JPH0780937A - Production of laminated metal panel - Google Patents

Abstract

PURPOSE:To prevent the adhesion of an overcoated resin to a winding roll or a press bonding roll by making the width of a molten thermoplastic resin film larger than that of a metal panel and applying the central part of the thermoplastic resin film to the metal panel to suck the thermoplastic resin film by the winding roll having openings provided to the surface thereof in the vicinity of the pressure contact part with the press bonding roll. CONSTITUTION:A metal panel 4 is pressed by a winding roll 1 and a press bonding roll 2 to be preheated and a thermoplastic resin film 5 is allowed to flow down to the interface of one surface of the preheated metal panel 4 and the press bonding roll to be closely bonded to the metal panel 4. In this case, the thickness of the thermoplastic resin film 5 is almost uniform in the vicinity of the central part thereof but large at both end parts thereof. Therefore, the width of the thermoplastic resin film 5 is made larger than that of the metal panel 4 and the central part almost uniform in thickness of the thermoplastic resin film is applied to the metal panel 4. The thermoplastic resin film is sucked in the vicinity of the pressure contact part with the press bonding roll 2 by the openings 6 provided to the surface of the winding roll 1. The width of the winding roll is made larger than that of the thermoplastic resin film 5. As a result, the thermoplastic resin film 5 is not bonded to the press bonding roll 2.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for producing a laminated metal plate. More specifically, it relates to a method for producing a laminated metal plate that can be suitably used, for example, as a building material, an interior material for automobiles, a material for household electric appliances, a material for furniture furniture, a material for cans, and the like.

[0002]

2. Description of the Related Art Heretofore, as a surface-treated metal plate coated with a synthetic resin, a color steel plate coated with a thermosetting acrylic resin paint or a polyester resin paint or a laminated steel plate laminated with a resin film is known. . Since these laminated steel sheets have a beautiful color, appearance and corrosion resistance, they have been widely used for applications such as building materials, interior materials for automobiles, materials for household electric appliances and materials for furniture furniture.

However, in a color steel sheet coated with a coating material, a resin having a relatively low molecular weight is used as a resin used for the coating material in consideration of coating workability, and a high molecular weight is also obtained by bake curing after coating. Not only is it insufficient, the flow on the metal substrate is not sufficient, and the formed coating film has the drawback of lacking durability.

On the other hand, a laminated steel sheet laminated with a resin film uses a film obtained by extrusion molding a high molecular weight resin such as vinyl chloride resin, acrylic resin, or fluororesin, and therefore has a molecular weight of ,
It is much higher than the paint resin, and the durability of the coating film on the substrate is higher than that when the paint is applied, for example, 3 to 5 years.
It has the advantage of being significantly superior in 10 to 20 years.

However, in the laminated steel sheet laminated with the resin film, if the thickness of the film is reduced, it becomes difficult to uniformly laminate the film on the substrate, and a phenomenon such as wrinkling occurs on the surface appears. Usually, the limit is about 50 μm, and since there are microscopic irregularities on the substrate, a space is likely to occur between the solidified film and the substrate, resulting in insufficient adhesion of the film,
Since it is once formed as a film, there is a problem that the resin used is limited in terms of film forming ability.

By the way, as a method for producing a laminated metal plate having a beautiful appearance and more excellent adhesion and corrosion resistance than the conventional color steel plate and laminated steel plate, for example, a metal substrate is heated to 50 to 170 ° C. with a heating roll. After preheating to a cooling roll, the molten resin is extruded between the cooling roll and the metal substrate preheated by the heating roll, and then the extruded molten resin is cooled by the cooling roll and the metal substrate is heated. A method of pressure bonding has been proposed (Japanese Patent Laid-Open No. 57-203545).

However, since the extrusion lamination method is adopted as such a method, the width of the molten thermoplastic resin film flowing down from the slit opening of the T die becomes narrower as it flows down from the opening (neck). Inn)
The film thickness is almost uniform in the central part of the thermoplastic resin film, but the film thickness is large at both end parts, and the film thickness of the resin film in the width direction of the obtained laminated metal plate becomes uneven. There's a problem.

