JPH09300532A - Thermoplastic resin coated metal sheet excellent in molding processability, and method and apparatus for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermoplastic resin coated metal sheet improved in draw processability, enabling the reduction of the thickness of the body part of a drawing can and the rising of the height thereof, suppressing the generation of a lug at a time of draw processing and reducing the thickness fluctuations of the body part of the can. SOLUTION: A continuously advancing strip like metal sheet 4 is heated and a thermoplastic resin film 7 having orientation properties in both surfaces thereof is bonded to the heated metal sheet under pressure by a pair of laminating rolls 8 to be laminated thereto and the laminated metal sheet is sent into the gap between at least a pair of rolls consisting of the surface roughened roll 10 and backup roll 11 of which the surface is composed of an elastic member provided under the rolls 8 and surface roughening processing is applied to the surface of the laminated resin film in a predetermined pattern to form predetermined surface roughness on the surface of the resin film and, thereafter, the resin laminated metal sheet is immediately cooled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermoplastic polyester resin-coated metal sheet (hereinafter referred to as a resin-coated metal sheet) having excellent moldability, a method for producing the same and an apparatus for producing the same.
More specifically, after laminating a thermoplastic resin film on a metal plate by a known method, one of which has been subjected to surface roughening processing in a predetermined pattern on the surface (hereinafter referred to as roughening roll),
The other surface is a backup roll composed of an elastic member (hereinafter referred to as a backup roll) and is fed between at least a pair of rolls to roughen the surface of the thermoplastic resin film, thereby forming a laminated thermoplastic resin film, TECHNICAL FIELD The present invention relates to a resin-coated metal plate excellent in molding processability, which is provided with a predetermined average surface roughness, a manufacturing method and a manufacturing apparatus thereof.

[0002]

2. Description of the Related Art In recent years, materials in which biaxially oriented polyester resin films (hereinafter abbreviated as resin films) are laminated on both sides of a metal plate have been subjected to severe forming processing such as drawing cans and thin drawing deep drawing cans. It has become widely used as a material for cans. When such a severe forming process is performed, when the laminated resin films have a high degree of biaxial orientation, the resin films peel off or cracks occur in the resin films. That is, it is necessary to considerably reduce the degree of biaxial orientation of the laminated resin films. However, if the degree of biaxial orientation of the laminated resin film is lowered too much, the resin film may be adhered to the can making tool during the molding process, resulting in a marked deterioration of the continuous can making property. Furthermore, the decrease in the degree of biaxial orientation of the resin film laminated on the inner surface of the can decreases the barrier property against the contents to be filled and also reduces the impact processability, which may be caused by a slight impact applied from the outside. Cracks occur in the laminated resin layers, the metal plate comes into direct contact with the contents, and the corrosion resistance is significantly reduced. Further, when the laminated resin film has a high degree of biaxial orientation, the impact workability is excellent, but the work adhesion to the metal plate is poor, and there is a problem that the resin film is easily peeled off by the molding process. . Therefore, the resin-coated metal sheet used as a material for a can that is subjected to severe forming processing satisfies the characteristics required for the inner and outer surfaces of the can. The degree of biaxial orientation is reduced to the extent that does not impair the property, and the resin film laminated on the surface that becomes the inner surface of the can does not impair processing adhesion and does not reduce corrosion resistance and impact workability.
The resin composition of the resin film to be used, the degree of biaxial orientation, and the laminating conditions of the resin film are determined in consideration of remaining biaxial orientation.

Further, the metal plate used as the substrate of the above resin-coated metal plate generally has anisotropy. If this anisotropy is large, the plastic flow of the material due to plastic working is not uniform. , The edge height of the can body, which is formed by integrally forming the can bottom and the body of the can, such as drawing and thinning deep-drawing, becomes uneven, and so-called “ears” and wrinkles with higher edge height than other parts occur. However, when the ears are cut off to obtain a uniform can height, the amount of cutting is increased, the thickness required for the can body becomes insufficient, or when the obtained can body is pulled out from the punch. It may cause the disconnection to be defective. In addition, the plate thickness distribution in the circumferential direction of the can body wall becomes non-uniform. Therefore, when performing neck-in processing or flange processing on the upper part of the obtained can body, it may cause cracks or cause winding failure when winding the can lid, which hinders efficient continuous can manufacturing. ing.
Therefore, as the substrate of the conventional resin-coated metal plate, a metal plate with small anisotropy is desired, and for example, steel components and hot rolling conditions, cold rolling conditions, annealing conditions, tempered rolling conditions, and other limited manufacturing conditions. A method using the manufactured cold rolled steel sheet (Japanese Patent Laid-Open No. 1-306527) has been proposed, but it cannot be said that the above-mentioned problems in forming processing have been completely solved. Recently, from the standpoint of cost reduction of cans, it has been desired to reduce the weight of the cans.Thus, after deep-drawing the resin-coated metal sheet, stretching it, and then ironing it, the can body wall can be made thinner and obtained. It has been studied to reduce the weight of cans that can be used, and the resin-coated metal sheet used is required to have better moldability, corrosion resistance, and impact workability than conventional resin-coated metal sheets. became. For such a more severe molding process, it is desirable to use a metal plate with smaller anisotropy as the substrate of the resin-coated metal plate, but at present, there is no metal plate that is satisfactory in terms of characteristics and economically. Not obtained. Further, by lowering the degree of biaxial orientation of the resin film laminated on the metal plate to some extent, the laminated resin film can be sufficiently molded without peeling, but the corrosion resistance and corrosion resistance required for the inner surface of the can can be improved. Impact workability cannot be satisfied at the same time. That is, at present, a resin-coated metal plate suitable for a can, which has been deep-drawn, stretched, and then ironed, has not been obtained.

[0004]

The first problem to be solved by the present invention is to improve the drawability of a conventional resin-coated metal plate, reduce the plate thickness of the can body wall, and at the same time increase the can height. The second problem is to improve the drawing workability, improve the anisotropy of the resin-coated metal plate, reduce the ear height generated by the drawing work, and reduce the can height. Neck-in processing, flange processing, and can lid wrapping of the upper part of the can body obtained by reducing the plate thickness fluctuation of the body wall, drawing, deep drawing, stretching, and ironing. Another object of the present invention is to provide a resin film-covered metal plate in which the occurrence of defects is reduced, and further to provide its manufacturing method and manufacturing apparatus.

