KR100192844B1 - Method of making polyester resin film covering metal board and apparatus thereof - Google Patents

Abstract

According to the present invention, a metal plate and a polyester resin film are adhered to a metal plate by cracking and quenching in a cooling tank equipped with an ultrasonic wave generator and maintaining the crystallinity of the polyester film homogeneously in the plate width direction and the plate advancing direction. The manufacturing method and the manufacturing apparatus of the polyester resin film coating metal plate which made the adhesive force of the liver uniform and improved the storage property of the content.

The method for producing a polyester resin film-coated metal sheet of the present invention is characterized in that the polyester resin film is laminated on a metal plate and then quenched in an ultrasonic cooling bath equipped with an ultrasonic generator, wherein the quenching is performed at a predetermined distance from the laminate roll. It can be made in a plurality of ultrasonic cooling tanks installed in multiple stages.

In addition, the polyester resin film-coated metal sheet manufacturing apparatus which is another aspect of the present invention includes an ultrasonic cooling tank in which ultrasonic generators are installed on both sides of the metal plate on which the polyester resin film is laminated; A pure water supply pipe installed above the ultrasonic cooling tank so as to supply pure water to the cooling tank, the pure water supply pipe having a solenoid valve for controlling the pure water supply; It is a structure characterized by including the overflow piping connected to the ultrasonic cooling tank.

In another aspect of the present invention, a polyester resin film-coated metal sheet manufacturing apparatus includes ultrasonic generators installed at both sides of a metal plate laminated with a polyester resin film, and installed in multiple stages apart from a laminate roll by a predetermined distance. An ultrasonic cooling tank in which a slit through which a metal plate passes is formed; A cooling water storage tank installed under the ultrasonic cooling tank for storing pure water to be supplied to the cooling tank; A pure water supply pipe installed at an upper portion of the cooling water storage tank to supply pure water to the cooling water storage tank, the pure water supply pipe having a solenoid valve controlling a pure water supply; A pump installed under the cooling water storage tank to pressurize and supply the cooling water to each cooling tank from the cooling water storage tank through the cooling water pipe; It is a structure characterized by including the overflow piping extended from each ultrasonic cooling tank to a cooling water storage tank.

Description

Manufacturing method of polyester resin film coating metal plate, and its apparatus

The present invention relates to a method and apparatus for coating a polyester resin film on a metal plate, and more particularly, after bonding a polyester resin film to a metal plate, cracking and quenching in a cooling bath equipped with an ultrasonic wave generator to form a plate width. A method for producing a polyester resin film-coated metal sheet having a uniform adhesion between the metal plate and the polyester resin film and improving the storage properties of the polyester film by maintaining the crystallinity degree of the polyester film homogeneously in the direction and the plate advancing direction. will be.

In producing a polyester resin film-coated metal sheet, it is extremely important to obtain uniformly good adhesion, and cooling conditions are very important when the polyester resin film is laminated and then quenched. If the polyester resin film takes too much time to quench after laminating, or it takes too long to cool the metal plate below a certain temperature, or the temperature of the metal plate after cooling is too high, the polyester resin film laminated to the metal plate has a degree of crystallinity. The adhesion of the film is improved because is too low, but the storage of the contents is drastically reduced. Further, in the cooling method, uniformly cooling the metal plate conveyed at high speed in the width and length directions has a great influence on the adhesion, processing adhesion, and heat resistance of the laminated metal plate. Conventionally, in cooling a heated metal plate after lamination, it is quenched by using a cooling gas to 60 ° C. or lower, or quenched by 60 ° C. or lower by depositing in a water bath containing a liquid such as water, or by quenching by spraying. And the like have been used. However, the use of a cooling gas is not only costly, but also causes many inefficient factors in using a cooling gas in a certain container, and it is difficult to manage and maintain the surface of the metal plate in contact with the gas at a constant temperature. There are many problems in keeping the degree of crystallinity constant. In addition, when quenching by immersing in a bath containing liquid such as water, the heat taken from the metal plate at the interface between the metal plate and the liquid cannot be diffused quickly, and the rate of cooling the metal plate to a predetermined temperature or less is slow. In addition, the conditions such as the contact angle between the metal plate and the liquid, the contact surface, the connection time, the diffusion time, and the temperature of the cooling liquid are not constant, making it difficult to maintain the crystallinity and the amorphousness of the polyester film constantly. In addition, when spraying a solution such as water using a pump and a nozzle, a significant difference occurs in the degree of hardening and amorphousness of the polyester film depending on the spray pressure, direction, and contact area, and thus, film adhesion, processability, and contents storage property may be reduced. There is a big difference between the parts, which does not guarantee uniform product quality.

