JPH07251121A - Painting belt-like punching metal and continuous roll painting method therefor - Google Patents

Abstract

PURPOSE:To provide a painting punching metal at a low cost by which labor and time for work are reduced and also painting speed is increased to surely form a coating film on both front and rear surfaces and inner peripheral surfaces of a lot of holes. CONSTITUTION:Both the front and rear surfaces of a belt-like punching metal 1 having a lot of holes penetrating from the front to the rear are subjected to continuous roll painting at least with a resin coating material through an applicator roll consisting of elastic rolls 12A, 12B, allowing a coating film to be formed on each of both the front and rear surfaces of the punching metal 1 and the inner peripheral surfaces of a lot of the holes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation / sound cover such as a speaker grill or a radiator grill, a soundproof / heat insulating plate member such as a soundproof panel or a heat insulating panel, a steam vent inner wall of a microwave oven or a microwave oven door. Related to plate members for housing-related equipment such as sealer plates or filters for ventilation hoods, and plate members for interior and exterior construction such as partitions and displays or ceiling materials that are widely used in various industrial fields, and coating methods thereof It is a thing.

[0002]

2. Description of the Related Art Punching metal made of various metal plates such as steel plate, zinc iron plate, aluminum steel plate, zinc-aluminum alloy plated steel plate, and stainless steel plate is improved in durability and appearance by rust prevention. For this reason, not only the front and back surfaces, but also the inner peripheral surfaces of the numerous holes formed in the base material so as to penetrate the front and back surfaces are coated with a resin paint to form a coating film.

In order to obtain such a coated punching metal, in general, a large number of holes are drilled, and a punching metal having a predetermined size and shape corresponding to the intended use is processed, and then the processed punching metal is processed. A method has been adopted in which each individual product is coated by an electrodeposition coating method or an electrostatic coating method to form a coating film on both the front and back surfaces and the inner peripheral surface of the hole.

[0004]

In the case of the conventional coating film forming means as described above, the processed punching metal is electro-deposited or electrostatically coated individually, so that it is used for overhead coating, for example. Using a carrier,
Even if the machined punching metal is hung on this and automatic coating is performed, the machine for conveying processed punching metal is hung for each individual product, and the coated punching metal is also conveyed for individual coating. Not only does it take a lot of troublesome work to remove it from the equipment, but the overall coating speed is usually slow at about 1 to 5 m / min, which increases the coating cost, and these are the products of coating punching metal. Was a factor that increased costs.

The present invention has been made in view of the above-mentioned circumstances, and it is possible to reduce labor and labor, and to speed up the coating speed to realize a large reduction in product cost. It is an object of the present invention to provide a coated strip-shaped punching metal that can be applied and a coating method therefor.

[0006]

In order to achieve the above object, in the coated strip-shaped punching metal according to the invention of claim 1, resin coating is applied to both front and back surfaces of the strip-shaped punching metal having a large number of holes penetrating the front and back. By continuous roll coating via elastic rolls, coating films are formed on both the front and back surfaces of the punching metal and the inner peripheral surfaces of the large number of holes.

Further, the coated strip-shaped punching metal according to the invention of claim 2 is a continuous roll coating of a primer containing a rust preventive pigment through elastic rolls on both front and back surfaces of the strip-shaped punching metal having a large number of holes penetrating the front and back. And the resin coating is continuously roll-coated through elastic rolls on the front and back surfaces of the punching metal and the inner peripheral surfaces of the large number of holes to form coating films.

On the other hand, a continuous roll coating method for strip-shaped punching metal according to the invention of claim 3 comprises a step of applying a pretreatment for coating to a strip-shaped punching metal having a large number of holes penetrating the front and back, and the strip-shaped punching metal. While pressing in the longitudinal direction with an applicator roll made of an elastic roll and a backing roll made of a hard material and sending in the longitudinal direction, a step of press-coating a resin coating on the surface side of the punching metal via the applicator roll made of the elastic roll, and Then, a step of press-coating a resin coating on the back surface side of the punching metal via an applicator roll made of an elastic roll,
And a process of baking and drying the coating films on both the front and back sides.

