| 摘要 |
Use of a poly(vinyl alcohol) sheet having either i) a thickness of at least 200 mum as a substrate having a reduced tendency to shrink back compared with the same poly(vinyl alcohol) sheet having a lesser thickness in a thermoforming process or ii) having a thickness of no more than 200 mum as a substrate in a vacuum forming process, to produce a pocket in a mould, wherein the mould comprises at least one protrusion or depression on at least one surface and further wherein any protrusion does not extend to or above the upper surface of the mould is provided. Also provided is process of producing a rigid pocket by a thermo-forming process or a non-rigid pocket by a vacuum-forming process. |
