KR20000014976A - Removing method for cohesive impurities of corrugated cardboard old paper and rating method thereof - Google Patents

Abstract

PURPOSE: A removing method of adhesive impurities through a rising floating process, and a new rating method to measure the content of adhesive impurities of a macro and a micro sizes contained in a corrugated cardboard old paper. CONSTITUTION: The measuring method comprises: a removing process for adhesive impurities of a corrugated cardboard old paper rising and floating in the state of the 0.5 ¯ 2.0% concentration of the corrugated cardboard old paper, of the temperature of 20¯ 55°C, the speed of current of 10 ¯ 50 l/min, and the air flux of 5 ¯ 20 l/min; a measuring process of adhesive impurities of a macro size of the corrugated cardboard to measure the weight of the floated adhesive impurities of the macro size; a measuring process of adhesive impurities to measure the change of the produced paper intensity and the change of the white rate of a lower wire belt.

Description

Removal method of sticky foreign substances on corrugated cardboard and its quantification method

The present invention relates to a method for quantifying and removing adhesive foreign matters from corrugated cardboard, and more particularly, to a method of removing adhesive foreign matters through floating flotation and macro- and micro-sized adhesive foreign matters contained in corrugated cardboard. It relates to a new quantitative method of measuring content.

As of 1997, the total tributary production in our country reached 836 million tons, making it the 10th largest in the world. In particular, cardboard production, which is at the core of product packaging, accounts for more than 30% of the total paper production. On the other hand, the corrugated cardboard is mainly manufactured by using the domestic corrugated cardboard as the main raw material, and thus the domestic corrugated cardboard is recycled through a high recycling system. However, as the recycle rate of the corrugated cardboard is high, the quality of the recycled pulp has a problem that is sharply lowered.

The domestic corrugated cardboard is a low-grade mixed paper containing printed matters such as newspapers and magazines and various writing papers in addition to the corrugated cardboard, and various kinds of foreign substances are included in the paper. Copy toner contained in paper, latex as an adhesive for pigment coating, hot-melt resins used to seal cardboard boxes and booklets, and pressure sensitive adhesives contained in various tapes. sensitive adhesives, etc., form stickies when they remain in the papermaking system.

On the other hand, the sticky foreign matter causes a papermaking failure, which is a factor to reduce the productivity, not only damage the various physical properties and processing aptitude of the final paper product, but also has been a cause of deteriorating the product value in appearance. Moreover, as each producer of corrugated cardboard paper continues to reduce the discharge of wastewater while strongly promoting the closure and non-discharge of process water for the purpose of environmental preservation and water saving, the accumulation of adhesive foreign matter in the process water The situation is deepening. Therefore, in the production of corrugated cardboard, which is mainly made of highland, problems such as paper cutting and contamination of irritated equipment due to sticky foreign materials are expected to intensify.

In addition, as the speed of papermaking equipment becomes faster and wider, the downtime caused by paper cuts is expected to have a more severe impact on production efficiency.Therefore, there is an urgent need for the development of new treatment technologies to remove sticky foreign substances. It is becoming. For example, US corrugated cardboard companies reported losses of $ 165 million annually as productivity declined due to sticky foreign material downtime [Progress in Paper Recycling, 6, 11, 70 (1996). )].

On the other hand, in order to overcome the problems caused by the adhesive foreign matters first to establish a quantitative method of adhesive foreign matters, which must be established first, the quantitative method for the adhesive foreign matters to measure the amount of foreign substances contained in the raw material notice, and to control them This is because more effective measures can be taken by analyzing the effects of various treatment processes performed for the purpose.

The research on the method of quantifying sticky foreign matter has been mainly conducted in paper makers, paper additive manufacturers, and paper equipment manufacturers. The following basic measurement principles are established to establish more accurate and reproducible quantitative methods. Based on this, various studies are being conducted.

First, there is a quantitative method based on the presence of undissociated powder that is not easily dissociated, which is one of the characteristics of the paper containing the adhesive foreign matter. In the quantitative method, there is a visual method of measuring the amount of sticky foreign matter by visually observing debris or a clump of fibers formed by sticking foreign matters interfering with the fibers of the fiber.

In addition, as a quantitative method improved from the above-mentioned simple method, a method of screening a stock and separating a screen reject, and then measuring the amount directly, using the fact that the undissociated powder does not pass through the slots of various screens This was developed. As another method, the screen reject was dehydrated to form a pad, and then a hot-pressing process was used to bond foreign matters and image analysis to measure the area and number of sticky foreign matters.

