| 摘要 |
Dirtying of original by stencil comprising film impregnated with thermoplastic polymer and oil and/or plasticiser is prevented by coating one side of film with thin coating (0.5-10 g/m2) of polyvinylacetate, PVC, polyvinylidene chloride. PVA hydroxymethyl cellulose, methylmethoxylated polyhexamethylene adipic acid amide or ethyl cellulose, impermeable to impregnating substance. |
