JP3160457B2 - Painted strip-shaped punching metal and continuous roll coating method - Google Patents

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 sound / heat insulating plate member such as a soundproof panel or a heat insulating panel, a steam vent inner wall of a microwave oven and a door of a microwave oven. The present invention relates to a coated band-shaped punching metal widely used in various industrial fields such as a plate member for housing-related equipment such as a sealer plate or a filter of a ventilation hood, and a partition member, a plate member for a building or exterior such as a display or a ceiling material, and a coating method thereof. Things.

[0002]

2. Description of the Related Art Punched metal based on various metal plates, such as steel plates, galvanized steel plates, aluminum steel plates, zinc-aluminum alloy-plated steel plates, and stainless steel plates, has improved durability and appearance by preventing rust. Therefore, not only on the surface but also on the inner peripheral surface of a large number of holes formed in the base material so as to penetrate the front and back sides, a resin paint is applied to form a coating film.

[0003] In order to obtain such a coated punching metal, conventionally, in general, a large number of drilling processes are performed, and at the same time, the processed punching metal is processed into a punching metal having a predetermined size and shape corresponding to a use. Means of forming a coating film on both the front and back surfaces and the inner peripheral surface of the hole by applying an electrodeposition coating or an electrostatic coating method for each single item has been adopted, but in this case, for example, an overhead type coating transfer device Even if automatic painting is performed by using such a method, it is necessary to suspend the machined punched metal in the painting transfer device for each product and remove the painted punched metal from the painting transfer device for each product. Not only does it take time and labor, but also the overall coating speed is usually as low as 1 to 5 m / min, which increases the coating cost. Luo made to increase factor of the cost of painting punching metal is a product.

In view of this, a so-called continuous roll coating means is conceivable in which a strip-shaped punching metal is pressed by a roll and fed, and the coating material is coated by the roll. According to this continuous roll coating means, it is possible to save labor by eliminating troublesome work such as in the case where the above-described processed punching metal is subjected to electrodeposition coating or electrostatic coating for each item, and to considerably increase the coating speed. Is possible,
The coating cost can be reduced.

[0005]

However, in the above continuous roll coating means, in the case of a small hole equivalent to a diameter of 0.5 to 3 mm, paint is applied to both the front and back surfaces of the band-shaped punching metal 1 as shown in FIG. At the time of painting, the paint does not easily flow into the hole 2, and the coating film 3 hangs down at the entrance of the hole 2 and dries while remaining slightly, resulting in the performance of the product as a punching metal. It was prone to defects.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and can reduce labor and labor, can increase the coating speed, and can achieve a significant reduction in product cost. Moreover, it is an object of the present invention to provide a coated strip-shaped punching metal capable of improving the performance and quality by coating the inner peripheral surface of the hole without a film beam, and a coating method thereof.

[0007]

In order to achieve the above-mentioned object, a coated strip-shaped punched metal according to the first aspect of the present invention is a strip-shaped punched metal having a large number of holes corresponding to a diameter of 0.5 to 3 mm penetrating from front to back. At least on the surface of the punching metal,
By applying a paint prepared by mixing 1 to 10% by weight of an antifoaming agent with respect to 100 parts by weight of the whole resin paint through an elastic roll, at least the surface of the punched metal and the above-mentioned many holes Each is formed by forming a coating film on the peripheral surface.

The coated strip-shaped punching metal according to the invention of claim 2 is characterized in that a primer is provided with an elastic roll on at least the surface of the strip-shaped punching metal having a large number of holes having a diameter of 0.5 to 3 mm penetrating from front to back. By continuous roll coating via a resilient roll, and a continuous roll coating via a resilient roll with a coating composition containing 1 to 10% by weight of an antifoaming agent based on 100 parts by weight of the total resin coating. A coating film is formed on at least the surface of the punching metal and on the inner peripheral surfaces of the plurality of holes.

On the other hand, in the continuous roll coating method for a band-shaped punching metal according to the invention of claim 3, a pretreatment for coating is performed on a band-shaped punching metal having a large number of holes corresponding to a diameter of 0.5 to 3 mm penetrating from front to back. And applying a coating obtained by blending 1 to 10% by weight of an antifoaming agent with respect to 100 parts by weight of the total resin coating on at least the surface of the band-shaped punching metal via an applicator roll composed of an elastic roll. Baking and drying treatment.

