KR20050095670A - Manufacturing method of zinc sulfide metallized film - Google Patents

Abstract

According to the present invention, zinc sulfide is deposited on at least one surface of a polyester film at a vacuum degree of 10 ^-4 to 10 ^-5 torr and a deposition rate of 40 to 80 m / min using a high-frequency induction heating vacuum evaporator having a crucible evaporation source made of graphite. A method of manufacturing a zinc sulfide-deposited polyester film by a deposition method is provided. As described above, a polyester film in which zinc sulfide is deposited by controlling a voltage and a deposition rate of a crucible using a vacuum deposition method has various iridescent colors in the width direction. The color can be expressed to satisfy the visual needs of consumers.

Description

Manufacturing method of zinc sulfide-deposited polyester film {Manufacturing method of zinc sulfide metallized film}

The present invention relates to a method of manufacturing a zinc sulfide-deposited polyester film, and more particularly, to manufacturing a polyester film in which zinc sulfide is deposited to express various colors by controlling the crucible voltage and the deposition rate using a vacuum deposition method. It is about a method.

Recently, a deposition film which has undergone aluminum deposition or a printing process on a polyethylene terephthalate (hereinafter referred to as PET) film has been used as various packaging materials.

Consumers tend to increase their preference for visually beautiful products as their living standards improve.

Conventionally, the PET film has been printed on the screen for visual effects. In order to display color through a printing process, a corona treatment or chemical coating process is required on a film as a base material, and in order to display various colors, a plurality of printing processes have to be performed.

On the other hand, zinc sulfide (ZnS) thin film may be formed. In this case, although the color is different from that of aluminum deposition, it shows a single color and the visual effect was not satisfactory.

Accordingly, the present inventors, while exploring a method of depositing a zinc sulfide thin film and exhibiting a variety of colors, when the zinc sulfide is deposited on a polyester film, as a result of adjusting the voltage and deposition rate of the crucible, The present invention has been completed by knowing that a polyester film having high transparency from side to side and rainbow colors in the width direction based on the part can be obtained.

Accordingly, it is an object of the present invention to provide a method for producing a polyester film which can satisfy the visual needs of consumers by exhibiting high transparency and iridescent based on the vacuum deposition method.

Method for producing a polyester film of the present invention for achieving the above object is a vacuum degree using a vacuum evaporator having a crucible evaporation source made of graphite on at least one surface of the polyester film 10 ^-4 ~ 10 ^-5 torr , Characterized in that it is carried out by a method of depositing zinc sulfide at a deposition rate of 40 to 80m / min.

The present invention will be described in more detail as follows.

The deposition of zinc sulfide in the present invention is carried out using a vacuum resistance deposition method on a plastic film, specifically a PET film.

Looking at the basic principle of the film deposition method carried out in the present invention, the vacuum deposition method was first performed by Faraday in 1857, this method can be said to be the most widely used method of thin film manufacturing method.

A method of forming a thin film by heating and evaporating a metal, a metal compound or an alloy in a vacuum to attach the evaporated metal or the evaporated metal compound to a surface of a target substance, is called a vacuum deposition method.

The evaporation process is different from sputtering in that it is a heat exchange process.

The manufactured thin film materials include metals, alloys, and nonmetal oxides, and the functions and properties of these thin films are very diverse, and the range of use is rapidly spreading in various directions according to the trend of miniaturization, light weight, and super integration of devices.

Looking at the principle of vacuum deposition, the resistance heating vacuum deposition method requires heat sources such as filaments, baskets, boats, etc., which are particularly well-used, and particularly popular thermal sources are W, Mo, Ta, etc. Make foil or wire of field into proper shape and use it as evaporation source. It is a method of evaporating a material by placing a deposition material and heating a current through an evaporation source. This is advantageous for the deposition of materials with low melting points, and the deposition rate can be controlled by controlling the amount of current supplied to the filament, and wound on the filament or placed on a basket or boat and flowing current through the electrodes on both sides. The heat of electrical resistance is maximized to deposit. The evaporation source material should be selected in consideration of the vapor pressure, because it causes a reaction or diffusion to form a compound or an alloy. If the alloy is formed, the melting point is lowered and the evaporation source is easy to break.

Therefore, the material of the evaporation source should be selected a combination which cannot be alloyed, and when it is difficult, the temperature of the evaporation source should be lowered, or the amount of evaporation source material should be much larger than the amount of thin film material to suppress the consumption of the evaporation source at all. In the vacuum deposition method using the heat of electric resistance, it is preferable to increase the thermal contact with the area of the deposition source so that the amount of current supplied can be sufficiently transferred to the deposition material. This method can use deposition sources of various sizes and shapes. There is an advantage.

