CN102286897B - Coated box board or coated kraft liner and method for producing same at low cost - Google Patents

Abstract

Translated fromChinese

本发明涉及涂布箱纸板或牛皮卡纸，尤其是一种低成本生产涂布箱纸板/牛皮卡纸的方法及该方法生产的涂布箱纸板/牛皮卡纸，包括在箱纸板或未漂白牛皮卡纸上用底涂涂料进行底涂、用面涂涂料进行面涂的步骤，所述底涂涂料中包括淀粉，所述面涂涂料中包括荧光增白剂。本发明在底涂和面涂涂料对原料没有硬性要求，在不同涂层的涂料中可以使用不同品质的颜料，可进一步节约生产成本，且每次涂布量较低，不仅利于干燥，还有利于提高生产效率。The present invention relates to coated linerboard or kraft linerboard, especially a method for producing coated linerboard/kraft linerboard at low cost and the coated linerboard/kraft linerboard produced by the method, including linerboard or unbleached A step of primer coating on kraft cardboard and top coating with a top coating, wherein the primer includes starch, and the top coating includes a fluorescent whitening agent. The present invention has no rigid requirements on the raw materials for the primer and the top coat, and pigments of different qualities can be used in the paints of different coatings, which can further save production costs, and the amount of each coating is low, which is not only beneficial to drying, but also Help to improve production efficiency.

Description

Coated box board or coating kraft liner board paper that the method for a kind of low-cost production coated box board or coating kraft liner board paper and the method are produced

Technical field

The invention belongs to the pulping and paper-making field, relate to coated box board or kraft inner paper, coated box board/kraft inner paper that especially a kind of method of low-cost production coated box board/kraft inner paper and the method are produced.

Background technology

The application of high whiteness coated box board (claiming again coating kraft liner board paper) in commodity packaging that is beautifully printed is more and more extensive.The major way of producing at present Grade A coated box board or coating kraft liner board paper (standard GB/T/T 10335.5-2008 whiteness is higher than 76%) has two kinds: a kind of is to hang up one deck on true qualities boxboard surface when copying paper quantitatively to be 30-40g/m²White slurry, then the coating; Another kind is white pulp not, directly is applied to whiteness at true qualities boxboard paint and is higher than 76%.A kind of mode production cost is higher before adopting, and a kind of direct coating method generally needs at least 50g/m after adopting²About coating weight, cause paper to become fragile, mechanical property reduces.

On the other hand, the paper of the high whiteness of most and fabric all pass through to add fluorescent whitening agent (OpticalBrightening Agent/OBA) and further improve whiteness, and still, former pulp brightness has a significant impact the whitening effect of OBA.Former pulp brightness is higher, the efficient of fluorescent whitening agent is higher, and is because lignin content is lower in the magma of higher whiteness, less with the factor of fluorescent whitening agent competition absorbing ultraviolet light, the ultraviolet light that is used for the fluorescence excitation brightening agent like this increases, and excites the blue-fluorescence of generation also to increase with regard to corresponding.It is generally acknowledged low whiteness paper particularly whiteness should not use fluorescent whitening agent at the paper pulp below 65%.

By retrieval, find that disclosed patent on April 1st, 2009 " a kind of coating kraft liner board paper " is (CN101397765A) related to the present invention, this disclosure of the Invention a kind of methods of utilizing a large amount of special composite titanium dioxides to produce coating kraft liner board papers by three layers of coating, through the above-mentioned patent of comparison and the larger difference of this patent existence.

Summary of the invention

The object of the invention is to overcome the prior art deficiency, coated box board/the kraft inner paper that provides a kind of method of low-cost production coated box board/kraft inner paper and the method to produce, the mode of the present invention mainly utilizes two-layer (two being coated with) or three layers of coating improve fluorescent whitening agent (OBA) and brighten efficient in true qualities and low whiteness paper.

The present invention realizes that the technical scheme of purpose is as follows:

The method of a kind of low-cost production coated box board or coating kraft liner board paper, be included in boxboard or do not bleach on the kraft inner paper and carry out primary coat, carry out the step that face is coated with painting coating with bottom-coating, comprise starch in the described bottom-coating, comprise fluorescent whitening agent in the described painting coating.

