JPH10151701A - Resin coated metal panel, its production, resin coated can body using resin coated metal panel, and resin coated can - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin coated metal panel having good dimensional accuracy in high yield, a method for producing the same and a resin coated can body using the resin coated metal panel. SOLUTION: One end of a resin film 12 is unwound from an uncoiler 11 to be allowed to run toward a metal panel 10 in the same running direction as the metal panel 10 and cut and divided by a cutter 14 to obtain a plurality of narrow films 12a-12d and the running directions of the films 12a-12d are changed by using first steering rolls 18-21 to form intervals between the side edges of the narrow films 12a-12d and the running directions of the narrow films 12a-12d are again changed by using second steering rolls 22-24 to allow the narrow films 12a-12d to run toward the metal panel 10 while holding a set interval and the narrow films 12a-12d are brought into contact with the metal plate 10 and held between a pair of laminating rolls 27, 28 to be laminated to the surface of the metal panel 10 to produce a resin coated metal panel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a welding can (food can,
A method for producing a resin-coated metal plate used for a resin-coated can body of a beverage can, an art can, an 18-liter can, etc., a resin-coated metal plate manufactured by using the method, a resin-coated can body using the same, And a resin-coated can.

[0002]

2. Description of the Related Art In recent years, a resin-coated steel sheet has been formed into a cylindrical shape.
Cans having a resin-coated can body such as a welding can are produced and sold, and several methods for producing a resin-coated steel sheet applicable to those uses have been proposed.
49 and JP-A-6-182954. In any of these manufacturing methods, a strip-shaped wide-width steel plate is formed by laminating a resin film while forming a non-laminated portion that is not laminated on the resin film in a portion having a width of several mm serving as a welding margin when forming a welding can. It is to be coated. In particular, in the method for manufacturing a resin-coated metal plate described in Japanese Patent Application Laid-Open No. 4-91949, a resin film is divided immediately before lamination on a steel plate, a portion serving as a welding margin is removed, and then lamination is performed. Manufactures steel sheets on which narrow resin films are laminated. On the other hand, in the method for producing a resin-coated metal plate described in JP-A-6-182954, a resin film is divided and laminated on a heated steel plate immediately before laminating the resin film on the steel plate. By shrinking, a steel sheet in which a plurality of narrow resin films are laminated at intervals after lamination is manufactured.

[Problems to be solved by the invention]

However, each of these production methods still has the following problems to be solved. That is, in the method for manufacturing a resin-coated metal plate described in Japanese Patent Application Laid-Open No. 4-91949, at the start of lamination of a resin film, first, a wide-width resin film is abutted against a steel plate and laminated, and then the resin immediately before lamination is laminated. Make a cut in the film with a cutter, cut the non-laminated part while running the resin film, suck off the non-laminated part cut by the suction device provided near the cutter, and laminate only the laminated part to the steel plate It is something to do. As described above, the non-laminated portion, which is a part of the wide film, must be removed as an unnecessary portion, which lowers the yield of the product. Also, at the start of lamination, the front end of the resin film unwound from the unwinder is coated over the entire surface of the steel sheet without cutting a certain length, and then the resin film is cut, so that the entire surface of the steel sheet is cut. The resin-coated portion must be removed as an unnecessary portion outside the product, which also reduces the yield of the product.

On the other hand, in the method of manufacturing a resin-coated metal plate described in Japanese Patent Application Laid-Open No. 6-182954, a resin film is divided and laminated on a heated steel plate immediately before lamination on the steel plate. Although the non-laminated portion is provided by contracting in the width direction, it is extremely difficult to keep the contracting width constant at all times. by the way,
In the field of welding cans and art cans for the purpose of the present invention,
In many cases, a resin film provided with a printed layer in which the same pattern is repeated is laminated on a steel sheet, and after lamination, each pattern is cut into cut sheets of the same size to be formed into a tubular resin-coated can body. Therefore, if the resin film shrinks unevenly during lamination, it becomes impossible to cut the same size for each symbol after lamination. For this reason, the method described in JP-A-6-182954 cannot be applied to the present invention on the premise that a resin film provided with a printing layer in advance is laminated on a metal plate.

