JP2000037841A - Apparatus and method for manufacturing resin-coated metal plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent contraction of a melt resin film extruded from T-dies in the width direction by disposing between the T-dies and coater rollers two pairs of suction portions for sucking the air in the vicinity of both the ends of the melt resin film extruded from the T-dies when the resin film is coated on a metal plate. SOLUTION: A heated and melted resin is extruded as a melt resin film 3 from a slit provided at the lower surface of T-dies 2, and neck-in Wn (contraction in the width direction) occurs at both the sides, so as to be reduced width Wt, suspended and drop. Suction portions 5 for sucking the air in the vicinity of both the ends of right and left two pairs of melt resin films 3 are provided directly under the T-dies 2, and both the ends of the melt resin film are attracted to the suction direction, thereby preventing the further reduction in the width. The melt resin film 3 of the part where the suction effect does not reach is sandwiched along with a metal plate 1 by coater rollers 4 provided at the lower surface of the T-dies and is attracted by suction portions 5 forced out of the metal plate at both the side and overlapped, thereby forming a resin coating metal plate 6 having a part 7 comprising only the resin films.

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, the resin melted by heating is extruded from a T-die onto a metal plate, and then, when the resin film is coated on the metal plate by sandwiching the molten resin film and the metal plate using a coater roll, the T-die and the coater are used. Two sets of suction parts are provided between the rolls for sucking the atmosphere near both ends of the molten resin film extruded from the T-die. The suction is performed, and both ends of the molten resin film are drawn in the suction direction. The present invention relates to an apparatus for manufacturing a resin-coated metal plate that prevents neck-in (shrinkage in the width direction), and a manufacturing method using the apparatus.

[0002]

2. Description of the Related Art 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. Also, if the neck-in phenomenon worsens,
The resin extruded from the slit of the T-die hangs directly below the T-die, and when the resin accumulates to some extent, it falls on the metal plate at a stretch, resulting in repeated occurrences of the neck-in. Pulsating phenomena occur, and the thickness of the resin film coated on the metal plate periodically fluctuates 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, in consideration of the neck-in, the width of the slit of the T-die must be provided considerably larger than the width of the metal plate, 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. Pressing the molten resin film 3 against the surface of the casting roll 8 by blowing a pressurized gas from one side using the molten resin film pressing means 12, and simultaneously using the molten resin film suction means 11 from the opposite side A device has been devised which sucks the air in the immediate vicinity of the resin film 3 and urges the molten resin film 3 to adhere to the surface of the casting roll 8 and is attached to a film forming apparatus 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. For this reason, the distance between the T-die and the casting roll must be increased to some extent, and the suspended falling distance of the molten resin film is correspondingly increased, and it is inevitable that 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]

SUMMARY OF THE INVENTION 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 sheet, wherein a resin melted by heating is extruded from a T-die onto the metal sheet, and then the molten resin film and the metal sheet are sandwiched using a coater roll. In a manufacturing apparatus for a resin-coated metal plate that coats a metal plate with a resin film by attaching, two sets of suction units for sucking air near both ends of a molten resin film extruded from a T-die include a T-die and a coater roll. It is characterized by being provided between. In the method for manufacturing a resin-coated metal plate according to claim 2, the resin melted by heating is extruded from a T-die onto the 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. When performing the suction, two sets of suction parts are provided between the T-die and the coater roll for sucking the atmosphere near both ends of the molten resin film extruded from the T-die, and the suction is performed. To prevent the molten resin film from being necked-in by being drawn toward the substrate.

[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 this time, two sets of suction parts are provided between the T-die and the coater roll for sucking the atmosphere near both ends of the molten resin film extruded from the T-die, and the suction is performed. This prevents the molten resin film from necking in due to drawing. Hereinafter, the present invention will be described in detail.

