JPH08258217A - Organic filmed steel plate and manufacture thereof - Google Patents

Abstract

PURPOSE: To obtain organic filmed steel plate, the production cost of which is reduced, the design of which is highly advance and the facility for which is simplified. CONSTITUTION: In the constitution of organic filmed steel plate, which is produced by bonding multilayered film 1 applied with hot-melt type adhesive in advance to steel plate 2, two or more bonding layers made of the hot-melt type adhesive are formed under the condition that some difference is set between the melting temperatures of the respective bonding layers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic coated steel sheet and a method for manufacturing the same, and more particularly to an organic coated steel sheet used in a place requiring a high degree of design, such as a refrigerator door or an elevator door. The present invention relates to a steel plate and a manufacturing method thereof.

[0002]

2. Description of the Related Art FIG. 6 is a process diagram showing an example of a conventional production line for an organic coated steel sheet (laminated steel sheet). As shown in the figure, first, the steel sheet is washed in the pretreatment step through the uncoiler step and the accumulation step. Then, in the roll coater process, a one-part adhesive diluted with a solvent is applied to the steel plate, and the steel plate is preheated through a baking oven in a primer oven process and a roll coater process. Then, the film is pressure-bonded by the laminator roll in the laminator roll process, and post-heated in the oven process for adhesion. After that, the mirror roll process, the cooling process, and the dryer process are performed to reach the accumulation process and the recoiler process.

[0003]

According to the method for producing an organic coated steel sheet as described above, since a solvent-type adhesive which is a dangerous substance is used during production, the equipment must be subjected to explosion-proof treatment or the like. , Equipment scale and cost will increase. Further, since there is a step of applying the adhesive agent to the steel sheet, if a foreign matter is mixed during the application of the adhesive agent, the foreign matter may enter into the adhesive agent and leave a foreign matter mark on the steel sheet to which the film is adhered. Therefore, the yield during the manufacturing process is poor and the cost is high.

Further, when the adhesive surface of the film adheres to the steel plate, distortion of the film may cause the product to have a distorted skin, which makes it difficult to produce an organic coated steel plate with high design.
Also, although the steel plate is washed as a pretreatment process for adhesion,
This cleaning equipment is generally inevitably large in size, and the equipment scale, space, and cost increase.

The present invention has been made in order to solve the above-mentioned problems, and it is necessary to perform explosion-proof treatment etc. on equipment in order to perform bonding without using a dangerous solvent-type adhesive when manufacturing an organic coated steel sheet. It is an object of the present invention to obtain an organic coated steel sheet and a method for producing the same, which can reduce the scale and cost of equipment. Further, since the film is adhered by omitting the step of applying the adhesive to the steel plate, foreign matter does not enter into the adhesive at the time of applying the adhesive, and no foreign matter mark is generated on the steel plate to which the film is adhered. Therefore, it is an object of the present invention to obtain an organic coated steel sheet and a manufacturing method thereof that can improve the yield during the manufacturing process and reduce the cost.

Further, when the adhesive layer adheres to the steel plate,
An object of the present invention is to obtain an organic coated steel sheet having high designability and improved sharpness, in which distortion of the film at the time of adhesion is reduced to prevent a product-like skin from being formed. Further, a method for producing an organic coated steel sheet, which can eliminate the cleaning of steel sheet as a pretreatment step of the adhesion step, avoid increase in equipment scale, space and cost, and can secure the adhesive strength between the film and the steel sheet. The purpose is to get.

[0007]

The organic coated steel sheet and the method for producing the same according to the present invention are configured as follows. (1) When a film to which a hot-melt adhesive has been applied in advance is adhered to a steel sheet to form a coated steel sheet, two or more adhesive layers made of a hot-melt adhesive are formed and melted in each of these adhesive layers. It has a temperature difference.

(2) In the organic coated steel sheet according to (1), a thermoplastic resin made of EEA is used as a component of the hot melt adhesive. (3) In the organic coated steel sheet according to (1) above, a thermoplastic resin made of EVA is used as a component of the hot melt adhesive.

