KR100933462B1 - Korean paper comprising curled red algae fiber - Google Patents

Abstract

PURPOSE: Korean paper including curled red algae fiber is provided to improve dehydration property by using dehydration accelerator, and offer opacity and smoothness while offering environmentally friendly effects. CONSTITUTION: Korean paper having improved dehydration property contains curled red algae fiber of 1~50 weight% based on the whole weight of the Korean paper. The ISO whiteness of the fiber is 50~99%. The curl of the red algae fiber is formed by a kneader or a dispenser. The Korean paper has the improved dehydration property by the kneader or the dispenser.

Description

Korean paper comprising curled red algae fiber

The present invention relates to Korean paper comprising curled red algae fibers.

Hanji is a paper unique to Korea that is made from bast fibers such as mulberry, cedar, and skin. Bast fiber has a fiber length (10mm) that is much longer than that of conifers used as chemical pulp (3mm) or that of hardwoods (1mm). The castle is also excellent and can make tough paper.

Hanji has a softer texture, more flexible folding, toughness and ink staining than ordinary paper, it can express all colors, it is tough in water with its fast absorption, and it has excellent sound insulation and cold weather and warmth according to the season. Even though the characteristics of the paper does not change. In particular, Hanji is known as a paper that lasts for millennia, and the Mugujeong Clown Darni is known to have been created in the 8th century.

Traditional Korean paper is a traditional Korean paper, and the manufacturing method of traditional Korean paper is as follows.

First, raw materials of Korean paper, such as paper mulberry, trichamber and anpi, are harvested in winter. Harvested Hanji raw materials are processed at random. Dakmuji process is the process of steaming Hanji raw material using steam, to peel off the skin containing the bast fiber from the raw material. Peel off the raw material at the end of the shredding process. Peeled skin is called black skin. After washing the skin thoroughly with clear water, remove the black parts of the epidermis with a knife. The skin that has been completely cleared of black parts and dust and impurities is called white skin.

Treat the white skin mercifully. Baekpi can be treated by various medicines. For natural medicines, it is possible to use meat made by burning lye with straw, buckwheat, cotton, soybeans, peppers, and caustic soda as a general chemical. have. Self-treatment refers to the process of boiling enough meat at about 100 ℃ by adding meat or caustic soda to the white skin. Mercy-treated white skin using caustic soda, a general chemical instead of natural meat, is cleaner and easier to process, but it is not seen as a raw material of traditional paper.

Once processed, Hanji raw materials are washed to remove all soluble impurities contained in Hanji raw materials.

The bleaching process is performed on the raw material from which the soluble impurities have been removed. The bleaching process includes sunlight bleaching using sunlight and chemical bleaching using sodium hypochlorite or chlorine dioxide. When chemical bleaching is carried out, the cellulose molecular weight of the raw material of Hanji is significantly reduced, which makes it easy to lose the properties of Hanji, which has long shelf life.

After the bleaching process, the tiling process is performed to remove impurities that have not been sufficiently bleached to complete the Hanji raw material fiber treatment.

A beating step is performed on the Hanji raw material fibers. The confession process is a process of squeezing Hanji raw material fibers with a stick called Dak-Bak, which is an essential and traditional process to increase the strength of Hanji and improve the uniformity of Hanji. Recently, machines such as calviter, which shorten the length of the Hanji raw material fibers and increase the uniformity, have been used.

Put the Hanji raw material fiber in the paper container after the beating process is finished, and the Hanji is floated with a foot made of bamboo flesh. At this time, the Hanji raw material fiber is mixed with a natural additive called 'dakweed' to make Hanji. It is obtained in the form of juice from the root of a plant called Hwang Chok-gyu, and when used together with raw paper fibers, it improves the strength and uniformity of the paper. Instead of the camphor, PAM (polyacrylamide) or PEO (polyethyleneoxide) may be used. There are two ways to float Hanji, unicycle and twine, and unicycle is known as the traditional method of making Korean paper. Uni-knit can make Hanji with stronger and more uniform than twin-knit. Hanji made of unicycle or twine is drained and dried on a hot iron plate or dried on a wooden board with sunlight to complete Hanji.