According to the present invention, a wide width resin film is cut and divided, and a non-laminated portion is formed at a high yield without providing a resin film removing portion without heat shrinking the resin film and providing a high yield. It is an object of the present invention to provide a method for producing a resin-coated metal plate for coating a metal sheet. The present invention also provides a resin-coated metal plate manufactured by using the above-described method for manufacturing a resin-coated metal plate, a resin-coated can body and a can using the resin-coated metal plate, and a method for manufacturing the same. The purpose is to:

[0006]

According to a first aspect of the present invention, there is provided a method of manufacturing a resin-coated metal plate, comprising: a resin film having a narrower width on one side or both sides of a continuous wide strip-shaped metal plate; Arrange a film unwinder wound in a roll, unwind one end of the resin film from the film unwinder and run toward the metal plate and in the same running direction as the metal plate, While running the resin film, the unwind end of the resin film is cut at equal intervals in the width direction and divided into a plurality of narrow films,
The traveling direction of the plurality of narrow films cut and divided,
A gap is formed between the side edges of each of the narrow films by changing the width in a direction in which the width is increased using a plurality of first steering rolls respectively corresponding to each other, and a set gap is formed between the side edges of each of the narrow films. After that, the traveling direction of each of the narrow films is changed using a plurality of corresponding second steering rolls, and each narrow film is run toward the metal plate while maintaining the set interval. Then, each narrow film is brought into contact with the metal plate, sandwiched between a pair of laminating rolls, and laminated on the surface of the metal plate to produce a resin-coated metal plate.

According to a second aspect of the present invention, in the method for manufacturing a resin-coated metal plate according to the first aspect, printing is performed on one side as the resin film wound around the film unwinder. And a resin film having an adhesive layer provided on the print, and one side of the resin film is brought into contact with the metal plate and sandwiched between a pair of rolls, and laminated on the surface of the metal plate to form a resin coating. Manufacture metal plates.

A resin-coated metal sheet according to a third aspect of the present invention is a film-winding method in which a resin film having a width smaller than that of the metal sheet is wound on one or both sides of a continuous wide strip-shaped metal sheet. Disposing the unwinder, unwinding the resin film from the film unwinder and running in the same running direction as the metal plate and toward the metal plate, while running the resin film, The unwinding end is cut at equal intervals in the width direction to divide it into a plurality of narrow films, and the running direction of the cut and divided narrow films is set to a plurality of first steering rolls respectively corresponding to the running directions. The width is changed in the direction in which the width is increased to form an interval between the side edges of each of the narrow films, and after a set interval is formed between the side edges of each of the narrow films, the width of the narrow film is reduced. Running Countercurrent, a plurality of respectively corresponding second
The narrow film is run toward the metal plate while maintaining the set interval by changing the width of the narrow roll using the steering roll, and the narrow film is brought into contact with the metal plate and sandwiched by a pair of laminate rolls. And is laminated on the surface of the metal plate, and the metal plate is covered with the plurality of narrow films at the set interval in the width direction.

According to a fourth aspect of the present invention, there is provided the resin-coated metal sheet according to the third aspect, wherein the resin film wound around the film unwinder is printed on one surface and is printed on the one side. Using a resin film provided with an adhesive layer, one side of the resin film abuts on the metal plate and is sandwiched between a pair of rolls and laminated on the surface of the metal plate. A plurality of the narrow films are covered with the adhesive layer at the set intervals in the direction.

[0010] The resin-coated can body according to the fifth aspect is the third aspect.
Or the resin-coated metal plate described in 4 is divided into at least two or more at equal intervals at a cutting width obtained by adding a half of the set interval to each side edge of each of the narrow films in the width direction. Forming a resin-coated metal sheet, forming a resin-coated metal sheet by cutting a plurality of the resin-coated metal sheets at a length corresponding to the height of the resin-coated can body at equal intervals in the length direction. Then, the resin-coated metal sheet is formed in a tubular shape so that both side edges overlap with each other, the two side edges are joined together, and a repair coating is formed on the joint.

A resin-coated can according to a sixth aspect is manufactured by attaching and fixing a bottom plate made of a coated metal plate or a resin-coated metal plate to a lower end of the resin-coated can body according to the fifth aspect.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to an embodiment shown in the accompanying drawings. In the accompanying drawings, FIG. 1 is a front view conceptually showing a resin coating apparatus used in the method of manufacturing a resin-coated metal plate according to the present invention, FIG. 2 is a plan view of the same, FIG. FIG. 4 is a schematic plan view showing a part of the resin-coated metal plate according to the present invention, and FIGS. 5 to 10 show steps of a method of manufacturing the resin-coated can body and the resin-coated can according to the present invention. 6 is a plan view showing a cutting step, FIG. 6 is a perspective view showing a joining step, FIG. 7 is an enlarged sectional view of a main part thereof, FIG. 8 is a plan view showing a repairing step, FIG. FIG. 4 is a cross-sectional view showing a step of attaching and fixing a can bottom plate.

