JP3100795B2 - 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 thermoplastic resin-coated metal sheet having excellent adhesion, workability, corrosion resistance and appearance with good yield.

[0002]

2. Description of the Related Art Conventionally, as a surface-treated metal sheet coated with a synthetic resin, a color steel sheet obtained by applying a thermosetting acrylic resin paint or a polyester resin paint or a laminated steel sheet obtained by laminating a resin film is known. .

Because of their beautiful colors, appearance and corrosion resistance, they are widely used in applications such as construction, interior materials for buses and passenger cars, materials for home electric appliances, and furniture furniture.

[0004] However, the resin used for the paint is
Due to the necessity of coating workability, those with relatively low molecular weight are used, and the high molecular weight is not sufficient even by baking and hardening after coating, and the flow on the metal substrate is not sufficient, and the defect that durability is lacking there were.

[0005] On the other hand, a laminated steel sheet on which a resin film is laminated uses a film extruded from a resin such as a vinyl chloride resin, an acrylic resin, or a fluororesin, which has a consistently high molecular weight at a petrochemical plant. The molecular weight is much higher than that of the resin for coating, and therefore, the durability of the coating film on the substrate is much longer, for example, about 10 to 20 years, compared with 3 to 5 years for coating. It is.

However, in this case, there are various problems as follows. (1) When the thickness of the film is reduced, uniform lamination on the substrate becomes difficult, and phenomena such as wrinkles appear on the surface. Therefore, the thickness is usually limited to about 50 μm.

(2) Since there are microscopic irregularities on the substrate, a space is easily generated between the solidified film and the substrate, and the adhesion of the film is insufficient.

(3) Since the resin is once formed into a film, the resin used is restricted in terms of film forming ability.

[0009] On the other hand, a metal substrate is heated with a heating roll.
Is preheated to a temperature in the range of ~ 170 ° C, and then proceeds through the gap between the heating roll and the cooling roll. It has been reported that by being press-bonded, a beautiful appearance can be obtained, and a surface-treated metal sheet having more excellent adhesion and corrosion resistance than conventional color steel sheets or laminated steel sheets can be obtained (Japanese Unexamined Patent Publication (Kokai) No. 2002-282686). No. 57-203545).

This metal plate has much better adhesion and corrosion resistance to a substrate than a conventional metal plate. further,
Since the coating is performed in a molten state directly from the T-die without forming into a film, the film thickness is also 50 μm or less, which is difficult with conventional film coating, and 35 μm or less.
Coating up to about μ thickness was made possible.

Since the durability of the surface-treated metal sheet is greatly affected by the type and thickness of the thermoplastic resin, it is desirable to be able to control the thickness in accordance with the required degree of durability and price requirements. However, coating with a thin film has been made possible by the present invention.

Further, for example, a hard resin or the like can be formed into a film, but is easily broken, and it is difficult to form the film once and then press it on a metal plate. Since the resin is coated in a state having properties, such a hard resin can be used.

In addition, since the film forming step is omitted, there is an advantage that the cost is reduced.

[0014]

However, the molten thermoplastic resin film flowing down from the slit-shaped opening of the T-die narrows (neck-in) as it flows down from the opening, and the thermoplastic resin film below the opening is opened. The resin flow rate per unit width in the width direction of the film is uniform at the center but is larger at both ends than at the center.

When the thickness of the thermoplastic resin film is equal to or smaller than the width of the metal plate, the thickness of the coating resin in the width direction of the obtained laminated metal plate becomes non-uniform, and the width in the width direction, which is the portion where the coating thickness is non-uniform, is not uniform. Both end portions do not become products, and the portions need to be trimmed in a later process, and the product yield is greatly reduced.

For this purpose, it is necessary to cover (overcoat) a metal plate with a width larger than the width of the metal plate. However, the overcoat resin adheres to the wound roll and the operation becomes impossible.

Therefore, there is a method using a soft thin material as shown in Japanese Patent Application Laid-Open No. 3-158235 (FIG. 2), but the cost of the soft thin material is high.

