Patent Application
20200180199
This application claims the benefit of Korean Patent Application No. 10-2018-0157213 filed on Dec. 7, 2018, which is hereby incorporated by reference herein in its entirety.
The present invention relates to a method of manufacturing a real material product having a composite layer and using a liquid-phase reactive curing method. More specifically, the present invention relates to a method of manufacturing a real material product in which a composite layer is formed on both surfaces of a real material by using a liquid-phase reactive curing method.
An interior material, such as realwood, is used as a finishing material for the interior and exterior finishing of automobiles, the panels of mobile phones, and the buttons and logo parts of electronic devices such as washing machines, and thus the appearances, such as texture, touch, etc., of products can be improved and internal structures can be protected by blocking noise, flames, oxygen, etc.
Korean Patent No. 10-0913811 discloses a method of manufacturing a molded product using a realwood film as an interior material. As shown in
Korean Patent Application Publication No. 10-2018-0069404 of the present applicant is directed to a “method of manufacturing a molded realwood product,” and discloses a process of insert-injecting a plastic resin with a realwood and then painting the over surfaces of the realwood. A painted layer prevents damage to the surface of the realwood from the outside, and allows natural wood texture and luster to be maintained for a long time.
In these patents, for example, a spray coating method and a compression molding method are used as secondary processes for forming coating layers, such as a surface layer and a coating layer.
In the case of the spray coating method, as shown in
In the case of the compression molding method, as shown in
Accordingly, an object of the present invention is to provide an improved liquid-phase reactive curing molding manufacturing method which enables a composite layer to be formed in a real material layer.
In order to achieve the above-described object, the present invention provides a method of manufacturing a real material product having a composite layer and using a liquid-phase reactive curing method, the method including: (1) forming a real material layer by cutting and hot-forming a real material; (2-1) forming a plastic resin layer on the first surface of the real material layer by mounting the real material layer in the first cavity of a molding machine and curing a plastic resin fed to the first cavity; (2-2) forming a second resin layer by mounting the real material layer, on which the plastic resin layer is formed, in the second cavity of the molding machine, feeding a liquid resin to a second surface, and curing the liquid resin; and (2-3) during the performance of step (2-2), forming a plastic resin layer on a first surface of another second real material layer by feeding a plastic resin to the other second real material layer mounted in the first cavity of the molding machine and curing the plastic resin; thereby successively injection-molding real material products each having a composite layer in which a plastic resin layer is formed on a first surface and a cured resin layer is formed on a second surface.
The second resin layer may be made of any one of polyurethane (PUR) and polyurea (PUA) materials.
The plastic resin layer may be made of any one of polycarbonate (PC), polyimide (PI), polyethersulfone (PES), polyarylate (PAR), polyethylene naphthalate (PEN), polyethyleneterephthalate (PET), cycloolefin copolymer, acrylic, acrylonitrile butadiene styrene (ABS), acrylonitrile styrene acrylate (ASA), polybutylene terephthalate (PBT), and styrene acrylonitrile (SAN).
The real material is made of any one of a carbon fiber composite material including wood, fabric, stone, artificial leather, or plastic, a composite material such as glass fiber reinforced plastic, and a metal sheet.
In order to improve adhesion to the polyurethane (PUR) or polyurea (PUA) material, plasma preprocessing, primer preprocessing with a material having urethane or polyolefin chloride as a main component, or both plasma preprocessing and primer preprocessing may be performed on the second surface of the real material layer.
A three-dimensional volume may be imparted to, a glossy layer for gloss may be formed on, or a color may be imparted to the plastic resin layer or second resin layer by using pattern molds.
The present invention provides a real material product including the composite layer which is manufactured by the above-described method.
The above and other objects, features, and advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
Some embodiments of the present invention will be described in detail below with reference to the accompanying exemplary drawings.