As shown in FIGS. 1 and 2, a resin coating apparatus J which can be suitably used in the method of manufacturing a resin-coated metal plate according to the present invention comprises a metal plate 10 running vertically from above to below. It is arranged on one side of. In addition, such a resin coating device J can be provided not only on one side of the metal plate 10 but also on both sides. The configuration of the resin coating apparatus J will be described with reference to FIGS. 1 and 2. An uncoiler 11 as an example of a film unwinder is provided at a position farthest from the metal plate 10. The film 12 is wound in a roll shape. Between the uncoiler 11 and the metal plate 10, in order from the uncoiler 11 side, a first guide roll 13, a plurality of cutters 14 arranged at intervals in the width direction of the resin film 12, Guide roll 15, third guide rolls 16, 17 and first steering rolls 18 to
21, the second steering rolls 22 to 25, and the fourth
Guide roll 26 is disposed. The portion of the metal plate 10 adjacent to the fourth guide roll 26 is sandwiched between a pair of laminate rolls 27 and 28.

In the above configuration, the plurality of cutters 1
4 is a resin film 1 unwound from the decoiler 11
2 is used for cutting and dividing into a plurality of narrow films 12a to 12d. The first guide roll 13 and the second guide roll 15 are used to apply tension to the resin film 12 to ensure that the cutting by the cutter 14 is performed. Third guide roll 1
Reference numerals 6 and 17 are used to sort the plurality of narrow films 12a to 12d in the vertical direction. First steering rolls 18 to 21 and second steering roll 2
Reference numerals 2 to 25 are used to change the running direction of the narrow films 12a to 12d. The pair of laminating rolls 27 and 28 are used for laminating the narrow films 12 a to 12 d on one side of the metal plate 10.

Next, a method of manufacturing a resin-coated metal plate using the above-described resin coating apparatus J will be described with reference to FIGS. As shown in FIG. 1 and FIG.
2 is unwound from an uncoiler 11 which is an example of a film unwinder, and guided to a plurality of cutters 14 via a first guide roll 13. As shown in FIGS. 2 and 3, the cutters 14 have the same width A (slightly shorter than the circumferential length of a resin-coated can 31 described later) and a plurality of cutters 14 in the width direction of the resin film 12 (in the present embodiment, 3) are provided. Then, the resin film 12 is formed by these cutters 14.
Are a plurality of strips each having a width A (4 in this embodiment).
) Is cut and divided into narrow films 12a to 12d.
When a printing layer is provided on the outer surface of the resin-coated can 31, the width of the narrow film 12 a to 12 d after the cutting and division is set.
The width A of the pattern is the same as the width A of the resin-coated can body 30 whose length is the same as the height D of the resin-coated can body 30 to be manufactured. Narrow film 12a for each width A corresponding to
12d is cut and divided.

The narrow films 12a to 12d cut from the resin film 12 pass through the second guide roll 15, and are provided in front of the second guide roll 15, as shown in FIGS. 3rd guide roll 16, 1
7, the running directions of the adjacent narrow films 12a to 12d are sorted up and down. That is, as shown in FIG. 2, the narrow films 12a and 12c are distributed upward, and the narrow films 12b and 12d are distributed downward.

As shown in FIG. 2, adjacent narrow-width films 12a to 12d which are vertically divided are arranged on the same projection plane by first steering rolls 18, 20 (upper) and 19, 21 (lower). The running direction is changed in the direction in which the width is widened, that is, so that a space is formed between the side edges of the adjacent narrow films 12a to 12d. The change of the running direction is specifically performed in each of the narrow films 12a to 12a.
As shown in FIG. 3, the first steering rolls 18 to 21 are moved so that d moves away from each other on the same projection plane.
In plan view, the predetermined angle _{θ 1, θ 2, θ 3} , is achieved by twisting only theta _4.