The vacuum degree required for vacuum deposition is 10 ^-4 to 10 ^-5 torr, which is high vacuum. If the vacuum is worse than this, the particles repeatedly collide with each other until the evaporated metal reaches the surface of the deposit, or the oxygen in the remaining air is increased. Higher thin films cannot be obtained due to collision with molecules and oxidation.

In order to deposit zinc sulfide on the polyester film by using the vacuum deposition method, zinc sulfide is added to the crucible, and then the crucible is heated by high vacuum to be deposited. At this time, it is preferable that the voltage of the crucible is 210 to 220V. If the voltage of the crucible is less than 210V, the crucible voltage is weak and zinc sulfide is not sublimated, so that deposition cannot be performed. The zinc sulfide particles are splashed out of the crucible by the heat and sublimation air generated during the sublimation of zinc sulfides having a small size, resulting in a large consumption of zinc sulfides.

On the other hand, in the deposition of zinc sulfide, the deposition rate of the evaporator is an important factor in producing brilliant and various colors, and the most suitable deposition rate is 40 to 80 m / min. If the deposition rate is slower than 40m / min, there is a problem that the portion of the film passing directly above the crucible is increased by the heat of the crucible, and at the deposition rate faster than 80m / min, the boundary of rainbow light disappears and various colors do not appear. have.

Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited by the Examples.

In the embodiment of the present invention manufactured by NICHIA CORPORATION, using a high frequency induction heating vacuum evaporator (ULVAC, model name EWA-105) having a crucible evaporation source made of graphite on a PET film (KOLON Co., Ltd.) 500 g of a zinc sulfide having a spherical shape of about 10 mm in diameter having a purity of 99% or more with a product name of NP-7100 was put in a crucible and subjected to high vacuum with a vacuum degree of 3.4 × 10 ^-4 torr to be deposited by heating the crucible.

Examples 1 to Comparative Examples 1 and 2

The examples are to find the heating voltage of the crucible which can deposit zinc sulfide on the PET film. As shown in Table 1 below, the deposition state was checked while changing the heating voltage condition of the evaporator crucible, and the results are shown in Table 1 below.

Crucible Voltage (V) Deposition Status Example 1 215 Good deposition Comparative Example 1 200 Not deposited Comparative Example 2 230 Zinc sulfide grains stick out of the crucible

From Table 1, when depositing at the crucible voltage of 200V as in Comparative Example 1, the zinc sulfide is not sublimed because the crucible voltage is weak, and when depositing at the crucible voltage of 230V as in Comparative Example 2, sublimation occurs, but sublimation occurs It can be seen that there is a problem that zinc sulfides that are smaller are splashed out of the crucible by heat generated during sublimation and sublimation air, thereby increasing consumption of zinc sulfides. As a result, it is preferable that the crucible voltage is 210 to 220 V in order to achieve good deposition without zinc sulfide popping out of the crucible while sublimation occurs.

Examples 2-4 and Comparative Examples 3-4

As shown in Example 1, after fixing the voltage to 215V, which is a crucible voltage in which the deposition state is good, the deposition rate is set as shown in Table 2 to find a deposition rate in which the deposition color is colorful and shows various colors. The film surface state was visually observed while adjusting, and then shown in FIGS. 1 to 5 using a digital camera.

Article Conditions Crucible Voltage (V) Torr Deposition rate (m / min) Example 2 215 3.4 × 10 ^-4 40 Example 3 215 3.4 × 10 ^-4 60 Example 4 215 3.4 × 10 ^-4 80 Comparative Example 3 215 3.4 × 10 ^-4 30 Comparative Example 4 215 3.4 × 10 ^-4 100

1 to 3 are photographs of the surface conditions of the deposited films obtained from Examples 2 to 4, respectively, and FIGS. 4 to 5 are photographs of the surface conditions of the deposited films obtained from Comparative Examples 3 to 4, respectively.

From FIG. 4, when the deposition rate is 30 m / min (Comparative Example 3), it can be seen that the film portion passing directly above the crucible is increased by the heat of the crucible.

5, when the deposition rate is 100m / min (Comparative Example 4), it can be seen that the border of the rainbow light disappears and various colors do not appear.

On the other hand from Figures 1 to 3 it can be seen that a variety of iridescent colors appear in the width direction of the film.

Therefore, it can be seen that the preferred deposition rate is about 40 to 80m / min.

In order to more easily check the color variation, the color tone was measured at 20 mm intervals in the width direction using a spectrophotometer CM-3500d manufactured by Minolta, and the results are shown in Table 3 below. The meaning of the measured data L value means the brightness of the sample, (+) a means red, (-) a means green, (+ b) means yellow, and (-) b means blue.

