JP2000037840A - Apparatus and method for manufacturing resin-coated metal plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent neck-in of a melt resin film extruded from T-dies when the resin film is coated on a metal plate by disposing between the T-dies and coater rollers two pairs of blowing means for blowing high-pressurized air to both the ends of the melt resin film extruded from the T-dies. SOLUTION: Nozzle 5, 5' for blowing right and left two pairs of air stream are provided directly under T-dies 2. Blowing high-pressurized air to both edges 3a of the melt resin film 3 prevents the width of the resin film 3 from contracting. The resin film 3 of the part where the high-pressurized air is not blown of the nozzle 5 is sandwiched along with a metal plate 1 by coater roller 4, 4' provided so as to have a rotational axis parallel in the lower surface of the T-dies 2 directly under the nozzle 5, thereby forming a resin coating metal plate 6 having a part 7 comprising only integrally overlapped resin films blown with the high-pressurized air by the nozzle 5 forced out of the metal plate 1 at both the sides. Thus neck-in of the melt resin film in prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an apparatus and a method for manufacturing a resin-coated metal plate. More specifically, when the resin melted by heating is extruded from a T-die onto a metal plate and then the molten resin film and the metal plate are sandwiched using a coater roll to cover the metal film with the T-die and the coater. Two sets of blowing means for blowing high-pressure gas to both ends of the molten resin film extruded from the T-die between the rolls are provided, and by blowing high-pressure gas to both ends of the molten resin film, the molten resin film becomes a neck. The present invention relates to an apparatus for manufacturing a resin-coated metal plate that prevents in (shrinkage in the width direction) and a manufacturing method using the apparatus.

[0002]

2. Description of the Related Art A thermoplastic resin is heated and melted, extruded from a narrow slit provided in a T-shaped die onto a metal plate which continuously advances, and then the resin and the metal plate are sandwiched using a roll. Extrusion coating, in which a film is coated on a metal plate, is widely practiced in the field of resin-coated metal plates. When extruding a resin melted by heating from a T-die, it is inevitable that the molten resin film extruded from the slit of the T-die contracts (neck-in) in the width direction of the slit of the T-die before coming into contact with the metal plate. Occurs. The neck-in phenomenon of the molten resin film is caused by the resin composition, the melt viscosity of the resin, the gap (air gap) between the slit of the T-die and the contact with the metal plate, the coating speed of the resin film, that is, the molten resin continuously advances. Fluctuates depending on the speed at which the molten resin comes out of the slit of the T-die and cannot follow the coating speed of the resin film. The film thickness at both ends is extremely thicker than other portions. When the neck-in phenomenon worsens, the resin extruded from the slit of the T-die hangs directly below the T-die, and when a certain amount of resin accumulates, the resin suddenly falls onto a metal plate. Each time, a pulsation phenomenon in which the neck-in becomes large or small occurs, and the thickness of the resin film coated on the metal plate also fluctuates periodically and becomes non-uniform. In the extrusion coating method of the present invention, it is assumed that the entire surface of the metal plate is coated with the resin, and the width of the molten resin film extruded from the slit of the T-die is always larger than the width of the metal plate. There is a need. Therefore, the width of the slit of the T-die must be provided considerably larger than the width of the metal plate in anticipation of the neck-in, but when the neck-in is further increased, the width of the molten resin becomes smaller than the width of the metal plate, The entire surface of the metal plate cannot be completely covered. Therefore, minimizing neck-in and preventing pulsation can be achieved by using a T-die with a small slit width, making the production equipment compact and enabling stable coating work, and furthermore, by using a T-die having a small thickness. It is extremely important in enabling coating.

As a method for preventing the neck-in of the heated molten resin film, the molten resin film is dropped on a casting roll for cooling and solidifying, and then over the entire width of the molten resin film 3 as shown in FIG. At the same time, the molten resin film 3 is pressed against the surface of the casting roll 8 by blowing a pressurized gas from one side using the molten resin film pressing means 12.
From the opposite side, using a molten resin film suction means 11, a device that sucks the air in the vicinity of the molten resin film 3 and urges the molten resin film 3 to adhere to the surface of the casting roll 8 has been devised. Installed and used.
However, in this apparatus, a suction nozzle of the molten resin film suction means must be provided between the T die and the casting roll, and an installation space for the suction nozzle is required.
The distance between the T-die and the casting roll must be increased to some extent, and it is unavoidable that the suspended falling distance of the molten resin film increases accordingly and the neck-in increases. Therefore, this apparatus cannot be applied to the apparatus for manufacturing a resin-coated metal plate of the present invention.

