WO1997032715A1 - Method and device for manufacturing resin-coated metal plates - Google Patents

Abstract

A method and device for manufacturing resin-coated metal plates with good economy and yield without wasting any resin and metal plates. Since this object is achieved through two economic effects obtained by saving a process by effecting film forming and laminating a film so formed onto a metal plate in the same process and by restraining the waste of materials such as resin and metal plates as much as possible, a set resin film extruded from a T-die is not laminated onto a metal plate until the thickness of the set resin film becomes stable. In other words, the set resin film is first taken up, and it is not until the film thickness becomes stable that the set resin film is laminated onto the surface of a heated metal plate. This method can prevent the generation of defective resin-coated metal plates having a set resin film with non-uniform thickness laminated thereon, improve the yield of the resin-coated metal plates, and reduce the waste of materials. In addition, the set resin film that is kept taken up until its thickness becomes stable can be recycled when it is re-fused, and this can further reduce the loss of material (resin).

Description

 TECHNICAL FIELD The present invention relates to a method of manufacturing a solidified resin film and a metal plate of the formed film without waste of the metal plate and the resin and in the same process. TECHNICAL FIELD The present invention relates to a method and an apparatus for manufacturing a resin-coated metal plate which is capable of stably laminating a resin sheet and has excellent economic efficiency. Background art

 As a method for producing a resin-coated metal plate, Japanese Patent Application Laid-Open No. H2-24-2737 describes a method in which a thermoplastic resin melted from a T-die is flowed down onto a pre-heated metal plate, and pressed with a nipple roll to form a resin. A manufacturing method for obtaining a coated metal plate has been proposed.

 In addition, Japanese Patent Application Laid-Open No. Hei 4-291442 discloses that the molten thermoplastic resin extruded from the T-die has an unusually thick film at both ends in the width direction, so that the molten thermoplastic resin wider than the steel sheet By coating the resin on the steel sheet and providing a solid thermoplastic resin wider than the molten thermoplastic resin on the opposite side of the coated surface, adhesion of the molten thermoplastic resin to the pressing roll on the steel sheet winding side can be prevented. And a method for obtaining a double-sided resin-coated steel sheet having a uniform film thickness distribution is proposed.

Furthermore, Japanese Patent Application Laid-Open No. Hei 6-350024 discloses that the resin before coating is stretched not only in the length direction but also in the width direction, that is, by biaxially stretching. Although a method for producing a resin-coated metal plate capable of preventing the film thickness from fluctuating in the width direction of the film has been proposed, this method is certainly an effective method, but it requires a great deal of cost for biaxial stretching equipment. What is required is that the resin composition that can be biaxially stretched is practically limited, and the thickness of the resin during transverse stretching is reduced in order to reduce the thickness of the film at the end of the film with the aim of suppressing resin loss. If the film is made thinner or the grip is narrower, the film will be more likely to break, and even if biaxial stretching can be performed, the film thickness distribution will not be stable from the start of film formation and it will take some time, and even during instability Loss of resin due to lamination on metal plate Not only that, but also metal loss, and depending on the situation and production lot, it is not necessarily an economical manufacturing method, and there is a need for improvement. Also, even if the film is not stretched, the target film thickness and film thickness distribution may take a little longer than the biaxial stretching even if the film is not stretched. Until the resin film of the present invention described later is stabilized, the film is wound on a film winding machine without laminating on a metal plate, and if the wound film is reused, unstable film formation will occur. It has been found that the resin loss during the process can be almost completely eliminated. Therefore, it can be said that at least the method disclosed in Japanese Patent Application Laid-Open No. Hei 6-350024 is not an optimal production method from the viewpoint of economy.

 All of the above-described methods for producing a resin-coated metal plate have the following problems to be solved. In other words, in most of these production methods, the resin extruded from the T-die coats the molten resin on the metal plate between the cooling roll and the nipple roll.一定 It takes a certain amount of time for the thickness of the resin film to stabilize. Therefore, the resin-coated metal plate manufactured until the film thickness becomes stable cannot be used as a defective product, and the metal plate and resin during that time are wasted. Further, in the case of laminating by biaxial stretching as described above, in addition to the waste of the metal plate and the resin as described above, applicable resins are greatly limited, and the film forming stability is lacking. There was a problem.

