KR100962033B1 - Raw material manufacturing method for paper, paper board manufacturing method and paper board manufactured by above method - Google Patents

Abstract

The present invention relates to a manufacturing method of the raw material for papermaking, and a method for manufacturing a paperboard and a paperboard produced thereby, to obtain a raw material for papermaking by physically treating sawdust generated during processing wood processing to obtain an alternative raw material due to the lack of waste paper supply In addition, by mixing the substitute raw material with the deep-layer material to produce a cardboard, it is possible to improve the productivity, thickness and stiffness (Stiffness), thereby making it possible to manufacture a cardboard with excellent yield and quality at a low cost.

Cardboard, waste paper, sawdust, deep-layer

Description

Raw material manufacturing method for paper, cardboard manufacturing method and paperboard produced by the same {Raw material manufacturing method for paper, paper board manufacturing method and paper board manufactured by above method}

The present invention relates to a method of manufacturing a raw material for papermaking, a method for manufacturing a paperboard, and a paperboard produced thereby, and more particularly, to a technology for manufacturing paperboard by physically treating sawdust, which is a processed wood processing by-product.

In the conventional case, papermaking raw materials were obtained by pulping a wood chip in a wet state physically and chemically.

1 is a cross-sectional view of a cardboard. Typically, the cardboard 10 has a layered structure including a coating layer 11, a surface layer 12, a subsurface layer 13, a deep surface layer 14, a back layer 15. The core layer 14 of the configuration of the cardboard (10) occupies the most specific gravity, the largest impact on the productivity, thickness, etc. of the cardboard.

2 is a view illustrating a paperboard manufacturing process. As a raw material for the deep core layer that occupies the most part of the composition of the paperboard, waste paper such as old corrugated container (OCC) and old book is used. Dissociate the waste paper (S110). In this process, waste paper is dissociated into the core material and foreign materials such as vinyl, sand, adhesive, tape, ink particles, and various chemicals.

Then, various debris such as vinyl, sand, adhesive, tape, ink particles, etc. are removed through the selection process (S120), and wastewater is discharged through the concentration (S130) process to obtain a concentrated core layer material. Subsequently, the bottom layer under the core layer, the ground layer formation (S140) to form a surface layer and a subsurface layer thereon, compression dehydration (S150) for pressing and dehydrating the formed ground layer, drying (S160), drying the dehydrated ground layer, coating layer Through a post-treatment process such as coating (S170) to form a, flattening and smoothing the surface (S180), winding the manufactured cardboard (S190) process to produce a cardboard as shown in FIG.

Waste paper such as cardboard (OCC), old books, etc., which are used as a core layer in cardboard manufacturing, are reused at least 1 to 10 times in cardboard manufacturing. There is high altitude which affects productivity, and altitude adjustment is difficult.

In the conventional case, to improve this, the artificial water is quickly adjusted by using a drug such as a dehydration accelerator, but there are many side effects such as a cost increase due to the use of the drug, pollution of the paper machine due to the drug, and an increase in bubble generation.

In cardboard, the thickness characteristic is one of the most important quality characteristics. If the use of the cardboard is mainly thin box (Box), the stiffness (low stiffness) is low, the box is crushed problem occurs. Stiffness is affected by the thickness to the extent that it is proportional to the third square of the thickness under the same conditions.

In the conventional case, in order to improve the thickness of the cardboard, the pressure applied to the roll is lowered in the compression dehydration process, the calendering process, etc., but the thickness is increased. It also lowers productivity. In order to improve this, the use of high-grade raw materials, starch and other chemicals to increase the stiffness (Stiffness), but this also raises the cost and lowers the productivity. There are other easy ways to solve this problem by increasing the basis weight, but the cost will increase.

The present inventors have been able to increase the productivity of the cardboard in order to solve this problem, it has been studied for the technology to produce a cardboard excellent in rigidity of the cardboard.

The present invention has been invented under the above-mentioned purpose, and by manufacturing the raw material for the paper used as the raw material of the core surface layer of cardboard by physically treating the sawdust generated during processing wood processing for papermaking can obtain an alternative raw material due to the shortage of waste paper supply It is an object to provide a method for producing a raw material.

Yet another object of the present invention is to manufacture a cardboard by mixing the papermaking raw material obtained by physically treating the sawdust generated during processing wood to the deep-layer material to produce a cardboard, which can improve productivity, thickness and stiffness (stiffness) To provide.

Still another object of the present invention is to provide a paperboard having excellent quality by mixing papermaking raw material obtained by physically treating sawdust generated during processing wood processing with a deep-layer material.

According to an aspect of the present invention for achieving the above object, the method for manufacturing a raw material for papermaking according to the present invention by grinding the sawdust which is a processed wood processing by-product using a grinder to produce a wood fiber having a predetermined range of length, this Passing through the screen (Screen) is characterized in that the removal of foreign matter and wood fibers of a size larger than a predetermined range of length to obtain a raw material for papermaking.

