JP3057333B2 - Manufacturing method of laminated metal sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a laminated metal plate having excellent corrosion resistance and adhesion with good yield.

[0002]

2. Description of the Related Art Conventionally, when manufacturing a laminated metal plate having excellent corrosion resistance and adhesion, when a resin is continuously coated on the surface of the metal plate, the preheated metal plate is melt-kneaded by an extruder. A method of extruding a thermoplastic resin from a T-die is known (JP-A-57-203545). FIG. 6 shows a method of manufacturing a laminated metal plate specifically disclosed in Japanese Patent Application Laid-Open No. 57-203545, which is wound around a heating roll 9 and around a cooling roll 10.
Further, the thermoplastic resin 6 melted from the T die 5 flows down through the extruder 4 to the interface between the surface of the preheated metal plate 3 pressed by the heating roll 9 and the cooling roll 10 and the cooling roll 10 via the extruder 4. A mode in which the thermoplastic resin 6 is continuously coated on the metal plate 3 will be described. The metal plate (laminated metal plate) 8 coated with the resin is wound up through a cooling device (not shown) such as a water cooling tank or a cooling roll downstream of the cooling roll 10.

There is also known a method of manufacturing a laminated metal plate in which the heating roll 9 is a normal nip roll, and a preheating device such as an induction heating type or a gas heating type is arranged upstream of the nip roll to preheat the metal plate. Have been. In addition,
As the cooling roll 10, a water-cooled roll made of a metal such as iron or copper, which is generally inexpensive, has good heat conductivity, and has a good cooling performance, is used. In order to accomplish this, a water-cooled metal roll having a hard chrome plated surface is also used.

As the nip roll, a rubber nip roll made of silicon rubber, chloroprene rubber, polytetrafluoroethylene rubber or the like having good press-fitting and heat-resistant properties is usually used. By the way, when manufacturing a laminated metal plate by such a method, it is necessary to preheat the metal plate in order to improve the adhesion between the resin and the metal plate. However, since the heat capacity of the metal is large, high productivity is required. When the line speed is increased in order to obtain, the cooling roll 10 cannot be sufficiently cooled, and the resin coated on the metal plate is peeled off from the cooling roll 10 in a state of having an adhesive property,
There is a problem that the resin sticks to the cooling roll and the resin floats up from the metal plate, and finally, the lifted resin is wound around the cooling roll 10 and becomes inoperable.

In order to solve such a problem, the present inventors have proposed the following method in Japanese Patent Application Laid-Open No. Hei 1-301317. In the method described in the publication (hereinafter referred to as a proposed method), as shown in FIG. 7, a metal plate 3 preheated by a preheating device (not shown) is wound around a metal cooling roll 1, and the metal plate 3 wound around the cooling roll is A rubber nip roll 2 made of silicon rubber, chloroprene rubber, polytetrafluoroethylene rubber or the like is pressed into contact with the surface of the metal plate 3 and the nip roll 2.
The molten thermoplastic resin 6 flows down from the T-die 5 through the extruder 4 to the interface of the metal plate 3 and is laminated on the metal plate 3.

According to such a method, the resin 6 comes into contact with the metal cooling roll as in the conventional method, comes into contact with the rubber nip roll without peeling, peels off, and is laminated on the metal plate. Rubber has poor adhesion to a resin having tackiness as compared with metal, in other words, rubber has better releasability from the resin than metal.

Therefore, according to the proposed method in which the resin comes into contact with the rubber nip roll, peels off, and is laminated on the metal plate, it is determined by the releasability from the roll that comes into contact with the adhesive resin as described above. The maximum line speed (maximum production speed) can be greatly improved as compared with the conventional method in which the metal cooling roll and the resin come into contact with each other and peel off. Also, when manufacturing a laminated metal plate by a conventional method, it is necessary to preheat the metal plate in order to improve the adhesion between the resin and the metal plate as described above, and further increase the preheating temperature of the metal plate, After the resin is coated on the metal plate, it is necessary to maintain the temperature as high as possible until the resin is forcibly cooled to a temperature at which it can be wound by a downstream cooling device, for example, to room temperature, in order to improve the adhesion.

On the other hand, from the viewpoint of energy cost, it is best to produce a laminated metal plate having excellent adhesion by low-temperature preheating. However, in the conventional method, the resin is coated with a metal cooling roll immediately after coating. Because the metal plate is cooled, when the preheating temperature is low, the temperature of the metal plate until it is forcibly cooled by the cooling device decreases, and a laminated metal plate with excellent adhesion is manufactured. There is a problem that it is not possible.