According to a fourth aspect of the present invention, there is provided a continuous roll coating method for a band-shaped punching metal, wherein the band-shaped punching metal having a large number of holes penetrating the front and back thereof is subjected to a pretreatment for coating, and the band-shaped punching metal is applied. While pressing in the longitudinal direction with an applicator roll made of an elastic roll and a backing roll made of a hard material, a step of press-coating a primer on the surface side of the punching metal via the applicator roll made of the elastic roll, Subsequently, a step of press-coating a primer on the back side of the punching metal via an applicator roll made of an elastic roll,
A process of baking and drying the coating film on both the front and back sides, and pressing the strip-shaped punching metal with an applicator roll made of an elastic roll and a backing roll made of a hard material and feeding in the longitudinal direction, to the surface side of the punching metal. A step of press-coating a resin coating for topcoating via an applicator roll consisting of the elastic roll, and subsequently a step of press-coating a resin coating for topcoating on the back side of the punching metal via an applicator roll consisting of an elastic roll. And a step of baking and drying the coating films on both the front and back sides.

[0010]

According to the first and second aspects of the present invention, a belt-shaped punching metal is used as the object to be coated, and the resin coating is continuously roll-coated on both front and back surfaces of the belt-shaped punching metal. Punching metal that has been machined to a predetermined size and shape does not require the troublesome work of hanging or removing individual punching metal from the transport device, and continuous coating is possible, resulting in extremely high coating speed. The coating cost, and thus the cost of coating punching metal, can be reduced very quickly. Also,
By using an elastic roll as a roll for continuous coating, when coating resin coating on both the front and back sides, without damaging the coating layers on both sides, a part of the coating is punched from the front side and the back side respectively. It is possible to form a predetermined coating film on both the front and back surfaces of punching metal and on the inner peripheral surfaces of many holes by coating the entire inner peripheral surface of the hole by wrapping around the inner peripheral surface of the hole. .

Further, in the second aspect of the present invention, when the belt-shaped punching metal is continuously roll-coated with the primer containing the anticorrosive pigment on both front and back surfaces, the corrosion resistance can be further improved.

On the other hand, according to the inventions of claims 3 and 4, a strip-shaped punching metal is used, and after the strip-shaped punching metal is subjected to a pretreatment for coating, the strip-shaped punching metal is used as an applicator roll. While pinching with a backing roll and sending it, since the resin coating is continuously roll-coated from the surface side by an applicator roll consisting of an elastic roll, while eliminating the troublesome work such as in the case of the conventional coating method, It is possible to make the coating speed very fast by continuous coating, and to reduce the coating cost, and eventually the cost associated with improving the productivity of coating punching metal products. It can be sufficiently wrapped around the peripheral surface, and then only the applicator roll consisting of an elastic roll is pressed from the back side. Since the resin coating is applied to the back surface of the punching metal, a part of the coating material is introduced from the back surface side into the lower part of the inner peripheral surface of the hole without damaging the paint layer on the front surface side. It is possible to paint without leaving the entire peripheral surface.

In particular, as described in claim 4, after the pretreatment for coating and before the coating of the resin coating material for top coating, the primer is pressed and coated on the surface side of the band-shaped punching metal with an applicator roll made of an elastic roll. , Followed by a step of press-coating the primer with an applicator roll made of an elastic roll on the back side and a step of baking and drying the coating film on both the front and back sides, the primer is applied to the front and back of the band-shaped punching metal. It is possible to paint efficiently on all surfaces of both sides and the inner peripheral surface of a large number of holes, and it is possible to continuously and inexpensively manufacture coated punching metal products with excellent rust prevention and corrosion resistance.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of a coated strip-shaped punching metal according to an embodiment of the present invention, and FIG. 2 is a vertical sectional view thereof. As the strip-shaped punching metal 1 which is a base material of the coated strip-shaped punching metal 100, a steel plate or a zinc iron plate, Various metal plates such as aluminum steel plate, zinc-aluminum alloy plated steel plate, and stainless steel plate are used. The plate thickness is preferably about 0.4 to 1.6 mm in view of strength and weight.
The size of the large number of holes 2 formed so as to penetrate the front and back of the band-shaped punching metal 1 is 0.5 to 10.0 m.
Round or square holes are preferred. The reason is that if the thickness is less than 0.5 mm, the holes 2 are filled with the coating material at the time of coating, and the original function of the punching metal is lost, and if it exceeds 10.0 mm, the backing roll during coating (described later).
In addition to increasing the amount of dirt on the surface and increasing the number of flat parts to maintain the rigidity of the punching metal, in the case of natural coating (the flow of the line and the rotating direction of the applicator roll described later are synchronized), the coating on the flat parts This is because a roping phenomenon occurs in the. Furthermore, the aperture ratio is 30 to 6
The range of 0% is general.

