KR20080102093A - Manufacturing method of shock-absorbing materials using thermomechanical pulping of wastewood and wastewood shock absorbing material using the same - Google Patents

Abstract

A method for manufacturing shock-absorbing materials is provided to more soften woody tissue of small-diameter logs or waste residual logs by firstly performing a cooking process through a thermo- machine before pulping. A method for manufacturing shock-absorbing materials through thermo-mechanical pulping of waste logs comprises the following steps. The waste residual logs or small-diameter logs generated when processing timber are chipped so as to have cross section of 1.0 to 5.0mm and length of 5 to 20mm(S10). The chipped waste residual logs or small-diameter logs are cooked through a digester which is heated by the temperature of 120 to 140°C, and then are pulped by a predetermined refiner. Thermo-mechanical pulp is mixed with starch, and then is processed by dual vacuuming.

Description

Manufacturing Method of Shock-Absorbing Materials Using Thermomechanical Pulping of WasteWood and WasteWood Shock Absorbing Material Using The Same}

1 is a photograph showing an egg tri, etc. using a pulp mold according to the prior art,

2 is a cross-sectional view showing a pulp mold manufacturing apparatus according to the prior art,

3 is a perspective view and an internal sectional view of a pulp mold according to the prior art,

Figure 4 is a flow chart showing a method for producing a waste paper buffer material using the vacuum forming principle according to an embodiment of the present invention,

Figure 5 is a photograph showing a state in which the waste wood TMPC, waste wood BTMP, waste MDF is used as the base material for waste wood in the embodiment of the present invention dry,

6 is a cross-sectional view showing an example of a vacuum forming apparatus that operates on the principle of vacuum dehydration in both up and down directions according to one embodiment of the present invention.

Figure 7 is a micrograph showing the internal structure of the buffer material bi-directional pressure-molded according to an embodiment of the present invention,

8 is a schematic diagram showing the volume change between the pulp turbidity used in one embodiment of the present invention and the waste paper buffer material after the vacuum forming step according to the present invention,

9 is a schematic diagram showing a surface sizing process of the buffer material according to an embodiment of the present invention,

Figure 10a to 10d is a photograph of the lamella of the buffered material, respectively, according to an embodiment of the present invention,

11A, 11B, and 11C are micrographs showing a cross section of a conventional pulp mold and a styro product and a TMP buffer material according to an embodiment of the present invention.

12 is a schematic diagram showing a mechanism in which a conventional pulp mold and an external force applied to a buffer material according to an embodiment of the present invention are absorbed and removed.

FIG. 13 is a graph illustrating changes in apparent density of a buffer material according to changes in decompression time of a pressure reducing machine according to an embodiment of the present invention, compared with values of pulp mold and styrofoam. FIG.

14 is a graph showing the elastic modulus of the buffer material made of waste residual material TMP according to an embodiment of the present invention compared with the elastic modulus of styrofoam,

15 is a graph showing changes in apparent density of buffer materials according to the amount of cationic starch added according to an embodiment of the present invention.

16 is a graph showing the change in elastic modulus of the buffer material according to the amount of the cationic starch according to an embodiment of the present invention,

17 is a graph measuring the amount of water remaining in the buffer material immediately before drying when the amount of starch added according to an embodiment of the present invention by an MS45 Moisture Analyzer,

18 is a graph showing the change in apparent density of the buffer material according to the input amount of the raw material according to an embodiment of the present invention,

19 is a graph showing a change in the elastic modulus of the buffer material when the weight of the fiber input during the manufacture of the buffer material in accordance with an embodiment of the present invention,

20 is a graph showing a change in apparent density according to an embodiment of the present invention,

21 is a graph showing a change in the elastic modulus of the buffer material according to the surface sizing treatment and the addition amount of the cationic starch according to an embodiment of the present invention,

22A and 22B are photomicrographs of Olympus (SZ61, Japan) showing the surface structure before and after the surface sizing process, that is, before the cationic starch forms the film film and after the film film is formed for the buffer material according to one embodiment of the present invention. ego,

FIG. 23 is a graph illustrating a change in porosity according to a change in the amount of cationic starch, compared to a pulp mold and styrofoam, according to an embodiment of the present invention.

24 is a graph showing a change in contact angle of a buffer material when a buffer material is prepared by adding AKD, an internal additive size agent, together with a TMP raw material according to an embodiment of the present invention.

FIG. 25 is a graph showing changes in apparent density with changes in the amount of cationic starch added when recycling buffer materials according to an embodiment of the present invention.

FIG. 26 is a graph illustrating the change in the elastic modulus of the buffer material according to the amount of cationic starch when the buffer material is made again using the TMP buffer material made as a raw material according to an embodiment of the present invention. ego,

27 is a graph showing the degree of change in porosity inside the buffer material with the change in the amount of cationic starch added as the TMP buffer material is recycled according to an embodiment of the present invention.

28 is a graph showing the change in the whiteness of the buffer material by the bleaching of the raw material according to an embodiment of the present invention,

29 is a graph showing a change in thermal conductivity of the TMP buffer material according to the amount of starch added according to an embodiment of the present invention,

30 is a graph showing a change in thermal conductivity when the surface of the TMP buffer material surface sizing treatment according to an embodiment of the present invention,

31 is a view showing a result of observing the crack state of the buffer material and the state of the inner glass after dropping the buffer material made of TMP and EPS in the corner direction according to an embodiment of the present invention,

32 is a view showing the results of observing the state of the buffer material and the glass when the buffer material made of TMP and EPS dropped to the side according to an embodiment of the present invention,

33 is a view showing the results of observing the damage of the buffer material and the glass when the buffer material made of TMP and EPS dropped in a plane according to an embodiment of the present invention.

The present invention relates to a method for producing a buffer material using waste wood, and more particularly, to a method for producing a buffer material through thermomechanical pulping of waste remnant or small diameter material, and a waste wood buffer material accordingly. More specifically, the process of cooking through a cooking apparatus heated to a predetermined temperature range before the pulping of the waste residue or the small diameter material by disintergating is characterized by preceding.

Types of packaging buffer materials conventionally used in the market include styrofoam, pulp mold, polypropylene, polyethylene, and the like. Here, except for pulp mold, hardly decomposable packaging materials are difficult to decompose in a natural state. Styrofoam is known by various names such as foam polystyrene, styrofoam, foamed styrene, styropol, and is sometimes abbreviated as EPS (Expanded Polystyrene) after the English initials. Styropol is a trademark of BASF AG, a German general chemical company, and Styrofoam is a trademark of insulation material of Dow Chemical Co., Ltd., and is widely known in Korea as Styropol. Styrofoam is a foamed product in which hydrocarbon gas such as pentane or butane is inflated with polystyrene resin and then expanded by steam, and 98% of the volume is air and the remaining 2% is a resin.

However, the above-mentioned hardly decomposable packaging materials are made from fossil raw materials, and due to the disadvantage of being difficult to decompose in a natural state, there is a strong movement to prohibit the use of styrofoam in developed countries. The problem of environmental pollution due to hardly degradable packaging has a direct impact not only on domestic environmental regulations but also on trade between countries. Accordingly, as the regulations on hardly degradable packaging materials are tightened around the world, the demand for eco-friendly packaging materials is expected to increase rapidly, and the demand for eco-friendly buffer materials manufactured from waste paper fibers is expected to increase rapidly.

According to this flow, in recent years, a buffer material manufactured using waste paper fibers is produced under the name of a pulp mold, and is used as a substitute for styrofoam for packaging. As shown in FIG. 1, the first use of the pulp mold was an egg tray, which has since been widely used for packaging industrial and consumer products. Such a pulp mold is manufactured using a pulp mold manufacturing apparatus as shown in FIG. 2, and then, after a mold is manufactured according to a packaged product or a purpose, a predetermined amount of dissociated waste paper suspension is poured into a forming box and then contained in the pulp suspension. Refers to a molded product made by dehydrating and drying excess water in one direction together with pressurization.

Since the pulp mold itself is made of a very dense fiber structure (dense structure) as shown in FIG. 3 and lacks a buffering force, the pulp mold itself forms a free space of a predetermined size in the pulp mold through the mold. The shock or vibration must be prevented from being transmitted directly to the packaged goods.

In addition, the method of manufacturing a buffer material by expanding and extruding the waste paper with the pulp mold manufacturing apparatus as described above also due to the characteristics of the starch used as the expanding aid, if the moisture content of the buffer material itself does not maintain a certain level or more There is a problem that it is very difficult to maintain the buffer force of.

Accordingly, the necessity of a technology that can produce a buffer material in a variety of environmentally friendly materials in addition to the waste paper is always present situation, the present invention relates to the manufacture of a buffer material using waste wood or small diameter materials.

The present invention has been made in order to solve the above problems, not to use styrofoam or waste paper as in the prior art, but to produce a buffer material using the waste residue or small diameter material generated during forest or wood processing as a base material will be. In particular, prior to pulping the chipped waste remnants or small hardwoods by pulping with disintergating, the process of cooking the waste residues or small hardwoods further softens the wood. It is intended to facilitate and excellent pulping through.

In addition, in mixing the hot-pulverized pulp (TMP) pulped with the heated cooking apparatus and the islander as described above with starch, by mixing the thermo-pulverized pulp (TMP) and starch at a predetermined capacity and ratio, The aim is to significantly increase the buffering performance by minimizing the change in the apparent density and elastic modulus while maintaining sufficient shape of the material.

Furthermore, by providing the density and modulus of elasticity of the waste wood buffer material produced in the above manner to the level of conventional foamed styrofoam or lower than the conventional pulp mold and foamed styrofoam, it is to provide a remarkably excellent buffering effect.