[0005]

The thermoplastic resin-coated metal plate of the present invention is a metal plate having at least one surface coated with a thermoplastic resin film, and is composed of a portion having a large stretch rate and a portion having a small stretch rate in the molding process. , The surface roughness of the film surface is made different. Such a coated metal plate is a metal plate in which both surfaces of the metal plate are coated with a thermoplastic resin film with or without a thermosetting resin adhesive, and the metal plate is laminated on at least one surface of the metal plate. The maximum surface roughness Rmax of the thermoplastic resin film is 5μ
m or less, and the average surface roughness of the thermoplastic resin film laminated on the portion that will be the can body wall when the thermoplastic resin film-coated metal plate is processed is Ra (W), the portion that will be the can bottom. When Ra (B) is the average surface roughness of the thermoplastic resin film laminated on
˜3.0 μm, and Ra (W) ≧ Ra (B) is desirable. In addition, the maximum surface roughness Rmax of the thermoplastic resin film laminated on at least one surface of the metal plate
Is 5 μm or less, and is a portion that becomes a can body wall when the thermoplastic resin film-coated metal plate is formed and processed,
In addition, the average surface roughness of the thermoplastic resin film laminated at a portion which becomes a valley which is an intermediate portion between the ears and which is caused by the anisotropy of the metal plate by the molding process is Ra (V), Ra (M) is the average surface roughness of the thermoplastic resin film laminated on the canned portion, and Ra (B) is the average surface roughness of the thermoplastic resin film laminated on the canned portion.
And Ra (V) is 0.1 to 3.0 μm, and R
It is characterized in that a (V) ≧ Ra (M) ≧ Ra (B). Such a thermoplastic resin film is preferably a film made of any one of a polyethylene terephthalate, polybutylene terephthalate, a copolymerized polyester resin mainly containing a repeating unit of ethylene terephthalate and a polyester resin mainly containing a repeating unit of butylene terephthalate. Further, a feature of the present invention is a thermoplastic resin-coated metal plate which is a film made of a polyester resin blended with at least two kinds of resins described above, or a multilayer film formed by laminating at least two kinds of polyester resins described above. In addition, the thermoplastic resin film is a film made of a composite resin obtained by blending the above polyester resin with a bisphenol A polycarbonate resin, or the above polyester resin as an upper layer and a lower layer, and the above bisphenol A polycarbonate resin is added to the above polyester resin. A thermoplastic resin-coated metal plate which is a blended composite resin or a multilayer film having the bisphenol A polycarbonate resin as an intermediate layer, and further, the thermoplastic resin film is biaxially stretched after film formation by a known method. Processing A biaxially oriented films is a thermoplastic resin coated metal sheet. Further, the present invention heats a continuously progressing strip-shaped metal plate, abuts a thermoplastic resin film on both surfaces thereof, and forms the metal plate with a pair of laminating rolls arranged so as to sandwich both surfaces of the metal plate. After pressure-bonding the thermoplastic resin film and the thermoplastic resin film, the metal plate coated with the thermoplastic resin film is held at a temperature equal to or higher than the softening point of the thermoplastic resin film, and is opposed to the lower side of the laminating roll. Arranged,
One roll is subjected to a surface roughening process in a predetermined pattern, and the other is fed between at least a pair of rolls consisting of a backup roll whose surface is made of an elastic member,
The surface of the laminated thermoplastic resin film is subjected to a surface roughening treatment, the thermoplastic resin film surface is allowed to form a predetermined average surface roughness, and then immediately cooled to fix the formed average surface roughness. It is a method for producing the above thermoplastic resin-coated metal plate, characterized in that after laminating the thermoplastic resin film on the metal plate, the metal plate coated with the thermoplastic resin film, the The method for producing a thermoplastic resin-coated metal sheet is characterized in that the thermoplastic resin-coated metal sheet is held by a roll having a roughened surface and the backup roll with a nip length of 3 mm or more. Still further, the manufacturing apparatus of the present invention comprises means for heating a continuously progressing strip-shaped metal plate, means for supplying a thermoplastic resin film provided below the metal plate in the traveling direction, and further below the means. A pair of laminating rolls provided with the thermoplastic resin film abutting on both sides of the metal plate, sandwiching both from the left and right, and pressure-bonded, and further provided below the laminating rolls, one of which has a rough surface From at least a pair of rolls each of which has been subjected to chemical processing, and the other surface is a backup roll having a surface made of an elastic member, and cooling means provided below the rolls for cooling the thermoplastic resin film-coated metal plate. It is characterized by

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION A continuously advancing strip-shaped metal plate is heated, and a thermoplastic resin film is laminated on both surfaces thereof, and then the resin-coated metal plate is kept at a temperature equal to or higher than the softening point of the resin film. When they are placed facing each other, they are fed between at least a pair of roughening rolls and backup rolls, and then cooled to form a predetermined average surface roughness on the surface of the laminated resin films. It is possible to obtain a thermoplastic resin-coated metal plate which is excellent in moldability and which can be subjected to severe molding such as stretch processing and ironing processing.

Generally, when a resin-coated metal plate is subjected to deep drawing, the metal plate as a substrate has anisotropy depending on its chemical composition and manufacturing conditions, and the edge height of the obtained cup is not uniform. Becomes So-called "ears" occur in any of the following parts. (1) A total of four ears are generated mainly in the 45 ° and 135 ° directions with respect to the rolling direction, and the middle of them has a dented state, that is, the part becomes a valley. (2) A total of four ears are generated mainly in a direction perpendicular to the rolling direction and in a direction parallel to the rolling direction, and a middle portion thereof forms a valley. (3) A total of 6 ears are generated mainly in the 0 ° direction, 60 ° direction and 120 ° direction with respect to the rolling direction, and the middle part thereof forms a valley.

Since the troughs between the ears are deformed in the plate thickness direction from the part where the ears are generated by the molding process, the plate thickness of the can body wall of the obtained can is higher than that of the other parts (ears). The thickness becomes thicker, and as a result, the plate thickness distribution in the circumferential direction of the can body wall becomes uneven. 1 (a) and 1 (b) are schematic views of the resin-coated metal plate of the present invention. In FIG.
Reference numeral a represents a portion that becomes a can body wall by molding, 1b represents a portion that becomes scrap during molding, and 3 represents a portion that becomes a can bottom by molding. In addition, FIG. 1 (b) shows a substrate of resin films to be laminated, which is formed by molding to form 45
This is an example of using a metal plate with four ears generated mainly in the ° and 135 ° directions. 2a is the part that becomes the can body wall by molding, and 2b is the same as the ears. Although it is the part that becomes the can body wall, it represents the part that becomes the valley that is the middle part between the ears.

In the resin-coated metal sheet of the present invention, the portions of the laminated resin film shown by 1a and 2b in FIGS. 1 (a) and 1 (b) are roughened. In the resin-coated metal sheet of the present invention shown in FIGS. 1 (a) and 1 (b), the surface of the resin film laminated on the portion 3 that becomes the can bottom and the portion 1b that becomes scrap during blanking during can manufacturing. Is a portion that does not affect the molding workability even if it is roughened like 1a and 2b, and does not cause any trouble, but if the portion that becomes the bottom of the outer surface of the can is roughened,
This may result in a slight change in appearance, and roughening the bottom of the can inner surface will not improve the characteristics, but rather may adversely affect the corrosion resistance and impact workability of the can inner surface. It is necessary to be careful to roughen the area. The part indicated by 1b is a part to be scrapped at the time of forming, and is the circular part indicated by 1a or 2
It is preferable from the viewpoint of the yield at the time of can making that the circular portions indicated by b are arranged close to each other and the portion indicated by 1b is made as small as possible.