When manufacturing hanji using Doc fibers, etc. by the traditional treatment process, it is possible to manufacture a hanji excellent in the strength of tensile strength, rupture strength, theft resistance and the like, and excellent preservability that can be preserved for more than 1000 years. Such Hanji has good affinity with natural phenomena such as light, wind, and moisture, so it is well-winded and absorbs moisture. The use of Korean paper is divided according to its quality and title, such as window papers on the doors, genealogies, Buddhist temples, copy papers used as old seals of ancient books, drawing papers used for drawing dead soldiers and flowers, and greeting cards. There are various kinds such as Taiji used for wedding invitations.

In recent years, traditional Korean paper has been manufactured, including waste paper and other inexpensive materials. For example, various Korean paper using citrus peel, rape powder and hemp has been developed.

However, the traditional method of manufacturing Hanji as described above is very excellent in the preservation of Hanji, but has a disadvantage in that the manufacturing process is difficult and labor costs are high.

In addition, Korean paper has a low basis weight and very low opacity. In order to increase the opacity of such paper, conventionally, it has been used by thickening the paper or adding fillers such as calcium carbonate, clay, talc and titanium dioxide. However, if the paper is made thick, the opacity can be increased, but the price becomes very high. In addition, when the filler is used, it is very difficult to continuously hold the filler in a low basis weight hanji, and even if held once, the filler contained in the hanji may come out and cause contamination by a light impact such as contact. It is very difficult to get improvement effect by being damaged.

In addition, Hanji is suitable for calligraphy using a brush, but has a problem of low smoothness for use for mass printing. Conventionally, in order to increase the smoothness of Hanji, a sheet of paste-coated paper was piled up several times and evenly squeezed with a prosthesis, thereby performing an evaporation process so that the tissue of Hanji was dense and the surface was polished. However, the doping process is uneconomical because it requires a lot of technology and manpower.

Therefore, research for improving the opacity and smoothness of Hanji is required.

Red algae, on the other hand, contain red and purple seaweeds in addition to chlorophyll, which are red or purple, and inhabit relatively deeper water than other algae, are relatively small in size, and have a variety of types of about 4000 species. Red algae have a wider range of habitat than green algae or brown algae and grow from shallow depths to deep water rays. Red algae contain a large number of fibres, called muscle muscles, which are several microns in diameter and have almost constant size in all red algae. In addition, red algae fibers have excellent whiteness and opacity, and have excellent binding ability between red algae fibers. The crystallinity of red algae fibers is similar to cellulose fibers, in particular the thermal properties of bleached red algae fibers are better than cellulose fibers. The red algae include laver, woodworm, ox radish, buckwheat, braid, thorn radish, silk grass, sackcloth, gambling, noodle sprout, stone starfish, stone and Jinuari. The internal gel extract of red algae is used as an additive in food, health supplement food, and agar material.

The inventors have invented Hanji comprising red algae fibers. By manufacturing Hanji comprising red algae fibers, it is possible to produce Hanji with excellent opacity and smoothness.

However, the hanji including the red algae fiber has excellent opacity and smoothness, but the dehydration of the red algae fiber is not very good, and thus the productivity thereof is low. In particular, when manufacturing mechanical hanji, there is a problem in mass production.

In order to improve dehydration of such red algae fibers, a dehydration accelerator composed of a polymer electrolyte may be applied. However, when the dehydration accelerator is added, not only the uniformity of Hanji is impaired, but there is a problem that the environmentally friendly nature of Hanji is impaired by the chemical additives.

To date, there have been few research and development examples applied to Hanji by improving the dehydration of red algae fibers.

Accordingly, an object of the present invention is to provide a Korean paper comprising red algae fiber having excellent opacity and smoothness and improved dehydration.

The inventors of the present invention, while studying how to improve the dehydration of the mixed red algae fiber to improve the opacity and smoothness of the hanji revealed that it can improve the dehydration by forming a curl on the fiber by a mechanical treatment, the red algae that formed the curl Hanji was prepared by mixing the fiber with the raw material fiber, and confirmed that the hanji including the red algae fiber was excellent in dehydration as well as opacity and smoothness, and completed the present invention.