Further, in the continuous roll coating method for a band-shaped punching metal according to the invention of claim 4, a pretreatment for coating is performed on a band-shaped punching metal having a large number of holes having a diameter equivalent to 0.5 to 3 mm penetrating from front to back. Applying, applying a primer on at least the surface of the strip-shaped punching metal via an applicator roll made of an elastic roll, and baking and drying the same. Subsequently, 100 wt. 1 to 10 per part
Press-coating a paint containing a weight percent of an antifoaming agent via an applicator roll composed of an elastic roll, and baking and drying.

[0011]

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 a coating material is applied to the belt-shaped punching metal by continuous roll coating via an elastic roll. This eliminates the need for hanging the punched metal that has been machined to the specified size and shape on a single transfer unit and removing it from the transfer unit, as well as the need for troublesome work. It is very fast, and it is possible to reduce the cost of painting, and thus the cost of painted punched metal. In addition, the use of an elastic roll and the use of a paint prepared by blending 1 to 10% by weight of an antifoaming agent with respect to 100 parts by weight of the total resin paint make it possible to form a paint layer on both surfaces when applying the paint on the surface. Without damaging the paint, a part of the paint is allowed to enter the inner peripheral surface of the hole from the surface side, and the fluidity of the paint is increased. Even with a punching metal having a large number of holes having a diameter of 0.5 to 3 mm, a predetermined coating film can be formed on the surface and the inner peripheral surface of the large number of holes without causing a film beam.

[0012] In particular, when the primer is continuously roll-coated on the surface of the belt-shaped punching metal via an elastic roll before applying the paint containing the defoaming agent as in claim 2, the film beam is formed. Of course, the improved corrosion resistance results in very high product performance and quality.

According to the third and fourth aspects of the present invention, a band-shaped punching metal is used, and after the band-shaped punching metal is subjected to a pre-coating treatment, the entire surface of the band-shaped punching metal is coated. A paint prepared by blending 1 to 10% by weight of an antifoaming agent with respect to 100 parts by weight of a resin paint is subjected to press-coating through an applicator roll formed of an elastic roll and baking and drying. In addition to the need for complicated work such as the case described above, the coating speed can be made extremely fast by continuous coating, and the coating cost and, consequently, the cost reduction accompanying the improvement in the productivity of the coated punched metal product can be achieved. In order to increase the fluidity of the paint, a part of the paint that has been painted by pressing against the surface enters the hole from the surface side. Even if it is a punched metal having a large number of holes having a diameter of 0.5 to 3 mm, it is easy to wrap around the entire inner peripheral surface, and a predetermined amount is formed on the surface and the inner peripheral surface of the large number of holes without causing a film beam. It is possible to form a coating.

In particular, after the pretreatment for coating and before the coating of the paint containing the antifoaming agent, the surface of the band-shaped punching metal is applied via an applicator roll made of an elastic roll. When the primer is pressed and baked and dried, the primer can be efficiently applied to the surface of the band-shaped punching metal and the inner peripheral surface of a large number of holes, and a film beam is formed on the primer layer. Rust prevention and rust prevention
It is possible to produce inexpensively a painted punched metal product which is not only excellent in corrosion resistance but also excellent in the original function of the punched metal.

[0015]

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 punched metal according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of the strip-shaped punched metal. Various metal plates such as an aluminum steel plate, a zinc-aluminum alloy-plated steel plate, and a stainless steel plate are used, and a suitable plate thickness is about 0.4 to 1.6 mm in view of strength, weight, and the like.
In addition, a number of holes 2 are formed in the band-shaped punching metal 1 so as to penetrate the front and back surfaces thereof. The size of these many holes 2 is preferably 0.5 to 3.0 mm round or square holes. The reason is that if it is less than 0.5 mm, a film beam phenomenon occurs in the hole 2 at the time of painting, the original function of the punched metal is lost, and if it exceeds 3.0 mm, the film beam phenomenon does not occur originally. Because. Further, the aperture ratio is generally in the range of 20 to 60%.

Reference numeral 3 denotes a coating film formed on each of the front and back surfaces of the band-shaped punching metal 1 and the inner peripheral surface of the plurality of holes 2. The coating film 3 comprises an inner primer layer 3A and an outer top coating layer 3B. Consists of The primer layer 3A contains a primer paint in which a rust preventive pigment such as strontium chromate is mixed in a range of 5 to 50% in a solid content of a paint mainly containing epoxy or polyester resin.
It was painted 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-preventing effect cannot be obtained. If the thickness exceeds 12 μm, there is a possibility that the processing performance may be deteriorated. The resulting primer paint is wasteful and uneconomical. Further, when the mixing ratio of the rust-preventive pigment such as strontium chromate is less than 5%, the rust-preventing effect is low, and when it exceeds 50%, the viscosity of the primer paint becomes high and the paintability deteriorates. It should be noted that the primer paint does not cause film sticking even if the defoaming agent is not added in a large amount as in the case of top coat. This is presumably due to the fact that a large amount of pigment such as a rust-preventive pigment is blended and that the coating is applied with a relatively low viscosity.