In order to solve such a problem, the present inventors have proposed the following method in Japanese Utility Model Application No. 2-86442.
In the method described in Japanese Utility Model Application No. 2-86442 (referred to as the prior application method), as shown in FIG. 7, a metal plate 3 preheated by a preheating device (not shown) is cooled by providing a heat insulating layer on the outer peripheral surface of a roll drum. Roll 1
(For example, an iron hollow roll, in which a cooling medium such as water is circulated through a water supply / drain port provided on the roll shaft, and a silicone rubber or poly 4
A rubber nip roll 2 made of, for example, silicon rubber, chloroprene rubber, polytetrafluoroethylene rubber, or the like, is pressed against the metal plate 3 wound around the roll 1 to form a metal plate. 3
The interface between the surface and the nip roll 2 is passed through an extruder 4 to form a T
The molten thermoplastic resin 6 flows down from the die 5 and the metal plate 3
The laminated metal plate 8 is obtained by, for example, cooling to, for example, normal temperature in a cooling device 7 provided with, for example, a water spray nozzle downstream of the roll 1.

According to the prior application method, since the laminated metal plate 8 is wound around the cooling roll 1 provided with the heat insulating layer on the outer peripheral surface of the roll drum, the winding of the laminated metal sheet 8 is more difficult than the conventional method wound around the cooling roll 10. The amount of temperature decrease is significantly reduced, and the temperature of the laminated metal plate 8 (hereinafter, referred to as the heat retention temperature of the laminated metal plate) after being coated with the resin and before being forcibly cooled is significantly increased. As described above, if the preheating temperature of the metal plate 3 is low and the heat retention temperature of the laminated metal plate is low, excellent adhesion cannot be obtained, so that the heat retention temperature for obtaining excellent adhesion is secured. In the conventional method, the temperature drop due to roll winding is large, so the preheating temperature of the metal plate needs to be greatly increased, but in the prior application method, the temperature drop due to roll winding is small, so it is necessary to increase the preheating temperature as in the conventional method. Absent. That is, according to the prior application method, the preheating temperature required to secure a heat retention temperature for obtaining excellent adhesion can be significantly reduced as compared with the conventional method.

In the example of the apparatus for manufacturing a laminated metal plate shown in FIG. 7, a rubber nip roll is used as the nip roll 2, but since the preheated metal plate 3 is not wound around the nip roll 2, for example, iron or copper is used. Even if a metal water-cooled roll such as that described above is employed, the above-described effects can be obtained. Further, in the above apparatus example, in order to shorten the cooling line length, the water spray type cooling apparatus 7 is provided so as to cool the laminated metal plate 8 to normal temperature. It may be configured to cool by natural cooling.

Further, in the above example of the manufacturing apparatus, only the thermoplastic resin flows down from the T-die, but the thermoplastic resin and the adhesive thermoplastic resin may be co-extruded using two extruders. As a metal plate, steel plate (including foil), aluminum plate (including foil), or any of the following surface treatments on the surface of these metal plates: Sn, Zn, Al, Pb, Ni, Cr or Cu plating Composite plating of two or more of the above-mentioned metals; alloy plating containing one or more of the above-mentioned metals; and plating of composite plating mainly containing one or more of the above-mentioned metals. Plates treated with chromate or phosphate can also be used.

The thermoplastic resin used for the coating is typically a polyester resin, a polyolefin resin, a vinyl chloride resin, a polycarbonate resin, or the like.

[0014]

In the case of manufacturing a laminated metal plate by such a proposed method and the prior application method, it is possible to operate without any problem if the resin is coated with a width smaller than the width of the metal plate. The end portion that is not covered with the resin does not become a product, and the portion needs to be trimmed in a later process, and the yield decreases. Also, there are many metal plates on the production line.
There is a phenomenon (wave) that fluctuates in the width direction from about mm to several tens of mm (walk), and adjusts the resin coating width according to the movement,
It is impossible in practical operation to completely match the width of the metal plate with the width of the resin coating. Also, to cover the resin with a width wider than the metal plate width to increase product yield,
When the roll is wound around a cooling roll provided with a heat insulating layer on the outer peripheral surface of the roll cylinder, the resin coated over the width of the metal plate adheres to the roll due to the high surface temperature of the roll, Even when a metal cooling roll having good cooling performance is used to lower the temperature, the resin coated with a width larger than the width of the metal plate sticks to the roll because the metal and the resin are not easily separated. In that case, there is a problem that the resin coated wider than the metal plate is torn off from the resin coated on the metal plate and is wrapped around the cooling roll, thereby making the operation impossible.

