Process for manufacturing a water-soluble unit dose article

A process for manufacturing a water-soluble unit dose article having improved seal strength, wherein the water-soluble unit dose article comprises a detergent composition, the process comprising the steps of:

• a. thermoforming a first water-soluble film into a mould to create an open cavity;
• b. filling the open cavity with the detergent composition;
• c. closing the open cavity by positioning a second water-soluble film in contact with the first water-soluble film such that the second water-soluble film closes the open cavity;
• d. sealing the first film and second film together via solvent sealing, wherein the sealing solvent comprises water;
• wherein the first water-soluble film has a first water capacity, and wherein the second water-soluble film has a second water capacity, and wherein the first water capacity is different to the second water capacity, and wherein ‘water capacity’ means the capacity of the film to absorb water over a fixed period of time at a particular relative humidity and temperature, measured as a mass increase of the film being tested;
• and
• wherein the percentage difference in water capacity between the water capacity of the first water soluble film and the second water-soluble film is between about 0.01% and about 5%;
• and
• wherein the sealing solvent is applied prior to step c and the sealing solvent is applied to the film having the lowest water capacity.