KR20100070240A - A security paper containing red algae fiber and a method for manufacturing the same - Google Patents

Abstract

The present invention relates to a security paper comprising the flushing fibers and a manufacturing method thereof.

Method for producing a security paper comprising the red fiber of the present invention, the mixed paper manufacturing step of producing a mixed paper after mixing the cotton fiber and red flush fiber; An impregnation treatment step of impregnating the prepared mixed paper with an impregnating agent containing polyvinyl alcohol, starch, gelatin; It is configured to include; drying step of drying the impregnated mixed paper; in the mixed paper manufacturing step, red fiber is characterized in that 5 to 30% by weight compared to 100% by weight of mixed paper, cotton fiber and flushing in the mixed paper manufacturing step Fiber is characterized in that it is produced by a method of lamination to form a wetland layer after dilution to 0.1 ~ 0.5% of the final feedstock concentration, or a former or circular net paper machine, cotton fiber 40 ~ 70 in the mixed paper manufacturing step It is characterized in that the solidified with a degree of freedom of SR, the impregnation treatment step while maintaining an aqueous solution of polyvinyl alcohol, starch, gelatin dissolved in 5 to 7% by weight at a temperature of 47 ~ 53 ℃, 20 After the impregnation for 40 seconds to remove the excess, 4 to 6% by weight of the borax solution is characterized in that the mixed paper for 3 to 7 seconds and then remove the excess.

According to the present invention, by mixing the cotton fibers and the flushing fibers to make a security paper, it is possible to identify the differentiation of the raw material by a microscope to facilitate the authenticity of the security paper to prevent the forgery of the paper, made of only cotton fibers Compared to the case, by mixing the finer flushing fibers, the pores are filled with the fine flushing fibers to improve the opacity without adding an inorganic filler in the same basis weight, and the increase in porosity in the change of porosity due to the wrinkle treatment is much increased. Less resistance to the wrinkle treatment is provided to provide a method for producing a durable security paper.

Description

A security paper containing red algae fiber and a method for manufacturing the same}

The present invention can be clearly distinguished that the use of red fibers in comparison with the paper made of 100% cotton fibers by mixing the red fibers in the raw material differentiation at high magnification and low magnification by the microscope, if only made of cotton fibers The opacity is higher than that of the opacity, and the decrease in opacity is small, and the increase in porosity due to the wrinkle treatment is much smaller in the change in porosity due to the wrinkle treatment, which is one of the methods for evaluating the durability of banknotes, and thus the resistance to the wrinkle treatment. The present invention relates to a security paper comprising red fiber and excellent in durability and a manufacturing method thereof.

As a technology for authenticating security papers such as banknotes, a 'security paper' (Korean Patent Publication No. 1993-0006823) applying a reflectance according to light using a metallic member and a fluorescent material has been disclosed.

In addition, as security elements, hidden pictures (silver mark, watermark), security thread (security thread) and security fiber (security yarn) have been used.

The above technologies were applied to the surface of the paper as the picture, thread, and color yarn as described above. As the anti-counterfeiting technology of paper money has developed, the counterfeit technology has been developed, and the counterfeit technology has been developed to the above factors. It is a situation that requires.

On the other hand, as a technique related to the red fiber, 'a method for producing pulp using red algae' (Korea Patent Publication No. 10-0754890), which is to make pulp using red algae, 'a method for producing pulp using thick red skin (Korean Patent Publication No. 10-0811196), Pulp made of red algae and its manufacturing method (Korean Patent Publication No. 10-0811193) and the like have been published.

These techniques are characterized in that red algae are immersed in an acidic aqueous solution to remove calcium carbonate formed on the red algae shell, and gel components are removed by a solvent to collect and remnant the residue, which is then pulped.

Such techniques are to prepare pulp using red algae using the mass productivity and eco-friendly aspects of red algae.

Despite the above-mentioned technology for flushing fiber, it has not been applied as a counterfeit prevention technology of security papers such as banknotes using red algae yet, and when mixed with cotton fiber of security paper, opacity is increased and wrinkles can be prevented. This is not known.

For the above reasons, in the manufacture of security paper, it is necessary to develop a security paper manufacturing technology including flushing fiber that can identify the counterfeit because it can give a differentiation of raw materials without significantly affecting the paper properties in the existing fiber composition. Do.