Buffer material manufacturing method through the thermal system pulping of waste wood according to the present invention for achieving the above object, the cross-sectional area within the range of 1.0 ~ 5.0㎜ and 5 ~ 20 in the waste residue or small wood generated during forest or wood processing Chipping to a length in the mm range; Cooking the chipped waste residue or small hardwood through a cooking apparatus heated in a range of 120 to 140 ° C., and then pulping using a predetermined disintergating process; And mixing the heated cooker and the pulp heat-treated pulp (Thermomechanical Pulp, TMP) with starch, and then vacuuming in both directions using a vacuum forming apparatus capable of dual vacuuming. Dehydration to produce a shock absorbing material (shock absorbing material); characterized in that it comprises a.

Here, the step of pulping, cooking the chipped waste residue or small diameter material in the range of 120 ~ 140 ℃ and cooking for 1 to 5 minutes through a cooking apparatus having an operating capacity within the range of 3 ~ 4kg / cm ² After that, it is preferable to pulp the freeness of the pulp fibers to 650 to 700 mL CSF using a predetermined sea island.

In addition, the thermosetting pulp (TMP) is mixed with starch, it is more preferable to mix 75-100 g of the thermosetting pulp (TMP) with starch within the range of 10 to 30% by weight of the thermosetting pulp (TMP). .

Furthermore, the method for producing a buffer material through thermo-system pulping of the waste wood comprises the steps of: drying the buffer material; And performing a surface sizing treatment on the surface of the dried buffer material.

In addition, another embodiment for achieving the other object of the present invention is manufactured by the above-described method for producing a buffer material through the thermomechanical pulping of the waste wood, the elastic modulus is in the range of 300 ~ 900 kPa, or the density Is a waste wood buffer material, characterized in that in the range of 0.08 ~ 0.12g / cm ³ .

Hereinafter, one preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. The invention may be better understood by the following examples, which are intended for purposes of illustration of the invention and are not intended to limit the scope of protection defined by the appended claims.

Figure 4 is a flow chart showing a buffer material manufacturing method through the thermo-system pulping of waste wood according to an embodiment of the present invention. As shown here, the manufacturing method of the waste paper buffer material according to the present invention first, chipping the waste residues or small-size materials generated during forest processing or wood processing to a cross-sectional area within the range of 1.0 ~ 5.0mm and length within the range of 5 ~ 20mm. After chipping (S10) and cooking the chipped waste residue or small diameter material through a cooking apparatus heated in the range of 120 to 140 ° C., pulping using a predetermined disintergating process. (S20), and mixed with the starch of the heated cooker and the pulp thermothermal pulp (TMP) with the starch (S30), a vacuum capable of two-way vacuum (dual vacuuming) Vacuum dehydration in both directions using the molding apparatus to form a shock absorbing material (S40).

In particular, the present invention through the cooking equipment heated the chipped waste residue or small diameter material within the range of 120 ~ 140 ℃ to be suitable for producing a buffer material with waste residue or small diameter material generated during forest or wood processing After cooking, it is characterized in that the step (S20) of pulping (pulping) using a predetermined disintergating (disintergating).

The present invention does not use styrofoam or waste paper as a conventional material for manufacturing buffer materials, but uses waste residues or small hardwoods generated during processing of forests or wood as basic materials, and for this purpose, specially chipped waste residues or small hardwoods are used. Before pulping with disintergating, the process of cooking through a cooking apparatus heated to a predetermined range is performed.

Specifically, as shown in FIG. 4, firstly, chipping waste residues or small hardwoods generated during processing of forests or wood into a cross-sectional area within a range of 1.0 to 5.0 mm and a length within a range of 5 to 20 mm ( It goes through S10).

Waste residue or small diameter, which is a basic material used to manufacture a buffer material according to the present invention, refers to waste logs generated in forests or other wood processing plants, and is treated with saw dust or chips. It includes a feed or a cut plate. In addition, in recent years, a considerable amount of waste MDF is generated when remodeling or interior work in a building is in progress, and the present invention may recycle such waste MDF to manufacture a buffer material.

In order to manufacture a buffer material using such waste wood, it is necessary to first pulp raw materials, and for this purpose, in the present invention, the waste wood is chipped to a predetermined size. The process of pulverizing and trimming the raw materials to a certain size for pulping is common, but in the present invention, for the process of cooking wood, which will be described later, the cross-sectional area of the waste wood has an area in the horizontal and vertical range of 1.0 to 5.0 mm. The length is preferably in the range of 5 to 20 mm. If the size of the waste wood has an area or length smaller than the above-mentioned range, the bonding between the waste wood fibers is weakened in the cooking process and the pulping process described below, as well as the aforementioned range in the process of forming the finished product. This is because it is not necessary to have a smaller area or length, and if the area or length is larger than the above range, the effects of the cooking process and the sea island process described later are insufficient.

After chipping the waste wood as described above, the chipped waste wood and the like are cooked through a cooking apparatus heated in the range of 120 to 140 ° C., and then subjected to predetermined disintergating. By pulping, a thermomechanical pulp (TMP) is obtained (S20).

The present invention does not use styrofoam or waste paper as in the prior art, but manufactures a buffer material using waste residues or small hardwoods generated during forest or wood processing as basic materials, and for this purpose, waste chipped or narrowly chipped for this purpose. Before pulping the ash to disintergating, it is characterized in that it is cooked through a cooking apparatus heated in the range of 120 to 140 ° C. According to the present invention by prior to the process of cooking by hot air before pulping by further softening the wood of the waste residues or small diameter wood, there is an effect that can be easily and excellent pulping through the sea island.

Here, the cooking (蒸 解) refers to the process of making a pulp by putting a chemical in the pulp raw material and boiled in a kiln, in this process, the non-fibrous material contained in the plant raw material melts, the fibers are separated in a relatively pure state There are many ways to boil depending on the type of chemicals and the treatment conditions. In comparison, the process of pulping with the sea island is to crush the previously cooked waste wood into finer sizes by mechanical force.

Conventionally, when manufacturing the buffer material using the waste paper, etc., it is enough to simply cut the waste paper, etc. with a blender and pulverize, but if you want to manufacture the buffer material with waste wood, such as the present invention, simply cut with a blender By pulverizing alone, waste wood and the like could not be effectively decomposed, and thus, the starch could not be properly combined with the starch to prepare a pulp turbid liquid suitable for vacuum dehydration.

However, even in the case of manufacturing the buffer material from waste wood, such as the present invention, first through the cooking process, and then through a pulping step of pulverizing to a certain size, thermosetting pulp that can form a variety of strong bond between the components ( TMP) can be prepared. In particular, the temperature of the cooking apparatus for cooking is preferably in the range of 120 ~ 140 ℃, if the temperature is lower than 120 ℃ it is difficult to separate the fibers from the chipped waste wood, etc., if the temperature is higher than 140 ℃ bond between the constituent fibers Because this becomes very weak, the bond between the fibers is difficult.

The present invention is characterized in that the chipped waste wood, such as cooking and finely pulverized by pulping, such a pulping step, more specifically, chipped waste residue or small hardwood in the range of 3 ~ 4kg / cm ² After cooking for 1 to 5 minutes through a cooking apparatus heated within the range of 120 to 140 ° C with an operating capability within, the freeness of the pulp fibers is 650 to Pulping to 700 mL CSF is preferred. The cooking time of the cooking apparatus is preferably carried out for 1 to 5 minutes for the strength of the fibers contained in the waste wood, etc., if the temperature is maintained within the range of 120 ~ 140 ℃, more preferably within the range of 3 ~ 4kg / cm ² It was appropriate to treat the amount of waste wood. In addition, since the fiber shape is greatly influenced by the degree of sea island at the time of sea islands such as waste wood, it is preferable to seam so that the freeness of the pulp fibers is about 650-700 mL CSF.

Further, in the present invention, mixing the thermomechanized pulp (TMP) with starch, 75 to 100 g of the thermomechanized pulp (TMP) mixed with starch within the range of 10 to 30% by weight of the thermomechanized pulp (TMP). It is more preferable to do this because it is sufficient to maintain a constant shape of the buffer material while minimizing the change in the apparent density and modulus of elasticity to significantly increase the buffering performance. This will be described in detail in the following examples.

Meanwhile, foamed styrofoam, which is the most widely used cushioning material, is white and is visually imprinted to consumers. Accordingly, in the present invention, before mixing the TMP pulp with the starch as a raw material of the buffer material, after the bleaching treatment was prepared as a buffer material to compare the physical properties before and after bleaching. Bleaching conditions of the waste residue TMP were subjected to alkali and hydrogen peroxide bleaching to minimize environmental and economic impacts.

In addition, as described above, in the present invention, waste MDF generated when remodeling or interior work inside a building is performed as waste wood may be used. FIG. 5 (a) shows TMP pulp fibers made from waste and small diameter materials, (b) ) Shows fibers bleached TMP pulp fibers, and (c) shows fibers from which waste MDF is dry.

The pulping step (S20) as described above may further include preparing a pulp suspension by diluting the pulped sample as described above, which includes cationic starch against the pulped waste wood sample. This is a process that can be followed to add and produce the desired shape by vacuum forming. The concentration for diluting the pulped waste paper sample is not particularly limited, but it is preferable to dilute to 3% to prepare a suspension.

Next, a mixture of starch and thermomechanical pulp pulped with a heated cooking apparatus and a sea island is processed as described above (S30). This mixing of cationic starch is to enhance the binding force of TMP fibers. Cationic starch (Samyang Genex) having a degree of substitution (DS) of 0.06 is 0%, 10%, 20% and 30% based on the total weight of the dissociated fiber. It is preferable to mix | blend with. In addition, the cationic starch used herein is more preferably gelatinized at a temperature of about 80-85 ° C (S21), diluted to 1% (S22) prior to being put into the molding box.