The resin-coated metal sheet shown in FIG. 1 (a) has improved processability and the plate thickness of the can body wall can be reduced by increasing the can height of the obtained can body. There is no effect in suppressing the occurrence of ears due to the anisotropy of the resin-coated metal plate during processing, and making the plate thickness distribution of the can body wall of the can body uniform.
However, it is effective to reduce the plate thickness of the can body wall and to increase the can height, which is an effective measure for reducing the cost of the can. Further, the resin-coated metal plate shown in FIG. 1 (b) has improved moldability, the anisotropy of the resin-coated metal plate is improved, and the can height of the obtained can body is increased. This is an example of a more preferable embodiment of the present invention, which has a small ear and is easy to make the plate thickness distribution of the can body wall of the obtained can body uniform.

In the resin-coated metal sheet of the present invention, the reason why the moldability is improved by roughening the laminated resin film is not clear, but the friction coefficient with the punch is appropriately maintained during the molding process. It is thought that this is also a factor. Further, by roughening the surface of the resin film laminated in the valley portion by the molding process, the anisotropy of the resin-coated metal plate is improved, and the plate thickness fluctuation of the can body wall of the obtained can body is small. Although the cause of this is not well understood, it is considered that the deformation of the trough in the plate thickness direction is suppressed.

In the above description, it was noted that it is necessary to roughen only a predetermined portion of the resin film laminated on the metal plate from the viewpoint of moldability of the resin-coated metal plate. The surface roughness of the formed resin film will be described. The resin layer laminated on at least one side of the resin-coated metal sheet of the present invention has a maximum surface roughness Rmax of 5.0 μm or less on the free surface (surface layer) which is not in contact with the metal sheet, and becomes a can body wall by drawing. Ra (W), or the average surface roughness of the resin film surface laminated on the part that becomes the can body wall by the drawing process and the ears that are generated by the drawing process. Ra (M), the average surface roughness of the resin film surface laminated in the middle of the ears, the so-called valley portion
When Ra (V) and the average surface roughness of the resin film surface laminated on the bottom part of the can are Ra (B), R
a (W) or Ra (V) is 0.1 to 3.0 μm, more preferably 0.3 to 1.0 μm, and R
a (W) ≧ Ra (B) or Ra (V) ≧ Ra (M)
It is necessary to roughen the surface of the resin film laminated on the metal plate so that ≧ Ra (B). It is possible to predict in advance which part of such a part will correspond to which part when the blank is punched out from the resin-coated steel sheet. Further, by roughening the resin film laminated in a predetermined portion in this way, even when the biaxial orientation degree of the laminated resin film is decreased from the conventional level on the surface which becomes the outer surface of the can at the time of can making. No adhesion with the can-making tool of
On the inner surface of the can, even if the degree of biaxial orientation of the resin film is higher than before, the laminated resin film does not peel off due to the molding process, and the corrosion resistance and impact resistance to the contents to be filled are high. Can be satisfied.

In the resin-coated metal sheet of the present invention, it is preferable to give the above-mentioned surface roughness to both surfaces of the resin-coated metal sheet from the viewpoint of moldability, but especially the above-mentioned surface roughness is given to the outer surface of the can. Is more practically preferable. Even if the above-mentioned surface roughness is applied to the inner surface of the can, there is no particular problem. However, the inner surface of the can requires not only moldability but also corrosion resistance and impact resistance. Therefore, it is necessary to roughen the laminated resin layer so that deep recesses do not occur. From this viewpoint, the maximum surface roughness Rmax of the resin layer laminated on the inner surface of the can is 5.0 μm or less. Preferably.

In the resin-coated metal plate of the present invention, when the surface roughness of the resin film laminated on the can body is smaller than the surface roughness of the resin film laminated on the can bottom, the moldability is improved, that is, the can body is improved. It has no effect on reducing the wall thickness and increasing the height of the can, and the surface roughness of the resin film surface laminated on the part that becomes the can body wall and the part that becomes the ears generated by drawing process When the surface roughness of the resin film surface laminated in the middle part of the ear and the so-called valley is smaller than the anisotropy of the resin-coated metal plate,
Ra (W) ≧ Ra (B), or Ra (V) ≧, because the ear generated by the drawing process cannot be reduced.
It is limited to Ra (M) ≧ Ra (B). Ra
(W) and Ra (V) are limited to 0.1 to 3.0 μm, but Ra
If (W) and Ra (V) are less than 0.1 μm, there is no effect in improving the moldability, that is, reducing the plate thickness of the can body wall and increasing the can height, while Ra (W), Ra ( V)
If it exceeds 3.0 μm, the friction coefficient of the surface becomes too large,
The body of the can may break during molding. In addition, the high temperature volatile lubricant that acts as a lubricant during the molding process that is applied to the roughened resin-coated metal plate does not volatilize sufficiently due to the heating applied to the can body after the molding process and remains on the surface of the can body. May occur, causing a problem in the characteristics of the can. Therefore, from this viewpoint as well, Rmax of the resin layers to be laminated is preferably limited to 5.0 μm or less.

The surface of the thermoplastic resin film laminated on the metal plate is roughened to the above-described suitable roughness as follows. That is, after laminating a thermoplastic resin film on a strip-shaped metal plate, it is held at a temperature equal to or higher than the softening point of the resin film and fed between at least a pair of roughening rolls and backup rolls which are arranged facing each other. As a result, the rough surface pattern of the roughening roll is transferred to the thermoplastic resin film, and a predetermined average surface roughness is formed on the surface of the laminated resin films. Roughening roll thermoplasticity works to form a certain surface roughness on the surface of the resin film on which the resin-coated metal plate is laminated.Made of metal is desirable, and the roll surface is mechanically polished, chemically corroded, and discharged. What is processed or processed into a predetermined pattern by a known method such as laser light irradiation is used. The average surface roughness of the surface of the roughening roll needs to be processed to be slightly rougher than the average surface roughness formed on the surface of the laminated resin film, and the average surface roughness Ra (W) is formed on the surface of the resin layer. , Ra (V)
The average surface roughness of the portion that forms the film is about 0.5 to 5.0 μm, and the portion that gives the average surface roughness Ra (M) is Ra (V).
Is about the same as or slightly smaller than the average surface roughness of the portion giving the average surface roughness Ra (B).
It is necessary to make it about the same as or slightly smaller than the average surface roughness of the part that gives (W) and Ra (M). Also,
The maximum surface roughness of the surface of this roughening roll is preferably as small as possible, but it is preferably processed to about 7.0 μm or less at the maximum. The above softening temperature means a thermomechanical analyzer (TMA100, Seiko Electronic Co., Ltd.).
Manufactured by K.K.) is used to increase the temperature of the thermoplastic resin film at a temperature increase rate of 10 ° C./min, and the temperature at which the needle starts entering the thermoplastic resin film. Further, the surface of the resin film laminated in the resin-coated metal plate of the present invention, and the average surface roughness and maximum surface roughness of the roughening roll used in the production of the resin-coated metal plate of the present invention, two-dimensional surface roughness It can be measured by using a known method such as a densitometer or a three-dimensional surface roughness meter.

