KR19990048780A - Resin film coated metal sheet and manufacturing method thereof - Google Patents

Abstract

The present invention is excellent in designability and productivity by laminating a specially prepared resin film on a specific surface of a metal plate in order to fundamentally streamline the printing process of a 3-piece canister, The present invention relates to a method for producing a resin film-coated metal sheet from which non-environmentally friendly elements are removed.

The present invention is a method for producing a laminated metal sheet for welding pipe (3-Piece Can) by coating a resin film on one or both sides of the metal plate continuously fed, in parallel with the rolling direction of the metal plate on one side of the resin film After applying the adhesive in the shape of a strip to form an adhesive layer on the remaining portions except for the welded portion in the production of welded pipes, a perforation line is formed at each end of the coated adhesive, and the surface coated with the adhesive faces the metal plate. After laminating the resin film on one or both sides of the metal plate, the resin film of the welded part is peeled off to secure the welded part. It is a technical subject matter about the method of manufacturing this excellent resin film coating metal plate.

Description

Resin film coating metal plate and manufacturing method

The present invention relates to a method for producing a resin film-coated metal sheet for weld tubes, and more particularly, to a resin film specially manufactured on any specific surface of the metal sheet in order to fundamentally streamline the printing process of a 3-pipe can. The present invention relates to a method for producing a resin film-coated metal sheet which has excellent designability and productivity by laminating, and removes non-environmentally friendly elements generated during welding tube production.

Conventional welding method of 3-Piece Can, after surface treatment of various tin, nickel or double plating of nickel and tin on black plate, improves corrosion resistance and save In order to preserve the taste and aroma of food, it is common to apply a thermosetting paint on the inner surface of the steel sheet, and to print the label design to display the contents on the outer surface.

Since most of the paintings used on the inner surface of the pipes use thermosetting paint, a curing process is required to remove the solvent at high temperature after painting. This requires not only a high temperature curing oven, but also consumes enormous thermal energy. Huge amounts of harmful solvents are generated in the Metal printing on the outer surface of the tube for the design of the product's trademark is also carried out three to four times through the oven, similar to the painting process.

The conventional method for producing a steel sheet for welded pipes not only discharges a large amount of harmful gases to the environment, but also the coating properties thereof are not suitable for long-term storage of food, and part of the paint is dissolved into the food to change taste and aroma.

In addition, the adhesive force to the steel sheet of the thermosetting paint is weak and peeling or cracking occurs during processing also occurs that can not be used essentially as a container. Although the inner surface of the pipe is generally double coated, it is impossible to completely cover the surface of the steel sheet, and a lot of minute pinholes and cracks are generated, and thus many of the enamel rate value tests are used. Positive cans have been rejected.

In order to solve the problems of the prior art, a film is coated on a steel sheet. In particular, Japanese Laid-Open Patent Application J05-111674 discloses a technique for securing a welded portion required in a welding tube before laminating a composite resin film on a coiled steel sheet surface. In the form of a tube (circumference) corresponding to the width of the welded tube, the thermosetting organic paint is left uncoated with a thickness of 1 to 10 mm. The technique of manufacturing the composite resin coated steel plate which secured the weld part by the process of removing a solvent and thermocompressing the composite resin film which has a thermosetting adhesive bond layer is disclosed.

In addition, in Japanese Patent Application Laid-Open No. J05-147181, before laminating the composite resin film to the coil in the steel plate width direction, the thermosetting organic paint is continuously stripped in a strip shape, leaving the uncoated portion of 1 to 10 mm in the width corresponding to the pipe circumference of the weld tube. After both sides are applied to the front and back (it may not use a thermosetting organic paint), the solvent is passed through an oven to remove the solvent and thermocompression bonding the composite resin film having a thermosetting adhesive layer thereon In the present invention, there is provided a technique of forming a cut in advance on a surface corresponding to an unpainted portion immediately before lamination and removing the laminate after lamination.

However, in the technique disclosed in Japanese Patent Laid-Open Publication No. 05-111674, the use of a thermosetting epoxy resin in a coiled steel sheet continuously requires an oven-passing process for curing the paint, as in the existing steelmaking process, and discharges a large amount of organic solvent and a large amount of organic solvent. Energy is consumed.