And described bottom-coating solid content is at 50-68%, and its coating weight is 8-18g/m², its prescription comprises that following component and mass fraction thereof are as follows:

And described painting coating solid content is at 50-68%, and its coating weight is 8-18g/m², its prescription comprises that following component and ratio of quality and the number of copies thereof are:

And, the step that is coated with in the middle of primary coat and face are coated with step, also comprising, in be coated with used in the coating solid content at 50-68%, its coating weight is 8-15g/m², comprise that component and ratio of quality and the number of copies thereof are:

And, described bottom-coating or in comprise titanium dioxide in the coating, its parts by weight are 3-10 part.

And, also comprising coating additive, coating additive comprises micro-defoamer, dispersant, water repellent agent.

A kind of coated box board/kraft inner paper is obtained by the method production of above-mentioned low-cost production coated box board/kraft inner paper.

Advantage of the present invention and good effect are:

1, the present invention utilizes the synergy between the different coating to improve fluorescent whitening agent and brighten efficient in low whiteness true qualities boxboard, in primary coat, use the starch of cheapness and environmental protection to replace expensive synthetic latex, utilize priming coat and floating coat to hide body paper, starch energy establishment fluorescent whitening agent is to the paper internal migration, raising face is coated with the function that brightens of middle fluorescent whitening agent, reduced whiteness lower body paper brightens efficient to fluorescent whitening agent inhibitory action, not only reduced production cost, also help raising face to be coated with the efficient that brightens of middle fluorescent whitening agent, the whiteness of finished product box cardboard/kraft inner paper is not less than 76%, can improve the surcharge of packaging product.

2, the present invention does not have rigid requirement in primary coat and painting coating to raw material, can use the pigment of different qualities in the coating of different coating, can further save production cost, and each coating weight is lower, not only is beneficial to drying, also helps and enhances productivity.

3, the present invention is owing to synergic whitening effect between different coating, just can obtain the coated paper of higher whiteness with lower coating weight, because total coating weight is less, reduced the negative effect of coating to the boxboard mechanical property, kept the high mechanical characteristic of boxboard/kraft inner paper, coated paper intensity all is up to state standards.

4, the present invention's starch with cheapness and environmental protection in bottom-coating replaces expensive synthetic latex, in painting coating, add fluorescent whitening agent, in coating, significantly reduce the consumption of expensive titanium dioxide, realized utilizing conventional coated paper pigment kaolin calcium carbonate under lower cost, to produce coated box board or coating kraft liner board paper.

5, the present invention has realized using conventional pigment and cheap starch to produce high whiteness coated box board, the factory that is applicable to adopt recycled pulp, timber and non-timber brown stock and other low whiteness pulp production coated papers and coated board under lower cost and low coating weight condition.

The specific embodiment

Below in conjunction with embodiment, the present invention will be further described, and following embodiment is illustrative, is not determinate, can not limit protection scope of the present invention with following embodiment.

A kind of method of low-cost production coated box board paper, relating generally to the synergy of utilizing between the different coating increases substantially OBA brighten efficient in low whiteness paper, with two be coated with or three layers of coating improve fluorescent whitening agents (OBA) do not bleach and low whiteness paper in brighten the method for efficient, realized under lower cost, producing coated box board or coating kraft liner board paper.All raw materials are the commercially available prod in following examples, all belong to chemicals for papermaking, except specified otherwise, indicate that the composition of function all has the generality of field of papermaking, do not have particularity, be techniques well known, do not list details, but all can not affect implementation of the present invention.The boxboard of not bleaching among the present invention refers to that with the boxboard that bleach regenerator OCC does not starch or unbleached paper pulp is manufactured paper with pulp, kraft inner paper refers to not bleaching the Paper or cardboard that softwood kraft pulp is manufactured paper with pulp.Following examples relate to whiteness and are the whiteness that defines among the GB/T7974-2002, and detection method is with the record in the GB, and without particular meaning, employed apparatus for coating is this area usual means, without specific (special) requirements.

