KR100729789B1 - A mixed paper and the producting method thereof - Google Patents

Abstract

A method for manufacturing mixed paper is provided to enhance flexure strength and tensile strength at break, by hardening a mixture in which plastic resin is mixed in waste paper so as to manufacture the mixed paper. Waste paper is dried through hot air or heat in a drying machine(s11). The dried waste paper is crushed to form paper pieces in a crushing machine(s12). A predetermined amount of plastic resin is mixed into the paper pieces to produce a mixture(s13). The mixture is inputted into a mold, compression-molded in a predetermined configuration, and hardened by heat and pressure, thereby manufacturing the final mixed paper(s14).

Description

A mixed paper and the manufacturing method

1 is a flow chart of a mixed paper manufacturing method according to an embodiment of the present invention.

2 is a flow chart of a mixed paper manufacturing method according to another embodiment of the present invention.

The present invention relates to a mixed paper, and in particular, by impregnating a resin in the paper to compression molding can utilize a variety of phage can reduce the cost and does not require a separate proof of prevention or heat treatment during import and export, light weight and workability The present invention relates to a mixed paper having excellent tensile strength, breaking strength, bending strength and water resistance, and a method of manufacturing the same.

Pallets used for loading various products are classified into wooden pallets made of wood, artificial wood pallets made of artificial wood, and corrugated cardboard pallets made of corrugated paper. Since pallets are imported and imported with various products loaded with various products, each country is concerned about the inflow and outflow of pests if the pallets exported or imported with the products are wooden pallets. Therefore, the use of wooden pallets interferes with the import and export business, so the industry prefers artificial wood pallets that use sawdust instead of them. However, the artificial wood pallet does not have a problem of prevention, but it is expensive and heavy, which causes inconvenience in many ways.

Silk, as well as such a problem, when the pallet is made of corrugated cardboard, various kinds of phages, etc. are generated, there is a problem of waste of resources and even waste disposal costs occur because these wastes are not recycled.

The present invention has been made in order to solve the problems of the prior art, the object of the present invention can be recycled by molding a mixture of a predetermined amount of resin in the crushed phage and the weight of the artificial wood with the sawdust as the main raw material Compared to provide light workability and excellent tensile strength, flexural strength or water resistance, it is to provide a mixed paper and a method of manufacturing the same.

It is an object of the present invention to provide a mixed paper having a mechanical property enough to be utilized as various pallets or building materials using these mixed paper and a manufacturing method thereof.

The present invention is implemented by the embodiment having the following configuration in order to achieve the above object.

According to a first embodiment of the present invention, the mixed paper of the present invention is characterized in that it is formed by molding and then curing a mixture of the pulverized phage crushed powder and the plastic resin into a predetermined shape.

According to a second embodiment of the present invention, the mixed paper of the present invention is characterized in that, in the first embodiment, the phages are 60 to 90% by weight and the resin is 10 to 40% by weight.

According to a third embodiment of the present invention, the mixed paper of the present invention, in the second embodiment, the plastic resin has a liquid or powder form, selected from the group consisting of melamine resin, urea resin, phenol resin, etc. It is characterized by.

According to the fourth embodiment of the present invention, the mixed paper manufacturing method of the present invention, the grinding step of forming a phage pulverized by grinding a variety of phage, and mixing a predetermined amount of plastic resin with the phage crushed to form a mixture Mixing step, it is characterized in that consisting of a compression molding step to complete the mixed paper by compression molding and heat curing to a predetermined shape by putting the mixture into a mold.

According to a fifth embodiment of the present invention, the mixed paper manufacturing method of the present invention, in the fourth embodiment, in the mixing step, the phage crushed powder is mixed with the plastic resin in the powder state, in the compression molding step It is characterized in that it further comprises a melting step of heating the mixture to melt the plastic resin.

According to a sixth embodiment of the present invention, the mixed paper manufacturing method of the present invention includes a grinding step of grinding a variety of phages to form a phage crushed, a mixing step of mixing a predetermined amount of plastic resin to the phage crushed, It is characterized in that the injection molding step of forming a mixture of the pulverized phage and resin injection molding to form a predetermined shape and heat curing to complete the mixed paper.

According to the seventh embodiment of the present invention, the mixed paper manufacturing method of the present invention, in the sixth embodiment, in the mixing step, the phage crushed powder is mixed with the plastic resin in the powder state, in the injection molding step It is characterized in that it further comprises a melting step of heating the mixture to melt the plastic resin.

 According to an eighth embodiment of the present invention, in the mixed paper manufacturing method of the present invention, in any one of the fourth to seventh embodiments, the grinding step is a resin impregnation step and a fine powder forming step It includes, wherein the resin impregnation step is a step of curing by impregnating the thermoplastic resin in the phage, wherein the fine powder forming step is characterized in that the step of forming a phage pulverized by fine powdering the phage impregnated with the resin .

