AU2008283139B2

AU2008283139B2 - Wrapping/packing paper, corrugated board box, and method of manufacturing improved base paper

Info

Publication number: AU2008283139B2
Application number: AU2008283139A
Authority: AU
Inventors: Yong-Su Ha
Original assignee: POWERPAC CO Ltd
Current assignee: POWERPAC CO Ltd
Priority date: 2007-07-30
Filing date: 2008-07-30
Publication date: 2011-05-12
Anticipated expiration: 2028-07-30
Also published as: WO2009017359A2; WO2009017359A3; AU2008283139A1; CN101743360A

Description

WO 2009/017359 PCT/KR2008/004435 TITLE: WRAPPING/PACKING PAPER, CORRUGATED BOARD BOX, AND METHOD OF MANUFACTURING IMPROVED BASE PAPER 5 Technical Field The present invention relates to a wrapping/packing paper, a packing case and a method of manufacturing an improved base paper, and more particularly, to a corrugated board containing fly ash which is a waste matter resulted from fuel combustion in a thermo power station, a corrugated board box using the same and a 10 method of manufacturing the same. Background Art Contents such as fruits or vegetables are generally wrapped by a paper or packed by a paper case when the contents are carried or kept. In this instance, 15 since the paper or paper case absorbs moistures from the fruits or vegetables, the freshness of the fruits or vegetables is rapidly depreciated, shriveled or spoiled, thereby deteriorating the goods value. Therefore, there is a problem that it is difficult to keep the fruits or vegetables in a wrapped or packed state. The wrapping paper is made in a pocket shape in order to protect fruits by 20 wrapping the fruits up in paper when fruits are cultivated, in addition to the application of packing the fruits or vegetables. In this instance, the paper can protect the fruits against insect pets, but it does not permit the sunlight to transmit. Therefore, the wrapping paper does not significantly contribute to the quality of the fruits of vegetables. 25 In addition to the above method, a paper coated with charcoal has been 1 WO 2009/017359 PCT/KR2008/004435 proposed to maintain the freshness of fruits or vegetables. Function of the charcoal is lost due to a process of powdering the charcoal, thereby obtaining the function of the charcoal. Specifically, since crystals generated by powdering the charcoal are mixed with an adhesive, a porous property of the charcoal is lost, and its expense is 5 increased by the powdering operation of the charcoal. A box coated with wax for agricultural and marine products has been proposed to prevent moisture absorption. The box coated with wax is mainly used due to its inexpensive, although it is harmful to a human body. A paper coated with less powder has been proposed. Since it is difficult to 10 powder the less, a cost of the less powder is raised. Thus, its use is not widely spread in terms of its performance-per-cost. Corrugated board packing is utilized in whole packing manner, such as unit packaging, internal packing, external packing, and freight transportation. Such a corrugated board has advantages of moderate prices, good uniformity, high strength 15 per unit weight, good adhesiveness and printability, relatively high adaptability for low temperature, inodorous and non-venomous property, excellent automatically packing property, good shape maintenance, good environmental adaptation, recyclability of waste and so forth. Therefore, the corrugated board occupies a high position in a field of packing material. 20 Among defectives occurring in the process of manufacturing the corrugated board, a warp phenomenon (defection, twisting and deformation) is known as the major problem related to the quality of the corrugated board. The warp of the corrugated board is a state of being twisted or bent out of shape, so that the corrugated board is not formed as a flat board, but bent in an arc shape. The warp 25 is caused by irregular distribution of moisture in a base paper and uneven 2 WO 2009/017359 PCT/KR2008/004435 smoothness of the surface of the base paper. The warp may be caused by unbalanced thermal distribution at drying after the corrugated board is manufactured. The warp causes that a corrugated board cannot be input in a printing machine when manufacturing a corrugated board box, or leads to twisting of the base paper after 5 the base paper is put in the printing machine, thereby degrading the printing. Also, when a manila printed in color and the corrugated board are laminated, the base paper is distorted when it is put in a laminating machine. Therefore, it is impossible to laminate them. Humidifying and preheating equipments have been introduced in the 10 manufacturing process so as to improve the warp. Also, a method of mutually engaging corrugated boards has been proposed to address the above problem. The mutual engagement is concomitant with the manual operation to turn over the base paper of the corrugated board. There are problems of a lot of dust, noise exceeding a reference level, industrial disaster, and productivity reduced by high 15 labor costs. In order to address the above problems, a patent entitled "apparatus and method for turning over corrugated board to prevent warp" is disclosed in Korean Patent Registration No. 10-0673602. However, the patent leads to introduction of other equipment to incur addition costs, and thus it is not an