KR20090048989A - Printing paper with increased bulk by using pearlite and its manufacturing method - Google Patents

Abstract

The present invention relates to a printing paper and a manufacturing method of the bulk increased by using a pearlite as a filler, more specifically, mainly used in the material industry, such as construction, horticulture, and the like, a mineral that has never been used in the paper industry (perlite) ) Is used as a filler in the printing paper manufacturing process, the bulk is significantly improved compared to the conventional printing paper and relates to a printing paper and a manufacturing method thereof which is very efficient in terms of paper quality and cost reduction.

Filler, Pearlite, Bulk, Printing Paper

Description

Bulking Printing Paper Using Perlite and Manufacturing Method Thereof {Manufacturing Method for Increasing Bulk of Printing Paper by Using Perlite}

The present invention relates to a printing paper and a method for producing the same, the bulk of which is increased by using pearlite as a filler.

Fillers are used in the paper industry to improve printability, optical properties and reduce costs. However, as the content of the filler increases, the paper strength or size decreases and the front and back difference increases, but the biggest problem is that the bulk of the paper decreases. This is because the specific gravity of the paper-making filler is about 2.2 or more, the density of the paper increases as the content of the filler increases and the bulk decreases. The decrease in bulk is a problem that is directly related to the increased use of pulp and is also negative in many respects because it is also related to paper properties.

Printing paper base is composed of natural pulp. First, the imported natural pulp is diluted with water, and then mechanically processed, such as a refining millstone, to increase the strength of the paper. Subsidiary materials such as fillers, retention agents, size agents and the like are added to the mechanically treated pulp. The pulp, which has undergone this process, is put into a paper-making process called paper machine, through which a base paper is formed through dehydration, compression, and drying. The base paper formed through the papermaking process is subjected to a coating machine called a size press, which is surface treated or pigment coated on the coating machine.

In particular, as pulp prices are unstable, pulp is generally used to increase filler input, but when the ash content of paper increases, the strength and size of the paper decreases and the front and back difference increases, but the biggest problem is the bulk of paper. Will decrease.

Currently used fillers include Ground Calcium Carbonate (GCC), Precipitated Calcium Carbonate (PCC), Talc, Cray, Titanium Dioxide, Calcined Clay, Synthetic Silicates, Alumina Hydroxide and Organic Pigments , Gypsum, calcium sulfate, etc., and most of these additions have a problem of a decrease in bulk, and PCC (Precipitated Calcium Carbonate), which is known to be effective in bulk, does not show a satisfactory increase in bulk. have.

In order to overcome this, it is necessary to develop a new subsidiary material, and in the present invention, it is intended to overcome the limitations of existing fillers by applying pearlite, which is a material used in building industry or horticulture industry, as an internal additive.

Accordingly, the present invention provides a printing paper and a method for manufacturing the same, which improves the bulk of the paper by uniformly dispersing pearlite having a suitable particle size and particle size distribution as a filler in water and putting it in the paper during production of the printing paper and holding it in a marsh peel. The purpose is.

The present invention

In the method for producing printing paper by molding, pressing and dewatering, drying, processing and gloss processing of a raw material mixed with a pulp filler in a paper machine,

Characterized by the method of producing a printing paper by mixing 1 to 30% by weight of perlite (Perlite) with respect to 100% by weight of the total raw material as the filler and the printing paper prepared therefrom.

In the case of the present invention, it is a technology for producing a printing paper having a higher bulk than conventional fillers by applying perlite as an internal additive to paper produced using natural pulp. This technology is expected to overcome the limitations of conventional fillers.

Therefore, it is expected to reduce the amount of expensive natural pulp by improving the bulk of the paper produced to solve the excess weight.

Hereinafter, the present invention will be described in more detail.

The present invention is mainly used in the material industry, such as construction, horticulture, and the like, and the use of perlite, a mineral that has never been used in the paper industry, as a filler in the printing paper manufacturing process, the bulk of the paper is significantly improved compared to the conventional printing paper, The present invention relates to a printing paper and a method of manufacturing the same which are very efficient in terms of quality and cost reduction.

In the present invention, perlite, an inorganic material that has never been used in the paper industry, is intended to be used as a filler in the printing paper manufacturing process. Pearlite is a high-tech material with excellent insulation, sound insulation, breathability, and moisture retention, as it expands the original volume by 10 to 20 times the volcanic stone pearlite at a high temperature of about 700 ~ 1200 ℃. The principle of expansion is that volcanic rocks generally contain 3-4% of volatiles (usually water), and the volatile content is large because pearlite contains volatiles with continuous coagulation during lake precipitation. When finely divided and roughly heated gemstone having this property (700 ~ 1200 ℃), the contained volatiles gasify and expands inside the softened particles to form internal pores, and the particles formed on the surface of the particles are ejected outwards. It expands to about 10 to 20 times its volume.

