JP5078155B2 - Method for producing resin-coated metal sheet - Google Patents

Description

The present invention relates to a method for producing a resin-coated metal plate having excellent work adhesion.

In recent years, steel sheets coated with resin are further stretched after drawing and drawing,
A can body part that has been subjected to severe processing such as further ironing after drawing, further stretching and ironing after drawing, etc. Cans are produced by winding plates.
In these cans, excellent adhesion of the resin to the steel sheet is required so that the coating resin does not peel or break during or after the severe forming process.
Therefore, a resin-coated chromate-treated steel sheet in which an organic resin is coated on a chromate-treated steel sheet such as tin-free steel having a chromate film excellent in processing adhesion formed on the surface has been used as a material for these cans.

However, in cans using resin-coated chromate-treated steel sheets, if fine holes or cracks that reach the steel sheet surface occur in the resin layer, the chromate-treated steel sheet has poor corrosion resistance. When filled, there was a problem that the corrosion of the steel sheet was likely to proceed rapidly.
Therefore, even when filling the can with high acidity contents, application of a resin-coated tin-plated steel sheet obtained by coating a resin on a tin-plated steel sheet exhibiting excellent corrosion resistance has been attempted. Therefore, the development of a material excellent in film processing adhesion has been demanded even in severe processing applications as described above.

In order to solve such problems, Patent Document 1 discloses that a silane coupling agent coating layer is provided on a tin-plated layer of a no-reflow tin-plated steel sheet or a reflow tin-plated steel sheet, and an organic resin film is further laminated. A resin-coated tin-plated steel sheet is described.

JP 2002-285354 A

However, when the resin-coated tin-plated steel sheet of Patent Document 1 is formed into a can body by further using a stretch process and an ironing process after drawing, the resin may peel off at the top of the can body during the forming process. There was a problem in film processing adhesion during can body processing.
An object of the present invention is to solve the above-mentioned problems and to provide a method for producing a resin-coated tin-plated metal plate having excellent film processing adhesion even during severe molding.

(1) The method for producing the resin-coated metal plate of the present invention comprises:
Forming a tin plating layer on at least one side of the metal plate;
Applying a silane coupling agent on the tin plating layer;
Forming a resin layer on the silane coupling agent coating layer;
At least the interface region between the tin plating layer and the silane coupling agent coating layer,
Silane coupling agent coating layer and the interface region between the silane coupling agent coating layer and the resin layer,
Heating to a melting point of the resin of −10 ° C. to a melting point of the resin of + 100 ° C .;
After the metal plate is heated, the resin is cooled at a rate of 30 ° C./second or more in the crystallization temperature region of the resin .
In addition, about the conditions which the said tin plating layer and the said resin layer do not raise | generate a shape change, heating temperature does not rise too much so that the shape of a tin plating layer and a resin layer may not collapse, and a resin layer softens or melt | dissolves. This can be realized by controlling the adhesion to be improved. For example, in the case of high-frequency heating, it is possible to control the output of the transmitter of the high-frequency heating device by controlling the high-frequency current, direct current, and direct-current voltage, and change the maximum heating temperature and heating time. is there.
Further, "at least the interface region between the tin plating layer and the silane coupling agent coating layer, the silane coupling agent coating layer and the interface region between the silane coupling agent coating layer and the resin layer, and the melting point of the resin. Regarding “heating to −10 ° C. to the melting point of the resin + 100 ° C.”, for example, the whole steel sheet is heated by high-frequency heating to control high-frequency current and direct current, and the output of the transmitter of the high-frequency heating device is controlled. By changing the maximum heating temperature and the heating time, it is possible to increase the temperature at a location where dissolution is desired to occur, and to suppress the temperature rise at a certain temperature or less at other locations.
(2) The method for producing a resin-coated resin-coated metal sheet according to the present invention is characterized in that, in (1) , the heating temperature is a melting point of the resin + 30 ° C. to a melting point of the resin + 60 ° C.
(3) The method for producing a resin-coated metal sheet according to the present invention is characterized in that, in (1) or (2) , the heating is performed by high-frequency heating.
(4) The method for producing a resin-coated metal plate of the present invention is the method according to any one of (1) to (3) , wherein the resin crystallization temperature region is set to 5 ° C./temperature with respect to the temperature of the resin during the heating. The heating is performed at a rate of at least seconds.
(5) The method for producing a resin-coated metal sheet according to the present invention is characterized in that, in any of the above (1) to (4) , the tin plating layer has a tin plating amount of 0.5 to 13 g / m ^2. And
(6) In the method for producing a resin-coated metal plate of the present invention, in any one of (1) to (5) , the silane coupling agent is a water-soluble amino silane coupling agent,
The Si adhesion amount is 0.5 to 30 mg / m ² .

