KR20200014492A - Method for producing paper using leaf of banana - Google Patents

Abstract

The present invention relates to a method for manufacturing paper by using banana leaves, which comprises: a step (a) of manufacturing a pulverized material by separating one or more kinds selected from a petiole and a vein from banana leaves and pulverizing the same in a mixer with water; a step (b) of removing the water from the pulverized material and boiling the same in an aqueous solution including citric acid; a step (c) of dehydrating a product of the step (b); a step (d) of manufacturing a paper mache paste by adding cypress water and agar in the product of the step (c); and a step (e) of molding and drying the paper mache paste. The present invention provides excellent eco-friendly properties by using natural materials such as banana leaves, citric acid, cypress water, and agar. Banana leaf paper manufactured by the method for manufacturing paper by using banana leaves has excellent quality by reducing problems such as discoloration, oxidation, etc.

Description

Method of manufacturing paper using banana leaves {METHOD FOR PRODUCING PAPER USING LEAF OF BANANA}

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

Traditionally, Hanji was treated by dipping in solution of caustic soda, sodium sulfite, sodium carbonate, etc., using the bark of the bark, and then bleached with calcium hypochlorite, sodium hypochlorite, or sodium chlorite. It is a general manufacturing process that pulp is manufactured and pulverized by beating or mechanical beating. The conventional Hanji manufacturing method has a problem in that the fastness or elasticity of the product is not good, and stains remain on the surface of the product due to contamination by impurities.

In order to improve the above-mentioned disadvantages of Hanji, a small amount of ordinary wood pulp, etc., or fillers are added to the mulberry pulp, but such products adversely affect the production of calligraphy, calligraphy, etc., and after a long time, discoloration and oxidation Work damage is inevitable and the work is in poor condition.

Conventionally, a method of manufacturing paper using fruits including bananas has been reported. Specifically, Patent Publication No. 10-2014-0073799 discloses a method of manufacturing paper by crushing and removing the peeled banana itself and then dried by pressing at high temperature. However, Patent Publication No. 10-2014-0073799 manufactures edible paper that can be eaten by simply crushing and squeezing various fruits and vegetables. I can't.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method of manufacturing a banana leaf paper using natural materials such as banana leaf, citric acid, cypress water, 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 leaves, and at the same time do not add the ground wood pulp, fillers, etc., the problem of discoloration, oxidation, etc. is improved to provide a banana leaf paper with excellent paper quality It is.

Method for producing a paper using a banana leaf of the present invention comprises the steps of (a) separating at least one selected from the petiole and leaf vein from the banana leaf, and then pulverized with a mixer with water to prepare a pulverized product; (b) removing water from the pulverized product and then boiling in an aqueous solution containing citric acid; (c) dehydrating the product of step (b); (d) adding cypress water and agar to the product of step (c) as an additive to prepare paper porridge; And (e) molding the paper porridge and then drying it.

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

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

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

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

Molding in the step (e) may be prepared in a thickness of 100μm or more and 1,000μm.

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

The present invention provides a banana leaf paper prepared according to the method for producing paper using a banana leaf.

Banana leaf paper manufacturing method of the present invention is excellent in environmental friendliness by using natural materials such as banana leaf, citric acid, cypress water, agar.

In addition, the banana leaf paper produced by the method for producing a banana leaf paper of the present invention is improved in the quality of paper, such as problems such as discoloration, oxidation.

Figure 1 shows the cellulose before and after separation from the petiole or leaf vein of the banana leaf.
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 one month.

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

The terms or words used in the specification and claims are not to be construed as being limited to conventional or dictionary meanings, but should be construed as meanings and concepts corresponding to the technical matters of the present invention.

The embodiments described in the specification and the configuration shown in the drawings are preferred embodiments of the present invention, and do not represent all of the technical spirit of the present invention, various equivalents and modifications that can be substituted for them at the time of the present application are There may be.

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

First, at least one selected from petiole and leaf vein is separated from the banana leaf, and then ground with a mixer with water Crushed  To manufacture (step a).

In the banana leaf, not limited to the type of banana, and used to separate the petiole or leaf vein portion containing cellulose in the banana leaf. The separated cellulose is shown in FIG.

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

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

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

In order to further remove the pigment after removing the water, the process may further include rinsing in water.

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 based on 100 parts by weight of the pulverized product from which water is removed.

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

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

When the citric acid concentration of the aqueous solution is less than 1 g / L, the fibers of the cellulose is not melted, the paper produced is rough, it may be a hole. When the citric acid concentration of the aqueous solution is more than 10 g / L, the fibers of the cellulose may be excessively melted, thereby lowering the mechanical properties of the paper.

The milled product of step (b) is boiled at 100 to 180 ℃, preferably at 130 to 150 ℃ for 2 to 4 hours.

In the boiling process of step (b), short fibers are melted to form suspended solids and oxides not used in paper.

Conventional methods of manufacturing Hanji are separated from cellulose using strong alkaline substances such as caustic soda, sodium sulfite, sodium carbonate, calcium hypochlorite, sodium hypochlorite, sodium chlorite and harmful pigments to remove pigment (chlorophyll), but the present invention Is environmentally friendly by using mechanical grinding and citric acid.