Accordingly, the present invention has been made to solve the problems of the prior art described above, and in order to produce a polyester resin film-coated metal sheet having excellent adhesion, processing adhesion, and resistance to heat (retort), a uniform cooling condition and a rapid cooling rate are provided. The purpose is to provide a method for producing a polyester resin film-coated metal sheet.

Moreover, an object of this invention is to provide the manufacturing apparatus of the polyester resin film coating metal plate provided with the ultrasonic cooling apparatus used for implementing the manufacturing method of the said polyester resin film coating metal plate.

1 is a view schematically showing an apparatus for producing a polyester resin film-coated metal sheet according to the present invention.

2 is a view schematically showing an apparatus for producing a polyester tere resin film metal plate according to the present invention, in which a plurality of ultrasonic cooling tanks are installed in multiple stages.

* Explanation of symbols for main parts of the drawings

1: Metal plate (original plate) 2: Ultrasonic vibration difference

3,3a, 3b: cooling tank 4,16: temperature measuring device

5,17 Solenoid valve 6,18 Pure water supply piping

7: overflow piping 9: pump

14: Slit 15: Cooling water storage tank

28: cooling water supply piping

In order to achieve the above object, in the present invention, in the method for producing a polyester resin film-coated metal sheet, the polyester resin film is laminated on a metal plate and then quenched in an ultrasonic cooling tank equipped with an ultrasonic generator. Provided is a method for producing a film-coated metal sheet.

Here, the quenching may be made in a plurality of ultrasonic cooling tanks installed in multiple stages at a predetermined distance from the laminate roll.

According to another aspect of the present invention, there is provided an ultrasonic cooling tank having ultrasonic generators installed at both sides of a metal plate laminated with a polyester resin film; A pure water supply pipe installed at an upper portion of the ultrasonic cooling tank to supply pure water to the cooling tank, the pure water supply pipe having a solenoid valve controlling a pure water supply; It provides a polyester resin film-coated metal sheet manufacturing apparatus characterized by having an overflow pipe connected to the ultrasonic cooling tank.

In addition, in the present invention, ultrasonic generators are installed on both sides of the metal plate laminated with the polyester resin film is moved inside each, and installed in multiple stages apart from the laminate roll by a predetermined distance, the ultrasonic cooling formed with a slit through which the metal plate can pass through Joe; A cooling water storage tank installed under the ultrasonic cooling tank for storing pure water to be supplied to the cooling tank; A pure water supply pipe installed at an upper portion of the cooling water storage tank to supply pure water to the cooling water storage tank and having a solenoid valve configured to regulate the pure water supply; A pump installed under the cooling water storage tank to pressurize and supply the cooling water to each cooling tank from the cooling water storage tank through the cooling water pipe; An apparatus for producing a polyester resin film-coated metal sheet comprising an overflow pipe extending from each ultrasonic cooling tank to a cooling water storage tank.

EMBODIMENT OF THE INVENTION Hereinafter, the manufacturing method and its apparatus of the polyester resin film coating metal plate of this invention are demonstrated in detail with reference to attached drawing which shows a preferred embodiment.

FIG. 1 schematically shows the apparatus for producing a polyester resin film-coated metal sheet according to the present invention, and FIG. 2 shows another embodiment of the apparatus for producing a polyester resin film-coated metal sheet according to the present invention, in which a plurality of ultrasonic cooling tanks are installed. It is shown.

The apparatus for producing a polyester resin film-coated metal sheet shown in FIG. 1 is provided with an ultrasonic cooling tank 3 for cooling the metal plate 1 moving between laminate rolls, and the metal plate 1 moved inside the cooling tank 3. ) Ultrasonic vibrators 2 are installed at both sides, and the temperature measuring device 4 is mounted inside the side of the cooling tank 3, and the pure water supply pipe 6 installed at the upper side of the ultrasonic cooling tank 3 is provided. Pure water is supplied through the water supply, and the supply of the pure water is controlled by the solenoid valve 5 installed in the pure water supply pipe 6 in conjunction with the temperature measuring device 4. Moreover, the overflow piping 7 is provided in the opposing side surface in which the pure water supply piping 6 of the ultrasonic cooling tank 3 was installed.