In addition, although the technique disclosed in Japanese Patent Laid-Open Publication No. 05-147181 has already been made to form a cut to easily remove the laminated portion after welding, the operation is substantially due to the adhesive applied between the steel plate and the film of the weld portion. It is very difficult to remove the resin film of the welding part because it is very strongly bonded like the non-welding part, and it becomes complicated because the device for forming a cut is installed in the place immediately before the laminate, and thus the composite resin film to secure the welding part immediately before the lamination. The formation of cuts in the cutting edges can be found after lamination, even if defects occur in the high-speed production line, which may adversely affect cost savings. Divide by It is difficult to exactly correspond to the heat-pressing the both inside and outside surfaces of the tube film, and the binary number of problems such as that equipment costs are consuming was present in order to solve this problem.

The present invention has been made to solve the problems of the prior art described above, the manufacturing process is not only environmentally friendly, but also excellent in the preservation of taste and aroma for food, and to provide a method for producing a resin film-coated metal sheet for welding tubes that can be beautifully printed. The purpose is.

In addition, another object of the present invention is to provide a method for manufacturing a resin film coated metal plate for a welded pipe, which is easy to remove the resin film of the welded part when the resin film coated metal sheet is welded.

1 is a plan view of a resin film-coated metal sheet produced according to the present invention,

2 is a cross-sectional view taken along the line A-A of the metal plate shown in FIG.

3 is a view schematically showing an apparatus for producing a resin film-coated metal sheet of the present invention.

<Explanation of symbols for main parts of drawing>

1: overcoating layer 2: printing layer 3, 7: resin film layer 4, 6: adhesive layer

5: Metal plate 10: Welding part 11: Perforation line

In the method for producing a resin film-coated metal sheet of the present invention for achieving the above object, in a method for producing a laminated metal plate for a weld pipe (3-Piece Can) by coating the resin film on one side or both sides of the metal plate continuously supplied, On one side of the resin film, the adhesive is applied in the form of a band so as to form an adhesive layer on the remaining portion except for the welded portion in the production of the welded tube in parallel with the rolling direction of the metal plate, and then a perforation line is formed at each end to which the adhesive is applied. The resin coated surface is laminated on the end or both sides of the metal plate to face the metal plate to which the adhesive is applied, and then the resin film of the welded part is peeled off to secure the welded part.

In the present invention, the resin film is made of a low melting point adhesive layer, a resin film layer containing a white pigment, an ink printing layer displaying a trademark design, an overcoating layer, or a white pigment containing a white pigment from the metal plate side in the case of the outer surface of the tube. It consists of a melting point adhesive bond layer, the ink printing layer which shows a trademark design, a resin film layer, and an overcoating layer, and in the case of a pipe | tube inner surface, it consists of a thermosetting low melting point adhesive bond layer and a resin film layer from a metal plate side.

The invention will now be described in detail with reference to the accompanying drawings, in which preferred embodiments are shown.

As shown in FIG. 2, the resin film-coated metal sheet for a weld tube manufactured according to the present invention has a low melting point adhesive layer 4 on a metal plate 5 on the outer surface of the tube, followed by a resin film layer 3 containing a white pigment, A low-melting adhesive layer 4 consisting of an ink printing layer 2 for displaying a trademark design, an overcoating layer 1, or containing a white pigment on the metal plate 5, followed by an ink printing layer 2 for displaying a trademark design ), The resin film layer 3, and the overcoating layer 1 thereon, and on the inner surface of the tube, an adhesive layer 6 having a low melting point is formed from the metal plate 5 side, and then the transparent resin film layer 7 is formed. ) Is formed.

An important feature of the present invention, as shown in Figure 1, in the case of the low melting point adhesive layer (4, 6) used in the inner and outer surfaces, about 1 to 10 mm in the area corresponding to the tube circumference of the container to be produced in advance Preferably, it is applied leaving the welded portion 10 of 1.5 to 5 mm, and the perforated line 11 is formed between the blanks to facilitate removal after lamination. Therefore, only the resin film layer is formed in the welding part 10, without the adhesive applied.