It should be noted that in the assignment of reference symbols to the components of the drawings, the same components are designated by the same reference symbols as much as possible even when they are shown in different drawings. Furthermore, in the following description of the present invention, when it is determined that a detailed description of a well-known technology related to the present invention may unnecessarily make the gist of the present invention obscure, the detailed description will be omitted.
A liquid-phase reactive curing method according to the present invention is characterized in that first and second injection (molding) processes are simultaneously and successively performed in a single molding machine in order to manufacture real materials each having a composite layer. Conventionally, when a laminating method, a painting method such as spraying, or an injection process is applied to a real material, it is necessary to repeatedly perform similar molding processes in order to form a composite layer. Accordingly, the conventional method is disadvantageous in that work efficiency is low, the overall process is complicated, and yield is low.
Furthermore, the present invention is characterized in that a plastic resin layer and a polyurethane or polyurea layer are simultaneously formed on a first surface and a second surface, respectively, around a real material layer by applying a simultaneous molding process to a real material, thereby enabling a product having a composite layer to be rapidly and precisely manufactured.
A real material product having a composite layer and using a liquid-phase reactive curing method according to the present invention is manufactured through the process of
First, a real material, such as wood, is cut to fit the final shape of a product at step S10. Wood is merely one example. The real material may be fabric, stone, artificial leather, a carbon fiber composite material including plastic such as carbon fiber reinforced plastic (CFRP), a composite material such as glass fiber reinforced plastic, a metal sheet, or the like, and is not limited to a particular material. Although cutting is preferably laser cutting using an NC machine tool, laser cutting may be omitted or physical cutting using a cutting blade may be performed in the case of a material having high heat resistance or a metal having high strength.
Thereafter, the cut real material is subjected to hot forming at step S12. More specifically, a mold previously fabricated to fit the final shape of the product is preheated, and the real material is placed in the mold and thermally compressed using a press machine. In the case where there are many voids in the real material, when the real material is impregnated with a transparent plastic resin solution such as a acrylic or SAN solution, and powder and then subjected to a hot forming process, voids are removed by thermal compression, and thus bubbles can be prevented from being generated in a subsequent molding process. In the case of a real material whose color and physical properties change due to heat, a hot forming process may be omitted, and the real material may be directly fed to a molding process which will be described later. Hereinafter, in the present specification, a real material semi-finished product immediately after passing through the hot forming process or immediately before being fed to the molding process is referred to as a “real material layer.”
Next, the double molding process of
The molding machine for implementing a liquid-phase reactive curing method according to the present invention includes: a movable plate 100; a movable mold 100A which is integrated with the movable plate 100; a fixed plate 102; a fixed mold 102A which is integrated with the fixed plate 102 and extends to face the movable mold 100A; and a rotatable mold 200 which is interposed between the movable mold 100A and the fixed mold 102A. The rotatable mold 200 includes two split molds 200A and 200B which have the same shape and form the back surface of the real material 110.
A first head 104 is disposed through the side surfaces of the fixed plate 102 as a nozzle. The inner end of the first head 104 communicates with a first cavity 110 and is connected to a first flow path 106 passing through the fixed mold 102A, having a small diameter and being slender, and the outer end of the first head 104 is connected to a screw device (not shown). Accordingly, a solution discharged by a hopper (not shown) is extruded through a screw and fed to the first cavity 110 through the first head 104 and the first flow path 106. The solution may be a solution of any one of polycarbonate (PC), polyimide (PI), polyethersulfone (PES), polyarylate (PAR), polyethylene naphthalate (PEN), polyethyleneterephthalate (PET), cycloolefin copolymer, acrylic, acrylonitrile butadiene styrene (ABS), acrylonitrile styrene acrylate (ASA), polybutylene terephthalate (PBT), styrene acrylonitrile (SAN), etc. as long as it can form a plastic resin.