The method for producing a resin-coated metal plate of the present invention is a process superior to conventional processes because a silane coupling agent is applied onto a tin plating layer, and a resin film is thermally bonded and laminated thereon, followed by heat treatment. A resin-coated metal plate showing adhesion can be provided.

Hereinafter, embodiments of the present invention will be described in detail.
[Metal plate]
As a metal plate used for the resin-coated metal plate of the present invention, a cold rolled steel sheet having a thickness of 0.15 to 0.3 mm is obtained by cold rolling, annealing, and tempering a normal aluminum killed steel hot rolled sheet. Alternatively, a cold-rolled steel sheet or the like that is further cold-rolled after annealing to increase the strength is used depending on the application.
After these cold-rolled steel sheets are electrolytically degreased and pickled, a tin-plated layer is formed on the steel sheets to obtain tin-plated steel sheets.
As the tin-plated steel sheet, tin plating is performed using a known ferrostan bath, halogen bath, or sulfuric acid bath, heated to a temperature higher than the melting temperature of tin, and then rapidly cooled (reflow treatment) between the Sn-Fe layers. A tin-plated steel sheet on which an alloy layer is formed, a tin-plated steel sheet in which the tin-plated layer is not heat-melted (no reflow treatment), or the like can be applied.
Further, nickel plating is performed on the cold-rolled steel sheet, and then tin plating is performed on the upper layer or on the upper layer in which Ni is diffused in the steel by heating after nickel plating to form a Ni-Fe alloy layer, An island-shaped tin-plated steel sheet in which an island-shaped tin layer is formed using a method such as heating after the melting temperature of tin or higher and then rapidly cooling can also be used.

It is preferable that the tin plating amount in a tin plating steel plate exists in the range of 0.5-13 g / m < ² > from a corrosion-resistant and economical viewpoint. Less than 0.5 g / m ² is not preferable because the corrosion resistance is insufficient.
In particular, when the reflow treatment is performed, all of the plated tin becomes an Fe—Sn alloy and not only the corrosion resistance but also the workability is remarkably deteriorated. Therefore, a tin plating amount of at least 0.5 g / m ² or more is required.
On the other hand, if it exceeds 13 g / m ² , the corrosion resistance effect required for beverage cans and food cans is saturated, and tin melting unevenness and edge sag occur at the time of reflow, resulting in poor tint surface condition.

Next, a silane coupling agent is applied on the tin plating layer formed as described above and dried.
Examples of the silane coupling agent include vinyl, acrylic, epoxy, amino, mercapto, chloropyr, and the like, and water-soluble coupling agents are mentioned from the viewpoint of handling and environment.
It is also important to have excellent storage stability, and the resin-coated metal plate must be non-toxic because it is applied to food cans and beverage cans.
When these are judged comprehensively, it is most preferable to apply an amino silane coupling agent.
As an amino-based silane coupling agent, aminopropyltrimethoxysilane, aminopropylmethyldiethoxysilane, aminopropyltriethoxysilane, phenylaminopropyltrimethoxysilane, etc. can be used. As an example, Shin-Etsu Chemical Co., Ltd. KBM-903, KBM603, KBE903, and the like, which are preferable because they are excellent in water solubility and storage stability and have been approved by the FDA (Food and Drug Administration).
A 5-200 g / L aqueous solution of a silane coupling agent is applied to the above tin-plated steel sheet and dried.
As the coating and drying method, known methods can be applied, and examples thereof include a coating method such as a dipping method, a roll coating method, a method of squeezing the excess using a squeezing roll after dipping, a spray method, an electrolytic treatment method, etc. A drying method using an oven at 100 ° C. for 5 minutes can be mentioned.