However, since the quantitative method for measuring the tacky foreign matter based on the undissociated powder is not an actual tacky foreign matter, it is an indirect method for measuring the fiber bundle formed by the tacky foreign matter or measuring its weight and area. [Contaminant Problems Seminar, 161 (1992)], even if the image of the screen rejects transferred by thermocompression treatment is attached to the surface of the sticky foreign matter, As a result, errors in area measurement and measurement errors due to the shape of the foreign matter itself could not be avoided.

Another principle of measurement is that the sticky foreign matter exhibits adsorption characteristics to the countertop in addition to the formation of undissociated powder. As an example of a quantitative method using the adsorptive property of the adhesive foreign matter, a polyethylene sheet [Forming Sheet] or a forming fabric [Forming Fabric] is immersed in a certain concentration of paper containing the adhesive foreign matter and stirred, and then the weight of the adhering foreign matter is measured. Or measuring the area and number by image analysis. The above-mentioned adsorption method is used for the measurement of micro stickies of micro units smaller in size than the above-described non-dissociated matter measuring method, and these micro-sized sticky foreign substances exist in the white water in a stable colloidal state, such as pH, temperature, moisture, etc. It has been reported to cause problems by aggregation and adsorption due to changes and electrostatic neutralization by various polymer electrolytes [Adhesives in recycling, 41 (1996); 3rd Research Forum on Recycling, 187 (1996). However, in the manufacturing process of the corrugated paper base to be dealt with by the present invention, unlike the regeneration treatment of printing paper containing alkali deinking process, the sudden change of pH, temperature and electrostatic charge does not occur, so that the quantitative determination of sticky foreign matter using the adsorption method This is inappropriate.

On the other hand, the micro-sized sticky foreign matter, which is a problem when recycling the corrugated cardboard, is characterized by cohesion by evaporation of moisture in the marsh peel, and especially high temperature compression using a condition belt that is being actively studied for improving physical properties of corrugated cardboard. There is a concern that the drying treatment causes clogging of the lower belt.

The high temperature compression drying technique combines two processes, one of compression and drying, to promote the bonding between fibers. When the wet sheet is pressed and dried under the heating conditions above the glass transition point of the pulp fibers, the flexibility of the fibers increases, so that the bonding strength between fibers is increased. Can be greatly increased, and as a result, the strength of the paper can be improved to a level that cannot be obtained by conventional techniques. In the case of using the high-temperature compression drying technology, in particular, the compressive strength and the rupture strength in the width direction are improved by about 50%, the interlayer bond strength is increased by 20 to 300%, and the density and smoothness are increased by 25 to 100%, respectively. It is estimated that there is. However, as described above, if the micro-sized sticky foreign matter, which is a problem when recycling the corrugated cardboard, prevents the lower belt during the high temperature compression drying process, the effect of the conditional treatment may not be sufficiently achieved.

As mentioned above, although various studies on sticky foreign matters have been conducted, quantitative methods that can oversee the existing research results have not been established until now. In addition, the degree of adverse effects caused by each sticky foreign matter with different pollutants in each process shows a significant difference depending on the species. Moreover, it is difficult to establish a unified quantitative method for cohesive foreign substances because cohesive foreign substances originating from the same pollutant have different effects on the process even among companies producing the same paper.

Therefore, the method of quantifying sticky foreign matter should be developed to be suitable for each producer in consideration of the entire grassland environment such as paper type, production facilities, and water. Especially, in the case of corrugated cardboard recycling companies, where the research on sticky foreign matter has been relatively insufficient, In order to cope with the sudden change of the papermaking environment, it is urgent to establish a method for quantifying and removing adhesive foreign substances.

On the other hand, the conventional technology to remove the adhesive foreign matter is to use a selection facility such as a cleaner or a screen to treat the foreign matter of the macro size and the method to disperse or remove after the coagulation treatment to prevent the micro-sized foreign matter to act as the adhesive foreign matter Etc.

Looking at the pressure screen as an example of a facility that has been applied to select the macro-sized sticky foreign matter as follows. At present, the narrowest screen basket has a slot width of 100 to 200 μm, and the removal of sticky foreign matters by screening is based on the principle that larger size sticky foreign matters are filtered out by screening. However, in this case, the flexible adhesive foreign matter passes through the slot and enters the process, which may cause various problems. In addition, the adhesive tacky foreign material that does not pass through the screen blocks the slot despite the extrusion action of the foil. There was a problem of deterioration.

