KR102530774B1 - Pulp tray - Google Patents

Abstract

The present invention relates to an eco-friendly coated pulp tray for electronic products. An eco-friendly pulp tray according to an embodiment of the present invention includes a pulp layer including pulp fibers; and a composite layer disposed on the pulp layer, wherein the composite layer includes pulp fibers and functional materials disposed in spaces created by the pulp fibers.

Description

Eco-friendly coated pulp tray for electronic products {Pulp tray}

The present invention relates to an eco-friendly coated pulp tray for electronic products. In addition, it includes a pulp tray applicable to various uses other than electronic products.

Pulp trays not only perform the function of safely protecting various products such as daily necessities such as food and cosmetics, and high-tech devices such as smartphones and semiconductors, but are also used as a means to increase the value of the product by creating a sense of beauty. . Recently, as a problem caused by environmental pollution has emerged, the demand for an eco-friendly pulp tray having high degradability is increasing.

However, in the case of the conventional eco-friendly pulp tray, pulp dust is generated due to vibration or friction at the part where the product and the pulp tray come into contact, and the generated dust adheres to the surface of the electronic device, resulting in reduced user satisfaction and complaints. are often brought up.

Prior art literature discloses an eco-friendly pulp tray that is environmentally friendly and can have price competitiveness by reducing manufacturing cost and lightening weight while increasing durability and naturally disintegrating well.

Korean Patent Registration No. 10-1668736

An object of the present invention is to provide an environmentally friendly pulp tray of excellent quality.

Also, generation of dust can be suppressed.

In addition, it is possible to increase user satisfaction by improving visual aesthetics and tactile sensation.

An eco-friendly pulp tray according to an embodiment of the present invention includes a pulp layer including pulp fibers; and a composite layer disposed on the pulp layer, wherein the composite layer includes pulp fibers and functional materials disposed in spaces created by the pulp fibers.

The functional material may include at least one of water-soluble polyurethane, acrylic resin, and silicone resin.

The functional material may include the pulp fibers.

An average particle size of pulp fibers included in the functional material may be smaller than that of pulp fibers included in the pulp layer.

The amount of pulp fibers included in the functional material may be 1 to 20 parts by weight based on the total weight of the functional material.

The functional material may further include a matting agent.

The content of the matting agent included in the functional material may be 0.1 to 5 parts by weight based on the total weight of the functional material.

The matting agent may include at least one of SiO ₂ , Al ₂ O ₃ , CaCO ₃ , ZnO, and TiO ₂ .

A surface roughness (Ra) of the composite layer may be 0.2 μm to 1.5 μm.

Eco-friendly pulp tray according to an embodiment of the present invention can suppress the generation of dust.

In addition, it is possible to increase user satisfaction by improving visual aesthetics and tactile sensation.

Fig. 1 (a) shows an enlarged photograph of the pulp layer, and Fig. 1 (b) shows an enlarged photograph of the functional layer.
2 and 3 show a method for manufacturing an environmentally friendly pulp tray according to an embodiment of the present invention.
Figure 4 shows the surfaces of Examples 1 to 4.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention may be modified in various forms, and the scope of the present invention is not limited to the embodiments described below. In addition, the embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art.

An eco-friendly pulp tray according to an embodiment of the present invention includes a pulp layer including pulp fibers; and a composite layer disposed on the pulp layer, wherein the composite layer includes pulp fibers and functional materials disposed in spaces created by the pulp fibers.

By performing the function of preventing dust from being generated on the surface of the finished product, it fills between the pulp fibers to prevent the pulp fibers from rubbing against the outside and falling off. The functional material is not particularly limited, but preferably may include a polymer resin such as water-soluble polyurethane, acrylic resin, and silicone resin.

In this step, the functional material may be added in an amount of 15 parts by weight or less, preferably 2 to 15 parts by weight, based on the total weight of the raw materials. If the content of the functional material is too high, the viscosity may increase and processing may be difficult. If the content of the functional material is too low, there is a problem in that the anti-vibration effect is reduced.

The functional material may include the pulp fibers. More specifically, the functional material may further include a pulp material such as wood pulp or non-wood pulp, which is a raw material component. The pulp material included in the functional material may be 20 parts by weight or less, preferably 1 to 20 parts by weight, and more preferably 1 to 10 parts by weight, based on the total weight of the functional material. polymer resin such as urethane) may be 25 parts by weight or less, preferably 2 to 25 parts by weight, more preferably 6 to 12 parts by weight, based on the total weight of the functional material. Through this, it is possible to strengthen the binding force between the functional material and the raw material, and it is possible to improve the emotional quality by increasing the content of the pulp material exposed on the surface of the finished product (40).