In another embodiment, the polyester resin film-coated metal sheet manufacturing apparatus shown in FIG. 2 has a plurality of ultrasonic cooling tanks 3a and 3b installed at a predetermined distance from the laminate to cool the metal sheet 1 moving between the laminate rolls (eg, Two), each of the ultrasonic cooling tank (3a, 3b) is the same as the cooling tank shown in FIG. 1, but the slits (silt) 14 for the metal plate 1 to pass through is formed, respectively, Cooling water storage tank 15 is installed at the lowermost part, and a pure water supply pipe 18 is connected to the cooling water storage tank 15, and the cooling water storage tank so as to supply cooling water to each of the ultrasonic cooling tanks 3a and 3b. The cooling water supply pipe 28 extends from the 15 through the pump 9, and the solenoid valve 17 is installed in the pure water supply pipe 18, and the temperature measuring device 16 installed inside the cooling water storage tank 15. In conjunction with the coolant reservoir The overflow pipe 7 from the supply, and the pure water 15, respectively, the ultrasonic cooling bath (3a, 3b) is arranged to extend to the cooling water storage tank 15.

Next, the manufacturing method of this invention which manufactures a resin film coating metal plate using the polyester resin film coating metal plate manufacturing apparatus of the Example of this invention as mentioned above is demonstrated.

Another aspect of the present invention is a method for producing a polyester resin film-coated metal plate, characterized in that the polyester resin film is laminated on a metal plate and then quenched in an ultrasonic cooling tank equipped with an ultrasonic generator.

In addition, the quenching may be made through a plurality of ultrasonic cooling tanks installed in multiple stages at a predetermined distance from the laminate roll.

In the present invention, pure water of 50 ° C. or less is used in an ultrasonic cooling tank (3, 3a, 3b) equipped with a vibration difference (2), which is an ultrasonic oscillation device having a frequency of 25-50 KHz, after laminating a polyester resin film. By quenching, the heated metal plate was not only cooled to crack but also rapidly spread heat taken from the steel sheet, thereby producing a polyester resin film-coated metal plate having excellent adhesion, processing adhesion, heat resistance, and the like.

In addition, even if the line speed changes, it was possible to maintain a constant cooling condition irrespective of the lie speed by installing a multi-stage ultrasonic cooling tank and interlocking with the line speed in order to make the time from lamination roll to cooling constant.

In the present invention, regardless of the line speed, in order to maintain a constant time from the laminate roll to the cooling, when the line speed is high, a cooling tank far away from the laminate roll is used instead of the cooling tank at a close distance from the laminate roll. In the case of a low temperature, on the contrary, it can always be cooled to uniform cooling conditions by operating the cooling tank installed close to the laminate roll. In addition, by adjusting the width of the slit 14 provided at the bottom of the cooling tank and the capacity of the pump 9 for supplying the cooling water to the cooling tank, the cooling water is always maintained at a constant height in the cooling tank.

Hereinafter, the present invention will be described in more detail with reference to Examples.

Example 1

The distance from the laminate roll to the cooling water interface of the ultrasonic cooling tank is 50cm and 100cm, respectively, and the first cooling tank 3a and the second cooling tank 3b with the ultrasonic oscillation frequency 25-35KHz are installed, The polyester resin is heated to 210-260 ° C. using an induction heater, and the heat-adhesive polyester resin film is bonded using a laminate roll, followed by quenching in an ultrasonic cooling bath 3a. The film coating metal plate was produced. At this time, the line speed was 15 m / min, and the distance from the laminate roll to the cooling water interface of the ultrasonic cooling bath was 50 cm. The cooling main temperature of the ultrasonic cooling tank was kept at 30-50 degreeC.

Example 2

After heating the tin-free steel in the same manner as in Example 1 in the line prepared as in Example 1, coating the polyester resin film at a line speed of 30 m / min, and then cooling the second ultrasonic wave at a distance of 100 cm from the laminate roll to the cooling water interface. It quenched in the tank 3b and the polyester resin film coating metal plate was produced.

Example 3

First and second ultrasonic cooling after bonding to tin-free steel heated to 210-260 ° C. heat-adhesive polyester resin film at a line speed of 30 m / min in the polyester resin film coating line installed as in Example 1 It quenched using both tank 3a, 3b.

Example 4

After installing the third ultrasonic cooling bath so that the distance from the laminate roll to the upper interface of the cooling water is 200 cm, the polyester resin film is coated as in Example 1, and then cooled at a cooling water temperature of 30-60 ° C. and an ultrasonic oscillation frequency of 20-40 KHz. Thereby, the polyester resin film coating metal plate was manufactured. At this time, the line speed was 40 m / min.