Dissolved Air Flotation (DAF) treatment, which has been mainly used to remove micro-sized sticky foreign matters, first removes the sticky foreign matters contained in the white water of papermaking process. It is neutralized with a method, followed by a flotation treatment to remove the suspended tacky foreign matter. However, the following problems may occur in removing micro-sized sticky foreign substances by applying DAF treatment. First of all, since the recycling process of corrugated cardboard does not include the degreasing process under alkaline conditions, there is a difference that the electrostatically charged sticky foreign matter is less than that of other printing papers. If the DAF treatment is improperly applied, In view of the fact that white water in corrugated cardboard production process has recently been closed for water conservation and environmental preservation, the efficacy of various polymer additives decreases gradually, and the chemical and biological oxygen demands of process water increase due to accumulated additives. May be induced.

Therefore, as a conventional corrugated cardboard manufacturing technology, as long as the low-grade corrugated cardboard is used as the main raw material, the contamination of the irritant tool caused by sticky foreign matters during the papermaking of the corrugated cardboard, the productivity decrease due to the paper, and the various physical properties of the final paper product, Deterioration of workability is unavoidable, and in particular, the high temperature compression drying treatment that significantly improves the strength and surface smoothness of the corrugated cardboard base cannot be effectively applied. Therefore, the development of a new environmentally friendly foreign material removal technology that has escaped the use of conventional chemical additives and quantification method of the adhesive foreign matter suitable for the raw material system and the papermaking environment in the production of domestic corrugated cardboard paper is urgently needed more than ever.

The inventors of the present invention have made diligent research efforts to solve the above problems, and when the floating flotation process is applied as a method of removing the tacky foreign matter suitable for the raw material system and the papermaking environment of the current corrugated cardboard, the tacky foreign matter is effectively removed. The present invention has been completed by developing a quantitative method for measuring macro-sized sticky foreign substances and micro-sized sticky foreign substances, respectively, removed by the process.

Therefore, it is an object of the present invention to provide a method for removing sticky foreign matter from cardboard.

In addition, another object of the present invention is to provide a method for quantifying adhesive foreign matter of cardboard.

Figure 1a is a graph showing the tensile strength of the flotation treated floating paper,

Figure 1b is a graph showing the tensile strength of the floating paper untreated floating paper,

Figure 2 is a graph showing the whiteness reduction of the lower belt of the high temperature compression drying apparatus.

The present invention is characterized by a method for removing cohesive foreign matter from corrugated cardboard suspended in flotation under conditions of 0.5 to 2.0% corrugated cardboard, 20 to 55 ° C. temperature, 10 to 50 l / min flow rate and 5 to 20 l / min air flow conditions. .

In addition, the present invention is a corrugated cardboard paper, treated with 500 to 1,500% by weight of cellulase under 40 to 60 ℃ conditions, immersed in an aqueous sodium chloride solution with a specific gravity of 1.1 to 1.3, and then measured for the weight of the suspended macro-sized sticky foreign matter Macro size of the adhesive foreign matter quantification method is another feature.

On the other hand, the present invention is applied to the high-temperature compression drying apparatus equipped with the upper steel belt [steel belt] and the lower wire belt [steel belt] manufactured using the corrugated cardboard, the temperature of the steel belt and wire belt 150 to 190 ° C. and 60 to 90 ° C., respectively, press-dried for 5 to 10 seconds at 6 to 8 bar pressure for papermaking, and then the change in the whiteness and the produced paper strength of the lower wire belt were measured. Micro-sized adhesive foreign matter quantification method of the corrugated cardboard is another feature.

The present invention will be described in more detail as follows.

In the present invention, the flotation flotation treatment, which has been applied to the deinking of the printing paper, is introduced into the recycling processing of the cardboard paper to remove the sticky foreign matter. In other words, the specific gravity of the adhesive foreign matter resulting from the dissociation of the pressure-sensitive adhesive is lower than the fiber and the surface chemical property is more hydrophobic than the fiber. In addition, micro-sized sticky foreign matter is also removed with the fine powder as a reject powder.