The present invention provides a paper that is excellent in opacity and smoothness, including red algae fiber with improved dehydration.

The present invention relates to Korean paper with improved dehydration properties, including red algae fibers with curls.

In addition, the present invention is characterized by containing 1 to 50% by weight based on the total weight of the red algae fiber forming the curl. When it contains less than 1 weight%, the effect of the improvement of dehydration etc. is insignificant, and when it exceeds 50 weight%, it is hard to say that it shows the characteristic of Hanji.

In addition, the present invention is characterized in that the ISO whiteness of the red algae fiber formed the curl is 50 ~ 99%. If the whiteness is less than 50%, it is difficult to use as printing paper, and if it exceeds 99%, it is uneconomical because excessive chemicals and costs are required for bleaching red algae fibers.

In addition, the present invention can use a variety of methods and apparatus for the curling process, preferably characterized in that using a kneader or dispenser (Disperser).

In addition, the present invention is not particularly limited to the type of the hanji, preferably characterized in that the hanji is a recording paper or a machine hanji.

The present invention also relates to a method for manufacturing Korean paper comprising red algae fibers having curled red algae fibers to improve dehydration.

In addition, the present invention is characterized in that the curling process of the red algae fiber is using a kneader or a dispenser.

Hereinafter, the present invention will be described in detail.

Hanji according to the invention is characterized in that it comprises 1 to 50% by weight relative to the total weight of the red algae fiber with improved dehydration.

Hanji according to the present invention can be prepared in a conventional paper or a mechanical hanji through the beating process, spinning process, dehydration process and drying process by mixing the Hanji raw material fiber and red algae fiber with improved dehydration. Since the dehydration of the red algae fiber is improved in the step of stepping, it is not necessary to use a foot easily dehydrated, and it is not necessary to select and use a high dehydrating foot to control the low dehydration of the existing red algae fiber. . It can be manufactured with a paper sheet using uni-knit or twin-knit method, or can be manufactured with a mechanical sheet of paper using a paper machine.

The Hanji raw material fiber is prepared by the traditional method using bast fibers such as mulberry, cedar, bark and hemp as raw materials. In other words, one kind selected from the group consisting of mulberry, cedar, wood, and hemp is produced through raw paper mulberry process, mercy treatment, washing process, bleaching process and tigogi raw material.

The red algae fiber is prepared and used by the methods described in Korean Patent Publication Nos. 10-754890 and 10-811183. That is, the red algae are immersed in an acidic or alkaline solution for a certain time, washed with water and dehydrated, and the dehydrated red algae are immersed in an extraction solvent for a predetermined time to extract a gel, and the extracted gel is separated and the residue is subjected to several steps. Bleached, and collected and fibrized to obtain red algae fibers. The ISO whiteness of the red algae fibers thus prepared is preferably 50 to 99%, more preferably 80 to 99%. The red algae includes at least one selected from the group consisting of laver, wood starfish, ox radish, buckwheat, braid, thorny radish, silk grass, scabbard, gambling, noodle sprout, stone starfish, stone and jinari. The red algae fiber is 1 to 50% by weight, preferably 5 to 30% by weight based on the total weight of Hanji. If the content of red algae fiber exceeds 50% by weight, it is difficult to say Hanji, and less than 1% by weight does not improve the opacity and smoothness.

The red algae fiber had a disadvantage in that the dehydration of the paper was poor due to the short length and narrow width of the fiber. However, the red algae fiber was not formed when the curled and twisted curls were formed through the mechanical treatment of the present invention. Dehydration is better and there is an advantage that the opacity is further improved.

The opacity increases as the basis weight increases. Hanji containing red algae fibers with curls formed according to the present invention having improved dehydration exhibits higher opacity and smoothness than those without red algae fibers. In addition, Hanji containing red algae fibers with curls formed according to the present invention to improve the dehydration is higher opacity even if the basis weight is lower than that of Hanji comprising untreated red algae fibers.