The present invention solves such a problem due to neck-in, and is excellent in adhesion, workability, corrosion resistance, and appearance.
Provided is a method for producing a thermoplastic resin metal plate having a good yield.

[0019]

That is, the present invention provides: (1) a preheated metal plate wound on a winding roll;
In a method of manufacturing a laminated metal plate by pressing a pressure roll and pressing a thermoplastic resin film melted from a T-die through an extruder into a gap between the pressure roll and the metal plate to cover the metal plate with the thermoplastic resin. The width of the thermoplastic resin film flowing down into the gap between the pressure roll and the metal plate is made larger than the width of the metal plate, and the central portion of the thermoplastic resin film in the width direction covers the entire width of the metal plate. In order to prevent the thermoplastic resin film flowing down larger than the width from adhering to the winding roll, a gas is injected from a hole opened on the surface of the winding roll in a portion where the resin is overcoated to spray the resin film. A method for producing a laminated metal sheet, comprising: spraying a cooling medium onto a surface of a thermoplastic resin film in a portion where a resin is overcoated and cooling the resin to be separated from a winding roll;

(2) A pressing roll is pressed against a preheated metal plate wound around a winding roll, and a thermoplastic resin film melted from a T-die through an extruder in a gap between the pressing roll and the metal plate. In the method of manufacturing a laminated metal plate by coating the thermoplastic resin on the metal plate by flowing down, the width of the thermoplastic resin film flowing down into the gap between the pressure roll and the metal plate, larger than the width of the metal plate, The resin is overcoated to cover the entire width of the metal plate at the center in the width direction of the thermoplastic resin film and to prevent the thermoplastic resin film flowing down larger than the width of the metal plate from adhering to the winding roll. The resin film is peeled off from the winding roll by injecting gas from a hole opened on the surface of the winding roll of the portion, and the cooling roll is pressed against the surface of the thermoplastic resin film of the resin overcoated portion. cold Method for producing a laminated metal sheet, which comprises,

(3) A pressing roll is pressed against the preheated metal plate wound around the winding roll, and a thermoplastic resin film melted from a T-die through an extruder in a gap between the pressing roll and the metal plate. In the method of manufacturing a laminated metal plate by coating the thermoplastic resin on the metal plate by flowing down, the width of the thermoplastic resin film flowing down into the gap between the pressure roll and the metal plate, larger than the width of the metal plate, The resin is overcoated to cover the entire width of the metal plate at the center in the width direction of the thermoplastic resin film and to prevent the thermoplastic resin film flowing down larger than the width of the metal plate from adhering to the winding roll. The resin film is peeled off from the winding roll by injecting gas from a hole opened on the surface of the winding roll of the wound portion, and both ends in the width direction of the winding roll of the portion where the resin is overcoated,
A method for manufacturing a laminated metal plate, comprising pressing a cooling roll and or injecting a cooling medium and cooling in advance.

(4) A pressing roll is pressed against the preheated metal plate wound around the winding roll, and a thermoplastic resin film melted from a T-die through an extruder through a gap between the pressing roll and the metal plate. In the method of manufacturing a laminated metal sheet by coating a metal sheet with a thermoplastic resin by flowing down, the width of the thermoplastic resin film flowing down into the gap between the pressure roll and the metal plate is set to be larger than the width of the metal plate. The resin was overcoated to cover the entire width of the metal plate with the central portion in the width direction of the thermoplastic resin film and to prevent the thermoplastic resin film flowing down larger than the width of the metal plate from adhering to the winding roll. The resin film is peeled off from the winding roll by injecting gas from a hole opened on the surface of the winding roll, and the cooling roll is pressed against both ends in the width direction of the winding roll where the resin is to be overcoated. Do Alternatively, while cooling in advance by spraying a cooling medium, the cooling roller is pressed against the surface of the thermoplastic resin film in the portion where the resin is overcoated, and / or the cooling medium is sprayed and cooled. A method for producing a laminated metal plate.

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

In the present invention, first, a roof,
Used for building materials such as walls and partitions, automotive materials, home electric products, furniture, cans, etc. A plated steel plate, an aluminum-plated steel plate, an aluminum alloy-plated steel plate, a stainless steel plate, or the like is used.