Floating flotation treatment process to which the present invention is applied has been previously applied to the deinking treatment of printed matter, in the present invention has been used to remove the sticky foreign matter of the corrugated cardboard has a special feature. Floating flotation process in the deinking process is performed to separate ink particles having different surface and chemical properties from the paper, and to reduce flotation of wood fibers and desorption and bubble of ink particles. In order to promote the formation and stabilization of the surfactant, various degreaser of surfactants should be added, but the flotation treatment process for the corrugated cardboard notice according to the present invention is completely free of chemical additives under relatively low flow rate and air flow conditions than the deinking process. There is a fundamental difference from the deinking process in that it is carried out for the purpose of removing the tacky foreign matter having different specific gravity without adding, and it will be excellent in the present invention.

Floating flotation treatment process according to the present invention is preferably carried out under the conditions of 0.5 ~ 2.0% corrugated cardboard, 20 ~ 55 ℃ temperature, 10 ~ 50 l / min flow rate and 5 ~ 20 l / min air flow rate, If the flotation process is out of the above limit, there is a problem that the useful long fiber powder is removed together with the adhesive foreign matter.

On the other hand, since the conventional quantitative method was a method of quantifying by sticking or screen-treated adhesive foreign matter that does not dissociate, there was a disadvantage that the fiber adheres to the surface of the foreign matter causing measurement error, the quantitative method of macro-sized adhesive foreign matter of the present invention In order to compensate for this, the paper containing the foreign matter of macro size is treated with cellulase, which is an enzyme that decomposes only the fiber without reacting with the adhesive foreign matter at all, to decompose and detach the fiber attached to the foreign matter surface. The cellulase treatment is preferably carried out by adding 500-1,500% by weight of cellulase under the conditions of 40 to 60 ℃, the addition amount may be adjusted according to the amount of fibers attached to the tacky foreign matter.

By using the point that the specific gravity of the adhesive foreign matter surface is clean by the enzyme treatment than the fiber, the adhesive foreign matter and fibers are separated from the aqueous solution of sodium chloride of specific gravity 1.1 ~ 1.3 by the difference in specific gravity, and the total dry weight of the adhesive foreign matter is measured and the macro Quantify the amount of sticky foreign matter of size. Therefore, the macroscopic adhesive foreign matter quantification method of the present invention can rapidly obtain reproducible measurement results without the influence of fibers remaining on the foreign matter surface, unlike conventional quantitative methods.

In addition, the micro-sized sticky foreign matter quantification method of the present invention is a micro-sized foreign matter quantification method of corrugated cardboard which could not be effectively measured by a conventional quantitative method. As described above, the micro-sized sticky foreign matter in the corrugated cardboard is aggregated as the water content decreases to show adhesiveness, and thus prevents the flow of moisture by blocking the lower belt during the hot pressing drying process using the condition belt. As a result, the drying of the marsh peel becomes uneven, the standard deviation of paper strength increases and the average strength decreases.

In the present invention, by measuring the change in paper strength and the change in the whiteness of the lower belt due to the lower belt clogging of the adhesive foreign matter, to determine the micro-sized adhesive foreign matter. First, the wetland peel manufactured using the corrugated cardboard is applied to the high temperature compression drying apparatus equipped with the upper steel belt and the lower wire belt, but the temperature of the steel belt and the wire belt is 150 to 190 ° C and 60 to 90 ° C, respectively. And press-dry for 5 to 10 seconds at a pressure of 6 to 8 bar to make paper. The temperature of the steel belt and the wire belt is a condition for the drying of the marsh pill enough, if the outside of the limited range, the paper properties such as strength is changed as the wet fill of the basis weight 150g / m ² is not sufficiently dried Can be. In addition, when the pressure is less than 6 bar, it is difficult to sufficiently obtain the effect of improving the strength of the high-temperature compression drying treatment, and when it exceeds 8 bar, there is a risk of excessive belt marks on the back of the paper. Following the papermaking process, the micro-sized adhesive foreign matter is quantified by measuring the change in the whiteness of the lower wire belt and the paper strength change produced by the micro-sized adhesive foreign matter.

The present invention is preferably applied to the adhesive foreign matter removal method and quantification method of the low-grade mixed corrugated cardboard recycling process, and thus it is possible to control the adhesive foreign matter that is a problem when reproducing domestic cardboard, thereby producing a corrugated cardboard It can improve the efficiency and greatly improve the quality of the cardboard, such as the strength properties and appearance.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited by the Examples.

