Paper comprising fiber of citrus peel

The present invention relates to a paper containing citrus peel fiber, and more particularly, to a paper containing peel fiber of a citrus such as mandarin orange, lemons, orange, Kiyomi and Dekopon (Shiranuhi) together with mulberry fiber.

Traditional Korean paper, also referred to as “Hanji,” is manufactured by processing bast fiber, which is obtained from peels of paper mulberry trees or mulberry trees, and has high texture strength and excellent fibrous connection since the length of the fiber is significantly longer than those of common pulps. Common paper is hydrolyzed as time passes due to its strong acidity of about pH 4 to pH 5.5, and thus becomes less conservable. However, Korean paper has a long lifetime and remains highly hygroscopic (i.e., has high vapor transmission). In addition, Korean paper is evaluated as a high grade paper due to texture properties with natural beauty. However, the usage of Korean paper is gradually decreasing, and to date, being applied to restricted fields such as industrial arts and interiors. Thus, Korean paper merely keeps itself in existence. In order to widen the usage, various types of Korean paper are consistently introduced, which include functional Korean paper where oak charcoal, lacquer poison and the like are added.

In the meantime, a massive amount of citrus peels are produced in the course of processing citruses in Jeju, Korea. A portion of the citrus peels are utilized as feeds and herb medicines, but a majority of the citrus peels are discarded. Sometimes, the citrus peels are even thrown away illegally. Thus, it is necessary to devise an approach which can utilize the citrus peels as resources in order to prevent land and marine pollution and newly create added values.

Prior to the present invention, the inventor previously filed Korean Patent Application No. 10-2006-0004265, titled “Korean Paper Made of Citrus Peel.” In this document, the inventor proposed a Korean paper manufacturing process using the citrus peels where pulverized citrus peel powder is added in a beating procedure. Korean paper manufactured using the citrus peels assumes unique color and fragrance of citruses while maintaining the quality of common Korean paper.

However, the citrus peel power does not have excellent fibrous connection with mulberry fiber, and thus Korean paper containing the citrus peels are thicker and more bulky but have a lower density with respect to common Korean paper manufactured by inputting an adhesive material in the same amount. In addition, Korean paper containing the citrus peels also have relatively lower tensile strength, bursting strength, tear strength and folding endurance.

Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and an object of the present invention is to manufacture high grade paper, which is excellent in strength, vapor transmission and preservability, and have aesthetic colorful patterns, by using fiber produced from citrus peels as raw materials of the paper. Another object of the invention is to utilize waste outputted in the course of processing citruses as resources in order to reduce manufacturing costs while preventing pollution.

The present invention relates to a paper containing peel fiber of a citrus such as mandarin orange, lemon, orange, Kiyomi and Dekopon (Shiranuhi) together with mulberry fiber.

In the present invention, the terminology “citrus” collectively refers to mandarin orange, lemon, orange, Kiyomi, Dekopon and so on. The terminology “citrus peel fiber” collectively refers to fibers prepared by cooking peels of citruses such as mandarin orange, lemon, orange, Kiyomi and Dekopon in a sodium hydroxide solution to remove cellulose oil therefrom, cleaning the cooked citrus peels, and beating the cleaned citrus peels together with water in a beater.

In the present invention, mulberry fiber is prepared by impregnating, cooking and beating mulberry wood according to the same process as for common Korean paper.

An adhesive may be added to disperse fiber and prevent entanglement, thereby facilitating paper forming, making basis weight uniform, and enhancing paper strength. Examples of the adhesive may include polyethylene oxide (PEO), polyamide and so on.

The paper containing citrus peel fiber of the invention is manufactured by mixing an adhesive into 100 weight parts of paper mulberry fiber and 20 to 60 weight parts of citrus peel fiber, the paper mulberry fiber prepared by beating mulberry wood, the citrus peel fiber prepared from peels of citruses such as mandarin orange, lemon, orange, Kiyomi and Dekopon; and forming the mixture into paper, and compressing and drying the paper.

The paper containing citrus peel fiber of the invention is excellent in tensile strength, tear strength, bursting strength and folding endurance, and has superior preservability with pH close to neutrality. The paper containing citrus peel fiber of the invention also has a yellowish and/or reddish aesthetic color, excellent tactile sensation and high vapor transmission, and thus is adequate to be used as high grade wall paper and window paper. Furthermore, since the paper containing citrus peel fiber of the invention is manufactured by using by-products created in the course of processing citruses, it is possible to reduce manufacturing costs as well as decrease waste, thereby preventing pollution.

DESCRIPTION OF DRAWINGS

FIG. 1 is a sectional view illustrating a vapor transmission cup prepared for vapor transmission test; and

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