ultimate solution. Consequently, measures to address the above problems should be 20 necessary. Korea depends on imports of pulp and old corrugated board which are raw materials of base paper. As the demand of pulp and old corrugated board is dramatically increased in China, costs of the pulp and old corrugated boards are sharply raised. As a result, methods of reducing use amounts of the pulp and old 25 corrugated boards are continuously trying to figure out the best way. That is, an 3 WO 2009/017359 PCT/KR2008/004435 urgent task is to find substitutes for the pulp and old corrugated boards. Meanwhile, since a lot of fly ash which is a waste matter resulted from fuel combustion in a thermo power station is generated by thermo power stations, it is difficult to keep and handle the fly ash. Also, since the fly ash has fine grain size, 5 the fly ash scattered by strong wind causes serious damage to the living environments and the crops. Thus, a measure to address the problems is required. Although it attempts to utilize the fly ash of industrial waste in other industries, a portion of cement is replaced by the use of fly ash. However, researches in the fly ash and commercial use in the fly ash are very slight. 10 Disclosure Technical Problem Therefore, the present invention has been made in view of the above mentioned problems. 15 An object of the present invention is to provide a wrapping/packing paper and a packing case using the same which can maintain freshness of fruits or vegetables, increase a sterilization effect, cope with the change of regional distinctive fruits due to global worming, and accelerate the growth of fruits by interrupting a part of solar heat and sunlight and radiating far-infrared using indirect heat to increase a sugar content 20 of a fruit. Also, it can increase the freshness of meat and fish and maintain taste and quality thereof by using the wrapping/packing paper as a packing case for fish or meat products and frozen foods. Another object of the present invention is to remarkably reduce a warp 25 phenomenon of a corrugated board by using pozzolanic reaction induced by fly ash, 4 WO 2009/017359 PCT/KR2008/004435 in which inexpensive fly ash of industrial waste is put in a step of manufacturing a base paper, and formation of a coating layer for blocking moistures to be absorbed from an exterior. Yet another object of the present invention is to reduce a manufacturing cost 5 of base paper and improve a quality of a paper. A price and quality of the base paper for all papers are depended upon its strength and weight. In case of manufacturing a base paper using recycled waste papers, since the waste papers are finely grinded and are repeatedly used, its fibrous tissue is broken so that its strength is dramatically decreased. The present invention manufactures a base 10 paper for a corrugated board box by adding the fly ash to the raw material to increase strength and weight of the base paper, thereby reducing a use amount of pulp or waste papers and thus promoting the reduced manufacturing costs of the base paper and the improved quality of a paper. Also, tangerine peels are buried in the ground or are dumped in the sea at 15 present. Although the tangerine peels are mixed with old corrugated boards to manufacture the base paper, it is hard to produce the base paper in quantity because the tangerine peels generate strong acid gas. It is yet further object of the present invention to carry out commercial mass production of a functional base paper mixed with tangerine peels by neutralizing acid material with the fly ash. 20 Technical Solution In order to achieve the above and other objects, there is provided a wrapping/packing paper including pulp as a major component, the packing paper comprising fly ash resulted from coal combustion and mixed with the pulp. 25 According to another aspect of the present invention, there is provided a 5 WO 2009/017359 PCT/KR2008/004435 wrapping/packing paper comprising at least one surface thereof coated with a coating solution consisting of fly ash resulted from coal combustion and an adhesive. According to another aspect of the present invention, there is provided a paper packing case including a receptacle for accommodating contents therein, an 5 inner surface of the receptacle being coated with a coating solution consisting of fly ash resulted from coal combustion and an adhesive. According to another aspect of the present invention, there is provided a corrugated board box including a front paper, a corrugated liner and a rear paper which are adhered to each other by an adhesive, in which any one of the front paper 10 and the rear paper is made of pulp as a main component, and fly ash resulted from coal combustion is mixed with the pulp. According to another aspect of the present invention, there is provided a corrugated board box including a front paper, a corrugated liner and a rear paper which are adhered to each other by an adhesive, in which any one of the front paper 15 and the rear paper is coated with a coating solution consisting of fly ash resulted from coal combustion and an adhesive. According to another aspect of the present invention, there is provided a method of manufacturing an improved base paper for a corrugated board box, comprising a step of adding fly ash resulted from coal combustion to the base paper. 