The narrow films 12a to 12d whose running directions have been changed so as to move away from each other on the same projection plane by the first steering rolls 18 to 21 are connected to the second steering rolls 22 and 24 (upward) and 23, 2
5 (below), the adjacent narrow-width films 12a to 12a to
12d is the same set interval B on the same projection plane (as shown in FIG. 4, after covering each of the narrow films 12a to 12d having the width A on the metal plate 10 with the interval B, Length (C: C = 1 / 2B +) obtained by adding a joining margin to the circumference of the resin-coated can body 30 for which the resin-coated metal plate 29 is to be manufactured.
A + 1 / 2B), and the traveling direction is changed again so as to be parallel to each other. The change of the running direction is performed by each of the narrow films 12a to 12a.
FIG. 3 so that 12d approach each other on the same projection plane.
As shown, the second predetermined angle theta ₅ on the diagram flush the steering roller _22~25, θ _6, θ _7, is achieved by twisting only theta _8. Thus, the first steering rolls 18 to 21 and the second steering roll 22 provided for each of the narrow films 12a to 12d are provided.
By adjusting the torsion angles θ _{1 to} θ _{8 of up} to 25, each of the narrow films 12 a to 12 d can run parallel to each other with the same interval B on the same projection plane.

That is, as shown in FIG. 1, the narrow films 12a to 12d, which run parallel to each other at the same interval B on the same projection plane while passing through the two upper and lower paths, By a fourth guide roll 26 provided in front of the traveling direction, the path is again made to be one path traveling on the same plane, and then heated by a pair of laminating rolls 27 and 28 (not shown). The resin-coated metal plate 29 is manufactured by being brought into contact with the heated metal plate 10, sandwiching and laminating.

Although not shown, in this embodiment,
The resin coating apparatus J arranges a plurality of position detection sensors capable of detecting the side edge positions of the narrow films 12a to 12d in a plurality of running positions of the narrow films 12a to 12d in the width direction, respectively. ing. Therefore, each of the narrow films 12a to 12a to 1 according to a signal from the position detection sensor.
The position in the width direction of 2d can be adjusted by a fine adjustment device (edge positioner) (not shown) so as to be always constant.

In this manner, the resin-coated metal plate 29 is manufactured by using the method for manufacturing a resin-coated metal plate according to the present invention. Are the first steering rolls 18-2
Since the running direction can be adjusted independently by the first and second steering rolls 22 to 25, each of the narrow films 12a to 12d after the cutting and splitting is performed.
Can be controlled equally with high dimensional accuracy. Further, the divided resin films 12a to 12d have no portions to be removed, so that the resin-coated metal plate 29 can be produced with a high yield.

As the metal plate 10, a cold-rolled steel plate, a surface-treated steel plate, or the like is used. As the surface-treated steel sheet, a tin-plated steel sheet is usually used.
Examples include chromium plating, zinc plating, and various types of plated steel sheets obtained by laminating these. However, when the resin-coated can body 30 (see FIG. 10) is formed by using a welding method, it is preferable that tin plating is present on both the front and back surfaces of the steel sheet in order to ensure good weldability. The form of the tin plating layer may be either layered or island-shaped. Further, the plating thickness may be different on both the front and back surfaces of the steel sheet.

The resin film 12 is preferably a film made of a thermoplastic resin, such as a homopolyester such as polyethylene terephthalate or polybutylene terephthalate, a copolyester such as ethylene terephthalate / isophthalate or butylene terephthalate / isophthalate, or bisphenol A. Examples thereof include films made of polycarbonate such as polycarbonate, or resins obtained by blending two or more of these. These films are unoriented, unoriented films,
Alternatively, any of uniaxially stretched and biaxially stretched oriented films can be used, but the lamination work is easy,
A biaxially oriented film is more preferable from the viewpoint of corrosion resistance after the content is filled into a can.

One side of the resin film 12 may be printed on the side that becomes the outer surface of the can after being formed into a can in order to represent the contents of the product or the image of the product. If you have printed,
In order to ensure good adhesiveness with the metal plate, it is preferable to provide an adhesive layer on the printed surface, and to heat and laminate the printed resin film and the metal plate 10 via the adhesive layer. . Also, regardless of the presence or absence of a print layer, even when the above-described heat lamination alone does not provide sufficient adhesion of the resin film 12 made of the thermoplastic resin film to the metal plate 10, the adhesive layer is interposed as described above. It is preferable that the resin film 12 and the metal plate 10 are laminated by heating.

The adhesive may be any one of an epoxy-based adhesive, a phenol-based adhesive, an epoxy / phenol-based adhesive, an amide-based adhesive, a urethane-based adhesive, an acid-modified olefin-based adhesive, and a copolyamide-based adhesive. Or an adhesive obtained by blending them.

