care product.
17. The method of claim 16 where the low temperature melt polymer has a melt point in the range of from about 70 to about 95° F.