 The present invention has been made in view of such a problem, and provides a method and an apparatus capable of economically producing a resin-coated metal plate at a high yield without wasting the metal plate and the resin. It is. Disclosure of the invention

In the method for producing a resin-coated metal plate of the present invention, the thickness of a solidified resin film formed by passing a molten resin flowing down from a T-die through a film-forming cooling roll to form a film is reduced. The solidified resin film is wound around a solidified resin film winding device until it is confirmed that the thickness is within the thickness range, and after confirming that the thickness of the solidified resin film is within the target thickness range, the metal plate is formed. The solidified resin film is continuously rewound from a rewind reel, and the solidified resin film is pressure-bonded to the surface of the heated metal plate by a laminating roll. It is characterized by continuous lamination.

 Further, a film cutting device is provided between the solidified resin film winding device and the laminating roll, and almost synchronously with the case where the solidified resin film is pressed on the surface of the heated metal plate with the laminating hole, If the cut resin film is cut at an appropriate position where the cut film is not wound around a roll or other device, lamination can be performed more easily.

 Further, the solidified resin film obtained by the above means may be laminated on only one side of the metal plate, and the solidified resin film forming and winding device described above is provided on both sides of the metal plate. The solidified resin film may be laminated on both sides of the metal plate by any suitable means. In this case, the resin composition or the coating composition of the solidified resin films to be laminated on both sides may be different from each other, or may be the same, and should be determined according to the required characteristics.

 Further, on one side of the metal plate, the solidified resin film formed by passing the molten resin flowing down from the T-die through a film forming cooling roll was rewound on the other side from a pre-made resin film rewinding roll. A ready-made resin film may be pressed simultaneously using a pair of laminating rolls provided via a metal plate, and the resin film may be laminated on both sides. Further, for the purpose of improving the film strength and the film forming speed, after the molten resin flowing down from the T die is passed through a film forming cooling roll, the solidified resin film formed is uniaxially stretched. It is also possible to continuously laminate the film by pressing the film on a heated metal plate with a laminating roll, increasing the productivity of the resin-coated metal plate and increasing the film strength in the longitudinal direction, and controlling the tension during lamination. It can be said that this is one of the preferable methods from the viewpoint that the lamination property is improved and the laminating property is improved.

Examples of the apparatus for manufacturing such a resin-coated metal sheet include a metal sheet rewinding apparatus for continuously rewinding a metal sheet, a heating apparatus for heating the metal sheet, and an extruder for flowing molten resin from a T-die. A film forming cooling roll for forming a solidified resin film from the molten resin flowing down from the T-die; and a solidified resin film winding for winding the solidified resin film until the solidified resin film falls within a target film thickness range. The solidified resin film after the solidified resin film falls within a target thickness range. A pair of laminating rolls installed via a metal plate for pressing the heated resin plate onto the heated metal plate; a cooling device for cooling the resin-coated metal plate on which the solidified resin film is continuously laminated; A resin-coated metal plate winding device for continuously winding the resin-coated metal plate. The laminating rolls are usually used as a pair as described above. However, when laminating is performed separately on each side, the above-described pair is used when another resin layer is laminated on the laminated resin layer. Lamination may be performed using two or more of the lamination ports as required.

 Next, the film formation and lamination of the solidified resin film are all performed in the same process, and an extruder, a T die, a film forming cooling roll, A resin coating device consisting of a solidified resin film winding device and a pair of laminating rolls installed via a metal plate is installed not only on one side of the metal plate but also on each side of the metal plate. Installation is required. However, it is not always necessary to separately install the pair of laminating rolls for both sides, and the solidified resin films on both sides may be simultaneously laminated by one pair of laminating ports.

 In addition, lamination of a solidified resin film formed by passing a molten resin flowing down from a T-die to one side of a metal plate through a film forming cooling hole and lamination of an already-made resin film on the other side are performed in the same process. To perform, one side of the metal plate is the extruder, T die, film forming cooling roll, solidified resin film winding device, and a pair of laminating rolls installed via the metal plate. It is necessary to install at least a ready-made resin film rewinding device for rewinding a ready-made resin film on the other side. If necessary, another pair of laminating rolls may be provided via a metal plate if necessary on the other side, but it is not always necessary to provide them as described above. It is preferable that the above-described solidified resin film rewinding device and the already-made resin film rewinding device have not only a function of rewinding a film but also a function of controlling a film tension when laminating a metal plate. .