The present invention solves the above problems and provides a method for producing a laminated metal plate having excellent corrosion resistance and adhesion with good yield.

[0016]

The gist of the present invention is as follows. (1) A nip roll is pressed into contact with a preheated metal plate wound around a cooling roll, and a thermoplastic resin film melted from a T-die through an extruder flows down near the interface between the nip roll and the metal plate to form a metal plate. In the method of manufacturing a laminated metal plate to coat a thermoplastic resin film on the contact surface of the metal plate with the cooling roll, between the contact surface of the cooling roll with the metal plate, the width of the metal plate The soft thin material with a wide width is interposed so that both ends in the width direction of the soft thin material are located outside the both ends in the width direction of the metal plate, and the thermoplastic material flows down near the interface between the metal plate and the nip roll. A laminate characterized in that the width of the resin film is larger than the width of the metal plate and smaller than the width of the soft thin material so as to cover the metal plate and the soft thin material on both outer sides in the width direction of the metal plate. Metal plate manufacturing method

(2) A nip roll is pressed against a preheated metal plate wound around a cooling roll, and a thermoplastic resin film melted from a T-die through an extruder flows down near an interface between the nip roll and the metal plate. In the method for manufacturing a laminated metal plate for coating a metal plate with a thermoplastic resin film, contact surfaces of the metal plate with the cooling rolls at both ends in the width direction of the metal plate, and both ends of the cooling roll in the width direction of the metal plate. Between the contact surface with the part, two soft thin materials with a width smaller than the width of the metal plate, such that one end in the width direction of each soft thin material is located outside the one end in the width direction of the metal plate. While intervening to be located,
The width of the thermoplastic resin film flowing down near the interface between the metal plate and the nip roll is larger than the width of the metal plate, and smaller than the distance between the ends of the soft thin material located outside both ends of the metal plate. And a method of manufacturing a laminated metal plate, wherein a soft thin material at both ends in the width direction of the metal plate is covered.

As the soft thin material used in the present invention, a plastic film, paper or the like is suitable because of its low cost.
The cooling roll used in the present invention is a water-cooled roll of an internal cooling type made of metal such as iron or copper, a cooling roll for cooling with air or the like instead of water, and a heat insulating layer of rubber or resin on the outer peripheral surface of the roll body. Cooling rolls provided.

Hereinafter, the present invention will be described in detail. In the present invention, as shown in FIG. 1, a metal plate 3 discharged from a metal plate unwinding reel 11 is preheated by, for example, a gas heating type preheating device 12 and wound around a cooling roll 1 via a turndown roll 13. The nip roll 2 is pressed against the metal plate 3 wound around the roll 1, the molten thermoplastic resin 6 flows down from the T-die 5 through the extruder 4 at the interface between the surface of the metal plate 3 and the nip roll 2, and the metal plate 3 When laminating the flexible thin material unwinding reel 14 as shown in FIGS.
W15 wider than the width W3 of the metal plate 3 paid out from
Between the contact surface of the metal plate 3 with the cooling roll 1 and the contact surface of the cooling roll 1 with the metal plate 3, both ends of the soft thin material 15 in the width direction of the metal plate 3. And the width W6 of the thermoplastic resin 6 flowing down near the interface between the metal plate 3 and the nip roll 2 is larger than the width W3 of the metal plate 3 and is made of a soft thin material. 15 smaller than the width W15 of the metal plate 3
And a cooling device that covers the soft thin material 15 on both ends outside in the width direction of the metal plate 3, and the laminated metal plate 3 and the coated soft thin material 15 are provided with a downstream water spray nozzle, for example. At 7, for example, cool to room temperature,
For example, drying is performed by a drying device 16 having a hot air generator, and furthermore, the thermoplastic resin 6 and the soft thin material 15 which are covered more widely than the metal plate 3 are trimmed by a trimming device 17 having a metal blade or a rotary blade, and then a guide is provided. The soft thin material 15 is peeled off from the upper surface of the metal plate 3 by a soft thin material take-up reel 19 via a roll 18 to obtain a laminated metal plate 8 and wound on a laminated metal plate take-up reel 20.