Further, those having a chemical conversion treatment layer of about 0.1 to 5 μm thereon are also included.

The chemical conversion treatment is carried out as a surface treatment of a metal plate in order to improve the corrosion resistance, oxidation resistance and adhesion of the metal substrate. For example, a zinc phosphate treatment, an iron phosphate treatment, or an electrolytic chromate treatment Done by

[0027] Further, there may be included those without a chemical conversion treatment or after having been subjected to a chemical conversion treatment and having an adhesive layer thereon.

The adhesive layer is a layer coated with an adhesive of at least several μm in order to improve the adhesion between the metal substrate and the thermoplastic resin.

As the adhesive, an adhesive thermoplastic resin having a functional group such as a modified polyethylene resin, a modified epoxy resin, and a modified vinyl resin is preferable.

These have good adhesion to both the metal and the thermoplastic resin used for coating. For example, in the case of a polyolefin-coated steel sheet, such as ethylene-vinyl acetate copolymer resin or ethylene-acrylic acid copolymer resin is used. Modified polyolefins are preferred.

The thermoplastic resin used for coating in the present invention is, for example, polyethylene terephthalate resin, polyolefin resin, acrylic resin, polyester resin, polyamide resin, vinyl chloride resin, fluororesin, polycarbonate resin, polystyrene resin, ABS resin, chlorine resin. Polyether resins, urethane resins and the like are typical. Polyolefin resins include polymers or copolymers such as ethylene, propylene, 1-butene and 1-pentene, and acrylic resins such as acrylic acid and There are polymers or copolymers such as acrylic acid, acrylic acid ester, methacrylic acid ester, and acrylamide. Polyester resins include polyethylene terephthalate and oil-free polyester. Polyamide resins include so-called nylon 66 and nylon. Down 6, nylon 610, nylon 1
In addition to homopolymers, vinyl chloride resins include, for example, copolymers with ethylene and vinyl acetate, and fluorine resins include ethylene tetrafluoride resin, ethylene trifluoride chloride resin, and hexafluoroethylene resin. Ethylene propylene resin, vinyl fluoride resin, vinylidene fluoride resin and the like.

Further, two or more resins may be mixed and used. Further, it may contain an additive usually used at the time of film formation, for example, a deterioration inhibitor, a modifier, a pigment and the like.

When coating in a molten state, a crosslinking agent such as an amino resin or an epoxy resin may be added to the extent that fluidity is not lost.

These thermoplastic resins are required to have weather resistance, suitability for cold regions, heat resistance, scratch resistance, stain resistance, chemical resistance, deep drawing workability, etc., depending on the use of the surface-treated metal sheet. Is appropriately selected according to the conditions. For example, polyolefins have excellent cold resistance, polyamides have excellent wear resistance,
Acrylic resin is excellent in stain resistance and chemical resistance, and fluorine resin is excellent in weather resistance.

The polyethylene terephthalate resin is particularly useful for acid-resistant applications.

The resin may be a single layer coating or a multilayer coating of the same or different resins. In the case of multi-layer coating, for example, a multi-layer T die is used, and an adhesive layer can be provided between layers.

For example, on a steel sheet coated with an adhesive and preheated, a thermoplastic resin in a molten state is used as a lower layer, an adhesive resin is used as an intermediate layer, and a thermoplastic resin is used as an upper layer. It is possible to obtain a surface-treated steel sheet which is extruded into a film form and directly and continuously multi-layer coated, or an adhesive resin in a molten state on a preheated steel sheet as a first lower layer,
Surface treatment of extruding thermoplastic resin into the second intermediate layer, adhesive resin into the third intermediate layer, and thermoplastic resin into the fourth uppermost layer in the form of a film with a four-layer T-die, and directly and continuously multilayer coating. Steel sheet can be obtained.

Next, the manufacturing process will be described with reference to the drawings.

The metal substrate needs to be preheated before coating with the molten resin.

For example, in the case of polyethylene terephthalate, the melting point (255 ° C.) is −120 ° C. or more (therefore, 135 ° C.).
(About 255 ° C.) is preferable.

