FIELD: paper production; cellulose production.
SUBSTANCE: invention relates to sack paper. In the method, the multilayered paper material for use in a valve sack for a hydraulic binder includes a paper layer, such as a layer of Kraft paper, having a pre-coating layer on one side and a moisture barrier coating layer. Said pre-coating layer contains an inorganic filler and a binder in a weight ratio of from 4:1 to 20:1 calculated on the dry matter. Further, the surface density of the paper layer is 50–140 g/m2. Said multilayered paper material has an uncoated side, wherein the Cobb 60 value of the uncoated side is at least 50 g/m2.
EFFECT: sack paper is provided that decomposes in a cement mixer to an extent that does not cause any significant deterioration in product quality.
15 cl, 1 dwg, 9 tbl, 2 ex
| Title | Year | Author | Number |
|---|---|---|---|
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|
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