20 The fly ash adding step includes a first coating forming step of applying latex and pa2raffin on both surfaces of the base paper; a second coating forming step of applying a mixture comprising the fly ash on any one of both surfaces of the first coating; and a drying step of drying the base paper with the coating using a hot plate and a rolling iron at temperature of 200 C to 300 C. 25 6 WO 2009/017359 PCT/KR2008/004435 Advantageous Effects With the above description, the present invention has following advantages. In the case where a fruit hanging on a tree is wrapped by a wrapping paper according to the present invention, the fruit is sterilized by interrupting a part of solar 5 heat and sunlight which excessively arrives to the surface of the fruit, and radiating far-infrared using indirect heat of the solar heat arriving to the surface of the wrapping paper. Also, the present invention can accelerate the early growth of fruits by interrupting a part of solar heat and sunlight and increase a sugar content of the fruits 10 by radiating far-infrared from the fly ash. If the fruit is wrapped with the wrapping paper of the present invention, it is possible to prevent the fruit from being damaged by birds, insects or the like. In the case where vegetables or fruits are kept in a corrugated board box manufactured by using the packing paper of the present invention, the freshness 15 thereof can be maintained for a long time by the far-infrared radiated from the fly ash, as well as the increased sterilizing effect and the suppressed moisture absorption. Also, it is possible to prevent invasion of a mouse through a hole dug by the mouse. The surface of the base paper is coated with the mixture of the fly ash and starch or latex to remarkably reduce the warp. If the fly ash is added and the heat is 20 again applied to the fly ash, small grains of the fly ash absorb the moisture unevenly distributed in the base paper to solve uneven distribution of the moisture which is a cause of the warp. Also, the base paper is coated by the fly ash to improve the smoothness on the surface of the base paper and increase the adhesiveness among the corrugated liner, the rear paper, the front paper and the center paper, as well as 25 reducing the warp. 7 WO 2009/017359 PCT/KR2008/004435 Also, the base paper is added by the fly ash to increase strength (i.e., bursting strength, compressive strength and tensile strength) of the base paper due to the moisture absorption of the fly ash. The weight of the base paper is increased by adding the fly ash and starch to the base paper, thereby manufacturing the base 5 paper of good quality. In particular, in case of a conventional K base paper (1m * 1 m) used in a paper case, the weight of the base paper is 180g, but 150g of the base paper is used in the present invention, so that the pulp or recycled base paper of about 20% can be reduced. By mixing the fly ash with the base paper containing tangerine peels, acidity 10 of the tangerine peels is neutralized by an alkali component of the fly ash. Brief Description of the Drawings The foregoing and other objects, features and advantages of the present invention will become more apparent from the following detailed description when 15 taken in conjunction with the accompanying drawings in which: FIG. 1 is a perspective view illustrating an appearance of a corrugated board box applied to the present invention; FIG. 2 is a perspective view illustrating a major portion of the corrugated board in FIG. 1; 20 FIG. 3 is a view illustrating a fruiting tree with an immature fruit wrapped by a wrapping paper according to the present invention; FIG. 4 is a cross-sectional view of an improved base paper coated with a composite coating of a mixture containing fly ash; FIG. 5 is a view illustrating a corrugated board made of an improved base 25 paper according to the present invention, the corrugated board comprising a front 8 WO 2009/017359 PCT/KR2008/004435 paper, a rear paper and a corrugated liner; and FIG. 6 is a view illustrating a corrugated board made of an improved base paper according to the present invention, the corrugated board comprising a front paper, a rear paper, a corrugated liner and an intermediate paper. 5 Best Mode Reference will now be made in detail to the preferred embodiments of the present invention. It is to be understood that the following examples are illustrative only and the present invention is not limited thereto. 10 FIG. 1 is a perspective view illustrating an appearance of a corrugated board box applied to the present invention, and FIG. 2 is a perspective view illustrating a major portion of the corrugated board in FIG. 1. A packing paper comprising pulp as a major component comprises fly ash resulted from fuel combustion in a thermo power station, with the fly ash being mixed 15 with the pulp (first embodiment). At least one surface of a packing paper is coated with a coating solution consisting of fly ash resulted from coal combustion and an adhesive (second embodiment). Preferably, the adhesive comprises starch. 