Among the elements formed on the metal plate 5 to manufacture the tube in the present invention, the resin film layer 3 formed on the outer surface of the tube may optionally contain a white paint, the ink printing layer 2, the overcoating layer (1) It is used as a base of the adhesive bond layer 4. The gravure printing of the desired color and design is formed on the resin film layer 3 to form the ink printing layer 2 and the adhesive layer 4 in the form of leaving the welded part on the opposite side, and finally the overcoating layer 1 is formed. An adhesive layer of low melting point (in some cases, formed on the printing layer 2 or in other forms, in which the printing layer 2 is formed on the end face of the resin film layer 3 and the welds are left on the printing layer 2). 4) and finally the overcoating layer 1 on the opposite side.

In the case of the inner surface of the tube on the opposite side, the low-melting adhesive layer 6 is formed on the transparent resin film layer 7 by applying it in the form of leaving the welded portion in a positional relationship corresponding to the outer surface of the tube. Since no adhesive is applied to the weld portion, the resin film layer 7 for securing the weld portion after lamination is easy to remove.

In the present invention, in the case of the white pigment applied to the resin film layer 3 or the adhesive layer 4 formed on the outer surface of the tube, it is used at the request of the demand to increase the clarity of the trademark design, in which case the white pigment used The amount of is not fixed, but if the amount is too large or too small, it may cause the sharpness of the printed layer. Therefore, the average particle size is preferably 0.3 to 4.5 µm, and when the resin film is applied to the resin film, 20% and when applied to the low melting point adhesive layer, 2-25% of the weight of the adhesive layer is preferable.

In the case of the overcoating layer (1) is formed to prevent damage to the coating film in the high-speed pipe manufacturing line, the adhesive layer is to ensure that the composite resin film layer is laminated in advance with sufficient adhesive strength on the tube-bearing metal plate, and when After filling the contents, the resin film should have sufficient adhesive force to prevent the resin film from peeling off even during sterilization treatment (Retort treatment).

Adhesives used in the present invention include urethane, polyester, vinyl chloride, etc., but phenolic adhesives are most preferred. In particular, it is preferable to use an epoxy resin having an epoxy equivalent of 1000 to 6000. In the case where the epoxy equivalent is 1000 or less, since the epoxy resin has adhesive strength even after removing the solvent from an oven, the resin film to which the adhesive is applied is wound up in advance. May cause a problem, and when the epoxy equivalent is 6000 or more, the adhesive force drops sharply.

The adhesive described above used in the present invention has a curing agent selected from a composite such as phenol resin, urea resin, amide resin, ester resin, cyclic resin, urethane resin, and the like. The amount of this solvent is 10 to 95% of the amount of epoxy resin is suitable, less than 10% of the hardening of the adhesive is difficult to occur, and more than 95% of the epoxy resin formability is sharply reduced.

In addition, the amount of the adhesive layer applied on the resin film is 0.8 ~ 1.7g / ㎡ was found to be most suitable after the volatilization of the solvent, when applied more than that the adhesion to the metal plate and the resin film is lowered, the resin below The moldability of the drops rapidly.

Next, the resin film used in the present invention will be described. The resin film layers formed on the inner and outer surfaces of the tube are thermoplastic resin films such as polyester resin films, polypropylene resin films, nylon resin films, and polyolefins.

The resin film laminated on the inner surface of the tube mainly aims at securing corrosion resistance to the contents, and if the heat resistance is not sufficient in the oven process in the repair coating for the welded part after the welding process of the pipe, it may be locally dissolved and defects may occur in severe cases. It may be, and the corrosion resistance may worsen violently. Therefore, the film must be selected for subsequent local coating after welding.

Since the melting point of the polypropylene resin film is about 165 ° C, the oven temperature is preferably 165 ° C or lower at the time of local coating of the required welding part after welding.

In addition, in the case of polyester, by selecting an alcohol and an acid component, it is possible at high temperature up to 260 degreeC, and heat resistance can also be ensured, and applicability is extensive.

