KR102113396B1 - Method for producing paper using leaf of banana - Google Patents

Abstract

The present invention relates to a method for producing paper using banana leaves, and more specifically, (a) separating at least one selected from petioles and leaf veins from banana leaves, and then pulverizing with a mixer with water to prepare pulverized products. Step, (b) after removing water from the pulverized product, boiling in an aqueous solution containing citric acid, (c) dehydrating the product of step (b), (d) white water in the product of step (c) and It relates to a method for producing paper using banana leaves, comprising the step of preparing a paper porridge by adding agar as an additive and (e) forming the paper porridge and drying the paper porridge. The method for producing banana leaf paper of the present invention is excellent in eco-friendliness using natural materials such as banana leaf, citric acid, cypress water, agar. In addition, the banana leaf paper produced by the method of manufacturing the banana leaf paper of the present invention is improved in problems such as discoloration and oxidation, so that the quality of the paper is excellent.

Description

METHOD FOR PRODUCING PAPER USING LEAF OF BANANA}

The present invention relates to a method of manufacturing paper using banana leaves, and more particularly, to a method of manufacturing paper eco-friendly using natural materials such as banana leaves, citric acid, cypress water, and agar.

Previously, Hanji was immersed in a solution of caustic soda, sodium sulfite, sodium carbonate, etc. using mulberry skin, and then bleached using calcium hypochlorite, sodium hypochlorite, or sodium chlorite. It is a general manufacturing process that pulp is produced by refining or mechanical refining to make papermaking. This conventional Korean paper manufacturing method has a problem that the fastness or elasticity of the product is not good, and there is a problem that stains remain on the surface of the product due to contamination by impurities.

In order to improve the above-mentioned disadvantages of Korean paper, a small amount of general crushed wood pulp is added in addition to mulberry pulp or a filler is added, but such products adversely affect the production of calligraphy, calligraphy, etc. There is a problem that the work is inevitable and the working condition is not good.

Conventionally, a method of manufacturing paper using fruits including bananas has been reported. Specifically, Patent Publication No. 10-2014-0073799 proposes a method of manufacturing paper by crushing and then drying the peeled banana itself, followed by pressing with hot heat. However, Patent Publication No. 10-2014-0073799 manufactured edible paper that can be eaten by simply crushing and pressing various fruits or vegetables, and has no stiffness or resilience. It is impossible.

An object of the present invention is to provide a method for manufacturing banana leaf paper using natural materials such as banana leaves, citric acid, cypress water, and agar, in consideration of the problems of the prior art.

Another object of the present invention is to improve the eco-friendliness by recycling the discarded banana leaf, and at the same time do not add wood pulp, filler, etc. to improve the problem of discoloration, oxidation, etc. to provide a banana leaf paper with excellent paper quality Is to do.

The method for producing paper using banana leaves of the present invention comprises the steps of: (a) separating at least one selected from petioles and leaf veins from banana leaves, followed by grinding with a mixer to prepare pulverized products; (B) after removing water from the pulverized product, boiling in an aqueous solution containing citric acid; (c) dehydrating the product of step (b); (d) preparing paper porridge by adding cypress water and agar as an additive to the product of step (c); And (e) forming and drying the paper porridge.

In step (a), the banana leaf may be fresh banana leaf or dried in the shade for 10 to 30 days.

In step (b), the citric acid concentration of the aqueous solution may be 1 to 10 g / L.

In step (b), it can be boiled at 100 to 180 ° C for 2 to 4 hours.

The cypress water and agar may be added in a mixture of 5,000 to 15,000 parts of cypress, and 10 to 200 parts by weight of agar relative to 100 parts by weight of the product of step (c).

In the step (e), the molding may be manufactured with a thickness of 100 μm or more and 1,000 μm.

Drying in step (e) may be carried out at 20 to 250 ℃.

The present invention provides a banana leaf paper manufactured according to a method of manufacturing paper using banana leaves.

The method for producing banana leaf paper of the present invention is excellent in eco-friendliness using natural materials such as banana leaf, citric acid, cypress water, agar.

In addition, the banana leaf paper produced by the method of manufacturing the banana leaf paper of the present invention is improved in problems such as discoloration and oxidation, so that the quality of the paper is excellent.

Figure 1 shows the cellulose before and after separation from the petiole or leaf veins of banana leaves.
Figure 2 shows a banana leaf paper prepared according to Example 2 of the present invention.
Figure 3 shows a photograph after leaving the banana leaf paper prepared according to Example 2, Comparative Examples 1 and 2 for a month.

Hereinafter, the present invention will be described in detail. In describing the present invention, detailed descriptions of related well-known structures or functions may be omitted.

The terms or words used in the present specification and claims are not limited to ordinary or dictionary meanings and should not be interpreted, but should be interpreted as meanings and concepts consistent with the technical matters of the present invention.

The embodiments shown in the specification and the drawings shown in the specification are preferred embodiments of the present invention, and do not represent all of the technical spirit of the present invention, and various equivalents and modifications that can replace them at the time of this application It can be.