FIGS. 2 and 3 show an example of an apparatus for producing a resin-coated metal sheet 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 extruded as molten resin films 3 and 3a from slits (not shown) provided on the lower surface of the T-die 2, and a Wn neck-in occurs in both widths. And falls down to the width of Wt.
Suction unit 5 for sucking the atmosphere near both ends of the set of molten resin films
Is provided, and the atmosphere near both ends 3a of the molten resin film is sucked,
By pulling both ends 3a of the molten resin film in the suction direction, further width reduction is prevented. The portion of the molten resin film 3 to which the suction effect of the suction section 5 does not reach is directly below the suction section 5.
A suction unit 5 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 die 2 and protruding from both sides of the metal plate.
To form a resin-coated metal plate 6 having a portion 7 consisting only of a resin film that is integrated by being overlapped.

As shown in FIG. 4, each of the suction sections 5 is connected to a suction nozzle 5a disposed in close proximity to the end of the molten resin film end 3a, and the suction nozzle 5a is connected to suction means such as a rotary pump (not shown). And a connecting means 5b such as a pressure-resistant hose.

The suction unit 5 constructed as described above is
It is disposed between the coater roll 4 immediately below the die 2 and the end of the molten resin film end 3a, and the air near the molten resin film end 3a is sucked from the molten resin film end 3a. An airflow toward the nozzle is generated, and the airflow draws the molten resin film end 3a in the direction of the suction nozzle, so that the molten resin film end 3a is extruded from the T-die 2, forms a neck-in in both widths, is reduced in width, and falls down. Further narrowing of the molten resin film 3 can be prevented.

In the above-described apparatus, the case where the resin film is coated on both surfaces of the metal plate is shown. However, as is apparent from FIGS. 2 and 4, these devices cover the resin film only on one surface of the metal plate. In such a case, it is possible to apply the apparatus without any change to the apparatus.

[0011]

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 to coat the resin film on the metal plate, the molten resin extruded from the T die between the T die and the coater roll An apparatus for manufacturing a resin-coated metal plate, comprising two sets of suction sections for sucking air near both ends of a resin film, wherein the apparatus of the present invention is used to move both ends of a molten resin film in a suction direction. The neck-in of the molten resin film is suppressed by being drawn toward. In addition, a resin-coated metal plate in which the entire surface of the metal plate is coated with a film having a certain thickness can be manufactured using a compact manufacturing apparatus.

[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. 4 is a schematic plan view showing a configuration of a suction unit of the apparatus for manufacturing a resin-coated metal plate of the present invention.

[Explanation of symbols]

 1: Metal plate 2: T die 3: Molten resin film 3a: Both ends of molten resin film 4: Coater roll 5: Suction section 5a: Suction nozzle 5b: Connecting means 5c: Direction of sucking air 6: Resin coated metal Plate 7: Resin film of portion protruding from metal plate 8: Casting roll 11: Melt resin film suction means 12: Melt resin film pressing means Wn: Neck-in width Wt: Width of molten resin film in which neck-in occurred

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Hiroshi Nakamura, 1296-1, Toyoi, Higashitoyoi, Kudamatsu, Yamaguchi Prefecture Inside the Technical Research Institute of Toyo Kohan Co., Ltd. F-term in Technical Research Institute, Inc. (reference) 4D075 AC04 AC54 AC59 AC72 AE24 BB05Y BB56Y CA48 DB02 EA15 4F100 AB01B AK01A BA02 EH112 EJ192 EJ242 EK06

Claims (2)

[Claims] 1. Production of a resin-coated metal plate in which 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. In the apparatus, two sets of suction units for sucking the atmosphere near both ends of the molten resin film extruded from the T-die and drawing both ends of the molten resin film in the suction direction are provided.
An apparatus for manufacturing a resin-coated metal plate provided between a T-die and a coater roll. 2. Extruding a resin melted by heating from a T-die onto a metal plate, and then using a coater roll to sandwich the molten resin film and the metal plate and cover the metal plate with the resin film.
Two sets of suction parts are provided between the die and the coater roll for sucking the atmosphere near both ends of the molten resin film extruded from the T-die. The suction is performed, and the molten resin film is melted by drawing both ends in the suction direction. A method for manufacturing a resin-coated metal plate, wherein necking of a resin film is prevented.