A thermoplastic resin film having the same average surface roughness and maximum surface roughness as the thermoplastic resin-coated metal plate of the present invention, that is, a so-called pre-roughened resin film is laminated on the metal plate, and then the features of the present invention. It is possible to obtain a similar resin-coated metal plate to the resin-coated metal plate of the present invention without performing embossing which is, but the resin-coated metal plate obtained by such a method was laminated. The adhesion between the resin film and the surface of the metal plate is poor, and the laminated resin layers are easily peeled off when subjected to severe molding. That is, it is preferable that the surface of the resin film that is in contact with the metal plate is as smooth as possible from the viewpoint of adhesion to the metal plate. Therefore, only the surface of the laminated resin film that is in contact with the metal plate is smooth, and it is conceivable to laminate a resin film having a roughened resin film surface that is not in contact with the metal plate on the metal plate,
Such a resin film having different average surface roughness from the front and back also has a bad shape, and it is difficult to continuously laminate it on a metal plate at a high speed, and a treatment for roughening the resin film after molding is required, which is economically economical. Is also not preferable.

Next, in the resin-coated metal plate of the present invention,
The thermoplastic resin film to be laminated may be one or more copolymer resins of polyethylene resin, polypropylene resin, polyester resin, polycarbonate resin, polyvinyl chloride resin, polyvinylidene chloride resin, acrylic resin, or two or more kinds. An example is a film made of a composite resin obtained by blending resins. These thermoplastic resin films have different characteristics such as heat resistance, corrosion resistance, workability, and adhesiveness, and should be selected according to the purpose. Especially for applications that require severe moldability such as cans that are deep drawn, stretched, and ironed, polyester resin film, especially polyethylene terephthalate, polybutylene terephthalate, ethylene terephthalate repeat Copolymerized polyester resin mainly composed of units, polyester resin mainly composed of butylene terephthalate repeating units,
Alternatively, it is preferable to use a film made of any one of polyester resins obtained by blending at least two kinds of these, or a multi-layer polyester resin film formed by laminating at least two kinds of these resins. In this case, a film made of a resin obtained by blending the above polyester resin with a bisphenol A polycarbonate resin, or a composite resin obtained by blending the above polyester resin with a bisphenol A polycarbonate resin as an upper layer and a lower layer, or A multilayer resin film having a bisphenol A polycarbonate resin as an intermediate layer is preferable. Further, from the viewpoints of corrosion resistance and impact resistance, these resin films are preferably biaxially oriented films formed by known methods and then stretched in two directions.

Further, when the processing adhesion of these thermoplastic resin films to the metal plate is not sufficient, or when these thermoplastic resin films alone are laminated, sufficient corrosion resistance,
When impact resistance cannot be ensured, a thermosetting adhesive such as a phenol / epoxy adhesive is applied to the surface of a metal plate and dried, and then a thermoplastic resin is laminated or a thermoplastic resin film is laminated. It is necessary to previously apply a thermosetting adhesive to the surface of the metal plate to be bonded to the metal plate and dry it. However, this method of interposing an adhesive increases the cost and requires a countermeasure against environmental pollution due to the organic solvent in the adhesive used, and it is not preferable to apply it unless it is unavoidable.

Next, the thickness of the thermoplastic resin film to be laminated should also be determined in consideration of the required characteristics, but in general, the range of 10 to 50 μm is preferable, and the thickness of 15 to 30 μm is preferable.
Is more preferable. When the thickness of the resin film is 10 μm or less, it is difficult to continuously laminate the resin film on the metal plate at a high speed, and moreover, sufficient working corrosion resistance cannot be obtained. Further, the application of a resin film having a thickness of 50 μm or more is not economical as compared with the commonly used paint for cans. Further, if necessary, an appropriate amount of an additive such as a stabilizer, an antioxidant, an antistatic agent, a pigment, a lubricant, or a corrosion inhibitor may be added to these thermoplastic resins without any problem. Particularly, it is preferable to add a titanium oxide-based white pigment to the thermoplastic resin laminated on the outer surface of the can in consideration of the clarity of the print design.

Next, for the resin-coated metal plate of the present invention, a steel plate or an aluminum alloy plate subjected to a band-shaped surface treatment is used. When using a steel plate as a substrate of the resin-coated metal plate of the present invention, if the steel plate can be severely formed, there is no particular limitation on the components in the steel, etc., but the plate thickness generally used for cans is 0.15 A low carbon cold-rolled steel sheet of ~ 0.30 mm is preferable, and a steel sheet having a chromium hydrate oxide film on the surface thereof, in particular, a lower layer is metallic chromium, and an upper layer is, in order to ensure excellent processing adhesion with a resin film to be laminated. A steel sheet having a two-layer structure film of chromium hydrate oxide, so-called tin-free steel (TFS), is more preferable, and one or two of tin, nickel, aluminum or the like is further provided on the steel sheet surface.
It is also possible to apply a steel sheet which has been subjected to multi-layer plating or alloy plating of at least one kind and has the above-mentioned two-layer structure film formed thereon. Also, when using an aluminum alloy plate as the substrate of the resin-coated metal plate of the present invention, it is not particularly limited as long as it is an aluminum alloy plate that can be severely formed, but in terms of cost and formability, it can be used for a can. Plate thickness that is used frequently 0.20
A JIS 3000 series or 5000 series aluminum alloy plate of ~ 0.35 mm is preferable. However, even when these aluminum alloy plates are used as the substrate of the resin-coated metal plate of the present invention, the surface is formed by a known method such as electrolytic chromic acid treatment, immersion chromic acid treatment, alkaline solution, acid solution etching treatment, and anodizing treatment. Treatment is necessary to ensure excellent processing adhesion of the laminated thermoplastic resin layer. In particular, when forming the above two-layer coating on a steel plate or an aluminum alloy plate, the amount of chromium hydrate oxide is 3 to 25 mg / m ² in terms of processing adhesion of the resin film to be laminated as chromium. The range of 7 to 20 mg / m ² is more preferable.
Further, the amount of metal chromium is not particularly limited, but the corrosion resistance after processing, the range of 10 to 200 mg / m ² is preferable from the viewpoint of the processing adhesion of the resin film to be laminated, and the range of 30 to 100 mg / m ² . Is more preferable.

Next, a method for producing the thermoplastic resin-coated metal plate of the present invention will be described. First, a continuously advancing strip-shaped metal plate is heated, and thermoplastic resin films having orientation are laminated on both surfaces thereof by a known film laminating method. Although it is possible to laminate a thermoplastic resin on a metal plate by the molten resin extrusion lamination method, in the case of the molten resin extrusion lamination method, the resin layer to be laminated is in a non-oriented state, and depending on the thermoplastic resin used, it may be molded. It may be difficult to satisfy all of the workability, corrosion resistance, and impact workability, and since it is difficult to stack at high speed,
This lamination method should be used in consideration of the intended use of the resulting resin-coated metal sheet. Further, in the film laminating method, unstretched, uniaxially stretched or biaxially stretched films can be laminated on a metal plate at a high speed, but the obtained resin-coated metal plate has good formability, corrosion resistance and corrosion resistance. Considering impact processability, a film is formed by a known method, then stretched biaxially in the longitudinal and transverse directions, and a heat-fixed biaxially oriented resin film is laminated on a metal plate by heat fusion, and laminated on the surface which becomes the outer surface of the can. The degree of biaxial orientation of the resin film
More preferably, the resin film is laminated under the condition that the degree of biaxial orientation of the resin film laminated on the inner surface of the can remains relatively.

