| 摘要 |
<p>Heat sealable manila tissue contng. thermoplastics fibres is parchmentized and has a basic wgt. of 12 - 24 g/m2. Pref. the paper contains hydroxy ethyl cellulose. The paper is pref. parchmentized by guiding the web over a drum thorugh strong acid, then dil. acid e.g. H2SO4, then spray washing with water.</p> |