As a method for solving such a problem, there is a method in which the width of the thermoplastic resin film formed by flowing down from the slit opening of the T-die is made larger than the width of the metal base material to cover (overcoat). Although proposed, such a method has a drawback in that the overcoated resin adheres to the winding roll or the pressure roll, and becomes inoperable.

[0009]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned prior art, and it is possible to efficiently carry out the operation without causing the overcoated resin to adhere to the winding roll or the pressure-bonding roll to make the operation impossible. It is an object of the present invention to provide a method capable of producing a laminated metal plate.

[0010]

That is, according to the present invention, a preheated metal plate is wound around a winding roll, and the winding roll and the pressure roll are brought into pressure contact with each other, and the heat melted in the gap between the pressure roll and the metal plate is melted. In a method for producing a laminated metal plate by flowing a thermoplastic resin film from a T die and coating a metal plate with a thermoplastic resin film, the width of the molten thermoplastic resin film is made larger than the width of the metal plate, In the width direction of the thermoplastic resin film, the metal plate is coated at a central portion having a substantially uniform thickness, and the thermoplastic resin film overcoated on the metal plate is a winding roll having an opening on the roll surface. The present invention relates to a method for producing a laminated metal plate, characterized in that suction is performed in the vicinity of a pressure contact portion with a pressure roll.

[0011]

OPERATION AND EXAMPLES As described above, the manufacturing method of the present invention involves winding a preheated metal plate around a winding roll and bringing the metal roll into pressure contact with the winding roll and the pressure bonding roll to form a gap between the pressure bonding roll and the metal plate. When a molten thermoplastic resin film is made to flow down from a T die and a metal plate is coated with the thermoplastic resin film to produce a laminated metal plate, the width of the molten thermoplastic resin film is made larger than the width of the metal plate. Then, the thermoplastic resin film is covered with a central portion having a substantially uniform thickness in the width direction of the thermoplastic resin film, and the thermoplastic resin film overcoated on the metal plate is wrapped around the roll surface with openings. It is characterized in that suction is performed by a roll in the vicinity of a pressure contact portion with the pressure bonding roll.

The metal plate used in the present invention is used, for example, in building materials such as roofs, walls and partitions, materials for interior materials for automobiles, materials for household electric appliances, materials for furniture furniture, materials for cans, etc. Examples of the metal material include a steel sheet, a galvanized steel sheet, a zinc alloy plated steel sheet, a tin plated steel sheet, a tin alloy plated steel sheet, an aluminum plated steel sheet, an aluminum alloy plated steel sheet, and a stainless steel sheet, but the present invention is not limited to these examples. Not something.

In the present invention, a chemical conversion treatment layer may be provided on the metal plate. Such a chemical conversion treatment layer is formed by treating with, for example, zinc phosphate, iron phosphate, chromate phosphate, or the like in order to improve the corrosion resistance of the metal plate and the adhesion between the metal plate and the thermoplastic resin film. The thickness of the chemical conversion treatment layer is usually 0.1 to
It may be about 5 μm.

In the present invention, an adhesive layer may be provided on the metal plate directly or via the chemical conversion treatment layer. Such an adhesive layer is formed in order to improve the adhesion between the gold layer plate and the thermoplastic resin film. Examples of the adhesive used in the adhesive layer include adhesive thermoplastic resins having a functional group such as modified polyethylene, modified epoxy resin and modified vinyl resin, but the present invention is not limited to these examples. Not something. The thickness of the adhesive layer is not particularly limited, and it is usually about several μm or more.

Examples of the thermoplastic resin used for coating in the present invention include polyesters such as polyethylene terephthalate; ethylene, propylene, 1-butene, 1-
Polyolefin or modified polyolefin composed of homopolymer or copolymer such as pentene; acrylic resin composed of homopolymer or copolymer of (meth) acrylic acid, (meth) acrylic acid ester, (meth) acrylamide; nylon-6, nylon-6, 6, polyamide such as nylon-6,10, nylon-11; polyvinyl chloride; ethylene trifluoride resin, tetrafluoroethylene resin, hexafluoroethylene-propylene resin, vinyl fluoride resin, vinylidene fluoride resin, etc. Examples thereof include fluororesins; polycarbonates; polystyrene resins; ABS resins; chlorinated polyethers; urethane resins, but the present invention is not limited to these examples. In addition,
If necessary, for example, an antioxidant, a modifier, a pigment, an amino resin, an epoxy resin, and the like can be appropriately blended with these thermoplastic resins.