The thickness of the resin film is generally 3 to 50 μm.
m is preferably in the range. When the thickness is less than 3 μm, the rigidity of the film becomes extremely small, and wrinkles are easily generated in the coating process shown in FIGS. 1 and 2, and the coating operation becomes extremely difficult. On the other hand, when the thickness exceeds 50 μm, it is disadvantageous in terms of cost as compared with a paint widely used in the field of can making, which is not preferable.

The resin-coated metal plate 2 constructed as described above
Reference numeral 9 is used as a material to be formed as a resin-coated can body 30 of a three-piece can represented by a welded can composed of a top plate, a bottom plate, and a three-part resin-coated can body 30 as will be described later. In the resin-coated metal plate 29 of the present invention, as shown in FIG. 4, resin non-laminated portions 34 are provided on both sides of the resin laminated portion 33 at equal intervals. At the center of each resin non-laminated portion 34, and as shown in FIG. 4, the width C (C = 1 / 2B + A + 1 /
2B), and further cut and divided the resin-coated metal strip 32 into a length corresponding to the height D of the resin-coated can body 30 to be manufactured. When the blank is formed into a tubular shape and the blank is formed into the resin-coated can body 30, the resin non-laminated portions 34 each having a width of Ｂ B on both sides of the resin laminated portion 33 are easily overlapped and joined by welding or the like. To do that. Resin laminate 33
Width A and the interval B between the resin non-laminated portions 34 are determined by the type of can,
In particular, it is determined according to the size, and the size differs depending on whether it is used for a large can such as an 18 liter can or for a beverage can having an internal capacity of about 200 ml.

Next, referring to FIGS. 3 to 7, the resin-coated resin-coated can body 30 and the resin-coated can of the present invention and a method for producing them will be described. When manufacturing, for example, a welding can from the resin-coated metal plate 29 manufactured by the above-described method for manufacturing a resin-coated metal plate, first, the wide resin-coated metal plate 29 shown in FIG. 4 has a width C shown in FIG. It is cut and divided into a plurality of resin-coated metal strips 32. Next, the resin-coated metal strip 32 is cut at a right angle to the longitudinal direction according to the height D of the resin-coated can body 30 to be manufactured. In the case where a printing layer is provided on the surface to be the outer surface of the can, the width of each of the cut and divided resin-coated metal strips 32 is the same as the width A of the cut and divided, and the length of the resin-coated can body to be manufactured is Height D
Since the same design is repeatedly covered with a narrow resin film that is repeatedly printed in the longitudinal direction, the resin-coated metal strip 32 is provided for each design length (ie, the height D of the resin-coated can body 30). Disconnect. In this way, a rectangular blank sheet 31 having a width C and a length D is obtained.

Then, the blank sheet 31 cut and cut in such a manner that the welding portion is determined in advance is overlapped so that the non-resin laminated portions 34 each having a width of ＢB face each other and overlap at a predetermined overlapping margin 35. It is formed into a cylindrical shape (see FIG. 6). Then, as shown in FIG. 7, the overlap margin (welded portion) 36 is sandwiched between welding electrodes, and welding is performed by applying a current while applying pressure. The overlapping margin 36 varies depending on the size of the can to be manufactured, but is usually 0.3 to 3.0.
It is about 0 mm.

The width (1 / 2B) of the resin non-laminated portion 34
Is determined in consideration of the size of the can and the overlapping margin 36 of the non-laminated portion. For example, in a small can such as a beverage can of about 200 ml, the width of the resin non-laminated portion 34 is about 1 to 3
mm. Instead of welding, other joining means such as a resin or a tin alloy may be employed.

Next, the entirety of the resin non-laminated portion 34 including the welded portion, that is, the resin non-laminated portion 34 on both the inner surface and the outer surface of the resin-coated can body 30 in FIG. A resin coating 39 is formed by applying a repair coating of a thermosetting resin or attaching a resin film to prevent the contents from directly contacting the metal plate 10 and secure corrosion resistance. At this time, the resin film 39 for repair is sufficiently covered so as to cover the end of the resin laminated portion 33 made of the resin film so that the base of the metal plate 10 does not remain in an exposed state (FIG. 9). The paint used for the repair may be a liquid paint or a solid powder paint as long as it is a conventionally used paint. However, a paint that can obtain high adhesion to the resin film is selected. As the repair resin film 39, a resin film that can be thermally fused with a resin film is selected.