Subsequently, the present invention is to prepare a shock absorbing material by vacuum-dehydrating the pulp turbid liquid mixed with the cationic starch up and down in both directions using a vacuum forming apparatus capable of two-way vacuuming (S40). ).

In the present invention, the vacuum forming method is included in the fiber suspension by applying a vacuum for about 5-10 seconds after molding the waste wood suspension into a predetermined shape in order to prevent excessive increase in compressive strength due to the use of starch. It utilizes the principle of producing a buffer material by removing excess water. Of course, starch may also be used as a molding aid to improve the bonding strength of the material, but the starch does not cause excessive increase in compressive strength because it only serves as a molding aid or a bonding enhancer. Increasing the compressive strength promotes densification of the buffer material, induces an increase in the compressive strength and the elastic modulus, thereby lowering the buffering performance of the material.

The manufacturing principle of the buffer material according to the present invention is largely different from the conventional pulp mold manufacturing method in that a pressing process by a hot press plate is not required after a waste sample suspension is put into a molding box. The present invention is a method of forming a buffer material to a large state (low density) by vacuum dehydration in both up and down directions using the principle of the vacuum molding apparatus as shown in FIG. Figure 6 is a cross-sectional view showing a vacuum forming apparatus that operates on the principle of vacuum dehydration in the vertical direction in accordance with the present invention. Specific examples of such a vacuum molding apparatus may be described in the Republic of Korea Patent No. 710876 filed and registered by the present inventors.

According to the present invention, unlike the pulp mold, when the water is removed from the internal structure of the buffer material, unlike the pulp mold, the tissue of the buffer material vacuum-formed in both directions is formed between the interfiber bonding. It is possible to suppress as much as possible so that there is an effect of creating a large number of empty spaces.

In the internal structure of the buffer material, the hydrogen bonds between the fibers are suppressed to form a loose fiber network as shown in Figs. 7A and 7B, so that many voids inside the tissue of the buffer material It remains as a function of absorbing external shocks, vibrations, or noises.

Figure 8 is a schematic diagram showing the volume change between the pulp turbidity used in the present invention and the waste paper buffer material after the vacuum molding step according to the present invention, which was dehydrated and dried after putting a 3% waste paper suspension in the molding box It shows a square buffer material with reduced volume. The overall size (width × length) does not decrease, but as the overall thickness decreases, the volume decreases. In this state, as in the conventional case, when excessive vacuum or press processes are applied, a large densification phenomenon occurs and the voids (or glass spaces) are closed from inside the tissue of the buffer material, so that the shock-absorbing ability is increased. It will disappear.

While the present invention cannot avoid volume changes due to unavoidable thickness reduction during dehydration and drying, it is necessary to properly control the vacuum application time so that the voids disappear within the tissue of the buffer material, that is, keep the density to a minimum. Become a key manufacturing technique. When manufacturing a buffer material having a small thickness according to the present invention, it is preferable to reduce the amount of the waste paper suspension added to the molding box.

In addition, the present invention may be subjected to a step (S50) of drying the buffer material prepared as described above (S50) and a surface sizing treatment (S60) on the surface of the dried buffer material. . Drying the buffer material is to remove excess moisture remaining in the buffer material, and the surface sizing is to prevent the microfibers from falling on the surface of the buffer material.

Example  One: Waste residue  or Small hardwood  Manufacture of buffer material using

According to the present invention for producing a cushioning material using the pressure molding method in a closed timber such as waste remnants, Division of Deoksan (Mt) softwood acids is less than 15 cm in diameter which collect in an academic rim (Pinus rigida , Pinus densiflora , Oak ( Fagus) multinervis , Quercus acutissima , Quercus variabilis ) and the like. In order to pulp waste residues such as conifers and oaks, chipping is about 2.5 × 2.5 × 10 mm and then 120-140 ° C., 3-4 kg / cm ² , in a cooking equipment After heating for 2 minutes to cook, and then pulping for 2 minutes in a sea island machine (Taeil Pore single disk refiner) to prepare a thermomechanical pulp (TMP). Here, the pulping of the waste residues was resolved such that the freeness of the fibers was about 650-700 mL CSF.

Furthermore, a part of the TMP pulp thus prepared was bleached, and the bleaching conditions of the waste residue TMP were subjected to alkali and hydrogen peroxide bleaching to minimize environmental and economic effects, as shown in Table 1 below.

Table 1: Bleaching Conditions of Waste Residues

Bleach medication Drug addition amount (%) ^*           bleaching NaOH 2.0 H ₂ O ₂ 2.0           Processing conditions Bleaching Temperature: 80 ℃ pH 7.5 Bleaching Time: 60 min Bleaching Concentration: 1% (v / v)

^{* Addition} amount based on the total weight (g) of pulp fibers

Subsequently, the pulped waste residue and the small diameter material were diluted to 3% concentration as described above. In the case of the TMP manufactured using the waste residue, molding is very difficult because the bond between the fibers is very weak due to the hydrogen bond alone because of the rigidity of the thermo-based pulp itself containing a large amount of lignin. Thus, in order to assist the binding performance of the TMP fibers, cationic starch (Samyang Genex) having a degree of substitution (DS) of 0.06 was added to 0%, 10%, 20% and 30% of the total dry weight of the fiber. Starch was used after diluting to 1% after gelatinization at a temperature of about 80-85 ° C. for 20-25 minutes prior to feeding into the buffer material molding box. Starch-mixed pulp suspension was used by dissociation at 800 rpm for 1 minute using a stirrer prior to being put into the molding box of the pressure reducing apparatus. The starch-containing 3% stock was prepared by taking 1,670 mL, 2100 mL, and 3,330 mL of the total weight of about 50 g, 75 g, and 100 g into a reduced pressure molding machine, and then making a plate (square) buffer material. The buffer material was prepared by changing the decompression time in the range of 10-60 seconds (10 second intervals) to determine the change in physical properties of the buffer material according to the decompression time.

The molded buffer material is forced to blow air heated to a temperature of about 150 ℃ to the buffer material through the blower for 10 minutes to remove the excess moisture remaining in the buffer material and then the moisture content of the atmospheric state in the drying oven ( 5-8%). Since the surface of the dried buffer material was composed of fine fibers bonded by weak hydrogen bonds, it tended to detach easily in the form of a stake due to contact or friction during use. To compensate for these drawbacks, the physical properties of the buffer material were measured after three repeated surface sizing treatments on the surface of the buffer material with gelatinized 1% starch solution.

Example  2: Manufacturing conditions for the preparation of the buffer material

Waste residue manufacturing conditions for the preparation of the buffer material are summarized in Table 2 below.

Table 2: Manufacturing Conditions by Type of Waste Paper Used to Manufacture Buffer Materials]

Decompression time (sec) Cationic Starch (%) Number of surface sizing ^{2 )} NaOH, H ₂ O ₂ (%) ³⁾ Raw material ^{1 )} TMP 10, 20, 30, 40, 50, 60 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30 0, 1, 2, 3 BTMP 10 10, 20, 30 NaOH 2% H ₂ O ₂ 2% MDF 10 10, 20, 30

※ All additions (%) were based on the total weight of the raw materials.

¹⁾ TMP, BTMP, and MDF were used as raw materials.

²⁾ Surface sizing was only applied to TMP.

³⁾ Bleaching only applied to TMP.

As shown in Table 2 above, in order to determine the change in the physical properties of the buffer material according to the desorption time (suctioning time), the amount of cationic starch was fixed at 10%, and 10-60 seconds for the waste residue TMP suspension. A buffer material was prepared by varying the decompression time in the range (interval of 10 seconds).

In addition, in order to investigate the proper mixing ratio of cationic starch to the waste residue TMP and the change of the physical properties of the buffer material according to the addition of cationic starch, the amount of cationic starch was increased from 0% to 30% at 2% intervals. . When the cationic starch was added, the vacuum dehydration time was fixed at 10 seconds to prepare a buffer material under constant conditions.

In addition, since the surface of the buffer material made of waste residue TMP is composed of fine fibers bonded by weak hydrogen bonds, 1% starch solution that was gelatinized after drying to dry moisture (5-8%) using a drying oven. The surface of the buffer material was subjected to the surface sizing treatment (see FIG. 9) using a roll once, twice, and three times, and then the change of physical properties was measured and compared.

In the case hayeoteul using the waste remnant commercialized after producing a cushioning material in consideration of the effect of the bleaching process on the properties of the vibration damping materials were reacted for 1 hour in pH (7.5) after the 2% addition of NaOH and H ₂ O ₂ The whiteness and modulus of elasticity of the buffer material made of bleached TMP (BTMP) and the buffer material made of unbleached TMP were compared and analyzed. 10%, 20%, and 30% of cationic starch was added to compare the physical properties of each buffer material.

In addition, to prepare a buffer material using waste MDF as a raw material, the decompression dehydration time was fixed at 10 seconds, and 10%, 20%, and 30% of cationic starch was added for comparative analysis.

In addition, the buffer material prepared by adding cationic starch equivalent to 10% of the weight of TMP raw material was recycled up to two times in order to examine the change in physical properties according to the recycling of the buffer material. Density and modulus of elasticity were measured to determine the change in physical properties.

In addition, for the water-repellent treatment to impart water resistance to the buffer material, Alkenyl Succinic Anhydride (AKD), a reactive sizing agent, was added to 0-1.0% of the total weight of the TMP fiber to prepare a buffer material, and the contact angle was measured to measure the water repellency. The contact angle was measured using a measuring instrument (AMS-2001, Miraero System).

Experimental Example  1: Measurement of physical properties of buffer material

Drying rate, brightness, apparent density, compressive strength, restoring ratio, modulus of elasticity, and the like to measure the physical properties of the buffer material prepared according to the present invention. Porosity was measured.

