JP4142959B2 - Method for producing thermoplastic resin-coated metal sheet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a thermoplastic resin-coated metal plate used for metal canning.
[0002]
[Prior art]
Conventionally, as a method for producing a thermoplastic resin-coated metal plate suitable for can-making processability, a metal sheet such as an aluminum plate or a steel plate is unwound from an unwinding roll and guided to a guide roll, a preheating device, a laminating roll In general, those that pass through a heating device and a cooling region and are wound around a winding roller through a guide roll in the cooling region (see, for example, Patent Document 1).
[0003]
In addition, as a method for manufacturing thermoplastic resin-coated metal plates for cans, thermosetting adhesives are used to ensure excellent adhesion between the thermoplastic resin film and the metal plates, and to withstand retort sterilization. In order to make the thermoplastic resin film excellent in workability when a can is integrally formed from a thermoplastic resin-coated metal plate, or after being laminated, A method of amorphizing (so-called amorphizing) a state by heating a plastic resin film to a temperature equal to or higher than the crystal melting temperature and then rapidly cooling the plastic resin film has been conventionally performed (see, for example, Patent Document 2). ).
[0004]
[Patent Document 1]
JP-A-10-291253 (paragraph numbers 0001 to 0026)
[Patent Document 2]
JP-T-2-501638 (1st line from the top left column on the second page to the 6th line from the top right column on the bottom of the 6th page)
[0005]
[Problems to be solved by the invention]
However, a metal sheet (so-called metal plate) is heated to a temperature near or above the melting point of the polyester film (so-called thermoplastic resin film) and laminated to the metal sheet to form a laminate (so-called polyester resin-coated metal plate). After the formation, the laminate is reheated to a temperature near or above the melting point of the film by indirect means (means to reheat by a so-called reheating facility), and held at the temperature rise for a predetermined time, and then the polyester resin When manufacturing a polyester resin-coated metal plate in which the state of the film is made amorphous by rapidly cooling the coated metal plate to a temperature below the glass transition point of the film, the film surface is roughened or the film is roughened. Roll marks may occur over the entire area.
[0006]
As a result of earnestly researching the cause of appearance scratches such as rough rolls and roll marks on such polyester films, the above-mentioned external scratches did not occur immediately after the laminating point, but after reheating, It was found that roll marks were generated. That is, the laminated metal sheet is guided by several guide rolls and conveyed to a reheating facility. Here, the temperature of the metal sheet after lamination is lower than the melting point of the polyester film, but the polyester film that contacts the metal sheet side (metal sheet side polyester film) has a high molecular mobility and is in a rubbery state. It is easy to transfer the roll trace, and the temperature of the guide roll rises due to heat transfer from the metal sheet, which causes the rough surface of the guide roll and the roll trace to be transferred to the surface of the film. It was found that the smoothness of the surface roughness of the film was lowered.
[0007]
In this way, the surface of the film is not returned to a smooth state even if the polyester resin-coated metal sheet with the film surface roughened due to the surface roughness of the guide roll or the roll marks are reheated. The film becomes amorphous in a state in which the smoothness of the film is lowered or in a state close thereto.
[0008]
In this way, when the polyester film coated with the metal sheet is rough or has a roll mark, a blank is punched from the polyester resin-coated metal sheet, and the punched polyester resin-coated metal sheet is placed between the die and the wrinkle presser. When making cans by sandwiching, the frictional resistance between the film surface and tooling is increased, the film is damaged or peeled during canning, or the flange part is easily broken from the can body part. was there. In addition, when the laminating speed is increased, the time from the laminating point to the contact with the guide roll at the reheating equipment entrance is shortened, the temperature of the metal plate is difficult to decrease, and the temperature of the guide roll is received by the heat transfer from the metal plate. Therefore, the tendency for surface roughness and roll marks of the film to increase is increased.
[0009]
The present invention has been made by paying attention to the above technical problems, and improves the moldability when making a can using a thermoplastic resin-coated metal plate, and is made amorphous after lamination. An object of the present invention is to provide a method for producing a thermoplastic resin-coated metal plate capable of preventing the surface roughness of the thermoplastic resin and the generation of roll marks when the resin-coated metal plate is produced.