20 mm 40 mm 60 mm 80 mm 100 mm 120 mm 140 mm 160 mm 180 mm 200 mm Example 2 L 93.46 92.23 92.84 93.28 90.91 90.31 90.33 88.66 88.27 88.73 a -1.10 0.83 -1.57 -3.02 3.94 -2.28 0.10 4.87 -2.35 -1.74 b 7.95 2.85 2.68 10.55 6.23 8.03 12.40 8.73 13.34 11.20 Example 3 L 95.01 94.38 92.86 92.26 91.74 92.38 92.87 93.16 93.30 93.18 a -1.42 -1.94 -0.72 1.31 -0.44 -2.48 -3.08 -3.35 -3.50 -3.37 b 3.32 5.86 7.44 3.73 0.27 1.41 4.81 8.16 9.48 8.89 Example 4 L 95.10 95.28 95.03 94.89 94.64 93.96 92.96 91.24 90.84 90.88 a -1.18 -1.08 -1.01 -1.00 -1.19 -1.69 -1.10 2.36 2.69 2.15 b 1.77 1.74 2.01 2.70 4.30 7.85 10.77 6.74 3.31 2.21 Comparative Example 3 L 93.30 92.26 92.90 93.79 92.35 91.02 91.20 89.05 89.27 89.11 a -1.32 -1.56 -1.19 -2.83 1.12 -1.12 -0.37 2.84 -2.64 2.13 b 7.94 1.43 1.94 6.67 8.18 5.09 11.78 8.68 13.33 10.20 Comparative Example 4 L 94.07 94.25 94.76 94.35 94.04 93.27 92.49 92.10 92.10 92.41 a -0.95 -0.72 -0.91 -0.09 -1.46 -1.63 -1.07 -0.10 -0.06 -0.78 b 1.87 2.20 3.27 4.51 6.84 10.58 11.76 11.75 11.55 11.74

Using the results of Table 3, the profiles of a and b values in the width direction were made and shown in FIGS. 6 to 7.

Figure 6 shows the profile of the width direction a value of the film specimens according to Examples 2 to 4 and Comparative Examples 3 to 4, Figure 7 shows the profile of the b value.

Based on the results of Table 3, changes in L, a, and b values of Examples 2 to 4 and Comparative Examples 3 to 4 were calculated, and the results are shown in Table 4 below. The results in Table 4 are based on the results measured at 200 mm width.

Example 2 Example 3 Example 4 Comparative Example 3 Comparative Example 4 △ L 5.19 3.27 4.44 4.74 2.66 Δa 7.89 4.81 4.38 5.67 1.57 Δb 10.66 9.21 9.21 11.90 9.89

 From the results of FIGS. 6 to 7 and Table 4, when the deposition rate is appropriate as in Examples 2 to 4, the deviation of the a value and the b value in the width direction is large. That is, it can be seen that various colors appear in the width direction.

However, when the deposition rate is high as in Comparative Example 4, the deviation between the width a value and the b value is small. That is, it can be seen that there is little difference in color in the width direction.

As described above in detail, according to the present invention, the polyester film deposited with zinc sulfide by controlling the voltage and deposition rate of the crucible using the vacuum deposition method expresses various colors of iridescent color in the width direction to satisfy the visual needs of consumers. Can be satisfied.

1 is a photograph of the surface of the deposited film obtained in Example 2,

2 is a photograph of the surface of the deposited film obtained in Example 3,

3 is a photograph of the surface of the deposited film obtained in Example 4,

4 is a photograph of the surface of the deposited film obtained from Comparative Example 3,

5 is a surface photograph of a deposited film obtained from Comparative Example 4,

6 is a graph showing a profile of the width direction a value of the deposited films obtained from Examples 2 to 4 and Comparative Examples 3 to 4,

7 is a graph showing a profile of the width direction b value of the deposited films obtained from Examples 2 to 4 and Comparative Examples 3 to 4. FIG.

Claims (2)

On at least one surface of the polyester film, by using a vacuum evaporator having a crucible evaporation source made of graphite at a vacuum degree of 10 ^-4 to 10 ^-5 torr, zinc sulfide is deposited at a deposition rate of 40 to 80 m / min. Method for producing a zinc sulfide deposited polyester film. A zinc sulfide-deposited polyester film obtained according to the method of claim 1, wherein L, a, and b values measured within 200 mm width when the color tone is measured at 20 mm intervals in the width direction using a spectrophotometer satisfy the following equation. Δa〉 3.00, Δb〉 9.00, ΔL〉 3.00