[0004]

According to the present invention, a resin melted by heating is extruded from a T-die onto a metal plate, and then the resin film is coated on the metal plate by sandwiching the molten resin film and the metal plate using a coater roll. An object of the present invention is to provide an apparatus for manufacturing a resin-coated metal plate that prevents a molten resin film extruded from a T-die from necking in, and a manufacturing method using the apparatus.

[0005]

According to a first aspect of the present invention, there is provided an apparatus for manufacturing a resin-coated metal plate, wherein a resin melted by heating is extruded from a T-die onto the metal plate, and then the molten resin film and the metal plate are formed using a coater roll. In the apparatus for manufacturing a resin-coated metal plate that covers the metal plate with the resin film by sandwiching, a high-pressure gas is blown to both ends of the molten resin film extruded from the T-die.
A set of spraying means is provided between the T-die and the coater roll. The device according to claim 2 is
Each of the two sets of spray means is provided with one or more blow holes so as to blow a high-pressure gas obliquely outward and forward with respect to the surface of the molten resin film end. In the method for producing a resin-coated metal plate according to claim 3, the resin melted by heating is extruded from a T-die onto the metal plate, and then the molten resin film and the metal plate are sandwiched using a coater roll to convert the resin film into a metal plate. At the time of coating, two sets of spraying means for blowing high-pressure gas to both ends of the molten resin film extruded from the T-die are provided between the T die and the coater roll, and the high-pressure gas is applied to both ends of the molten resin film. It is characterized by preventing the molten resin film from necking in by spraying. According to a fourth aspect of the present invention, in the method of the third aspect, a high-pressure gas is blown to the two sets of spraying means obliquely outward and forward with respect to the surface of the molten resin film end. One or more blowing holes are provided, and high-pressure gas is blown onto the resin surface so as to widen the molten resin film.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a resin melted by heating is extruded from a T-die onto a metal plate, and then the resin film is coated on the metal plate by sandwiching the molten resin film and the metal plate using a coater roll. At the time, T between T die and coater roll
Two sets of spraying means for blowing high-pressure gas to both ends of the molten resin film extruded from the die are provided. By blowing high-pressure gas to both ends of the molten resin film, the molten resin film is prevented from necking in. Is what you do. The high-pressure gas referred to here is a gas having a pressure such that when the high-pressure gas is blown onto the heated and melted resin film, the flow rate is such that the heated and melted resin film can swing back and forth and right and left. Point to. Hereinafter, an embodiment is shown and the present invention is explained in detail.

(Embodiment 1) FIGS. 2 and 3 show an example of an apparatus for producing a resin-coated metal plate according to the present invention. FIG. 2 shows an example in which both surfaces of a metal plate are coated with a resin film.
As shown in FIGS. 2 and 3, the heat-melted resin is T
It is extruded as a molten resin film 3 and 3a from a slit (not shown) provided on the lower surface of the die 2, generates a neck-in of Wn in both widths, is reduced to a width of Wt, and falls down. The nozzle 5 is provided as a blowing means for blowing two sets of airflows provided immediately below, and high-pressure gas is blown to both ends 3a of the molten resin film, whereby further narrowing is prevented. The molten resin film 3 in the portion of the nozzle 5 to which the high-pressure gas was not sprayed is coated with metal by a coater roll 4 provided immediately below the nozzle 5 so as to have a rotation axis parallel to a slit provided on the lower surface of the T-die 2. A high-pressure gas is blown by nozzles 5 protruding from the metal plate on both sides to form a resin-coated metal plate 6 having a portion 7 consisting of only a resin film that is overlapped and integrated.