[0010]
[Means for Solving the Problem and Action]
In order to achieve the above-mentioned object, the invention of claim 1 continuously supplies a metal plate, continuously supplies a film member to at least one surface of the heated metal plate, and supplies the supplied film member. In the method of manufacturing a thermoplastic resin-coated metal plate by thermally bonding a metal plate to the heated metal plate, the metal plate is heated to a temperature near or above the melting point of the film member, and the film member is attached to the metal plate. After the laminate is formed, the laminate is cooled to a temperature lower than the cooling crystallization temperature from the point of lamination until the first contact with the guide roll after lamination, and the melted portion of the film member is solidified. The laminate is then reheated by indirect means for raising the temperature to a temperature equal to or higher than the melting point of the film member, and all or part of the film member of the laminate is melted. Is allowed, then quenched rapidly to the temperature below the glass transition temperature of the film member, a method which is characterized in that the heating cooling process to the crystallinity of the laminate film member a predetermined range.
[0011]
Therefore, according to the first aspect of the present invention, when the laminate is first brought into contact with the guide roll after lamination until the laminate is reheated, the laminate is first cooled before that, and the film member is laminated at the time of lamination. Since the melted portion of the film is solidified to such an extent that the surface roughness of the guide roll is not transferred, and the guide roll can be prevented from rising in temperature, it is possible to reduce the occurrence of roughness and roll marks on the film member, As a result, it is possible to prevent the film member from being damaged or peeled off during can making and to prevent the flange portion from being broken.
[0012]
In addition to the invention of claim 1, the invention of claim 2 provides the rapidly cooled laminate. When the film member is a single layer film, the crystallinity of the entire film member is 0 to 40%. When the film member is a multilayer film, at least the layer of the layer in contact with the metal plate is used. In this method, the film member is made in an amorphous state so that the crystallinity of the film member is in the range of 0 to 40%.
[0013]
Therefore, in the invention of claim 2, the crystallinity of at least the lower layer film member of the rapidly cooled laminate is made amorphous to 0 to 40%, thereby preventing the film member from being damaged or peeled off. In addition, the manufactured thermoplastic resin-coated metal plate can be applied to a high degree of processing (drawing and ironing) in which the thickness reduction of the can wall portion is large.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on specific examples shown in the drawings. FIG. 1 is a diagram showing a heat pattern of a lamination process in a method for producing an amorphized resin-coated metal plate (hereinafter referred to as an amorphized resin-coated metal plate) of the present invention. FIG. 2 is a schematic front view showing an apparatus for producing an amorphized resin-coated metal plate.
[0015]
As shown in FIG. 2, the manufacturing apparatus for consistently and continuously manufacturing the amorphized resin-coated metal plate continuously supplies a strip-shaped metal thin plate member (hereinafter simply referred to as a metal plate) 1a. A pair of film supplies for continuously supplying a metal plate supply device 2, a heating device 3 for preliminarily heating the metal plate 1a, and a thermoplastic resin film member (hereinafter simply referred to as a film member) 4. The apparatus 5 is provided with heating means for heat bonding inside, and the film member 4 fed from the film supply apparatus 5 and the metal plate 1a are continuously sandwiched between the heated metal plate 1 and bonded (laminate). A resin film crimping device 8 provided with a pair of laminate roll members 7 and a resin film metal plate obtained by laminating the metal plate 1a with the film member 4 (hereinafter simply referred to as laminating). Obtained by first cooling the laminate member 1b and the primary cooling device 9 for solidifying the melted portion by primary cooling (so-called cooling once) 1b to a temperature lowering the crystallization temperature or lower. A reheating facility (so-called amorphous oven) 10 for reheating the laminate member 1c to a temperature equal to or higher than the melting point of the resin film, and an air cooling device 11 for rapidly cooling the laminate member 1d obtained by reheating the laminate member 1c with air. (Secondary cooling device), a tertiary cooling device 12 for immersing or shower cooling the amorphous laminating member 