The resin-coated metal sheet of the present invention is obtained by laminating an organic resin film to be a resin layer on one side or both sides of the tin-plated steel sheet obtained as described above so as to be in contact with the silane coupling agent coating layer. It is done.
As the organic resin film, a thermoplastic resin excellent in processability after heating is preferable,
Polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, ethylene terephthalate / ethylene isophthalate copolymer, butylene terephthalate / butylene isophthalate copolymer, or a blend of two or more of these polyester resins, polyethylene , Polypropylene, ethylene / propylene copolymers, and those modified with maleic acid, polyolefin resins such as ethylene / vinyl acetate copolymer, ethylene / acrylic acid copolymer, 6-nylon, 6,6-nylon, 6 , 10-nylon and other polyamide resins, polycarbonate, polymethylpentene, and a single layer resin film comprising a blend of the above polyester resin and ionomer, A resin film of a double layer consisting of two or more these resins.
The thickness of the resin film is 10 to 100 μm from the viewpoint of ease of film laminating work, adhesion strength of the resin film in a molded body (can, etc.) after molding the resin-coated metal plate, corrosion resistance, and economy. It is preferable that

These resin films are obtained by heating and melting resin pellets, and extruding them from a T-die of an extruder to form a film having a desired thickness, which is applied to a tin-plated layer of a tin-plated steel sheet. A resin layer is formed on the coupling agent coating layer.
As this resin layer forming method, for example, a thermal bonding method can be cited. The resin film is brought into contact with a tin-plated steel plate heated to a predetermined temperature range, and sandwiched between a pair of pressure rolls and pressed. Press contact.
According to this method, it is possible to perform heat bonding at a temperature considerably lower than the melting temperature of tin by using the formed resin film without performing a drawing process.

[Material treatment]
In the present invention, after the resin layer is formed, an interface region between the tin plating layer and the silane coupling agent coating layer, a silane coupling agent coating layer, and an interface region between the silane coupling agent coating layer and the resin layer are further provided. , “Melting point of coating resin—10 ° C.” to “Melting point of coating resin + 100 ° C.” A so-called post-heating treatment is performed as a material treatment.
A more preferable post-heating temperature is in the range of “melting point + 30 ° C.” to “melting point + 60 ° C.” of the coated resin film.
When the heating temperature of the coating resin film is less than “the melting point of the coating resin −10 ° C.”, the interface region is not sufficiently softened to improve the adhesion, and the adhesion effect of the silane coupling agent by heating is sufficient. It is not demonstrated.
On the other hand, if the heating temperature is higher than “the melting point of the coating resin + 100 ° C.”, the temperature of the bulk layer in the resin layer is excessively increased, and bubbles are easily generated in the resin layer, which is not preferable.
In the post-heating, the interface region becomes the temperature range while preventing bubbles from being generated in the resin layer, and the resin layer and the tin plating layer are softened and melted only in the interface region, thereby improving the adhesion. To do.

As a specific means, an apparatus as shown in FIG. 1 is used, and a high frequency coil is wound at right angles to the traveling direction on a resin-coated metal plate that is passed through after resin coating, as shown in FIG. Heating to a predetermined temperature, starting the high frequency coil, air cooling, then water cooling to room temperature is preferable.

[Application of silane coupling agent]
Next, the effect of the silane coupling agent on the film adhesion during the post-heating treatment will be described in detail with reference to FIGS.
In a state where the resin is coated on the tin-plated steel sheet after the silane coupling agent treatment,
As shown in FIG. 3, a large amount of OH groups remain at the interface between the tin-plated steel sheet and the coated resin film, and the adhesion is low.

