Coated craft paper and production method thereof

Abstract

The invention discloses coated craft paper and a production method thereof. The coated craft paper comprises a core paper layer; the upper side of the core paper layer is a surface paper layer, and the lower side is a bottom paper layer; a coating layer is arranged on the upper surface of the surface paper layer; the bottom paper layer and the core paper layer are prepared by the steps of: dosing the waste paper, preparing waste paper pulp to obtain non-deinked waste paper pulp, and manufacturing paper through a paper layer to obtain a wet bottom paper layer and a wet core paper layer; the surface paper layer is prepared by the steps of: manufacturing paper through a paper layer by taking the UKP pulp, the non-deinked waste paper pulp or the mixture of the UKP pulp and the non-deinked waste paper pulp as the pulp to obtain a wet surface paper layer; and the wet bottom paper layer, the wet core paper layer and the wet surface paper layer are subjected to the steps of compounding with the coated body paper, preliminary drying, sizing, later drying, paper surface calendering, paper surface coating and after-treatment to obtain the coated craft paper. The available waste paper types are increased, and the fiber source is wider; and meanwhile, the quality of the waste paper pulp is effectively stabilized so as to guarantee the quality stability of the coated body paper and the white-surface craft paper and avoid easy layering, splitting and scaling.

Description

technical field

[0001] The invention relates to a kraft cardboard, in particular to a coated kraft cardboard and a production method thereof, belonging to the technical field of kraft cardboard manufacturing. Background technique

[0002] With the development of the national economy, the circulation of various commodities such as electronics, electromechanical, instrumentation, daily chemicals, clothing and textiles is increasing. Quality also puts forward higher requirements.

[0003] Traditional kraft cardboard is usually a single-layer structure formed by single-network forming. In order to increase its thickness and stiffness to provide better packaging performance, it has gradually developed into a two-layer or multi-network composite. or multi-layer structure. At present, most of the products on the market are a three-layer paper structure that is made of three forming wires and then compounded. Due to the increase in the thickness of the kraft cardboard, the strengt...

Examples

Embodiment 1

[0067] Example 1, such as figure 2 As shown, a coated kraft cardboard comprises a core paper layer 1, the upper side of the core paper layer is a face paper layer 2, the lower side is a bottom paper layer 3, and the upper surface of the face paper layer 2 is provided with three coating layers , from bottom to top are primer coat 4, middle coat 5 and top coat 6.

[0068] The production method of the above-mentioned coated kraftboard comprises: batching of waste paper, preparation of waste paper slurry, papermaking and forming, compounding of coated base paper, pre-drying, sizing, post-drying, paper surface calendering, paper surface coating , post-processing; among them,

[0069] 1. Waste paper ingredients: In order to solve the problem of multiple sources of waste paper and disordered quality in large-scale production, the mass ratio of American waste: national waste: European waste: Japanese waste is 50%: 20%: 15%: 15%. Fully mixed first, and then pulping, the uniform mixi...

Embodiment 2

[0101] Example 2, except that the following is different from Example 1, other processes are the same as in Example 1: in the step of making the bottom paper layer, 60% of medium fiber waste paper pulp and 40% of short fiber waste paper pulp; in the step of making core paper layer, Medium fiber waste paper pulp is 100%; in the step of making the face paper layer, UKP is used, that is, unbleached wood pulp is 100%; 2%, 8%, 2%; the latex is composed of 80% carboxylated styrene-butadiene latex and 20% biological latex in the primer coating, middle coating and top coating coating steps; the top coating coating step Medium adhesive composition: latex 12%, thickener 1.0%, caustic soda 0.06%, lubricant 0.7%, wet strength agent 0.9% and dispersant 0.02%.

