KR101362420B1 - Method of coating a sheet - Google Patents

Abstract

The present invention relates to a sheet coating method, and more particularly, to provide a sheet coating method, which can perform a coating process for a sheet produced by extrusion molding in one chamber. To this end, the sheet coating method according to the present invention comprises the steps of preparing a first evaporator and a second evaporator; Mounting a sheet in a chamber having an ion gun and a resistive heating evaporator having the first evaporation source and the second evaporation source; Accelerating ions released from the mobile gun to the sheet surface to roughen the sheet surface; Moving and depositing a scratch preventing deposition material evaporated from the first evaporator placed in the resistive heating evaporator onto the sheet surface; And depositing a water-repellent water repellent material on the deposition material, evaporated from the second evaporation source placed in the resistive heating evaporator.

Description

Sheet coating method {METHOD OF COATING A SHEET}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of coating the surface of a sheet, and more particularly, to a method of coating a material for preventing scratches on the surface of a sheet used for protecting a display portion of an electronic product such as a mobile phone.

Electronic products such as mobile phones, PMPs, digital cameras or TVs are provided with a display unit for outputting various information, and a sheet for protecting the display unit is attached to the display unit. This sheet is used not only for protecting the display unit before the product is sold, but also for protecting the display unit even in a state where the product is sold and used for a user.

On the other hand, the display unit of the mobile phone performs not only a function of an output unit for outputting various information, but also a function of an input unit for inputting various control signals. That is, the display unit of mobile phones, which are recently developed and sold, is configured as a touch screen to perform a function of an input unit. In addition, since the display unit of the mobile phone is directly exposed to the outside, it is likely to be in contact with various external structures.

Therefore, among the above-mentioned electronic products, especially mobile phones, since the sheet is sold or used while the sheet is attached to the display unit, the sheet performs an important function.

1 is a flowchart illustrating a conventional sheet coating method.

Sheets as described above used to be attached to the display portion of the mobile phone is generally made of a transparent synthetic resin, the surface is coated with various materials for the purpose of scratch prevention and the like.

That is, in the conventional sheet coating method, first, a sheet is manufactured by extrusion molding a transparent synthetic resin (S1).

The manufactured sheet is transported along a line in a state where it is mounted on a jig and then introduced into a UV coating chamber, and then undergoes a UV coating process (S2). The UV coating process is a process of applying a UV curable resin to the surface of the sheet using a spray and then drying the UV curable resin using ultraviolet (UV). This UV coating process is carried out for the purpose of preventing scratches from occurring on the surface of the sheet. That is, the UV curable resin is applied to the surface of the sheet, whereby scratches can be prevented.

After the UV coating process, the sheet is again transferred along the line and introduced into the water repellent coating chamber, and undergoes a water repellent coating process (S3). The water repellent coating process is a process of applying a water repellent material such as fluorine on the surface of the sheet to prevent water droplets from forming on the surface of the sheet.

Finally, the sheet that has undergone the water repellent coating process is transferred to a drying chamber, dried for a predetermined time, and then discharged.

The conventional sheet coating method as described above has the following problems.

First, in the conventional sheet coating method, since the UV curable resin is sprayed onto the surface of the sheet produced by extrusion molding and then dried by UV lamp, it is generated when spraying paint (UV curable resin). Hazardous gases may cause environmental pollution.

Second, the conventional sheet coating method requires a large working space and a lot of equipment since the UV coating process S2 and the water repellent coating process S3 are performed in separate chambers. These workspaces and equipment are increasing the manufacturing cost of sheets.

The present invention has been proposed in order to solve the above problems, and to provide a sheet coating method, which can perform a coating process for a sheet produced by extrusion molding in one chamber as a technical problem.

Sheet coating method according to the present invention for achieving the above technical problem, the step of preparing a first evaporation source and a second evaporation source; Mounting a sheet in a chamber having an ion gun and a resistive heating evaporator having the first evaporation source and the second evaporation source; Accelerating ions released from the mobile gun to the sheet surface to roughen the sheet surface; Moving and depositing a scratch preventing deposition material evaporated from the first evaporator placed in the resistive heating evaporator onto the sheet surface; And depositing a water-repellent water repellent material on the deposition material, evaporated from the second evaporation source placed in the resistive heating evaporator.

The present invention can simplify the manufacturing process by performing the coating process for the sheet produced by extrusion molding in one chamber.

Since the present invention coats the surface of the sheet using a resistive heating deposition method, it is possible to fundamentally block harmful gases generated during spray injection.