Next, the upper and lower ends of the cylindrical resin-coated can body 30 constructed as described above are overhanged to form flanges 40 and 41. In some cases, the flanges are formed after the both ends are slightly reduced in diameter to reduce the diameter. A can bottom plate (or can lid plate, hereinafter referred to as a bottom plate) 42 shown in FIG. 10 is attached and fixed to the lower end of the resin-coated can body 30 on which the flange is formed, or to both upper and lower ends in some cases. The can bottom plate 42 is made of the resin-coated metal plate 29 of FIG. 4 or a coated metal plate having the same corrosion resistance as that of the resin-coated can body 38 in the same shape (for example, a circle) as the cross section of the resin-coated can body 38, and has a slightly larger area. The outer edge is formed so as to overlap the flange formed at the end of the resin-coated can body 30, and a ring-shaped packing is formed at the outer edge. The outer edges of both ends of the can bottom plate 42 are attached to the lower end of the resin-coated can body 30 or the flanges at both upper and lower ends thereof, and are fixed by winding with a seamer. FIG. 10 shows a case where the can bottom plate 42 is attached and fixed only to the lower end of the resin-coated can body 30.

[0033]

The present invention will be described in more detail with reference to the following examples. (Example) As shown in FIG.
m, a pattern 50 having a length of 107.9 mm is printed so as to be four juxtaposed in the width direction and continuously juxtaposed in the longitudinal direction, and an epoxy-based adhesive is further applied thereon at 646 mm in which 30 mg / m ^{2 is} applied. A long film 51 wound in a coil shape made of a biaxially stretched polyethylene terephthalate film having a thickness of 16 μm and having a width of is provided on one side of a surface-treated steel sheet having a width of 663 mm, which is continuously running, which will be described later. 1 and 2 was unwound from an uncoiler using the same apparatus as the resin coating apparatus J shown in FIG. 1 and FIG. 2, and cut into four narrow films of 161.5 mm in width using a cutter. Using the first and second steering rolls to make the distance between the narrow films equal to 4 mm,
One side of the surface-treated steel sheet heated to 250 ° C. was in contact with the surface to which the epoxy-based adhesive was applied. At this time, of the four narrow films, the side edge of the narrow film at both ends, which is located on the opposite side to the other adjacent narrow film, is 2 mm inward from the side edge of the surface-treated steel sheet. Contacted to be located at

On the other hand, using the same manufacturing apparatus as the resin coating apparatus J shown in FIGS. 1 and 2 provided on the other side of the surface-treated steel sheet, 30 mg / epoxy adhesive was applied on one side.
A long film wound in the same transparent coil shape as a biaxially stretched polyethylene terephthalate film having a width of 646 mm and a thickness of 16 μm coated with m ² was unwound from an uncoiler, and the width 161 was measured using a cutter. .5m
After dividing equally into four narrow films of m, the distance between the narrow films is made equal to 4 mm using the first and second steering rolls, and on the other side of the heated surface-treated steel sheet, The surface to which the epoxy adhesive was applied was brought into contact. At this time, of the four narrow films, the side edge of the narrow film at both ends located on the opposite side to the adjacent narrow film is 2 m from the side edge of the surface-treated steel sheet.
m in contact with each other. As above,
Immediately after the biaxially stretched polyethylene terephthalate film was brought into contact with one side and the other side of the heated surface-treated steel sheet, the two pieces were sandwiched between a pair of laminating rolls, laminated, quenched in water, and then dried. Thus, a resin-coated steel sheet in which a printed resin film and a transparent resin film were laminated at positions corresponding to the front and back of the surface-treated steel sheet was obtained.

As the surface-treated steel sheet, a sheet thickness of 0.18 m
A chromium hydrated oxide layer having an amount of 150 mg / m ² and a chromium hydrated oxide layer having an amount of 12 mg / m ² was formed on both sides of a steel plate having a width of 662 mm and a thickness of 662 mm.

As shown in FIG. 5, the resin-coated steel sheet manufactured as described above is divided into narrow resin-coated steel strips having a width of 165.7 mm and a non-laminated portion of 2 mm on both sides. This resin-coated steel strip was further cut at equal intervals every 107.9 mm corresponding to the height of a can to be manufactured at right angles to the longitudinal direction, and a blank having the same pattern printed on one side was obtained.