Hanji including red algae fibers with curls formed according to the present invention with improved dehydration appear to have higher opacity and smoothness as the amount of red algae fibers increases.

Hanji containing red algae fibers incorporating curl by mechanical treatment according to the present invention is excellent in opacity and whiteness, so it is suitable as a book paper, a pre-paper, a printing paper for preservation, and can preserve the taste of Hanji as it is excellent in preservation. Therefore, it can be used as a calligraphy paper or high-quality paper.

Hereinafter, preferred examples are provided to aid in understanding the present invention. However, the following examples are merely provided to more easily understand the present invention, and the contents of the present invention are not limited by the examples.

Example 1: Hanji raw fiber manufacturing process

Soaked mulberry in water for about a day to remove the foreign matter, and easy to separate the shell peeled by steam, soaked the skin peeled for 10 hours in water and then peeled the outer skin to prepare a white skin. Soak it in water for about a day and cut it into a suitable length to prevent tangling, and boil it for 6 hours in ashes made of ash, straw, and soybeans.

Then, to remove sugar, ash, etc., other than fiber, it was immersed in flowing water for about half a day or the water was changed 2-3 times to remove the lye, followed by sunlight for about 5 days, and then decolorized until white color appeared. The daylight bleached sack was pulled out to squeeze out the water, then placed on a flat plate and struck with a bat to release the bundle of fibers and picked out the tee.

Example 2: Red Algae Fiber Extraction Process

Red algae were immersed in an acid solution of pH 2-3 for a certain time, washed with water, and dehydrated. This process removes impurities in the red algae and softens the red algae shell.

The washed and dehydrated red algae were immersed in the extraction solvent to extract the gel component contained in the red algae with the extraction solvent. At this time, the extraction solvent may be water, ethanol, methanol, acetone or ketone. Since the melting point of the gel component included in the red algae is about 60 ℃, the temperature of the extraction solvent is preferably at least 60 ℃.

After the gel extract was removed, a bleaching treatment was performed. Bleaching treatment was performed by ozone treatment, and ozone treatment was repeatedly performed until the red alga became 60 or more in terms of whiteness. Finally, hydrogen peroxide and a reducing agent were added to obtain red algae fibers with a whiteness of 70 or more.

Example 3 Process of Forming Curl on Red Algae Fiber

In order to improve the dehydration of red algae fibers, the red algae fiber stock obtained in Example 2 was concentrated to 25% by weight and fed to a kneader. At this time, if the stock concentration is less than 25% by weight, the concentration is low, the shear force may not be generated sufficiently in the kneader is undesirable, and if the concentration is too high, excessive heat is generated in the stock during the kneading treatment.

Kneading a high concentration of stock is intended to mechanically curl the red algae fibers that are not long in length. In order to form a desired curl, it is preferable to carry out the number of treatments at least once or up to six times in order to adjust the kneading time, and more preferably two to three times. In this example, three kneading treatments were performed, and the bursting strength of the stock increased by 40% and the tensile strength by about 30%.

The process temperature during the kneading treatment is preferably carried out at 60 to 70 ℃. In this example, kneading was carried out three times at 70 ° C. using a kneader of Yamamoto White Horse Co., Ltd., Japan.

White water, which had been recovered during concentration, was added to the kneaded paper stock, diluted again to adjust the concentration to 1% by weight, and completely dissociated with a stirrer of 2300 rpm for 10 minutes.

Example 4 Hanji Manufacturing Process Including Curled Red Algae Fiber

80 parts by weight of the mulberry fibers obtained in Example 1 were put in a paper container, and 20 parts by weight of red algae fibers with curls obtained in Example 3 were added thereto, followed by a conventional method, that is, beating process, extraction process, dehydration process, and drying process. Korean paper was prepared.

Comparative Example 1 Preparation of Hanji Containing Untreated Red Algae Fiber

80 parts by weight of the Doc fiber obtained in Example 1 was put in a paper container, and 20 parts by weight of the red algae fiber of Example 2, which was not subjected to the process of Example 3, were added thereto, thereby preparing a paper containing the conventional method.