1 is a flow chart of one embodiment showing a conventional sheet coating method.
Figure 2 is an embodiment configuration of a sheet coating apparatus to which the sheet coating method according to the present invention is applied.
3 is a flowchart of one embodiment of a sheet coating method according to the present invention;
Fig. 4 is an example of an evaporation source applied to the resistance heating type evaporator shown in Fig. 2; Fig.

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

2 is a configuration diagram of an embodiment of a sheet coating apparatus to which the sheet coating method according to the present invention is applied.

As shown in FIG. 2, the sheet coating apparatus to which the sheet coating method according to the present invention is applied comprises an ion gun 20 for roughening the surface of the sheet 10 to be coated, a deposition material for scratch prevention, or water repellency. A resistive heating evaporator 30 for depositing a water repellent material on the surface of the sheet, a support 50 for supporting the sheet to be coated, and a chamber 60 forming a space in which the deposition process is performed.

First, the ion gun 20 performs a function of roughening the surface of the sheet 10 so that the deposition material to be deposited on the surface of the sheet can be better deposited on the surface of the sheet 10 to prevent scratching. do.

For example, the ion gun 20 changes argon (Ar), which is one of the inert gases, into a plasma state, and then extracts and accelerates the cations of argon to accelerate the surface of the sheet 10. When the cations of the accelerated argon collide with the surface of the sheet 10 at high speed, grooves of a predetermined depth are formed on the surface of the sheet. When a plurality of argon cations continuously hit the surface of the sheet 10 at high speed, the sheet surface is roughened by the plurality of grooves. In this state, when the deposition material for scratch prevention reaches the sheet surface, the deposition material is deposited in close contact with the groove formed on the sheet surface. That is, the groove formed on the surface of the sheet improves the adhesion between the surface of the sheet and the vapor deposition material.

Next, as the resistance heating evaporator 30 heats the evaporation source 32, the evaporation material evaporated from the evaporation source is guided to the surface of the sheet 10 and deposited on the surface of the sheet 10. To this end, the resistance heating evaporator 30 is composed of a boat 31 containing an evaporation source 32, as shown in Fig. As the boat 31 is heated, the evaporation source 32 contained in the boat is heated, and the evaporation material evaporated from the heated evaporation source 32 moves to the surface of the sheet 10 through the internal space of the chamber 60. , Is deposited on the sheet surface. As the evaporation material evaporated by the resistive heating evaporator 30 and deposited on the surface of the sheet, UV curable resin or thermosetting resin may be applied.

In addition, the resistive heating evaporator 30 may be used for depositing a water repellent material on the surface of the sheet on which the deposition material is deposited.

Next, the support 50 is for supporting the sheet 10 to be coated, and is disposed on the top of the chamber 60, as shown in FIG. 2. That is, the ion gun 20 and the resistive heating evaporator 30 are located at the bottom or side of the chamber 60, and the support 50 is disposed on the top of the ion gun 20 and the resistive heating evaporator 30. Support 50 may be configured to rotate seat 10.

Finally, the chamber 60 contains the components as described above, and in particular is kept in a vacuum state by means of a vacuum pump not shown.

Hereinafter, with reference to Figures 2 to 4, the sheet coating method according to the present invention will be described in detail.

3 is a flowchart illustrating an embodiment of the sheet coating method according to the present invention, and FIG. 4 is an exemplary view of an evaporation source 32 applied to the resistive heating evaporator shown in FIG. 2.

Sheet coating method according to the invention is as follows.

First, to prepare a sheet to be coated (S102), it is mounted on the support 50 of the sheet coating apparatus as shown in FIG. As described above, the sheet 10 may be manufactured by extrusion molding a synthetic resin material.

Next, the ion gun 20 of the sheet coating apparatus is driven to roughen the surface of the sheet 10 (S104). That is, the ion gun 20 may be used in the subsequent process of the sheet 10 so that the deposition material to be deposited on the surface of the sheet to prevent scratching is better deposited on the surface of the sheet 10. It performs the function of roughening the surface. To this end, the ion gun 20 converts an inert gas (argon (Ar), etc.) into a plasma state, and then extracts and accelerates cations of the inert gas, thereby accelerating toward the surface of the sheet 10.

Next, the resistive heating evaporator 30 is driven to deposit a scratch preventing deposition material on the surface of the sheet 10 (S106). To this end, the resistive heating evaporator 30 heats the boat 31 containing the first evaporation source 32, and deposits evaporation material evaporated from the heated first evaporation source 32 on the surface of the sheet 10. do.

Here, since the UV-curable resin or thermosetting resin used as the deposition material is generally large in particle size, the evaporation source of the dough type used in the general resistance heating evaporator cannot be used.