The blank thus obtained was rounded into a cylindrical shape having a diameter of 52.6 mm so that the surface on which the pattern was printed became the outer surface, and the non-laminated portions at both ends were welded by overlapping by 0.4 mm. However, it was possible to obtain a resin-coated can body having a good welded portion without peeling of the resin film due to welding heat. Further, a non-laminated portion including a welded portion of the obtained resin-coated can body was coated with a polyester paint to repair the welded portion. Then, a cut reaching the steel plate base was made with a knife in a 5 mm grid pattern on the repaired part, and a cellophane tape was adhered on the cut, and then the cellophane tape was rapidly peeled off, but polyester paint peeled off in a cellophane tape form was recognized. However, it was shown that the adhesiveness between the repair coating film made of the polyester paint and the polyethylene terephthalate film was good.

Both ends of the resin-coated can body obtained as described above are subjected to diameter reduction processing and further flange forming, and then one end is coated with an epoxy / phenol-based paint on both sides of the same surface-treated steel sheet as described above. The can bottom plates manufactured from the coated coated steel plates were overlapped and wound to form a can, and then filled with coffee, and the same can bottom plate as the above was used as a can lid and overlapped and tightened. The can with coffee thus obtained was sterilized by heating in high-temperature steam at 130 ° C. for 1 hour, left in a constant-temperature room at 50 ° C. for 3 months, and then opened. No corroded portion was found inside the can. No coffee spoilage or deterioration was observed.

[0039]

According to the method for producing a resin-coated metal plate and the resin-coated metal plate according to the first and third aspects, one end of the resin film is unwound from a film unwinder and is directed toward the metal plate and is the same as the metal plate. Running in the running direction, the unwinding end is cut at equal intervals in the width direction while running the resin film to divide it into a plurality of narrow films, and the running direction of the cut and divided plurality of narrow films. Is changed in the direction in which the width is increased using the corresponding plurality of first steering rolls to form a space between the side edges of each narrow film, and a set space is formed between the side edges of each narrow film. After that, the running direction of each narrow film is changed using a plurality of corresponding second steering rolls, and each narrow film is run toward a metal plate while maintaining a set interval, and each narrow film is run. Width And a Lum as laminated on the surface of the metal plate sandwiched by a pair of laminating rolls with abutting the metal plate for producing a resin-coated metal sheet. Therefore,
A wide resin film can be cut and divided without providing a resin film removal section, and can be coated on a metal plate without heat shrinkage.Therefore, the resin film is provided with non-laminated parts with high dimensional accuracy and high yield. It becomes possible to cover a metal plate. In the method for producing a resin-coated metal plate and the resin-coated metal plate according to claims 2 and 4, by coating the metal plate with a resin film on which a pattern is printed,
The resin-coated metal plate can be easily cut into blanks for each design and formed into a resin-coated can body.

In the resin-coated can body and the resin-coated can according to the fifth and sixth aspects, since the bonding strength of the metal plate is high and the adhesion between the repair coating film and the resin film at the bonding portion is excellent, Filled and sterilized at high temperature,
Even if it is allowed to age for a long time, the inside of the can is not corroded and the contents are not spoiled.

[0041]

[Brief description of the drawings]

FIG. 1 is a front view conceptually showing a resin coating apparatus used in a method of manufacturing a resin-coated metal plate according to the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is an enlarged sectional view of a main part thereof.

FIG. 4 is a schematic plan view showing a part of the resin-coated metal plate according to the present invention.

FIG. 5 is an explanatory view showing a cutting step of the method for producing a resin-coated metal sheet according to the present invention.

FIG. 6 is an explanatory view showing a welding step of the method for producing a resin-coated metal sheet according to the present invention.

FIG. 7 is an enlarged explanatory view of a main part of FIG. 6;

FIG. 8 is an explanatory view showing a repairing step of a welded portion in the method for producing a resin-coated metal sheet according to the present invention.

FIG. 9 is an enlarged explanatory view of a main part of FIG. 8;

FIG. 10 is a cross-sectional view showing a step of attaching a can bottom plate in one embodiment of the method for producing a resin-coated can body and the resin-coated can of the present invention.

FIG. 11 is a plan view showing a resin film on which a design is used, which is used in one embodiment of the method for producing a resin-coated metal plate of the present invention.