In the case of nylon film, the melting point is about 225 ℃, the oven temperature can be up to 220 ℃.

In the case of polyolefin resin and vinyl chloride resin, the mechanical properties of the resin itself are inferior, so that peeling or cracking occurs during molding processing with a large amount of deformation, and the heat resistance of the resin itself is low. In the case where the use and heat treatment are required, there is a disadvantage that it is practically difficult to use.

However, polyester resins have a wide range of use among the various resin films described above because of their excellent heat resistance, adhesion, rust resistance, and molding processability. In addition, the polyester resin exhibits better mechanical properties with a film obtained by at least uniaxial stretching, particularly preferably biaxial stretching. The stretching temperature is usually 80 to 95 ° C., but the stretching ratio is not limited, but in the case of biaxial stretching, about 1.5 to 5 times in the longitudinal direction and about 1.5 to 5 times in the transverse direction are common. If not stretched, the packaging material is extremely poor in function.

Since the self-strength of the thermoplastic polyester resin film used for the metal structure for container manufacture must have sufficient mechanical strength, the degree of polymerization of the polyester resin is measured at a relative viscosity (concentration of resin 0.5 g / ochlorochlorophenol 100 ml, measured at 25 ° C.). Should be synthesized to fall within a certain range. Generally it is 1.6-1.9. In addition, the crystallinity of the polyester resin is generally about 10 to 40% best in the rust resistance and corrosion resistance of the coated metal sheet.

The biaxially stretched copolyesters used in the present invention are generally at least 65 mole%, in particular at least 80 mole%, of the acid component and terephthalic acid, and at least 65 mole%, especially at least 80 mole%, of the alcohol component. Glycol, 5 to 35 mole%, particularly 8 to 20 mole%, of the acid component is an acid other than terephthalic acid, and 5 to 35 mole%, particularly 8 to 20 mole%, of the alcohol component is an alcohol other than ethylene glycol .

Among the acid components, non-terephthalic acid components include aromatic dicarboxylic acids, isophthalic acid, phthalic acid, naphthalene-dicarboxylic acid and alicyclic dicarboxylic acid. Alicyclic dicarboxylic cyclohexane-dicarbo

xylic acid) and at least one of aliphatic dicarboxylic acids succinic acid, adipic acid, sebacic acid, and dodecanedioic acid, Among the alcohols, non-ethylene glycols include propylene glycol, 1.4-butane-diol, diethylene glycol, 1.6-hexylene glycol, and bisphenol A. At least one of ethylene oxide which is a by-product of A) is used, and the thickness is 10-25 micrometers.

In the present invention, in the case of film thickness, when the corrosion resistance due to scratching of the film is considered in the manufacturing process, the thickness is difficult to be 10 μm or less, and in consideration of various economics, 25 μm or more is unreasonable.

Next, the manufacturing of the resin film and the thermal compression using the same will be described.

First, in the case of the resin film, the resin film which will form the resin film layer to be thermally compressed on the surface to be used as the inner surface of the tube is biaxially stretched as described above, and has a crystallinity of 50% or less, preferably 10 to 40%. The degree of polymerization corresponds to the relative circumference (concentration of resin 0.5 g / ochlorochlorophenol, measured at 25 ° C.) of 1.6 to 1.9, preferably 1.7 to 1.8, around the tube circumference of the vessel to be produced on the resin film. Except for the weld 10, the adhesive as described above is applied as shown in FIG. 1, heated at a temperature of about 70 to 130 ° C. for about 10 to 20 seconds to volatilize the solvent, and then the cut line 11 as shown in FIG. After forming, rewind and prepare in coil state.

Next, the composite resin film for forming the resin film layer 3 on the outer surface of the tube is manufactured by a more complicated process, first of all, in order to improve the clarity of the trademark design layer to be applied next to the resin film base described above. The white pigment is applied in advance. At this time, the amount of the white pigment is not fixed but only preferably the average particle size is 0.3 to 4.5 탆, 5 to 20% of the weight of the resin film is suitable, more preferably 8 to 17%.

Based on the resin film thus formed as a base, a print layer 2 displaying a trademark design on one surface thereof is formed by a gravure printing method.