Embodiment 1:

The method of a kind of low-cost production coated box board or coating kraft liner board paper, step is as follows:

(1) adopt applicator device, it quantitatively is 141g/m that bottom-coating is applied in²Whiteness be on 15.8% the regeneration boxboard, bottom-coating comprises: 60 parts of kaolin (more than 90% less than 2 microns), 40 parts of (55 grades) calcium carbonate, 7 parts of styrene-butadiene latexes, 10 parts of starch, other coating additives comprise: dispersant (Sodium Polyacrylate), 0.2 part; 0.02 part of defoamer (polyethylene glycol); Water repellent agent (polyamide carbamide resin), 0.5 part; Lubricant (calcium stearate), 0.5 part.

Coating weight is 10 ± 1g/m², the solid content of coating is 50-68% (together lower).

(2) adopt applicator device, painting coating is coated on the regeneration boxboard of primary coat, wherein painting coating comprises: 60 parts of particulate kaolin (more than 92% less than 2 microns), 40 parts of 95 grades of calcium carbonate, 12 parts of styrene-butadiene latexes, 0.6 part of 4S type fluorescent whitening agent, other coating additives comprise: dispersant (Sodium Polyacrylate), 0.2 part; 0.02 part of defoamer (polyethylene glycol); Water repellent agent (polyamide carbamide resin), 0.5 part; Lubricant (calcium stearate), 0.5 part.

Coating weight is 17 ± 1g/m², the solid content of coating is 50-68% (together lower).

(3) through after twice coating, the whiteness of coated box board is about 81.0%.Compare with the coated box board that does not add fluorescent whitening agent in the painting coating (whiteness is about 74%), whiteness has improved 7 units (seeing Table 1); Relatively, whiteness has improved 6 units with the coated box board that does not add starch in the bottom-coating (adhesive is 12 parts of styrene-butadiene latexes in the primary coat, and face is coated with 0.6 part of middle interpolation and adds fluorescent whitening agent, and whiteness is about 75%).Be not coated with the middle coated box board (whiteness is about 80%) that has added 0.6 part of OBA and 1 part of CMC (as the OBA carrier) relatively with adding starch (adhesive is 12 parts of styrene-butadiene latexes), face in the bottom-coating, whiteness has improved 1 unit, sees Table 1.This embodiment has illustrated that adding cheap environment-friendly type starch adhesive in bottom-coating not only can replace expensive synthetic latex adhesive, can also reduce the consumption of OBA carrier (CMC or PVA) expensive in the painting coating, reduce the production cost of producing high whiteness coated box board.

Embodiment 2:

The method of a kind of low-cost production coated box board or coating kraft liner board paper, step is as follows:

(1) adopt apparatus for coating, it quantitatively is 141g/m that bottom-coating is applied in²The regeneration boxboard on, wherein this coating comprises 60 parts of kaolin (more than 90% less than 2 microns), 40 parts of calcium carbonate (55 grades), 7 parts of styrene-butadiene latexes, 10 parts of starch, and other coating additives commonly used are such as dispersant, water repellent agent, defoamer, lubricant.Coating weight is 10 ± 1g/m²

(2) adopt apparatus for coating, painting coating is coated on the regeneration boxboard of primary coat, wherein this coating comprises 60 parts of particulate kaolin (more than 92% less than 2 microns), 40 parts of 95 grades of calcium carbonate, 12 parts of styrene-butadiene latexes, 1 part of polyvinyl alcohol (PVA, as the OBA carrier), 0.6 part of 4S type fluorescent whitening agent, other coating additives commonly used are such as dispersant, water repellent agent, defoamer, lubricant.Coating weight is 17 ± 1g/m²

(3) through after twice coating, become the paper whiteness can reach 83.3% (seeing Table 1), compare with the coated box board that does not add fluorescent whitening agent in the painting coating (whiteness is about 74%), whiteness has improved about 9 units.