1e obtained by rapidly cooling the laminating member 1d in cooling water, and the laminating member 1e with cooling water A winding device 13 for continuously winding the amorphized resin-coated metal plate 1f by lowering the temperature to near normal temperature by water cooling is provided. It is. In addition, the conveying system of the manufacturing apparatus includes a guide roll 21 that feeds the metal plate 1a sent from the metal plate supply device 2 in a direction counterclockwise 90 degrees with respect to the traveling direction, and a guide roll. The guide roll 22 which turns the metal plate 1a sent out by 21 in the direction of 90 degrees clockwise with respect to the traveling direction and feeds the metal plate 1a sent out by the guide roll 22 rotates clockwise with respect to the traveling direction. The laminating member 1c obtained by passing through the guide roll 23 fed out in the direction of 90 degrees and the heating device 3, the resin film crimping device 8 and the primary cooling device 9 is counterclockwise with respect to its traveling direction. A guide roll (a member that first contacts the laminate member 1c after the so-called laminating step) 24, the amorphous oven 10 and A roll member 25 that feeds the amorphous laminate member 1e obtained by passing through the cooling device 11 in a clockwise direction of 90 degrees with respect to the traveling direction, and the tertiary cooling device 12 And a roll member 26 that sends out the amorphized resin-coated metal plate 1f obtained by performing the temperature lowering process in a clockwise direction of 90 degrees with respect to the traveling direction. These roll members increase the degree of freedom of the sheet passing layout, and facilitate the space saving of the equipment.
[0016]
Here, first, the metal plate 1a serving as the base material of the amorphized resin-coated metal plate 1f will be described.
[0017]
The metal plate 1a is not particularly limited as a resin-coated metal plate, and may be a light metal plate such as aluminum, or a surface-treated steel plate subjected to various surface treatments such as metal plating and chemical conversion treatment. The light metal plate may be an aluminum plate or an aluminum alloy plate. Further, the material of the aluminum alloy plate may be a 3004 series or 3104 series aluminum alloy defined in Japanese Industrial Standard (JIS). The aluminum alloy plate may be any one that has been subjected to surface treatment after forming processing in a normal deep-drawn can or drawn iron can, for example, chromic phosphate treatment or zirconium phosphate treatment, In particular, in the case of a high degree of processing where the thickness reduction of the can wall is large, such as a squeezed iron can, an organic-inorganic composite chemical conversion treatment of phosphoric acid or zirconium phosphate and an organic resin is good, For the chemical conversion treatment, for example, chromium is contained in an amount of 1 to 40 mg / m. ² , Treatment with adhering phosphate chromate or zirconium 4-17 mg / m ² Those subjected to an attached zirconium phosphate treatment are preferred.
[0018]
The metal plate 1a is appropriately selected depending on the material, can size, application, and the like, and generally has a plate thickness of 0.15 mm to 0.40 mm. In the case of a steel plate, it is necessary to pay attention to the strength of the can body and the bottom pressure strength. For negative pressure cans, a plate thickness of 0.15 mm to 0.25 mm is used.
[0019]
As described above, the metal plate 1a is not particularly limited to the surface-treated steel plate, but a metal plate that is normally used as a steel plate for can manufacturing is applied, and the surface is used for the purpose of ensuring adhesion with the thermoplastic polyester resin film. For example, the amount of adhesion per side of a steel plate is 500 to 2000 mg / m. ² An ultra-thin tin-plated steel sheet with a tin-plated layer or an adhesion amount of 50 to 200 mg / m on one side of the steel sheet ² Metal chromium layer and the upper layer of the metal chromium conversion amount 5-25mg / m ² An amount of adhesion of 500 to 800 mg / m on one surface of an electrolytic chromic acid-treated steel sheet or a steel sheet laminated with a chromium hydrated oxide layer of ² Of nickel plating layer and the upper layer of chromium 1-30mg / m in metal conversion ² A nickel-plated steel sheet laminated with a steel sheet containing steel, or 20 to 2000 mg / m on one side of the steel sheet ² Nickel plating layer, 1mg / m on top of it ² ~ 100mg / m ² An organic-inorganic composite surface-treated steel sheet laminated with C (carbon) may be used. Further, from the viewpoint of preventing air entrainment at the time of lamination, it is desirable that the center line average roughness Ra of the steel sheet surface is Ra ≦ 0.2 μm in both the running direction and the width direction.