Moisture evaporation rate was measured by the Ohaus company's automatic water content rate meter (MB45) connected to the hyper terminal of the PC via an RS232 cable to measure the water removal rate of the buffer material manufactured in the vacuum molding apparatus. Whiteness of the buffer material was used Brighterimeter Micro S-5 / BOC of Technidyne, USA. In order to calculate the apparent density of the buffer material, the thickness of the buffer material was measured using a vernier caliper, and then the average value of the upper and lower areas of the buffer material was calculated. Then, the apparent density was calculated by the following formula.

(1)

(One)

( W = Weight (g) of a shock-absorbing material

T = Thickness (m) of a shock-absorbing material

A _t = Area (m ² ) of a top side of a shock-absorbing material

A _b = Area (m ² ) of a bottom side of a shock-absorbing material.)

The physical property analyzer (TA-XT2i, Stable Micro Systems Ltd.) was used to measure the physical properties of the buffer material manufactured using the waste residue fibers. If the cushioning material has to have excellent buffering capacity to absorb external shocks in order to protect the packaged goods, it must have very low compressive strength. In addition, in order to maintain the buffering effect of the shock absorbing material to some extent after shock absorption, the self-resilience must be excellent, so it is necessary to have an elastic modulus within a proper range. Therefore, the items used for the physical properties analysis of the inflated material were the recovery rate, compressive strength (kgf), and modulus of elasticity (kPa). The compressive strength was measured by flat plate compression test, and the loading speed was 30 mm / min within the range of 2.530 mm / min as defined in ASAES 368.3. The formula applied to calculate the elastic modulus is as follows.

(2)

(2)

Where P = compressive strength (N), A = area (m ² ), Δl = displacement (m), and l = diameter (m). The restoring ratio of the buffer material was calculated by the following formula.

(3)

(3)

(Δ l ₁ = Distance of a load cell applied (= 5 mm)

Δ l ₂ = Distance when compressive strength is zero.)

Experimental Example  2: Calculation of porosity of buffer material

In order to calculate the porosity of the buffer material according to the present invention, the buffer material was first embedded in the buffer method as follows. For Epon 812 (Polysciences, Inc.), a type of epoxy, the curing agent is dodecenyl succinic anhydride (Polysciences, Inc.) and methyl anhydride (MNA, Methyl Nadic Anhydride, Polysciences, Inc) DMP-30 ( bis- Dimethylaminomethyl phenol, Polysciences, Inc.) is used as a curing accelerator.

A solution obtained by mixing 112 g of dodecenyl succinic anhydride in 100 g of EPON 812 and B liquid in which 75 g of methylnadic anhydride was mixed in 100 g of EPON 812 was used and mixed with each other. A large amount of liquid A softens the epoxy, while a large amount of liquid B hardens the epoxy. After the two liquids were adjusted to their mixing ratio, in order to promote the curing reaction (polymerization reaction), the accelerator DMP-30 corresponding to 1.5-2% of the two liquid mixtures was added and mixed uniformly. After the addition of the accelerator, the polymerization was allowed to proceed for 12 hours at 35 ° C., 12 hours at 45 ° C., and finally at 60 ° C. for 48 hours using a vacuum oven (you may polymerize by irradiation with UV light).

Embedded buffer material was made by using a rotating microtome (HistoSTAT-820) manufactured by Reichert, USA, and made a micro flake of about 20 μm thick, and then dyed in 1% Toludine Blue solution, and the stained flakes were subjected to Olympus optical microscope. The cross-sectional photograph was taken using (FIG. 10A, b). The cross-sectional image of the buffer material is converted to a binarized image (Fig. 10c, d) by Axiovision 4.4 image analysis program of Carl Zeiss (Germany), so that the area corresponding to the black area corresponds to voids. After calculating these areas by the program, the porosity of the buffer material was calculated. When the space other than the fiber (white part) is regarded as the void not filled with fibers as shown in FIGS. 10C and d, the porosity of the buffer material is divided from the total area by the area of the void (filled) space below We can calculate it as (4):

(4)

(4)

Where V _t -V _s = Volume of voids, V _t = Total volume.

Although the actual porosity is a volume concept, the porosity of the cross section having a thickness of 20 μm was calculated to predict the number of pores of the entire buffer material.

Experimental Example  3: Insulation test of buffer material

In order to measure the thermal conductivity of a buffer material made of thermo-mechanical pulp fibers, this study used a rapid thermal conductivity meter (QTM-500, Kyoto Electronics) and a standard probe (PD-13) with a heating wire based on ISO 8894-1,2. , Kyoto Electronics) was used to measure the thermal conductivity. The thermal conductivity meter has a measuring range of 0.013-12 W / m ° C and a reproducibility of ± 3%. The probe is 95 mm wide and 40 mm long, and the surface of the probe that is in direct contact with the surface of the sample is made of glass fiber, and a constantan hot wire having a surface width of 1 mm is attached. TMP buffer material containing 10% cationic starch was prepared for the thermal conductivity test, and the thermal conductivity was measured by precisely cutting the buffer material to a size of 100 × 50 × 20 mm so as not to form a void in the mold containing the specimen. . In addition, in order to minimize the error of the measurement result due to the temperature change around the measurement system, the room temperature was kept constant at 20-23 ℃, and the thermal conductivity was developed using the dedicated program (SOFT-QTM5EW) based on the following equation (5). Calculated.

(5)

(5)

λ : thermal conductivity (W / mK)

K , H : Probe integer

R : Electric resistance per unit length of probe heater (Ω / m)

I : heating current (A)

t ₁ , t ₂ : Time since application of current (s)

T ₁ , T ₂ : Temperature at (° C).

Experimental Example  4: Dropping test of buffer material

The main purpose of the cushioning material is to protect the product from external shocks. These shocks are mainly generated during drop impacts, and the impact force causes breakage and deterioration of the product. When the cushioning material is used as a packing material, the glass is placed inside the buffering material to measure the degree of resistance to impact during the dropping, and the freezing test during the dropping test of KS A 1011 packaged cargo is carried out using the buffering material and EPS (Expanded Polystyrene, Performance of the foamed styrofoam). In the free fall test, edge drop, side drop, and plane drop were used to observe the presence of breakage of the cushioning material and the state of the glass.

Experimental Example  5: cross-sectional shape of cushioning material

The cushioning material shall absorb the shock when it is impacted from the outside to prevent damage to the packaged goods. In order to absorb shock, the internal structure of the buffer material must have a very large porous structure, and eventually a bulky structure. In the case of a buffer material made of a mold that is currently in circulation, its structure is very regular and dense, so it is very difficult to absorb external shock (FIG. 11A). That is, the pulp mold serves as an intermediate medium through which the external impact is transmitted to the packaged product as it is. On the contrary, it can be seen that the styrofoam has pores of 98% or more to absorb external shock as shown in FIG. 11B. As shown in FIG. 11C, the buffer material manufactured from the waste residue fibers is similar to the foamed styrofoam, because unlike the cross-sectional structure of the pulp mold, the internal structure is disorderly and loosely formed and numerous voids exist.

As shown in (a) of FIG. 12, the cushioning material having a very close internal structure with the pulp mold has a structure in which the pulp mold itself does not have a structure that can absorb the impact when an external impact is applied to the pulp mold. The same force F 'as the impact F applied is transmitted to the package as it is. This results in damage to the packaged product, resulting in a loss of the original value of the packaged product. However, since the buffer material formed under reduced pressure has free spaces capable of absorbing the shock even when the shock is applied to the buffer material from the outside, most of the external shock is absorbed and removed from the inside of the buffer material as shown in FIG. Since no force F 'is transmitted to the packaged article, much less than the initially applied force F, no damage occurs to the packaged article. Therefore, the cushioning material serves to protect the packaged product from external impact.

Experimental Example  6: Change of Physical Properties of Buffer Material with Vacuum Dehydration Time

     In the manufacture of a flat buffer material, a 3% concentration of pulp suspension is placed in a forming box, followed by depressurization, and drainage is performed. As the moisture contained in the pulp suspension is removed through the reduced pressure, drying time after molding can be reduced, which contributes to lowering the manufacturing cost of the buffer material. In the case of TMP manufactured from waste residues, it could be confirmed that even if the decompression dehydration time increases, the physical properties of the buffer material are hardly affected when the dehydration time increases. Therefore, careful attention is required because it is part of a very important process that is closely related to decompression time and manufacturing cost.

In order for the cushioning material to have effective impact resistance, the amount of fibers present in a certain volume should be as small as possible. If the density of the buffer material is lowered to have an appropriate impact resistance, the amount of waste paper fibers constituting the tissue of the buffer material is also reduced, which in turn contributes to a reduction in manufacturing cost. Therefore, the drying time and density of the buffer material are very important factors in evaluating the economics of the buffer material.

The most important factors in evaluating the function as a buffer material in physical terms are the elastic modulus (kPa) and density (g / cm ³ ) of the buffer material. Table 3 shows the elastic modulus and apparent density according to the decompression time by adding 10% of the amount of cationic starch required to maintain the shape of the buffer material when molding TMP made from waste residue. The change of is compared with the values of styrofoam and pulp mold. Figure 13 shows the change in the apparent density of the buffer material with a change in the decompression time of the pressure reducing machine compared with the values of the pulp mold and styrofoam based on the results shown in Table 3.

Table 3: Changes in Physical Properties of Buffer Materials with Vacuum Time

When manufacturing the buffer material, it is important to maintain the bulky state of the buffer material by using less waste residue fiber under short decompression dehydration time in consideration of economic aspects. As can be seen in FIG. 13, the apparent density of the buffer material increased as the decompression time increased, but did not show a large increase after 30 seconds. This is because the TMP fibers constituting the buffer material contain a large amount of lignin on the surface, and thus, due to the rigidity of these fibers themselves, there is little tendency for the fibers to be dense at a density above the critical level. I think I can. That is, under low vacuum, Campbell's force is not applied between the fibers containing a large amount of lignin, and thus, the internal structure of the buffer material is almost eliminated. Therefore, it was judged that a decompression time of 30 seconds or less was appropriate when preparing a buffer material from TMP fibers.