Subsequently, the epoxy adhesive layer 4 as described above was applied to the opposite side of the resin film layer 3 having the printed layer 2 formed as described above, as shown in FIG. After heating for 20 seconds to evaporate the solvent, the epoxy adhesive is dried after coating so that the amount of the adhesive layer becomes 0.8 to 1.3 g / m 2 so as to correspond to the inner and outer films of the tube as shown in FIG.

After forming the overcoating layer 1 on the printing ink layer displaying the trademark design of the composite resin film prepared through such a process, and forming the perforation line 11 as in the above-described resin film for the inner surface of the tube, rewinding the coil shape Be prepared.

In some cases, from about 2-25% of the weight of the epoxy-based adhesive layer from the metal plate 5 side, an adhesive layer containing a white pigment is formed, and then a printing layer displaying a trademark design is formed thereon, and a polyester-based The resin layer may be formed, and finally, the overcoat layer may be formed.

As a type of metal plate needed to laminate the composite resin film manufactured as described above, a black plate, a cold rolled steel plate, a tin plated steel plate, and an electrolytic plate, which are generally used as raw materials for surface-treated steel sheets. Various chemically treated steel sheets including chromic acid treated steel sheets (Tin Free Steel), nickel plated steel sheets, tin / nickel double coated steel sheets, and chromate treatments can be used.

When using a tin plate or cold rolled steel sheet, the steel sheet is used as it is, or a chemical conversion coating is formed to perform lamination. When the adhesive condition of the resin film or adhesive is 180 ~ 240 ℃ or less, tin plate or cold rolled steel sheet can be used as it is, but when metal plate is heated above 240 ℃, it is discolored due to the formation of oxide film on the metal surface by heating. Adhesion of the film may be weakened, which may result in inadequate physical properties of the conventional material.

When the resin film is coated and the resin film is removed from the welded part and the welded pipe is left in the tin-plated plate, cold rolled steel, or chemically treated steel sheet, no problem occurs during welding. The welding part may be treated with tin or nickel or double plating of tin and nickel.

After coating the resin film on the tin plate or cold rolled steel or chemically treated steel sheet, remove the resin film of the welded part, and only the welded part is treated with tin or nickel or double plating of tin and nickel to ensure corrosion resistance of the welded part and high-speed welding. It is possible to manufacture this possible welded metal sheet.

Figure 3 schematically shows an example of the manufacturing process of the resin film-coated metal plate of the present invention, the metal plate 15, such as steel sheet is first heated while passing through the primary heater 20 to the laminate roll 30 And the resin film 16 prepared while passing through the laminate roll 30 is laminated on both sides of the metal plate 15, and then heated again by the secondary heater 40 so that the resin film 16 is completely transferred to the metal plate 15. The metal plate 25 by which the resin film was laminated on both surfaces by thermocompression bonding is obtained.

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

Example 1

A resin film corresponding to the outer surface of a tube, which was biaxially stretched with a thickness of 13 μm containing 15 wt% of titanium oxide-based white pigment, measured at 25 ° C. at a concentration of 30% of crystallinity and 100 ml of 0.5 g / ochlorophenol. In the polyethylene terephthalate resin film having a relative viscosity of 1.7 and a width of 839 mm, a label design printing layer using gravure printing was alternately placed in a printing portion of 163.8 mm and a cutting removal portion for 4 mm welding in parallel with the rolling direction of the metal plate. 5 lines were formed. After applying the epoxy adhesive to the opposite side of the polyethylene terephthalate resin film in which the printing design layer was formed, the solvent was volatilized at about 100 ° C. for 12 seconds, and the width of the adhesive was 163.8 mm to 4 mm in width so that the adhesive amount was 1.0 g / m 2. The solvent is volatilized at about 100 ° C. for 12 seconds in an oven while applying continuously in a strip shape while leaving a non-adhesive coating part for securing welds. Subsequently, after the overcoating layer is formed on the ink print layer displaying the trademark design, the perforation line 11 is made as shown in FIG. 1 and then rewound to prepare the coil.