According to another aspect of the present invention, the cardboard manufacturing method according to the present invention is characterized in that the cardboard is manufactured by mixing sawdust, which is a processed wood processing by-product, in the deep-dispersed raw material subjected to dissociation, selection, and concentration.

According to another aspect of the present invention, the cardboard according to the present invention is characterized by being manufactured by mixing sawdust, which is a by-product of wood processing, in deep-core material which has undergone dissociation, selection and concentration.

The present invention can obtain a raw material for papermaking by physically treating the sawdust generated during processing wood processing to obtain a raw material for papermaking, the raw material for papermaking obtained by physically treating the sawdust generated during processing wood processing By manufacturing the cardboard by mixing in the core material, it is possible to improve the productivity, thickness and stiffness (Stiffness), and has a useful effect of producing a cardboard with excellent yield and quality at a low cost.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily understand and reproduce the present invention.

3 is a flow chart showing an embodiment of a papermaking raw material manufacturing method according to the present invention. As shown in the figure, in order to manufacture the raw material for the paper used as the core layer of the paper, first, in step S210 the sawdust which is a processed wood processing by-product is pulverized using a grinder to produce a wood wood fiber having a predetermined range of length. .

In the case of Medium Density Fiberboard (MDF) and High Density Fiberboard (HDF), wood chips are dissociated with a defiberator to make wood fiber powder. Since it is processed, sawdust of, for example, 0.01 to 3 mm, which is finer than sawdust generated in general wood processing, is generated as a by-product. However, these by-products contained various foreign matters and were not used as raw materials for papermaking, but were mainly used as heating fuel and compost.

Fine sawdust is characterized by being easily crushed during processing. With this feature in mind, in step S210, the sawdust, which is a by-product of wood processing, is ground to a mean particle size of, for example, 80 to 500 μm using a mill (Cutter Mill, Pin Crush, Hammer Mill) to produce wood fibers. . At this time, in order to adjust the size of the wood fiber to the desired size, it is possible by varying the type, speed, wing shape and the like of the grinder.

Then, the wood fibers produced by the step S210 in step S220 is passed through a screen (Screen) to remove foreign matter and wood fibers of a size larger than a specific length to obtain a papermaking raw material.

The size of the wood fibers is determined by the number of meshes per unit area of the screen, and the smaller the number of meshes per unit area, the more efficient the wood fiber treatment is, but the larger the size of the wood fibers There is a disadvantage in that the formation and smoothness of the product are lowered, and the bond strength is weakened.

On the contrary, the larger the number of meshes per unit area, the lower the efficiency of wood fiber treatment, but the smaller the size of the wood fibers, the better the formation of the stratum and the smoothness of the product can be improved. Screen is required.

For example, when the wood fiber having an average particle size of, for example, about 80 to 500 μm is produced by the S210 step, the wood fiber is passed through a screen of 80 to 200 mesh in a step S220, and the foreign matter and a predetermined range. The length of, for example, wood fibers with a size larger than 80 to 500 μm is removed to obtain a papermaking material having a fine size.

Therefore, the raw material for papermaking used as part of the core layer can be obtained by physically treating sawdust without chemical treatment such as dissociation, selection and concentration, which can reduce power costs and reduce the sludge generated in wastewater and wastewater. It is possible to obtain, and by using the fine papermaking material obtained by the physical treatment as the core layer in the manufacture of cardboard as follows, it is possible to obtain an alternative raw material due to the lack of waste paper supply.

The cardboard manufacturing process in which the papermaking raw material manufactured by the method shown in FIG. 3 is used for the core surface layer of the cardboard will be described with reference to FIG. 4. 4 is a flowchart illustrating an embodiment of a cardboard manufacturing method according to the present invention.

First, in a step S310 of the dry state prepared by the method shown in FIG. 3 to the core material prepared through the dissociation (S110), the selection line (S120) and the concentration (S130) process by the method shown in FIG. Paper stock is mixed in a specific weight ratio in a reservoir.

The weight ratio is different depending on the use of the cardboard to be manufactured, the range of the quality similar to the cardboard produced using conventional waste paper, such as strength, bonding, smoothness, etc. does not appear significantly, the weight ratio is about 1 to 20wt%.

Next, in step S320, the core material of the deep-water layer mixed with the papermaking raw material is added to the paper machine. Then, after the post-treatment process such as formation of the layer (S140), compression dehydration (S150), drying (S160), coating (S170), calendering (S180), winding (S190) process as shown in FIG. A cardboard having a layered structure as shown in Fig. 1 is produced.

Therefore, by the above process by physically treating the sawdust generated during processing wood processing to obtain a raw material for papermaking can obtain an alternative raw material due to the shortage of resource recycling and waste paper supply, the alternative raw material is mixed with the core material of the deep seam layer cardboard Compared to the case where 100% waste paper is used, there are less foreign matters and the strata structure is improved, and the drier load is reduced, so that the productivity, thickness, and stiffness can be improved, and thus the yield and quality at low cost. Since it is possible to manufacture this excellent cardboard, it is possible to achieve the object of the present invention presented above.