The coating amount of the silane coupling agent is preferably 0.5 to 30 mg / m ² in terms of Si adhesion.
When the Si adhesion amount is less than 0.5 mg / m ² , the processing adhesion of the coating resin laminated on the silane coupling agent coating layer is not improved, and the effect of the present invention cannot be obtained.
On the other hand, even if the Si adhesion amount exceeds 30 mg / m ² , the coating resin is not further improved, and further application is unnecessary from the viewpoint of cost.

After that, when the resin-coated metal plate is heated to a temperature of “the melting point of the coating resin—10 ° C.” or higher,
As shown in FIG. 4, the dehydration condensation reaction of the silane coupling agent proceeds sufficiently,
The bonding force between Sn and film is strengthened, and the adhesion is remarkably improved.
The resin layer started to soften at a temperature about 10 ° C. below the nominal melting point from the DSC (Differential Scanning Calorimetry) curve and the effect of this treatment was observed even at a temperature 10 ° C. below the resin melting point. In the present invention, the heating temperature is equal to or higher than “the melting point of the coating resin—10 ° C.”.

The heating rate of the resin-coated resin-coated metal plate is
From the viewpoint of preventing crystallization of the resin film, it is preferable to raise the temperature of the crystallization temperature region (120 ° C. to 180 ° C.) of the resin film in as short a time as possible.
It is preferable to employ a processing means having a high heating rate such as high-frequency wave induction heating or electric heating.
However, after coating, holding the resin film in the crystallization temperature range,
Since the crystallization of the resin film progresses, it causes troubles such as delamination during can body processing.
The heating rate of the resin-coated steel sheet is desirably 5 ° C./sec or more.
At a heating rate of less than 5 ° C / sec,
Since the transit time in the crystallization temperature region becomes long and crystallization of the resin film is considered to proceed, it is not preferable.

The determination of the coating amount of the silane coupling agent will be described below.
Next, the adhesion strength of the resin layer coated by the above processing method will be described.
FIG. 5 is a graph showing the relationship between the silane coupling agent application amount (horizontal axis) and the S peel strength (vertical axis).
As shown in FIG. 5, even when a silane coupling agent is applied, the film adhesion is not so much in “no post-heating” and “oven heating (heating up to 260 ° C. at 2 ° C./sec....slow heating)” Does not improve.
On the other hand, in “high frequency induction heating (heating up to 260 ° C. at 100 ° C./sec....high speed heating),
As the coating amount of the silane coupling agent increases, the S peel strength increases. When the Si adhesion amount = 6 mg / m ² , the film adhesion (S peel strength) becomes maximum, and the silane coupling agent coating amount: Si adhesion amount = 30 mg. Even if / m ² , it is effective to improve the adhesion as compared to when it is not present. However, if the amount of Si adhesion exceeds 30 mg / m ² , it is considered that the adhesion is lowered because cohesive failure of the silane layer occurs.

Next, the resin-coated metal plate coated by the above processing method is formed into a shallow drawn cup, and the result of examining the size of the cup delamination width in that case in relation to the amount of silane coupling agent applied is shown in FIG. Show.
Even if the silane coupling agent is applied, delamination is hardly eliminated by “no post-heating” and “oven heating (heating up to 260 ° C. at 2 ° C./second, low-speed heating)”.
On the other hand, in “high frequency induction heating (heating up to 260 ° C. at 100 ° C./sec....high speed heating),
As the amount of silane coupling agent increases, the cup delamination width decreases,
Application amount of silane coupling agent: Si adhesion amount = 0.5 mg / m ² is exceeded, delamination almost disappears.
Therefore, the coating amount of the silane coupling agent is preferably Si adhesion amount = 0.5 to 30 mg / m ² , more preferably 0.5 to 6 mg / m ² .
Here, the cup delamination width means a value measured as follows. That is, the tip of the cup is enlarged and photographed with a microscope, and the end of the photograph is observed to measure the delamination width.
Note that a fluorescent X-ray method or the like can be applied to the measurement of the Si adhesion amount.

