KR101088525B1 - Method for manufacturing paper using mulberry tree - Google Patents

Abstract

The present invention relates to a method for producing white paper using mulberry, which is capable of producing white paper having excellent physical properties, such as excellent stainability and uniform surface using mulberry branches that have been disposed of in the past, and black skin obtained by peeling from mulberry branches. It is characterized by producing a white paper through the beating and papermaking process of the white skin obtained by cooking for 12 to 14 hours using a sodium hydroxide solution of 8 ~ 10 g / L concentration, and cooking for 20 to 24 hours .

Description

Method of producing white paper using mulberry trees {METHOD FOR MANUFACTURING PAPER USING MULBERRY TREE}

The present invention relates to a method for producing white paper using mulberry, which can produce white paper having excellent physical properties such as excellent stainability and uniform surface using mulberry branches that have been disposed of in the past.

The quantity of black mulberry, which is used as a raw material of Korean paper, decreases every year, and most of it is imported from Thailand. Imported bast fiber, because it grew in the tropics, causing resin failure, the situation can not add more than 30% in the manufacture of drawing paper.

Meanwhile, sheep sleep, which was one of the major sources of income in Korea's agricultural and mountain villages until the 1970s, gradually decreased due to the decrease in rural population and the development of chemical fiber. It was. However, the price of cocoon has more than doubled due to the preference for natural fiber, and recently, mulberry-related health supplements such as silkworm and mulberry have been in the spotlight. to be.

And in the case of mulberry trees, although branches are excellent fiber resources, they are currently rarely used and discarded.

The development of mulberry resources, which are by-products of sheep slums, is being developed as a high-value-added product.

It is an object of the present invention to provide a method for producing white paper using mulberry, which can produce white paper having excellent physical properties such as excellent stainability and uniform surface using mulberry branches that have been discarded in the prior art.

In order to achieve the above object, the present invention, the black skin obtained by peeling off the mulberry branches, using a sodium hydroxide solution of 8 ~ 10 g / L concentration for 12 to 14 hours, and cooked by standing for 20 to 24 hours It provides a method for producing white paper using mulberry, characterized in that the white skin obtained by the step of beating and papermaking process.

And the beating step is preferably stirred for 20 to 40 minutes at a speed of 500 ~ 600rpm in the state in which the dispersant is added to the white skin.

In addition, in the beating step, it is preferable to add 0.02% to 0.04% of a dispersant with respect to the white skin.

Hereinafter will be described in detail the method for producing white paper using the mulberry of the present invention.

In the method for producing white paper using the mulberry tree of the present invention, the black skin obtained by peeling off the mulberry branch is cooked to obtain the white skin by removing the skin, and the white skin is subjected to the beating and papermaking process.

The black skin is obtained by steaming the mulberry branches with steam in a kiln to separate the bark. Mulberry branches are better to use the mulberry branches that were discarded after pruning in terms of recycling waste resources.

And in order to remove not only the outer skin of the black skin but also the knotty scar by one step without using a separate process, the black skin is increased for 12 to 14 hours using a sodium hydroxide solution having a concentration of 8 ~ 10 g / L, 20 Leave for 24 hours and cook.

If the concentration of sodium hydroxide is less than 8 g / L, the outer skin and knots are not effectively removed, and a post-process is required to remove the knots. If the concentration is more than 10 g / L, the mulberry fibers are damaged or eluted. The yield decreases and there is a problem in that physical properties such as strength are lowered.

The white paper prepared as described above may be used for various purposes such as calligraphy paper, listed paper, and wallpaper, but is not necessarily limited thereto.

After steaming for 12 to 14 hours with sodium hydroxide solution, it is better to leave it for 20 to 24 hours to remove knot marks effectively.

Next, the white skin obtained through the cooking process is beaten.

In the case of mulberry fibers, the fiber length is roughly 17 to 32 mm, and the paper is rough in the state, and there is a problem in that the spread of ink is not uniform.

In order to obtain a uniform white paper on the surface and ink spreading, the beating step may be stirred for 20 to 40 minutes at a speed of 500 to 600 rpm with a dispersant added to the white skin. When stirring at a speed of less than 500rpm, the cut rate of the fiber is insufficient, the long fiber is present, the surface and ink spreading is not good, and when stirring at a speed of more than 600rpm, the fiber is excessively cut and a large amount of short fibers are generated There is a problem that physical properties such as lowering.