Security paper comprising the red fiber of the present invention and its manufacturing method is to solve the problems caused in the prior art as described above, by checking the differentiation of the raw material by the microscope by producing a security paper by mixing cotton fibers and red flush fibers By making it possible to facilitate the authenticity of the security paper to prevent forgery of the paper.

In addition, by mixing the finer flushing fibers compared to the case made with only cotton fibers to fill the pores with fine flushing fibers to improve the opacity without adding an inorganic filler in the same basis weight.

In addition, the increase in porosity in the change in porosity due to the wrinkle treatment is to provide a method of producing a security paper excellent in durability with excellent resistance to the wrinkle treatment.

Security paper manufacturing method comprising the flushing fiber of the present invention, in order to solve the above technical problem, a mixed paper manufacturing step of mixing the cotton fiber and the flushing fiber to produce a mixed paper; An impregnation treatment step of impregnating the prepared mixed paper with an impregnating agent containing polyvinyl alcohol, starch, gelatin; It is configured to include; drying step of drying the impregnated mixed paper.

At this time, in the mixed paper manufacturing step, the red fiber is characterized in that 5 to 30% by weight compared to 100% by weight of mixed paper.

In the mixed paper manufacturing step, the cotton fiber and the redness fiber are produced by dilution to 0.1 ~ 0.5% of the final feed concentration, and then produced by a lamination method of forming a wetland layer with a former or circular net paper machine.

In addition, the cotton fiber in the mixed paper manufacturing step is characterized in that treated by beating at 40 ~ 70 ° SR free water.

In addition, the impregnation treatment step is while impregnating the prepared mixed paper for 20 to 40 seconds while maintaining an aqueous solution of polyvinyl alcohol, starch, gelatin dissolved in 5 to 7% by weight at a temperature of 47 ~ 53 ℃, and then remove the excess, 4 to 6% by weight of the borax solution is characterized in that the mixture is impregnated for 3 to 7 seconds and then the excess is removed.

According to the present invention, it is possible to prevent the forgery of the paper by facilitating the authenticity of the security paper by making the differentiation of the raw material by the microscope by mixing the cotton fiber and the red fiber to make the security paper.

In addition, by mixing the finer flushing fibers compared to the case made with only cotton fibers it is possible to improve the opacity without the addition of an inorganic filler at the same basis by filling the pores with fine flushing fibers.

In addition, the increase in porosity in the change of porosity due to the wrinkle treatment is much less excellent resistance to the wrinkle treatment is provided a method of producing a security paper with excellent durability.

Hereinafter, a method for manufacturing a security paper including the flushing fiber of the present invention will be described in detail with reference to the accompanying drawings and photos.

1. Mixed paper manufacturing step

After mixing the cotton fibers and flushing fibers to prepare a mixed paper.

Red algae are red or purplish seas or freshwater plants, and we can easily find seaweed, wood, stone, gambling and noodles.

These red algae grow so fast that they grow up to 3-7% of their body in a day and can harvest up to five times a year.

Since there are a number of known techniques for extracting red fiber from red algae, description thereof will be omitted.

Such flushing fibers are preferably used by dissociating the purchased product in water at 1% by weight.

Cotton fibers are preferably prepared by treating the treated material with a degree of freedom (or high degree) of 40 to 70 ° SR.

After preparing the red fiber and the cotton fiber to prepare a mixed paper by mixing the cotton fiber and the red fiber, wherein the red fiber is most preferably contained 5 to 30% by weight compared to 100% by weight of the mixed paper.

The production of mixed paper is made by mixing the cotton fiber and the redness fiber and diluting it to 0.1 ~ 0.5% of the final feed concentration using water, and then manufacturing it in a grass paper or forming a wetland layer with a former or circular net paper machine. .

At this time, it is preferable to use a standard of about 150 mesh for the network inside the paper.

Specifically, after the mesh is installed in a cylinder of a certain height, a mixture of cotton fibers and redness fibers is poured into the cylinder by pouring a diluted liquid of cotton fibers and flushing fibers into the cylinder to prepare a mixed paper.

2. Impregnation Treatment Step

The prepared mixed paper is impregnated with an impregnating agent containing polyvinyl alcohol.