[Processing material cooling rate]
Moreover, also in the cooling method after post-heating of the resin-coated metal plate, it is preferable to pass the above-described resin crystallization temperature region (120 ° C. to 180 ° C.) in a short time.
That is, it is desirable to cool the resin at a rate of 30 ° C./second or more in the crystallization temperature region of the resin after post-heating.
A cooling rate of 30 ° C./second is not preferable because it takes a long time to pass through the crystallization temperature region and crystallization of the resin film proceeds.
For this reason, it is preferable to employ water cooling means such as spray and dip as the cooling means.

Hereinafter, this invention is demonstrated concretely using Examples 1-12 and Comparative Examples 1-3.
[Creation of tin-plated steel sheet]
Using the low-carbon cold-rolled steel sheet shown in the “plate thickness” column of Table 1, after electrolytic degreasing-water washing, sulfuric acid washing-water washing in an alkaline aqueous solution, using a ferrostan bath,
A tin plating layer was formed under the conditions shown in Table 1 and reflowed.
Next, an aqueous solution of a silane coupling agent was applied and dried on the tin plating layer to form a silane coupling agent coating layer having an Si adhesion amount shown in the Examples and Comparative Examples of Table 1.

[Production of resin-coated metal sheet]
A clear unstretched film of a transparent ethylene terephthalate / ethylene isophthalate copolymer (PETI) having a thickness of 28 μm is provided on one side of the tin-plated steel sheet shown in Examples 1 to 12 and Comparative Examples 1 to 3 (on the inner side of the can). ,
A white white unstretched film containing 20% by mass of a titanium-based white pigment in the same ethylene terephthalate / ethylene isophthalate copolymer was laminated on the other side (being the outer surface of the can) under the conditions shown in the table. .
The resin film was immediately cooled after the lamination.
Furthermore, after the lamination of the resin film was completed, post-heating treatment was performed under the processing conditions for the material to be processed shown in Table 1 to prepare a resin-coated metal plate.
Here, Ihf in the high frequency induction heating setting conditions in Table 1 is a high frequency current before the output transformer, IdcL is a direct current obtained by converting the alternating current into a direct current by a rectifier, and Vdc is a direct current voltage obtained by changing the power supply voltage to a direct current. And Ihf = 38.5 [A], IdcL = 10.7 [A], and Vdc = 280 [V].
Of these, the heating temperature can be increased by increasing Ihf and IdcL.
Further, “MAX plate temperature” in the processing condition of the material to be processed in Table 1 indicates the maximum value of the plate temperature during heating, and is divided by the time taken for the rising temperature at the heating rate from room temperature to the MAX plate temperature. Is required.
The “plate temperature heating rate” in Table 1 is a value indicating how much temperature is raised per second, and is a cooling rate from the MAX plate temperature to room temperature, and is obtained by dividing the descending temperature by the time taken.
“Cooling temperature” in Table 1 is a value indicating how much the temperature is lowered per second.

[Evaluation]
The evaluation of the work adhesion of the coating resin to the tin-plated steel sheet is evaluated by employing the S peel strength as the peel strength.
Conventionally, the T peel strength was measured and evaluated in the state of the flat plate before processing, but it is considered that the processing adhesion is not necessarily accurately reflected.
In the present invention, adhesiveness during processing and after processing (processing adhesion) when subjected to strict molding processing such as forming into a can body by further combining drawing processing and ironing processing after drawing processing The S peel strength is adopted as an evaluation method that accurately reflects.
The S peel strength is obtained by drawing a resin-coated metal plate into a cup, cutting the specimen from the side wall of the cup, and evaluating the work adhesion strength by the peel strength of the resin film of the specimen.

