KR100792253B1 - The Strength Improvement Method of Old Corrugated Container Paper and The Same apparatus - Google Patents

Abstract

The present invention relates to a method and apparatus for improving the strength of the corrugated cardboard for recycling of the corrugated cardboard, the strength improving method of the corrugated cardboard is a paper forming step of grinding the corrugated cardboard to a predetermined size or less and mixed with water to form a paper; A paper concentration step of concentrating the stock to a predetermined concentration; A reforming step of swelling the keratinized fibers by rotating blow for a predetermined time while dropping the concentrated paper in the paper concentration step; Including,

The apparatus for improving the strength of the corrugated cardboard used in the reforming step includes a cylindrical body made of a transparent material having both upper and lower openings to facilitate the input and discharge of concentrated paper, and the paper injected while being rotated inside the cylindrical body. A hitting part, a main body fixed to a floor and supporting the cylindrical body by using a holder, a driving part installed on the main body to drive rotation of the hitting part, and a control part controlling the operation of the driving part.

Therefore, it is possible to improve the repair and strength of the stock without large change in fiber length without using expensive equipment or operation cost.

Corrugated cardboard, high paper, swelling, fiber sheet, tear strength, paper, pulp, refining, beating, batting

Description

Strength Improvement Method of Old Corrugated Container Paper and The Same apparatus

1 is a flow chart illustrating a method of improving the strength of the corrugated cardboard notice according to the present invention.

Figure 2 is a block diagram showing a device for improving the strength of the corrugated cardboard according to the present invention.

3 is a detailed view showing a part of the striking portion, which is a main component of the present invention.

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

10: control unit 11: main body

12: holder 13: drive section

14: cylinder 15: blocking rib

20: hitting portion 21: saving saving

22: rotary blow blade 23: rotary blade

The present invention relates to a method and apparatus for improving the strength of corrugated cardboard for recycling of corrugated cardboard, and in particular, by using the rotary striking technique to strike the concentrated material by inducing fiber swelling without changing the fiber length to improve the strength of the recycled paper It relates to a method and apparatus for improving the strength of corrugated cardboard to be possible.

Korea's total tributary production amounted to 11 million tons in 2004, making it the 8th largest in the world. Among them, the production of corrugated cardboard, which is the core of product packaging, accounts for more than 30% of the total tributary production. Corrugated paper as a packaging material has the advantage of easy printing and processing, excellent strength to weight and recycling. As such, the corrugated cardboard base, which occupies a large portion of the domestic paper industry, is produced mainly from domestic highland paper, which is a synonym for environmentally friendly paper.

Corrugated paper with such environmentally friendly characteristics causes many technical and quality problems as the raw paper is used as a raw material, and the recycled paper made of recycled fiber has a natural strength due to the use of recycled recycled paper as a raw material. It is significantly lowered compared to paper made of pulp. In general, pulp fibers are contaminated due to keratinization and foreign matter adhered to the surface of the fiber as the recycling process is repeated.As the fiber becomes keratinized or the adhesion area of contaminants on the surface of the fiber increases, hydrogen bonds between the fibers are inhibited. The strength is lowered.

When the strength of the paper is weak, the usual measures are to increase the basis weight of the paper or to mix high quality fibers. However, increasing the basis weight of the paper requires more notification, causing problems such as an increase in process wastewater and solid waste, an increase in energy consumption and cost, and the like. In addition, in order to improve the strength of the paper when blending high-quality fibers, that is imported paper or natural kraft pulp, there is an unreasonable problem that not only increases the cost but also decreases the recycling rate of domestic paper.

In spite of the above problems, the demand for corrugated cardboard with excellent strength is increasing according to the strategy of upgrading products and the standard of living, and the amount of imported corrugated cardboard with excellent strength is increasing day by day. In order to replace the demand for such high quality corrugated cardboard with domestic corrugated cardboard, there was no alternative other than the use of unbleached kraft pulp as a raw material due to technical limitations. Therefore, in order to save foreign currency, it is required to develop a new technology for improving the strength and regenerating high-quality corrugated cardboard by improving the disadvantages of domestic cardboard having low strength.