[0020]
The film member 4 covered with the metal plate 1a is made of a thermoplastic polyester resin film having good heat resistance and characteristics suitable for can applications. Examples of the polyester resin include polyethylene terephthalate (PET). ), Polybutylene terephthalate (PBT), polyethylene isophthalate (PEI), homopolymers such as copolymers of polyethylene terephthalate and polyethylene isophthalate, blends of such homopolymers, homopolymers, There are blends of copolymers, blend resins of copolymers, or multi-layers of these resins.
[0021]
Further, the melting point of the thermoplastic polyester resin is appropriately selected depending on the degree of the copolymer, the selection of the resin to be blended and the blend ratio thereof, and for example, a resin film having a melting point (Tm) of 200 ° C. to 260 ° C. is applied. .
[0022]
The film member 4 before the laminating step is generally heated within a temperature range of glass transition temperature (Tg) to (Tg) + 100 ° C. and uniaxially or biaxially stretched as necessary. Since the film thermal contraction in the metal plate width direction of the film member 4 becomes small in the amorphous process after the laminating process, it is preferable that the film member 4 is appropriately heat-set after stretching.
[0023]
FIG. 1 shows that, after the laminating process, the laminating member 1b is melted at least before being brought into contact with the guide roll 24 by cooling the laminating member 1b to a temperature lower than the temperature drop crystallization temperature (Tc-cool) by the primary cooling device 9. The part is solidified to form the laminate member 1c. Thereafter, the direction of travel is changed by the guide roll 24, the laminate member 1 c is reheated by the reheating equipment 10 to form the laminate member 1 d, and then the laminate member 1 d is formed by the air cooling device (secondary cooling device) 11. The amorphous laminate member 1e is formed by rapidly cooling to a temperature lower than the temperature lowering crystallization completion temperature, and the plate temperature of the laminate member 1e is lowered with cooling water by the tertiary cooling device 12, and the resin-coated metal plate 1f is formed. The heat pattern (heating cooling process) to form is shown.
[0024]
In the heat pattern after the laminating process, the laminated member 1c is heated and melted to a temperature equal to or higher than the melting point of the film member 4 thermally bonded by the reheating equipment 10, and then rapidly cooled to a temperature below the glass transition point of the film member 4 to be amorphous. However, when the film member 4 is made of a multilayer resin, only the lower layer side of the laminate member 1c may be amorphized and the upper layer side (surface layer) may leave an axially oriented crystal. . Lamination of the resin film on the metal plate is performed by a heat fusion method, a dry lamination method, an extrusion coating method, or the like. If the adhesion between the metal plate and the coating resin (resin layer) is poor, for example, a urethane adhesive, epoxy adhesive, acid olefin adhesive, or copolyamide type on one or both of the metal plate and resin film It is carried out by a method in which an adhesive, a copolyester adhesive or the like is provided and thermally bonded.
[0025]
When a thermosetting adhesive is interposed between the film member 4 and the metal plate 1a, the thermosetting adhesive is interposed with a width slightly narrower than the film width, and the adhesive layer At the end of the film member 4 that is not present, it is preferable to directly bond the portion to the metal plate 1a in order to prevent the occurrence of film hair during canning.
[0026]
In addition, depending on the printing design applied to the outer surface of the can, the adhesive may be added with several percent of titanium oxide, which is a white pigment, or a color pigment or toner other than white as long as adhesion and processability are not deteriorated. Good.
[0027]
Next, the laminating process of the amorphized resin-coated metal plate 1f and the roll member in the amorphous process will be specifically described below.
[0028]
The laminating process will be described. First, the outer periphery of the laminating roll member 7 is composed of a rubber member 7a, and the rubber member 7a comes into contact with the traveling film member 4. Next, the rubber member 7a is deformed so that the outer peripheral portion in contact with the film member 4 is slightly flat, and the pressing force due to the deformation is maximized at the flat central portion. And the part which begins to leave | separate from the film member 4 among the outer peripheral parts of the rubber member 7a by the rotation of the laminating roll member 7 quickly returns to the original shape by the rotation of the laminating roll member 7, and thereafter The film member 4 comes into good contact again.