Example 5

A polyester resin film-coated metal sheet was produced by coating a polyester resin film at a line speed of 40 m / min in a laminate line installed as in Example 1 and Example 4 and then rapidly quenching using all of the first to third ultrasonic cooling baths. .

[Prior Example 1]

A polyester resin film having a heat-adhesive polyester resin is bonded to Tin Free Steel heated to 210-260 ° C., and then quenched by continuously spraying water at 30 ° C. using a pump and a nozzle to quench the polyester resin film. A coated metal plate was obtained.

[Conventional Example 2]

After bonding the polyester resin film having a heat-adhesive polyester resin film to the tin-free steel heated to 210-260 ℃ as in Example 1, 20-40 ℃ in a cooling bath installed so that the distance from the laminate roll to the upper interface of the cooling water is 200cm The polyester resin film fibrous metal plate was manufactured by quick-quenching using the pure water of.

As described above, the polyester resin film-coated metal plates prepared in Examples 1 to 5 and the conventional examples 1 and 2 were evaluated by comparing the characteristics of the degree of crystallinity, adhesion, processing adhesion, and storage of contents. same.

The uniformity of crystallinity was evaluated by X-ray diffraction method to measure the degree of crystallinity remaining in the film by X-ray diffraction method. In the case of less than 5%, it was rated as good.

Adhesion is very good if it is not peeled off, after peeling with an X-shape on the sample and performing a peeling test with a tape and performing a peeling test with a tape. It was judged as defective at the time of peeling. In addition, the sample was cut into 11 pieces of width and length of 2 mm in width and subjected to a forced peel test with a tape to evaluate the adhesion by the number of films peeled out of a total of 100 squares. It was judged as excellent at 3 or less, normal at 5 or less, and poor at 6 or more peelings.

The processing adhesion is made by draw redrawing canning method, and the tube is immersed in boiling water at 100 ℃ for 1 hour, and the adhesion is evaluated as the degree of peeling of the film from the sample. Usually 5 mm or less, and 6 mm or more was evaluated as bad.

Storage contents are very good when the eluted iron concentration is not evaluated by putting 30 ml of citric acid with pH 2.2 in akses tube and leaving it at 50 ℃ for one month by draw redrawing production method. When it is 5 ppm or less, normally, when 6 ppm or more, it evaluated as bad. Here, (double-circle) shows the very outstanding thing, (circle) shows the excellent thing, (triangle | delta) shows a normal thing.

As can be seen from Table 1, the polyester resin film-coated metal sheet obtained by the present invention was very excellent in the degree of uniformity, adhesion, processing adhesion, and storage of the crystallinity, but in the case of the conventional example, such characteristics are excellent or normal It was only that.

Therefore, the polyester resin film-coated metal sheet obtained by the present invention was very excellent in uniformity of crystallinity, adhesion, processing adhesion, and contents storage property, and good effects such as greatly improving product quality were achieved.

Claims (4)

A method for producing a polyester resin film-coated metal sheet, the method for producing a polyester resin film-coated metal sheet, wherein the polyester resin film is laminated on a metal plate and then quenched in an ultrasonic cooling tank equipped with an ultrasonic generator. The method of claim 1, wherein the rapid cooling is performed in a plurality of ultrasonic cooling tanks installed in multiple stages at a predetermined distance from the laminate roll. An ultrasonic cooling tank provided with ultrasonic generators on both sides of the metal plate on which the polyester resin film is laminated; A pure water supply pipe installed at an upper portion of the ultrasonic cooling tank to supply pure water to the cooling tank, the pure water supply pipe having a solenoid valve controlling a pure water supply; An apparatus for producing a polyester resin film-coated metal sheet, comprising: an overflow pipe connected to an ultrasonic cooling tank. Ultrasonic generators are installed in each of the ultrasonic generators on both sides of the metal plate laminated to the polyester resin film is moved in a plurality of steps apart from the laminate roll by a predetermined distance and the slits are formed through the metal plate in the lower portion; A cooling water storage tank installed under the ultrasonic cooling tank for storing pure water to be supplied to the cooling tank; A pure water supply pipe installed at an upper portion of the cooling water storage tank to supply pure water to the cooling water storage tank, the pure water supply pipe having a solenoid valve controlling a pure water supply; A pump installed in the lower portion of the cooling water storage tank to pressurize and supply cooling furniture to each cooling tank through the cooling water pipe from the cooling water storage tank; An apparatus for producing a polyester resin film-coated metal sheet, comprising: an overflow pipe extending from each ultrasonic cooling tank to a cooling water storage tank.

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