Comparative Example 2: Preparation of Korean paper containing only mulberry fiber

100 parts by weight of the mulberry fiber obtained in Example 1 was put in a paper container, and a paper was prepared in a conventional manner.

Experimental Example 1 Measurement of Physical and Optical Properties of Hanji

In order to measure the physical and optical properties of the Hanji and Comparative Examples 1 and 2 according to the invention the following experiment was carried out.

Optical properties of the Hanji prepared in Example 4 and Comparative Examples 1 and 2 were measured after the humidity treatment in a constant temperature and humidity room adjusted to 23 ± 1 ℃, relative humidity 50 ± 2% according to TAPPI standard T402 om-88. Humidified specimens were measured for optical properties such as whiteness (TAPPI T 452 om-98) and opacity (TAPPI T 452 om-96) using Technidyne's Color-Touch based on the TAPPI standard.

The freeness of the stock was measured based on the Canadian Freeness Test method (TAPPI T 227 om-99) to determine the dehydration properties of the red algae fibers before and after mechanical treatment. In addition, in order to measure the dehydration of red algae fibers before and after mechanical treatment, the water retaining degree was measured based on TAPPI USEFUL METHOD UM 256. In order to measure the degree of curl exhibited by red algae fibers before and after mechanical treatment, the fiber length analyzer (MorFi) of TECHPAP was measured. The formula for calculating the curl (%) is described in FIG. 1. Curl (%) represents the overall percentage of fiber shape deviating from the straight state. Equation 1 is a formula for obtaining the curl (%), CL represents the linear distance of the fiber, P means the outer diameter.

The optical properties of Hanji are shown in Table 1 and Yeosu is shown in Table 2.

Whiteness Opacity Example 4 (Korean paper containing curl-forming red algae fiber) 80 85 Comparative Example 1 (Hangji containing untreated red algae fiber) 75 75 Comparative Example 2 (General paper mulberry) 70 65

Conservative Yeosu (mL CSF) curl(%) Example 4 4.9 100 26 Comparative Example 1 6.3 30 14

As shown in Table 1, the opacity and whiteness of the Korean paper containing the red algae fibers subjected to the mechanical treatment according to the present invention (Example 4) are compared to the traditional Korean paper containing red algae fibers (Comparative Example 1) or Korean paper containing only mulberry fiber (compared to It was significantly higher than Example 2). In general, Hanji containing red algae fiber has higher opacity and whiteness than Korean paper containing only mulberry fiber. Hanji treated with the present invention showed better opacity and whiteness than Hanji containing red algae fiber.

In addition, as shown in Table 2, red algae fibers that form curl have less water retention than 20%, and contain less water. It was shown that the dehydration of the paper manufacturing process is excellent.

As described above, the Korean paper comprising red algae fibers formed by curling by mechanical treatment according to the present invention significantly increases the opacity, whiteness, and dehydration of the Korean paper including untreated red algae fibers, thereby increasing the opacity, whiteness, and It seems to have contributed greatly to the improvement of production efficiency.

1 is an explanatory view of a method of measuring curl (%).

2 is a photograph of red algae fibers before curling.

Figure 3 is an enlarged photograph of 100% Korean paper mulberry.

Figure 4 is an enlarged photograph of Hanji made from 20% by weight of red algae fiber and 80% by weight of mulberry fiber without curling.

Figure 5 is an enlarged photograph of Hanji made from 20% by weight of red algae fibers and 80% by weight of mulberry fibers forming curls.

Claims (7)

Hanji with improved dehydration, including red algae fibers that form curls. The method according to claim 1, Hanji, characterized in that the red algae fiber forming the curl is contained 1 to 50% by weight based on the total weight of hanji. The method according to claim 1, The red algae fiber which formed the said curl is characterized in that the ISO whiteness is 50 ~ 99%. The method according to claim 1, The red algae fiber that forms the curl is Hanji, characterized in that the curl is formed using a kneader or dispenser. The method according to claim 1, The Korean paper is characterized in that the paper or mechanical paper. Hanji production method comprising red algae fibers to improve dehydration by forming curls using kneader or dispenser in the red algae fibers. delete

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