Next, the method and apparatus for manufacturing the thermoplastic resin-coated metal sheet of the present invention will be described in detail with reference to the drawings. FIG. 2 is a diagram showing an example of a schematic configuration of an apparatus used for producing the thermoplastic resin-coated metal plate of the present invention. In the apparatus for manufacturing a resin-coated metal plate of the present invention shown in FIG. 2, reference numeral 5 is a heating means for continuously heating the continuously advancing strip-shaped metal plate 4, and below the heating temperature. A final heating roll 6 for finally controlling the temperature is provided. Below these heating means, a pair of laminating rolls 8 for pressurizing and thermally adhering the thermoplastic resin film 7 to both surfaces of the heated metal plate 4 are provided. At least a pair of roughening rolls 10 and backup rolls 11 for forming a predetermined surface roughness on the surface of the resin film laminated with the thermoplastic resin-coated metal plate 9 at a position slightly below the laminating roll. Is provided. Below that, a quench tank 1 for cooling the thermoplastic resin-coated metal plate 12 having a predetermined surface roughness formed on the surface of the resin film by the roughening process to room temperature.
3 are provided. Below that, means 14 for winding the roughened thermoplastic resin-coated metal plate 12 into a coil shape
Is provided.

As the heating means 5, a known one such as a high frequency heating furnace is used. Further, other heating means such as a heating roll and an induction heating coil can be applied. Further, the pair of laminating rolls 8 has the metal plate 4 passing therethrough.
Also, it functions as a nip roll for pinching the thermoplastic resin film 7 inserted therebetween, and a known one is used. Normally, it is possible to rotate both the laminating rolls 8 in synchronism with each other so that the thermoplastic resin-coated metal sheet 9 is fed downward, and the gap between the laminating rolls and the rotational speed can be adjusted. There is. The roughening roll 10 roughens the thermoplastic resin-coated metal plate 9 that passes between the roughening roll 10 and the backup roll 11 arranged to face it, and forms a predetermined surface roughness on the surface of the laminated resin films. It is desirable that it is made of metal, and the roll surface is mechanically polished, chemically corroded, electric discharge machined,
Alternatively, a roughened surface is formed into a predetermined pattern by a known method such as irradiation with laser light. The average surface roughness of the surface of the roughening roll needs to be processed to be somewhat rougher than the average surface roughness formed on the surface of the laminated resin film, and the average surface roughness Ra on the surface of the resin layer is required.
(W) and Ra (V) are formed in an average surface roughness of about 0.5 to 5.0 μm, and a portion giving an average surface roughness Ra (M) is the same as an average surface roughness of a portion giving Ra (V). Average surface roughness Ra
The portion giving (B) is Ra (W) or Ra (M)
It is necessary to make the surface roughness approximately equal to or slightly smaller than the average surface roughness of the portion that gives The maximum surface roughness of the surface of the roughening roll is preferably as small as possible, but it is preferably processed to about 7.0 μm or less at the maximum. On the other hand, as the backup roll 11, a roll whose surface is covered with rubber as an elastic member is used. This backup roll 11 can be rotationally driven so as to feed the roughened thermoplastic resin-coated metal plate 12 downward while synchronizing with the roughening roll 10 like the laminating roll 8. Furthermore, the gap between both rolls and the rotation speed can be adjusted. Although not shown, the roughened thermoplastic resin-coated metal plate 12 drawn out from the quench tank 13 is provided on the lower side by another nip roll provided between the metal plate 12 and the coiling means 14. Since it is driven toward, the appropriate tension is applied to the thermoplastic resin-coated metal plate 9.

The apparatus for producing a thermoplastic resin-coated metal plate of the present invention constructed as described above is used as follows. First, a resin fed from a resin film supply means (not shown) to both surfaces of a strip-shaped metal plate 4 which is gradually heated by a plurality of heating means 5 and then heated to a predetermined temperature by a pair of final heating rolls 6. The film 7 is superposed between the pair of laminating rolls 8 and pressure-bonded. Then, the thermoplastic resin-coated metal plate 9 thus obtained is fed between at least a pair of roughening rolls 10 and backup rolls 11 provided below the roughened rolls, and the surface of the laminated resin film is roughened. The roughened thermoplastic resin-coated metal plate 12 is sent downward, guided into the quench tank 13, cooled, dried by a drying means (not shown), and then coiled by a coiling means 14. Being rolled up. In order to form a predetermined average surface roughness on the surface of the laminated resin film by subjecting the thermoplastic resin-coated metal plate 9 to surface roughening, the temperature of the thermoplastic resin-coated metal plate 9 is set to the laminated thermoplastic film. While maintaining the temperature above the softening point of the resin film, preferably about 10 to 20 ° C higher than the softening point, apply a pressure of 2 to 10 kg per 1 cm of roll length between the roughening roll 10 and the backup roll 11. In addition, FIG.
As shown in, it is necessary to make the surface of the backup roll 11 crushed by the roughening roll 10 and secure the nip length L of the thermoplastic resin-coated metal plate 9 to be about 3 mm or more for roughening. Is. During this period, one surface of the resin-coated metal plate is roughened, but when the temperature of the thermoplastic resin-coated metal plate 9 is less than the softening point of the laminated thermoplastic resin film, the pressure is applied under the above-mentioned pressure condition. Even if the surface of the resin film cannot be provided with sufficient roughness, and if the nip length is less than about 3 mm, sufficient roughening cannot be performed, and the resin has a predetermined average surface roughness. It is impossible to obtain a coated metal plate. The nip length is determined by the roll diameter and roll material, but it is usually sufficient to secure about 3 to 20 mm.
About 10 mm is more preferable. When the resin films on both sides of the thermoplastic resin-coated metal plate 9 are formed to have a predetermined surface roughness, the roughening roll 10 and the backup roll 11 shown in FIGS. Additional rolls may be provided. Further, the resin-coated metal plate 12 subjected to the roughening process loses the average surface roughness formed on the laminated resin films when it is kept at a high temperature,
Since there is a high possibility of returning to the original state, it is preferable to cool as quickly as possible, and it is more preferable to cool the roughening roll.