Perlite has been used mainly in the material industry, such as construction and horticulture, but it has never been used in the paper industry. In particular, the apparent specific gravity of 0.1 ~ 0.2 g / cm ³ level is lower than the conventional filling, when used as an internal filler was found to help improve the bulk.

There was also an example of applying aluminosilicate on the existing papermaking process, it could be confirmed that the bulk improvement was more excellent when using the pearlite as in the present invention.

Even when the same amount of 20 wt% was added, the bulk improvement was 4.5% for the aluminosilicate, but 11% for the pearlite, showing a lot of difference.

In order to explain in more detail, the physical properties of perlite and alumino silicate are summarized in Table 1 below.

division Perlite Alumino silicate Chemical composition SiO ₂ : 71-75% Al ₂ O ₃ : 12-18% Na ₂ O: 3-4% K ₂ O: 4-5% Fe ₂ O ₃ : 0.5-1.5% MgO: 0.1-1.5% SiO ₂ : 66-71% Al ₂ O ₃ : 9-13% Na ₂ O: 6-8% Fe ₂ O ₃ : 0.1-0.25% MgO: 1.5-2.5% Na ₂ SO ₄ : 5% Specific gravity, g / cm ³ 1.2-2.4 2.1 Outer weight, g / cm ³ 0.15 0.67 Refractive index 1.50 1.55 Ignition loss,% 1.5 8-11 Particle shape Irregular carving Aggregate form of spherical particles Manufacturing method Plastic expansion (800 ~ 1,200 ℃) Precipitation After Siliceous Reaction

As can be seen in Table 1, it was confirmed by the present inventors that in the case of the surface specific gravity, the pearlite has a lower specific gravity than the aluminosilicate, and the bulk improvement is excellent.

The manufacturing method of the printing paper according to the present invention will be described in more detail as follows.

1) Disperse pearlite uniformly in water.

When the pearlite is too high concentration may have a problem in dispersion and transport, it is preferable to disperse in water at a concentration of 5 to 15%. In addition, if the particle size of the pearlite is too large, the surface of the product may be uneven, so that the average particle size of 2 to 25 ㎛ is appropriate size in consideration of the thickness of the printing paper of 60 ~ 250 ㎛.

2) Perlite is mixed in the raw material line with 1 ~ 30% by weight based on the total raw weight in pulp, the main raw material.

The pulp is preferably Hard Wood Bleached Kraft Pulp (HW-BKP), Soft Wood Bleached Kraft Pulp (SW-BKP), Bleached Chemi Thermo Mechanical Pulp (BCTMP), or the like. In addition, when a small amount of less than 1% by weight of pearlite is used, there is little effect of the desired bulk improvement, and when it exceeds 30% by weight, there is a problem in that the strength characteristic is greatly decreased, which is not preferable.

3) Transfer the printing paper to the existing paper machine by using uniformly mixed raw materials, and then through printing, pressing, drying, coating, coating, and calendering. To produce.

Pearlite, a new material that has never been used in the paper industry as described above, has a low specific gravity, and when used as a substitute for an existing filler in the printing paper production process, it is possible to reduce the use of pulp by improving the bulk of the printing paper.

Hereinafter, the present invention will be described in more detail based on Examples, but the present invention is not limited to the following Examples.

Example  One: Pearlite  5% by weight of used printing paper

Perlite was uniformly dispersed in water at 10% concentration.

5% by weight of pearlite is mixed in the raw material line with 5% by weight of the total raw material weight to Hw-BKP (Hard Wood Bleached Kraft Pulp) pulp, and the wetland peel is formed according to TAPPI Test Method T205 sp-02 using Kumagai's water treatment machine. After pressing and dehydrating to 3.5 kgf and dried to prepare a printing paper having a basis weight of 100 g / m ² .

Example 2 Preparation of Printing Paper Using 10% by Weight of Perlite

In the same manner as in the manufacturing process of Example 1, 10% by weight of pearlite relative to the total weight of the raw material was mixed with Hw-BKP (Hard Wood Bleached Kraft Pulp) pulp to produce a printing paper having a basis weight of 100 g / m ² .

Example 3: Preparation of printing paper using 20% by weight of pearlite

In the same manner as in the production process of Example 1, 20% by weight of pearlite relative to the total weight of the raw material was mixed with Hw-BKP (Hard Wood Bleached Kraft Pulp) pulp to produce a printing paper having a basis weight of 100 g / m ² .

Comparative Example 1 Preparation of Printing Paper Using 20 wt% of GCC (Ground Calcium Carbonate)

In the same manner as in the manufacturing process of Example 1, 20 wt% of GCC relative to the total weight of the raw material was mixed with Hw-BKP (Hard Wood Bleached Kraft Pulp) pulp to produce a printing paper having a basis weight of 100 g / m ² .