[0029]
Here, the rubber member is continuously deformed so that the metal plate 1a and the film member 4 are pressure-bonded satisfactorily. That is, the metal plate 1a and the film member 4 are reliably pressed against the entire surface of the laminate member 1b, and the film member 4 is pressurized so that the surface of the laminate member 1b is uniform, and the laminate member 1b It is preferable that the surface does not have undulations, is smooth, and has excellent appearance.
[0030]
This rubber member is a fluorine-based rubber material (Meiji Rubber Kasei product name: Chemi Black DM) prepared with a Shore hardness of 90 or more (see Japanese Industrial Standards: JIS Z 2246). Standard: The center line average roughness (Ra) referred to JIS B 0601 is processed to 0.2 μm or less, or the maximum height (Rmax) is processed to 3 μm or less. The guide roll 24 is made of a rubber member having the same material, the same center line average roughness and hardness as the laminate roll member 7.
[0031]
Next, the primary cooling process will be described. First, the laminating member 1b formed after the laminating process is first brought into contact with the guide roll at the entrance point of the amorphous oven 10 from the laminating point (so-called bonding point) by the primary cooling device 9. In the meantime, the film member 4 is primarily cooled to a temperature lowering crystallization temperature (Tc-cool) of the laminated film member 4 or lower, preferably lower than the temperature lowering crystallization completion temperature, and the melted portion of the film member 4 is solidified. That is, the laminate member 1c has low molecular mobility. Therefore, the laminating member 1 c is turned in the traveling direction by the guide roll 24 and supplied to the amorphous oven 10, but it is possible to prevent the roll trace and the surface from being roughened due to contact with the guide roll 24. In addition, as long as the primary cooling can be performed without contact with the film, a cooling means using a refrigerant is used in addition to air cooling.
[0032]
Next, the amorphous process will be described. For this reheating, an infrared heater or the like can be used in addition to the heating oven such as the amorphous oven 10. The film member 4 on the metal plate 1a is completely melted by the amorphous oven 10, cooled by the air cooling device 11 (secondary cooling), and rapidly cooled to a temperature equal to or lower than the temperature lowering crystallization completion temperature of the film member 4 within 3 seconds. In the case of a single layer film, the film member 4 is amorphized so as to be in the range of 0 to 40%, and in the case of a multilayer film, the crystallinity of at least the lower layer is 0 to 40%. The film member is amorphized to be in the range, and all or part of the film member is amorphized. Subsequently, in order to maintain the crystallinity, the film member 4 is further wound after being cooled by water or air (cooled to a glass transition temperature (Tg) or lower) by the tertiary cooling device 12.
[0033]
Here, after the film member 4 on the metal plate 1a is reheated to a reheating temperature (Tm) to (Tm) + 30 ° C., the film member 4 is cooled rapidly by air cooling by air jet (so-called water cooling). A method using a shower, a water-cooled tank), a method using a combination thereof, or the like can be selected as appropriate.
[0034]
The procedure for measuring the degree of crystallinity is as follows.
(1) The amorphous laminate material is dipped in 7 wt% hydrochloric acid to peel the film from the metal plate.
(2) Wash the peeled film thoroughly with pure water.
(3) After drying at room temperature, 5 mg is collected and subjected to thermal analysis (DSC 1st run).
(4) Thermal analysis (DSC 1st run) is measured at a heating rate of 10 ° C./min, and an exothermic peak around 70 ° C. is measured. The measured value is A.
(5) After heating the sample (the film subjected to DSC 1st run in the above (4)) above the melting point, it is rapidly submerged and dried at room temperature.
(6) Then, thermal analysis (DSC 2nd run) is performed under the same conditions as in (4) above, and an exothermic peak near 70 ° C. is measured. This measured value is represented by B.
(7) Then, the crystallinity is calculated from the measured values A and B as follows.