Preheating increases the fluidity of the resin and improves the adhesion.

When preheating is not performed, or when the preheating temperature is low, especially when a cooling roll is used, the adhesion of the resin is not sufficient, resulting in a lack of corrosion resistance.

A higher preheating temperature is preferable because the fluidity of the resin increases, but an excessively high preheating temperature is not preferable because the resin and the adhesive are decomposed. It is not preferable from the viewpoint of energy saving.

Therefore, the preheating is performed at a temperature lower than the temperature of the molten resin, preferably at a temperature lower by at least 50 ° C. than the temperature of the molten resin, usually about 50 to 230 ° C.

FIG. 1 shows that a pressing roll 5 is pressed against the surface of a preheated metal substrate 1 wound around a winding roll 4, and an interface between the surface of the metal substrate and the pressing roll 5 is passed through an extruder to form a T 1 shows a method of manufacturing a laminated metal plate in which a molten thermoplastic resin film 3 flows down from a die 2 and a thermoplastic resin film is coated on a metal substrate 1.

In this method, the film thickness and the surface condition can be easily adjusted. For example, it is easy to adjust the gloss of the surface and to give the surface an embossed pattern.

Metal substrate 1 coated with high-temperature molten resin 3
Is subjected to cooling and winding. Cooling, for example, after air cooling
You can spray with water or go through a water cooling tank,
It may be passed through a cooling roll.

In this way, the surface-treated metal plate of the present invention is obtained. In the present invention, since a hole is formed in the surface of the winding roll covered with the thermoplastic resin film in the axial direction, The area of the resin covering the roll surface is reduced by the opening area, and the adhesive force of the resin to the roll surface is reduced by that amount.

Further, since a gas supply mechanism for supplying gas to the opening of the opening covered by the thermoplastic resin film behind the pressure contact position is provided, the winding roll can be disturbed without disturbing the thermoplastic resin film flowing down from the T-die. The resin film covering the surface floats by the gas.

Further, the gas injected between the floating resin film and the roll surface flows, so that the resin film is cooled and the roll surface is also cooled, so that the adhesive force of the resin to the roll surface is further reduced.

FIG. 3 is a sectional view of the apparatus, and FIGS.
XX direction diagram, YY direction diagram, Z in FIG.
FIG.

As shown in FIGS. 3 and 4, in the present invention, a winding roll (roll winding) through which a preheated metal plate 1 is wound and passes.
4 surface, a width W _P of the thermoplastic resin 3, and wider than the plate width W _M of the metal plate 1, the thermoplastic resin covering the opening of the winding roll surface, the axial direction of a portion covering The nip roll (compression roll) 5 is provided with a hole to be opened, and gas is injected from the hole at a position behind the pressure contact position of the nip roll (pressure roll) 5.

FIG. 3 shows that a wind box that slides on the inner peripheral surface of the roll is provided as a method of supplying gas to the holes.

In FIG. 3, the gas is injected in the area where the metal plate 1 is separated from the winding roll 4 behind the pressure contact position of the nip roll 5, but the wind box is extended and the thermoplastic resin is coated. Injecting a gas on the unwound roll surface also lowers the roll surface temperature, which can promote cooling of the thermoplastic resin coated on the roll surface.

Further, if the wind box is divided in the circumferential direction, the strength of the gas injection can be increased or a finer gas injection pattern can be realized.

However, the position at which the gas is injected should be set so that the molten thermoplastic resin flowing down from the T-die does not shake or stably cannot flow down. It is necessary to select an appropriate position depending on the plastic resin.

In FIG. 5, on the outer periphery of the metal sleeve 51,
A hole which is lined with a thermoplastic resin and a rubber having good releasability, for example, a polytetrafluoroethylene rubber 52, is provided in a portion covered with the thermoplastic resin by a hole 10 penetrating in the thickness direction of the winding roll.
Is provided.

Further, for supplying gas to the holes, a wind box 9 sliding on the inner peripheral surface of the roll is provided, and gas is supplied to the wind box by a gas supply pipe 61.

