Paper making and fiber liberation – Processes and products – Multi-layer waterlaid webs or sheets
Patent
1997-03-06
2000-06-20
Savage, Matthew O.
Paper making and fiber liberation
Processes and products
Multi-layer waterlaid webs or sheets
162146, 162156, D21F 1114
Patent
active
06077391&
ABSTRACT:
A process for manufacturing a filter medium includes preparing a pH 3-5 aqueous suspension of cellulose fibers in a pulper or beater with a concentration of between 3% and 5%. A pH 2.8-3.8 aqueous suspension of glass fibers is prepared in a pulper or beater with a fiber concentration of between 0.5% and 1.2%. A first pulp consisting exclusively of cellulose fibers is prepared, to which a moisture-resistant resin is added. A second pulp is prepared consisting of cellulose fibers and glass fibers in proportions of between 30% and 70%, to which a moisture-resistant resin is added. Two superposed layers of the pulps are formed by methods used in paper manufacture. The two layers are collected on a layer of material able to absorb water. The two superposed layers of pulp are pressed to a pressure of between 0.1 and 1 kg/cm.sup.2. The resultant sheet is dried to a moisture content of 1%. The dried material is impregnated with a 50 wt % solution of acrylic latex, and dried again. The dried material is then wound on a reel.
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Schulmeyer, "Glass Fibers in Papermaking", Paper Trade Journal, pp. 26-27, Oct. 1956.
Savage Matthew O.
UFI Universal Filter International S.p.A.
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