FIGS. 4 (a) and 4 (b) show a surface-roughening roll having a predetermined surface roughness subjected to surface-roughening.
Reference numeral 15a in (a) indicates a roll surface forming a portion which becomes a can body wall when the obtained resin-coated metal plate is formed and processed. In the present invention, the roll surface of this portion of the roughening roll is Roughening processing was applied to a predetermined surface roughness. FIG. 4 (b) shows a resin film substrate to be laminated, which is mainly oriented in 45 ° and 135 ° directions with respect to the rolling direction.
It is an example of a roughening roll used when roughening is performed after laminating a resin film on a metal plate having a total of four ears. That is, 16 and 18 are roll surfaces that form the portion that will become the can body wall when the resin-coated metal sheet obtained is molded, and 18 corresponds to the portion where ears are easily generated by the molding process. Corresponds to the part that is likely to become a valley. FIG. 4B is an example in which only the surface of the roll indicated by 16 is roughened to a predetermined surface roughness. Further, in FIGS. 4A and 4B, 17 is a roll surface forming a portion that becomes a can bottom when forming the obtained resin-coated metal plate, and 15b indicates a portion that becomes scrap during the forming processing. It is the roll surface to be formed. Since the roll surface of the portions indicated by 15b and 17 forms a portion having little relation to the forming process of the obtained resin-coated metal sheet, it is not particularly necessary to limit the roughness of the roll surface of the portion. 18 is shown in FIG.
Although it is a roll surface that forms a portion that will be the body of the can, similar to 15a in Example 1, since it corresponds to a portion that easily forms ears, the roughness of the roll surface needs to be smaller than the roughness of the roll surface of portion 16. is there. It is not preferable for can-making that the roughness of the roll surface of the portion indicated by 17 is higher than that of the roll surface of 15a, or the portions of 16 and 18, and it is preferable that the roughness is the same or smaller. Further, it is preferable from the viewpoint of the yield during can making that the circular portions indicated by 15a or 16 and 18 are brought close to each other and the portion indicated by 15b is made as small as possible.

The strip-shaped thermoplastic resin-coated metal plate produced by the above-mentioned method, when passing through the roughening roll and the backup roll, has a portion having an average surface roughness Ra (W) and Ra (B). Part or Ra (V) part and Ra
The positions of the (M) portion and the Ra (B) portion are determined, and at that time, a suitable marking device, for example, Japanese Patent Laid-Open No.
-By marking the thermoplastic resin-coated metal plate 9 using the marking device disclosed in Japanese Patent Laid-Open No. 195651,
When the thermoplastic resin-coated metal plate 9 is blanked, its mark is detected and sequentially sent to a molding die for accurate molding. Therefore, in the apparatus for manufacturing a thermoplastic resin-coated metal plate of the present invention, a pair of It is preferable to install the marking device as described above behind the roughening roll and the backup roll.

[0027]

EXAMPLES The present invention will be specifically described below with reference to Examples and Comparative Examples. (Example 1) 0.18 mm thick TFS (amount of metallic chromium: 105 m)
g / m ² , hydrated chromium oxide amount: 15 mg / m ² as chromium 2
After heating to 45 ℃, biaxially oriented copolyester resin film with average surface roughness of 0.08μm, maximum surface roughness of 3.5μm and thickness of 25μm on both sides (88 mol% terephthalic acid, 12 mol% isophthalic acid, ethylene glycol) 100 mol%, melting temperature 228 ° C., softening temperature 199 ° C.) were laminated by thermal fusion, and then integrated in the manufacturing apparatus shown in FIG. 2, using the electrical discharge machining method, the average of the portion 15a in FIG. Surface roughness is 0.12μ
The average surface roughness of m, 15b and 17 is 0.0
The surface of the resin film is roughened by feeding it between a pair of rolls consisting of a forged steel roughening roll whose surface is roughened to 8 μm and a backup roll lined with fluororubber as an elastic lining. Immediately after being converted, it was immediately sent to a quench tank and rapidly cooled to fix the formed surface roughness to obtain the surface roughness shown in Table 1. The temperature of the resin-coated metal plate immediately before the roughening process is 205
Hold the temperature at ℃, apply a pressure of 5 kg per 1 cm of roll length between the roughening roll and the backup roll, crush the surface of the backup roll with the roughening roll, and
The roughening process was performed as the nip length of.

(Embodiment 2) The same TFS as in Embodiment 1 is used.
It is heated to 90 ℃, and biaxially oriented polyethylene terephthalate (melting temperature 255 ℃, softening temperature 244 ℃) with average surface roughness 0.56μm, maximum surface roughness 5.0μm, and thickness 25μm is laminated on both sides by heat fusion. After that, the average surface roughness of the portion 15a of FIG. 4 (a) is 3.2 μm, and the average surface roughness of the portions 15b and 17 is set to be 3.2 μm by using the electric discharge machining method incorporated in the manufacturing apparatus shown in FIG. The roughened roll made of forged steel with a roughened surface of 2.6 μm and a backup roll lined with fluororubber as an elastic lining are fed between a pair of rolls to roughen the resin film surface. Immediately after surface-izing, it was sent to a quench tank and rapidly cooled to fix the formed surface roughness to obtain the surface roughness shown in Table 1. The temperature of the resin-coated metal plate immediately before roughening is maintained at 260 ° C, and pressure of 12 kg per roll length of 1 cm is applied between the roughening roll and the backup roll. The surface of the backup roll was crushed by the roughening roll, and roughening was performed with a nip length of 10 mm.

(Embodiment 3) The same TFS as in Embodiment 1 is used.
After heating to 50 ℃, biaxially oriented copolyester resin film with average surface roughness 0.07μm, maximum surface roughness 3.6μm and thickness 25μm on both sides (upper layer: terephthalic acid 88mol%, isophthalic acid 12 Mol%, ethylene glycol 100
Copolymerized polyester resin consisting of mol%, melting temperature 228
℃, softening temperature 199 ℃ thickness 5μm, lower layer: terephthalic acid 94
Mol%, isophthalic acid 6 mol%, ethylene glycol 10
45% by weight of copolymerized polyester resin consisting of 0 mol% and 55% by weight of copolymerized polyester resin consisting of 100 mol% of terephthalic acid and 100 mol% of 1,4-butanediol are heat-melted to a thickness of 20 μm. After stacking by adhesion, the electric discharge machining method incorporated in the manufacturing apparatus shown in FIG.
The surface of the roll is roughened so that the average surface roughness of the 16 part of (b) is 0.12 μm, the average surface roughness of the 18 part is 0.10 μm, and the average surface roughness of the parts 15b and 17 is 0.08 μm. It is sent between a pair of rolls consisting of a forged steel roughening roll that has been subjected to chemical processing and a backup roll that is lined with fluororubber as an elastic lining to roughen the resin film surface and then immediately send it to the quench tank to quench it. The surface roughness thus formed was fixed and the surface roughness shown in Table 1 was obtained. The temperature of the resin-coated metal plate immediately before roughening is maintained at 215 ° C, and a pressure of 8 kg per roll length of 1 cm is applied between the roughening roll and the backup roll. The surface of the backup roll was crushed by the roughening roll, and roughening was performed with a nip length of 7 mm.

