Coated box board or coated kraft liner and method for producing same at low cost

A kraft cardboard, low-cost technology, applied in the field of pulp and papermaking, can solve the problems of whitening effect of raw pulp, reduced mechanical properties, high production cost, etc., to achieve the goal of increasing added value, reducing consumption, and reducing negative impact Effect

CN102286897BInactive Publication Date: 2013-01-16TIANJIN UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2013-01-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

A producing method of coated box cardboard or kraft paperboard with low cost and the coated box cardboard or coated kraft paperboard produced using the method are disclosed. The method comprises steps of bottom coating with bottom coating material and surface coating with surface coating material on the recycled or unbleached box cardboard or the kraft paperboard. A double-layer or three-layer coating process is used. By means of the synergistic effect of the components in the coating layers and the different coating layers, the whitening efficiency of the optical brightening agent (OBA) in low-whiteness unbleached box cardboard is improved. The coating material is mainly composed of kaolin, carbonate, starch and latex adhesive etc. The amount of OBA is not higher than 1% of the total coating amount. The amount of titanium pigment is not higher than 5% of the total coating amount. The total coating amount of the coated box cardboard is not higher than 40g / m2, and the whiteness of the paper product is not lower than 76%.
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Description

technical field

[0001] The invention belongs to the field of pulping and papermaking, and relates to coated linerboard or kraftboard, in particular to a low-cost method for producing coated linerboard / kraftboard and the coated linerboard / kraftboard produced by the method. Background technique

[0002] Beautifully printed high whiteness coated boxboard (also known as coated kraft cardboard) is more and more widely used in commodity packaging. At present, there are two main ways to produce first-class coated boxboard or coated kraftboard (national standard GB / T 10335.5-2008 whiteness higher than 76%): one is to make paper on the surface of natural-colored boxboard Hang a layer of quantitative 30-40g / m 2 The white pulp, and then coated; the other is no white pulp, directly coated on the natural color boxboard to a whiteness higher than 76%. The production cost of the former method is relatively high, and the latter direct coating method generally requires at least 50g / m 2 If...

Examples

Embodiment 1

[0026] A method for producing coated linerboard or coated kraftboard at low cost, the steps are as follows:

[0027] (1) Using the applicator, the primer is applied at a quantitative rate of 141g / m 2 On recycled cardboard paper with a whiteness of 15.8%, the primer coating includes: 60 parts of kaolin (more than 90% less than 2 microns), 40 parts (grade 55) of calcium carbonate, 7 parts of styrene-butadiene latex, 10 parts of starch, and others Coating additives include: dispersant (sodium polyacrylate), 0.2 part; defoamer (polyethylene glycol), 0.02 part; water-resistant agent (polyamide polyurea resin), 0.5 part; lubricant (calcium stearate) , 0.5 parts.

[0028] Coating amount is 10±1g / m 2 , the solid content of the coating is 50-68% (the same below).

[0029] (2) Using an applicator, apply the top coating on the primed recycled cardboard, wherein the top coating includes: 60 parts of fine-grained kaolin (more than 92% less than 2 microns), 40 parts of 95 grade calcium c...

Embodiment 2

[0033] A method for producing coated linerboard or coated kraftboard at low cost, the steps are as follows:

[0034] (1) Using a coating device, the primer is applied at a quantitative rate of 141g / m 2 On recycled cardboard paper, the coating includes 60 parts of kaolin (more than 90% less than 2 microns), 40 parts of calcium carbonate (grade 55), 7 parts of styrene-butadiene latex, 10 parts of starch, and other commonly used coating additives such as: dispersion agent, anti-water agent, defoamer, lubricant. Coating amount is 10±1g / m 2 .

[0035] (2) Using a coating device, the top coating is coated on the primed recycled cardboard, wherein the coating includes 60 parts of fine-grained kaolin (more than 92% is less than 2 microns), 40 parts of 95 grade calcium carbonate, 12 1 part of styrene-butadiene latex, 1 part of polyvinyl alcohol (PVA, as OBA carrier), 0.6 part of 4S type fluorescent whitening agent, and other commonly used coating additives such as: dispersant, water...

Embodiment 3

[0038] A method for producing coated linerboard or coated kraftboard at low cost, the steps are as follows:

[0039](1) Using a coating device, apply the primer coating at a quantitative rate of 141g / m 2 On recycled cardboard paper, the coating includes 60 parts of kaolin, 40 parts of 55-grade calcium carbonate, 8 parts of styrene-butadiene latex, 6 parts of starch, and other commonly used coating additives such as: dispersant, water-resistant agent, defoamer, lubricant. Coating amount is 10±1g / m 2 .

[0040] (2) Using a coating device, the top coating is coated on the primed recycled cardboard, wherein the coating includes 60 parts of kaolin (more than 92% is less than 2 microns), 40 parts of 95 grade calcium carbonate, 12 parts of butyl Benzene latex, 1 part of sodium carboxymethyl cellulose (CMC), 0.6 part of 4S type fluorescent whitening agent, other commonly used coating additives such as: dispersant, water resistant agent, defoamer, lubricant. Coating amount is 17±1g...