An average particle size of pulp fibers included in the functional material may be smaller than that of pulp fibers included in the pulp layer. This may be to increase the content of pulp fibers by performing a refining process on the pulp material, which is a raw material of pulp fibers in the pulp layer. Through this, mixing of the functional particles can be facilitated, and the functional particles can be well penetrated between the raw materials. The refining process is a process of reducing the size of the pulp material, and may be generally used in the pulp industry, and is not particularly limited.

The functional material may further include a matting agent. The matting agent is a material that affects the gloss of a final product, and may include at least one of SiO ₂ , Al ₂ O ₃ , CaCO ₃ , ZnO, and TiO ₂ . The matting agent may be added in an amount of 0.1 to 5 parts by weight based on the total weight of the functional material. If the content of the matting agent is high, the gloss can be lowered, but it is difficult to disperse the matting agent in the functional material, and there is a problem in that dust is generated in the final product due to a phenomenon in which the matting agent is agglomerated. If the content of the matting agent is low, the gloss cannot be sufficiently lowered.

The composite layer is formed to have a dust-proof function, is denser than the pulp layer, and has a smooth surface. More specifically, the surface roughness (Ra) of the composite layer may be 0.2 to 1.5 μm, more preferably 0.8 to 1.2 μm. If the surface roughness of the composite layer is too low, since the functional material of the composite layer is not sufficiently contained, the anti-vibration function may decrease, and if the surface roughness of the composite layer is too high, defects may increase during manufacturing. However, it is difficult to apply it as a product due to the phenomenon that the surface glistens even after manufacturing.

The manufacturing method is described below.

2 and 3 show a method for manufacturing an environmentally friendly pulp tray according to an embodiment of the present invention. Referring to Figures 2 and 3, preparing a mixture 10 by mixing the raw materials; Forming the mixture 10 with a molding machine 200 to produce a primary molded article 20; And heating and pressurizing the primary molded product 20 with a thermocompression bonding machine 300 to produce a secondary molded product 30; including, after the step of producing the primary molded product 20, the primary molded product 20 A step of coating a functional material on the surface of the molded product 20 is further included, or a step of coating a functional material on the surface of the secondary molded product 30 after the step of manufacturing the secondary molded product 30 is further included. In addition, the step of manufacturing the finished product 40 by cutting the secondary molded product 30 by product and the step of inspecting and packaging the finished product 40 may be further included. Here, the portion produced through molding of the raw material is the pulp layer, and the portion produced through coating of the functional material is the composite layer.

In the step of preparing the mixture 10 by mixing the raw materials, the raw materials may include various environmentally friendly materials such as pulp materials. The pulp material may be wood pulp or non-wood pulp, and the non-wood pulp may be bamboo, sugar cane, and the like. The raw material may be supplied to the mixer 100 in a pulverized state. In this case, the raw material may further include a waterproofing agent, a dye, a stabilizer, and the like in addition to wood pulp or non-wood pulp. More specifically, after putting the pulp material in a grinder, adding a waterproofing agent, dye and stabilizer in an amount of 20 parts by weight or less, preferably in the range of 10 to 20 parts by weight, based on the pulp material, it may be pulverized for 10 to 60 minutes. . In this step, the pulverized raw material may be mixed using the mixer 100, and a step of diluting the raw material may be included. To this end, water may be added to the raw materials so that the content of the raw materials in the total mixture 10 is 1 to 10 parts by weight, preferably 3 parts by weight or less. Next, the mixed mixture 10 may be stored for a certain period of time. The mixer 100 is not particularly limited, and may include a supply device 110 for adding raw materials and water, a container, a stirrer, and the like. In addition, a storage device 130 for storing the mixture 10 may be separately provided as needed.

The step of manufacturing the primary molded product 20 by molding the mixture 10 with the molding machine 200 is a step of giving a shape to the mixture 10 using a mold having a predetermined shape. This step may include giving a shape to the raw material using the upper mold 210 and the lower mold 220 of the molding machine 200 and heating and compressing the raw material. In addition, the step of imparting the shape may include removing water from the raw material.