In general, a method of improving the strength of highland paper is to treat the fiber by using a low concentration disk refiner. In other words, the raw material diluted to a concentration of about 4% is mechanically crushed by feeding between the rotor (Rotor) and the stator (rotator) is rotated at high speed without additional concentration. According to the low-concentration beating treatment method, the fiber is swelled and fibrils are formed on the surface to improve the flexibility of the fiber and improve the strength, and to promote the defibration of undissociated debris to improve the uniformity of the paper. Can be.

However, deterioration in dehydration due to keratinization and short fiberization of recycled high-grade pulp has recently emerged as a serious problem, and is derived from the decrease in production efficiency due to dehydration deterioration rather than the benefit of strength improvement using low-density disc refiners. Disadvantage is growing. In particular, the beating treatment for corrugated cardboard is contraindicated due to the disadvantage that the dehydration of the paper material is sharply lowered due to degradation of the fiber length and excessive generation of fine powder. In general, fine powders, which refer to inorganic matters and short fibers having a size of 75 μm or less, have been a factor of lowering productivity by inhibiting dehydration of wet paper peeling paper during papermaking. Normally, as the regeneration treatment is repeated according to the keratinization of the fiber, the content of fine powder increases, but the amount of fine powder is increased to about half of the total material due to the repeated regeneration treatment.

Of course, in order to improve the dehydration of the corrugated cardboard, there have been attempts to increase the headbox concentration of the paper machine or to add a polymer additive for promoting dehydration. However, such a method may damage the paper, thereby reducing the strength and post-processability of the paper. There is a problem. In addition, as the white water of the corrugated cardboard production process is being closed for water conservation and environmental conservation, the retention of various paper additives will gradually decrease, and the accumulated additives will reduce the chemical oxygen demand (COD) and biological oxygen of the process water. The demand quantity (BOD) increases. As a result, it is difficult to avoid the problem of dehydration deterioration due to the fine paper during the papermaking of the corrugated cardboard as a main raw material in the conventional cardboard manufacturing technology. Therefore, the development of environmentally friendly new waste paper processing technology is required.

Accordingly, as a method for restoring the flexibility of the keratinized fiber, a new physical treatment method suitable for low-altitude paper has been developed in addition to the simple mechanical treatment through the low-concentration beating, and a high-density refining treatment method is typical. High concentration refining treatment method is carried out at a concentration of more than 20% higher than the case of the existing low concentration beating, has been attracting attention because it has the effect of preventing the degradation of fiber length and tear strength, and improve the elongation of the paper.

However, the above-described high concentration refining treatment method has a disadvantage in that the tensile strength is somewhat inferior to the conventional low concentration blasting treatment method, and the equipment cost is high and the no-load power is consumed, resulting in high operating costs.

As a result, conventional high-density refining treatment methods are also not suitable for improving the strength of low-cost corrugated cardboard, which is made of low-grade corrugated cardboard. Therefore, the development of economical and environmentally friendly technology for strengthening the strength of corrugated cardboard is required.

The present invention has been made to overcome the deterioration of the pulp fiber quality due to fiber keratinization and contamination at the time of recycling and the deterioration of the strength of the corrugated cardboard, which is a fundamental and chronic problem in the production of domestic corrugated cardboard. It is an object of the present invention to provide a method and apparatus for improving the strength of corrugated cardboard, which induces swelling of fibers without changing the fiber length, thereby improving the strength of recycled corrugated cardboard.

According to the method of improving the strength of the corrugated cardboard of the present invention for achieving the above object, a paper forming step of grinding the corrugated cardboard to a predetermined size or less and mixed with water to form a paper; A paper concentration step of concentrating the stock to a predetermined concentration; A reforming step of swelling the keratinized fibers by rotating blow for a predetermined time while dropping the concentrated paper in the paper concentration step; It includes, wherein the modifying step is characterized in that the diameter of the blade for the rotary blow is repeatedly performed so that the blow is made for a processing length of 10 to 20 minutes or 10 to 20m at a rotational speed of 500rpm conditions.