Reference numerals 3 are coating films formed on both the front and back surfaces of the band-shaped punching metal 1 and on the inner peripheral surfaces of a large number of holes 2. The coating film 3 includes an inner primer layer 3A and an outer overcoat layer 3B. Consists of. The primer layer 3A contains 3 to 5 parts of a primer paint in which a rust preventive pigment such as strontium chromate is mixed in a solid content of a paint containing an epoxy or polyester resin as a main component in a range of 5 to 50%.
It is applied to a thickness of 12 μm (dry thickness). Here, if the thickness of the primer layer 3A is less than 3 μm, a sufficient rust preventive effect cannot be obtained, and if it exceeds 12 μm, processing performance may be deteriorated, and if it is 12 μm or less, a sufficient rust preventive effect may be obtained. As a result, the primer paint is wasted and uneconomical. In addition, when the mixing ratio of rust preventive pigments such as strontium chromate is less than 5%, the rust preventive effect is low, and when it exceeds 50%, the viscosity of the primer coating becomes high and the coating properties deteriorate.

The above-mentioned overcoat layer 3B is formed by coating a resin coating containing polyester, fluorine, acrylic, silicone resin or the like as a main component to a thickness (dry thickness) of 5 to 25 μm. Here, if the thickness of the overcoat layer 3B is less than 5 μm, there is no hiding power and the ground of the band-shaped punching metal 1 looks transparent, so that the coloring makeup effect when using a colored paint is lost. . On the other hand, if the thickness exceeds 25 μm, it becomes difficult to apply a uniform thickness in continuous roll coating, and the coating properties deteriorate. When a highly processable polyester such as linear polyester or a fluorine resin is used as the resin coating material, not only is the processability of the coating film excellent, but the coated strip punching metal 10
When post-processing 0, damage such as cracking of the coating film 3 can be suppressed.

FIG. 3 is a schematic configuration diagram of the entire coating equipment for embodying the coating method for obtaining the above-mentioned coated belt-shaped punching metal 100. In the figure,
4 is the band-shaped punching metal 1 wound in a roll
The feeding roller 5 for movably supporting the sheet from one end in the longitudinal direction thereof in the direction of the arrow a is rotatably supported so as to sequentially wind the coated strip-shaped punching metal 100, which has been coated and baked and dried, into a roll shape. A take-up roller, which is a belt-shaped punching metal and is provided in the vicinity of the take-up roller 5 and a plurality of bending guide rollers 6 that are appropriately arranged at an intermediate position between the two rollers 4 and 5. The belt-shaped punching metal 1 and the coating belt-shaped punching metal 100 are continuously moved in a line via a bridle roller 7 which is driven so as to adjust the tension of 100.

Reference numeral 8 denotes a pretreatment part for coating, which improves the corrosion resistance by degreasing the band-shaped punching metal 1 and removing deposits such as dust, and then performing surface treatments such as chromate treatment and zinc phosphate treatment. Plan. Reference numeral 9 denotes a primer coating device that continuously roll-coats the primer paint containing the anticorrosive pigment described above. The primer coating device 9 includes a surface coating device portion 9A that roll-coats the primer paint on the surface side of the band-shaped punching metal 1. Immediately after the surface coating, the back side coating device section 9B is provided for roll-coating the primer coating on the back side of the band-shaped punching metal 1.