Embodiment 3:

The method of a kind of low-cost production coated box board or coating kraft liner board paper, step is as follows:

(1) adopt apparatus for coating, it quantitatively is 141g/m that bottom-coating is coated in²The regeneration boxboard on, wherein this coating comprises 60 parts of kaolin, 40 parts of 55 grades of calcium carbonate, 8 parts of styrene-butadiene latexes, 6 parts of starch, other coating additives commonly used are such as dispersant, water repellent agent, defoamer, lubricant.Coating weight is 10 ± 1g/m²

(2) adopt apparatus for coating, painting coating is coated on the regeneration boxboard of primary coat, wherein this coating comprises 60 parts of kaolin (more than 92% less than 2 microns), 40 parts of 95 grades of calcium carbonate, 12 parts of styrene-butadiene latexes, 1 part of sodium carboxymethylcellulose (CMC), 0.6 part of 4S type fluorescent whitening agent, and other coating additives commonly used are such as dispersant, water repellent agent, defoamer, lubricant.Coating weight is 17 ± 1g/m²

(3) through after twice coating, become the paper whiteness about 82.8%, the whiteness of not adding the fluorescent whitening agent coated box board improves about 9 units.

Embodiment 4:

The method of a kind of low-cost production coated box board or coating kraft liner board paper, step is as follows:

(1) adopt apparatus for coating, it quantitatively is 141g/m that bottom-coating is coated in²The regeneration boxboard on, wherein this coating comprises 60 parts of kaolin, 40 parts of 55 grades of calcium carbonate, 8 parts of styrene-butadiene latexes, 6 parts of starch, other coating additives commonly used are such as dispersant, water repellent agent, defoamer, lubricant.Coating weight is 10 ± 1g/m²

(2) adopt apparatus for coating, painting coating is applied on the regeneration boxboard through primary coat, wherein this coating comprises 60 parts of kaolin (more than 92% less than 2 microns), 40 parts of 95 grades of calcium carbonate, 12 parts of styrene-butadiene latexes, 1 part of PVA, 0.6 part of 4S type fluorescent whitening agent, and other coating additives commonly used are such as dispersant, water repellent agent, defoamer, lubricant.Coating weight is 17 ± 1g/m²

(3) through after twice coating, the folding number that becomes paper is that 45 times, burst index are 3.02KPam²/ g, lateral loops index are 10.8N m/g, although this raw material regeneration boxboard body paper quantitatively only is 141g/m², the quantitative 168g/m of regeneration boxboard after the coating², its mechanical strength index (depending mainly on the intensity of body paper) has all reached national standard (GB/T 10335.5-2008) and to the requirement of coated box board paper, has seen Table 2.

Embodiment 5:

The method of a kind of low-cost production coated box board or coating kraft liner board paper, step is as follows:

(1) adopt and not bleach the softwood kraft pulp primary colors kraft inner paper (kraft linerboard) of manufacturing paper with pulp, the body paper of manufacturing paper with pulp quantitatively is 100 ± 2g/m², whiteness is 20.5%, and is for subsequent use as coating ox-hide card body paper.

(2) adopt apparatus for coating, bottom-coating is coated on the above-mentioned kraft inner paper, this bottom-coating comprises 60 parts of kaolin (90% less than 2 microns), 40 parts of (55 grades) calcium carbonate, 8 parts of styrene-butadiene latexes, 6 parts of starch, and other coating additives commonly used are such as dispersant, water repellent agent, defoamer, lubricant.Coating weight is 12 ± 1g/m²

(3) adopt apparatus for coating, painting coating is applied on the kraft inner paper through primary coat, wherein this painting coating comprises 60 parts of kaolin (more than 92% less than 2 microns), 40 parts of 95 grades of calcium carbonate, 12 parts of styrene-butadiene latexes, 0.8 part of CMC, 0.8 part of 4S type fluorescent whitening agent, and other coating additives commonly used are such as dispersant, water repellent agent, defoamer, lubricant.Coating weight is 17 ± 1g/m²

(4) through after twice coating, becoming the whiteness of paper is 81.5%, and folding number is that 1400 times, burst index are 4.83KPam²/ g, lateral loops index are 12.21N m/g, although that coated box board/coating brown paper quantitatively only is 129g/m², its whiteness and mechanical strength index have all reached national standard (GB/T 10335.5-2008) and to the requirement of high-quality coated box board paper, have seen Table 3.