[0035]
Crystallinity = (B−A) / B × 100 (%)
[0036]
FIG. 3 shows a typical example of heat flow obtained from a differential scanning calorimeter (DSC) in the case of polyethylene terephthalate (PET). 3 indicates a temperature lowering process in which the temperature (Temperature) decreases in the negative direction of the figure, and a solid line b in FIG. 3 indicates a temperature increasing process in which the temperature increases in the positive direction of the figure.
[0037]
As shown by solid lines a and b in FIG. 3, the temperature-falling crystallization temperature (Tc-cool) is higher than the temperature-rising crystallization temperature (Tc), and after being supplied to the amorphous oven, the laminate member 1b Is rapidly cooled by the air cooling device 11 to a temperature lower than the temperature lowering crystallization completion temperature (indicated by Tc-cool (completed) in the figure). At this time, depending on the resin composition, if the cooling temperature is higher than the temperature-rising crystallization temperature (Tc), the recrystallization of the film proceeds. Therefore, to prevent recrystallization of the film, the temperature is lower than the temperature-falling crystallization completion temperature. It is preferable to cool by the tertiary cooling device 12 to below the glass transition temperature (Tg).
[0038]
The amorphized resin-coated metal plate 1f is manufactured by a series of steps (one pass) from the lamination step to the amorphous step, but the above method is efficient. After laminating by the apparatus 8, the laminated member 1b is temporarily wound by the primary cooling device 9 to solidify the melted portion of the laminated member, and is unwound by a reheating facility 10 provided separately from the laminating process. You may employ | adopt the system (2 passes) which winds up again through an amorphous process.
[0039]
One or more raw materials of normal butyl stearate, liquid paraffin, petrolatum, polyethylene wax, edible oil, palm oil, synthetic paraffin are formed on the resin layer of the resin-coated metal plate 1f. The lubricant may be applied and wound up. Alternatively, the lubricant may be applied at the time of can making using a laminate member as a material. Moreover, in the said embodiment, although both surfaces of the laminate member 1b are primary-cooled, if the cooling capability is high, you may make it primary-cool only the surface side which contacts the guide roll 24. FIG.
[0040]
Next, each example when the above-described steps are performed based on the following resin characteristics and temperature conditions will be described.
[0041]
First, in Example 1 (examples shown in Experiment Nos. 1 to 5 in FIG. 4),
(1-1) As the metal plate 1a, a 3004 aluminum alloy that has been subjected to a phosphoric acid chromate treatment is used.
(1-2) As the film member 4, a PET / I copolymer (two-layer) film of a copolymer is used. Here, the melting point (Tm) of the film member 4 is 240 ° C. at the upper layer (surface layer), 220 ° C. at the lower layer (metal plate side), and the glass transition temperature (Tg) of the lower layer of the film member 4 is 70 ° C. The melting start temperature (Tl) of the lower layer of the film member 4 is 200 ° C., and the temperature lowering crystallization temperature (Tc-cool) of the lower layer of the film member 4 is 160 ° C. The film member 4 before the lamination step is stretched three times in length and three times in a stretching temperature of 100 ° C., and is heat-set at 170 ° C.
[0042]
Next, in Example 2 (examples shown in Experiment Nos. 6 to 10 in FIG. 4),
(2-1) The same metal plate 1a as described in the above number (1-1) is used.
(2-2) As the film member 4, a PBT / PET (however, the mass ratio of PBT and PET is 6 to 4) blend single layer film is used. Here, the melting point (Tm) of the film member 4 shows two peak values of 220 ° C. and 250 ° C., the glass transition temperature (Tg) of the film member 4 is 50 ° C., and the melting start temperature of the film member 4 (T1) is 200 ° C., the temperature-falling crystallization temperature (Tc-cool) is 170 ° C., and the film member 4 before the lamination process is stretched at a stretching temperature of 100 ° C. three times in length and three times in width, It is heat-set.
[0043]
FIG. 4 below shows the results of evaluation based on the resin characteristics and temperature conditions of the above-described examples.
[0044]
Here, considering the contents of FIG.