Example 1

A paper tape containing 2.0 g of pressure-sensitive adhesive was artificially attached to a corrugated paper sheet to form a paper containing sticky foreign matter, and then forcedly accelerated to aging for 1 hour in a dryer at a temperature of 105 ° C. so as to resemble a paper that had passed through an actual shelf life. Subsequently, the aged low paper laboratory low concentration pulper [Low Consistency Pulper; Daeil Engineering, Korea] was dissociated for 1 hour under the conditions of pH 7.0 ~ 8.0, temperature 55 ℃. The diluted stock with fresh water at a temperature of 45 ° C. was then subjected to an E-type flotation oil [Voith, Germany] using a concentration of 1%, a temperature of 45 ° C., a flow rate of 30 L / min and an air flow rate of 15 L / min. As a condition, the macro and micro sized sticky foreign substances were removed with 17% rejection by flotation treatment for 2 minutes.

In order to measure the amount of sticky foreign matter contained in the accept powder and reject powder of the flotation treatment, the following quantitative method was performed. First, each stock was collected by 1g on a dry weight basis and dehydrated 15% or more using a 150 mesh sieve. Subsequently, the dehydration material was immersed in 25 ml of a stock solution of cellulase and hemicellase complex enzyme (Genenco, Finland, Pergalase FL-60) isolated and purified from Trichoderma longibrachiatum, and stirred at a temperature of 45 ° C. Aging treatment was performed for 24 hours in a thermostatic water bath to decompose and detach the fibers attached to the macro-sized foreign matter surface. Then, the hydrolyzed stock was dehydrated again by the enzyme, and then transferred to 500 ml of an aqueous sodium chloride solution having a specific gravity of 1.12, and left for 1 hour. At this time, the adhesive particles and fibers contained in the paper were classified according to the difference in specific gravity, the fibers precipitated while the adhesive particles were suspended, and the dried macroscopic adhesive substance was taken and dried, and then the total dry weight was measured. The results are shown in Table 1 below.

Comparative Example 1

Except that the flotation treatment was not performed in Example 1, the same process was performed, and the results are shown in Table 1 below.

division Example 1 Comparative Example 1 Injury Floating Acceptance Floating Reject Dry pulp weight (g) 83 17 100 Adhesive foreign substance content (g) 0.72 1.28 1.98

As can be seen from Table 1, when comparing the content of the adhesive foreign matter of Comparative Example 1 and the foreign matter content of the floating flotation accepting powder and reject powder shown in Example 1, it was almost consistent with 1.98 g and 2.00 g, respectively, The value was also in agreement with the 2.00 g of the amount of the pressure-sensitive adhesive adhered to the initial sample in Example 1 and Comparative Example 1 bar, it was confirmed that the accuracy of the adhesive foreign matter quantification method of the macro size of the present invention is very excellent.

In addition, as shown in Table 1, the flotation treatment for domestic cardboard notices had an effect of removing more than 64% of the adhesive foreign matter. In addition, although the reject fraction of the flotation flotation was less than 17% of the total stock, such a small amount of the reject fraction contained the viscous foreign matter more than eight times more concentrated than the accent fraction. It was confirmed that it can be effectively removed.

Example 2

After collecting the backing material of the liner paper from the headbox of the corrugated paper production site, using an E-type flotation machine [Voith, Germany], the concentration is 1%, the temperature is 45 ℃, the flow rate is 30 ℓ / min and the air flow rate. Floating flotation was carried out for 2 minutes at 15 L / min to remove micro-sized sticky foreign matter with 17% rejection. On the other hand, there were less than 1% of the macro-sized sticky foreign matter that can not pass through the 150 ㎛ wide slot.

The floating floating acceptor powder is 25 × 25 cm 2 square sheet weeder [Handsheet Former; Daeilgi Corporation, South Korea] using a basis weight of 150 g / ㎡, and the wetland peeled paper sheet press [Press; Daeilki Engineering, South Korea] was pressed for 3 minutes at a pressure of 4.5 kg / ㎠ to adjust the concentration to about 50%. After repeating this process to construct 10 sheets of wetland peel, using a laboratory static condebelt (static condebelt) in turn was subjected to a high temperature compression drying process. At this time, the temperature of the upper steel belt and the lower wire belt was 180 ℃ and 80 ℃, respectively, the process of drying for 7 seconds at a pressure of 7 bar was repeated for 10 times without washing the lower belt. Subsequently, the tensile strength of the paper was measured according to the Tappi standard method T-494 om-88 according to the order of papermaking, and the average value and standard of the tensile strength of the 14 specimens formed by cutting each paper sheet were measured. The deviation was calculated and shown in the accompanying Figure 1a. In this case, the amount of micro-adhesive foreign matters was relatively known based on the variation of the mean tensile strength and standard deviation of the sheet.