Next, the inner surface of the resin film was also biaxially stretched with a thickness of 15 μm, and the relative viscosity measured at 25 ° C. at a concentration of 30% crystallinity and 100 g of 0.5 g / ochlorophenol was 1.7 and the width was 839 mm. After applying epoxy adhesive to the surface to be thermocompressed on the steel sheet in the same way as polyethylene terephthalate resin for the outer surface of the ethylene terephthalate resin film, volatilize the solvent at about 100 ° C for 12 seconds so that the amount of adhesive is 1.0g / ㎡ After the solvent was volatilized at about 100 ° C. for 12 seconds in an oven while continuously applying in a strip shape while leaving a non-adhesive coating portion for securing a welded portion of 43.8 mm with a width of 163.8 mm, the polyethylene terephthalate as shown in FIG. The cut line 11 is made into a shape having a positional relationship corresponding to front and back, and then rewound to prepare a coil state.

Steel plate for lamination, which leads to thin plate steel with a thickness of 0.15 mm and a plate width of 839 mm, having a tin plating adhesion of 2.8 g / m 2 and having chromate-treated metal chromium 8 mg / m 2 and hydrated chromium 5 mg / m 2 (as metal chromium). It heats up to 170 degreeC by heating, and is sent to the laminate roll 30. At this time, as shown in FIG. 3, the polyethylene terephthalate composite resin film 16 for external and inner surfaces is simultaneously primary-adhesive simultaneously in a state in which the surface coated with the adhesive is in contact with the steel sheet at the same speed as the line speed of the steel sheet.

The resin film laminate steel sheet thus first thermally compressed is secondarily heated to 250 ° C. by induction heating in the next process to achieve complete thermal bonding. In a straightforward process, by quenching water on both sides of the steel sheet and immersing it in a tank filled with water again, the steel sheet is quenched to 40 ° C. and the polyethylene terephthalate of the welded portion is removed without applying an adhesive to secure the welded portion. It is continuously drawn out of the line using a vacuum inhaler. As a final process, the laminated steel sheet is rewound. This is usually done at a speed of 200 m / min.

Example 2

A resin film corresponding to the outer surface of a tube, which was 2.5 times biaxially stretched in the longitudinal direction and 2.5 times in the transverse direction with a thickness of 10 μm, and measured at 25 ° C. at a concentration of 35% crystalline and 100 ml of 0.5 g / ochlorophenol. Rolling direction of the steel sheet with a unit of 164 mm in width and 1.6 mm in width and 160 mm in the resin film and 2 mm at each end, respectively, using a gravure printing on a polypropylene resin film having a viscosity of 1.6 and a width of 984 mm. 6 were formed in parallel with the. In this way, in the polypropylene resin film having the print design layer formed thereon, an epoxy-based adhesive containing 15 wt% titanium oxide-based white pigment was applied on the printed layer, and then the solvent was volatilized at about 80 ° C. for 20 seconds, and then the amount of the adhesive was 0.9. The solvent is volatilized under the same conditions as in Example 1 while applying continuously in a strip shape while leaving a non-adhesive coating portion for securing a welded portion of 4 mm at a width of 160 mm so as to have a g / m 2. Subsequently, after the overcoating layer is formed on the opposite side, a cut line 11 is made as shown in FIG. 1 and then rewound to prepare a coil.

Next, in the case of the resin film for inner surface of the tube, it was also biaxially stretched 2.5 times in the longitudinal direction of 2.5 μm in the longitudinal direction with a thickness of 10 μm, and at 25 ° C. at a concentration of 35% crystallinity and 100 ml of 0.5 g / ochlorophenol. Secure the welded part with 4mm of epoxy-based adhesive with 160mm width in the same way as the polypropylene composite resin film corresponding to the outer surface of the tube on the surface to be thermo-compressed to the steel sheet on the polypropylene resin film having a measured relative viscosity of 1.6 and a width of 984mm. After applying the coating continuously in the shape of a strip while leaving the non-adhesive coating part for the application, the solvent was volatilized at about 100 ° C. for 12 seconds after application, and the ratio for securing a welded portion having a width of 160 mm and a width of 4 mm was 1.0 g / m 2. The solvent is volatilized under the same conditions as in Example 1 while applying continuously in a strip shape while leaving the adhesive coating portion. Subsequently, a perforation line 11 as shown in FIG. 1 is made and rewound to prepare.