Next, a method for producing the laminated metal plate of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic explanatory view showing one embodiment of the method for producing a laminated metal plate of the present invention.

In FIG. 1, a T die 3 is provided on a pair of rolls consisting of a winding roll 1 and a pressure roll 2.

A thermoplastic resin film 5 which has been melted by heating in advance is formed into a thermoplastic resin film 5 through a T-die 3 and is then brought into pressure contact with a winding roll 1 and a pressure-bonding roll 2 to preheat one surface of a metal plate 4. It is made to flow down to the interface between the pressure-bonding roll 2.

The pressure at which the preheated metal plate 4 is pressed by the winding roll 1 and the pressure bonding roll 2 is not particularly limited,
For example, it may be about 0.2 to 10 kg / cm.

The preheating temperature of the preheated metal plate 4 cannot be unconditionally determined because it depends on the kind of the thermoplastic resin, but if it is too low, the thermoplastic resin film 5 and the metal plate 4 are preheated. If the adhesive strength with No. 4 becomes insufficient and if it is too high, not only the thermoplastic resin will decompose but also it is not preferable from the viewpoint of energy saving.

Therefore, as an example of the preheating temperature,
When the thermoplastic resin is polyethylene terephthalate, the preheating temperature is preferably 140 ° C to the resin temperature at the time of melt extrusion, and when the thermoplastic resin is polypropylene, the preheating temperature is 100 ° C to melting. The resin temperature at the time of extrusion is preferable, and when the thermoplastic resin is polyethylene, the preheating temperature is preferably 90 ° C. to the resin temperature at the time of melt extrusion.

The thermoplastic resin film 5 that has flowed down to the interface between the one surface of the preheated metal plate 4 and the pressure bonding roll 2 adheres to the metal plate 4 between the winding roll 1 and the pressure bonding roll 2.
At this time, the thickness of the formed thermoplastic resin film 5 can be adjusted by adjusting the extrusion amount of the thermoplastic resin film 5 to be made to flow down and the line speed of the metal plate 4. The thickness of the thermoplastic resin film 5 cannot be unconditionally determined because it varies depending on the use of the obtained laminated metal plate, etc., but is usually about 10 to 200 μm, especially 20 to 20 μm.
It is preferably about 100 μm.

In the present invention, an embossing roll can be used as the pressure-bonding roll 2 in order to give the thermoplastic resin film 5 an uneven shape.

Thermoplastic resin film 5 flowed down from the T die 3.
As described above, the neck-in occurs, and the film thickness is almost uniform in the vicinity of the center of the thermoplastic resin film 5, but the film thickness is large at both ends.

Therefore, in the present invention, the width of the thermoplastic resin film 5 is made larger than the width of the metal plate 4, and the metal plate 4 is formed at the central portion where the thickness of the thermoplastic resin film 5 is substantially uniform in the width direction. To cover. The width of the thermoplastic resin film 5 is not particularly limited, and is arbitrary as long as the metal plate 4 is covered in a portion where the thickness of the thermoplastic resin film 5 is substantially uniform.

Next, the thermoplastic resin film 5 overcoated on the metal plate 4 is sucked in the vicinity of the pressure contact portion with the pressure bonding roll 2 through the opening provided on the surface of the winding roll 1.

FIG. 2 is a schematic view when the thermoplastic resin film 5 and the metal plate 4 are fed between the winding roll 1 and the pressure-bonding roll 2 and the thermoplastic resin film 5 and the metal plate 4 are pressed against each other. FIG.