In addition, the whiteness of the lower belt surface used in the hot pressing drying process Hunter Whiteness Tester [Hunter Brightness Tester; Hunter Lab, USA], and the results are shown in FIG. Through the change of the whiteness of the belt, the degree of adsorption of the micro-sized sticky foreign matter on the belt was found, and the amount thereof was also relatively known.

Comparative Example 2

Except that the flotation treatment was not performed in Example 2, the same procedure was performed, and the average tensile strength value and standard deviation of the manufactured papermaking paper are shown in FIG. 1B, and the decrease rate of whiteness of the lower belt surface is shown in FIG. Shown in

As can be seen in the attached Figures 1a and 1b, in the case of the flotation material treated in Example 2, as shown in Figure 1a, the average or standard deviation of the tensile strength according to the order of the compressed paper compressed by the condition Although there was almost no change, it was found that the average tensile strength decreased by 13.7% or more and the standard deviation increased by 86.1% or more when the raw material of the flotation treatment of Comparative Example 2 was not used. In the case of Comparative Example 2 using the untreated flotation paper, the micro-sized sticky foreign matter in the corrugated cardboard was agglomerated according to the decrease of water, and the adhesiveness was shown. This is because the drying of the marsh fill became uneven while impeding the flow of water. Therefore, it was confirmed that the flotation treatment method of the present invention is an excellent method for removing micro-sized foreign matter. On the other hand, since the average value and the standard deviation change of the tensile strength is proportional to the amount of micro-adhesive foreign matter, the amount of the foreign matter of the micro-size is relatively comparable, so that the amount of foreign matter of the micro-size can be quantified through this. have.

In addition, looking at the attached Figure 2, because it was able to remove the foreign matter of the micro size by the flotation floating treatment for domestic corrugated cardboard notice that the lowering of the whiteness of the lower belt can be mitigated by 7.3%, the present invention floating treatment method We could reaffirm that it is an excellent method for removing micro-sized foreign objects. On the other hand, since the lowering degree of whiteness of the lower belt is proportional to the amount of micro-sized sticky foreign matter, the amount of foreign matter of the micro-size becomes relatively comparable, and thus the amount of foreign matter of the micro-sized can be quantified. .

As described and demonstrated in detail in the above, the present invention provides a method for removing adhesive foreign matter of cardboard and quantitative methods thereof.

The method of removing the tacky foreign matter due to the flotation of the present invention has the effect of efficiently removing the tacky foreign matter in the corrugated cardboard without adding any chemical additives to the corrugated cardboard, unlike the conventional dispersion or flocculation treatment. Unlike the separation method, there is an effect that can effectively remove the adhesive foreign matter without contaminating the selection equipment such as the screen.

In addition, the adhesive foreign matter quantification method of the corrugated cardboard of the present invention can measure the adhesive foreign matter content of the macro size without the influence of the fibers adsorbed on the foreign matter differently from the conventional quantitative method, and the micro-sized Able to quantify the adhesive foreign matter, there is an effect that can predict the degree of contamination of the high temperature compression drying apparatus.

Claims (3)

A method for removing cohesive foreign matter from corrugated cardboard, characterized by floating flotation at a concentration of 0.5 to 2.0% corrugated cardboard, at a temperature of 20 to 55 캜, at a flow rate of 10 to 50 l / min and at a flow rate of 5 to 20 l / min. The corrugated cardboard paper was treated with 500 to 1,500% by weight of cellulase under 40 to 60 ° C. conditions, immersed in an aqueous sodium chloride solution having a specific gravity of 1.1 to 1.3, and then weighed with a sticky foreign matter having a suspended macro size. Macro sized sticky foreign matter quantification method. The wetland peel manufactured using corrugated cardboard is applied to a high temperature compression drying apparatus equipped with an upper steel belt and a lower wire belt, and the temperature of the steel belt and the wire belt is 150 to 190 ° C, respectively. And 60 to 90 ° C., press-dried for 5 to 10 seconds at 6 to 8 bar pressure, and papermaking, and then measuring the change in whiteness and the produced paper strength of the lower wire belt. Method for quantifying sticky foreign matter of high micro size.