As a steel sheet for lamination, a so-called tin plate black plate having a plate thickness of 0.21 mm and a plate width of 984 mm was first heated to 120 ° C. using an ultrasonic heater 20 as shown in FIG. 3 to the laminate roll 30. send. At the same time, the polypropylene composite resin for the outside of the tube and the inner surface are first temporarily bonded in a state in which the surface coated with the adhesive is in contact with the steel sheet at the same speed as that of the steel sheet.

The composite resin film laminated steel sheet thus first thermally pressed is secondarily heated to 150 ° C. by induction heating in the next process to achieve complete thermal bonding. As a straight-line process, by quenching water on both sides of the steel sheet and immersing it in a tank filled with water again, the steel sheet is quenched to 40 ° C, and after removing the polypropylene film of the welded portion without applying an adhesive to secure the welded portion, the welding pipe is used. A resin film coated steel sheet was produced.

Example 3

A resin film that corresponds to the outer surface of a tube, with an average particle size of 2.5 µm and a biaxial stretching of 1.5 times in the longitudinal direction and 1.5 times in the transverse direction with a thickness of 10 µm containing 10 wt% titanium oxide-based white pigments and 35% crystals. A label design printed layer using gravure printing was applied to a polyolefin resin film having a relative viscosity of 1.8 and a width of 822 mm measured at 25 ° C. at a concentration of 100 ml of 0.5 g / ochlorophenol. 205.5 mm units which have a cut removal part for a weld part of mm (4 mm on both ends) were formed 4 width | variety according to the rolling direction of a steel plate. After applying the epoxy adhesive to the opposite side of the polyolefin resin film in which the printing design layer was formed, volatilizing the solvent at about 100 ° C. for 12 seconds, and securing a welded portion having a width of 201.5 mm and a width of 41.5 mm so that the amount of the adhesive was 1.0 g / m 2. The solvent is volatilized under the same conditions as in Example 1 while applying continuously in a strip shape while leaving a non-adhesive coating portion for the same. Subsequently, an overcoating layer is formed on an ink print layer displaying a trademark design, and then the cut line 11 is made as shown in FIG.

Next, in the case of the inner surface of the resin film, the biaxial stretching of 1.5 times in the transverse direction was also 1.5 times in the longitudinal direction of 15 μm in thickness, and at 25 ° C. at a concentration of 35% crystalline and 100 ml of 0.5 g / ochlorophenol. The amount of adhesive after volatilizing the solvent at about 100 ° C for 12 seconds after applying an epoxy-based adhesive to a surface to be thermocompressed to a steel sheet in the same manner as the polyolefin resin for external surfaces on a polyolefin resin film having a measured relative viscosity of 1.7 and a width of 822 mm. After the solvent was volatilized in the oven while continuously applying in a strip shape while leaving a non-adhesive coating portion for securing a welded portion of 20 mm with a width of 201.5 mm so as to be 1.0 g / m 2, the polyolefin film for the outer surface of the tube is shown in FIG. Prepare the perforation line with the shape having the positional relationship with the front and back and rewind it.

A steel sheet for lamination, which has a nickel plating adhesion of 0.60 g / m 2, and has a plate thickness of 0.16 mm and a plate width of 822 mm having a chromate-treated metal chromium 10 mg / m 2 and hydrated chromium 7 mg / m 2 (as metal chromium). It heats to 200 degreeC by 1st, and is sent to a laminate roll. At this time, as shown in FIG. 3, the polyolefin composite resin for the outside of the tube and the inner surface are first temporarily bonded in a state in which the surface coated with the adhesive is in contact with the steel sheet at the same speed as the traveling speed of the steel sheet.

