KR20200023067A - A method for forming the plastic sheet having high hardness coaing layer - Google Patents

Abstract

The present invention relates to a sheet material forming method having a high hardness coating film, which is capable of forming a plastic sheet material in various shapes without damage or breakage on the high hardness coating film for the sheet material having the high hardness coating film on one surface. The sheet material forming method having a high hardness coating film according to the present invention includes: a step 1) of preheating a plastic sheet material, on which a high hardness coating film is formed, by heating the plastic sheet material at a preheating temperature; a step 2) of loading the plastic sheet material preheated in the previous step at a first molding position on a first lower mold having a lower mold shape formed thereon; a step 3) of heating the plastic sheet material at a molding temperature by lowering and coupling an upper mold onto the first lower mold where the plastic sheet material is loaded, and performing a primary vacuum molding of the plastic sheet material into the shape of the lower mold by using a primary vacuum molding unit formed in the first lower mold; a step 4) of moving the first lower mold to a second molding position while maintaining the same temperature of the plastic sheet material; a step 5) of performing secondary molding and primary cooling on the plastic sheet material while pressing the upper part of the first lower mold to a sheet moving unit in a state of maintaining the first cooling temperature at the second molding position; and a step 6) of moving the plastic sheet material secondarily molded and primarily cooled in the previous step to a cooling jig and then, cooling the plastic sheet material to a secondary cooling temperature.

Description

Plastic sheet molding method with high hardness coating film {A METHOD FOR FORMING THE PLASTIC SHEET HAVING HIGH HARDNESS COAING LAYER}

The present invention relates to a sheet material molding method, and more particularly, to a plastic sheet material having a high hardness coating film formed on one surface thereof, a high hardness coating film capable of forming the sheet material into various shapes without damaging or breaking the high hardness coating film. It relates to the formed sheet material molding method.

Recently, the use of various mobile devices including smart phones is exploding worldwide based on wireless communication technology. Accordingly, electronic companies around the world have developed and supplied various mobile devices to cope with the explosive demand growth, and these mobile devices are changing and evolving as the wireless communication method evolves.

Currently, advanced nations including Korea are preparing to introduce 5G wireless communication technology, and plan to start commercialization service from 2019.

However, when the 5th generation wireless communication technology is fully introduced, metal cover materials currently used in mobile devices are difficult to use, and development of plastic materials that can replace them is required.

Therefore, various attempts have been made to develop plastic cover materials having mechanical properties such as sufficient strength and hardness as metal cover materials, but there are no commercialized technologies.

The technical problem to be solved by the present invention is a sheet material forming method in which a high hardness coating film is formed to form the sheet material in various shapes without damage or cracking of the high hardness coating film with respect to the plastic sheet material formed with a high hardness coating film on one surface To provide.

Sheet material forming method formed with a high hardness coating film according to the present invention for solving the above technical problem, 1) heating the plastic sheet material on which the high hardness coating film is formed to a preheating temperature; 2) loading the plastic sheet material preheated in the previous step at the first molding position onto a first lower mold having a lower mold shape thereon; 3) While the upper mold is lowered onto the first lower mold loaded with the plastic sheet material, the upper mold is fastened to heat the plastic sheet material to a molding temperature, and the plastic is formed by using a first vacuum forming part formed in the first lower mold. Primary vacuum forming a sheet material into the lower mold shape; 4) moving the first lower mold to a second molding position while maintaining the same temperature of the plastic sheet material; 5) secondary molding and primary cooling of the plastic sheet material while pressing the upper portion of the first lower mold with a sheet moving part while maintaining the first cooling temperature at the second molding position; And 6) moving the plastic sheet material, which was secondary molded and primary cooled in a previous step, to a cooling jig and then cooled to a secondary cooling temperature.

In the present invention, step 3) may include: a) forming a molding space by fastening the upper mold and the first lower mold; b) heating the temperature inside the molding space to a molding temperature to make the plastic sheet material deformable; c) It is preferable to proceed by dividing into the small steps of; primary suction forming the plastic sheet material in a contactless manner by vacuum suction the plastic sheet material to the lower portion using the primary vacuum forming unit.

In addition, the step 4) in the present invention, d) raising the upper mold while maintaining the temperature of the first lower mold the same; e) rotating the first lower mold to move from the first molding position to the second molding position, and simultaneously moving the second lower mold disposed at a position opposite to the first lower mold to the first molding position; It is preferable to proceed to the small step of;

In addition, in the present invention, step 5) may include f) coupling the sheet moving part having an upper mold shape formed on a lower surface thereof to the upper surface of the first lower mold; g) pressing the plastic sheet material with the sheet moving part while maintaining the plastic sheet material at a first cooling temperature, and simultaneously performing vacuum molding using the first vacuum molding part to perform secondary molding; It is preferable to proceed by dividing into steps.