More specifically, the polyvinyl alcohol solution dissolved at 5 to 7% by weight was impregnated with a mixed paper prepared while maintaining the temperature of 47 to 53 ° C. for 20 to 40 seconds, and then passed through a compression roll press to remove the excess polyvinyl alcohol solution. do.

At this time, the concentration of the polyvinyl alcohol solution indicates the content of polyvinyl alcohol to water on a weight basis.

It is preferable that additives, such as urea, gelatin, and starch, are added to the said polyvinyl alcohol aqueous solution.

After impregnating the polyvinyl alcohol aqueous solution, 4 to 6% by weight of the borax solution is impregnated with the mixed paper for 3 to 7 seconds, and then passed through the compression roll press to remove the excess borax solution.

The borax solution may include, in addition to borax and water, glycerin, a thickener, and the like.

At this time, the coating amount of the impregnant is preferably to be 5 ~ 7 g / ㎡ on the dry paper dry basis.

In addition, the pressure of the compression roll press is preferably 3 to 4 kgf / cm 2.

3. Drying Step

The impregnated mixed paper is dried.

It is preferable to dry for 2-3 minutes using a dryer so that a drying temperature may be 50-120 degreeC, Preferably surface temperature is 100 degreeC.

Hereinafter, the present invention will be described in more detail with reference to the following examples and comparative examples with respect to a method for manufacturing a security paper including the redness fibers of the present invention, but the scope of the present invention is not limited thereto.

Example 1 Preparation of Security Paper Containing Flushing Fiber 1

After mixing 10% by weight of redness fiber to cotton fiber treated with 55 ± 3 ° SR, diluted to 0.5% of final paper concentration, mixed paper was prepared using laboratory circular paper.

In addition, the surface treatment solution was prepared with a polyvinyl alcohol aqueous solution dissolved at 6% by weight.

The mixed paper prepared while maintaining the surface treatment solution at 50 ± 3 ° C. was impregnated in the surface treatment solution for 30 seconds, and then pressed under the conditions of a compression roll press of 3.5 kgf / cm 2 to remove excess.

Thereafter, the mixed paper was impregnated in a borax solution having a concentration of 5% by weight for 5 seconds, and then compressed under a condition of 3.5 kgf / cm 2 of a compression roll press to remove excess.

After the impregnation process, the mixed paper was dried at 100 ° C. for 2 minutes to prepare a security paper having a basis weight of 85 ± 4 g / m 2.

Comparative Example 1 Preparation of Security Paper Made of Cotton Fiber 1

After weaving cotton fiber treated with 65 ± 3 ° SR at 0.5% final feed concentration, wetlands were prepared using a laboratory circular sheet.

(In addition, the surface treatment liquid was prepared with the polyvinyl alcohol aqueous solution melt | dissolved in 6 weight%.

The wetland prepared while maintaining the surface treatment solution at 50 ± 3 ° C. was impregnated in the surface treatment solution for 30 seconds, and then compressed under a condition of 3.5 kgf / cm 2 of a compression roll press to remove excess.

Thereafter, the mixed paper was impregnated in a 5 wt% borax solution for 5 seconds, and then compressed under a condition of 3.5 kgf / cm 2 of a compression roll press to remove excess.)

After the impregnation process, the mixed paper was dried at 100 ° C. for 2 minutes to prepare a security paper having a basis weight of 85 ± 4 g / m 2.

Experimental Example 1 Paper Physical Properties

The security papers prepared in Examples and Comparative Examples were subjected to humidity control for 24 hours at 23 ° C. and 50% of conditions, and then the opacity was measured according to ISO 2471 and shown in Table 1 below.

<Table 1> Property comparison

division
Redness fiber content (% by weight) Impregnation amount (g / m ² ) Opacity (%) Opacity Reduction ^* Paper Impregnation Paper Absolute Reduction Example 10 5.1 98.6 98.0 0.6 0.6 Comparative example 0 5.2 96.4 95.1 1.3 1.3

* It means the degree of opacity reduction after impregnation treatment on original paper.

The opacity of the paper produced in the example was 98.0%, higher than that of 95.1, which is the opacity of the paper produced in the comparative example.

In addition, in the case of reducing the opacity by the impregnation treatment, it was found that the reduction rate was much smaller than that of the comparative example.