According to a ninth embodiment of the present invention, the mixed paper manufacturing method of the present invention, in any one of the fourth embodiment to the seventh embodiment, wherein the manufacturing method is to dry the phage before the mixing step Characterized in that it further comprises a drying step.

In the following, the applicant will be described in detail the present embodiments of the present invention.

The mixed paper of the present invention is formed by mixing and squeezing a phage pulverized product formed by finely pulverizing various papers with a predetermined amount of plastic resin.

The phage pulverized product is a pulverized phage of various papers. Because paper is rich in fiber, when processed and mixed with resin, it has a very high mechanical strength, which will be described later through experimental examples. Furthermore, in order to strengthen the binding force between the phage pulverized product and the resin, the phage pulverized product has a fluffy shape in which a plurality of pores are formed in the form of channels on the pulverized powder when pulverized, so that the pores are impregnated with resin, thereby increasing the strength. It is desirable to ensure that, such a fluffy shape can be obtained in the process of grinding the paper of the pulp material. Of course, it may be provided in the form of particles or may be provided in the form of fine powder. This will be described later.

The plastic resin is provided in liquid form or in powder form. When the plastic resin is provided in powder form, the plastic resin is mixed with the phage pulverized product and then melted. Melamine resins, urea resins, phenol resins, and the like are preferred, but other plastic resins are not excluded.

Such mixed paper may be produced by the compression molding method shown in FIG. 1 or the injection molding method shown in FIG.

First, a compression molding method will be described with reference to FIG. 1.

The compression molding method of the present invention includes a gripping drying step (s11, s21), a gripping grinding step (s12, s22), a resin mixing step (s13, s23), a compression molding step (s14).

In the holding and drying step (s11, s21), since the paper contains its own moisture, it is preferable to undergo a drying process before mixing with the resin. The phage is put into a dryer and dried by hot air or a heater of a predetermined temperature.

The gripping crushing step (s12, s22) is a step of crushing the discarded phage into a grinder after manufacturing a variety of paper products to a predetermined size. If the phage is composed of pulp, the ground product may have a downy shape depending on the grinding environment. As described above, the strength of the mixed paper can be improved by taking such a shape. The phage pulverized product may be finely pulverized to a particle size of 2 to 3 mm, or may be pulverized to a fine powder of several microns, for example, 10 to 50 μm.

As such, in the case of grinding into fine powder, the phage grinding step (s12, s22) may further include a resin impregnation step (s121, s221) and the fine powder forming step (s122, s222). The resin impregnation step (s121, s221) refers to a step of curing by impregnating the thermoplastic resin in the phage in order to grind the phage into fine powder. In a general state, the phage contains a fibrous component, so that it is difficult to make it fine during crushing. Therefore, a process of impregnating and curing the thermoplastic resin in the phage to give a certain strength or hardness is necessary, and for this reason, a resin impregnation step is required. will be.

In addition, the fine powder forming step (s122, s222) is a step of fine powdering into a grinder that is cured through the resin impregnation step. Through such a process, the phage is a phage grinding material having a size of 10㎛ ~ 50㎛. In this case, it should be interpreted that the breakable in nano units also fall within the scope of the present invention.

The resin mixing step (s13, s23) is a step of forming a mixture by mixing the phage crushed and plastic resin. Plastic resins have a liquid or powder form. At this time, it is preferable to mix about 40 to 100 weight% of phage grinding | pulverization products, and 10 to 40 weight% of resin.

The compression molding step (s14) is a step of putting the mixture into a mold having a predetermined shape and curing by pressurized heating by a hydraulic press. If the resin is in the form of a powder, in the pressurizing process, the temperature should be about 140 ° C. to 180 ° C. to further melt the powder in the form of a resin. It is heated and thermally cured. Of course, when hardening, it is not excluded that it may harden by adding another hardening | curing agent.

According to another embodiment of the present invention, as shown in Figure 2, when the phage is finely divided into micro units (10 ~ 50㎛) in the milling step 22, the powdered phage pulverized powder and powder The mixed paper may be produced by mixing and melting the resin in the form and then injection molding (S24).

Applicants have tested the weight, strength and water resistance of the present embodiment below to be described as follows.

Psalm Fabrication

(1) Test Example

Put the phages of cardboard with a particle size of 2 ~ 3mm in the dryer and dry at 100 ℃ for 5 minutes, then mix 80% by weight of the dried phages with 20% by weight of liquid phenolic resin and put it into the mold. Pressurized heating with a hydraulic press to prepare a mixed paper of 5mm thickness. Then, this was cut into 150 mm x 50 mm in width x length to prepare a specimen (test example).

(2) Comparative Example 1

On the other hand, 5mm-thick imported artificial wood (manufacturer: LHD (Singapore material), importer: Hanjae timber, brand name: technical wood) produced by impregnating resin into sawdust was width X length

The specimen (comparative example 1) was prepared by cutting into 150 mm x 50 mm.