(4) In the organic coated steel sheet according to the above (1) to (3), the thickness of each adhesive layer made of a hot melt adhesive is 5 μm to 25 μm. (5) In the organic coated steel sheet according to (1) to (4), the melting temperature difference between the adhesive layers made of the hot melt adhesive is 5 ° C to 30 ° C.

(6) A pretreatment process for surface modification of each bonding surface of the steel plate and the film, a preheating process for drying the steel plate, a laminating process for bonding the film and the steel plate, and a hot-melt adhesive applied to the steel plate. For post-heating process,
The organic coated steel sheet is manufactured by a mirror finishing step of finishing the surface to a mirror finish and a cooling step of cooling with a stocker. (7) In the method for manufacturing an organic coated steel sheet according to (6) above, corona discharge treatment is performed on each adhesive surface of the steel sheet and the film in a pretreatment step of performing surface modification of each adhesive surface of the steel sheet and the film. It is a thing.

[0011]

[Action]

(1) When a film to which a hot-melt adhesive has been applied in advance is adhered to a steel sheet to form an organic coated steel sheet, two or more layers of hot-melt adhesive having a melting temperature difference are used. The coated film is adhered to a steel plate to form an organic coated steel plate.

(2) A film coated with a hot melt type adhesive composed of EEA is adhered to a steel plate to form an organic coated steel plate. (3) A film coated with a hot melt type adhesive made of EVA is adhered to a steel plate to form an organic coated steel plate. (4) The thickness of each layer made of hot melt adhesive is 5
A film having a thickness of μm to 25 μm is adhered to a steel plate to form an organic coated steel plate. (5) A film having a melting temperature difference of 5 ° C. to 30 ° C. of each layer made of a hot melt adhesive is adhered to a steel plate,
Form an organic coated steel sheet.

(6) Pretreatment by surface modification of each adhesive surface of the steel sheet and the film, preheating for drying the steel sheet, the film and the steel sheet are adhered, and the hot melt adhesive is applied to the steel sheet. In order to heat, the final roll is mirror-finished, cooled by a stocker and conveyed to a post-processing line to form an organic coated steel sheet. (7) As a pretreatment in the organic coated steel sheet manufacturing process,
Corona discharge treatment is applied to the adhesive surface between the steel plate and the film.

[0014]

【Example】

First Embodiment FIG. 1 is an explanatory diagram of a first embodiment of the present invention. 1 is an adhesive-integrated multi-layer film which is printed with a design property and which is previously coated with a hot-melt adhesive.
Is a steel plate, and the figure shows a highly-designed organic coated steel plate when the multilayer film 1 is bonded to the steel plate 2. 3 is the first layer of the multi-layer film 1 and has a thickness of 25 μm and surface UV
The hard coat PET layer, 4 is located underneath and the second
It is a printed layer having a thickness of, for example, 2 μm to 3 μm. 5
Is located underneath and forms a third layer, for example, a thickness of 50 μm
And is a hiding layer of white PET or PVC.

Reference numeral 6 designates a first layer which is located below the first layer and constitutes a fourth layer.
The hot-melt adhesive layer is composed of, for example, EEA (ethylene-ethyl acrylate copolymer), a component of a hot-melt adhesive composed of an ethylene component-rich thermoplastic resin. Reference numeral 7 is a second hot melt adhesive layer which is located below it and forms a fifth layer. This layer is, for example, a hot melt made of EEA (ethylene-ethyl acrylate copolymer), a thermoplastic resin rich in an ester component. It is composed of the components of the mold adhesive.

The first hot melt adhesive layer 6 forming the fourth layer and the second hot melt adhesive layer 7 forming the fifth layer.
Means that the melting temperature of the second hot melt adhesive layer 7 is different from that of the first hot melt adhesive layer 6 with the melting temperature difference being 5 ° C. to 30 ° C., preferably 10 ° C. It is designed to be higher than. The thickness of the first hot melt adhesive layer 6 is, for example, 25 μm, and the thickness of the second hot melt adhesive layer 7 is, for example, 25 μm.
The thickness of each layer is 1 μm to 50 μm, preferably 5 μm to 2
The thickness of the two layers is 2 μm to 100 μm as a whole, preferably 10 μm to 50 μm.
μm.