In addition, the density of the foamed styrofoam is about 0.03 g / cm ^{3 It} is about 10 times smaller than the 0.3 g / cm ³ of the pulp mold. On the other hand, the buffer material made of waste residue TMP has a density of 0.08-0.12 g / cm ^{3 with} the change of decompression time, which is about 2-4 times larger than the density of styrofoam but much smaller than the pulp mold. Is manufactured. Considering that the manufacturing method of the TMP buffer material is different from the manufacturing principle of the foamed styrofoam, it can be easily inferred that the apparent density of the TMP buffer material is formed to be very low. In the case of the pulp mold, the densification of the fibers during the pressure reduction process during the manufacturing process significantly increased the density of the pulp mold. On the other hand, since the compression process is omitted in the decompression step, the TMP buffer material is formed in a state where the densification of the fibers is hardly performed. In addition, TMP fibers used as raw materials are very inflexible compared to bleached fibers because they are used with little lignin removed. The more rigid the fiber is, the more loose the inter-fiber bonding force is, and the buffer material made of such rigid fiber has a porous internal structure that can absorb the impact when an impact is applied from the outside.

14 is a graph showing the elastic modulus of the buffer material made of waste residue TMP compared with the elastic modulus of styrofoam. Too high an elastic modulus in evaluating the buffering performance may result in a breakage of the packaged article because it means that a force for transferring an external impact toward the packaged article is increased. Therefore, in order to be used as a cushioning material, it is advantageous to have a low modulus of elasticity if possible. Contrary to the results of the apparent density, the elastic modulus of the buffer material increased continuously as the decompression dehydration time increased. Increasing the depressurization time did not have a significant effect on the density increase of the buffer material, but it seemed to contribute to increase the modulus of elasticity by increasing the bonding force between the starch and the fibers added as a binding aid.

In addition, the elastic modulus of the styrofoam (computer case) was about 941 kPa, which was higher than that of the buffer material made of TMP regardless of the decompression dehydration time. Compared to the elastic modulus of the pulp mold (about 1768 kPa), the TMP buffer material showed a much smaller value. This means that the buffer material made of waste residue TMP has better buffering performance than pulp mold or styrofoam. As mentioned above, in the case of the buffer material made of waste residue TMP, since the TMP itself is made of rigid fiber containing a large amount of lignin, Campbell force required for bonding between fibers during a short depressurization time of rough vacuum ( Campbell force may not be strong. Therefore, a buffer material with loose connective tissue was made, and it seems that a buffer material having a lower elastic modulus than styrofoam was made. However, if the elastic modulus of the cushioning material is too low, the structure itself of the cushioning material is destroyed by an external impact, which is very likely to cause damage to the packaged goods. Therefore, it is necessary to apply a reduced pressure dehydration time of about 30 seconds if there is no significant change in density because the molding must be made to have an internal structure that maintains a minimum elastic modulus.

In the change of elastic modulus of the buffer material with decompression time, decompression dehydration time was the most ideal elastic modulus. However, considering the economical dehydration time in terms of reducing the drying cost by decompression dehydration, 30 seconds of decompression dehydration time would be most suitable. Therefore, increasing the decompression dehydration time does not cause an increase in apparent density or elastic modulus after a certain period of time, so increasing the decompression time only increases the power consumption in terms of the drying cost of the buffered material by dehydration, but does not reduce the actual drying cost. Can't.

Buffer material made of waste residue TMP is considered to be the most important part because of the rigidity of the raw material itself, and the determination of the amount of binding aid added to maintain shape together with depressurization dehydration of appropriate time.

Experimental Example  7: according to starch Waste residue TMP , BTMP  And MDF  Change of physical properties of buffer material

Starch is one of the longest and most widely used dry-strength additives in the paper industry. Natural starch, like fibers, has negative ions, so its retention efficiency is very low, so its use is rapidly declining. Therefore, the necessity of a new modified starch having a cationic group introduced into the starch has emerged strongly, and cationic starch has been developed as an alternative. Cationic starch is prepared by using an epoxy-based chemical having a quaternary ammonium group and causing an etherification reaction at elevated pH and temperature. When the cationic starch is introduced into the fiber suspension, the cationic starch molecules are settled between the fibers to promote interfiber bonding, thereby improving the strength of the paper.

Unlike general papers, the buffer material is manufactured in a bulky state, and thus the bonding between neighboring fibers is very weak. If the buffer material is manufactured in such a state, the buffering performance can be expected to be significantly improved, but the probability that the shape of the buffer material is easily destroyed is very high. Therefore, in order to improve such a part, it is necessary to add a dry strength increasing agent to improve hydrogen bonding between fibers. However, the addition of more than an appropriate dry strength enhancer promotes excessive consolidation of the buffer material tissues, leading to loss of buffering performance. Therefore, it is necessary to study to determine the proper addition level, and to investigate the change of physical properties of the buffer material according to the amount of cationic starch.

The buffer material prepared from the waste residue TMP was significantly lower in whiteness by lignin chromophores, and the BMP was treated with NaOH and H ₂ O ₂ for the purpose of improving whiteness. 10%, 20%, and 20% for each buffer material to compare the physical properties of the buffer material made of bleached thermomechanical pulp (BMP) treated with bleached thermomechanical pulp for the purpose of improving whiteness, and the buffer material prepared from conventional unbleached TMP. 30% cationic starch was added to investigate the change in physical properties.

In addition, MDF was used to find ways to recycle medium density fiberboard, which takes up most of the domestically produced fiberboard. MDF produced in Korea refers to wood plate products whose raw materials are wood fiber and other vegetable fibrous materials, which are prepared by adding them to thermosetting resin adhesives or by mixing other adhesive materials. Therefore, since TMP prepared by dissolving the waste residue material is similar to the raw material composition, it was judged that it could be sufficiently used as a buffer material. TMP-like fibrous raw materials were prepared by using a blender to recycle waste MDF. In addition, when the buffer material was prepared from waste MDF and waste TMP, 10%, 20%, and 30% of cationic starch was added to the total dry weight of the seaweed for each buffer material.

Table 4 shows the apparent density and modulus of elasticity of the buffer material prepared from waste residue TMP, BTMP, and waste MDF by using cationic starch as a binding aid compared to styrofoam.

Table 4: Changes in Physical Properties of Buffered Materials According to Starch Addition

15 is a graph showing the change in the apparent density of the buffer material according to the addition amount of the cationic starch based on the values shown in Table 4. Regardless of the type of raw materials, the apparent density increased little by little as the amount of cationic starch increased. It is believed that cationic starch contributed to the increase in density by increasing the hydrogen bonds between the fibers. Among MDF, TMP and BTMP, the buffer material made of MDF showed the highest density value, and the buffer material made of TMP showed the lowest density value. MDF fibers have a large amount of undissociated bundling fibers among dry fibers dissociated due to the effect of the thermosetting resin contained in the raw materials and the thermosetting resin contained in the raw material and the adhesiveness of these resins. These binding fibers appear to be retained inside the fiber network, increasing the apparent density of the buffer material. Therefore, in order to recycle the MDF to manufacture the buffer material, a process of first removing a synthetic resin such as urea resin or phenol resin added as an adhesive may cause an increase in manufacturing cost. Therefore, it was judged that recycling waste MDF was not desirable when preparing buffer materials.

In the case of the buffer material made of BTMP, the lignin was removed in the bleaching step of the BTMP fibers to increase the apparent density by increasing the binding strength with the flexibility of the fiber, and eventually the apparent density of the buffer material made of the BTMP was made of TMP. Compared to the apparent density of, it increased slightly regardless of the amount of starch added. However, it is considered that the use of unbleached pulp is more desirable because the rate of rise is very small and the environment-friendly buffer material is manufactured using bleaching chemicals from an environmentally friendly point of view.

The apparent densities of buffer materials made of BTMP, TMP and waste MDF were higher than those of foamed styrofoam. The apparent density of the buffer material made of waste MDF is about 6 times higher than that of styrofoam. When used as a packing buffer under high density, there is a high possibility of raising the logistics cost by increasing the total weight of the box. . On the contrary, the buffer material made of TMP showed about 3 times higher density than styrofoam, but the density of the buffer material was less than 0.1 g / cm ³ . Therefore, it was confirmed that the buffer material made of unbleached TMP fibers can be used as an environmentally friendly buffer material that can replace foamed styrofoam, which is about 2-3 times the density of styrofoam, but is a hardly decomposable packaging buffer.

16 is a graph showing the change in the elastic modulus of the buffer material according to the addition amount of the cationic starch based on the values shown in Table 4. The dehydration time for the buffer material upon addition of cationic starch was fixed at 10 seconds for optimal cost. In the case of the buffer material made of BTMP, the elastic modulus value was the smallest when 10% of the cationic starch was added, and the modulus was lower than that of MDF or TMP even though the amount of starch was increased. The buffer material made from waste MDF showed the highest modulus of elasticity regardless of the amount of cationic starch added, especially higher than that of foamed styrofoam. One thing to note here is that when the cationic starch is added 10% to unbleached TMP, the modulus of elasticity is about 3 times lower than that of styrofoam. If the modulus of elasticity is too low, the shock absorbing material may be destroyed when impacted from the outside, which may cause damage to the packaged product. Therefore, it is necessary to maintain the elastic modulus more than the appropriate level by adding a predetermined amount or more cationic starch. From the results of FIG. 17, it may be desirable to maintain the elastic modulus of the buffer material itself through the addition of cationic starch, considering that the purchase price of cationic starch (about 3000 won / kg) is not so high.