The surface coating device section 9A is a coating tank 10A.
The primer paint P1 stored in the paint tank 10A is rotated by rotating a part of the outer peripheral surface of the primer paint P1.
11A for picking up the pick-up roll and the pick-up roll 11A which is brought into circumferential contact with the pick-up roll 11A and is driven and rotated by a driving device (not shown).
And an applicator roll 12A that press-paints the primer paint P1 that has been scooped up and transferred to the outer peripheral surface thereof onto the surface of the band-shaped punching metal 1, and is made of a hard material such as metal and is arranged to face the applicator roll 12A. The backing roll 13A is pressed against the back side of the band-shaped punching metal 1 and rotates, and the band-shaped punching metal 1 is pinched by the applicator roll 12A and the backing roll 13A and the punching metal 1 is line-transferred in the longitudinal direction. Is configured. The line speed at this time can be set in the range of 20 to 80 m / min, but it is desirable to set the line speed in the range of 30 to 50 m / min in order to uniformly coat the entire band-shaped punching metal 1. Here, if the line speed is less than 20 m / min, the line speed is too slow, and it becomes uneconomical due to an increase in coating cost.
If it exceeds min, paint leakage is likely to occur.

In the surface coating device section 9A,
In the case of a natural coat, the applicator roll 12A is driven so that the peripheral speed of the applicator roll 12A is in the range of 0.9 to 1.1, preferably 0.95 to 1.05 of the line speed. By performing feedback control via a computer based on the detection of the line speed by the bridle roller 7, it is possible to average the paint around the inner peripheral surface of the numerous holes 2 of the band-shaped punching metal 1 over the entire circumference. is there. Immediately after the coating operation position of the backing roll 13A, a doctor blade 14 for scraping off and removing the primer coating remaining on the outer peripheral surface of the backing roll 13A is provided over substantially the entire length of the backing roll 13A. As a result, it is possible to prevent the occurrence of shape defects and the like due to the uneven thickness of the paint during back surface coating. Further, the pressing force of the applicator roll 12A and the backing roll 13A against the band-shaped punching metal 1 may be set in the range of 50 to 350 g / mm in linear pressure, but preferably the viscosity of the primer coating P1 (Ford Cup No.
4: 100 to 300 (seconds), preferably 150
If set to 150 to 200 g / mm so as to adapt to the range (to 250 (seconds)), it is possible to improve the circulation of the primer coating to the inner peripheral surface of the hole 2.

On the other hand, the back surface coating device section 9B is rotated in a state in which a part of the outer peripheral surface is immersed in the paint tank 10B, so that the same primer paint as that stored in the paint tank 10B is stored. Pickup roll 1 for scooping up P1
1B and the primer coating P1 which is brought into circumferential contact with the pickup roll 11B, is driven and rotated by a drive device (not shown), is scooped up by the pickup roll 11B, and is transferred to the outer circumferential surface thereof.
And an applicator roll 12B that is pressure coated on the back surface of the. The applicator roll 12B in the back surface coating device section 9B is arranged so that the weight of the band-shaped punching metal 1 is applied thereto, so that the primer paint P1 can be evenly and uniformly applied to the back surface of the band-shaped punching metal 1. It

In FIG. 3, reference numeral 15 is a first baking / drying furnace, and the belt-shaped punching metal 1 coated with a primer coating is passed through the inside thereof to bake and dry both front and back surfaces. The baking temperature at this time is 180
It is set in the range of up to 250 ° C. Reference numeral 16 is a first cooling device arranged in the vicinity of the outlet of the first baking / drying furnace 15, and a water shower, a mist or the like is formed on the primer layer 3A (see FIG. 2) formed by baking and drying. Sprinkle with to cool down. 17 is the first squeeze roll,
Squeeze out the cooling water.