Thus, the above five layers 3, 4, 5, 6, 7
Thus, the multilayer film 1 is formed. On the other hand, 8 is a galvanized layer, 9 is a base material made of SPCC having a thickness of 450 μm, for example, and the steel plate 2 is formed by these two layers 8 and 9.

Thus, when the multilayer film 1 is bonded to the heated steel plate 2, there is a time lag in the melting time of the first and second hot melt adhesive layers 6 and 7, and the hot melt adhesive is gradually melted. Therefore, the distortion of the film that occurs when the hot-melt adhesive is rapidly melted is suppressed, and it prevents the peeled skin during manufacturing, and makes it possible to improve the design, improve the clarity, and improve the quality. The cost can be reduced.

Example 2 In the first example, EEA and ethylene component rich were used as the first hot melt adhesive layer 6 forming the fourth layer, and the fifth hot melt adhesive layer 6 was used.
As the second hot melt adhesive layer 7 forming the tank, EEA and ester component rich were used to provide a melting temperature difference between them, but in the present embodiment, the first hot melt adhesive layer 6 forming the fourth layer is the same. A thermoplastic resin of EVA (ethylene-vinyl acetate copolymer) is used as a component of the adhesive, and E is used as a component of the adhesive of the second hot melt adhesive layer 7 forming the fifth tank.
A thermoplastic resin of VA (ethylene-vinyl acetate copolymer) is used to provide a melting temperature difference between each of these layers 6 and 7.

Thus, when the multilayer film 1 is bonded to the heated steel plate 2, there is a time lag in the melting time of the first and second hot melt adhesive layers 6 and 7, and the hot melt adhesive is gradually melted. Therefore, distortion of the film caused when the hot-melt adhesive is rapidly melted is suppressed, and it is possible to prevent distorted skin at the time of manufacturing, improve the design, improve the sharpness, and improve the quality.

Example 3 In the first example, a high-design organic coated steel sheet uses two layers of hot-melt type adhesives having different melting temperatures on the adhesive surface of the multilayer film 1. In the example, the adhesive is composed of three or more layers with different melting temperatures. With such a configuration, distortion of the film at the time of adhesion is further reduced, and it becomes possible to further enhance the design, improve the sharpness, and improve the quality.

Embodiment 4 FIG. 2 is a process drawing showing the manufacturing process of the fourth embodiment of the present invention. As shown in the figure, a steel plate 2 that constitutes an organic coated steel plate
The base material is, for example, a galvanized steel plate, and in the pretreatment process of the steel plate 2, oil and fat components, foreign matters, etc. on the surface of the steel plate 2 are mainly removed. In the next drying step, the drying temperature is set to 100 ° C. to 200 ° C. and preheating for drying and bonding the steel sheet 2 is performed. In the next bonding step, the multilayer film 1 is pretreated and then the roll temperature, speed and pressure are controlled to bond the multilayer film 1 and the steel plate 2 to each other. At this time, as the roll material, an SUS material or a material obtained by rolling a silicon rubber material on it is used.

In the next post-heating step, post-heating is performed at 100 ° C. to 200 ° C. in order to adapt the hot-melt adhesive to the steel plate 2, and the surface is mirror-finished in the next mirror-finishing step. Next, it is cooled by a stocker and conveyed to a post-processing line. In this way, since the adhesive is used without using solvent-based adhesive, which is a dangerous substance, explosion-proof equipment can be eliminated, equipment space can be reduced, equipment can be simplified, and cost reduction can be achieved. There is no problem such as mixing of foreign matter in the process, and the yield is improved.