Comparative Example 2: Preparation of Printing Paper Using 20% by Weight of Aluminosilicate

In the same manner as in Example 1, 20 wt% of aluminosilicate was mixed with Hw-BKP (Hard Wood Bleached Kraft Pulp) pulp based on the total weight of the raw material to prepare a printing paper having a basis weight of 100 g / m ² . .

Comparative example  3: PCC ( Precipitated Clacium Carbonate Printing paper using 20% by weight)

In the same manner as in Example 1, except that 10% by weight of PCC relative to the total weight of the raw material was mixed with Hw-BKP (Hard Wood Bleached Kraft Pulp) pulp to produce a printing paper having a basis weight of 100 g / m ² .

Comparative Example 4 Preparation of Printing Paper Using Perlite 35% by Weight

In the same manner as in the manufacturing process of Example 1, 35% by weight of pearlite relative to the total weight of the raw material was mixed with Hw-BKP (Hard Wood Bleached Kraft Pulp) pulp to produce a printing paper having a basis weight of 100 g / m ² .

Test Example 1: Physical property check

The papers of Examples 1 to 3 and Comparative Examples 1 to 4 were subjected to humidity control at 23 ° C. and 50% RH, and then the basis weight and thickness were measured to calculate bulk (bulk = thickness / base weight), and tensile strength was measured.

division Bulk (cm ³ / g) Bulk improvement rate (%) The tensile strength Example 1 1.61 3.9 -3.6% Example 2 1.64 5.8 -5.0% Example 3 1.72 11.0 -8.6% Comparative Example 1 1.55 - - Comparative Example 2 1.62 4.5 -7.1% Comparative Example 3 1.60 3.2 -14.3% Comparative Example 4 1.77 14.2 -28.6%

As can be seen in Table 2, Examples 1 to 3 was confirmed a bulk improvement of 3.9 ~ 11.0% compared to Comparative Example 1 using 20% of the existing application conditions GCC, aluminosilicate (Comparative Example 2) and When compared with the same weight% input compared with PCC (Comparative Example 3), which is known to have a good bulk effect, a bulk increase effect of 2 to 3 times was confirmed (Example 3).

In addition, Comparative Example 4, in which too much pearlite was applied, could be expected to improve additional bulk, but it was confirmed that the addition of pearlite exceeding 30% was not preferable due to excessive decrease in strength characteristics.

Example  4: Pearlite  Manufacture of printing paper using a mixture of 6 wt%

Printing paper was produced by applying pearlite in a general pod linear paper machine that produces printing paper. The raw material is 100% HW-BKP (Hard Wood Bleached Kraft Pulp), and the pearlite is dispersed at a concentration of 10% in the raw material that is being beaten in the existing pulp line and mixed uniformly in the raw material line. Chemicals such as retention agents are added to the mixed raw materials, spouted from the pod linear paper machine head box of Taekwang Machinery Co., Ltd., and then formed wetland peel in the forming process, and then pressurized to 3-4 kgf in the press process. Press-dry | dehydration was carried out while passing between rolls, and it dried while passing a dryer cylinder 100 degreeC or more. Thereafter, a printing paper having a basis weight of 150 g / m ² was manufactured through a coating process and a calendering process.

In the production of printing paper, 6% by weight of pearlite was mixed with respect to the total weight of the raw material.

Comparative Example 5: Printing paper production using existing PCC without using pearlite

In the same manner as in the manufacturing process of Example 4, but 6% by weight of the total weight of the PCC was mixed to prepare a total basis weight of 150 g / m ² of paper.

Test Example 2: Field Application Results

In the production process of printing paper, perlite was mixed to prepare paper in paper machine, the thickness and basis weight were measured, the bulk was calculated, and the tensile strength was measured.

division Bulk (cm ³ / g) Bulk improvement rate (%) The tensile strength Example 4 1.35 4.7 -6.2% Comparative Example 5 1.29 - -

As can be seen in Table 3, Example 4 was able to confirm a bulk improvement of about 5% compared to Comparative Example 5, the existing production conditions, it was confirmed that there is no excessive drop to less than 10% in the case of strength characteristics.

This is the effect of saving tens of thousands of tons of raw materials by saving 5% of raw materials at a paper mill using hundreds of thousands of tons of raw materials. This is not only economically effective but also remarkable in the situation where supply and demand of raw materials are unstable. I will.

1 is a simplified diagram showing a manufacturing process of a printing paper according to the present invention.

Claims (2)

In the method for producing printing paper by molding, pressing and dewatering, drying, processing and gloss processing of a raw material mixed with a pulp filler in a paper machine, Method for producing a printing paper, characterized in that 1 to 30% by weight of perlite (Perlite) relative to 100% by weight of the total raw material as the filler. Bulk-enhanced printing paper produced by the method of claim 1.

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