When the TMP fiber suspension is placed in a forming box and subjected to dehydration under reduced pressure, excess water (free water) contained in the fiber suspension is discharged to the drain pipe by vacuum. The amount of water remaining in the buffer material formed into a thick plate-like shape after dehydration under reduced pressure greatly affects the drying speed of the buffer material. Therefore, if possible, the amount of water remaining inside the buffer material after dehydration under reduced pressure should be small. Table 5 and FIG. 17 are graphs of the amount of water remaining in the buffer material immediately before drying when the amount of starch added is different by using an MS45 Moisture Analyzer. Regardless of the number of repetitions of the residual moisture content measurement experiments, the amount of water remaining in the buffer material decreased as the amount of added starch increased. If the starch is added in excess of 20% of the total weight of the fiber, the hydroxyl groups (-OH) of the cellulose molecules of the pulp fibers may bind to the hydroxyl groups of the starch molecules before binding to the water, thereby allowing the fiber molecules to bind with the water. Reduces the chance of being In addition, starch molecules agglomerate fine fibers with high binding capacity (high specific surface area) to reduce the bonding area with water molecules, and at the same time reduce the number of voids formed in the internal structure of the buffer material to free water. Less space is available. For this reason, it is thought that the amount of water remaining in the buffer material decreases as more starch molecules are added.

[Table 5: Changes in Water Content of Buffer Materials According to Starch Addition]

Experimental Example  8: Change of Physical Properties of Buffer Material According to Change of Raw Material Input

Considering the economic aspects of buffer material manufacturing, the first priority is to maximize the cost of the buffer material while minimizing the input of raw materials. Therefore, based on the results of the measurement of apparent density and modulus of elasticity, the cationic starch as a binding aid is fixed at 10% and decompression dehydration time is fixed at 10 sec. It was.

Table 6 shows the results of measuring physical properties after the buffer material was prepared by adjusting the dosage of TMP raw materials to 50 g, 75 g, and 100 g. 18 is a graph showing the change in the apparent density of the buffer material according to the input amount of the raw material based on the values shown in Table 6.

[Table 6: Change of Physical Properties of Buffered Material According to Raw Material Input Change]

As shown in FIG. 18, the apparent airtightness of the buffer material prepared by varying the amount of TMP fibers was not significantly different. However, as the amount of added starch increased, the apparent density of the buffer material made of 100 g of TMP increased slowly. As the fiber solids content increases, the probability that the starch and the fibers can be bonded to each other increases, resulting in an increase in density due to the increase in the bonds between the fibers. In conclusion, when the solid content of the buffer material is less than a certain level (100 g) it was confirmed that the difference in density according to the fiber and starch addition amount does not appear significantly.

Figure 19 shows the change in the elastic modulus of the buffer material when the weight of the fiber input during the manufacture of the buffer material. Unlike the results of apparent density, the difference of elastic modulus according to the weight change of the injected fiber was obvious. The modulus of elasticity increased as fiber input and starch content increased. When the solid content is added to make the buffer material having a certain area and thickness, the amount of solid content added increases the force (that is, the elastic modulus) to resist deformation due to external impact (force). Therefore, the buffer material made from 100 g of fiber shows the largest modulus of elasticity. However, compared to the elastic modulus of styrofoam, it is still low, and there is a limit to the method of increasing the physical properties of the buffer material by adding a bonding aid such as starch. Therefore, it was determined that a method of improving the bonding strength of the fiber itself by applying a physical treatment such as refining to the fiber itself rather than the method of increasing the elastic modulus by adding the subsidiary materials.

However, the elastic modulus of the buffer material increased as the amount of added starch increased regardless of the weight of the solid, but the increase was not large except for the buffer material made of 100 g of fiber. In order to further increase the modulus of elasticity according to the addition of starch, it was confirmed that the weight of the fiber solid content needs to be higher.

Note that in the apparent density graph of FIG. 18 and the elastic modulus graph of FIG. 19, the change in the apparent density and elastic modulus according to the amount of cationic starch decreases as the amount of raw material is decreased. Judging from these results, it would be very advantageous to reduce the amount of raw material in terms of economics or physical properties of the buffer material.However, if the amount of raw material is less than 75 g, the shape of the buffer material may be maintained due to the inherent characteristics of the TMP fiber. Has shown a serious problem that it is very difficult. This is because unbleached TMP fibers contain a large amount of lignin, and thus the fiber binding force is very weak, so it is very difficult to form a buffer material with only a small amount of TMP fibers. Therefore, mechanical pretreatment such as refining was needed to reduce the amount of solids constituting the buffer material.

Experimental Example  9: buffer material Surface sizing  Property change after treatment

The cushioning material shall absorb the shock when it is impacted from the outside to prevent damage to the packaged goods. To absorb shocks, the internal structure of the cushioning material must have a porous structure, and eventually a low density structure. However, if the density is lowered due to the porous structure, it is more difficult to maintain the shape of the buffer material. This may be caused by the reduction of the bonding area, which is a problem that occurs when the input of the buffer material is reduced earlier, but the biggest problem is that the external impact may cause deformation of the shape when the shock exceeds the internal bonding force of the buffer material. will be. Therefore, when manufacturing the buffer material, it is necessary to perform a surface sizing treatment on the surface of the buffer material after the drying process in order to improve the quality of the buffer material and minimize deformation due to external impact. In addition, since the surface of the dried buffer material is composed of fine fibers bonded by weak hydrogen bonds, it tends to detach due to contact or friction during use. To compensate for this drawback, the surface of the buffer material was sized with 1% starch solution.

In the preparation of the buffer material, the quality of the final buffer material depends greatly on the characteristics of the surface sizing agent and the surface properties of the buffer material. Depending on the surface properties and absorption characteristics of the buffer material, the penetration of the surface size agent into the buffer material and the degree of passivation vary greatly. Since the surface properties of the buffer material may change depending on the degree of dehydration and drying process, the surface sizing treatment is necessary to minimize the surface variation. Even in the case of actual paper, the surface structure and absorption characteristics can be effectively changed by using various surface sizing agents, and when the surface residualness among the surface sizing agents is large, it is reported to improve the glossiness and surface coating property of the paper surface. There is a bar.

Previously, the coating chemicals for surface sizing used many starch oxides with easy gelatinization and excellent geological stability. However, due to the disadvantage that the starch liquid penetrates deeply into the surface, it is currently interested in the technology of surface sizing using cationic starch. Are gathering. When the surface sizing using cationic starch occurs less penetration of starch and very high surface residuals can be expected to improve the opacity and various optical properties. However, the cationic starch also has a different effect depending on the application conditions, and in particular, the surface structure of the buffer material expressed by the anion remaining on the surface of the material and the cationic properties of the cationic starch may be formed differently.

The surface sizing treatment of the buffer material is carried out once, twice, and three times by using a roller on the back surface of the buffer material with respect to the buffer material (100 g of dry condition) made of waste TMP. Was compared. The surface coating amount of the cationic starch was about 3.6 g / m ² on both sides.

Table 7 shows the result of measuring the physical properties of the buffer material after the surface sizing treatment. 20 is a graph showing the apparent density change based on the values shown in Table 7, and FIG. 21 is a graph showing the change of the elastic modulus.

As shown in FIG. 20, the difference in apparent density was remarkable regardless of the number of surface sizing treatments, and the surface sizing treatment increased the apparent density according to the change in the amount of cationic starch, but the increase was not large. This is because cationic starch forms a coated layer on the surface pores after the first surface sizing treatment on the surface of the buffer material, and since the surface penetration of the starch through the surface pores becomes difficult after the second surface sizing, a thin film It is judged that the change of the apparent density is reduced by forming). In addition, when surface sizing treatment was performed on the surface of the buffer material in which the cationic starch was added to the fiber suspension, the affinity between the starch molecules appeared to improve the apparent density. However, even if the amount of starch added to the fiber suspension was increased, the apparent density increase effect by the surface sizing treatment was not so large except for one time (No. 1 coating). This is presumably because the surface film formed by the primary surface sizing, as mentioned above, prevented the penetration of the subsequently processed starch molecules.

[Table 7: Change of Physical Properties of Buffer Material According to Number of Surface Sizing]

As shown in Figure 21 shows the change in the elastic modulus of the buffer material according to the surface sizing treatment and the addition amount of the cationic starch. The modulus of elasticity increased as the surface sizing was repeated, but did not show a significant difference as seen in the apparent density results of FIG. 20. However, as the amount of cationic starch was increased regardless of the number of surface sizing treatments, the modulus of elasticity of the buffer material was increased so that the effect of starch addition was very excellent. As mentioned above, the bond between the embedded starch molecules and the starches used for the surface sizing increases the elastic modulus of the buffer material. It is generally known that applying a surface sizing treatment improves the stiffness of the material and reduces the liquid absorbency. The surface sizing of the buffer material prevents the buffer material from being easily destroyed by the external impact and causes deformation of the packaged product, and absorbs moisture in the air to prevent deterioration of the physical properties of the buffer material. In addition, the effect of starch added to the buffer material appeared to have a positive effect so that it can be efficiently expressed.

In conclusion, in the case of the packing cushion material, the ability to absorb shock is the most important part, but if the shock absorbing material is deformed by external shock and damages to the goods inside, the value of the packing cushion material is of no value. Therefore, it was confirmed that the surface sizing is very advantageous to minimize the change in the elastic modulus of the buffer material and to improve the physical properties of the buffer material itself. In particular, the buffer material with 10% cationic starch added to the total dry weight of the fiber raw material was found to be the most useful addition ratio since the elastic modulus as well as the apparent density change could be minimized during the one-time surface sizing treatment.