20 As shown in FIG. 1, the present invention can be applied to a packing case 20 manufactured by using the packing paper shown in the first and second embodiments (third embodiment). More specifically, a paper packing case 20 formed in a box shape and including a cover 21 for closing an opening portion comprises a receptacle for 25 accommodating contents therein, as shown in FIG. 1, an inner surface of the 9 WO 2009/017359 PCT/KR2008/004435 receptacle being coated with a coating solution consisting of fly ash resulted from coal combustion and an adhesive (fourth embodiment). The paper packing case 20 means a conventional packing case or case made of a paper, and can be applied to a packing case made of a corrugated board 5 which is made of a front paper, a corrugated liner and a rear paper which are adhered to each other by an adhesive, as shown in FIG. 2. More specifically, any one of a front paper 7 and a rear paper 1 is made of pulp as a main component, and fly ash resulted from coal combustion is mixed with the pulp (fifth embodiment). 10 A packing case made of a corrugated board which is made of a front paper 7, a corrugated liner 6 and a rear paper 1 which are adhered to each other by an adhesive, any one of the front paper 7 and the rear paper 1 being coated with a coating solution consisting of fly ash resulted from coal combustion and an adhesive (sixth embodiment). 15 As shown in FIG. 2, a rear paper 1 which forms a receptacle for accommodating contents therein is provided with a plurality of pores 22, and a coating solution passes through the pores 22 to fill a space between the rear paper 1 and a corrugated liner 6 (seventh embodiment). An adhesive for adhering a front paper 7, a corrugated liner 6 and a rear 20 paper 1 is mixed with fly ash resulted from coal combustion (eighth embodiment). A corrugated liner 6 is made of two-fold corrugated liners 61 and 62 which are adhered to each other by an adhesive 63, the adhesive 63 being mixed with fly ash resulted from coal combustion (ninth embodiment). Preferably, the adhesives of the fourth to ninth embodiments utilize starch. 25 In these embodiments, the fly ash is a waste material resulted from coal 10 WO 2009/017359 PCT/KR2008/004435 combustion, and has a fine grain size. The fly ash may be used as expensive bentonite which is used in a paper manufacturing process. Since it has effects of increasing strength of the box and irradiating far-infrared, the flay ash has advantages of lowering costs to manufacture a paper or corrugated board and 5 irradiating the far-infrared. The packing paper according to the present invention comprises the pulp as a major component, and is made by mixing the pulp and the fly ash in the paper making process. The process of manufacturing the packing paper using the pulp will now be 10 described. A common process of manufacturing a paper includes diluting pulp with water and then mixing it with starch which serves to increase strength of a paper, a sizing agent which serves to prevent absorption of moisture, such as pine resin, a retention agent which serves to reinforce the strength, expensive bentonite, and a deaeration 15 agent which serves to eliminate bubbles. According to the embodiment of the present invention, the expensive bentonite (crushed rock) used in the conventional process is substituted by the flay ash resulted from fuel combustion. The fly ash is a waste material produced when coal is burned to generate electric power, and has a fine grain size. The fly ash is 20 used as the expensive bentonite. Since it has effects of increasing strength of the box and irradiating far-infrared, the flay ash has advantages of lowering costs to manufacture a paper or corrugated board and irradiating the far-infrared. Consequently, the present invention provides a packing/wrapping paper consisting of the pulp and the fly ash. 25 The fly ash resulted from coal combustion does not impose a heavy burden 11 WO 2009/017359 PCT/KR2008/004435 on manufacturing costs of the paper to increase the hardness and strength of the paper. In particular, the fly ash is powder very smaller than crushed rock, and is usefully mixed with starch or a coating adhesive. As shown in FIG. 3, in the case where a fruit hanging on a tree is wrapped by 5 a wrapping paper 40 according to the present invention, the fruit is sterilized by interrupting a part of solar heat and sunlight which excessively arrives to the surface of the fruit, and radiating far-infrared using indirect heat of the solar heat arriving to the surface of the wrapping paper. Also, the present invention can accelerate the early growth of fruits by 10 interrupting a part of solar heat and sunlight and increase a sugar content of the fruits by radiating far-infrared from the fly ash. If the fruit is wrapped with the wrapping paper 40 of the present invention, as shown in FIG. 3, it is possible to prevent the fruit from being damaged by birds, insects or the like. 15 In the case where vegetables or fruits are kept in a corrugated board box manufactured by using the packing paper of the present invention, the freshness thereof can be maintained for a long time by the far-infrared radiated from the fly ash, as well as the increased sterilizing effect and the suppressed moisture absorption. If the fly ash is added in various agricultural boxes, it is possible to prevent invasion of 20 a mouse through a hole dug by the mouse. Also, it can increase the freshness of meat and fish and maintain taste and quality thereof by using the wrapping/packing paper as a packing case