(Embodiment 4) The same TFS as in Embodiment 1 is used.
It is heated to 45 ℃ and a biaxially oriented film of three layers with an average surface roughness of 0.52μm, a maximum surface roughness of 4.8μm and a thickness of 25μm on both sides (upper layer: terephthalic acid 88mol%, isophthalic acid 12mol%, ethylene Copolyester resin consisting of 100 mol% of glycol, melting temperature 228 ℃, softening temperature 199 ℃, thickness
10 μm, Middle layer: Bisphenol A polycarbonate 35
65% by weight, a resin obtained by blending polyethylene terephthalate and polybutylene terephthalate in a weight ratio of 1: 1 65% by weight, thickness 10 μm, lower layer: terephthalic acid 88 mol%, isophthalic acid 12 mol%, ethylene glycol 100 mol% Copolymerized polyester resin having a thickness of 5 μm) was laminated by heat fusion, and the average surface roughness of the portion 16 in FIG. 4 (b) was measured using the electric discharge machining method incorporated in the manufacturing apparatus shown in FIG. 3.2 μm, the average surface roughness of 18 parts is 2.8
μm, average surface roughness of 15b and 17 is 2.6μm
The surface of the resin film is roughened by feeding it between a pair of rolls consisting of a forged steel roughening roll whose surface is roughened and a backup roll lined with fluororubber as an elastic lining. After that, it was immediately sent to a quench tank and rapidly cooled to fix the formed surface roughness to obtain the surface roughness shown in Table 1. The temperature of the resin-coated metal plate immediately before roughening is kept at 205 ° C, and a pressure of 9 kg per roll length of 1 cm is applied between the roughening roll and the backup roll. The surface of the backup roll was crushed by the roughening roll, and roughening was performed with a nip length of 8 mm.

(Comparative Example 1) A TFS similar to that of Example 1 was used.
After heating to 245 ° C., a biaxially oriented copolyester resin film similar to that of Example 1 was laminated on both sides by heat fusion, and immediately thereafter, it was sent to a quench tank and rapidly cooled. Therefore, the roughening process was not performed.

COMPARATIVE EXAMPLE 2 The same TFS as in Example 1 was used.
A biaxially oriented polyethylene terephthalate film similar to that of Example 2 was heat-sealed under the same conditions as in Example 2 except that the film was heated to 0 ° C., and the average surface roughness was 0.87 μm and the maximum surface roughness was 6.2 μm on both surfaces. After laminating with, the surface of the polyethylene terephthalate film was roughened under the same roughening conditions as in Example 2.

(Comparative Example 3) The same TFS as in Example 1 was used.
After heating to 90 ° C. and laminating a biaxial polyethylene terephthalate film similar to that of Example 2 on both sides by heat fusion under the same conditions as in Example 2, the average surface roughness of the portion 15a in FIG. Using the same roughening roll as in Example 2 except that the surface of the roll was roughened so that the average surface roughness of the portions of 15 b and 17 was 3.4 μm. Roughening similar to Example 2 The surface of the polyethylene terephthalate film was roughened under the roughening conditions.

(Comparative Example 4) A TFS similar to that of Example 1 was used.
After heating to 245 ° C. and laminating the same biaxially oriented copolyester resin film as in Example 1 on both sides by heat fusion, using the same production apparatus as in Example 1, roughening roll and backup roll Roll length between 1 cm
Roughening the copolymerized polyester resin film under the same roughening and roughening conditions as in Example 1 except that a pressure of 1.5 kg was applied and the surface of the backup roll was crushed by the roughening roll to obtain a nip length of 2 mm. processed.

In the thermoplastic resin-coated metal plates obtained in Examples 1 to 4 and Comparative Examples 1 to 4, after measuring the average surface roughness and the maximum surface roughness of the surface of each laminated resin film, With the exception of the thermoplastic resin-coated metal plate obtained in Comparative Example 1, molding was performed such that the surface having a large average surface roughness was the outer surface of the can. Further, the thermoplastic resin-coated metal plates obtained in Examples 1 and 4 were molded such that the surface having a large average surface roughness was the inner surface of the can, and these were designated as Examples 5 and 6. The molding process is described below.
First, glamor wax (boiling point 200 ° C.) was applied to both surfaces of a thermoplastic resin-coated metal plate, and then a blank having a diameter of 180 mm was punched out to obtain a squeezed can having a diameter of 100 mm. Then, it was redrawn to obtain a redrawn can having a diameter of 80 mm. This re-drawing can was subjected to a stretching process and an ironing process at the same time by a composite process to obtain a drawn and ironed can with a diameter of 66 mm. In this combined processing, the distance between the redrawing part and the ironing part, which are the upper end of the can, is 20 mm, and the shoulder radius of the redrawing die is
1.5 times, the clearance between the redrawing die and the punch is
The clearance was 1.0 times, and the clearance of the ironing part was 50% of the original plate thickness. In each of the examples and comparative examples, four ears were generated in the obtained can body. The moldability of the obtained body of the can and the moldability of the upper part of the can were evaluated by the following methods.

(A) Molding processability of the body of the can body In the can body obtained as described above, 4 from the can bottom
The heights of the maximum height and the minimum height including four ears (the portions that became the four valleys) were measured, and the average value thereof was calculated and displayed as follows. △ H: Height from valley to protruding part (unit: mm) H: Height from bottom of can to valley (unit: mm) (B) Molding of can upper part Processability In the can body obtained as described above, 125
Wrinkles and cracks that occur when a neck-in process is performed at a diameter reduction rate of 16% using the spinning method after cutting out the part with a uniform height of 125 mm by cutting out the part with uneven height of 125 mm. The occurrence state of was observed with the naked eye and evaluated according to the following criteria to determine whether the moldability of the upper part of the can body was good or bad. A: No wrinkles or cracks are observed. ◯: A slight wrinkle is observed, but there is no problem in practical use, Δ: Wrinkle and slight cracking are observed. ×:
Significant wrinkles and cracks are observed. The evaluation results are shown in Tables 1 and 2.

[0037]

[Table 1] (Note) Ra ^* : There is no distinction between the body of the can and the bottom of the can on the inside of the can, and the average roughness (Ra) of the entire film after lamination is shown. Comparative Example 2: Glamor wax remains after post-molding and post-heating

[0038]

[Table 2] (Note) Ra ^** : There is no distinction between the can body and the can bottom on the outer surface of the can, and the average roughness (Ra) of the entire film after lamination is shown.

After being laminated on a metal plate by heat fusion, the surface of the thermoplastic resin film, which is to be the bottom of the can, is roughened, and the average roughness and the maximum surface roughness thereof are within the range defined by the present invention. In that case, the moldability is improved, and a can having a high can height is obtained. Further, the ears generated during the drawing process can be suppressed to be small by making the average roughness of the surface of the film in the valleys larger than that of the ears. However, if the degree of roughening is larger than the limited range, it breaks during molding, and if the degree of roughening is smaller than the limited range, the moldability does not improve, and only cans with a low can height are used. I can't get it. Further, when the resin film having the maximum surface roughness exceeding the range limited in the present invention is used, the glamor wax as the lubricant remains even after the can body is heated after the molding process. From the above results, the resin film laminated on the thermoplastic resin-coated metal plate is subjected to surface roughening processing in a predetermined pattern to form an average surface roughness and a maximum surface roughness limited to a specified range. The molding processability is improved, the amount of material used can be reduced, and the circumferential wall thickness of the upper part of the can is made uniform, so the defect occurrence rate at the time of reducing the diameter of the upper end is extremely reduced. It turns out that it is possible.