In addition, according to the strength improvement method of the corrugated cardboard notice of the present invention, the paper stock concentration step is characterized in that the paper stock is concentrated to 18 to 22%.

In addition, according to the method of improving the strength of the corrugated cardboard notice of the present invention, the reforming step is characterized in that the impact time or treatment length is determined according to the falling speed of the paper and the rotational speed of the rotary blow blade.

delete

In addition, according to the strength improvement apparatus of the corrugated cardboard notice according to the present invention, a cylindrical body of a transparent material, both the upper and lower openings to facilitate the input and discharge of the concentrated paper, and the paper input while being rotated inside the cylindrical body A striking part to strike, a main body fixed to the floor to support the cylindrical body using a holder, a driving part installed on the main body to drive the striking part to rotate, and a control unit controlling the operation of the driving part. It is done.

In addition, according to the strength improving apparatus of the corrugated cardboard notice of the present invention, the striking portion includes a rotating shaft which is connected to the drive unit and rotated, and a rotating strike blade provided on the rotating shaft at regular intervals and having at least two rotary blades It is characterized by.

In addition, according to the strength improving apparatus of the corrugated cardboard notice of the present invention, the cylindrical body is provided with a blocking rib of a predetermined width protruding in a radial direction at a position corresponding to the blade for the rotary blow, the blade for the rotary blow and the A predetermined gap is present between the ends of the blocking ribs.

In addition, according to the strength improving apparatus of the corrugated cardboard notice of the present invention, the rotary blade for blades is characterized in that the rotary blade is disposed at an angle different from the rotary blades of the other rotary blow blades on the upper and lower sides.

In addition, according to the strength improvement apparatus of the corrugated cardboard notice of the present invention, the rotary blow blade is 500mm or more in diameter, the rotational speed is 500rpm or more, characterized in that 10 to 12 pieces are installed every about 1m length.

The above features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings. Prior to this, the terms or words used in the present specification and claims are based on the principle that the inventor can appropriately define the concept of terms in order to explain the invention in the best way. It should be interpreted as meanings and concepts corresponding to

Hereinafter, a method and apparatus for improving the strength of the corrugated cardboard notice of the present invention with reference to the accompanying drawings.

1 is a flow chart illustrating a method of improving the strength of the corrugated cardboard according to the present invention, Figure 2 is a block diagram showing a strength improving apparatus of the corrugated cardboard according to the present invention, Figure 3 is a striking portion of the main component of the present invention Some of the details are shown.

The method of improving the strength of the corrugated cardboard of the present invention, a paper forming step of forming a paper by crushing the corrugated cardboard to a predetermined size or less and water, and a paper concentrating step of concentrating the paper to 18 ~ 22%, and the concentrated A reforming step of swelling the keratinized fibers by rotating blow for a predetermined time while dropping the stock.

A screw press or a belt press can be used for the concentration of the stock, but it is preferable to use a belt press capable of concentrating the stock without bending or bending the fibers. If the concentration of the paper is less than 18%, the paper sticks to the inner wall of the rotary blower when the rotary blower is difficult to properly handle. If the concentration exceeds 22%, the stickiness of the paper becomes low, and the impact energy caused by the rotary blade is dissipated. In addition, the blow effect on the fiber is poor, making the swelling of the keratinized fiber difficult, as well as the scattering of the material may contaminate the working environment.

The impact time or treatment length for the stock in the reforming step is determined according to the falling speed of the stock and the rotational speed of the rotary blow blade. In other words, the diameter of the blade for the rotary blow is repeatedly performed so that the blow is made for a distance of 10 to 20 minutes or a distance of 10 to 20m under the conditions of a rotational speed of 500rpm. If the impact time for the material is too short (less than 10 minutes), the impact energy from the rotary striker is not sufficiently transmitted to the material, and the strength improvement effect is insignificant. After the reforming of the material due to the sufficient amount of energy consumption is only increased, there is a problem that almost no further improvement in strength

The modifying step is performed through the apparatus for improving the strength of corrugated cardboard as described below.

