JP2000037763A - Device and method for manufacture of resin-coated metal plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a molten resin coating film from being affected by a necking phenomenon by providing specified sets of endless belt devices which clamp both end parts of the molten resin coating film to be extruded from a T-die between the T-die and a coater roll. SOLUTION: An endless belt 9 is hooked around two right/left sets of pulleys 5 which are installed right below a T-die 2 in such a manner that the pulleys 5 have rotary shafts in parallel with a slit formed on the lower face of the T-die 2 and clamp a molten resin coating film end part 3a and further around a coater roll 4 which is installed right below the pulleys 5 in such a manner that the coater roll 4 has a rotary shaft in parallel with a slit formed on the lower face of the T-die 2. A heated molten resin is extruded as molten resin coating films 3, 3a from the slit formed on the lower face of the T-die 2. Then a necking phenomenon occurs across the width of the coating films 3, 3a, which contract in width, dropping after being suspended. However, the two right/left sets of the endless belts 9 provided in parallel with the molten resin coating films 3, 3a right below the T-die 2 clamp the molten resin coating film 3a. Thus it is possible to prevent the width contraction from occurring beyond the existing level.

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 molten resin 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 plate with the resin film, two sets of endless A resin coated metal that prevents the molten resin film from neck-in (shrinkage in the width direction) by sandwiching both ends of the molten resin film extruded from the T-die between the T-die and the coater roll using a belt device. The present invention relates to a plate manufacturing apparatus 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 right below the T-die, and when resin accumulates to some extent, it falls on the metal plate at a stretch, causing repeated occurrences.
Each time, a pulsation phenomenon in which the neck-in increases or decreases occurs, 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, 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 are achieved by using a T-die with a small slit width, making the manufacturing equipment compact and enabling stable coating work.
Furthermore, it is extremely important to enable coating of a film having a constant thickness.

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, and the distance between the T die and the casting roll is increased to some extent. It must be widened, and it is inevitable that the distance of the suspended falling of the molten resin film becomes longer 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]

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 of a resin-coated metal plate for coating a resin film on a metal plate by attaching, two sets of endless belt devices for sandwiching both ends of a molten resin film extruded from a T-die between a T-die and a coater roll are provided. It is characterized by being provided. The device according to claim 2 is characterized in that at least a portion of the endless belt that contacts the molten resin film is made of Teflon. Claim 3
The method for producing a resin-coated metal sheet described in
When extruding from a die onto a metal plate and then coating the resin film on the metal plate by sandwiching the molten resin film and the metal plate using a coater roll, two sets of T endless belt devices are used.
By sandwiching both ends of the molten resin film extruded from the die between the T-die and the coater roll, the molten resin film is prevented from being necked in.

[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, the end portion of the molten resin film extruded from the T-die is sandwiched between the T-die and the coater roll using two sets of endless belt devices to prevent the molten resin film from being necked in. is there. Hereinafter, the present invention will be described 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 and forms a neck-in in both widths, narrows down, and hangs down. Both ends 3a of the molten resin film are sandwiched between two sets of left and right endless belts 9 provided in parallel with 3 and 3a, and further width reduction is prevented. The endless belt 9 has a rotation axis parallel to a slit provided on the lower surface of the T-die 2 directly below the T-die 2 and has a molten resin film end 3.
a and two sets of pulleys 5 provided so as to sandwich
It is wrapped around 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 immediately below the pulley 5 and circulates. The coater roll 4 also serves as the other pulley for rotating the endless belt 9. The pulley 5 sandwiches the molten resin film end 3a, the coater roll 4 also sandwiches the molten resin film 3 and 3a, and the endless belt 9 continuously connects the molten resin film end 3a between the pulley 5 and the coater roll 4. Pinch it. The portion of the molten resin film 3 not pinched by the pulley 5 is pinched by the coater roll 4 together with the metal plate 1,
A resin-coated metal plate 6 having a portion 7 consisting of only a resin film which is sandwiched between the pulley 5 and the endless belt 9 protruding from the metal plate on both sides and overlaps and is integrated.

Each of the pulleys 5 is provided so as not to sandwich the metal plate 1. When the molten resin film 3 in a portion not sandwiched by the pulley 5 is sandwiched together with the metal plate 1 by the coater roll 4, the metal When the plate is thin, the resin film of the portion not sandwiched by the pulley 5 and the coater roll 4 also overlaps and is integrated, and is taken in as a part of the portion 7 composed of only the resin film. As described above, it is possible to manufacture a resin-coated metal plate in which neck-in is suppressed and the entire metal plate is coated with a film having a certain thickness.

(Embodiment 2) FIG. 4 shows another example of the apparatus for manufacturing a resin-coated metal plate of the present invention. In the embodiment shown in FIG. 4, when the endless belt 9 shown in FIG. 3 is wrapped around two sets of pulleys 5 on the left and right and the coater roll 4, the endless belt 9 is moved between the pulleys 5 on the left and right and the coater roll 4 respectively. The tension of the endless belt 9 is increased by moving the deflector roll 10 in the direction of the molten resin film end 3a, and as a result, the molten resin film end 3a by the left and right endless belts 9 is provided.
Can be secured.

In the first and second embodiments, at least a portion of the endless belt 9 which is in contact with the molten resin 3a is preferably made of a material which does not fuse with the molten resin, and is preferably made of Teflon. It is particularly preferable from the viewpoint of fusing property and economy. Also, in order to securely grip the molten resin film on the endless belt surface, even if the endless belt surface is provided with a plurality of holes and / or projections and / or a plurality of grooves for generating an anchor effect, the grip may be urged. Good.

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 is apparent from FIGS. Even when only one side is coated with a resin film, the apparatus can be applied without any change to the apparatus.

[0012]

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 cover the metal film with the resin film, a T-die is used to prevent neck-in growth of the molten resin film. A resin-coated metal sheet manufacturing device that is provided with two sets of endless belt devices between the T-die and the coater roll to sandwich both ends of the molten resin film extruded from the T-die and prevent further growth of neck-in. is there. By using the apparatus of the present invention, neck-in is suppressed, and 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 side view showing another example 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: Pulley 6: Resin-coated metal plate 7: Resin film protruding from metal plate 8: Casting roll 10: deflector roll 11: molten resin film suction means 12: molten resin film pressing means

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) // B29L 9:00 (72) Inventor Hiroshi Nakamura 1296-1, Higashi-Toyoi, Kudamatsu City, Yamaguchi Prefecture Toyo Steel Sheet Co., Ltd. Within the Technical Research Institute (72) Inventor Hiroaki Ikenaga 1296-1, Higashi-Toyoi, Kudamatsu City, Yamaguchi Prefecture Toyo Kohan Co., Ltd. F-term (Reference) KA17 KB13 KB22 KK88

Claims (3)

[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. An apparatus for manufacturing a resin-coated metal plate, comprising two sets of endless belt devices for sandwiching both ends of a molten resin film extruded from a T-die between a T-die and a coater roll. 2. The manufacturing apparatus according to claim 1, wherein at least a portion of the endless belt that contacts the molten resin film is made of Teflon. 3. Extruding the heated and melted resin from a T-die onto a metal plate, and then using a coater roll to sandwich the molten resin film and the metal plate to cover the metal film with the resin film.
A pair of endless belt devices are used to prevent the molten resin film from being necked in by sandwiching both ends of the molten resin film extruded from the T die between the T die and the coater roll, A method for producing a resin-coated metal plate.