[Explanation of symbols]

A Width of the resin-laminated portion B Interval of the non-resin-laminated portion C Width obtained by adding the overlap margin to the circumference of the resin-coated can body to be manufactured D Height of the resin-coated can body to be manufactured (length of the pattern) ) J Resin coating device 10 Metal plate 11 Uncoiler 12 Resin film 12a Narrow film 12b Narrow film 12c Narrow film 12d Narrow film 14 Cutter 18 First steering roll 19 First steering roll 20 First steering roll 21 First steering roll 22 Second steering roll 23 Second steering roll 23 Second steering roll 24 Second steering roll 25 Second steering roll 27 Laminate roll 28 Laminate roll 29 Resin coated metal plate 30 Resin coated can Torso 31 blanc Tsu DOO 32 resin-coated metal strip 33 resin laminate unit 34 the resin non-laminated portion 36 superposed cash 39 resin coating 40 flange 41 flange 42 cans the bottom plate 50 design 51 elongated film

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Inazawa 1302 Higashi Toyoi, Kudamatsu City, Yamaguchi Prefecture Toyo Kohan Co., Ltd.

Claims (6)

[Claims] 1. A film unwinder in which a resin film having a width smaller than that of the metal plate is wound in a roll on one or both sides of a strip-shaped wide metal plate running continuously. While unwinding one end of the resin film from the unwinder and running in the same running direction as the metal plate toward the metal plate, while running the resin film, the unwinding end of the resin film in the width direction Cutting at the same interval and dividing into a plurality of narrow films, the running direction of the plurality of narrow films cut and divided,
A gap is formed between the side edges of each of the narrow films by changing the width in a direction in which the width is increased using a plurality of first steering rolls respectively corresponding to each other, and a set gap is formed between the side edges of each of the narrow films. After that, the traveling direction of each of the narrow films is changed using a plurality of corresponding second steering rolls, and each narrow film is run toward the metal plate while maintaining the set interval. Producing a resin-coated metal plate by abutting each narrow film on the metal plate, sandwiching the film with a pair of laminating rolls, and laminating the film on the surface of the metal plate. . 2. As the resin film wound around the film unwinder, a resin film having one side printed and an adhesive layer provided on the printing is used, and one side of the resin film is The method for manufacturing a resin-coated metal plate according to claim 1, wherein the resin-coated metal plate is manufactured by contacting the metal plate, sandwiching the pair of rolls, and laminating the metal plate on the surface of the metal plate. 3. A film unwinding machine in which a resin film having a width smaller than that of the metal plate is wound in a roll form on one side or both sides of a strip-shaped wide metal plate running continuously. Unwinding the resin film from the unwinder and running the same toward the metal plate and in the same running direction as the metal plate, while running the resin film, set the winding end of the resin film at the same interval in the width direction. , And cut into a plurality of narrow films, and the running direction of the plurality of cut narrow films is
A gap is formed between the side edges of each of the narrow films by changing the width in a direction in which the width is increased using a plurality of first steering rolls respectively corresponding to each other, and a set gap is formed between the side edges of each of the narrow films. After that, the traveling direction of each of the narrow films is changed using a plurality of corresponding second steering rolls, and each narrow film is run toward the metal plate while maintaining the set interval. The narrow plate is manufactured by abutting the narrow film on the metal plate and sandwiching the film with a pair of rolls and laminating the narrow plate on the surface of the metal plate. A resin-coated metal plate coated with the narrow film. 4. As the resin film wound around the film unwinder, a resin film that is printed on one side and provided with an adhesive layer on the print is used, and one side of the resin film is Manufactured by abutting on a metal plate and sandwiching between a pair of rolls and laminating on the surface of the metal plate, a plurality of the narrow films are provided with the adhesive layer at the set interval in the width direction of the metal plate. The resin-coated metal plate according to claim 3, which is coated via a resin. 5. The resin-coated metal plate according to claim 3 or 4, wherein at least two equal widths of the set width are added to both side edges of each of the narrow films in a width direction. A plurality of resin-coated metal sheet strips are formed by cutting into a plurality of pieces, and the plurality of resin-coated metal sheet strips are cut at equal intervals in the length direction at a length corresponding to the height of the resin-coated can body. Forming a resin-coated metal sheet, forming the resin-coated metal sheet into a tubular shape so that both side edges are overlapped, joining the two side edges together, and forming a repair coating on the joint. A resin-coated can body manufactured by the above method. 6. A resin-coated can manufactured by attaching and fixing a bottom plate made of a coated metal plate or a resin-coated metal plate to a lower end of the resin-coated can body described in claim 5.