Process for making a water-soluble detergent pouch
A process for making a water-soluble detergent pouch containing a solid component is provided, where the process employs a scraper and a vacuum. The process includes deforming a first water-soluble film into a cavity and over a surrounding edge to form an open recess and a film-covered surrounding edge, filling the open recess with a solid component, passing a scraper over the top of the filled recess to remove some of the solid component, applying a vacuum to remove some of the solid component, and positioning a second water-soluble film to close the filled recess by sealing the second water-soluble film to the first water-soluble film.
1 . A process for making a water-soluble detergent pouch, the process comprising the steps of:
(a) placing a first water-soluble film over a mold having a cavity and a surrounding edge;
(b) deforming the first water-soluble film into the cavity and over the surrounding edge to form an open recess and a film-covered surrounding edge;
(c) filling the open recess with a solid component of a detergent composition to form a filled recess, wherein some of the solid component also spills onto the film-covered surrounding edge;
(d) passing a scraper over a top of the filled recess and a top of the film-covered surrounding edge to remove some of the solid component from the film-covered surrounding edge to form a scraped film-covered surrounding edge, wherein the first water-soluble film is free from contact with any scraper during the process;
(e) applying a vacuum to the scraped film-covered surrounding edge to remove some of the solid component from the scraped film-covered surrounding edge to form a vacuumed film-covered surrounding edge; and
(f) positioning a second water-soluble film over the filled recess and vacuumed film-covered surround edge, and closing the filled recess by sealing the second water-soluble film to the first water-soluble film present in the vacuumed film-covered surrounding edge, to form the water-soluble detergent pouch,
wherein the water-soluble detergent pouch comprises the detergent composition having the solid component that is enclosed by the first water-soluble film and the second water-soluble film.
2 . The process according to claim 1 , wherein during step (d) a distance between the scraper and the water-soluble film is from about 0.2 mm to about 1.0 mm.
3 . The process according to claim 1 , wherein during step (d) an angle of the scraper to the plane of the top of the film-covered surrounding edge is from about 80° to about 100°.
4 . The process according to claim 1 , wherein during step (d) an angle of the scraper to a machine direction is from above 0° to about 90°.
5 . The process according to claim 1 , wherein the scraper used in step (d) is a rigid blade having a chamfered tip.
6 . The process according to claim 1 , wherein during step (e), the vacuum is applied using a nozzle and wherein an average air velocity at the nozzle tip is from about 5.0 m/s to about 9.0 m/s.
7 . The process according to claim 1 , wherein during step (e) the vacuum is applied using a nozzle having a cross section of from about 0.03 m 2 to about 0.04 m 2 , and wherein an air flow through the nozzle is from about 750 m 3 /hr to about 900 m 3 /hr.
8 . The process according to claim 1 , wherein the water-soluble film is a polyvinyl alcohol film.
9 . The process according to claim 1 , wherein the water-soluble detergent pouch is a water-soluble laundry detergent pouch, and wherein the detergent composition is a laundry detergent composition.
10 . The process according to claim 1 , wherein the water-soluble detergent pouch is a water-soluble automatic dishwashing detergent pouch, and wherein the detergent composition is an automatic dishwashing detergent composition.
11 . The process according to claim 1 , wherein the second water-soluble film comprises one or more pre-formed compartments.
12 . The process according to claim 11 , wherein the one or more pre-formed compartments contain a liquid component of the detergent composition.
13 . The process according to claim 1 , wherein the process is a continuous process, wherein the molds are placed on a moving conveyor that passes underneath the scraper during step (d), and underneath the vacuum during step (e).
14 . The process according to claim 1 , wherein one scraper is positioned across multiple rows.
15 . The process according to claim 1 , wherein one vacuum is positioned across multiple rows.