As described above, according to the present invention, the contact surface of the metal plate 3 with the cooling roll 1 and the metal plate 3 of the cooling roll 1
Width W wider than width W3 of metal plate 3
The soft thin material 15 is interposed so that both ends in the width direction of the soft thin material 15 are located outside the both ends in the width direction of the metal plate 3 and flows down near the interface between the metal plate 3 and the nip roll 2. The width W6 of the thermoplastic resin 6 to be formed is larger than the width W3 of the metal plate 3 and smaller than the width W15 of the soft thin material 15 so that the soft thin material 15 at both ends in the width direction of the metal plate 3 and the metal plate 3 is formed. Since the coating is performed, the thermoplastic resin 6 coated wider than the metal plate 3 can be prevented from sticking to the roll 1, and can be operated satisfactorily, and the product yield of the laminated metal plate can be increased. it can.

In order to reduce the cost of the soft thin material, as shown in FIG. 3, the contact surfaces of the metal plate 3 at both ends in the width direction with the cooling roll 1 and the width of the metal plate 3 of the cooling roll 1 are set. The soft thin materials 15, 15 having a width W15 smaller than the width of the metal plate 3 are discharged from the soft thin material unwinding reels 14, 14 between the contact surfaces with the opposite end portions in the direction. 15,1
5 is disposed so that one end in the width direction of the metal plate 3 is located outside the one end in the width direction of the metal plate 3 and the width W of the thermoplastic resin 6 flowing down near the interface between the metal plate 3 and the nip roll 2.
6 is larger than the width W3 of the metal plate 3 and smaller than the distance B between the ends of the soft thin materials 15 and 15 located outside both ends of the metal plate 3 so that the metal plate 3 and the metal plate 3 Even if the soft thin materials 15 on both ends in the width direction are covered, it is also possible to similarly prevent the thermoplastic resin 6 coated wider than the metal plate 3 from sticking to the cooling roll 1. Thus, the product yield of the laminated metal plate can be increased.

As a method of interposing the soft thin material 15 between the metal plate 3 and the cooling roll 1, besides the method shown in FIG. 1, for example, as shown in FIG. It is also possible to adopt a method of arranging the material pressing roll 21 and the holding roll 22 and pressing the soft thin material 15 to the metal plate 3. In the example shown in FIG. 1, the thermoplastic resin 6 and the soft thin material 15 covered wider than the metal plate 3.
Is trimmed and then the soft thin material 15 is peeled off. However, a method is used in which the soft thin material 15 is first peeled off from the upper surface of the metal plate 3 and then the thermoplastic resin 6 remaining on both ends of the metal plate is trimmed. You may. Further, as shown in FIG. 5, when the peeled soft thin material 15 is connected to the soft thin material 15 interposed between the metal plate 3 and the cooling roll 1 to form a continuous band, and the soft thin material 15 is further peeled off. The soft thin material 15 from which the resin 6 coated wider than the metal plate 3 is peeled off
Alternatively, a method including a scraping device 23 for removing when stuck to the surface may be adopted.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As a cooling roll 1 of FIG. 1, an inside of an iron roll having an outer diameter of 410 mm is water-cooled, and a roll having an outer diameter of 450 mm coated with a 20 mm-thick silicon rubber is used as a nip roll 2. Using an apparatus for manufacturing a laminated metal plate using a silicon rubber nip roll, an electrolytic chromic acid-treated steel plate having a thickness of 0.2 mm and a width of 800 mm was used as the metal plate 3, and after preheating this steel plate to 200 ° C., The polyethylene terephthalate was melt-extruded and flowed down from the T-die 5 through the extruder 4 to the interface between the nip roll 2 and the nip roll 2. The temperature of the molten resin 6 is 280 ° C., the coating thickness is 50 μm, the coating width is 860 mm, the coating is 30 mm wider on both sides than the steel plate, and the line speed is 50 m.
/ Min, and the angle at which the steel sheet is wound around the cooling roll 1 after pressing is 90 °. Thickness 2 as soft thin material 15
A biaxially stretched polyethylene terephthalate film having a thickness of 0 μm and a width of 920 mm was coated on both sides of the metal plate 3 so as to project 60 mm each. The laminated steel sheet arrives at the cooling device 7 downstream of the cooling roll 1 three seconds after the pressing, is cooled to room temperature by water spray, is dried, and then trims the resin and the film coated more widely than the metal plate 3, Thereafter, the film was peeled off by the soft thin material take-up reel 19, and the steel plate was wound up to obtain a laminated steel plate. The operability was good, and a laminated steel sheet having excellent performance could be obtained with good yield. Next, as the soft thin material 15, the thickness 2
A biaxially stretched polyethylene terephthalate film having a width of 0 μm and a width of 90 mm is coated on both ends of the metal plate 3 by 60 mm outside and 30 mm inside, respectively, from the end of the metal plate 3. Was manufactured.
In this case, the operability was also good.