The apparatus for improving the strength of corrugated cardboard according to the present invention includes a cylindrical body 14 made of a transparent material in which both the upper and lower portions thereof are opened to facilitate the input and discharge of the concentrated paper material, while being rotated inside the cylindrical body 14. A striking portion 20 striking the inputted material, a main body 11 fixed to the bottom to support the cylindrical body 14 by using a holder 12, and installed in the main body 11 and the striking portion ( And a control unit 10 for controlling the operation of the driving unit 13.

Here, the striking unit 20 is a rotational shaft 21 is connected to the drive unit 13 and rotated, a plurality of rotational striking provided on the rotary shaft 21 at a predetermined interval and having three rotary blades 23 A dragon blade 22. In addition, the cylindrical body 14 is provided with a blocking rib 15 having a predetermined width protruding in a radial direction at a position corresponding to the rotary hammering blade 22, and the rotary hammering blade 22 and There is a predetermined gap between the ends of the blocking rib 15.

At this time, the rotary blade 22 is preferably such that the rotary blade 23 is disposed at an angle different from the rotary blade 23 'of the other rotary blow blade 22 installed on the upper and lower sides. Specifically, the rotary blow blade 22 has a diameter of 500 mm or more, a rotation speed of 500 rpm or more, and preferably about 10 to 12 pieces are installed every about 1 m in length.

The strength improvement apparatus of the corrugated cardboard notice of the present invention configured as described above is to modify the paper by hitting the paper injected into the upper portion of the cylindrical body while the rotary blade of the rotary blow blade is rotated.

After crushing the corrugated cardboard, the concentrate concentrated at a concentration of 18 to 22% is introduced into the upper portion of the cylindrical body 14, and the rotary shaft 21 is rotated through the driving unit 13, and the rotary blower is installed on the rotary shaft 21. The rotary blade 23 of the blade 22 hits the stock. At this time, the stock can flow along the inner wall of the cylindrical body 14 by the centrifugal force due to the rotation of the rotary blade 23, but due to the blocking rib 15 provided in the cylindrical body 14 in the center direction As you move, you will continue to be hit.

Therefore, the paper material is hit by the rotary blade 23 while falling from the upper portion to the lower portion of the cylindrical body 14, the cylindrical body 14 of about 1m long to take about one minute to fall time. do. The paper stock exiting to the lower portion of the cylindrical body 14 is again put into the upper portion of the cylindrical body 14 to be repeatedly hit by the paper, and the blow time for the paper is approximately 10 to 20 minutes.

In order to compare the strength improvement effect according to the strength improvement method and the existing high concentration refining method of the corrugated cardboard of the present invention, the following experiment was carried out, as a result was obtained in Table 1 and Table 2.

Experimental Example

Collect the concentrated paper by dissociating the domestic corrugated cardboard from the screw press of D, a corrugated cardboard producer, and change the rotational speed of the rotary striker at 357, 437, and 530 rpm, respectively, for 10 times the number of passages of the cylindrical body. It was set up with 20 times and high concentration rotary blow treatment. The concentrated stock collected at the production site had a concentration of about 20%, consisting of about 75% fiber and 25% fines (ash (inorganic filler) and fine fiber).

The paper thus treated was diluted and dissociated at a concentration of 4% for 15 minutes with a standard taffy dissociation, and then a paper specimen having a basis weight of 150 g / m 2 was produced with a laboratory circular water paper machine.

<Comparative Example>

The same feedstock as the experimental example was taken and beaten for 3, 6, 9 and 12 minutes with a Valley Valley Beater. The treated material was diluted and dissociated at a concentration of 4% for 15 minutes using a standard taffy dissociation method in the same manner as in the experimental example, and then paper specimens having a basis weight of 150 g / m 2 were produced using a laboratory circular water paper machine.

The freeness, water retention, and fines content of the stocks obtained by the above experimental and comparative examples were measured, respectively, and the apparent density, burst index, tensile index, and elongation of the paper specimens made from the papers were measured, respectively. It is shown in Table 1 and Table 2 below.

