| 摘要 |
The invention relates to a method of making a symmetrical three-layer paper of two heterogeneous stocks, one of which forms the top layers of the paper, and the other one forms the intermediate layer thereof. According to the invention, the top layer and substantially half the grammage of the intermediate layer are formed by co-forming in two separate head boxes, whereafter the two separately formed layers are combined at a dry solids content not exceeding 12%. |