Note that this wind box is
Since it is connected to the shaft portion and is pressed against the inner peripheral surface of the roll by the spring 58 inserted into the socket, there is little leakage of gas to be injected.

Further, the shaft structure of this device is a double tube structure of an outer tube 55 and a shaft 54, and a movable portion 53 is provided between the outer tube and the shaft. A long hole 63 is opened in the outer tube in the axial direction, so that the socket 56 can move in the axial direction.

As for the moving mechanism, the movable part and the shaft have a relationship of a nut and a bolt, and the movable part moves with the rotation of the shaft.

That is, by rotating the shaft, the wind box can be moved in the axial direction together with the socket. Therefore, it is possible to cope with a change in the width of the metal plate to be passed.

If the jet width of the wind box in the direction of the winding roll axis is the same as the width of the thermoplastic resin covering the roll surface, the jet gas can be effectively jetted to the thermoplastic resin.

This device has a structure in which the shaft is fixed and only the sleeve 51 rotates via the bearing 59.

FIG. 6 shows the positions of the holes to be opened. The opening hole is the minimum width W _M m of the metal plate to be passed.
It is preferable to provide in a region from “in” to the resin width W _P max of the thermoplastic resin covering the roll surface in the maximum plate width W _M max.

FIG. 7 shows an enlarged view of the hole. The shape of the hole may be any shape such as a round shape, a square shape, a rectangular shape, and a rhombus shape.

As shown in FIG. 7, the holes are preferably arranged as densely as possible in order to reduce the surface area of the roll of the thermoplastic resin.

Further, regarding the structure of the hole, U-U sectional views in FIG. 7 are shown in FIGS. As shown in FIGS. 8 and 9, a structure in which the hole diameter on the roll surface side is larger than the hole diameter on the roll inner surface side in order to reduce the roll surface covering area of the thermoplastic resin while injecting gas vigorously, for example,
A two-step hole structure (FIG. 8) and a tapered hole structure (FIG. 9) are preferable.

The size of the hole on the roll surface is shown in FIG. 11 in order to prevent the thermoplastic resin from being injected into the hole by pressing at the position where the thermoplastic resin is pressed against the nip roll as shown in FIG. It is better to make the hole larger than the nip width of the nip roll.

In the above examples, the holes are formed as through holes, but they may be formed as non-through holes as shown in FIGS. The gas supply direction at this time is preferably the roll surface or the roll end surface.

As a method of supplying the gas to be injected, other than a wind box, a method of disposing a nozzle with a gap and a hole, a method of directly sliding a gas supply pipe, or a method of disposing a gap can be used. is there.

Further, in the present invention, a cooling medium is sprayed on the overcoated resin, or a cooling roll is pressed against the resin, or both ends in the width direction of the winding roll of the portion where the resin is overcoated are cooled with the cooling roll. Pre-cooling by pressing and / or spraying a cooling medium, or by using these two or more methods in combination, promotes the cooling and solidification of the resin, and the adhesion between the surface of the winding roll and the overcoat resin. And facilitates peeling from the winding roll.

If the temperature of the resin is high, the resin sticks and easily sticks to the winding roll, and the resin itself is soft.
It is torn and clings to the wrapping roll.

By lowering the temperature of the surface of the winding roll, the adhesion to the resin is reduced, and although indirect, the cooling and solidification of the resin are promoted, and the resin is easily peeled off from the winding roll.

Next, this will be described with reference to the drawings.

FIG. 15 shows a case in which a cooling medium is sprayed on the surface of the thermoplastic resin film 3 through the cooling nozzle 11 to cool it, and a case in which the winding roll is cooled by the cooling nozzle and / or the cooling roll and gas is injected. FIG.
A cooling roll may be used instead of or simultaneously with the cooling nozzle.

As the cooling medium, air, water, steam-water (mist) in which water and air are mixed, liquid nitrogen, and the like are preferable from the viewpoint of economy and cooling capacity.

In order not to cool the metal plate itself, a partition may be provided at the end of the metal plate so that the cooling medium does not fall on the metal plate.