A specific method for measuring the S peel strength is shown below.
A blank having a diameter of 154 mm is punched out of the resin-coated metal plate, and a first-stage drawing is performed at a drawing ratio of 1.64 to form a drawn cup having a diameter of 96 mm and a height of 42 mm.
From this cup, the side wall of the squeezed cup is cut out in a cup height direction: 30 mm and a cup circumferential direction: 120 mm, bent back into a flat plate shape, and then a T-shape having a size as shown in the plan view of FIG. The test piece 71 is punched out using a press die.
Next, as shown in FIG. 8, a coating resin (on the back side in the figure) on the side opposite to the adhesion strength measuring surface (the front side in the figure) of one (right) end 71 a of the test piece 71 using a cutter knife is used. A cut 72 is made in the surface) so as to reach the surface of the tin-plated steel plate.
Further, as shown in FIG. 9 and FIG. 10, using the score processing die set, after putting the score 73 on the side opposite to the adhesion strength measurement surface (the surface with the cut 72), the score portion is bent. Only the tin-plated steel sheet is cut.
At this time, on the adhesion strength measurement surface, the coating resin remains connected to both sides of the cut and separated tin-plated steel sheet without being cut.
Next, as shown in FIG. 11, after inserting one end 71 a into the specimen insertion portion 74 a of the specimen holder 74 and fixing the specimen 71 to the specimen holder 74, the upper part 74 b of the specimen holder 74 and the specimen 74 are arranged. The other end 71b of the piece 71 is pulled between both chuck portions of a tensile tester, the coating resin is forcibly peeled from the tin-plated steel sheet, the tensile strength is measured, and the S peel strength is evaluated to evaluate the work adhesion strength. .

The S peel strength measured as described above is preferably 0.6 kg / 15 mm or more when the width of the specimen is 15 mm. If the S peel strength is less than 0.6 Kg / 15 mm, stable and good work adhesion cannot be obtained in severe molding processes such as a can-making process using a stretch process and an ironing process after drawing.

In this example, after punching the resin-coated metal plates of Examples 1 to 12 and Comparative Examples 1 to 3 shown in Table 1 into a blank having a diameter of 151 mm, the transparent resin film-coated surface is on the cup inner surface side. (The surface coated with a resin film containing a white pigment is the outer surface of the can), and a 1st drawing cup, B / M can, and Fi can are made by performing a one-stage drawing process with a drawing ratio of 1.64. Specimens for measuring S peel strength were prepared so that the transparent resin film-coated surface was the measurement surface.
Next, the S peel strength was measured using a tensile tester.
Also, the presence or absence of delamination (film peeling) of the 1st cup and B / M can was observed.
Furthermore, about the Fi can, the retort damage | dermatism evaluation was confirmed visually on the outer surface white side and the inner surface clear side.
In addition, 1st cup means what was manufactured by squeezing a board, and B / M can is a thing formed by further squeezing and squeezing the 1st cup to form a can with a small can diameter and a high side wall height. Good, Fi cans are manufactured by trimming, flange and neck processing of B / M cans.

The results are shown in Table 2.
The cups of Examples 1 to 12 show that the inner surface S peel strength is 0.7 kg / 15 mm or more in any of the 1st cup, the B / M can, and the Fi can, and the resin during severe can molding processing. Excellent film processing adhesion.
Furthermore, the cup tip delamination of the 1st cup and the B / M can was not observed, and the retort scratch delamination of the Fi can was not observed.
On the other hand, in Comparative Examples 1 to 3, when the 1st cup was formed, the resin film at the tip of the cup and the tin-plated steel sheet had poor adhesion, and delamination occurred at the tip of the cup.
Note that Comparative Examples 1 and 2 were unsuitable as materials for can body processing due to the occurrence of broken bodies during B / M can processing.
In addition, the up arrow in a table | surface shows that it is the same as the value as described in the upper column.

以上説明したように、絞り加工、絞り加工後のさらなるストレッチ加工、絞り加工後のさらなるしごき加工、のいずれの加工を施しても、成形加工時において樹脂フィルムが剥離することなく、安定した、また、より過酷な絞り加工後にさらにストレッチ加工としごき加工を併用する加工を施す缶体成形加工時においても、樹脂フィルムが剥離することがなく、安定して優れた加工密着性を示す樹脂被覆金属板を提供することができる。

As described above, even if any of the drawing process, the further stretching process after the drawing process, and the further ironing process after the drawing process, the resin film does not peel off during the molding process, Resin-coated metal plate that shows stable process adhesion without causing the resin film to peel off even during the can body forming process, which is subjected to processing that uses both stretching and ironing after more severe drawing Can be provided.