(1) When the temperature immediately before the laminating member 1b contacts the guide roll 24 is higher than the temperature drop crystallization temperature (Tc-cool) (Experiment No. 1, 6) or the same (Experiment No. 2, 7) The surface of the laminate member 1a is rough and roll marks are generated, and the numerical value of the formability (breaking rate) is high.
(2) It can be seen that the surface roughness of the amorphized resin-coated metal plate 1f and the transfer pattern of the roll member 24 adversely affect the formability.
(3) The amorphized resin-coated metal plate 1f has the above-described laminating process and amorphous process in which the experiment number No. 1 shown in FIG. Since it is carried out under the resin characteristics and temperature conditions of Examples 3 to 5, 8 to 10, the appearance of the laminate member as shown in the evaluation results (FIG. 4) is the surface roughness of the film and the roll of the roll member 24. There is no generation of marks, and the fracture rate during molding is 0%, which is favorable.
[0045]
【The invention's effect】
As described above, according to the first aspect of the present invention, the metal plate is heated to a temperature near the melting point of the film member or higher, and the laminate is formed by laminating the film member on the metal plate. Indirect means for primarily cooling the laminate from the laminating point to the first contact with the guide roll after laminating, bringing the melted portion of the film member into a solidified state, and then raising the temperature to a temperature equal to or higher than the melting point of the film member By reheating the laminate, melting all or part of the film layer of the laminate, and then rapidly cooling to a temperature below the glass transition temperature of the film member to crystallize the film member of the laminate Heating / cooling treatment is performed so that the degree is within a predetermined range, so that it is possible to prevent surface roughness and roll traces of the coated film member after lamination. , It is possible to produce the adhesive, a thermoplastic resin coated metal sheet having excellent formability of the film member.
[0046]
According to the invention of claim 2, in addition to the effect obtained by the invention of claim 1, a rapidly cooled laminate When the film member is a single layer film, the crystallinity of the entire film member is 0 to 40%. When the film member is a multilayer film, at least the layer of the layer in contact with the metal plate is used. Since the film member is in an amorphous state so that the crystallinity of the film member is in the range of 0 to 40%, the obtained thermoplastic resin-coated metal plate is also applied to a squeezed iron can that requires a high degree of processing. be able to.
[Brief description of the drawings]
FIG. 1 is a diagram showing a heat pattern of a laminating step in a method for producing an amorphized resin-coated metal plate targeted in the present invention.
FIG. 2 is a schematic front view showing an apparatus for producing an amorphized resin-coated metal plate which is an object of the present invention.
FIG. 3 is a heat flow diagram obtained from a differential scanning calorimeter in the case of polyethylene terephthalate.
FIG. 4 is a table showing evaluation results when each step of FIG. 2 is performed based on resin characteristics and temperature conditions.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1a ... Metal plate, 4 ... Film member, 1b, 1c, 1d, 1e ... Laminate member, 1f ... Amorphized resin coating metal plate.

Claims (2)

A metal plate is continuously supplied, and a film member is continuously supplied to at least one surface of the heated metal plate, and the supplied film member is thermally bonded to the heated metal plate, and the thermoplastic resin-coated metal. In a method of manufacturing a plate,
The metal plate is heated to a temperature near or higher than the melting point of the film member, and the film member is laminated on the metal plate to form a laminate. The laminated body is cooled by an indirect means for cooling to a temperature lowering the crystallization temperature or lower until it contacts the guide roll, bringing the melted portion of the film member into a solidified state, and then raising the temperature to a temperature above the melting point of the film member. Is reheated to melt all or a part of the film member of the laminate, and then rapidly cooled to a temperature not higher than the glass transition temperature of the film member to determine the crystallinity of the film member of the laminate. A method for producing a thermoplastic resin-coated metal sheet, wherein the heating and cooling treatment is performed so as to be in a range. Wherein when the film member quenched laminate is a single layer film, crystallinity of the entire said film member is 0-40%, or in the case of multilayer films, the full Irumu member layer in contact with at least a metal plate crystals The method for producing a thermoplastic resin-coated metal sheet according to claim 1, wherein the amorphous state is set so that the degree of conversion is in the range of 0 to 40%.

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