The winding roll is preferably made of Teflon or silicon in order to reduce the adhesion of the resin.

The cooling roll is preferably made of copper or iron from the viewpoint of the cooling effect.

As described above, by using the gas jetting roll and the cooling of the overcoat resin together, 100 m / m
The high-speed operation of about in can be performed stably.

The following is a description of embodiments.

[0083]

[Embodiment 1] Finally, an embodiment using this apparatus will be described.

In the apparatus as shown in FIG. 14, a metal plate wound around a metal plate 51 is preheated by a winding roll 4 in which the outer surface of a metal sleeve 51 is coated with polytetrafluoroethylene rubber 52. A winding roll 4 having a hole extending from the inside of the roll to the outside in the axial direction of the roll was installed in the vicinity of the roll surface where the resin protruding from the plate was in contact when the roll 1 was wound.

Further, the wind box 9 was installed so that when the winding roll 4 and the nip roll 5 were pressed against each other, air was blown only from the region A at the end point of winding the metal plate immediately after the pressed portion.

[0086] After preheating the metal plate 1 in this manner,
At the interface between the metal plate 1 and the nip roll 5, P
The ET-based resin 3 was extruded and allowed to flow down to cover the metal plate 1. At this time, the PET-based resin 3 was coated on both sides of the metal plate 1 by a width of 50 mm.

Immediately after the start of coating the metal plate 1 with the PET resin 3, air was blown out from the through-hole of the winding roll 4.
Peeling without winding around, line speed 20m / m
It was confirmed that the operation could be performed stably until “in”.

Further, air was blown to the surface of the overcoated resin after the pressure welding using an air nozzle until the winding of the metal plate was completed.

Air was sprayed on the surface of the winding roll where the resin was to be overcoated with an air nozzle, and the surface of an internal water-cooled cooling roll having an outer diameter of 50 mm was contacted to cool the winding roll surface. .

The overcoat resin did not stick to the winding roll, and could operate stably even at a high speed of 100 m / min.

As a comparative example, in the above embodiment, when the operation was performed without using the roll that blows out the air, the resin that protruded from the metal plate was immediately wound around the roll around which the metal plate was wound, and the operation became impossible. Was.

[0092]

According to the present invention, a laminated metal plate excellent in adhesion, workability, corrosion resistance and appearance can be manufactured with good yield.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a method of coating by flowing a molten resin onto an interface between a metal substrate and a roll.

FIG. 2 is an explanatory diagram of a T-die extrusion method using a soft thin material.

FIG. 3 is an explanatory view of the method of the present invention.

FIG. 4 is a sectional view taken along line XX in FIG. 3;

FIG. 5 is a sectional view taken along line YY in FIG. 3;

FIG. 6 is a sectional view taken along the line ZZ in FIG. 3;

FIG. 7 is an enlarged view of a hole in FIG. 6;

8 is a sectional view taken along the line UU in FIG. 7 (two-step hole type).

FIG. 9 is a sectional view taken along the line UU in FIG. 7 (taper type).

FIG. 10 is a cross-sectional view of a nip roll press-contact portion having a hole diameter larger than a nip width.

FIG. 11 is a cross-sectional view of a nip roll press-contact portion having a hole diameter smaller than a nip width.

FIG. 12 is an explanatory view showing an embodiment of gas injection.

FIG. 13 is an explanatory view showing an embodiment of gas injection.

FIG. 14 is an explanatory diagram of the first embodiment.

FIG. 15 is an explanatory view of the present invention using both cooling and gas injection.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal plate 2 T die 3 Thermoplastic resin 4 Winding roll 5 Compression roll 6 Cooling device 7 Water spray cooling device 8 Soft thin material 9 Wind box 10 Through hole 51 Metal sleeve 52 Rubber lining 53 Moving part 54 Shaft 55 Outer tube (Sleeve) 56 Socket 57 Plug 58 Spring 59 Bearing 61 Gas supply pipe 63 Slot 11 Cooling nozzle 12 Cooling roll