Further, when a film cutting device is installed between the laminating roll and the solidified resin film winding device in addition to the above-described device to be installed, the solidified resin film is put into a pair of laminations. It is possible to cut the film on the non-laminated side, that is, the film between the laminating roll and the solidified resin film, at a desired position that does not wind around various rolls or other devices almost in synchronism with the pressing by the mineral roll. preferable.

 Further, installing a uniaxial stretching device between the film forming cooling roll and the laminating roll also increases the film forming speed, increases the productivity of the resin-coated metal plate, and increases the longitudinal film strength, as described above. It is preferable from the viewpoint that tension control during lamination is facilitated and lamination stability is improved. BRIEF DESCRIPTION OF THE FIGURES

 FIG. 1 is an explanatory view showing an example of a manufacturing apparatus used to carry out the method for manufacturing a resin metal plate according to the present invention. FIG. 2 is an explanatory diagram showing an example of a uniaxial stretching apparatus that can be suitably used in the manufacturing method. BEST MODE FOR CARRYING OUT THE INVENTION

 In the manufacturing method according to claims 1 to 6, the extruder, the T die, and the film forming The trimming of both ends as necessary until the thickness of the solidified resin film formed using the cooling roll reaches the target thickness, The film is wound on a solidified resin film winding device. Next, similarly, if necessary, both ends were trimmed, and after confirming that the thickness of the solidified resin film had reached a target thickness, the film was continuously unwound from a metal plate unwinder and heated. The solidified resin film is pressed against the metal plate with a laminating roll and continuously laminated to obtain a resin-coated metal plate.

 In the production method according to claim 2, a film cutting device is provided between the solidified resin film winding device and the laminator roll, and almost synchronously with lamination of the solidified resin film to the metal plate, Cut the solidified resin film at an appropriate position so that the cut solidified resin film does not wrap around rolls or other equipment or adhere to the resin-coated metal plate.

The manufacturing method according to claim 3, wherein the solidified resin film formed by using an extruder, a T-die, and a film forming cooling roll is laminated on only one surface of the metal plate, and a resin-coated metal plate of one-side resin coating is formed. obtain. In the manufacturing method according to claim 4, the solidified resin film formed by using an extruder, a T die, and a film forming cooling roll is formed on both sides of the metal plate, and each of the solidified resin films is formed. Laminated on both sides of the heated metal plate to obtain a resin-coated metal plate with double-sided resin coating.

 In the manufacturing method according to claim 5, the resin coating on one side of the double-sided resin-coated resin-coated metal plate is performed by a solidified resin film formed by using an extruder, a T-die, and a film forming cooling roll, Resin coating is performed with a ready-made resin film.

 In the manufacturing method according to claim 6, the resin coating on at least one side of the metal plate is made of a solidified resin film formed by using an extruder, a T-die and a film forming cooling roll, and further uniaxially stretched. Do.

 Claims 7 to 12 are apparatuses for carrying out the manufacturing method of claims 1 to 6, respectively.

 In the manufacturing apparatus for a resin-coated metal sheet according to claim 7, the metal sheet is continuously unwound from a metal sheet rewinding apparatus and heated by a heating apparatus, while flowing down from a T-die using an extruder. The molten resin is turned into a solidified resin film by a film forming cooling roll, and is wound around a solidified resin film winding device until it is confirmed that the solidified resin film has a desired thickness. Then, after confirming that the solidified resin film has the desired thickness, the solidified resin film is pressed on a heated metal plate by a laminating roll to continuously laminate the laminated metal plate. The apparatus is provided with equipment for winding the resin-coated metal plate cooled by the cooling device with a resin-coated metal plate winding device.

The production apparatus according to claim 8, after confirming that the thickness of the solidified resin film formed by the film-forming cooling roll in the same facility as in claim 7 has reached the target thickness, Almost synchronously with the pressing with the laminating roll, the solidified resin film is cut at an appropriate position between the solidified resin film and the laminating roll as described above, and the cut solidified resin film is wound around a roll or a device, The supply of the solidified resin film to the solidified resin film winding device is stopped so that the solidified resin film does not adhere to the resin-coated metal plate, and the solidified resin film is heated in the same manner as in claim 7. It is provided with equipment for continuously laminating a metal plate.