Reference numeral 18 denotes an overcoating coating device for continuously roll-coating the above-mentioned overcoating resin coating. The above-mentioned overcoating coating device 18, like the above-mentioned primer coating device 9, after the above-mentioned overcoating resin coating is primed. Surface coating device section 1 for roll coating on the surface side of the band-shaped punching metal 1a
8A and a back surface coating device section 18B that roll-coats the resin coating material for top coating on the back surface side of the band-shaped punching metal 1a immediately after its surface coating.

The surface coating device section 18A is rotated with the outer peripheral surface partly immersed in the paint tank 19A, whereby the top coating resin paint P2 stored in the paint tank 19A is rotated. Pick up roll 20A
Then, the top coating resin paint P2 which is brought into circumferential contact with the pickup roll 20A, is driven and rotated by a drive device (not shown), is scraped up by the pickup roll 20A, and is transferred to the outer peripheral surface of the belt-shaped punching metal 1
The applicator roll 21A that is pressed and coated on the primer layer 3A on the surface of a, and the backing that is made of a hard material such as metal and that is arranged to face the applicator roll 21A and that is pressed against the back side of the band-shaped punching metal 1a to rotate. The roll 22A and the applicator roll 21A
And the backing roll 22A, the strip-shaped punching metal 1a is pressed and the punching metal 1a is line-transferred in the longitudinal direction. Immediately after the coating position of the backing roll 22A, the doctor blade 23 for scraping off and removing the resin paint remaining on the outer peripheral surface of the roll 22A is installed on the backing roll 22A.
It is provided over substantially the entire length of A.

On the other hand, the back surface coating device section 18B is rotated in a state in which a part of the outer peripheral surface is immersed in the paint tank 19B, so that the same top coating as that described above is stored in the paint tank 19B. The pickup roll 20B for scraping up the resin coating P2, and the resin coating P2 which is brought into circumferential contact with the pickup roll 20B and is driven and rotated by a drive device (not shown) to be scraped up by the pickup roll 20B and transferred to the outer peripheral surface thereof. The strip-shaped punching metal 1a is composed of an applicator roll 21B which is pressed and coated on the primer layer 3A on the back surface thereof. In addition, the line speed and the applicator roll 2 in the coating device 18 for top coating
It is preferable that the set values of the peripheral speed of 1A and the pressing force of the applicator roll 21A and the backing roll 22A against the band-shaped punching metal 1a are set in the same range as the set values in the primer coating device 9.

Further, in FIG. 3, reference numeral 24 denotes a second baking / drying furnace, which passes through a band-shaped punching metal 1a coated with a resin paint to bake and dry both front and back surfaces. The baking temperature at this time is 1
It is set in the range of 80 to 250 ° C. Reference numeral 25 is a second cooling device arranged in the vicinity of the outlet of the second baking / drying furnace 24, and a water shower, a mist or the like is added to the above-mentioned top coat layer 3B (see FIG. 2) formed by baking and drying. Sprinkle with to cool down. Reference numeral 26 denotes a second squeeze roll, which squeezes and removes the cooling water and guides the product coated strip-shaped punching metal 100 to the bridle roll 7.

In the coating equipment having the above structure, the applicator rolls 12A and 12B in the primer coating device 9
As the applicator rolls 21A and 21B in the top coater 18, elastic rolls such as urethane (Shore hardness Hs: 50 to 60) and NBR (nitrile butyl rubber, Hs: 35 to 45) are used. .

Next, the coating operation by the coating equipment having the above-mentioned structure will be briefly described. First, the feeding roller 4
The strip-shaped punching metal 1 sequentially fed out from the above is introduced into the pretreatment section 8 and subjected to degreasing, removal of deposits such as dust, and surface treatment such as chromate treatment and zinc phosphate treatment to improve its corrosion resistance. Then, it is transferred to the surface coating device section 9A of the primer coating device 9 and the applicator roll 12A made of an elastic roll applies the rust preventive pigment-containing primer paint P1 on the surface side of the belt-shaped punching metal 1. Here, since the line speed and the peripheral speed of the applicator roll 12A are substantially equal to each other, as clearly shown in FIG.
The inner peripheral surface of the hole 2 of the band-shaped punching metal 1 is evenly coated.

