| 摘要 |
PURPOSE:To obtain magnetic paper having uniform quality by integrating core paper contg. fine magnetic powder and at least front paper to form the magnetic paper. CONSTITUTION:The front paper 2 and rear paper 3 are provided on both faces of the core paper 1 contg. the fine magnetic powder. The front paper 2 and rear paper 3 are prepd. as a raw material A by adding a neutral type cationic urea resin at 3% of the bone dry ratio of pulp to the raw materials formed by beating 75% N-BKP pulp and 25% L-BKP pulp in order to prevent the oxidation of the paper quality. The core paper 1 is prepd. as a raw material B by beating 85% N-BKP pulp, adding 15% ferrite of 0.8pH value and adding 1% a synthetic high polymer, i.e., carboxy methyl cellulose at 1% by the weight of the paper stock thereto in order to uniformize the fractions of the ferrite. The paper stock A is supplied as the material for the front paper 2 and rear paper 3 into a laid mold tank of a triple type paper machine. The paper stock B is supplied as the material for the core paper 1 into a short laid mold tank. Three layers are then made simultaneously to the paper, by which the magnetic paper is prepd. The stable magnetic paper which is uniformly dispersed with the magnetic powder and is integrally made of the three layers 1, 2, 3 is thus obtd.
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