Experimental Example 2 Evaluation of Resistance to Wrinkle Treatment

The crease treatment was performed eight times using the wrinkle apparatus as shown in FIG. 2 to measure the porosity of the Bendtsen method to evaluate the resistance to the wrinkle treatment.

As a result, it was found that the paper with 10% redness fibers was more resistant to wrinkles.

According to <Table 2> and FIG. 3 graphing the same, it was found that the degree of increase in porosity by the wrinkle treatment was much greater in the case of a comparative example consisting of cotton fibers only.

<Table 2> Porosity Change

Number of times Porosity (mL / min) Comparative example Example 0 0 0 2 5 0 4 11 4 6 20 8 8 26 12

Comparing porosity values after 8 times of goji treatment, it was 26 mL / min in the comparative example, while the value was much smaller as 12 mL / min in the example, which is excellent in resistance to wrinkle treatment and consequently excellent in durability. Could.

Experimental Example 3 Electron Microscope

The security paper of the embodiment was taken with a high magnification and a low magnification by using an electron microscope, and the photographs of FIGS. 4 and 5 were shown.

Figure 4 is a photograph of the surface observed at a high magnification (1,200 times), it can be seen that the fiber represented by ① is a redness fiber, has a large difference in the width of the fiber compared to the cotton fiber represented by ② and smooth surface.

On the other hand, the fibers marked with ② are cotton fibers, and the fibers are peeled on the surface due to mechanical treatment in a state suitable for producing paper, and a lot of fine hair is generated.

Figure 5 is a photograph of the surface of the same paper at a low magnification (200 times), it can be clearly seen the difference from the cotton fiber even at low magnification.

 That is, in the raw material differentiation by the microscope, even in the paper of the example in which 10% by weight of the flushing fibers were mixed, it was clearly distinguished that the flushing fibers were used as compared to the paper made of only 100% of the cotton fibers.

Differentiation at low magnification was excellent as well as differentiation at high magnification.

In the present invention, the security paper containing the flushing fibers may be used in the manufacture of various security paper, but most preferably used in the manufacture of banknotes or banknote paper.

1 is a process paper showing a security paper and a manufacturing method comprising the flushing fibers of the present invention.

Figure 2 is a photograph showing a wrinkle apparatus used as an experimental apparatus in the present invention.

Figure 3 is a graph showing the porosity change according to the number of times the wrinkles of the security paper containing the flushing fibers of the present invention.

Figure 4 is a photograph taken with a high magnification microscope the surface of the security paper containing the flushing fibers of the present invention.

Figure 5 is a photograph taken with a low magnification microscope the surface of the security paper containing the flushing fibers of the present invention.

Claims (6)

In the security paper manufacturing method, A mixed paper manufacturing step of preparing a mixed paper after mixing cotton fibers and flushed fibers; An impregnation treatment step of impregnating the prepared mixed paper with an impregnating agent containing polyvinyl alcohol, starch, gelatin; And a drying step of drying the impregnated mixed paper. A method of manufacturing a security paper containing redness fibers. The method of claim 1, In the mixed paper manufacturing step, the red fiber is characterized in that 5 to 30% by weight compared to 100% by weight of mixed paper, A method of manufacturing a security paper containing redness fibers. The method of claim 1, In the mixed paper manufacturing step, the mixed paper is mixed with cotton fiber and red flush fiber, and then diluted with water to a final feed concentration of 0.1 to 0.5%, and then produced in a grass paper or a wet paper layer forming a wetland layer using a former or circular net paper machine. Characterized in that manufactured by, A method of manufacturing a security paper containing redness fibers. The method of claim 1, In the mixed paper manufacturing step, the cotton fiber is treated by beating at 40 ~ 70 ° SR degree of freedom, A method of manufacturing a security paper containing redness fibers. The method of claim 1, In the impregnation treatment step, while maintaining an aqueous solution of polyvinyl alcohol, starch, gelatin dissolved at 5 to 7% by weight at a temperature of 47 to 53 ° C, the prepared mixed paper was impregnated for 20 to 40 seconds, and then excess was removed. Characterized in that to immerse the mixed paper in ~ 6% by weight of borax solution for 3 to 7 seconds and then remove the excess, A method of manufacturing a security paper containing redness fibers. In security paper, It is produced by the manufacturing method of any one of claims 1 to 5, Security paper containing redness fibers.

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