Embodiment 6

The method of a kind of low-cost production coated box board or coating kraft liner board paper, step is as follows:

The bodystock paper of present embodiment adopts three layers of coating process to prepare the coating kraft liner board paper of high-whiteness high-strength with embodiment 5, is primarily characterized in that and has added 5 parts of titanium dioxides in bottom-coating.Coating process and formulation for coating material are as follows:

(1) adopts apparatus for coating, bottom-coating is coated on the above-mentioned kraft inner paper, and wherein this bottom-coating comprises that 5 parts of rutile type titanium whites (micron order), 60 parts of kaolin (90% less than 2 microns), 40 parts of (55 grades) calcium carbonate, 12 parts of styrene-butadiene latexes, other coating additives commonly used are such as dispersant, water repellent agent, defoamer, lubricant.Coating weight is 12 ± 1g/m²

(2) adopt apparatus for coating, coating is coated on the above-mentioned kraft inner paper in inciting somebody to action, this middle coating intermediate comprises 9 parts of starch, 6 parts of styrene-butadiene latexes, 60 parts of kaolin (90% less than 2 microns), 40 parts of (55 grades) calcium carbonate, and other coating additives commonly used are such as dispersant, water repellent agent, defoamer, lubricant.Coating weight is 10 ± 1g/m²

(3) adopt apparatus for coating, painting coating is applied on the kraft inner paper through primary coat, wherein this painting coating comprises 60 parts of kaolin (92% less than 2 microns), 40 parts of 95 grades of calcium carbonate, 12 parts of styrene-butadiene latexes, 0.8 part of CMC (OBA carrier), 0.8 part of 4S type fluorescent whitening agent, and other coating additives commonly used are such as dispersant, water repellent agent, defoamer, lubricant.Coating weight is 15 ± 1g/m²

(4) through after three coatings, becoming the whiteness of paper is 84.9%, and folding number is that 1500 times, burst index are 4.45KPam²/ g, lateral loops index are 12.36N m/g, although coated box board quantitatively only is 137g/m², its mechanical strength and whiteness index have all substantially exceeded national standard (GB/T 10335.5-2008) and to the requirement of high-quality coated box board paper, have seen Table 3.Table 2 and table 3 have shown that also the pop strength of coated box board reduces along with the increase of coating weight, have further proved under low coating weight to produce the mechanical property that high whiteness coated box board is conducive to keep boxboard.

The performance rating unit:

The application has compared the content of content of starch in the bottom-coating and the OBA content in the painting coating and carrier PVA or CMC to the impact of coating regeneration boxboard whiteness, sees Table 1; The contrast of uncoated boxboard and coated box board mechanical property and other performances sees Table 2, table 3.

Table-1: in the bottom-coating in content of starch and the painting coating OBA and carrier (PVA or CMC) content thereof on impact (total about 27 ± 3g/m of coating weight of coated box board whiteness², see example 1 and example 2).

Table-2: uncoated regeneration boxboard and coating regeneration boxboard mechanical strength performance

Table 3: uncoated kraft inner paper and two comparison that is coated with three coating kraft liner board paper performances

The used coating basic parameter of the application is:

Bottom-coating: starch adhesive; Grind (or precipitation) calcium carbonate (GCC/PCC), the particle diameter more than 55% (55 grades) is less than 2 μ m; Kaolin, more than 90% less than 2 microns; Rutile titanium dioxide, micron order; Latex adhesive (such as styrene-butadiene latex, styrene-acrylic latex, polyacrylic acid latex).

Painting coating: fluorescent whitening agent (4S/6S type, coated paper level); PVA or CMC (coating level); Grinding calcium carbonate, the powder more than 95% (95 grades) is less than 2 μ m; Particulate kaolin, the powder more than 92% is less than 2 μ m; Latex adhesive such as butylbenzene, styrene-acrylic latex, polyacrylic acid latex.