Embodiment 3

[0102] Example 3, except for the following differences from Example 1, other processes are the same as in Example 1: in the step of making the bottom paper layer, 40% of the medium fiber waste paper pulp and 60% of the short fiber waste paper pulp; in the step of making the core paper layer, 70% of medium fiber waste paper pulp, 30% of short fiber waste paper pulp; 30% of long fiber waste paper pulp and 70% of UKP pulp in the process of making face paper layer; 4% of starch paste concentration in the sizing step, penetrant and wet strength , paper strengthening agent and starch content are 5%, 5%, 5% respectively; the latex in the primer coating, middle coating coating and top coating coating steps is composed of 60% carboxylated styrene-butadiene latex and 40% biological latex Composition: Adhesive composition in the top coat coating step: 12% latex, 1.0% thickener, 0.06% caustic soda, 0.8% lubricant, 0.8% wet strength agent and 0.03% dispersant.

technical field

[0001] The invention relates to a kraft cardboard, in particular to a coated kraft cardboard and a production method thereof, belonging to the technical field of kraft cardboard manufacturing. Background technique

[0002] With the development of the national economy, the circulation of various commodities such as electronics, electromechanical, instrumentation, daily chemicals, clothing and textiles is increasing. Quality also puts forward higher requirements.

[0003] Traditional kraft cardboard is usually a single-layer structure formed by single-network forming. In order to increase its thickness and stiffness to provide better packaging performance, it has gradually developed into a two-layer or multi-network composite. or multi-layer structure. At present, most of the products on the market are a three-layer paper structure that is made of three forming wires and then compounded. Due to the increase in the thickness of the kraft cardboard, the strengt...

Examples

Embodiment 1

[0067] Example 1, such as figure 2 As shown, a coated kraft cardboard comprises a core paper layer 1, the upper side of the core paper layer is a face paper layer 2, the lower side is a bottom paper layer 3, and the upper surface of the face paper layer 2 is provided with three coating layers , from bottom to top are primer coat 4, middle coat 5 and top coat 6.

[0068] The production method of the above-mentioned coated kraftboard comprises: batching of waste paper, preparation of waste paper slurry, papermaking and forming, compounding of coated base paper, pre-drying, sizing, post-drying, paper surface calendering, paper surface coating , post-processing; among them,

[0069] 1. Waste paper ingredients: In order to solve the problem of multiple sources of waste paper and disordered quality in large-scale production, the mass ratio of American waste: national waste: European waste: Japanese waste is 50%: 20%: 15%: 15%. Fully mixed first, and then pulping, the uniform mixi...

Embodiment 2

[0101] Example 2, except that the following is different from Example 1, other processes are the same as in Example 1: in the step of making the bottom paper layer, 60% of medium fiber waste paper pulp and 40% of short fiber waste paper pulp; in the step of making core paper layer, Medium fiber waste paper pulp is 100%; in the step of making the face paper layer, UKP is used, that is, unbleached wood pulp is 100%; 2%, 8%, 2%; the latex is composed of 80% carboxylated styrene-butadiene latex and 20% biological latex in the primer coating, middle coating and top coating coating steps; the top coating coating step Medium adhesive composition: latex 12%, thickener 1.0%, caustic soda 0.06%, lubricant 0.7%, wet strength agent 0.9% and dispersant 0.02%.

Embodiment 3

[0102] Example 3, except for the following differences from Example 1, other processes are the same as in Example 1: in the step of making the bottom paper layer, 40% of the medium fiber waste paper pulp and 60% of the short fiber waste paper pulp; in the step of making the core paper layer, 70% of medium fiber waste paper pulp, 30% of short fiber waste paper pulp; 30% of long fiber waste paper pulp and 70% of UKP pulp in the process of making face paper layer; 4% of starch paste concentration in the sizing step, penetrant and wet strength , paper strengthening agent and starch content are 5%, 5%, 5% respectively; the latex in the primer coating, middle coating coating and top coating coating steps is composed of 60% carboxylated styrene-butadiene latex and 40% biological latex Composition: Adhesive composition in the top coat coating step: 12% latex, 1.0% thickener, 0.06% caustic soda, 0.8% lubricant, 0.8% wet strength agent and 0.03% dispersant.

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