As shown in FIG. 4 (a), each nozzle 5 has a pair of high-pressure gas blowout portions 5a opposed to the molten resin film end 3a in parallel so as to sandwich the molten resin film end 3a. It is arranged. Both blowing parts 5a are connected to a high-pressure gas supply means 5b such as a pressure-resistant hose connected to a high-pressure gas source (not shown).

As shown in FIG. 4A, the blowing portion 5a is provided obliquely outward and forward with respect to the surface of the molten resin film end 3a. The shape of the blowing part 5a is shown in FIG.
As shown in FIG. 4A, a point-shaped blowing hole 5c may be used, or as shown in FIG. 4B, a vertically elongated slit-shaped blowing hole along the longitudinal direction of the molten resin film end 3a. It may be 5d.

The nozzle 5 configured as described above is
A high-pressure gas blowout portion 5a provided in each of the left and right nozzles 5 is disposed between the coater roll 4 immediately below the T-die 2 so as to sandwich each end 3a of the molten resin.
By blowing a high-pressure gas from c or 5d to the molten resin end 3a, the molten resin film 3 extruded from the T-die 2 is necked in both widths, is reduced in width, and is further reduced in width. Can be prevented.

(Embodiment 2) FIGS. 5 and 6 show another example of the apparatus for manufacturing a resin-coated metal plate of the present invention. FIG.
1 shows an example in which a resin film is coated on both surfaces of a metal plate. As shown in FIGS. 5 and 6, the resin melted by heating is extruded as molten resin films 3 and 3a from slits (not shown) provided on the lower surface of the T-die 2, and a neck-in of Wn occurs in both widths. An air chamber 50 having a plurality of nozzles is provided as blowing means for blowing two sets of right and left airflows provided immediately below the T-die 2.
By blowing high-pressure gas to both ends 3a of the molten resin film, further narrowing is prevented. The portion of the molten resin film 3 in the air chamber 50 to which the high-pressure gas was not blown is
0 is sandwiched together with the metal plate 1 by a coater roll 4 provided so as to have a rotation axis parallel to a slit provided on the lower surface of the T-die 2 under the T die 2, and a high pressure is formed in an air chamber 50 protruding from the metal plate on both sides. A resin-coated metal plate 6 having a portion 7 composed of only a resin film that is blown with a gas and overlapped and integrated is obtained.

As shown in FIG. 7, each of the air chambers 50 has a pair of blow-off portions 50b provided with a plurality of high-pressure gas blow-out holes 50a opposed to the molten resin film end 3a. They are arranged in parallel so as to sandwich the portion 3a. The two blowing parts 50b are connected and united at a connecting part 50c, and are connected to a high-pressure gas supply means 50d such as a pressure-resistant hose connected to a high-pressure gas generating source (not shown).

As shown in FIGS. 7 and 8, a plurality of blowout portions 50a are provided in each blowout portion 50b obliquely outward and forward with respect to the surface of the molten resin film end 3a. As shown in FIG. 8C, a plurality of blow holes 50a may be provided along the width direction and the longitudinal direction of the molten resin film end 3a, respectively, or as shown in FIG. 8D. In addition, a plurality of long grooves along the longitudinal direction of the molten resin film end 3a may be provided in the width direction of the molten resin film end 3a.

The air chamber 50 constructed as described above is
The high-pressure gas blowout portions 50b provided in the right and left air chambers 50 are disposed between the coater roll 4 immediately below the T die 2 so as to sandwich the respective ends 3a of the molten resin, and provided in the blowout holes 50b. The molten resin film 3 is extruded from the T-die 2 by blowing high-pressure gas to the molten resin end 3a from the blowing hole 50a, and is narrowed due to neck-in in both widths. Can be prevented.

In the devices shown in the first and second embodiments, the case where the resin film is coated on both surfaces of the metal plate is shown. However, as apparent from FIGS. 2, 4, 5 and 7, these devices are used. Can be applied as it is without any change to the apparatus even when only one side of the metal plate is coated with the resin film.