 The manufacturing apparatus according to claim 9, wherein the metal coating is performed by a resin coating device disposed on one side of the metal plate and configured by an extruder, a T-die, a film forming cooling roll, a solidified resin film winding device, and a laminating roll. An apparatus for continuously laminating a solidified resin film on only one side of the plate in the same manner as in claim 7 or 8 is provided. The production apparatus according to claim 10, wherein the resin coating apparatus is arranged on both sides of the metal plate, and includes an extruder, a T die, a film forming cooling roll, a solidified resin film winding device, and a laminating roll. A facility for continuously laminating a solidified resin film on both sides of a heated metal plate in the same manner as in claim 7 or 8 is provided. The laminating roll may be a single pair of laminating rolls via a metal plate as described above.

 In the manufacturing apparatus according to claim 11, the molten resin that has flowed down from the T-die is formed into a solidified resin film by a film forming cooling roll on one side of a metal plate using an extruder, and the solidified resin film is formed. Laminating is performed in the same manner as in claim 7 or 8, and a facility for laminating a ready-made resin film is provided by providing a ready-made resin film rewinding device on the other side of the metal plate.

 The production apparatus according to claim 12, wherein the solidified resin film formed by the film-forming cooling roll in the same equipment as in claim 7 is stretched in one direction (longitudinal direction) by a uniaxial stretching device. After confirming that the thickness of the film has reached the target thickness, a facility for continuously laminating the solidified resin film to the heated metal plate is provided in the same manner as in claims 7 to 11.

 (Example)

 Hereinafter, the present invention will be specifically described with reference to an embodiment shown in the accompanying drawings.

First, a configuration of a manufacturing apparatus for a resin-coated metal plate according to an embodiment of the present invention will be described with reference to FIGS. Fig. 1 conceptually shows the overall configuration of the manufacturing equipment for resin-coated metal sheets. As shown in the figure, the apparatus for manufacturing a resin-coated metal plate generally includes a metal plate transfer path, a solidified resin film film / transfer path disposed above (front) the metal plate transfer path, and a bottom (back). ) And a resin film transfer path and a resin film crimping device. As shown in Fig. 1, the metal plate transfer path heats the metal plate rewind reel 11 as a metal plate rewinding device that continuously rewinds the metal plate 10 and the metal plate 10 that has been rewound. Heating equipment 12 and upper (front) and lower (rear) laminating rolls 25 and 31 to be described later press the solidified resin film 13 and the ready-made resin film 14 on both sides of the metal plate respectively. It comprises a cooling device 16 for cooling the resin-coated metal plate 15 continuously laminated, and a resin-coated metal plate winding device 17 for winding the cooled resin-coated metal plate 15. Also, depending on the situation, if the roll is set before cooling after lamination, the appearance of the surface may be impaired, and the cooling of the resin-coated metal plate is installed before the roll as shown in the illustration, if necessary. The cooling device 33 may be used together, or the cooling device 33 alone may be used.

 In addition, although not shown, the solidified resin film forming / transfer path disposed above (in front of) the metal plate transfer path is an extruder that causes the molten resin to flow down from the T-die, and the molten resin flows down. T-die 18, film-forming cooling rolls 19, 20 for cooling and solidifying by passing the molten resin flowing down to form solidified resin film 13, and resin film 13 in the longitudinal direction The uniaxial stretching device 21 for stretching, the uniaxial stretching device 21, and the film transfer direction conversion rolls 22, 23 for changing the support and transfer direction of the resin film 13, and the solidified resin film 13 are disposed after the uniaxial stretching device 21. Solidified resin film winding up device 24, solidified resin film winding device 24, and film transfer direction changing roll

The upper (table) laminating roll 25 and the lower (rear) laminating roll 31 and the upper laminating roll 2 which are disposed between 22 and 23 and press the solidified resin film 13 against the surface of the metal plate 10 5 (Table) and the solidified resin film take-up device 24, and the solidified resin film cut with a film cutter 26 such as a knife cutter or a laser cutter for cutting the solidified resin film 13 It consists of a film cutting device equipped with pinch rolls 34, 35, 36, 37 to prevent it from wrapping around rolls or other devices or sticking to coated metal plates. Here, pinch rolls 3 4, 3 5, 3 6,

Although 37 is used, it is not always necessary to use it depending on the situation, and a device having the same function as the pinch roll may be used instead.