The belt-shaped punching metal 1 whose primer coating has been completed is subsequently transferred to the back-coating device section 9B of the primer coating device 9 by a line, and the back side of the belt-shaped punching metal 1 is applied by an applicator roll 12B made of an elastic roll. Then, a primer coating P1 containing a rust preventive pigment similar to the above is roll coated. With this roll coating of the back surface, as clearly shown in FIG. 5, the remaining inner peripheral surface of the hole 2 of the band-shaped punching metal 1 is coated.

The strip-shaped punching metal 1 on which the roll coating of the primer coating P1 is completed on both the front and back surfaces and the entire inner peripheral surface of the plurality of holes 2 is line-transferred so as to pass through the inside of the first baking / drying furnace 15. The front and back surfaces are both baked and dried to form a primer layer 3A as shown in FIG. After that, in the vicinity of the outlet of the first baking / drying furnace 15, the primer layer 3A is sprinkled with a water shower or a mist to be forcibly cooled, and the cooling water is squeezed and removed by the squeezing roll 17. The primer coating is completed by the above steps.

Next, the strip-shaped punching metal 1a on which the primer coating has been completed is transferred to the surface coating device section 18A of the top coating device 18 by a line and is applied to the surface of the strip-shaped punching metal 1a by an applicator roll 21A made of an elastic roll. Resin coating P2 for top coating on the primer layer 3A
Is roll coated. Also here, since the line speed and the peripheral speed of the applicator roll 12A are equal, as shown in FIG. 6, the inner peripheral surface of the hole 2 of the band-shaped punching metal 12 is overcoated with the roll coating on this surface. The resin paint P2 will be applied uniformly.

The strip-shaped punching metal 1a on which the surface top-coating has been completed is subsequently transferred to the back-side coating device section 18B of the top-coating coating device 18 by a line and is applied to the back surface of the strip-shaped punching metal 1a by an applicator roll 21B made of an elastic roll. On top of the primer layer 3A, the same top coating resin paint P2 as described above is roll coated. Along with the roll coating of the back surface, as clearly shown in FIG. 7, the resin coating P for top coating is applied to the rest of the inner peripheral surface of the hole 2 of the band-shaped punching metal 1a.
2 will be painted.

The belt-shaped punching metal 1a, on which the roll coating of the resin coating material P2 for overcoating is completed on both the front and back surfaces and the entire inner peripheral surface of the many holes 2, is transferred to the line so as to pass through the inside of the second baking and drying furnace 24. Then, both the front and back surfaces are baked and dried to form an overcoat layer 3B as shown in FIG. After that, in the vicinity of the outlet of the second baking / drying furnace 24, the upper coating layer 3B is sprinkled with a water shower, mist or the like to be forcibly cooled, and the cooling water is squeezed out by the squeezing roll 26. By the above steps, the overcoating is completed, and as shown in FIGS. 1 and 2, a coating strip punching in which two layers of coating film 3 are formed on each of the front and back surfaces and on the inner peripheral surfaces of a large number of holes 2. Metal 100 is obtained. The coated belt-shaped punching metal 100 is wound around the winding roller 5 in a roll shape.

In the above embodiment, the case where the coating film 3 is formed by two layers of the primer layer 3A and the overcoat layer 3B has been described. However, even if the resin coating described above is applied only once. Of course, it is sufficient to set the thickness (dry thickness) at this time to the range of 5 to 25 μm as in the case of double coating.

Further, as the roll coating method, the natural coat is adopted in the above embodiment, but the reverse coat may be adopted. That is, the applicator rolls 12A, 21A on the front surface side are reverse coated, the peripheral speed is 1.2 to 1.3 times the line speed, and the applicator rolls 12B, 21B on the back surface side are natural coated. By setting the peripheral speed to be equal to or higher than the line speed, as shown in FIGS. 8 and 9, it is possible to coat without leaving the entire inner peripheral surface of the hole 2.