The width of the wrapping roll 1 is set to be larger than the width of the thermoplastic resin film 5 in order to allow the wrapping roll 1 to suck the overcoated thermoplastic resin film 5. preferable. The surface of the winding roll 1 is provided with a plurality of openings 6 for sucking the thermoplastic resin film 5 overcoated on the metal plate 4. The diameter of the opening 6 is not particularly limited, but if it is too small, the thermoplastic resin film 5 will be pushed into the hole by pressure contact, and if it is too large, the opening 6 will be opened. Since the thermoplastic resin film 5 is sucked into the holes 6, it is preferable that the thickness is usually about 5 to 10 mm. Also,
The number of the openings 6 is arbitrary as long as the thermoplastic resin film 5 is sufficiently sucked by the winding roll 1. The opening 6 may be provided at least between the end of the metal plate 4 and the end of the overcoated thermoplastic resin film 5.

The position at which the thermoplastic resin film 5 overcoated on the metal plate 4 is sucked by the openings 6 formed in the surface of the winding roll 1 is set between the winding roll 1 and the pressure bonding roll 2. In between, the metal plate 4 and the thermoplastic resin film 5 are set so as to be in the vicinity of the pressure contact portion where they are pressed against each other, and to the rear of the contact position between the metal plate 4 and the thermoplastic resin film 5.

Since the overcoated thermoplastic resin film 5 is sucked through the openings 6 on the surface of the winding roll 1 as described above, the thermoplastic resin film 5 is prevented from adhering to the pressure bonding roll 2. To be done.

Further, since the opening 6 is provided on the surface of the winding roll 1, the area covered by the thermoplastic resin film 5 on the winding roll 1 is reduced by the area of the opening 6. Therefore, the adhesive force of the thermoplastic resin film 5 to the surface of the winding roll 1 is reduced by that much, the thermoplastic resin film 5 overcoated on the winding roll 1 is not wound, and the thermoplastic resin film 5 is removed. It can be easily peeled off.

Further, in the present invention, as shown in FIG. 1, both ends in the width direction where the thermoplastic resin film 5 is overcoated on the roll surface of the winding roll 1 on which the metal plate 4 is not wound. If it is cooled in advance by using the cooling roll 7, the adhesive force between the overcoated thermoplastic resin film 5 and the winding roll 1 is reduced, and the cooling and solidification of the thermoplastic resin film 5 is promoted. Therefore, it becomes easy to peel off the overcoated thermoplastic resin film 5 from the winding roll 1.

Instead of using the cooling roll 7, both widthwise ends of the winding roll 1 on which the thermoplastic resin film 5 is overcoated may be contacted with the cooling medium in advance. As the cooling medium, for example, air, water, steam-water (misty) in which water and air are mixed, liquid nitrogen, or the like is preferable in terms of economy and cooling ability. As a method of bringing the cooling medium into contact with the winding roll 1, for example, as shown in FIG.
However, the present invention is not limited to this example.

Further, in the present invention, by cooling the overcoated thermoplastic resin film 5, the cooling and solidification of the resin is promoted, and the surface of the winding roll 1 and the overcoated thermoplastic resin film 5 are combined. Decrease the adhesion of
In order to allow the thermoplastic resin film 5 to be easily peeled off from the winding roll 1, for example, as shown in FIG. 1, a portion rearward of the pressure contact position between the metal plate 4 and the thermoplastic resin film 5 is provided. It is preferable to cool the wrapping roll 1 by bringing the cooling roll 9 into pressure contact with the portion where the thermoplastic resin film 5 is overcoated, or by bringing the cooling medium into contact with the cooling nozzle 10 or the like.

Next, the method for producing the laminated metal plate of the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.

Example 1 The laminated metal plate manufacturing apparatus shown in FIG. 1 was used.

As the pair of rolls, a winding roll 1 having an outer diameter of 300 mm and a pressure bonding roll 2 having an outer diameter of 300 mm were used.

As the metal plate 4, an electrolytic chromic acid treated steel plate having a thickness of 0.2 mm and a width of 800 mm was used.

First, the electrolytic chromic acid-treated steel sheet is preheated to 180 ° C., and then polyethylene terephthalate (280 ° C.) melted from the T-die is melted at the interface between the electrolytic chromic acid-treated steel sheet and the pressure-bonding roll 2. Extrude, let flow down,
The thickness of the polyethylene terephthalate film was adjusted to 50 μm, and the film was conveyed at a line speed of 15 m / min. The polyethylene terephthalate film was overcoated with 40 mm on each side from the end of the steel sheet.