for fish or meat products and frozen foods. The present invention provides a method of manufacturing an improved base 25 paper for a corrugated board box by mixing a base paper with fly ash resulted from 12 WO 2009/017359 PCT/KR2008/004435 coal combustion. A conventional process of manufacturing a corrugated board includes a raw material preparing step of preparing a raw material of paper by mixing pulp with chemicals in water, a paper making step of making and drying a paper using a paper 5 machine, a coating step of applying the paper with a coating solution, an ironing step of ironing the coated paper, and a cutting step of cutting a large paper spool in a proper size. A fly ash adding step is performed between the coating step and the ironing step. 10 The flay ash adding step includes a first coating forming step of applying latex and paraffin on both surfaces of the base paper, a second coating forming step of applying a mixture comprising the fly ash on any one of both surfaces of the first coating, and a drying step of drying the base paper with the coating using a hot plate and a rolling iron at temperature of 200 C to 300 C. 15 In this instance, the base paper is made by using pulp, waste papers (raw materials of recycled paper) or its mixture, and means a paper used to manufacture a corrugated board. The base paper may be manufactured by adding other components to the pulp or the waste papers, for example, tangerine peels. In this embodiment, the base paper means a paper manufactured by a paper 20 machine during the paper making step. Also, the base paper may be used to manufacture a corrugated board and a corrugated liner (e.g., a front paper, a rear paper, an intermediate paper or the like). The fly ash is a waste material generated when pulverized coal is burned in a thermo power station. When the fly ash is refined, the refined fly ash has a grain 25 size of 1 to 100 micrometers. The grain is formed in a spherical shape, and its color 13 WO 2009/017359 PCT/KR2008/004435 is gray. The flay ash has high moisture absorbency and good pozzolanic reaction related to a hydraulic property. Preferably, the fly ash having a mean grain size of 20 to 30 micrometers is utilized. Before the fly ash is applied, paraffin and latex are diluted and then applied to 5 the base paper in a very thin thickness. A coating containing the fly ash is applied on the base paper and then dried by using the hot plate and hot blast to molten the paraffin and the latex, thereby assisting close adhesion between fine fly ash and thus forming dense tissue. Also, the fly ash has high moisture absorbency to prevent the performance of the fly ash from being deteriorated when the paraffin and the latex 10 are applied. More specifically, the latex is a kind of rubber to improve adhesion of the fly ash and mutual adhering force between the fly ash and the base paper, as well as affecting on the improvement of its strength and the warp. The paraffin serves to block absorption of the moisture from air. 15 The composite coating of the mixture containing the fly ash may be applied on both surfaces of the first coating consisting of the paraffin and the latex, or may be applied on any one of the sides. FIG. 4 is a cross-sectional view of the improved base paper coated with the composite coating of the mixture containing fly ash. A first coating consisting of 20 paraffin and latex is applied on both surfaces of a base paper 13, and then a composite coating 12 containing fly ash is applied on one surface of the first coating. In the step of drying the base paper with the coatings by passing the base paper through a hot plate having temperature of 200*C to 3001C (together with hot blast) and ironing the base paper using a roller, a drying time is about 200 minute/m, 25 a passing length is about 5m, and a drying platform has temperature of about 2001C 14 WO 2009/017359 PCT/KR2008/004435 to 300 C. The drying and ironing process is to increase the strength of the base paper and improve the function of the fly ash (an effect of increased emission of basic ion). The step of applying the composite coating of the mixture containing the fly 5 ash includes primarily applying and drying a mixture consisting of fly ash 50 to 60 parts by weight and starch or latex of 40 to 50 parts by weight, and secondarily applying a mixture of fly ash of 70 to 80 parts by weight, starch or latex of 5 to 10 parts by weight, paraffin of 2 to 5 parts by weight, sodium hydroxide of 2 to 5 parts by weight, and hydrogen peroxide of 2 to 5 parts by weight. 10 The step of applying the composite coating of the mixture is performed by separately performing the primary applying step and the secondary applying step in order to improve the adhesion. More specifically, contents of the starch or latex which is an adhesive component in the primary applying step are higher than those of the starch or latex in the secondary applying step. The primary application plays a 15 role in blocking of moisture absorption and assists the secondary application. The secondary applying step has effects of increasing the weight of the paper and improving the warp. If the contents of the fly ash are 50 parts by weight or less in the primary applying step, the function of the fly ash is hardly obtained. If the contents of the fly 20 ash are 60 parts by weight or more, the adhesion is decreased, so that it is difficult to coat the fly ash. If the contents of the fly ash are 70 parts by weight or less in the secondary applying step, the function of the fly ash is hardly obtained. If the contents of the fly ash are 80 parts by weight or more, the inherent quality of the paper is remarkably 25 deteriorated. 