Embodiment 5 FIG. 3 is a schematic diagram of a corona discharge treatment apparatus according to a fifth embodiment of the present invention. The corona discharge treatment on the steel sheet 2 is performed in the pretreatment process of the fourth embodiment (FIG. 2), and the corona discharge treatment on the multilayer film 1 is performed immediately before the bonding process. In the figure,
10 is, for example, a power supply for corona discharge of AC100V, 11
Is a generator, 12 is a transformer, 13 is an electrode, 14
Is an insulator and 15 is a metal (earth). Then, the corona discharge of the multilayer film 1 and the steel plate 2 is performed by the above corona discharge treatment device.

FIG. 4 is an explanatory diagram showing a comparison of adhesive strengths which differ depending on the conditions of the pretreatment process. As shown in the figure,
ISO peel adhesion strength is for steel plate degreasing treatment (A type), steel plate non-treatment, steel plate corona treatment (B type), steel plate no treatment, steel plate corona treatment, film corona treatment (C type), steel plate No processing, film corona treatment (D type), steel plate degreasing treatment, steel plate corona treatment, and film corona treatment (E type) are divided into 5 types: E type steel sheet degreasing treatment, steel plate corona treatment, film corona treatment. The treatment has the highest adhesive strength, and in the following, the adhesive strength decreases in the order of C type, A type, D type, and B type.

Therefore, when both the multilayer film 1 and the steel plate 2 are subjected to corona discharge treatment, the adhesive strength of the steel plate 2 is not degreased even if the steel plate 2 is not subjected to degreasing treatment (C type). It was confirmed that it was a processed product (A type) or more. Thus, as a pretreatment process,
By performing corona discharge treatment on the surface of the adhesive surface between the steel sheet 2 and the multilayer film 1 to modify it, the adhesive strength between the steel sheet 2 and the multilayer film 1 can be increased. Since it can be abolished, equipment simplification,
It is possible to save space and reduce costs.

Embodiment 6 FIG. 5 is a perspective view of a sixth embodiment of the present invention. The figure shows a case where a highly designed organic coated steel sheet is used as the door 17 of the refrigerator 16, for example. The organic coated steel sheet can be used not only for the door 17 of the refrigerator, but also for many products such as an elevator door that require high designability. In this way, it is possible to give many products a high-class feeling by improving the quality and the sophistication of the design, and further it is possible to reduce the cost itself.

[0028]

As is apparent from the above description, according to the organic coated steel sheet and the manufacturing method thereof according to the present invention, the following effects can be obtained. In the description, the same number as the claim number is attached to describe the effect of each claim. (1) When a film to which a hot-melt adhesive has been applied in advance is adhered to a steel sheet to form an organic coated steel sheet, two or more adhesive layers made of a hot-melt adhesive are formed and melted in each adhesive layer. Since it is configured to have a temperature difference, it is possible to achieve sophisticated design and quality improvement, and also to simplify equipment and reduce costs. Furthermore, there is a time lag in the melting time of each hot melt adhesive layer when bonding steel sheets, the distortion of the film that occurs when the hot melt adhesive rapidly melts is suppressed, the yuzu skin during manufacturing is prevented, and the design is advanced. It is possible to improve the sharpness and the quality.

(2) Since the thermoplastic resin made of EEA is used as a component of the hot melt adhesive, there is a time lag in the melting time of the hot melt adhesive layer at the time of adhering the steel plate, and the hot melt adhesive is Distortion of the film that occurs when it is rapidly melted is suppressed, and it is possible to prevent distorted skin during manufacturing, improve design, improve sharpness, and improve quality.

(3) Since the thermoplastic resin made of EVA is used as a component of the hot melt type adhesive, a time lag can be caused in the melting time of the hot melt adhesive layer at the time of adhering the steel sheet, and the hot melt type adhesive can be obtained. Distortion of the film that occurs when it is rapidly melted is suppressed, and it is possible to prevent distorted skin during manufacturing, improve design, improve sharpness, and improve quality.

(4) Since the thickness of each adhesive layer made of the hot-melt adhesive is 5 μm to 25 μm, an effective time lag can be provided for the melting time of the hot-melt adhesive layer when adhering steel plates. The distortion of the film caused by the rapid melting of the hot-melt adhesive can be effectively suppressed, and the yuzu skin during production can be prevented, so that the design can be improved, the sharpness can be improved, and the quality can be improved.