Example 1

The cardboard is manufactured according to the method of the present invention using a weight ratio of 7 wt% of the papermaking material as the core layer, and compared with the cardboard produced by the conventional method using 100 wt% of cardboard as the core layer under the same conditions.

division Paperboard manufactured by the method of the present invention (using 7wt% papermaking raw material) Cardboard manufactured by the conventional method Altitude (° SR) 32 35 Basis weight (g / m ² ) 80.1 80.3 Thickness (㎛) 187 176 Density (g / cm ³ ) 0.43 0.46 Tensile Strength (KN / m) 2.1 2.2 Internal theft (time) 5 5

As a result, it was confirmed that the cardboard produced by the method of the present invention is 6% or more improved in the same basis weight compared to the cardboard produced by the conventional method. Density is the mass per unit volume divided by basis weight, and the lower the density, the better the thickness of the product. If the basis weight is different, the thickness can not be directly compared, so even if the basis weight is different, the thickness can be known through the density.

Example 2

The cardboard is manufactured according to the method of the present invention using a weight ratio of 5wt% of paper as the core layer, and the input position is changed to 50 wt% of the corrugated sheet and the old book as the core layer under the same conditions. Compare with the cardboard produced by.

division unit Invention Conventional speed m / min 370 350 Basis weight g / m ² 311 321 moisture % 6.6 6.8 thickness Μm 385 381 density g / cm ³ 0.81 0.84 Whiteness % 77.5 77.5 Smoothness sec 340 350 asperity
(Roughness) Top side Μm 1.49 1.48 Back side 6.49 6.43 rigidity
(Stiffness) MD gcm 123 119 CD 48 44 MD / CD - 2.56 2.70

As a result, the paperboard produced by the method of the present invention improved about 6% of the productivity compared to the paperboard manufactured by the conventional method, and a good density product was obtained while reducing the basis weight by more than 10 g / m ² due to the increase in thickness. . Smoothness, stiffness, etc. showed comparable characteristics in spite of the decrease in basis weight.

Example 3

The cardboard is manufactured according to the method of the present invention using a papermaking material having a weight ratio of 5 wt% as the core layer, and the same is used by the conventional method using 50 wt% of corrugated cardboard and old books as the core layer under the same conditions using another paper machine. Compare with different weights of cardboard produced.

division unit Invention Conventional speed m / min 187 175 Basis weight g / m ² 403 414 moisture % 8.6 8.6 thickness Μm 515 512 density g / cm ³ 0.78 0.81 Whiteness % 77.6 77.6 Smoothness sec 200 220 rigidity
(Stiffness) MD gcm 260 258 CD 120 117 MD / CD - 2.17 2.21

The result of comparison, was a carton produced according to the present invention how the productivity improvement of about 7% in comparison with the cardboard manufactured by the conventional method, while still decreases by more than a basis weight 11g / m ² because of the thickness increase and other physical properties of a comparable product Could get Therefore, even if the paper machine and the basis weight conditions were different, the increase in thickness and productivity could be confirmed.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. .

The present invention is industrially applicable in the field of cardboard manufacturing and its application.

1 is a cross-sectional view of the cardboard

2 is a flow chart showing the cardboard manufacturing process

Figure 3 is a flow chart showing an embodiment of a papermaking raw material manufacturing method according to the present invention

4 is a flow chart showing one embodiment of a cardboard manufacturing method according to the present invention;

<Explanation of symbols for the main parts of the drawings>

10: cardboard 11: coating layer

12: surface layer 13: subsurface layer

14: deep layer 15: rear layer

Claims (5)

Mixing wood fibers as a raw material for papermaking at a specific weight ratio with the core layer material subjected to dissociation, selection, and concentration; In step by the step of adding the core material layer of the papermaking material mixed to the paper machine to form a ground layer, the step of drying after compression dehydration; Cardboard manufacturing method comprising a. The method of claim 1, A paperboard manufacturing method, characterized in that the average particle diameter of the wood fibers is 80 to 500㎛. The method of claim 1, Paperboard manufacturing method characterized in that the mixed weight ratio of the wood fiber and the core material of the core layer is 1 to 20wt%. The method of claim 3, wherein The cardboard manufacturing method is: Forming a coating layer on the ground layer formed by the step; Flattening and smoothing the surface of the ground layer on which the coating layer is formed to form cardboard; Winding and winding the calendered cardboard; Carton manufacturing method characterized in that it further comprises. The method of claim 1, The wood fibers are: A method of manufacturing cardboard, characterized in that the sawdust, which is a by-product of processing wood, is pulverized to have a predetermined range of length using a grinder, and passed through a screen to remove foreign substances and sawdust having a size larger than a specific length.

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