[0040]

EFFECTS OF THE INVENTION The thermoplastic resin-coated metal sheet of the present invention is excellent in moldability and not only makes it possible to reduce the amount of material used, but also reduces the anisotropy during molding. Therefore, it is a resin-coated metal plate that causes little ears even when subjected to severe drawing and has little plate thickness variation of the can body wall. Further, the resin-coated metal plate having these excellent properties is obtained by laminating a resin film on a metal plate by heat fusion, and then laminating the resin film surface to a rough surface using a roughening roll having a predetermined pattern. It can be manufactured by using an extremely simple manufacturing apparatus that does not involve complicated operations such as chemical processing and roughening in a predetermined pattern, and its industrial value is extremely large.

[Brief description of drawings]

FIG. 1 is a plan view schematically showing an embodiment of a thermoplastic resin-coated metal plate of the present invention.

FIG. 2 is a schematic view showing an embodiment of an apparatus for producing a thermoplastic resin-coated metal plate of the present invention.

FIG. 3 is an enlarged view of a contact portion between a roughening roll and a backup roll.

FIG. 4 is a schematic view showing an example of a roughening roll used for producing the thermoplastic resin-coated metal plate of the present invention.

[Explanation of symbols]

Arrows: Rolling direction 1,9: Thermoplastic resin-coated metal plate 1a: Part that becomes a can barrel wall by molding 1b: Part that becomes scrap during molding 2a: Part that becomes a can barrel wall by molding, and Part that is likely to be a valley by molding 2b: A part that will be a can body wall by molding and is likely to have ears by molding 3: Part that will be a can bottom by molding 4: Metal plate 5: Heating means 6 : Final heating roll 7: Thermoplastic resin film 8: Laminating roll 10: Roughening roll 11: Backup roll 12: Roughened thermoplastic resin-coated metal plate 13: Quench titanium 14: Coil winding means 15a: Roll surface that forms a portion that will become a can body wall when forming a thermoplastic resin-coated metal plate 15b: Thermoplastic resin-coated metal Roll surface 16 that forms a part that becomes a scrap when forming a plate: A part that becomes a can body wall when forming a thermoplastic resin-coated metal plate and forms a part that easily forms a valley by forming Roll surface 17: When forming a thermoplastic resin-coated metal plate, forming a portion that becomes a can bottom. Roll surface 18: When forming a thermoplastic resin-coated metal plate, a portion that becomes a can body wall, and Roll surface that forms the part where ears are likely to occur by molding

Claims (9)

[Claims] 1. A metal plate having a thermoplastic resin film coated on at least one surface thereof, wherein the surface roughness of the film surface layer is made different between a portion having a large proportion to be stretched by a molding process and a portion having a small proportion to be stretched by a molding process. A thermoplastic resin-coated metal plate with excellent moldability. 2. A metal plate in which both surfaces of a metal plate are covered with a thermoplastic resin film with or without a thermosetting resin adhesive, and the thermoplastic resin laminated on at least one surface of the metal plate. Maximum surface roughness Rma of resin film surface
x is 5 μm or less, and when the thermoplastic resin film-coated metal plate is processed into a two-piece can, the average surface roughness of the surface layer of the thermoplastic resin film laminated on the portion that will be the can body wall is Ra (W ), When the average surface roughness of the thermoplastic resin film surface layer laminated on the portion to be the bottom of the can is Ra (B), Ra (W) is 0.1 to 3.0 μm, and Ra
A thermoplastic resin-coated metal plate excellent in moldability, characterized in that the surface roughness of the thermoplastic resin film is partially made different beforehand so that (W) ≧ Ra (B). 3. A metal plate in which both surfaces of a metal plate are covered with a thermoplastic resin film with or without a thermosetting resin adhesive, and the thermoplastic resin laminated on at least one surface of the metal plate. Maximum surface roughness Rmax of resin film is 5
μm or less, and the thermoplastic resin film laminated on a portion which becomes a can body wall when the thermoplastic resin film-coated metal plate is formed into a two-piece can and which forms a valley by the forming process. And the average surface roughness of the thermoplastic resin film laminated on the ear portion is Ra (M), and the thermoplastic resin laminated on the can bottom portion. When the average surface roughness of the film is Ra (B), the Ra (V) is 0.1 to 3.0 μm.
And the surface roughness of the thermoplastic resin film is partially made different beforehand so that Ra (V) ≧ Ra (M) ≧ Ra (B). Thermoplastic resin coated metal plate. 4. A film comprising the thermoplastic resin film of any one of polyethylene terephthalate, polybutylene terephthalate, a copolymerized polyester resin containing ethylene terephthalate repeating units as a main component, and a polyester resin containing butylene terephthalate repeating units as a main component, or The thermoplastic resin-coated metal sheet according to claim 1 or 2, which is a film made of a polyester resin blended with at least two kinds of the above resins, or a multilayer film formed by laminating the at least two kinds of polyester resins. . 5. A film made of a composite resin in which the thermoplastic resin film is a blend of the polyester resin according to claim 3 and a bisphenol A polycarbonate resin,
Alternatively, a composite resin obtained by blending the polyester resin according to claim 3 with the bisphenol A polycarbonate resin as an upper layer and a lower layer, or a multilayer film having the bisphenol A polycarbonate resin as an intermediate layer. Claim 1 or 2 which is
The thermoplastic resin-coated metal plate according to. 6. The biaxially oriented film in which the thermoplastic resin film is biaxially stretched after film formation.
The thermoplastic resin-coated metal plate according to claim 1. 7. A metal plate having a pair of laminating rolls arranged such that a continuously advancing strip-shaped metal plate is heated, a thermoplastic resin film is brought into contact with both surfaces of the metal plate, and both surfaces of the metal plate are sandwiched therebetween. After pressure-bonding the thermoplastic resin film with the, the metal plate covered with the thermoplastic resin film, the temperature of the softening point of the thermoplastic resin film or higher is held, facing below the laminating roll. Is disposed between the at least one pair of rolls, one of which has a surface roughened in a predetermined pattern and the other of which is a backup roll having an elastic member on the surface, and the layers are stacked. Roughening processing is performed on the surface of the thermoplastic resin film, and the thermoplastic resin film surface is immediately cooled after forming a predetermined average surface roughness,
A method for producing a thermoplastic resin-coated metal plate, which fixes the formed average surface roughness. 8. After laminating the thermoplastic resin film on the metal plate, the metal plate coated with the thermoplastic resin film is 3 mm by a roll having the surface roughened and the backup roll. The method for manufacturing a thermoplastic resin-coated metal plate according to claim 6, wherein the nip length is held. 9. A means for heating a continuously progressing strip-shaped metal plate, and a means provided below the metal plate in the traveling direction.
A means for supplying a thermoplastic resin film, further provided below it, abutting the thermoplastic resin film on both sides of the metal plate, sandwiching both from the left and right, a pair of laminating rolls for pressure bonding, Further provided below the roll, one of which has a surface roughened,
A thermoplastic resin-coated metal, the other of which is composed of at least a pair of rolls including a backup roll having an elastic member on the surface thereof, and a cooling means provided below the rolls for cooling the thermoplastic resin film-coated metal plate. Plate manufacturing equipment.