22A and 22B are photographed through an Olympus (SZ61, Japan) stereo microscope before and after the surface sizing process, that is, before the cationic starch forms the film film and after the film film is formed on the buffer material. As shown in the micrographs, it is easy to observe the difference in the surface structure of the buffer material before and after the surface sizing treatment. The surface structure of the surface-sized buffer material became more dense as the starch particles were coated and many of the pores observed on the surface disappeared. The surface sizing may not only prevent the fibers from detaching from the surface of the buffer material, but also may have an effect of preventing the shape of the buffer material from being destroyed by external friction or impact.

Experimental Example  10: Pressing  Change of Porosity of Buffer Material by Process

The buffering performance of the buffer material is closely related to the structure of the internal structure of the buffer material. The internal structure of the foamed styrofoam serves to absorb external shocks by the huge voids formed by the expansion of unit beads constituting the styrofoam. Therefore, it may be desirable to form a porous structure of the internal structure even when the buffer material is processed by processing TMP fibers made of waste residue or small hardwood.

Table 8 shows the results after calculating the porosity of the pulp mold used in the TMP buffer material and commercially available by varying the amount of cationic starch. FIG. 23 is a graph showing the change in porosity according to the change in the amount of cationic starch compared to the pulp mold and styrofoam. It is shown that the porosity of the buffer material does not show a significant difference even if the amount of cationic starch added during the preparation of the buffer material is different. This result can be found in the fact that the density of the buffer material does not change significantly even if the amount of cationic starch is increased as shown in the apparent density results of FIG. 18. This means that the addition of cationic starch to the buffer material consisting of TMP fibers contributes to the improvement of the inter-fiber adhesion but does not significantly affect the densification of the tissue. As discussed above, the increase of the modulus of elasticity when the amount of cationic starch is increased is related to the improvement of the bonding force (FIG. 19). Reference).

Table 8: Variation of Porosity of Buffer Material According to Starch Addition

One interesting fact is the difference in porosity between pulp molds and TMP buffer materials. Although the porosity of the TMP buffer material was smaller than that of styrofoam, it was about three times larger than the porosity of the pulp mold. In view of these differences, it is easy to confirm that the buffering performance of the buffer material, that is, the impact resistance, is much better than that of the pulp mold. Therefore, the porosity results proved that the buffer material made from waste fiber has an excellent buffering capacity to replace styrofoam.

In addition, if the porosity is high, the dehydration rate is increased even when depressurized and dewatered, which contributes to the reduction of the drying cost. If there are many voids inside the tissue of the buffer material, the movement speed of the water is increased when dehydration under reduced pressure, so that a large amount of water can be removed even with a short time of decompression. Since the manufacturing cost of the buffer material can be lowered by shortening the drying time, the void formation of the buffer material is a key factor in the manufacturing process of the buffer material in terms of physical and economic aspects.

Experimental Example  11: Internal Sizing  According to treatment TMP  Water Resistance Change of Buffer Material

     Table 9 and Figure 24 shows the change in the contact angle of the buffer material when the buffer material was prepared by adding AKD, an internal addition size agent, together with the TMP raw material. The contact angle of the AKD-added buffer material showed the largest 103.72 ° with AKD 0.4%, and the contact angle of 83-92 °. When the cushioning material has a contact angle of 80 ° or more, the buffer material has a degree of water resistance, and when used for the buffering of a watery packaged product, it is possible to protect the packaged product during distribution without easily losing the buffering performance by moisture. do. The contact angle of EPS was 84.2 °, which was lower than that of AKD-treated TMP buffer material.

However, when the surface of the TMP buffer material was subjected to surface sizing with starch solution, the water absorption capacity of the starch increased, and the contact angle was sharply reduced compared to the buffer material without surface sizing treatment. However, the surface-sized TMP buffer material has a much larger contact angle compared to the contact angle (3.2 °) of liner paper made of kraft paper. That is, the buffer material made of TMP fiber containing a considerable amount of lignin shows a certain degree of water resistance by itself, but if the surface size is treated with a polymer having a hydrophilic hydroxyl group (-OH) such as starch, the water resistance of the buffer material It will act as a drop. Therefore, in order to manufacture a buffer material requiring high water repellency, it is necessary to use a biodegradable polymer showing water repellency when surface sizing.

[ Table 9: Change of Contact Angle According to AKD Input]

Experimental Example  12: Changes in Physical Properties According to the Number of Recycled Buffer Materials

     Unlike foamed styrofoam, one of the advantages of TMP buffer materials is that they can be recycled after use. The wood fibers that make up the tributary are recycled repeatedly, resulting in repeated hornification of the fibers, which dramatically degrades the quality of the paper. In addition, as the curling (curling) of the fiber according to the recycling is rapidly reduced the bonding strength of the individual fibers. Reducing the binding force of the fiber will leave a large number of voids in the interior of the buffer material will contribute to improving the buffer performance of the buffer material.

Table 10 and FIG. 25 show the change in apparent density of the buffer material with the amount of cationic starch added. As expected, it is easy to observe that the apparent density of the buffer material decreases as the buffer material is repeatedly recycled, and starch addition improves the binding force of the fibers constituting the buffer material, so that the apparent appearance of the buffer material is independent of the number of recycling cycles. Contributed to the increase in density. However, repeated recycling reduces the density of the buffer material, which creates a lot of free space inside the buffer tissue. These glass spaces make it easy for the cushioning material to absorb the external impacts applied to the packaging box to prevent damage to the packaged article. In conclusion, if the recycled TMP buffer material is recycled repeatedly, it will not reduce the buffering performance of the buffer material but rather improve the TMP buffer material to be recognized as an environmentally friendly material.

[Table 10: Apparent Density Variation with Starch Dose and Number of Recycles]

Table 11 and FIG. 26 show the change in the elastic modulus of the buffer material according to the amount of cationic starch when the buffer material was made again using the TMP buffer material as a raw material. As seen in the change in apparent density according to the number of recycling, the elastic modulus of the buffer material was drastically decreased as the TMP buffer material was recycled, and the addition of excess starch did not significantly affect the elastic modulus. Recycling the TMP buffer material promotes keratinization and curling of the fiber, which greatly reduces the interfiber bonding, thereby reducing the elastic modulus of the buffer material. In particular, TMP fibers have a very small binding force due to the chemical properties of the lignin containing a large amount. The addition of starch, a binding aid, did not contribute much to the improvement of the physical properties of the entire buffer material, while remaining at a level that complements the fiber binding force due to recycling. Therefore, it was judged that it is not necessary to add excessive amount of starch as a binding aid when the buffer material is prepared from recycled TMP fibers.

[ Table 11: Change of modulus of elasticity according to starch input and regeneration times]

Table 12 and FIG. 27 show the degree of change in porosity inside the buffer material with the amount of cationic starch added as the TMP buffer material is recycled. As expected from the results of apparent density, it is easy to see that the porosity increased as the TMP buffer material was recycled repeatedly, compared to the case where the recycling was never performed. As the bond strength of the fiber becomes weak, a loose structure is formed inside, which leaves many voids in the internal structure of the buffer material. These voids will play an important role in the cushioning material to absorb external shocks.

As can be seen in Figure 27, the porosity of the buffer material does not increase by the number of times the buffer material is recycled. The porosity at the time of recycling once and the porosity at the time of recycling twice did not show a big difference. As soon as the buffer material is recycled, the fiber starts to deteriorate and affects the bond strength of the fiber, resulting in a decrease in the density of the buffer material and a decrease in the porosity, but even if recycling is repeated, it does not lead to an increase in the porosity due to the continuous fiber deterioration. In other words, the repeated recycling treatment only loosened the internal structure of the buffer material and did not significantly affect the porosity. However, the improvement in the porosity of the buffer material as compared to the non-recycled treatment is one of the very advantageous characteristics in terms of the expression of buffering efficacy. Another interesting fact is that the addition of cationic starch did not significantly affect the porosity of the buffer material regardless of the number of recycles. Therefore, it was determined that cationic starch should be added at around 10%.

[Table 12: Variation of Porosity According to Recycling of Buffer Material]

Experimental Example  13: Change of whiteness of buffer material before and after bleaching

     The use of TMP (Thermomechanical Pulp) for waste pulp or small hardwood has the advantages of higher yield and less pollution than chemical pulping, but it has strength problems. TMP is an advanced mechanical pulping method that is representative of refiner mechanical pulp, which is characterized by steam treatment of raw material before and during sea island. Therefore, the pulping of waste residue, which is a raw material of the buffer material, softens the chip by steam treatment, and introduced TMP with more long fiber content and less binding fiber than general mechanical pulp. However, TMP has the disadvantage that the pulp's brightness is reduced and bleaching efficiency is considerably reduced by thermochemical action by high temperature heat treatment performed before refining.

Foam styrofoam, the most widely used packaging cushioning material, is white in color, and consumers using the cushioning material have a recognized recognition that the packaging buffer should be white. Of course, it is necessary to improve the misperception that the packaging buffer material should be white through media such as newspapers or broadcasts, and in addition, it should be promoted that the stereotype of color should be changed in consideration of environmental aspects.

The buffer material made of TMP fiber is brown because it contains a large amount of lignin. The purpose of this study was to investigate how the buffering performance of the buffer material changed when bleached to change the color of brown to the light color system preferred by consumers. In general, bleaching of mechanical pulp is usually performed by lignin preservation bleaching to maintain high yield even after bleaching. Hydrogen peroxide (H2O2) is mainly used as a bleach. However, hydrogen peroxide bleaching is less expensive to bleach but has a lower whiteness rise. Therefore, TMP, a raw material of the buffer material, was subjected to a two-stage bleaching treatment of sodium hydroxide (NaOH) together with hydrogen peroxide. The concentration of the bleaching agent was added 2% to the total weight of the raw materials, respectively, and the reaction time was bleached under the conditions of 1 hour and pH 7.5.