The above-mentioned overcoat layer 3B is 1 to 10 parts by weight based on 100 parts by weight of the total resin paint obtained by mixing a solvent, a pigment and other additives into a resin paint mainly composed of polyester, fluorine, acrylic, silicone resin or the like. A coating containing a defoaming agent in an amount of 5% by weight was applied to a thickness (dry thickness) of 5 to 25 μm. Here, the thickness of the overcoat layer 3B is 5 μm.
If the value is less than the above, there is no hiding power and the ground of the band-shaped punching metal 1 can be seen through, so that the coloring cosmetic effect when using the coloring paint is lost. Also, if the thickness is 2
If it exceeds 5 μm, it becomes difficult to apply a uniform thickness in roll coating, and the coating properties deteriorate.

As the defoaming agent to be added to the above-mentioned paints, those which react well with resin paints and pigments and are effective as surfactants are suitable. Representative examples thereof include acrylic ester compounds. And an organically modified polysiloxane compound. The compounding amount of this defoamer is in the range of 1 to 10% by weight, preferably in the range of 2 to 6% by weight, based on 100 parts by weight of the total resin paint. The reason is that if the amount is less than 1% by weight, a film beam is formed in a small hole corresponding to a diameter of 0.5 to 3.0 mm. Is inappropriate. Conventionally, defoamers are
In order to eliminate bubbles when the paint is agitated, it is used in a paint of about 0.1 to 0.8%, but it is not known that this is effective in preventing film sticking.

FIG. 3 is a schematic diagram of the entire coating equipment that embodies a coating method for obtaining the above-described coated strip-shaped punched metal 100. As shown in FIG. In the figure,
4 is the strip-shaped punched metal 1 wound in a roll shape
The roller 5, which is rotatably supported from one end in the longitudinal direction thereof in the direction of the arrow a, is rotatably supported so that the coated strip-shaped punched metal 100, which has been coated, baked and dried, is sequentially wound into a roll. A take-up roller, a plurality of bending guide rollers 6 suitably disposed at an intermediate position between the two rollers 4 and 5, and a coating strip-shaped punching metal disposed near the take-up roller 5; The band-shaped punching metal 1 and the coating band-shaped punching metal 100 are continuously moved in a line via a bridle roller 7 driven so as to adjust the tension of 100.

Reference numeral 8 denotes a pre-treatment section for coating, which removes deposits such as dust from the strip-shaped punching metal 1 and then performs surface treatment such as chromate treatment and zinc phosphate treatment to improve corrosion resistance. Plan. Reference numeral 9 denotes a primer coating apparatus for continuously rolling the above-mentioned primer paint containing the rust-preventive pigment. The primer coating apparatus 9 includes a surface coating device section 9A for roll-coating the primer paint on the surface side of the strip-shaped punching metal 1. Immediately after the front surface coating, the back side of the belt-shaped punching metal 1 is coated with a primer coating material by roll coating.

The above-mentioned surface coating unit 9A includes a coating tank 10A.
By rotating with a part of the outer peripheral surface immersed therein, the primer paint P1 stored in the paint tank 10A is rotated.
Roll 11A that scrapes the pick-up roll 11A, and is brought into contact with the peripheral surface of the pick-up roll 11A and driven and rotated by a driving device (not shown) to rotate the pick-up roll 11A.
An applicator roll 12A that presses the surface of the band-shaped punching metal 1 with the primer paint P1 scooped up and transferred to the outer peripheral surface thereof, and a hard material such as a metal, which is disposed to face the applicator roll 12A. The applicator roll 12A and the backing roll 13A press the band-shaped punching metal 1 to transfer the punching metal 1 in the longitudinal direction. It is configured as follows. The line speed at this time can be in the range of 20 to 80 m / min, but is desirably set in the range of 30 to 50 m / min from the viewpoint of uniformly coating the entire band-shaped punched metal 1. Here, if the line speed is less than 20 m / min, the line speed is too low, and it is not economical due to an increase in coating cost, and the line speed is 80 m / min.
If it exceeds min, paint leakage is likely to occur.