Looking at Table 1, the degree of freedom of the material using the rotary hammer was more pronounced as the processing length of the rotary hammer was longer (actually, as the number of passes of the rotary hammer increased), and the faster the rotation speed of the rotary hammer. . In addition, the longer the processing length of the rotary striker, the faster the rotational speed of the rotary striker, it can be seen that the strength of the burst index, tensile index, etc. increases, as the effect of improving the strength can be confirmed by increasing the repair of the paper This is the result of improved fiber flexibility.

In addition, it can be seen that the water retention, strength, and density are increased without a large change in fiber length, even when compared with the conventional high concentration refining method shown in the comparative example.

In addition, referring to Table 2, it can be seen that the fiber length of the sample paper produced by the example also does not change as much as the fiber length of the sample paper produced by the comparative example.

As a result, when using the method and apparatus for improving the strength of the corrugated cardboard of the present invention, it is possible to increase the repairability and strength and density of the paper without a large change in fiber length.

Although the preferred embodiment of the present invention has been described above, the scope of the present invention is not limited only to such specific embodiments, and those skilled in the art may appropriately change within the scope described in the claims of the present invention. This will be possible.

As described above, according to the method and apparatus for improving the strength of the corrugated cardboard sheet of the present invention, there is an effect of improving the repairability and strength of the stock without large change in fiber length without using expensive equipment or operating costs.

In addition, according to the method and apparatus for improving the strength of corrugated cardboard of the present invention, the effect of improving the strength of the recycled corrugated cardboard, while reducing the degree of freedom by inducing the swelling of the fiber without changing the fiber length through the impact on the paper. There is.

Claims (9)

Paper forming step of crushing the corrugated cardboard up to a predetermined size and mixed with water to form a paper; A paper concentration step of concentrating the stock to a predetermined concentration; A reforming step of swelling the keratinized fibers by rotating blow for a predetermined time while dropping the concentrated paper in the paper concentration step; Including, The reforming step, the strength of the corrugated cardboard notice, characterized in that the impact time or processing length is determined according to the falling speed of the paper and the rotational speed of the rotary blow blade. The method of claim 1, Wherein the paper concentration step, the strength of the corrugated cardboard, characterized in that the concentration of the paper to 18 to 22%. delete The method of claim 1, The reforming step, the diameter of the blade for rotating the hammer is improved to the strength of the corrugated cardboard notice, characterized in that it is repeatedly performed for 10-20 minutes or a processing length of 10 to 20m at a rotational speed of 500rpm conditions . A cylindrical body 14 made of a transparent material having both upper and lower openings to facilitate the input and discharge of the concentrated paper, and a blower 20 that strikes the input paper while being rotated inside the cylindrical body 14; A main body 11 fixed to the floor and supporting the cylindrical body by using the holder 12, a driving part 13 installed on the main body 11 to drive the impacting part 20 to rotate, and the driving part Strength improvement apparatus of the corrugated cardboard notice, characterized in that it comprises a control unit for controlling the operation (10). The method of claim 5, The striking unit 20 is a rotary hammer blade which is connected to the drive unit 13 and rotated, and the rotational shaft 21 is provided at a predetermined interval and provided with at least two rotary blades (23) Strength improvement apparatus of the corrugated cardboard notice, characterized in that it comprises a (22). The method according to claim 5 or 6, The cylindrical body 14 is provided with a blocking rib 15 having a predetermined width protruding in a radial direction at a position corresponding to the rotary hammering blade 22, and the rotary hammering blade 22 and the blocking Strength improvement apparatus for corrugated cardboard notice, characterized in that a predetermined gap exists between the ends of the rib (15). The method of claim 6, The rotary striking blade 22 is to improve the strength of the corrugated cardboard notice, characterized in that the rotary blade 23 is disposed at an angle different from the rotary blade 23 of the other rotary striking blade 22 installed on the upper and lower sides. Device. The method of claim 6, The rotary blow blades 22, the diameter of 500mm or more, the rotation speed is 500rpm or more, the strength improvement apparatus of the corrugated cardboard notice, characterized in that 10 to 12 pieces are installed every about 1m length.

Images