15 WO 2009/017359 PCT/KR2008/004435 Preferably, the composite coating of the mixture containing the fly ash is applied to the base paper in a ratio of 25 to 35 grams to 1 square meter. If the mixture of 25 grams or less is applied, effects of reducing the warp and increasing the strength and weight of the paper are limited. If the mixture of 35 grams or more 5 is applied, the inherent quality of the paper is remarkably deteriorated. The step of applying the composite coating of the mixture containing the fly ash may be executed once more if an applying volume of the composite coating is increased. In this instance, the step is performed under the same conditions after the coating is dried by the hot plate and then is ironed by the roller. 10 The latex or starch is to increase the adhesion of the fly ash and the mutual adhesive force between the fly ash and the base paper. The paraffin is to block the absorption of the moisture from the air. The hydrogen peroxide is to easily dry the coating due to its volatility and to increase the lubrication of the coating. The corrugated liner is manufactured by using the base paper of the 15 corrugated board coated with the fly ash. FIG. 5 is a view illustrating the corrugated board made of the improved base paper according to the present invention, the corrugated board comprising a front paper, a rear paper and a corrugated liner. In FIG. 5, a circle denoted by 'A' is an enlarged cross-sectional view of the front paper, and a circle denoted by 'B' is an 20 enlarged cross-sectional view of the corrugated liner. FIG. 6 is a view illustrating the corrugated board made of the improved base paper according to the present invention, the corrugated board comprising a front paper, a rear paper, a corrugated liner and an intermediate paper. In Fig. 6, a circle denoted by 'C' is an enlarged cross-sectional view of the intermediate paper. 25 The base paper is converted into the corrugated liner by a corrugation 16 WO 2009/017359 PCT/KR2008/004435 forming process for forming corrugation of a constant size. Preferably, the corrugated liners 220 and 340 are made of the base paper, both surfaces of the base paper being coated with the composite coating of the mixture containing the fly ash. The circle 'B' shown in FIG. 5 is an enlarged cross-sectional view of the corrugated 5 liner, in which both surfaces of the base paper 221 are coated with a first coating 222 and a second coating 223. The base paper which is not subjected to the corrugation forming process is used as a liner (e.g., a front paper, a rear paper, a center paper or the like). It is preferable that only surfaces of the front papers 210 and 310 and the rear papers 10 230 and 330 which are in contact with the corrugated liner are coated with the composite coating of the mixture containing the fly ash. The circle 'A' shown in FIG. 5 is an enlarged cross-sectional view of the front paper, in which both surfaces of the base paper 211 are coated with the first coating 212, and the surface contacting the corrugated liner is coated with the second coating 213. Preferably, the center paper 15 340 is made of the base paper with the composite coating of the mixture formed on both surfaces thereof, the mixture containing the fly ash. The circle 'C' shown in FIG. 6 is an enlarged cross-sectional view of the intermediate paper, in which both surfaces of the base paper 341 are coated with the first coating 342 and the second coating 343. 20 The corrugated liner and the liner are adhered to each other by an adhesive, and then the adhered board is cut to have a necessary dimension, thereby manufacturing the corrugated board. The corrugated board may be used to make a corrugated board box. Also, tangerine peels may be mixed with old corrugated boards to 25 manufacture the base paper, and then the base paper may be additionally treated by 17 WO 2009/017359 PCT/KR2008/004435 the fly ash to manufacture a corrugated board. The corrugated board may be used to make a corrugated board box. In this instance, since acidity of the tangerine peels is neutralized by an alkali component of the fly ash, the fly ash serves as a neutralizer. 5 The tangerine peel possesses strong acidity, while the refined fly ash possesses strong alkalinity. The dried tangerine peel powder and the refined fly ash powder are not reacted with each other, but neutralizing reaction between two materials is induced by the moisture contained in the air with the lapse of time. The base papers added with the fly ash and the corrugated boards 10 manufactured by the base paper will now be compared in terms of its quality. 