| 摘要 |
Use of a poly(vinyl alcohol) (PVOH) sheet having a water content of at least 5wt% and a thickness of at least 200žm as a substrate having a reduced tendency to shrink back as compared to the same PVOH having a lower thickness in a thermoforming process to produce a pocket in a mould. The inside surface of the pocket may be coated with polyvinylidene dichloride or polytetrafluoroethylene. A semi-permeable or partial water barrier such as polyethylene or polypropylene or a polyacrylate may also be provided as a coating. The total water content may be more than 10, 15, 20, 25 or from 30 to 65 percent. The pocket may be filled with a composition (e.g. fabric care, surface care, dishwashing, water softening, laundry or detergent disinfectant, antibacterial, antiseptic) and sealed with a top film. A rigid sheet may be formed in a thermo-shaping process and then thermoformed into a rigid pocket. |
