| 摘要 |
<p>1470098 Felt; roofing felt A AHLSTROM OSAKEYHTIO 26 April 1974 [4 May 1973] 18376/74 Headings D1P D1R and D2B A porous felt impregnatible with bitumen to form a roofing felt comprises uniformly dispersed glass fibres in an amount from 20-45 wt. % and wood fibres in an amount from 55-80%, based on the total wt. of fibre, and a bonding agent in an amount from 1-10 wt. %, based on the total wt. of material. The bonding agent may be a mixture of a wet-strength resin, polyvinyl acetate and starch. The felt may be made on a papermaking machine, or in a non-woven machine.</p> |