(3) Comparative Example 2

A 5 mm thick plywood (manufacturer: Sunchang Industrial Co., Ltd., plywood, 5 ply) was cut to the same size to prepare a specimen (Comparative Example 2).

(4) Comparative Example 3

A plastic sheet (Moonil Co., Ltd., material: polypropylene) having a thickness of 5 mm was cut to the same size to prepare a specimen (Comparative Example 3).

Test 1: Determination of Water Content

Applicants measured their moisture content on the specimens. The moisture content was measured using a commercially available wood moisture meter. In test 1, a wood moisture meter under the model name HM530, developed by the Kett Institute of Science in Japan and imported and sold by Korea's kett Corporation, was used. The results are shown in Table 1 below, and express the weight of the water as a percentage of the total specimen weight. In addition, Comparative Example 3 was excluded from the experiment because it is a plastic.

Table 1

division  Test Example Comparative Example 1 Comparative Example 2 Self Moisture Content 0-3% 7-9% 8-9%

As can be seen in Table 1 above, the moisture content of the test example is the lowest, which seems to be due to the drying process in the specimen preparation step.

Test 2: Determination of weight and moisture deposit

Applicants immersed the specimens in four reservoirs of water for 24 hours and measured the amount of mass change before and after deposition. Comparative Example 3 was not subjected to the deposition test because it is plastic, and the results are shown in Table 2 below.

[Table 2]

division Test Example Comparative Example 1 Comparative Example 2 Deposition 20 g 30 g 20 g After deposition 20.4 g 31.5 g 21.4 g Mass change 2% 5% 7%

According to Table 2 above, (1) even with the same size specimen, it can be confirmed that the weight of the test sample is lighter than artificial wood so that it is only 50% of Comparative Example 1, and (2) the mass even after 24 hours deposition It can be confirmed that the change amount is the smallest in the test example, which confirms that the test example is superior in water resistance compared to Comparative Example 1.

Test 3: Measurement of Bending Strength

Flexural strength was measured according to KS A 1044 standard. KS A 1044 is a criterion for testing the bending strength of the upper and lower plates of pallets and measures the strength when the upper plate is damaged by applying a load to the upper plate and the results are shown in Table 3 below.

Table 3

division Test Example Comparative Example 1 Comparative Example 2 Comparative Example 3 Whip Strength (kgf / cm ² 24 18 15 12

According to the above Table 3, it can be confirmed that the test example shows a much higher strength than Comparative Examples 1 to 3.

As can be seen in Tables 1 to 3 above, it can be seen that the mixed paper of the present invention is superior to artificial wood or plastic products in terms of strength or water resistance. In addition, even if the economic effect, the mixed paper of the present invention is about 40 ~ 50 won per 1kg but imported artificial wood is about 800 won per 1kg, if you replace the imported artificial wood with the present invention can significantly reduce the foreign currency expenditure Very good for the economy.

To describe another embodiment of the present invention, since the above mixed paper is laminated and used in multiple layers, very high strength can be ensured, and thus it can be sufficiently utilized as various materials such as building materials in industrial sites.

The present invention has the following effects by the above configuration.

In the present invention, since the paper-rich paper is used as the main raw material and hardened by impregnating plastic resin, it can be used as various pallets and building materials because it can obtain higher bending strength or breaking strength than conventional artificial wood and plastic products. Has the effect.

In addition, since the present invention is formed by mixing a resin on paper, the water resistance is very excellent compared to conventional plywood and artificial wood, and its weight is also lighter than artificial wood, so that it is possible to replace artificial wood, which was mostly dependent on imports. Can be.

Claims (9)

delete delete delete A pulverizing step of pulverizing various phages to form a phage pulverization, a mixing step of mixing a predetermined amount of plastic resin with the phage pulverization to form a mixture, and putting the mixture into a mold to compression molding and heat curing Mixed paper manufacturing method consisting of a compression molding step to complete the mixed paper. 5. The method of claim 4, wherein in the mixing step, the phage pulverized product is mixed with the plastic resin, and in the compression molding step, a melting step of melting the plastic resin by heating the mixture. . Grinding step of grinding a variety of phages to form a phage pulverization, a mixing step of mixing a predetermined amount of plastic resin to the phages crushed, and injection molding the mixture of the phages pulverized product and the resin to form a predetermined shape and heat curing Mixed paper manufacturing method consisting of a curing step to complete the mixed paper. The method according to claim 6, wherein in the mixing step, the phage pulverized material is mixed with the plastic resin, and in the injection molding step, the mixing paper further comprises a melting step of melting the plastic resin. . The method of claim 4, wherein the grinding step further includes a resin impregnation step and a fine powder forming step, wherein the resin impregnation step is a step of impregnating the resin with a thermoplastic resin and curing the resin. The fine powder forming step is a mixed paper manufacturing method, characterized in that the step of forming a phage pulverized by fine powdering the resin impregnated phage. The method according to any one of claims 4 to 7, wherein the manufacturing method further comprises a drying step of drying the phage before the mixing step.

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