A second flow path 112 having a small diameter is installed in a passage extending from the side surface of the movable mold 100A to a second cavity 210, and a second head 108 is disposed through the side surface, communicating with the second flow path 112, as a nozzle. Solutions are fed to the second head 108 from an isocyanate tank (not shown) and a polyol tank (not shown), a mixture of the solutions forms a polyurethane (PUR) solution, and the polyurethane solution is fed to the second flow path 112. Amine is fed in place of polyol, and then polyurea PUA may be fed. PUR has excellent insulation and waterproof performance, waterproof performance, easy processability and workability, and excellent adhesion to a base material.
PUA has excellent heat resistance, excellent adhesion to a base material, is as fast as curing time is several seconds, and has excellent strength and elasticity.
Thereafter, as a work method, in the above-described molding machine, the real material layer 10 having passed through the process of
Thereafter, the rotatable mold 200 is rotated in the shown arrow direction over 180 degrees by using the space obtained by linearly moving the movable plate 100 and the movable mold 100A to the left, as shown in
In the process of the present invention, the first head 104 melts and feeds thermoplastic resin and is thus heated to a high temperature equal to or higher than 200°, and the second head 108 feeds a material in a liquid state within the temperature range of 40 to 90° C. The liquid material is fed between the real material layer 10 and the cavity 210, fills empty space, and is then cured, thereby utilizing an advantage in which the liquid-phase reactive process is rapid.
Furthermore, the shape and size of the composite layer may be precisely determined by changing the shape of the molds and the cavities, and thus the disadvantages of the spray coating method and the compression molding method can be eliminated at once.
The work flow of the double molding process in the above molding machine will be described with reference to
First, a real material layer 10 is mounted in the molding machine at step S14, and a plastic resin layer is formed on the bottom surface of the real material layer 10 through a first injection process at step S15. A new real material layer 10′ is received and mounted in the molding machine at step S20, and a PUA or PUR layer 20 is formed on the top surface of the real material layer 10 through a second injection process at step S16 and, simultaneously, a plastic resin layer is formed on the bottom surface of the real material layer 10′ through a first injection process at step S22. The real material layer 10 in which a composite layer is formed is completed as a real material product and then separated at step S30. The new real material layer 10′ enters a standby state for a second injection process, and another new real material layer is fed and enters a standby state for a first injection process.
In the present invention, the PUA or PUR layer formed on the top surface of the real material layer 10 is advantageous in that it has excellent durability, is not sensitive to changes in temperature and pressure, and can highlight the naturalness and beauty of the real material through a glossy or matte treatment.
As described above, the present invention simultaneously forms the a plastic resin layer 12 and the polyurethane or polyurea layer 20 on the first surface and the second surface, respectively, around the real material layer 10 by applying the simultaneous molding process to the real material, thereby rapidly and precisely manufacturing a product having a composite layer.
The molding process of the present invention may be modified as follows:
Although the typical molds are assumed in the foregoing description, a three-dimensional volume may be imparted, a glossy layer for gloss may be formed, or a color may be imparted, by using pattern molds.
Moreover, in order to allow PUA and PUR liquid to be desirably adhered to the real material layer 10, plasma or primer preprocessing or both plasma preprocessing and primer preprocessing may be performed on the top surface of the real material layer 10 after the real material hot forming process S12 of
According to the present invention, an esthetic appearance can be implemented regardless of the roughness of a material because the thickness of the coating layer can be adjusted by adjusting the space of the molds in the injection molding process, and various designs can be implemented on the surfaces of the molds through glossy or matte treatment, patterning, or the like.
Furthermore, according to the present invention, liquid-phase curing molding is completed through a simultaneous injection molding process, and thus the overall process is simplified, so that yield rate is high, quality is improved, manufacturing cost can be reduced, and a three-dimensional pattern can be maximized.
Although the preferred embodiments of the present invention have been described as examples above, these embodiments are merely examples and do not limit the scope of the present invention. Various modifications may be made to the present invention, and all these modifications fall within the scope of the present invention. The scope of the present invention is defined only by the attached claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2018-0157213 | Dec 2018 | KR | national |