And in order to improve the dispersibility of the fiber, it is good to add 0.02% to 0.04% of the dispersant to the back skin.

The method for producing white paper using the mulberry tree of the present invention has the effect of recycling the mulberry branches that have been disposed of in the past to produce a white paper having a uniform surface, uniform spread of ink, and excellent physical properties such as strength.

Hereinafter, the method for producing white paper using the mulberry of the present invention will be described in more detail with reference to the following Examples, the scope of the present invention is not limited to the following examples.

Example 1

Mulberry branches obtained from a latent farmhouse in Buan-gun, Jeonbuk, were put in a kiln, and then cooked and peeled to obtain black skin. Then, the black skin was added to the cooking tank, and then cooked for 12 hours, and left for 24 hours to remove the skin and knots to obtain white skin.

At this time, it was cooked by adding 10 g / L sodium hydroxide solution.

After bleaching the white skin, the mixture was put in a high algae, stirred at a speed of 500 rpm, dissociated, and then papermaking was performed using a circular net paper machine, followed by compression and drying to prepare white paper. In the algae, 0.02% of dispersant was added to the white skin, and polyacrylamide (PAM) was used as the dispersant.

[Example 2]

Unlike Example 1, a white paper was prepared by cooking using a sodium hydroxide solution having a concentration of 8 g / L in the cooking process.

Example 3

Unlike Example 1, white paper was prepared by stirring at a rate of 600 rpm with 0.04% of a dispersant added to the white skin during the beating process.

Comparative Example 1

Unlike Example 1, black skin was cooked for 2 hours using a sodium hydroxide solution having a concentration of 10 g / L to prepare a white paper.

Experimental Example 1

In Examples 1 to 3 and Comparative Example 1, each white paper was visually evaluated to check whether the knotting marks and the like were effectively removed during the cooking process, and if no foreign substances such as blemishes were found on the white paper, '○', When foreign matters such as blemishes were evaluated as 'Δ' and the results are shown in Table 1 below.

Example 1 Example 2 Example 3 Comparative Example 1
Visual evaluation

○
○
○
Δ

In the case of Examples 1 to 3, the outer shell and the knotting marks were effectively removed during the cooking process, and all of them were evaluated as '○' during the visual evaluation. Knots, etc. were sparse and evaluated as 'Δ'.

Experimental Example 2 Strength Characteristics of Morphine Paper

The strength of the white paper of Examples 1 to 3 and Comparative Example 1 was measured, and the results are shown in Table 2.

Example 1 Example 2 Example 3 Comparative Example 1

burglar
(mNm ² / g)
MD

24.7
24.9
24.8
23.3
CD

22.3
22.5
22.7
21.6

As shown in Table 2, the MD (Machine direction) and the CD (Cross Directon) were 24.7 mN · m ² / g and 22.3 mN · m ² / g or more, compared to Comparative Example 1, as compared to Comparative Example 1. .

[Experimental Example 3] The inkability of the white paper

The change of ink concentration was measured using Spectrophotometer (NF 333, NIPPON DENSHOKU IND. Co., LTD.) In order to evaluate the ink repellency of each white paper of Examples 1 to 3 and Comparative Example 1. Was measured using an Image Analyzer. The results are shown in Table 3.

Example 1 Example 2 Example 3 Comparative Example 1
Ink Density
(ID)

1.475
1.453
1.467
1.349
Area of blot
(mm ² )

0.0130
0.0128
0.0135
0.0129

As shown in Table 3, in the case of Examples 1 to 3, the concentration of the ink was found to be 1.453, and the spread of the ink was larger than that of commercially available plain paper with an area of the ink of 0.0128 mm 2 or more.

Claims (3)

Peeled black mulberry peeled from the mulberry branches with a concentration of 8 ~ 10 g / L sodium hydroxide solution for 12 to 14 hours, left for 20 to 24 hours to cook the white skin obtained through the beating and papermaking process Method of producing white paper using mulberry, characterized in that to produce paper.
The method of claim 1,
The beating process is a method for producing white paper using mulberry, characterized in that for 20 to 40 minutes stirring at a speed of 500 ~ 600rpm in the state in which the dispersant is added to the white skin.
The method of claim 2,
The beating step is a method for producing white paper using mulberry, characterized in that the dispersant is added 0.02 ~ 0.04% with respect to the white skin.