On the other hand, as shown in Fig. 1, the ready-made resin film transfer path arranged on the lower (back) side continuously rewinds the ready-made resin film 14 and turns it toward the lower (back) surface of the metal plate 10. hand It comprises a pre-made resin film rewinding device 27 for transferring, and film transfer direction changing rolls 28, 29 for changing the transfer direction of the resin film 14.

 Further, the resin film crimping device is composed of a pair of laminating rolls, that is, a laminating roll 25 and a laminating roll 31. It has the function of simultaneously bonding the lower (back) ready-made resin film to the metal plate and continuously laminating it. Further, the film transfer direction changing rolls 22 and 23 or 28 and 29 need not necessarily be pressed against each other via the film. Further, the above-described manufacturing apparatus merely shows a basic example of the present invention, and further increases the number of film forming cooling rolls, transfer direction changing rolls, a pair of laminating rolls, and a film static eliminator. And equipment such as a corona discharge treatment device. In addition, pass line rolls for film and metal sheets should be installed as necessary. Furthermore, although not shown, the temperature of the laminating roll as well as the temperature of the heated metal plate greatly affects the properties of the laminating resin-coated metal plate. It is preferable to provide a laminating roll surface temperature adjusting roll that makes the roll contact with the laminating roll and rotates in synchronization with the rotation of the laminating roll.

 Next, a method of manufacturing a resin-coated metal plate using the apparatus for manufacturing a resin-coated metal plate having the above-described configuration will be described.

The metal plate 10 is unwound from the metal plate rewind reel 11 and the metal plate 10 is heated, and the fusion temperature of the solidified resin film 13 and the ready-made resin film 14 is heated by the heating device 12 Τ ι ~ Τ, + 15 Heat to 0. The fusing temperature refers to the lowest temperature at which the resin film does not peel off on a flat plate after being thermally fused by being pressed on a heating metal plate by a laminating roll. The melting onset temperature is one measure. If the metal plate 10 is heated to an excessively high temperature, the contacted resin is thermally decomposed, which is not preferable. In the same step as the metal plate heating step, a film forming cooling roll 19, 2 having a cooling and solidifying function in which the resin melted from the die 18 is rotated at a predetermined speed VI by an extruder (not shown). The solidified resin film 13 obtained by flowing down to 0 and cooling and solidifying is trimmed at both ends as necessary, and then is axially stretched by a uniaxial stretching device 21. It is stretched and wound on a solidified resin film winding device 24. Further, the film forming cooling hole 20 is generally not particularly required when a thin resin film is formed regardless of whether the film is uniaxially stretched.

 Thereafter, the thickness of the wound solidified resin film 13 is good, and the film thickness is within a range that is the same as or slightly larger than the width of the metal plate 10 to be coated, or finally a width that can satisfy the product width. Confirm that the distribution is within the target soil thickness of 15% and within ± 6.

 On the other hand, in the same step as the metal plate heating step, the ready-made resin film 14 is rewound from the ready-made resin film rewinding device 27.

 As described above, after confirming that the thickness distribution of the solidified resin film 13 was within ± 15% of the target film thickness and within 6 m of the target film thickness, the solidified resin film 13 had a constant surface temperature. The upper (front) laminating roll 25 is lowered in the direction of the arrow as shown, and the lower (back) laminating roll 31 is raised in the direction of the arrow, so that the solidified resin film 13 and the ready-made resin film 14 are removed. The above-mentioned resin film fusing temperature ~ T, +15 When pressed against both surfaces of the metal plate 10 heated to +150, almost immediately, immediately, the solidified resin film winding device 24 and the upper (table) laminating roll Cut the resin film 13 between 25 as much as possible (Table). At the same time, cut the pinch rolls 34 and 35 and pinch rolls 36 and 3 Pressed through, solidified resin film winding Ri stops the winding by the apparatus 2 4. The ready-made resin film pressure supporting rolls 30 and 32 installed after the laminating roll 31 are devices for pressing and supporting the ready-made resin film before lamination, and are used when the ready-made resin film is pressed by the laminating roll. Almost synchronously, the pressure support rolls 30 and 32 have a function of opening and are preferably provided, but are not necessarily required depending on the situation.