The resin film laminate steel sheet thus first thermally compressed is secondarily heated to 250 ° C. by induction heating in the next process to achieve complete thermal bonding. In a straight-line process, water is sprayed on both sides of the steel sheet and immersed in a tank filled with water again to quench the steel sheet to 40 ° C, and then remove and rewind the polyolefin composite resin film of the welded portion without applying an adhesive to secure the welded portion. The usual resin film coating metal plate was produced.

Example 4

In the same manner as in Example 1, a polyethylene terephthalate resin film for the outside of the tube and an inner surface was prepared and chromated on a tin plating disc as a laminated steel plate, and the surface of the steel plate was coated with metal chromium, 8 mg / m 2, and hydrated chromium oxide was chromium. A steel sheet having a sheet thickness of 0.15 mm and a sheet width of 839 mm having 7 mg / m 2 was heated to 200 ° C. by induction heating and sent to a laminate roll. At this time, as shown in FIG. 3, the outer surface of the tube and the inner surface of the polyethylene terephthalate resin film are thermally bonded at the same time in such a state that the surface coated with the adhesive is in contact with the steel sheet at the same speed as the traveling speed of the steel sheet.

Thereafter, after removing the resin film of the welded portion without applying an adhesive to secure the welded portion after the secondary heating and cooling as in Example 1, tin plating with a tin adhesion amount of 0.5 to 2.5g / m 2 was performed in a conventional tin plating solution. After drying, it was rewinded to prepare a resin film-coated metal sheet for welding tubes.

Therefore, according to the present invention as described above, it is possible to omit the coating process made by a number of processes, it is environmentally friendly, the heating process through a plurality of ovens is omitted, energy saving can be expected, sheet-like By laminating continuously without performing the coating and printing process, productivity can be improved as compared with the conventional coating line.

In addition, the welding film can be produced by applying the resin film-coated metal sheet of the present invention as it is in the conventional welding pipe production line, it is expected to reduce the equipment cost, the conventional production method of the resin film for welding pipe is a tin plating line and a laminate line Although separately required, the present invention can be produced in one production line, which can lead to a drastic reduction in manufacturing costs.

Moreover, in producing a laminated metal sheet for welding pipes, there is a problem in that productivity is lowered due to difficulty in removing the resin film that is thermocompression-bonded to the weld. However, in the present invention, such a problem is solved so that the productivity can be greatly improved. Is obtained.

Claims (8)

A method of manufacturing a laminated metal plate for a 3-pipe can by coating a resin film on one side or both sides of a continuously supplied metal plate, wherein the welding tube is manufactured parallel to the rolling direction of the metal plate on one side of the resin film. After applying the adhesive in the shape of a strip to form an adhesive layer on the remaining portion except for the weld of the, the perforated line is formed at each end of the adhesive is applied, the side of the metal plate so that the surface on which the adhesive is applied to face the metal plate or After laminating a resin film on both sides, in order to secure a weld, the resin film coating metal plate manufacturing method characterized by peeling off the weld film. The method for producing a resin film-coated metal sheet according to claim 1, wherein the resin film comprises one or two or more selected from a polyester film, a polyolefin film, a polypropylene film, and a nylon film. The resin film according to claim 1, wherein the resin film comprises a low melting point adhesive layer, a resin film layer containing a white pigment, an ink printing layer displaying a trademark design, and an overcoating layer from the metal plate side in the case of the tube inner surface. And a low melting point adhesive layer and a resin film layer from the metal plate side. The resin film according to claim 1, wherein the resin film comprises a low melting point adhesive layer containing a white pigment from the metal plate side, an ink printing layer displaying a trademark design, a resin film layer and an overcoating layer in the case of the tube inner surface. And a low melting point adhesive layer and a resin film layer from the metal plate side. The method for manufacturing a resin film-coated metal sheet according to claim 1, wherein the metal sheet is made of any one of a tin plate (Black Plate) and a cold rolled steel plate. The method for producing a resin film-coated metal sheet according to claim 1, wherein a chemical conversion coating film is formed on the metal plate surface. The method for producing a resin film-coated metal sheet according to claim 1, wherein plating is made of at least one of nickel and tin on the welded portion from which the resin film is peeled off. A resin film-coated metal sheet for welded tube produced by the method of any one of the preceding claims.