Coated natural kraft and manufacturing method thereof

Abstract

The invention relates to coated natural kraft and a manufacturing method thereof. The traditional coated kraft does not have the advantages of attractive appearance, environment friendliness, high strength and good printing performance. The coated natural kraft disclosed by the invention comprises natural kraft, a surface sizing layer and a surface coating layer and is characterized in that a bottom layer comprises OCC (Old Corrugated Case) waste paper pulp and a core layer comprises waste paper; a surface layer comprises natural wood pulp and waste paper pulp, wherein the weight percentage of the natural wood pulp is 30% to 90% and the balance is the waste paper pulp; the surface sizing layer comprises a front sizing layer and a back sizing layer; and the surface coating layer comprises a bottom coating layer, a middle coating layer and a surface coating layer. The manufacturing method for the coated natural kraft sequentially comprises a natural kraft preparing working procedure, a sizing working procedure, a coating working procedure and a molding working procedure. The coated natural kraft has the advantages of reasonable structure design, attractive appearance, environment friendliness, high strength, good printing performance, simple preparation technology, low production cost and good quality.

Description

technical field [0001] The invention relates to a natural-color coated kraft cardboard and a manufacturing method thereof, belonging to the technical field of papermaking. Background technique [0002] At present, the basis weight of coated board paper on the market is high and the strength is low, and its basis weight is generally 200g / m 2 Above, the coating amount is generally 30-50 g / m 2 . Although this type of coated paper has a high whiteness on the coated surface, good ink absorption and printing gloss, and has a certain degree of stiffness and folding resistance, due to its high quantitative and large coating amount, it is different from high-strength coated paper. Compared with cloth cardboard, under the same product quantity, its strength performance is very different, and it cannot meet the high-strength packaging requirements. Moreover, compared with coated kraft cardboard, coated cardboard has low strength, so the paper machine cannot meet the requirements of ...

AI Technical Summary

Problems solved by technology

The composition of the three coating layers is as follows: the pigment of the first primer coating layer is calcium carbonate, the pigment of the second intermediate coating layer is composed of calcium carbonate and kaolin, and the pigment of the third top coating layer is composed of Calcium carbonate, kaolin and plastic pigments, because the raw materials and dosage used in the first primer coating layer, the second intermediate coating coating layer and the third top coating coating layer cannot effectively improve the quality of coated white kraft cardboard. quality, it is difficult to produce kraft cardboard with high strength and good printing performance

[0004] Although there are some coated kraft paperboards on the market, they are not as beautiful as the coated kraft paperboards that are environmentally friendly, high in strength and good in printing performance.

For example, the publication date is April 1, 2009, and the Chinese patent with the publication number CN101397765 discloses a coated kraft cardboard, which uses natural color kraft cardboard as the coated base paper, wherein, in the natural color A pigment coating containing an adhesive is formed on the kraft cardboard. The pigment coating includes a primer coating, a mid-coat pigment coating and a top coating pigment coating. Each pigment coating contains composite titanium dioxide as a pigment component. Because It is difficult to achieve the best combination of raw materials and dosage in each pigment coating, so it is difficult to produce coated kraft linerboard with high strength and good printing performance, and it is difficult to effectively improve the quality of coated kraft linerboard

[0005] To sum up, there is currently no coated kraft linerboard with exquisite appearance, green environmental protection, high strength and good printing performance.

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