 Further, the metal plates on which the solidified resin film 13 and the already-prepared resin film 14 are simultaneously and continuously laminated are cooled by the cooling devices 33 and 16 so that the resin-coated metal plate 15 is wound around the resin-coated metal plate. It is equipped with equipment for winding and manufacturing with a take-up device.

Thus, the film thickness of the solidified resin film 13 extruded from the T die 18 After confirming that the film thickness of the solidified resin film 13 has become stable to the target thickness without pressing the solidified resin film metal plate 10 until 1-is stabilized, the laminator roll ₂₅ Since the resin film 13 is laminated on the surface of the metal plate 10 heated to 31 and 31, the solidified resin film 13 which is not of the desired thickness is laminated to generate defective products. Can be prevented, and the yield of the resin-coated metal plate 15 can be increased. In addition, the solidified resin film 13 extruded from the T die 18 until the target thickness is reached is not yet coated on the metal plate, so that it can be recycled by re-melting, and as a result, Almost no loss of resin associated with film formation.

 FIG. 2 shows an embodiment of the configuration of a uniaxial stretching apparatus that can be suitably used in the above-described method of manufacturing a resin-coated metal sheet. As shown in the figure, the uniaxial stretching apparatus The preheating section for setting an appropriate stretching temperature, the stretching section for uniaxially stretching the preheated solidified resin film depending on the peripheral speed of the roll, and the annealing section for removing the distortion of the stretched solidified resin film are roughly divided into three parts. . In detail, the solidified resin film 13 is set to a glass transition temperature Tg to Tg + 7o in the preheating section of the uniaxial stretching apparatus, and usually 1.5 to 6 times the original length before stretching in the stretching section. Uniaxially stretch to length. Thereafter, if necessary, the film is heat-set at the annealing portion at a temperature usually higher than the stretching temperature and within a temperature range in which the appearance of the solidified resin film can be normally maintained. In addition, the uniaxial stretching ratio is determined in consideration of the stretching ratio and the ratio capable of favorably exhibiting the properties including the film thickness distribution and the surface appearance depending on the constituent resin composition of the solidified resin film. In the method for producing a resin-coated metal plate according to the present invention, the following modifications are conceivable.

 (1) Measure the rotation speed and stretching ratio of the film formation cooling roll, and control the lamination speed manually or automatically.

 (2) In the case of non-stretching without using a uniaxial stretching device, the laminating speed before winding is assumed to be VI to 1.2 XV.

 (3) In the case of axial stretching, the laminating speed is V, X stretching ratio (K) to 1.2 XV, XK.

固 Trim the solidified resin film 13 before coating to adjust it to the desired thickness distribution. A film having a width in the range of 100% to 120% of the width of the metal plate 10 to be laid and laminated. At this time, it is preferable that the trimming width at each end is within 15% of the width of the metal plate to be laminated, and 15 cm or less.

 樹脂 Without trimming the solidified resin film 13 before coating, a resin film 13 wider than the metal plate 10 to be coated is laminated on the metal plate 10 with a good film thickness distribution. Laminate and trim the resin film 13 after lamination. At this time, the portion within the thickness range of 15% of the target thickness soil and within ± 6 m is laminated on the metal plate 10.

 ⑥ Preferably, the width of the solidified resin film 13 immediately before lamination on the metal plate 10 having the target film thickness distribution is equal to the width of the metal plate 10 if film trimming is not performed.

The range is 100% to 130%.

 ト リ Trimming of the solidified resin film 13 is performed after lamination on the metal plate 10.