[0016]

According to the apparatus of the present invention, the resin melted by heating is converted to T
When extruding from a die onto a metal plate, and then using a coater roll to sandwich the molten resin film and the metal plate and coating the metal film with the resin film, the molten resin extruded from the T die between the T die and the coater roll Spray high pressure gas to both ends of resin film 2
This is a manufacturing apparatus provided with a set of spraying means. By using the apparatus of the present invention, neck-in of the molten resin film is suppressed, and a resin-coated metal plate whose entire surface is coated with a film having a constant thickness can be manufactured using a compact manufacturing apparatus. It becomes possible.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a conventional molten resin film manufacturing apparatus.

FIG. 2 is a schematic side view showing an example of the apparatus for manufacturing a resin-coated metal plate of the present invention.

FIG. 3 is a schematic front view showing an example of the apparatus for manufacturing a resin-coated metal plate of the present invention.

FIG. 4A is a schematic front view showing an example of a blowing hole provided in a nozzle of the apparatus for manufacturing a resin-coated metal plate of the present invention, and FIG. 4B is another example of a blowing hole provided in the nozzle. FIG.

FIG. 5 is a schematic side view showing another example of the apparatus for manufacturing a resin-coated metal plate of the present invention.

FIG. 6 is a schematic front view showing another example of the apparatus for manufacturing a resin-coated metal plate of the present invention.

FIG. 7 is a schematic plan view showing a configuration of an air chamber of the apparatus for manufacturing a resin-coated metal plate of the present invention.

FIG. 8 (c) is a schematic front view showing an example of a blowout hole provided in an air chamber of the apparatus for manufacturing a resin-coated metal plate of the present invention, and FIG. FIG. 2 is a schematic front view showing an example of FIG.

[Explanation of symbols]

 1: Metal plate 2: T die 3: Molten resin film 3a: Both ends of molten resin film 4: Coater roll 5: Nozzle (spraying means) 5a: Blowing part 5b: High-pressure gas supply means 5c, 5d: Blowing hole 6 : Resin coated metal plate 7: Resin film protruding from metal plate 8: Casting roll 11: Molten resin film suction means 12: Molten resin film pressing means 50: Air chamber 50 a: Blow-out hole 50 b: Blow-out part 50 c: Connection Part 50d: high-pressure gas supply means 50e: high-pressure gas blowing direction Wn: neck-in width Wt: width of the molten resin film in which neck-in has occurred

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hiroshi Nakamura 1296-1, Toyoi, Higashitoyoi, Kudamatsu City, Yamaguchi Prefecture Inside Toyo Kohan Technical Research Institute (72) Inventor Hiroaki Ikenaga 1, 1296, Higashitoyoi, Kudamatsu City, Yamaguchi Prefecture F-term in Technical Research Institute Co., Ltd. (Reference) 4D075 AC04 AC54 AC60 AC72 AC93 AE24 BB05Y BB57Y CA48 DA06 DB02 EA15 4F100 AB01B AK01A BA02 EH112 EH232 EJ192 EJ212 EK06

Claims (4)

[Claims] 1. Production of a resin-coated metal sheet in which a resin melted by heating is extruded from a T-die onto a metal sheet, and then the resin film is coated on the metal sheet by sandwiching the molten resin film and the metal sheet using a coater roll. An apparatus for manufacturing a resin-coated metal sheet, comprising two sets of spraying means for spraying high-pressure gas to both ends of a molten resin film extruded from a T-die, between the T-die and a coater roll. 2. The blow-off means according to claim 1, wherein one or more blow-off holes are provided so as to blow a high-pressure gas obliquely outward and forward with respect to a surface of the molten resin film end. Equipment for manufacturing resin-coated metal sheets. 3. A method in which a resin melted by heating is extruded from a T-die onto a metal plate, and then the molten resin film is sandwiched between the metal plate and the metal plate using a coater roll. Two sets of blowing means for blowing high-pressure gas to both ends of the molten resin film extruded from the T-die between the rolls are provided, and by blowing high-pressure gas to both ends of the molten resin film, the molten resin film becomes a neck. A method for producing a resin-coated metal sheet, characterized in that the metal sheet is prevented from coming in. 4. One or more blowout holes are provided in each of the two sets of spraying means so as to blow a high-pressure gas obliquely outward and forward with respect to the surface of the molten resin film end. The method according to claim 3, wherein high-pressure gas is blown onto the resin surface so as to widen the film.