Next, an experimental example by the present inventor will be described. Holes 2 with a diameter d of 1.5 mm and a pitch P of 2 mm,
Using a punching metal made of zinc-plated steel sheet with a thickness of 0.6 mm and having a large opening ratio of 50.9%, this punching metal was chromated (pre-treated), and strontium chromate as a rust preventive pigment was added to the coating solid content. Epoxy resin primer coating compounded so as to be 25% is applied to both front and back surfaces of punching metal by natural roll coating to a thickness of 5 to 7 μm (dry thickness), and
It is baked and dried at a temperature of 210 ° C., then a polyester resin coating is applied on it by natural roll coating to a thickness (dry thickness) of 14 to 16 μm, and baked and dried at a temperature of 230 ° C. Got painted punching metal. The line speed at this time is 30m / mi.
set to n.

From the coated punched metal obtained as described above, six test pieces having a length of 150 mm and a width of 70 mm were taken, and cross cuts having a length of 100 mm were put into the test pieces, and the test pieces were exposed to 50 ° C. and 95% humidity. 2 in the atmosphere
As a result of performing a moisture resistance test of leaving for 4 hours, no abnormality was found in the coating films on both the front and back surfaces and the inner peripheral surface of the hole 2. Incidentally, the moisture resistance standard of punching metal used as an interior / exterior material in home electric appliances related equipment such as a microwave oven, a fan heater, an oven toaster is generally about 170 hours, and the punching metal according to the present invention is sufficiently standardized. I found that I could clear it.

In addition, for the above test piece, J
As a result of performing a prescribed workability test on IS G3312, no peeling of the coating film was visually observed even when bent by 0T. Therefore, it was found that the rust preventive effect and the appearance were not deteriorated due to the peeling of the coating film during the post processing.

[0039]

As described above, according to the first and second aspects of the present invention, the resin coating material is continuously roll-coated on both the front and back surfaces of the band-shaped punching metal as an object to be coated. The punching metal that has been processed into a shape does not require the troublesome work of hanging and removing the punching metal for each individual item from the transporting device, and the coating speed is very fast, which results in coating cost and eventually coating punching metal. The cost can be reduced. Moreover, with the use of elastic rolls, the coating layers on both the front and back sides are not damaged, and part of the coating is squeezed from the front surface side and the back surface side to the inner peripheral surface side of the hole to cover the entire inner peripheral surface of the hole. It is possible to obtain a high-performance coated punching metal in which a predetermined coating film is surely formed on both the front and back surfaces and the inner peripheral surfaces of a large number of holes by coating without leaving. In addition, claim 2
As described above, in the case where the rust-preventive pigment-containing primer is continuously roll-coated on both sides of the band-shaped punching metal, the corrosion resistance can be further improved.

On the other hand, according to the inventions of claims 3 and 4, after the belt-shaped punching metal is subjected to a pretreatment for coating, the belt-shaped punching metal is pressed by an applicator roll and a backing roll and fed. However, since the resin coating is continuously roll-coated from the surface side by an applicator roll consisting of elastic rolls, continuous coating can be applied at extremely high coating speeds without the need for the troublesome work involved in conventional coating methods. In addition to being able to reduce the coating cost and the cost associated with improving the productivity of coated punching metal products, the resin coating that is pressed against the surface and wraps well around the inner surface of the hole. After that, only the applicator roll consisting of elastic rolls is pressed from the back side and the resin is applied to the back side of the punching metal. Since the paint is applied, part of the paint is introduced from the back side into the lower part of the inner peripheral surface of the hole without damaging the paint layer on the front side, and the entire inner peripheral surface of the hole is not left behind. can do. In particular, as in claim 4, after the pretreatment for coating and before the coating of the resin coating for topcoating, the primer is pressed and coated on the surface side of the band-shaped punching metal with an applicator roll made of an elastic roll, and subsequently, In the case where there is a step of press-coating the primer with an applicator roll consisting of an elastic roll on the back side and a step of baking and drying the coating film on both the front and back sides, It is possible to coat the entire inner peripheral surface of the hole efficiently and without leakage, and it is possible to inexpensively continuously produce a coated punched metal product having excellent rust prevention and corrosion resistance.