Table 13 summarizes the results of measuring the whiteness of the buffer material prepared from MDF as a raw material and the TMP buffer material before and after bleaching. The whiteness of the buffer material was measured using Brighterimeter Micro S-5 / BOC of Technidyne, USA.

28 is a graph showing the change in the whiteness of the buffer material based on the values shown in Table 13. When buffer materials were prepared from BTMP fibers bleached with TMP fibers, BTMP buffer materials showed much higher whiteness than TMP and MDF buffer materials. BTMP buffer material showed little whiteness variation with increasing starch amount. However, the whiteness of MDF and TMP buffers increased with increasing starch content, which was thought to affect the increase of whiteness due to the addition of starch of white powder.

In conclusion, white buffer system can be manufactured through bleaching when buffer material is manufactured by pulping waste residue or small diameter material, but manufacturing cost due to waste water treatment cost and additional bleaching cost due to the use of bleaching chemicals It was judged that it would be desirable to avoid the bleaching process, as this could lead to an increase in. In addition, it is considered that bleaching is not desirable because there is a possibility of water pollution problem caused by bleaching from the environmental point of view. It is necessary to recognize that philosophical thinking about the environment is more necessary than the aesthetic sense that consumers feel.

[ Table 13: Change of Whiteness of Buffer Material by Bleaching of Raw Material]

Experimental Example  14: Evaluation of thermal insulation of cushioning material

     The packaged goods are packaged with a cushioning material in a cardboard box and then exposed to external temperature changes when distributed. In order to preserve the original value of the packaged goods, it is most desirable not to be exposed to temperatures corresponding to harsh conditions, but otherwise, some degree of insulation should be provided by the cushioning material. Therefore, the thermal insulation properties of the buffer material made of TMP fibers were evaluated to analyze how much the buffer material can block external heat.

In general, the thermal conductivity must be less than 0.1 W / m · K to be used as the insulation. Therefore, it is known that the smaller the thermal conductivity value, the better the thermal insulation property. EPS, which is a foamable insulation, exhibited a thermal conductivity of about 0.04 W / m · K, which is more than twice as high as that of the pulp mold. In contrast, the TMP buffer material had a thermal conductivity of about 0.05 W / m · K, which was slightly higher than that of EPS. The TMP buffer material appears to have excellent thermal insulation because it forms a porous structure with numerous pores inside the tissue, and the intracellular lumen of each fiber itself is not collapsed and remains open. Increasing the amount of starch as a binding aid to the buffer material increased the bonding strength between the fibers, the heat transfer rate was increased and eventually reduced the thermal insulation effect (see Fig. 29).

In conclusion, TMP buffer material can be used as an excellent eco-friendly material having not only a buffering effect but also a thermal insulation effect like the EPS buffer material, if the amount of binding aid is adjusted when preparing the buffer material with TMP pulp.

[Table 14: Comparison of Thermal Conductivity According to Starch Dose with Other Buffer Materials]

Table 15 and Figure 30 show the change in thermal conductivity when the surface sizing treatment of the TMP buffer material surface with starch. Sizing the surface of the buffer material fills the voids on the surface and increases the density, resulting in faster heat transfer. As shown in FIG. 30, it can be easily seen that the surface-sized buffer material has a lower thermal conductivity than the untreated buffer material. As the amount of added starch was increased, the thermal conductivity of the surface-sized buffer material was slightly decreased, but there was no significant difference compared to the non-sized surface material.

Table 15: Thermal conductivity change of TMP buffer material by surface sizing

Experimental Example  15: Dropping test of cushioning material

     A fragile glass was placed inside the buffer material, and corner drop, drop test, and plane drop test were conducted according to KS A 1011. FIG. 31 shows the results of observing the cracked state of the buffer material and the state of the inner glass after dropping the buffer material made of TMP and EPS in the corner direction. When the buffer material made of TMP fell to the edge, weak deformation began to occur from the edge. When repeated three or more drops, part of the tissue constituting the buffer material was lost, and the drop was about 1.8 cm when dropped ten times. Deformation occurred. However, irrespective of the tissue deformation of the buffer material at the impacted site, no damage occurred to the glass in the buffer material, and thus the shock absorbing performance of the buffer material was excellent. In the case of EPS, deformation of 3 mm occurred from the first drop test, and after 10 drops, the deformation area was greatly enlarged to 1.6 cm, resulting in severe tissue deformation. In conclusion, in the repeated edge drop test, both the TMP buffer material and the EPS buffer material showed a weak tendency when the shock was transmitted in the corner direction due to deformation of the edge tissue.

FIG. 32 shows the results of observing the state of the buffer material and the glass when the buffer material made of TMP and EPS dropped to the side. In the case of the TMP buffer material, when the drop was repeated, smaller but smaller deformation occurred than the edge drop, and in particular, a small crack began to occur at the center of the surface of the buffer material. However, despite 10 times of repeated drop impacts, the central crack did not proceed to the internal structure of the buffer material, and the glass was kept in its original form because the impact was not transmitted to the glass packaged inside the buffer material. . Therefore, even if the impact was applied to the side of the buffer material made of TMP, although weak deformation occurs at the external tissue site and surface, the glass was protected by being absorbed and removed before the impact was transferred to the inside. In the case of EPS buffer material, no deformation occurred in the external tissues even after the drop test up to 5th, but deformation of about 5 mm occurred after 10 excessive drop tests. The results show that the EPS buffer material is more resistant to deformation than the impact delivered to the side of the TMP buffer material.

FIG. 33 shows the results of observing the damage of the buffer material and the glass when the buffer material made of TMP and EPS falls to the plane. When the TMP buffer material was dropped to the 5th, the buffer material itself was not damaged at all, and the glass packaged inside was well preserved. However, in the case of dropping the shock absorbing material up to 10 times, the shape of the shock absorbing material was slightly distorted, but there was no deformation in the overall appearance and no damage to the glass. In the case of the buffer material made of EPS, no deformation occurred in the outer structure of the buffer material despite the drop test of up to 10 times. In the case of the planar drop test, both the TMP buffer material and the EPS buffer material were very resistant to impact, which not only preserved the structure of the buffer material itself but also securely protected the packaged goods.

On the other hand, while the present invention has been shown and described with respect to certain preferred embodiments, the invention is variously modified and modified without departing from the technical features or fields of the invention provided by the claims below It will be apparent to those skilled in the art that such changes can be made.

As described above, the present invention is not to use styrofoam or waste paper as in the prior art, but to manufacture a buffer material using waste residues or small diameter materials generated during processing of forests or wood as a base material. Before the pulping of the remnants or the small hardwoods by disintergating, the process is performed through a cooking apparatus heated in the range of 120 to 140 ° C. According to the present invention by prior to the process of cooking by hot air before pulping by further softening the wood of the waste residues or small diameter wood, there is an effect that can be easily and excellent pulping through the sea island.

In addition, when mixing the hot-pulverized thermopulled pulp (TMP) pulped with a cooking apparatus and a sear as described above with starch, 75-100 g of the thermomelted pulp (TMP) compared to the weight of the thermosetting pulp (TMP). By mixing with starch in the range of 10 to 30%, it is sufficient to maintain a constant shape of the buffer material while minimizing the change in the apparent density and modulus of elasticity can significantly increase the buffer performance.

Furthermore, the waste wood buffer material produced by the above method has a density within the range of 0.08 ~ 0.12g / cm ³ according to the change in the decompression time, which is significantly smaller than the conventional pulp mold density 0.3 g / cm ³ It is superior to the density of styrofoam, and its elastic modulus is in the range of 300 to 900 kPa, which is significantly smaller than conventional foamed styrofoam (941 kPa) or pulp mold (1768 kPa).

Claims (5)

Chipping waste residues or small hardwoods generated during processing of forests or wood into a cross-sectional area within a range of 1.0 to 5.0 mm and a length within a range of 5 to 20 mm; Cooking the chipped waste residue or small hardwood through a cooking apparatus heated in a range of 120 to 140 ° C., and then pulping using a predetermined disintergating process; And The heated cooker and the pulp puffed with a thermosetting pulp (Thermomechanical Pulp, TMP) is mixed with starch and then vacuum dewatered in both directions using a vacuum forming apparatus capable of dual vacuuming. To produce a shock absorbing material (shock absorbing material); through the thermo-system pulping of the waste wood comprising a buffer material manufacturing method. The method of claim 1, wherein the pulping step, The chipped waste residue or small diameter material is heated within a range of 120 to 140 ° C. and cooked for 1 to 5 minutes through a cooking apparatus having an operating capability within a range of 3 to 4 kg / cm ² , and then using a predetermined sea island. Method for producing a cushioning material through the thermo-based pulping of waste wood, characterized in that the pulping so that the freeness of the pulp fibers 650 ~ 700 mL CSF. The method of claim 1, wherein the thermomechanical pulp (TMP) is mixed with starch, Method for producing a buffer material through the thermo-based pulp of the waste wood, characterized in that the thermo-based pulp (TMP) 75 ~ 100g mixed with starch in the range of 10 to 30% by weight of the thermo-based pulp (TMP) weight. The method of claim 1, Drying the buffer material; And And a surface sizing treatment on the surface of the dried buffer material. The method of manufacturing a buffer material through thermomechanical pulping of waste wood, comprising: a step of surface sizing. It is manufactured by a method for producing a buffer material through the thermomechanical pulping of the waste wood according to any one of claims 1 to 4, the elastic modulus is in the range of 300 ~ 900kPa, density is 0.08 ~ 0.12g / cm Waste wood buffer material, characterized in that within ^three ranges.

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