(5) Since the difference in melting temperature between the adhesive layers made of the hot-melt type adhesive is set to 5 ° C. to 30 ° C., a time lag effective for melting time of the hot-melt adhesive layer at the time of adhering steel plates. The distortion of the film that occurs when the hot melt adhesive is rapidly melted is effectively suppressed, the yuzu skin during manufacturing is prevented, and the design is advanced,
Improvement of sharpness and quality can be achieved.

(6) A pretreatment process for surface modification of each bonding surface of the steel plate and the film, a preheating process for drying the steel plate, a laminating process for bonding the film and the steel plate, and a hot-melt adhesive to the steel plate. A post-heating process to familiarize yourself,
The method for producing an organic coated steel sheet comprises a mirror-finishing step for mirror-finishing, a cooling step for cooling with a stocker, and a post-processing step for transporting to a post-processing line. Because of this, unlike conventional methods, hot melt film-steel bonding can be done without solvent, so explosion-proof equipment can be abolished, equipment space can be reduced, and equipment can be simplified and costs can be reduced. it can. Further, since the film is adhered in the state where the hot-melt type adhesive is applied in advance, the problem that foreign matters are mixed in in the step of applying the adhesive as in the conventional case is eliminated, and the yield is improved.

(7) Since the corona discharge treatment is performed on each adhesive surface of the steel sheet and the film in the pretreatment step for modifying the surface of each adhesive surface of the steel sheet and the film, it is possible to eliminate the conventional cleaning step. Nevertheless, it is possible to obtain an adhesive strength equal to or higher than the adhesive strength of the degreased product obtained by cleaning, and it is possible to simplify equipment, save space, and reduce cost.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a first embodiment of the present invention.

FIG. 2 is a manufacturing process diagram of a fourth embodiment of the present invention.

FIG. 3 is a schematic diagram of a fifth embodiment of the present invention.

FIG. 4 is an explanatory diagram showing the relationship of the adhesive strength of the present invention.

FIG. 5 is a perspective view of a sixth embodiment of the present invention.

FIG. 6 is a process drawing showing an example of manufacturing a conventional organic coated steel sheet.

[Explanation of symbols]

1 multilayer film, 2 steel plate, 6 1st hot-melt adhesive layer, 7 2nd hot-melt adhesive layer.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B32B 31/24 7148-4F B32B 31/24 C23C 26/00 C23C 26/00 Z

Claims (7)

[Claims] 1. When a film to which a hot-melt type adhesive has been applied in advance is adhered to a steel plate to form a coated steel sheet, an adhesive layer composed of the hot-melt type adhesive is used.
An organic coated steel sheet, characterized in that it is formed in more than one layer and each of these adhesive layers has a difference in melting temperature. 2. EE as a component of a hot melt adhesive
The organic coated steel sheet according to claim 1, wherein a thermoplastic resin consisting of A is used. 3. EV as a component of a hot melt adhesive
The organic coated steel sheet according to claim 1, wherein a thermoplastic resin consisting of A is used. 4. The organic coated steel sheet according to claim 1, wherein the thickness of each adhesive layer made of a hot-melt adhesive is 5 μm to 25 μm. 5. The organic coated steel sheet according to any one of claims 1 to 4, wherein a difference in melting temperature between the adhesive layers made of a hot melt adhesive is set to 5 ° C to 30 ° C. 6. A pretreatment step of surface-modifying each bonding surface of a steel sheet and a film, a preheating step of drying the steel sheet,
It is characterized by comprising a laminating step of adhering the film and the steel sheet, a post-heating step for applying the hot melt adhesive to the steel sheet, a mirror finishing step for mirror finishing the surface, and a cooling step for cooling with a stocker. Manufacturing method of organic coated steel sheet. 7. The organic coated steel sheet according to claim 6, wherein corona discharge treatment is performed on each adhesive surface of the steel sheet and the film in a pretreatment step of modifying the surface of each adhesive surface of the steel sheet and the film. Manufacturing method.