Similar results were obtained by using a water-cooled roll having an outer diameter of 450 mm whose surface was hard chromium-plated as the cooling roll 1. As a comparative example, when the cooling roll 1 was operated without using a biaxially stretched polyethylene terephthalate film as a soft thin material in the above example, the cooling roll 1 had an outer diameter of 45 mm with an outer surface coated with a 20 mm thick silicone rubber.
Regardless of whether the roll is 0 mm or a metal water-cooled roll whose surface is hard chromium-plated, the resin 6 coated wider than the metal plate adheres to the cooling roll 1 around which the steel plate is wound, and It was wrapped around and became inoperable.

[0025]

As described above in detail, according to the present invention, a laminated metal plate having excellent corrosion resistance and adhesion can be manufactured with good yield.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an embodiment of the first aspect of the present invention.

FIG. 2 is a detailed explanatory view of the first embodiment of the present invention.

FIG. 3 is a detailed explanatory view of a second embodiment of the present invention.

FIG. 4 is an explanatory diagram showing an embodiment of the second aspect of the present invention.

FIG. 5 is an explanatory diagram showing another embodiment of the present invention.

FIG. 6 is an explanatory view of a conventional method.

FIG. 7 is an explanatory diagram of the prior application method.

[Explanation of symbols]

 Reference Signs List 1 cooling roll, 2 nip roll, 3 metal plate, 4 extruder, 5 T die, 6 thermoplastic resin, 7 cooling device, 8 laminated metal plate, 9 heating roll, 10 cooling roll, 11 metal plate unwinding reel, 12 preheating Device, 13 turn-down roll, 14 soft thin material unwinding reel, 15 soft thin material, 16 drying device, 17 trimming device, 18 guide roll, 19 soft thin material winding reel, 20 laminated metal plate winding reel, 21 soft Thin material pressure roll, 22 holding roll, 23 resin scraping device.

Claims (2)

(57) [Claims] 1. A nip roll is pressed into contact with a preheated metal plate wound around a cooling roll, and a thermoplastic resin film melted from a T-die through an extruder flows down near an interface between the nip roll and the metal plate. In the method for manufacturing a laminated metal plate for coating a metal plate with a thermoplastic resin film, the contact surface of the metal plate with the cooling roll, between the contact surface of the cooling roll with the metal plate, the metal plate A soft thin material having a width wider than the width is interposed so that both ends in the width direction of the soft thin material are located outside both ends in the width direction of the metal plate, and flows down near the interface between the metal plate and the nip roll. The width of the thermoplastic resin film is larger than the width of the metal plate, and smaller than the width of the soft thin material, so as to cover the metal sheet and the soft thin material at both ends outside in the width direction of the metal plate. Made of laminated metal plate Construction method. 2. A nip roll is pressed into contact with a preheated metal plate wound around a cooling roll, and a thermoplastic resin film melted from a T-die through an extruder flows down near an interface between the nip roll and the metal plate. In the method for manufacturing a laminated metal plate for coating a metal plate with a thermoplastic resin film, the contact surfaces of the metal plate with both ends in the width direction of the metal plate and the cooling roll, and both ends of the cooling roll in the width direction of the metal plate. The two soft thin materials having a width smaller than the width of the metal plate are placed between the contact surfaces of the metal plates with one end in the width direction of each of the soft thin materials located outside the one end in the width direction of the metal plate. The width of the thermoplastic resin film flowing down near the interface between the metal plate and the nip roll is larger than the width of the metal plate, and the distance between the ends of the soft thin material positioned outside both ends of the metal plate. Smaller than the metal plate and the width of the metal plate A method for manufacturing a laminated metal plate, wherein soft thin materials on both outer sides in two directions are covered.