Next, about 10 to 30 mm downstream from the pressure contact between the electrolytic chromic acid treated steel sheet and the polyethylene terephthalate film.
An opening (diameter 8 mm) provided in the winding roll 1
The polyethylene terephthalate film overcoated by sucking air into the roll was sucked onto the winding roll 1 to produce a laminated metal plate.

At this time, it was confirmed that the overcoated polyethylene terephthalate film was not wrapped around the winding roll 1 and the pressure bonding roll 2 and could be operated stably.

Comparative Example 1 In Example 1, except that the means for sucking the overcoated polyethylene terephthalate film by sucking air through the openings provided in the winding roll 1 to the winding roll was not used. An attempt was made to produce a laminated metal plate in the same manner as in Example 1.

At this time, the overcoated polyethylene terephthalate film adhered to the pressure-bonding roll and became inoperable.

Example 2 In Example 1, as shown in FIG. 1, a cooling roll made of copper (outer diameter 50 mm, width 40 mm, water having a cooling medium of 25 ° C.) 7 and a cooling nozzle (cooling medium air) 8 were used. Wrapping roll 1
Overcoated polyethylene terephthalate film 5
Cools the parts that come into contact with each other, and also uses a copper cooling roll (outer diameter
A laminated metal plate was prepared in the same manner as in Example 1 except that the overcoated polyethylene terephthalate film 5 was cooled using a 50 mm, a width of 40 mm, a cooling medium of 25 ° C. water) 9 and a cooling nozzle (cooling medium air) 10. It was made.

At this time, it was confirmed that the overcoated polyethylene terephthalate film could be stably operated without being wound around the winding roll 1 and the pressure bonding roll 2.

Next, the line speed is changed from 15 m / min to 70
When the operation was performed after changing to m / min, the overcoated polyethylene terephthalate film was wound on the roll 1.
Moreover, it was possible to operate stably without being wound around the pressure-bonding roll 2. From this, the cooling rolls 7, 9,
When cooling is performed using the cooling nozzles 8 and 10,
It is understood that the laminated metal plate can be obtained more efficiently.

[0048]

According to the manufacturing method of the present invention, the thermoplastic resin film overcoated on the metal plate does not adhere to the winding roll or the pressure bonding roll, and the laminated metal plate can be efficiently manufactured. Played.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing one embodiment of a method for producing a laminated metal plate of the present invention.

FIG. 2 is a schematic explanatory diagram when the thermoplastic resin film and the metal plate are pressed against each other in the method for producing a laminated metal plate of the present invention.

[Explanation of symbols]

 1 Winding Roll 2 Crimping Roll 3 T Die 4 Metal Plate 5 Thermoplastic Resin Film 6 Open Hole

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display area B29L 9:00

Claims (5)

[Claims] 1. A preheated metal plate is wound around a wrapping roll, brought into pressure contact with the wrapping roll and a pressure roll, and a melted thermoplastic resin film is caused to flow down from a T-die in a gap between the pressure roll and the metal plate. In the method for producing a laminated metal plate by coating a thermoplastic resin film on a metal plate, the width of the molten thermoplastic resin film is larger than the width of the metal plate, and in the width direction of the thermoplastic resin film. Suction the thermoplastic resin film that covers the metal plate at the center with a substantially uniform thickness and overcoats the metal plate in the vicinity of the pressure contact part with the pressure bonding roll with a winding roll having an opening on the roll surface. A method for producing a laminated metal plate, which comprises: 2. The method for producing a laminated metal plate according to claim 1, wherein both widthwise end portions of the winding roll on which the thermoplastic resin film is overcoated are cooled in advance by cooling rolls. 3. The method for producing a laminated metal plate according to claim 1, wherein both ends in the width direction of the winding roll on which the thermoplastic resin film is overcoated are brought into contact with a cooling medium in advance and cooled. 4. The method for producing a laminated metal plate according to claim 1, 2 or 3, wherein a cooling roll is brought into pressure contact with a portion where the thermoplastic resin film is overcoated. 5. The method for producing a laminated metal plate according to claim 1, 2 or 3, wherein a cooling medium is brought into contact with the overcoated portion of the thermoplastic resin film to cool it.