In addition, the step 6) in the present invention, h) using the sheet moving unit to move the plastic sheet material to the cooling jig; i) Cooling the plastic sheet material to a secondary cooling temperature in a state in which the sheet moving unit and the cooling jig are combined, it is preferable to proceed in a small step of.

According to the sheet material forming method of the present invention, the sheet material is formed without damage or breakage of the high hardness coating film with respect to the plastic sheet material on which the high hardness coating film is formed while using minimal energy by heating and controlling temperature of the individual sheet material on one surface. Significant effects that can be molded into various shapes can be achieved.

1 is a view showing the structure of a sheet material according to an embodiment of the present invention.
2 is a process chart showing a process of the sheet material forming method according to an embodiment of the present invention.
3 is a process chart showing a detailed process of the primary vacuum forming process according to an embodiment of the present invention.
4 is a flowchart showing a detailed process of a movement process to a second molding position according to an embodiment of the present invention.
FIG. 5 is a flowchart illustrating detailed processes of a secondary molding and a primary cooling process according to an embodiment of the present invention.
6 is a view showing the structure of each component of the sheet material forming apparatus according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail a specific embodiment of the present invention.

The sheet material molding method in which the high hardness coating film is formed according to the present exemplary embodiment is started by preparing a sheet material (S100), as shown in FIG. 2. In the present embodiment, the material 1 to be molded is a sheet material having a thin plate shape as a whole as shown in FIG. 1, and may be made of plastic of various materials. The plastic sheet material 1 is manufactured in the form of a roll and cut and prepared in a required size and shape. Therefore, although FIG. 1 illustrates a rectangular shape, it may be prepared in various other shapes.

In this case, as shown in FIG. 1, a high hardness coating film 2 is formed on one surface of the sheet material 1. Here, the high hardness coating film 2 refers to a coating film having a hardness of pencil hardness of 5H or more. And the other surface of the sheet material 1, as shown in Figure 1, other functional film 3, such as a printed layer, a conductive layer may be formed. In this embodiment, the molding process is performed in such a state that the surface on which the high hardness coating film 2 is formed is set to face downward in the sheet material.

In addition, the sheet material 1 is prepared in a state in which a plurality of sheets are vertically stacked in a magazine, and as shown in FIG. 6, the top sheet material is always the same in a state in which a plurality of sheets are stacked in a magazine 112. It is preferable to feed the sheet material while raising and lowering the magazine to be located at a height.

Next, as shown in FIG. 2, the step S200 of preheating the sheet material is performed. In this step (S200), as shown in FIG. 6, the sheet material is heated to the preheating temperature with respect to the sheet material 1 while being placed on the preheating jig 120. In the molding method according to the present embodiment, the sheet material 1 is formed in a state in which the sheet material is heated to a molding temperature at which the sheet material can be freely deformed. Is heated to a preheating temperature lower than the molding temperature.

Meanwhile, in this embodiment, in the preheating step S200, an alignment step of changing the position of the sheet material finely may be further performed to determine the correct loading position of the sheet material 1 during preheating. have.

Next, as shown in FIG. 2, the first vacuum forming of the sheet material is performed (S400). Of course, the step (S300) of loading the sheet material to the first molding position where the primary molding is performed before the first vacuum forming step S400 should be further performed. That is, in this step (S300), the sheet material 1 aligned and preheated to the correct position in the preheating step (S200) is moved as it is without changing its position to the primary molding part 140.

In the first vacuum forming step (S400), a step of forming a molding space by lowering the upper mold 144 in a state in which the preheated sheet material is seated on the lower mold 142 at the first molding position P1. (S410), the step of heating the inside of the closed molding space to a molding temperature to form a freely deformable state (S420), and vacuum suction from the lower side of the sheet material to deform into a lower mold (142) shape ( It is preferable to proceed by dividing into small steps of S430).

Thus, when primary molding is performed by heating and vacuum suction method for individual sheet materials, precise temperature control is possible while using minimal energy, and the sheet material is a hard coating film due to sag caused by its own weight and natural deformation by vacuum suction. There is an advantage that can be molded in a state that does not damage.

Next, as shown in FIG. 2, the step S500 of moving the primary vacuum-formed sheet material to the second molding position P2 is performed. In the present embodiment, the lower mold 142 in the first vacuum forming step (S400) and the lower mold 162 in the second forming step (S600) are very precise in the state in which the sheet material is seated in the process progress. Temperature control should be carried out so that the temperature of the sheet material does not change so that the sheet material, in particular, the hard coating film is not damaged.