1. Measurements of warp (Comparative Embodiment) A corrugated board was made of a front paper sk180, a b-corrugated liner 15 k180, a rear paper k180, and an s/w b-corrugated board by using a bhs corrugator. When moisture was measured on corners and a center portion thereof, there was a moisture difference. A warp of about 1.5 cm occurred towards the front paper, and slight distortion occurred. (Embodiment) 20 A corrugated board was made of a front paper sk180, a b-corrugated liner k180 (coated with fly ash), and a rear paper k150 (coated with fly ash) by using the same corrugator. When moisture was measured on corners and a center portion thereof, moisture was evenly distributed. A warp of about 0.3 cm occurred towards the front paper, and there was no distortion. Consequently, it meets the requirement 25 of the warp (although there are slight differences depending upon printing and 18 WO 2009/017359 PCT/KR2008/004435 Thomson machines, the requirement generally is 0.7 cm). 2. Measurements of base paper's weight As can be known from Table 1 below, when a corrugated board has a size of 5 1m * 1m, the weight of a base paper with the fly ash is increased 31% as heavy as that of a base paper with no fly ash. Therefore, it is noted that the weight of the corrugated paper is increased. It is shown that in the case where the fly ash of industrial waste is utilized, the expensive pulp can be substituted by about 30%. 10 [Table 1] (Comparison of weights before and after fly ash coating is formed) Paper Use of base paper Weight Remarks Coating Rate Before After Before After (lmxlm) (1mx1m) Front 150g 180g Single 1 150g 180g Liner 120g 180g Double 1.6 192g 288g Rear 150g 180g Single 1 150g 180g 31% Sum 492g 648g increased 15 3. Measurements of base paper's strength (before a corrugated board is formed) (Comparative Embodiment) 19 WO 2009/017359 PCT/KR2008/004435 In case of a base paper k180g, bursting strength was 3.8 Kfg/cm 2 , and compressive strength was 21.8kgf. (Embodiment) In case of a base paper k150 coated with fly ash mixture of 30g, bursting 5 strength was 4.0 Kfg/cm 2 , and compressive strength was 23.5kgf. 4. Measurements of base paper's strength (After a corrugated board is formed) (Comparative Embodiment) 10 As a result of measuring three kinds of ks double-side corrugated boards (comprising a front paper ski 80, a b-corrugated liner k1 80, a center paper k1 80, a b corrugated liner k180, and a rear paper k180), bursting strength was 1373 (14.0) kPa (Kgf/cm 2 ) or more, and vertical compressive strength was 6.39 (32.6) kN/m (Kgf/50mm). 15 (Embodiment) As a result of measuring a double-side corrugated board (comprising a front paper sk180, a b-corrugated liner k150 with a coating, a center paper k150 with a coating, a a-corrugated liner k150 with a coating, and a rear paper k150 with a coating), bursting strength was 1452 (14.5) kPa (Kgf/cm 2 ) or more, and vertical 20 compressive strength was 7.35 (34.5) kN/m (Kgf/50mm). Therefore, it is noted that the strength of the corrugated paper is increased by about 20%. Table 2 shows the improved quality of the corrugated paper before and after the fly ash coating is formed. 25 [Table 2] 20 Measured General base paper Base paper with fly ash Extent of improved items (Comparative Embodiment) coating (Embodiment) quality Warp Uneven moisture distribution Even moisture distribution Moisture distribution is Warp: 1.5cm Warp: 1.5cm even, and warp is Distortion occurred No distortion improved by 1.2cm. Distortion does not occur. Weight 492g/Im 648g/lm In case of using the same volume of pulp, weight is increased by about 31%. Strength Bursting strength: Bursting strength: Bursting strength and (before) 3.8 (Kgf/cm 2 ) 4.0(Kgf/cm 2 ) compressive strength are Compressive strength: Compressive strength: increased. 2l.8Kgf 23.5Kgf Strength Bursting strength: Bursting strength: After the corrugated board (after) 1373(14.0)kPa(Kgf/cm 2 ) or 1452(14.5)kPa(Kgf/cm 2 ) or is formed, bursting more Vertical more Vertical strength and compressive compressive strength: compressive strength: strength are increased by 6.39(32.6)kN/m 7.35(34.5)kN/m about 20%. (Kgf/50mm) (Kgf/50mm) A detailed description of one or more preferred embodiments of the invention is provided above along with accompanying figures that illustrate by way of example the principles of the invention. While the invention is described in connection with such embodiments, it should be understood that the invention is not limited to any embodiment. On the contrary, the scope of the invention is limited only by the appended claims and the invention encompasses numerous alternatives, modifications, and equivalents. For the purpose of example, numerous specific details are set forth in the description above in order to provide a thorough understanding of the present invention. The present invention may be practiced according to the claims without some or all of these specific details. For the purpose of clarity, technical material that is known in the technical fields related to the invention has not been described in detail so that the present invention is not unnecessarily obscured. 21 Throughout this specification and the claims that follow unless the context requires otherwise, the words 'comprise' and 'include' and variations such as 'comprising' and 'including' will be understood to imply the inclusion of a stated integer or group of integers but not the exclusion of any other integer or group of integers. The reference to any prior art in this specification is not, and should not be taken as, an acknowledgment or any form of suggestion that such prior art forms part of the common general knowledge of the technical field. 21a

