High-intensity environment-friendly craft paper and manufacturing method thereof

Abstract

The invention relates to a high-intensity environment-friendly craft paper and a manufacturing method. Currently, the craft paper which is low in quantitation and low in wood pulp proportion, has high intensity, and is mainly made of secondary fiber is unavailable yet. The craft paper is characterized by consisting of a face layer, a core layer, a bottom layer, a front-side glue applying layer and a back-side glue applying layer; the sizing agent of the face layer is nature-color wood pulp; the sizing agent of the core layer is mid fiber and long fiber which are graded from the old corrugatedcontainer (OCC) secondary fiber; and the sizing agent of the bottom layer is short fiber which is graded from the OCC secondary fiber. The method for manufacturing the high-intensity environment-friendly craft paper comprises the steps of pulping, making glue and making paper, wherein the pulping comprises the steps of making the sizing agent of the face layer, making the sizing agent of the corelayer and making the sizing agent of the bottom layer. The craft paper is reasonable in structural design, low in quantitation, low in wood pulp proportion and high in intensity, and is mainly made of the secondary fiber. Moreover, the process is simple, the production cost is low, and the manufactured high-intensity environment-friendly craft paper has good quality.

Description

technical field [0001] The invention relates to a high-strength environment-friendly kraft cardboard and a manufacturing method thereof, belonging to the technical field of papermaking. Background technique [0002] Kraft liner board has high strength, so it has become a widely used packaging material, especially export packaging cartons have high requirements on compression resistance, and kraft liner board must be used to make cartons to meet the use requirements of cartons. [0003] At present, the commonly used kraft liner board is generally made of all wood pulp or the core layer is added with no more than 20% of secondary fiber raw materials. Since more than 80% of the raw material is wood pulp, the production cost of packaging cartons is high. In addition, due to the lack of natural wood resources in my country, high-grade commercial paper is produced by importing a large amount of commercial wood pulp every year, and the price of wood pulp raw materials is rising yea...

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 high-strength kraft cardboard

[0005] To sum up, at present, there is no kraft cardboard with low basis weight, high strength, low proportion of wood pulp, and the main raw material is made of secondary fiber, which is difficult to suit my country's national conditions.

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