Hereinafter, a method of manufacturing paper using banana leaves of the present invention will be described in detail.

First, after separating one or more selected from petioles and leaf veins from banana leaves, crushed with a mixer with water Crushed  Prepare (step a).

In the banana leaf, it is not limited to the type of banana, and is used by separating the petiole or leaf vein portion containing cellulose among the banana leaves. The separated cellulose is shown in FIG. 1.

The banana leaf may be a raw banana leaf or dried in the shade for 10 to 30 days.

Next, above From ground  After removing the water, it is boiled in an aqueous solution containing citric acid (step b).

Since the pulverized material may include impurities and / or contaminants corresponding to the skin, it may be desirable to remove water by sieving.

In order to further remove the pigment after removing the water, the process of rinsing with water may be further included.

The weight of the aqueous solution is 450 to 550 parts by weight, preferably 470 to 530 parts by weight, and more preferably 500 parts by weight with respect to 100 parts by weight of the ground product from which water is removed.

The weight of the aqueous solution may vary depending on the moisture content of the pulverized product from which the water is removed. The water content of the pulverized product from which the water is removed may be 65 to 90%, preferably 75 to 85%, and more preferably 80%.

The citric acid concentration of the aqueous solution may vary depending on the moisture content of the pulverized product, and if the moisture content is low, it may be preferable to use an aqueous solution having a higher citric acid concentration.

The aqueous solution may have a citric acid concentration of 1 to 10 g / L, preferably 4 to 8 g / L, and more preferably 6 g / L.

When the citric acid concentration of the aqueous solution is less than 1 g / L, the fibers of cellulose are not melted, resulting in coarse paper and pores. When the citric acid concentration of the aqueous solution exceeds 10 g / L, the fibers of cellulose may be excessively melted and mechanical properties of the paper may be deteriorated.

The pulverized product in step (b) is boiled at 100 to 180 ° C, preferably at 130 to 150 ° C for 2 to 4 hours.

In the boiling process of step (b), the short fibers melt to become unused floating materials and oxides on paper.

The conventional method of manufacturing Korean paper uses cellulose, which is harmful to the human body, such as caustic soda, sodium sulfite, sodium carbonate, calcium hypochlorite, sodium hypochlorite, and sodium chlorite to separate cellulose and remove pigments (chlorophyll), but the present invention Silver is environmentally friendly by using mechanical grinding and citric acid.

Next, the product of step (b) is rinsed and dehydrated (step c).

A process of rinsing the product may be performed to remove the suspended solids and oxides.

The dehydration can be performed using a dehydrator.

Next, to the product of step (c) Cypress  And agar is added as an additive and then crushed. Paper die  Prepare (step d).

The cypress water may act as a preservative.

By adding the agar, cellulose is prevented from rapidly settling, and it is evenly suspended and distributed to serve to facilitate the formation of paper by the cellulose, and rupture strength, tear strength, tensile strength, anti-theft, and elongation And mechanical properties.

The cypress water and agar are added in the amount of cypress water 5,000 to 15,000 parts by weight and agar 10 to 200 parts by weight based on 100 parts by weight of the product of step (c).

In general, additives added to manufacture paper are Hwang-Gyu-Kyu and PAM (Polyacrylamide). Hwang Taegyu is difficult to cultivate, there is no cultivation farm, so supply and demand of materials is difficult, and PAM (Polyacrylamide) is a hazardous substance. Instead of this, the present invention can improve the eco-friendliness of banana leaf paper produced according to the present invention by using natural materials agar and cypress water.

Next, above Paper die  After molding, it is dried (step e).

The molding is to spread the paper evenly by using a sieve to produce a paper having a thickness of 100 μm to 1,000 μm, preferably 150 to 500 μm, and more preferably 180 to 300 μm.

The drying may be performed at 20 to 250 ° C, preferably 20 to 120 ° C, and more preferably 20 to 80 ° C.

A process of removing moisture using a vacuum dehydrator before drying may be further included.

The paper using the banana leaf of the present invention manufactured by the above-described process has excellent physical properties as compared with Korean paper, but is excellent in eco-friendliness using natural materials.

[Example]

Hereinafter, a preferred embodiment of the present invention will be described. However, this is for illustrative purposes, and the scope of the present invention is not limited thereby.

Example  One

The petiole and leaf veins are separated from the banana leaves, and cellulose is collected. The banana leaf has a long axis of 150-170 cm and a weight of 320-500 g. 22 sheets and 11,400 g were used.

The cellulose was crushed with 1 L of water in a high-speed mixer for 100 seconds, filtered through a sieve and dehydrated to a water content of 80% to obtain 8,000 g of raw material. The raw material is boiled at 140 ° C. for 5 hours in an aqueous solution containing 40 L of water and 240 g of citric acid to obtain discolored cellulose.

Next, the decolorized cellulose was rinsed with water and dehydrated to obtain 2,500 g of paper raw material.

Paper porridge was prepared by adding 100 g of the paper raw material to 10 kg of dissolved white water. The cypress water was prepared by washing the part corresponding to the leaf of the cypress tree, cooking it by low temperature pressure method, and adding 0.5 wt% of cypress oil.