[Brief description of drawings]

FIG. 1 is a plan view of an essential part of a coated strip-shaped punching metal according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a main part of the above coated strip-shaped punching metal.

FIG. 3 is a schematic configuration diagram of the entire coating facility for embodying the coating method according to the present invention.

FIG. 4 is an enlarged cross-sectional view of a main part showing a coating state of the inner peripheral surface of the hole in a state where the primer coating is naturally coated on the surface of the punching metal in the coating operation.

FIG. 5 is an enlarged cross-sectional view of an essential part showing a coating state of the inner peripheral surface of the hole in a state where the primer coating is naturally coated on the back surface of the punching metal in the coating operation.

FIG. 6 is an enlarged cross-sectional view of a main part showing a coating state of the inner peripheral surface of the hole in a state where the resin coating material for top coating is naturally coated on the surface of the punching metal in the coating operation.

FIG. 7 is an enlarged cross-sectional view of a main part showing a coating state of the inner peripheral surface of the hole in a state in which the back surface of the punching metal is naturally coated with the resin coating material for top coating in the coating operation.

FIG. 8 is an enlarged cross-sectional view of a main part showing a coating state of the inner peripheral surface of the hole in a state where the top coating resin paint is reversely coated on the surface of the punching metal in another embodiment of the coating method.

FIG. 9 is an enlarged cross-sectional view of a main part showing a coating state of the inner peripheral surface of the hole in a state where the back coating of the punching metal is naturally coated with the resin coating for top coating by the same coating method.

[Explanation of symbols]

 1,1a Band-shaped punching metal 2 Holes 3 Coating film 3A Primer layer 3B Topcoat layer 8 Pretreatment part for coating 9 Primer coating device 12A, 12B, 21A, 21B Applicator roll 13A, 22A Backing roll 15, 24 Baking drying furnace P1 primer Paint P2 Resin paint for top coating

Claims (4)

[Claims] 1. A belt-shaped punching metal having a large number of holes penetrating through the front and back is continuously roll-coated with a resin coating through elastic rolls, so that both the front and back surfaces of the punching metal and the large number of holes. Painted band-shaped punching metal with coating film formed on the peripheral surface. 2. A primer containing a rust preventive pigment is continuously roll-coated on both front and back surfaces of a belt-shaped punching metal having a large number of holes penetrating the front and back, and a resin coating is coated on the elastic roll with a primer. A coated strip-shaped punching metal in which coating films are formed on both the front and back surfaces of the punching metal and the inner peripheral surfaces of the plurality of holes by continuous roll coating. 3. A step of subjecting a band-shaped punching metal having a large number of holes penetrating to the front and back to a pretreatment for coating, and pressing the band-shaped punching metal with an applicator roll made of an elastic roll and a backing roll made of a hard material. And pressurizing the resin coating on the front side of the punching metal via the applicator roll consisting of the elastic roll, and then applying the applicator roll consisting of the elastic roll to the back side of the punching metal. A continuous roll coating method for band-shaped punching metal, which comprises a step of press-coating a resin coating material via a sheet and a step of baking and drying both coating films on both front and back sides. 4. A step of applying a pretreatment for coating to a band-shaped punching metal having a large number of holes penetrating the front and back, and pressing the band-shaped punching metal with an applicator roll made of an elastic roll and a backing roll made of a hard material. And pressurizing the primer on the front surface side of the punching metal via the applicator roll made of the elastic roll, and then applying the applicator roll made of the elastic roll to the back side of the punching metal. Step of pressing the primer through, the step of baking and drying the coating film on both front and back surfaces, and pressing the strip-shaped punching metal with an applicator roll made of an elastic roll and a backing roll made of a hard material in the longitudinal direction. While feeding, the applicator roll consisting of the elastic roll is placed on the surface side of the punching metal. And a step of press-coating the top-coating resin coating on the back side of the punching metal via an applicator roll consisting of an elastic roll, and a coating on both front and back sides. A continuous roll coating method for strip-shaped punching metal, which comprises the steps of baking and drying the film together.