 The type of resin used in the present invention is not particularly limited, except for uniaxial stretching, as long as it can be extruded into a film and can be thermally fused to a metal plate, and is selected according to required characteristics. Should. In addition, when the stretching ratio is taken into consideration in the case of uniaxial stretching and in the case of biaxial stretching, the resin composition which can be widely applied is broadly limited, and there are few types of resins. Examples of the resin film configuration that can be used in the present invention include:

(1) Low density polyethylene resin,

 ②Modified olefin resin such as maleic acid-modified polypropylene,

③ Polyethylene terephthalate resin or blend resin of polyethylene terephthalate / isophthalate copolymer resin and polycarbonate resin,

 ブ レ ン ド Blend resin of polyethylene terephthalate resin or polyethylene terephthalate Z isophthalate copolymer resin and poly 4-methyl-1 pentene resin,

④ In addition to the above ③ or 、, use polybutylene terephthalate resin 樹脂 resin blended resin ⑥ ⑥ Use two extruders and dies such as multi-manifold dies

(2) Multi-layer resin composed of two layers of polypropylene resin laminated on the upper layer. (2) Polyethylene terephthalate resin or ③, ホ ー ル ド or ⑤ is further added to the upper layer of A multi-layer resin consisting of a two-layer film composed of a laminated polyethylene terephthalate / isophthalate copolymer resin, 三 Using the three extruders and a die such as a multi-manifold die, in order to obtain strong adhesion, the lowermost layer of the above ①, the blended resin composition of the above ③, ④ or ⑤, metal, etc. Excludes polycarbonate resin or poly (4-methyl-1-pentene) resin having a tendency to lower the adhesion to the plate. Examples include a multilayer resin having a three-layer coating structure in which a resin having a small addition amount is laminated.

 In addition, the resin coating may contain additives such as pigments, stabilizers, and antibacterial materials, if necessary, in each of the single layer or the multiple layers.

 On the other hand, although there is no particular limitation on the metal plate, examples of the metal plate used in the present invention include surface cleaning treatment such as surface alumite treatment, degreasing pickling, surface etching treatment, and surface immersion chromic acid treatment. And an aluminum plate which has been subjected to electrolytic chromic acid treatment, or a steel plate which has been subjected to plating treatment such as untreated, Sn, Ni, Zn, etc., and then subjected to immersion chromic acid treatment or electrolytic chromic acid treatment.

Industrial applicability

 In the method for producing a resin-coated metal sheet according to claims 1 to 6, the molten resin is extruded from a T-die, and pressed on the metal sheet until the thickness of the solidified resin film formed by the film forming cooling roll is stabilized. First, when it was confirmed that the thickness of the solidified resin film was stable and within the target thickness range, the solidified resin film was first laminated on the surface of the metal plate using a laminating roll. However, it is possible to prevent the occurrence of defective products by laminating the solidified resin film 13 that does not satisfy the target thickness, and to increase the yield of the resin-coated metal plate 15. In addition, the solidified resin film 13 extruded from the T die 18 until the target thickness is reached is not yet coated on the metal plate, so that it can be recycled by re-melting, and as a result, Can almost eliminate the loss of resin related to film formation.

 3. The manufacturing method according to claim 2, wherein a film cutting device is provided between the solidified resin film take-up device and the laminating roll, and the solidification is performed substantially in synchronization with lamination of the resin film to the metal plate. Since the resin film was cut, the solidified resin film was pressed by a laminator roll onto a heated metal plate.

— Rolls, equipment and coated gold on the solidified resin film Separation can be easily performed at an appropriate position that does not adhere to the metal plate.

 In the manufacturing method according to the third aspect, in particular, the formation of the solidified resin film and the lamination on one side of the metal plate can be performed in the same step, and the loss of the resin and the metal plate can be minimized. A single-side resin-coated metal plate can be economically manufactured. In the production method according to claim 4, in particular, the formation of a solidified resin film for double-sided lamination of the metal plate and the lamination on both surfaces of the metal plate are performed in the same step, and the loss of the resin and the metal plate is minimized. Therefore, a double-sided resin-coated metal plate can be manufactured economically.

 In the manufacturing method according to claim 5, the composition of the solidified resin film to be laminated on one side of the metal plate is constant, and the resin composition of the film to be laminated on the other side needs to be variously changed. A double-sided resin-coated metal plate that requires small lot handling due to specification changes can be manufactured easily and consequently economically.