The step of manufacturing the secondary molded product 30 by heating and pressurizing the primary molded product 20 with a thermocompression bonding machine 300 further pressurizes and heats the primary molded product 20 to increase the strength of the processed product and increase the surface It is a process that makes the In addition, through this process, water contained in the primary molded product 20 can be removed and the thickness can be controlled. Preferably, the thickness of each part of the secondary molded product 30 may be 1/5 to 1/3 of the thickness of the primary molded product 20. In this step, the temperature at which the primary molded product 20 is heated may be 100 to 200°C, preferably 110 to 170°C. If the temperature is too low, there is a problem of deformation due to insufficient drying, and if the temperature is too high, problems such as damage to the molded article, discoloration, and shrinkage may occur. This process may be performed for 60 to 240 seconds.

Next, a process of naturally drying the secondary molded product 30 may be performed. This step is for performance and dimensional stabilization, and may be preferably performed for 6 to 24 hours, but is not particularly limited.

Next, a step of manufacturing the finished product 40 by cutting the secondary molded product 30 by product using the cutting machine 400 may be performed. The cutter 400 may include a blade or the like and is not particularly limited.

This embodiment may further include a process of preventing dust generation by adding a functional material to the raw material or coating the surface of the primary molded product 20 or the secondary molded product 30 with a functional material.

Referring to FIG. 2 , after the step of manufacturing the primary molded product 20, a step of coating a functional material on the surface of the primary molded product 20 may be further included. In addition, referring to FIG. 3 , after the step of manufacturing the secondary molded product 30, a step of coating a surface of the secondary molded product 30 with a functional material may be further included.

2 and 3, the coating method is not particularly limited, but a functional material is applied to the surface of the primary molded product 20 or the secondary molded product 30 using a coating machine 500 such as a three-dimensional spray device. This can be done by spraying evenly. Alternatively, it may be performed by immersing the primary molded product 20 or the secondary molded product 30 in a functional material contained in a container. This step may further include a process of drying after coating.

As described above, the functional material performs a function of preventing dust from being generated on the surface of the finished product 40, and may preferably include a polymer resin such as water-soluble polyurethane and silicone resin. The functional material may be mixed in a solvent such as water so that the content of water-soluble polyurethane or silicone is 40 to 50 parts by weight based on the total weight of the functional material.

In addition, the functional material may further include a pulp material such as wood pulp or non-wood pulp, which is a raw material component. The pulp material included in the functional material may be 20 parts by weight or less, preferably 10 to 20 parts by weight, based on the total weight of the functional material, and at this time, the content of the dustproof material (polymer resin such as water-soluble polyurethane) is It may be 40 parts by weight or less, preferably 20 to 40 parts by weight based on the total weight. Through this, it is possible to strengthen the binding force between the functional material and the raw material, and it is possible to improve the emotional quality by increasing the content of the pulp material exposed on the surface of the finished product (40). The raw material component included in the functional material may have a smaller average particle size than the raw material added in the step of preparing the mixture 10. In addition, the pulp fiber content may be increased by performing a refining process on the raw material. Through this, mixing of the functional particles can be facilitated, and the functional particles can be well penetrated between the raw materials. The refining process is a process of reducing the size of the pulp material, and may be generally used in the pulp industry, and is not particularly limited.

Manufacture of eco-friendly pulp tray

Example 1

The pulp was ground so that the ratio of short and long fibers was between 3:7 and 5:5 by weight. A mixture was prepared by putting the wood pulp in a mixer and mixing a waterproofing agent, a dye, and a stabilizer in an amount of 5 parts by weight based on the weight of the wood pulp. Water was added thereto so that the content of the mixture was 3 parts by weight based on the total weight, and the mixture was stored while stirring for 24 hours.

Next, a primary molded article was manufactured by pressing and heating using a molding machine in which a 150 mesh mesh was installed in the lower mold. At this time, the heating temperature was maintained in the range of 50 to 70 ° C, and was performed for 120 seconds.

Next, the primary molded product was put into a thermocompression press and pressurized and heated to prepare a secondary molded product. At this time, the heating temperature was maintained in the range of 130 to 150 ° C, and was performed for 120 seconds.

The functional material prepared in advance was evenly sprayed on the surface of the secondary molded article using a three-dimensional spray device. The functional material was prepared by adding hydrophilic polyurethane and refined pulp to water. At this time, 4 parts by weight of the hydrophilic polyurethane and 3 parts by weight of the refined pulp were added based on the total weight of the functional material.

Next, an eco-friendly pulp tray was prepared by drying at a high temperature.

Example 2

When preparing the functional material, it was prepared in the same manner as in Example 1, except that the functional material was prepared so that the content of water-soluble polyurethane was 6 parts by weight based on the total weight of the functional material.

Example 3

When preparing the functional material, it was prepared in the same manner as in Example 1, except that the functional material was prepared so that the content of water-soluble polyurethane was 12 parts by weight based on the total weight of the functional material.