Therefore, in the step S500, as shown in FIGS. 4 and 6, only the upper mold 144 is raised at the first molding position P1 without moving the sheet material between the primary molding position and the secondary molding position. In step S510, the lower mold 142 at the primary molding position P1 is rotated and moved as it is to the secondary molding position P2, and at the same time, the lower mold at the secondary molding position P2 is primary-molded. It is preferable to proceed by dividing into the small steps of the step (S520) to rotate and return to the position (P1).

Next, as shown in FIG. 2, the step of pressing the sheet material to secondary molding and cooling to the primary cooling temperature (S600) is performed. That is, in this step (S600) to receive the primary molded sheet material in the first vacuum forming step (S400) and pressurized while maintaining the molding temperature to secondary molding, the final molded sheet material is first cooled will be.

To this end, as shown in FIG. 5, the step S600 may include the sheet moving part 180 provided with the upper mold 164 in a state in which the first molded sheet material is seated on the lower mold 142. A step (S610) of coupling to the lower mold 142, the step of pressing the sheet material using the sheet moving unit 180 to finally form the sheet material (S620), and the second molding is completed In order to prevent the re-deformation of the sheet material is preferably divided into small steps of the primary cooling step (S630) for cooling below the molding temperature for the molded sheet material.

On the other hand, in the second molding process for the sheet material in the present embodiment, it is preferable that the pressing by the sheet moving part 180 and the vacuum molding by the vacuum suction force are simultaneously performed.

Next, as shown in FIG. 2, the step S700 of moving the sheet material secondary molded in the previous step S600 to the secondary cooling unit 170 and cooling to the secondary cooling temperature is performed. In this step (S700), uniform and complete secondary cooling is performed on the entire primary cooled molded sheet material only to the extent that no deformation occurs during movement.

Finally, as shown in FIG. 2, in step S700, a step S800 of discharging the second cooled sheet material to the outside is performed. In this step (S800) it is discharged safely to the outside continuously the sheet material is completed molding.

In the present embodiment, it is preferable that the process management is advantageously performed in the housing from which the outside air is blocked from the preheating step S200 to the second cooling step S700.

1: sheet material 2: high hardness coating film
3: functional membrane
100: plastic sheet material molding system according to an embodiment of the present invention
110: sheet material laminated portion 120: preheating portion
130: first sheet supply portion 140: primary molding portion
150: second sheet supply part 160: secondary molding part,
170: secondary cooling unit 180: discharge unit
190: second sheet moving part

Claims (5)

1) preheating by heating the plastic sheet material having a high hardness coating film to a preheating temperature;
2) loading the plastic sheet material preheated in the previous step at the first molding position onto a first lower mold having a lower mold shape thereon;
3) While the upper mold is lowered onto the first lower mold loaded with the plastic sheet material, the upper sheet is fastened to heat the plastic sheet material to a molding temperature, and the plastic is formed by using a first vacuum forming part formed on the first lower mold. Primary vacuum forming a sheet material into the lower mold shape;
4) moving the first lower mold to a second molding position while maintaining the same temperature of the plastic sheet material;
5) secondary molding and primary cooling of the plastic sheet material while pressing the upper portion of the first lower mold with a sheet moving part while maintaining the first cooling temperature at the second molding position;
6) The method of forming a plastic sheet formed with a high-hardness coating film, comprising: moving the plastic sheet material subjected to secondary molding and primary cooling in a previous step to a cooling jig and then cooling to a secondary cooling temperature.
The method of claim 1, wherein step 3)
a) fastening the upper mold and the first lower mold to form a molding space;
b) heating the temperature inside the molding space to a molding temperature to make the plastic sheet material deformable;
c) a high hardness coating film, characterized in that it is divided into the small steps of the step of primary molding the plastic sheet material in a contactless manner by vacuum suction of the plastic sheet material to the lower portion using the primary vacuum forming unit; Formed plastic sheet molding method.
The method of claim 2, wherein step 4)
d) raising the upper mold while maintaining the same temperature of the first lower mold;
e) rotating the first lower mold to move from the first molding position to the second molding position, and simultaneously moving the second lower mold disposed at a position opposite to the first lower mold to the first molding position; Plastic sheet molding method formed with a high hardness coating film, characterized in that the step of proceeding; The method of claim 3, wherein step 5)
f) coupling the sheet moving part having an upper mold shape on a lower surface thereof to the upper surface of the first lower mold;
g) pressing the plastic sheet material with the sheet moving part while maintaining the plastic sheet material at a primary cooling temperature, and simultaneously performing vacuum molding using the primary vacuum molding part to perform secondary molding; Plastic sheet forming method formed with a high hardness coating film, characterized in that divided into steps. The method of claim 4, wherein step 6)
h) moving the plastic sheet material to the cooling jig using the sheet moving part;
i) cooling the plastic sheet material to a secondary cooling temperature in a state in which the sheet moving unit and the cooling jig are combined;

Images