The resin-coated metal plate of the present invention obtained by laminating a resin film on a tin-plated steel sheet provided with a silane coupling coating layer and then subjecting it to a post-heating treatment is a resin film that is not subjected to a post-heating treatment. Compared to a resin-coated metal plate laminated on a tin-plated steel sheet provided with a layer, the resin film has excellent work adhesion to a tin-plated steel sheet, and the industrial applicability is extremely high.

It is a schematic perspective view which shows the means to wind after winding a high frequency coil with respect to the resin coated metal plate which passes through after resin coating, at right angles to the traveling direction. It is a graph which shows the heating cycle of post-heating. It is explanatory drawing which shows the state which coat | covered resin, after performing a silane coupling agent process to a tin plating steel plate. After the state of FIG. 3, the resin-coated metal plate is subjected to a heat treatment of “the melting point of the coated resin—10 ° C.” or more, and the dehydration condensation reaction of the silane coupling agent proceeds sufficiently so that the binding force between the tinplate and the film It is explanatory drawing which shows the state which became strong and adhesiveness improved remarkably. It is a graph which shows the relationship between a silane coupling agent application amount (horizontal axis) and S peel strength (vertical axis). It is a graph which shows the result of shape | molding the resin-coated metal plate after post-heating to a shallow drawing cup, and investigating the magnitude | size of the cup delamination width | variety in that case in relation to the application amount of a silane coupling agent. It is a top view which shows the shape of the test piece for S peel strength measurement. It is a top view which shows the state which cut | disconnected the coating resin surface of the test piece for S peel strength measurement. It is a top view which shows the state which put the score in the test piece for S peel strength measurement. It is a fragmentary sectional view of the specimen for S peel strength measurement which shows the shape of the part which put the score. It is a schematic perspective view which shows the state which puts the test piece for S peel strength measurement in a test piece holder, and measures intensity | strength.

Explanation of symbols

71: Specimen 71a: One end 71b of the specimen: The other end 72 of the specimen: Cut 73: Score 74: Specimen holder 74a: Specimen insertion part 74b: Upper part of the specimen holder

Claims (6)

Forming a tin plating layer on at least one side of the metal plate;
Applying a silane coupling agent on the tin plating layer;
Forming a resin layer on the silane coupling agent coating layer;
At least the interface region between the tin plating layer and the silane coupling agent coating layer,
Silane coupling agent coating layer and the interface region between the silane coupling agent coating layer and the resin layer,
Heating to a melting point of the resin of −10 ° C. to a melting point of the resin of + 100 ° C .;
A method for producing a resin-coated metal plate , wherein the resin is cooled at a rate of 30 ° C./second or more in a crystallization temperature region of the resin after the metal plate is heated . The method for producing a resin-coated metal plate according to claim 1 , wherein the heating temperature of the metal plate is the melting point of the resin + 30 ° C to the melting point of the resin + 60 ° C. The method for producing a resin-coated metal plate according to claim 1 or 2 , wherein the heating of the metal plate is performed by high-frequency heating. About the temperature of the resin at the time of heating the metal plate,
The method for producing a resin-coated metal sheet according to any one of claims 1 to 3 , wherein the heating is performed at a rate of 5 ° C / second or more in a crystallization temperature region of the resin. The method for producing a resin-coated metal plate according to claim 1 , wherein the tin plating layer has a tin plating amount of 0.5 to 13 g / m ² . The silane coupling agent is a water-soluble amino silane coupling agent,
The method for producing a resin-coated metal sheet according to any one of claims 1 to 5, wherein the Si deposition amount is 0.5 to 30 mg / ^{m 2.}

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