Claims

1. A wrapping/packing paper including at least one surface thereof coated with a coating solution consisting of fly ash resulted from coal combustion and an adhesive. 5

2. The wrapping/packing paper as claimed in claim 1, wherein the adhesive includes starch.

3. A packing case manufactured by using a wrapping/packing paper according to claim I or 2. 0

4. A paper packing case including a receptacle for accommodating contents therein, an inner surface of the receptacle being coated with a coating solution consisting of fly ash resulted from coal combustion and an adhesive.

5. A corrugated board box including a front paper, a corrugated liner and a rear paper which are 5 adhered to each other by an adhesive, in which any one of the front paper and the rear paper is coated with a coating solution consisting of fly ash resulted from coal combustion and an adhesive.

6. The corrugated board box as claimed in claim 5, wherein the rear paper forming a receptacle for accommodating contents therein is provided with a plurality of pores, and a coating solution passes .0 through the pores.

7. The corrugated board box as claimed in claim 5, wherein an adhesive for adhering the front paper, the corrugated liner and the rear paper is mixed with fly ash resulted from coal combustion. !5

8. The corrugated board box as claimed in claim 5, wherein the corrugated liner is made of two-fold corrugated liners which are adhered to each other by an adhesive, the adhesive being mixed with fly ash resulted from coal combustion.

9. A method of manufacturing an improved base paper for a corrugated board box, including a step 30 of: adding fly ash resulted from coal combustion to the base paper; the fly ash adding step including: a first coating forming step of applying latex and pa2raffin on both surfaces of the base paper; a second coating forming step of applying a mixture including the fly ash on any one of both 35 surfaces of the first coating; and a drying step of drying the base paper with the coating using a hot plate and a rolling iron at temperature of 200 0 C to 300 0 C. 22

10. The method as claimed in claim 9, wherein the fly ash is a refined fly ash having a mean grain size of 20 to 30 micrometers.

11. The method as claimed in claim 9, wherein the step of applying the composite coating of the 5 mixture containing the fly ash includes primarily applying and drying a mixture consisting of fly ash 50 to 60 parts by weight and starch or latex of 40 to 50 parts by weight, and secondarily applying a mixture of fly ash of 70 to 80 parts by weight, starch or latex of 5 to 10 parts by weight, paraffin of 2 to 5 parts by weight, sodium hydroxide of 2 to 5 parts by weight, and 0 hydrogen peroxide of 2 to 5 parts by weight.

12. The method as claimed in claim 9, wherein the step of applying the composite coating of the mixture containing the fly ash is executed once more, after the coating is dried by the hot plate and then is ironed by the roller. 5

13. The method as claimed in any one of claims 9 to 12, wherein the base paper is mixed with tangerine peel extracts.

14. A wrapping/packing paper substantially as herein described with reference to any one of the 0 embodiments of the invention illustrated in the accompanying drawings.

15. A paper packing case substantially as herein described with reference to any one of the embodiments of the invention illustrated in the accompanying drawings. .5

16. A corrugated board box substantially as herein described with reference to any one of the embodiments of the invention illustrated in the accompanying drawings.

17. A method substantially as herein described with reference to any one of the embodiments of the invention illustrated in the accompanying drawings. 30 23