Example 4

When preparing the functional material, it was prepared in the same manner as in Example 1, except that the functional material was prepared so that the content of water-soluble polyurethane was 25 parts by weight based on the total weight of the functional material.

Example 5

When manufacturing the functional material, the pulp refined with respect to the total weight of the functional material is 3 parts by weight, the content of water-soluble polyurethane is 12 parts by weight, and SiO ₂ 3 It is the same as in Example 1 except that the functional material is prepared so that it is 3 parts by weight. It was manufactured.

Example 6

When manufacturing the functional material, the pulp refined with respect to the total weight of the functional material is 3 parts by weight, the content of water-soluble polyurethane is 12 parts by weight, and SiO ₂ 6 parts by weight The same as in Example 1 except that the functional material is prepared. It was manufactured.

Surface roughness measurement and gloss inspection of eco-friendly pulp trays

Two eco-friendly pulp trays prepared in Examples 1 to 6 were selected, respectively, and Ra was measured using a surface roughness meter, and the measured values are shown in Table 1 below. The surface was observed through an optical microscope for gloss inspection, and photos of the surfaces of Examples 1 to 4 measured using an optical microscope were shown in FIGS. 4 (a) to (d), respectively. For dust inspection, the surfaces of Examples 1 to 6 were rubbed with the same pressure using a white tissue to examine whether or not dust was smeared.

turn Water-soluble polyurethane content
(parts by weight) matting agent content
(parts by weight) Surface roughness (Ra)
(μm) Polish dust generation Example 1-1 4 0 2.28461 lowness height Example 1-2 4 0 1.9460 lowness height Example 2-1 6 0 1.0369 lowness lowness Example 2-2 6 0 0.9914 lowness lowness Example 3-1 12 0 0.4950 rather low lowness Example 3-2 12 0 0.5228 rather low lowness Example 4-1 25 0 0.1692 height very low Example 4-2 25 0 0.1973 height very low Example 5-1 12 3 0.4682 lowness lowness Example 5-2 12 3 0.4852 lowness lowness Example 6-1 12 6 0.4714 lowness height Example 6-2 12 6 0.4598 lowness height

Example 1 has a high surface roughness and a high possibility of dust generation due to external impact. Example 4 has a problem in that it is difficult to apply it as a product because the surface roughness is low and the possibility of dust generation is low, but the gloss is too high. It can be seen that Examples 2 and 3 have excellent surface roughness and gloss, and thus have a level of gloss that can be applied as a product while having a low possibility of dust generation.

In addition, in the case of Example 5 using the matting agent, the gloss is lowered compared to Example 3, so it is more suitable for product application. However, Example 6, in which the content of the matting agent exceeds 5 parts by weight, has excellent gloss properties, but it can be seen that the matting agent is smeared and dust is generated.

The present invention is not limited by the above-described embodiments and accompanying drawings, but is intended to be limited by the appended claims. Therefore, various forms of substitution, modification and change will be possible by those skilled in the art within the scope of the technical spirit of the present invention described in the claims, and this also falls within the scope of the present invention. something to do.

100: mixer, 110: raw material supply device, 120: functional material supply device, 130: storage device, 200: molding machine, 210: upper mold, 220: lower mold, 221: outlet, 230: adsorption member, 240: mold driving unit, 250: vessel, 260: mold heating unit, 300: thermal compression machine, 310: upper compression machine, 320: lower compression machine, 330: compression machine driving unit, 340: thermal compression bonding machine heating unit, 400: cutting machine, 500: coating machine, 10: mixture, 20 : 1st molded product, 30: 2nd molded product, 40: finished product

Claims (6)

a pulp layer comprising pulp fibers; and
Including; composite layer disposed on the pulp layer,
The composite layer includes pulp fibers and a functional material disposed in spaces created by the pulp fibers,
The functional material includes 6 to 12 parts by weight of water-soluble polyurethane and 3 parts by weight of a matting agent based on the total weight of the functional material,
The surface roughness (Ra) of the composite layer is 0.4682 to 1.0369 μm,
Eco-friendly pulp tray.
delete According to claim 1,
wherein the functional material comprises the pulp fibers;
Eco-friendly pulp tray.
According to claim 3,
The average particle size of the pulp fibers included in the functional material is smaller than that of the pulp fibers included in the pulp layer,
Eco-friendly pulp tray.
According to claim 1,
The matting agent is at least one of SiO ₂ , Al ₂ O ₃ , CaCO ₃ , ZnO and TiO ₂ ,
Eco-friendly pulp tray.


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