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Haruhisa Sugimoto 1 Fujimachi, Hirohata-ku, Himeji-shi Nippon Steel Corporation Hirohata Works (56) References JP-A-52-32053 (JP, A) JP-A-57-43816 (JP, A) JP-A-61-199926 (JP, A) JP-A-52-153747 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 65 / 00-65/82 B32B 1/00-35/00

Claims (4)

(57) [Claims] 1. A pressing roll is pressed against a preheated metal plate wound around a winding roll, and a thermoplastic resin film melted from a T-die through an extruder is placed in a gap between the pressing roll and the metal plate. In the method of manufacturing a laminated metal sheet by coating a metal sheet with a thermoplastic resin by flowing down, the width of the thermoplastic resin film flowing down into the gap between the pressure roll and the metal plate is set to be larger than the width of the metal plate. The resin was overcoated to cover the entire width of the metal plate with the central portion in the width direction of the thermoplastic resin film and to prevent the thermoplastic resin film flowing down larger than the width of the metal plate from adhering to the winding roll. The resin film is peeled off from the winding roll by injecting gas from a hole opened on the surface of the winding roll of the part, and a cooling medium is sprayed on the surface of the thermoplastic resin film of the resin overcoated part to cool. Do And a method for producing a laminated metal plate. 2. A pressing roll is pressed against a preheated metal plate wound around a winding roll, and a thermoplastic resin film melted from a T-die via an extruder is placed in a gap between the pressing roll and the metal plate. In the method of manufacturing a laminated metal sheet by coating a metal sheet with a thermoplastic resin by flowing down, the width of the thermoplastic resin film flowing down into the gap between the pressure roll and the metal plate is set to be larger than the width of the metal plate. The resin was overcoated to cover the entire width of the metal plate with the central portion in the width direction of the thermoplastic resin film and to prevent the thermoplastic resin film flowing down larger than the width of the metal plate from adhering to the winding roll. The resin film is peeled from the winding roll by injecting gas from a hole opened on the surface of the winding roll of the portion, and a cooling roll is pressed against the surface of the thermoplastic resin film of the portion where the resin is overcoated and cooled. Do A method for producing a laminated metal plate, characterized in that: 3. A pressing roll is pressed against a preheated metal plate wound around a winding roll, and a thermoplastic resin film melted from a T-die through an extruder is placed in a gap between the pressing roll and the metal plate. In the method of manufacturing a laminated metal sheet by coating a metal sheet with a thermoplastic resin by flowing down, the width of the thermoplastic resin film flowing down into the gap between the pressure roll and the metal plate is set to be larger than the width of the metal plate. The resin was overcoated to cover the entire width of the metal plate with the central portion in the width direction of the thermoplastic resin film and to prevent the thermoplastic resin film flowing down larger than the width of the metal plate from adhering to the winding roll. The resin film is peeled off from the winding roll by injecting gas from a hole opened on the surface of the winding roll of the portion, and both ends in the width direction of the winding roll where the resin is overcoated are pressed against the cooling roll. Or And / or a method of manufacturing a laminated metal sheet, which comprises previously cooling by spraying a cooling medium. 4. A pressing roll is pressed against a preheated metal plate wound around a winding roll, and a thermoplastic resin film melted from a T-die through an extruder through a gap between the pressing roll and the metal plate flows down. In the method of manufacturing a laminated metal plate by coating the metal plate with a thermoplastic resin, the width of the thermoplastic resin film flowing down into the gap between the pressure roll and the metal plate is made larger than the width of the metal plate, the thermoplastic resin The portion where the resin is overcoated in order to cover the entire width of the metal plate with the widthwise central portion of the resin film and to prevent the thermoplastic resin film flowing down larger than the width of the metal plate from adhering to the winding roll. A gas is injected from a hole opened in the surface of the winding roll to separate the resin film from the winding roll, and a cooling roll is pressed against both ends in the width direction of the winding roll where the resin is to be overcoated. Do it again Is characterized by spraying a cooling medium and cooling in advance, and pressing a cooling roll against the surface of the thermoplastic resin film in a portion where the resin is overcoated and or cooling by spraying a cooling medium. Of manufacturing a laminated metal plate.