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

The process of rinsing the product to remove the suspended matter and oxide may be performed.

The dehydration may be performed using a dehydrator.

Next, the product of step (c) Cypress  And agar is added as an additive and then crushed Paper dies  To manufacture (step d).

The white water may serve as a preservative.

By adding the agar, the 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 the rupture strength, tear strength, tensile strength, abrasion resistance, and elongation rate. Etc., mechanical properties can be improved.

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

In general, additives added to make paper are Hwang Chul-gyu and Polyacrylamide (PAM). Hwang Chaek-gyu is difficult to cultivate, it is difficult to supply materials because there is no cultivation farm, PAM (Polyacrylamide) has a problem that is a harmful substance. Instead of this, the present invention can improve the environmental friendliness of the banana leaf paper produced according to the present invention by using agar and cypress water, which are natural materials.

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

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

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

The drying may further include a step of removing moisture using a vacuum dehydrator.

Paper using the banana leaf of the present invention prepared by the above-described process is excellent in environmental friendliness using natural materials while having physical properties equivalent to Korean paper.

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 thereto.

Example  One

The cellulose is collected by separating the petioles and leaf veins from the banana leaves. The banana leaf has a long axis of 150 ~ 170cm, the weight of 320 ~ 500g 22 pieces, 11,400 g was used.

The cellulose was pulverized with a high-speed mixer for 100 seconds with 1 L of water, and was sieved through a sieve to obtain 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 decolorized cellulose.

Next, the decolored cellulose was rinsed with water and then dehydrated to obtain 2,500 g of paper stock.

100 g of the raw material for the paper was added to 10 kg of cypress water in which 20 g of agar was dissolved to prepare paper porridge. The cypress water was prepared by washing the area corresponding to the leaves of the cypress, cooking by low temperature pressure method, and adding 0.5 wt% of the cypress oil.

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

Example  2

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

Example  3

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

Example  4

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

Comparative example  2

It was prepared in the same manner as in Example 1, except that 10 kg of cypress, which does not contain agar, was used instead of 10 kg of cypress, which dissolved 20 g of agar.

[Test Example]

Test Example  1: Check the mechanical properties of the paper

The properties of the banana leaf paper prepared according to Examples 1 to 4 and Comparative Examples 1 and 2 are shown in Table 1 below. Basis weight KS M ISO 536: 2014, Thickness KS M ISO 534: 2014, Density KS M ISO 534: 2014, Tensile strength KS M ISO 1924-3: 2016, Tear strength KS M ISO 1974: 2014, Burst strength was measured according to KS M ISO 2758: 2016. The theft 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) Bursting strength
(kPa) Internal theft
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 can be seen that the paper prepared according to Examples 1 to 4 has superior characteristics compared to the comparative example in tensile strength, tear strength, burst strength, and the like.

The abrasion resistance tends to be stiff as the amount of agar added increases, so that Example 4 is much lower than Example 1, but the tensile strength, tear strength, Burst strength was found to be superior to the comparative example without agar.

Therefore, the banana leaf paper prepared according to the present invention was found to be environmentally friendly and excellent in mechanical properties using materials such as agar and cypress.

Test Example  2: Confirm discoloration characteristics

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

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

Referring to Figure 3 and Table 2, the banana leaf paper prepared according to Example 2 and Comparative Example 2 was confirmed that there is almost no discoloration using the Cyclone water. On the contrary, the banana leaf paper prepared according to Comparative Example 1 did not contain cypress water and it was shown that discoloration occurs.

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

Claims (8)

(a) separating at least one selected from the petiole and leaf vein from the banana leaf, and then pulverizing with a mixer with water to prepare a pulverized product;
(b) removing water from the pulverized product and then boiling in an aqueous solution containing citric acid;
(c) dehydrating the product of step (b);
(d) adding cypress water and agar to the product of step (c) as an additive to prepare paper porridge; And
(e) molding and then drying the paper porridge;
Method for producing a paper using a banana leaf containing.
The method of claim 1,
Banana leaves in step (a) is a raw banana leaf or a method for producing paper using a banana leaf, characterized in that it used to dry in the shade for 10 to 30 days.
The method of claim 1,
Citric acid concentration of the aqueous solution in the step (b) is a method for producing paper using a banana leaf, characterized in that 1 to 10 g / L.
The method of claim 1,
Method of producing a paper using a banana leaf, characterized in that boiled for 2 to 4 hours at 100 to 180 ℃ in step (b).
The method of claim 1, wherein in step (d),
The cypress water and agar are 100 to 5 parts by weight of the product of step (c), 5,000 to 15,000 parts by weight of cyanobacteria, 10 to 200 parts by weight of agar, characterized in that the method for producing paper using a banana leaf.
The method of claim 1,
Molding in the step (e) is a method for producing paper using a banana leaf, characterized in that the thickness is produced in more than 100μm 1,000μm.
The method of claim 1,
Drying in the step (e) is a manufacturing method of paper using a banana leaf, characterized in that carried out at 20 to 250 ℃.
Banana leaf paper prepared according to the method of any one of claims 1 to 8.

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