Next, the paper porridge was sieved, shaken to a thickness of about 220 μm, and then moisture was removed using a vacuum dehydrator, and dried on a stainless steel drying plate at 80 ° C. to prepare banana leaf paper.

Example  2

It was prepared in the same manner as in Example 1, except that 40 g instead of agar 20 g was used.

Example  3

It was prepared in the same manner as in Example 1, except that 60 g instead of 20 g of agar was used.

Example  4

It was prepared in the same manner as in Example 1, except that 100g was used instead of 20g agar.

Comparative example  One

It was prepared in the same manner as in Example 1, except that 10 kg of water was used instead of 10 kg of agar dissolved in agar.

Comparative example  2

It was prepared in the same manner as in Example 1, except that 10 kg of cypress water without agar was used instead of 10 kg of cypress water with 20 g of agar dissolved.

[Test Example]

Test example  1: Check the mechanical properties of paper

The properties of banana leaf papers prepared according to Examples 1 to 4 and Comparative Examples 1 and 2 were measured and are shown in Table 1 below. The basis weight is KS M ISO 536: 2014, the thickness is KS M ISO 534: 2014, the density is KS M ISO 534: 2014, the tensile strength is KS M ISO 1924-3: 2016, the tear strength is KS M ISO 1974: 2014, The burst strength was measured according to KS M ISO 2758: 2016. The cut resistance was measured at a load of 0.5 kgf according to KS M ISO 5626: 2016.

division Basis weight
(g / m ² ) thickness
(mm) density
(g / cm ² ) The tensile strength
(kN / m) Tear strength
(mN) Burst strength
(kPa) Moderation
Folding endurance
left / right Example 1 40.6 0.22 0.28 1.94 230 69.0 43 Example 2 40.1 0.23 0.31 2.31 299 72.8 40 Example 3 38.5 0.21 0.29 2.14 280 73.3 34 Example 4 42.1 0.24 0.30 2.45 278 74.0 27 Comparative Example 1 45.1 0.22 0.17 1.44 204 65.9 41 Comparative Example 2 44.1 0.21 0.18 1.54 204 65 41

Referring to Table 1, it was found that the papers prepared according to Examples 1 to 4 had superior properties in comparison to the comparative examples in tensile strength, tear strength, and burst strength.

The cut resistance tends to become stiff as the amount of agar added increases, and Example 4 decreases a lot compared to Example 1, but the tensile strength and tear strength of the papers prepared according to Examples 1 to 4 with the addition of agar, It was found that the bursting strength was superior to that of the comparative example without the addition of agar.

Therefore, it was found that the banana leaf paper produced according to the present invention is environmentally friendly and excellent in mechanical properties using materials such as agar and cypress water.

Test example  2: Check discoloration characteristics

After leaving the banana leaf paper prepared according to Example 2 and Comparative Examples 1 and 2 at room temperature for one month, the presence or absence of discoloration was observed and shown in Table 2 below, and the actual picture is shown in FIG. 3.

division Discoloration Example 2 Discolor x Comparative Example 1 Discoloration o Comparative Example 2 Discolor x

3 and Table 2, it was confirmed that the banana leaf paper prepared according to Example 2 and Comparative Example 2 had little discoloration using cypress water. On the other hand, the banana leaf paper prepared according to Comparative Example 1 did not contain cypress water, and it was found that discoloration occurred.

Therefore, it was found that the banana leaf paper of the present invention has excellent mechanical properties and prevents discoloration using agar and cypress water.

Claims (8)

(A) separating at least one selected from petiole and leaf veins from banana leaves, and then pulverized with a mixer to prepare a pulverized product;
(B) after removing water from the pulverized product, boiling in an aqueous solution containing citric acid;
(c) dehydrating the product of step (b);
(d) preparing paper porridge by adding cypress water and agar as an additive to the product of step (c); And
(e) forming the paper porridge and drying it;
Method for manufacturing paper using banana leaves.
According to claim 1,
In step (a), the banana leaf is a method of manufacturing paper using banana leaves, characterized in that dried banana leaves or dried in the shade for 10 to 30 days are used.
According to claim 1,
Method of producing paper using banana leaves, characterized in that the citric acid concentration of the aqueous solution in step (b) is 1 to 10 g / L.
According to claim 1,
Method of producing paper using banana leaves, characterized in that boiled for 2 to 4 hours at 100 to 180 ° C in step (b).
According to claim 1, In step (d),
The method of producing paper using banana leaves, characterized in that the cypress water and agar are added in a mixture of 5,000 to 15,000 parts by weight, 10 to 200 parts by weight of agar, with respect to 100 parts by weight of the product of step (c).
According to claim 1,
The molding in step (e) is a method of manufacturing paper using banana leaves, characterized in that the thickness is 100 μm or more and 1,000 μm.
According to claim 1,
Drying in step (e) is a method of manufacturing paper using banana leaves, characterized in that is carried out at 20 to 250 ℃.
A banana leaf paper prepared according to the method of claim 1.

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