That is, in general, the deposition material used in the resistive heating evaporator 30, since the particles are small, may be composed of a kneading evaporation source, when the kneading evaporation source is heated in the boat 31, is deposited from the evaporation source The material easily evaporates and moves in the sheet direction.

However, the vapor deposition material applied to the present invention, as described above, is applied to the UV-curable resin or thermosetting resin having a large particle size, when composed of the evaporation source in the form of dough, even if heated, it is not easily evaporated from the evaporation source. Accordingly, the present invention manufactures the first evaporation source 32 through the process as shown in FIG.

As shown in FIG. 4, the first evaporation source 32 is made of metal (copper), alumina, or ceramic, and has a target 32a in which fine pores 32b are formed in a micrometer (μm) unit. And a deposition material 32c impregnated in the pores formed in the target.

When the target 32a is manufactured using metal or ceramic, fine pores 32b may be formed by a method of injecting air or the like.

The target 32a on which the fine pores 32b are formed is immersed in a vessel in which the deposition material 32c in the liquid state is contained. Thus, the deposition material contained in the vessel is impregnated into the pores 32b of the target 32a, thereby obtaining a first evaporation source 32 impregnated with the deposition materials.

When the first evaporator 32 manufactured as described above is placed on the boat 31 and heated, the first evaporation materials impregnated in the pores 32b of the first evaporator 32 are evaporated to the surface of the sheet 10. It is moved and adhered to the sheet 10 surface and then deposited on the sheet surface while cooling.

Next, the resistive heating evaporator 30 is driven to deposit a water repellent material on the surface of the sheet 10 on which the deposition material is deposited (S106). To this end, the resistive heating evaporator 30 heats the boat 31 containing the second evaporation source 32, and the water-repellent material vaporized from the heated second evaporation source 32 is deposited on the surface of the sheet 10. do. Fluorine (F) may be used as the water repellent material. Water repellency is intended to prevent water from penetrating into the sheet or forming on the surface of the sheet. When water repellent material is deposited, even if water droplets fall on the surface of the sheet, it may be easily separated from the surface of the sheet.

Here, the water-repellent material such as fluorine is smaller in particle size than the deposition material such as UV-curable resin or thermosetting resin used for scratch prevention. Therefore, the water repellent material can be prepared and used as the evaporation source in the form of dough.

That is, the water-repellent material is placed in the boat 31 in a state of being manufactured with a second evaporation source in the form of a dough mixed with other materials, and is evaporated when the second evaporation source 32 placed on the boat is heated to form a second evaporation source ( 32). The evaporated water repellent material is deposited on the surface of the sheet on which the deposition material is deposited as described above.

However, the water repellent material may be evaporated in the state impregnated into the pores 32b formed in the target 32a, as the deposition material described with reference to FIG. 4. That is, as shown in FIG. 4, the second evaporation source including the water repellent material may be composed of the target 32a in which the pores 32b are formed and the water repellent material impregnated in the pores 32b.

On the other hand, in the present invention, since the above-described water-repellent material deposition step (S108) is carried out in a semi-dry state of the deposition material, it has a feature that the adhesion between the water-repellent material and the deposition material is excellent.

That is, the deposition material deposition process (S106) using the resistive heating evaporator 30 is performed at a high temperature. After the deposition material deposition process (S106) is performed, the resistive heating evaporator 30 is operated in the same chamber 60. By using the water repellent material deposition process (S108) is made. Therefore, since the water-repellent material is deposited on the deposition material in a state where the deposition material is semi-dried, the adhesion between the deposition material and the water-repellent material is superior to the adhesion when the water-repellent material is deposited on the completely dried deposition material.

Finally, the sheet coating process is terminated by UV or thermosetting the sheet on which the water repellent material is deposited (S110).

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

10 sheet 20 ion gun
30: resistive heating evaporator 50: support 60: chamber

Claims (3)

Preparing a first evaporator and a second evaporator;
Mounting a sheet made of synthetic resin in a chamber having an ion gun and a resistive heating evaporator having the first evaporation source and the second evaporation source;
Accelerating ions released from the mobile gun to the sheet surface to roughen the sheet surface;
A scratch resistant deposition, evaporated from the first evaporation source, made by dipping a target consisting of a metal or ceramic and having pores formed therein into a vessel containing a liquid deposition material, so that the deposition material is impregnated in the pores. Transferring material to the sheet surface to deposit; And
Depositing a water-repellent water repellent material, evaporated from the second evaporation source placed in the resistive heating evaporator, on the deposition material in a state in which the deposition material is semi-dried;
The deposition material is a sheet coating method, characterized in that the UV curable resin or thermosetting resin. delete delete

Images