 In the manufacturing method according to claim 6, it is possible not only to carry out the film formation of the solidified resin film and the lamination on the surface of the metal plate in the same process, but also to minimize the loss of the resin and the metal plate. Since the solidified resin film is uniaxially stretched before lamination in the same step, the film strength is higher than when an unstretched solidified resin film is laminated on a metal plate, and the film tension is easily controlled. If the productivity is further improved, the film formation speed is also increased, so that the productivity is improved and a resin-coated metal plate having economical efficiency is easily manufactured.

 Claim? References 12 to 12 denote apparatuses for enabling the production method according to claims 1 to 6 to achieve the above-described effects. That is, claims 7, 8, 9, 10, 10, 11, and 12 enable the implementation of claims 1, 2, 3, 4, 5, and 6, respectively, and implement the above-described effects by implementing the claims. It is a manufacturing device for obtaining.

 As described above, the apparatus and the manufacturing method of the present invention can provide a resin-coated metal plate having high economic efficiency which cannot be achieved by the conventional technology, and the application effect is great.

Claims

The scope of the claims 1. Use an extruder to check that the thickness of the solidified resin film formed by passing the molten resin flowing down from the T-die through a film-forming cooling roll is within the target film thickness range. The solidified resin film is taken up by a solidified resin film take-up device until the solidified resin film has reached a thickness within the above-mentioned target thickness range. A method for producing a resin-coated metal plate, comprising continuously pressing the surface of a metal plate that has been rewound and heated to a predetermined temperature using a laminating roll and continuously laminating. 2. A film cutting device is provided between the solidified resin film winding device and the laminating roll, and cuts at an appropriate position almost in synchronization with lamination of the solidified resin film on a metal plate. A method for producing a resin-coated metal sheet according to the above.  3. The resin coating according to claim 1 or 2, wherein the solidified resin film is pressure-bonded to only one surface of the metal plate using the laminating roll to produce a resin-coated metal plate having only one surface laminated with the solidified resin film. Manufacturing method of metal plate.  4. The solidified resin film is formed on both sides of the metal plate, and each of the solidified resin films is pressed on both sides of the heated metal plate using a laminating roll, and the solidified resin films are formed on both surfaces. 3. The method for producing a resin-coated metal plate according to claim 1, wherein the method comprises producing a resin-coated metal plate laminated with: 5. On one surface of the metal plate, not the solidified resin film formed by passing the molten resin from the die through a film-forming cooling roll, but the ready-made resin unwound from a pre-made resin film rewind roll The method for producing a resin-coated metal plate according to claim 1, wherein the film is pressure-bonded using the laminating roll to produce a resin-coated metal plate on both surfaces of which a resin film is laminated. 6. The method for producing a resin-coated metal sheet according to any one of claims 1 to 5, wherein the solidified resin film is uniaxially stretched and then laminated. 7. A metal plate rewinding device that continuously rewinds a metal plate, a heating device that heats the metal plate, an extruder that causes the molten resin to flow down from a die, and a film formation of a solidified resin film from the molten resin. And a solidified resin film. A solidified resin film winding device that winds the solidified resin film until the solidified resin film falls within a target film thickness range. A laminating roll for pressing a metal plate heated to a predetermined temperature by a heating device; and a resin-coated metal plate for continuously winding a resin-coated metal plate manufactured by pressing a solidified resin film onto the metal plate. An apparatus for manufacturing a resin-coated metal plate, comprising: an apparatus;  8. The apparatus for manufacturing a resin-coated metal plate according to claim 7, wherein a film cutting device is provided between the laminating roll and the solidified resin film winding device. 9. The extruder, the T-die, the film forming cooling roll, and the solidified resin film winding device are installed only on one side of the metal plate. An apparatus for manufacturing the resin-coated metal sheet according to the above.  10. The method according to claim 7, wherein the extruder, the T-die, the film forming cooling roll, and the solidified resin film winding device are respectively installed on both sides of the metal plate. An apparatus for producing a resin-coated metal sheet according to the above.  11. One side of the metal plate is not provided with the extruder, the T-die and the film forming cooling roll, and the solidified resin film winding device, but is provided with a ready-made resin film rewinding device. 9. The apparatus for producing a resin-coated metal sheet according to any one of 7 or 8.  12. A uniaxial stretching device is provided between the film forming cooling roll and the laminating roll. 13. The apparatus for producing a resin-coated metal sheet according to any one of to 11.