In coating: starch adhesive; Grind (or precipitation) calcium carbonate (GCC/PCC), the particle diameter more than 55% (55 grades) is less than 2 μ m; Kaolin, more than 90% less than 2 μ m; Latex adhesive is such as styrene-butadiene latex, styrene-acrylic latex, polyacrylic acid latex.Describedly two be coated with that the coating total amount is not more than 35g/m in the technique², described three are coated with in the technique coating total amount is not more than 40g/m²

Claims (5)

Translated fromChinese

1.一种低成本生产涂布箱纸板/涂布牛皮卡纸的方法，其特征在于：包括在再生箱纸板或本色箱纸板上用底涂涂料进行底涂、用面涂涂料进行面涂的步骤，所述底涂涂料中包括淀粉，所述面涂涂料中包括荧光增白剂；1. A method for low-cost production of coated liner board/coated kraft cardboard, characterized in that: comprising the process of carrying out primer coating on regenerated liner board or uncolored liner board, and carrying out top coating with top coating paint Step, comprising starch in the primer coating, comprising fluorescent whitening agent in the top coating;所述底涂涂料固含量在50-68%，其涂布量为8-18 g/m²，其配方包括如下组分及其质量份数如下：The solid content of the primer coating is 50-68%, its coating weight is 8-18 g/m² , and its formula includes the following components and their mass parts as follows:淀粉5-20 份Starch 5-20 parts碳酸钙10-90 份Calcium carbonate 10-90 parts高岭土10-70 份Kaolin 10-70 parts胶乳胶粘剂                        0-15 份；Latex adhesive 0-15 parts;所述面涂涂料固含量在50-68%，其涂布量为8-18 g/m²，其配方包括如下组分及其质量份数比为：The solid content of the top coating is 50-68%, and its coating weight is 8-18 g/m² . Its formula includes the following components and their mass-part ratios are:

2.根据权利要求1所述的低成本生产涂布箱纸板/涂布牛皮卡纸的方法，其特征在于：在底涂和面涂步骤中间还包括中涂的步骤，中涂所用中涂涂料固含量在50-68%，其涂布量为8-15 g/m²，包括组分及其质量份数比为：2. the method for producing coated linerboard/coated kraftboard at low cost according to claim 1, characterized in that: the step of intermediate coating is also included in the middle of the primer and top coating steps, and the intermediate coating used for intermediate coating The solid content is 50-68%, and the coating amount is 8-15 g/m² , including the components and their mass-number ratios:淀粉胶粘剂                5-20 份Starch adhesive 5-20 parts碳酸钙                   10-90 份Calcium carbonate 10-90 parts高岭土                    10-90 份Kaolin 10-90 parts胶乳胶粘剂                 5-15 份。Latex adhesive 5-15 parts.3.根据权利要求1所述的低成本生产涂布箱纸板/涂布牛皮卡纸的方法，其特征在于：所述底涂涂料或中涂涂料中包括二氧化钛，其重量份数为 3-10 份。3. the method for producing coated linerboard/coated kraftboard at low cost according to claim 1, is characterized in that: titanium dioxide is included in the described primer coating or intermediate coating, and its parts by weight are 3-10 share.4.根据权利要求1、2之一所述的低成本生产涂布箱纸板/涂布牛皮卡纸的方法，其特征在于：还包括常用涂料助剂，涂料助剂包括微量消泡剂、分散剂、抗水剂。4. The method for producing coated linerboard/coated kraftboard at a low cost according to one of claims 1 and 2, characterized in that: it also includes commonly used coating additives, which include trace defoamers, dispersants agent, anti-water agent.5.一种涂布箱纸板/涂布牛皮卡纸，其特征在于：由权利要求1-4之一所述的低成本生产的涂布箱纸板/涂布牛皮卡纸的方法生产得到。5. A coated linerboard/coated kraftboard, characterized in that it is produced by the method of low-cost production of coated linerboard/coated kraftboard according to any one of claims 1-4.