In the above-described surface coating device 9A, the peripheral speed of the applicator roll 12A is a line speed of 0.9 to 1.1, preferably 0.95 to 1.05 in the case of a natural coat. The drive of the applicator roll 12A is feedback-controlled via a computer based on the detection of the line speed by the bridle roller 7 so as to fall within the range, so that the inner circumference of the plurality of holes 2 of the band-shaped punching metal 1 is controlled. It is possible to average the circumference of the paint on the surface over the entire circumference. Immediately after the coating position of the backing roll 13A, a doctor blade 14 for scraping off and removing the primer paint remaining on the outer peripheral surface of the backing roll 13A is provided over substantially the entire length of the backing roll 13A. Accordingly, it is possible to prevent the primer paint adhered to the backing roll 13A from adhering to the back surface of the punching metal 1 and to prevent the occurrence of shape defects and the like due to the uneven thickness of the paint at the time of the back face painting. . 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 a range of 50 to 350 g / mm in linear pressure, but preferably the viscosity of the primer paint P1 (Ford Cup No.
4: within the range of 100 to 300 (seconds), preferably 150
If it is set to 150 to 200 g / mm so as to conform to the range (to be set in the range of 250 to (seconds)), it is possible to improve the circulation of the primer paint to the inner peripheral surface of the hole 2.

On the other hand, the back coating device 9B is rotated while a part of its outer peripheral surface is immersed in the paint tank 10B, so that the same primer paint stored in the paint tank 10B as described above. Pickup roll 1 for scraping P1
1B and a belt-shaped punching metal 1 which is brought into contact with the pick-up roll 11B and is driven and rotated by a driving device (not shown), is scooped up by the pick-up roll 11B and transferred to the outer circumferential surface thereof.
And an applicator roll 12B for press-coating the back surface of the sheet. The applicator roll 12B in the back surface coating unit 9B is arranged so that the weight of the band-shaped punching metal 1 is applied, whereby the back surface of the band-shaped punching metal 1 can be uniformly coated with the primer paint P1. You.

In FIG. 3, reference numeral 15 denotes a first baking / drying furnace, in which the front and back surfaces are baked and dried by passing a band-shaped punching metal 1 coated with a primer paint therein. The baking temperature at this time is 180
It is set in the range of -250 ° C. Reference numeral 16 denotes a first cooling device arranged near the outlet of the first baking / drying furnace 15, and a water shower, a mist, or the like is applied to the above-described primer layer 3A (see FIG. 2) formed by baking and drying. And forcibly cool. 17 is a first squeezing roll,
Squeeze out the cooling water.

Reference numeral 18 denotes an overcoating apparatus for continuous roll coating of an overcoating composition containing the above-described antifoaming agent. The overcoating apparatus 18 is the same as the above-described primer coating apparatus 9. A surface coating unit 18A for roll-coating the coating material on the front side of the band-shaped punching metal 1a after the primer treatment, and a back-coating unit 18B for roll-coating the top coating material on the back side of the band-shaped punching metal 1a immediately after the surface coating. It is composed of

The surface coating device 18A is rotated while a part of its outer peripheral surface is immersed in the paint tank 19A, thereby scraping the top coating paint P2 stored in the paint tank 19A. A pickup roll 20A to fry,
The top coating material P2, which is in contact with the peripheral surface of the pickup roll 20A, is driven and rotated by a driving device (not shown), is scooped up by the pickup roll 20A, and is transferred to the outer peripheral surface thereof. An applicator roll 21A to be pressed and coated on the upper side, and a band-shaped punching metal 1 made of a hard material such as metal and arranged to face the applicator roll 21A.
backing roll 22 pressed against the back side of
The applicator roll 21A and the backing roll 22A press the band-shaped punching metal 1a to transport the punching metal 1a in the longitudinal direction. Immediately after the coating operation position of the backing roll 22A, a doctor blade 23 for scraping off and removing the resin paint remaining on the outer peripheral surface of the backing roll 22A is provided similarly to the primer coating apparatus.

On the other hand, the back-coating unit 18B is rotated while a part of its outer peripheral surface is immersed in the paint tank 19B, so that the same overcoating as that described above stored in the paint tank 19B is performed. A pick-up roll 20B for scraping the paint P2, and a belt-shaped punching of the paint P2 which is brought into peripheral contact with the pick-up roll 20B, driven and rotated by a driving device (not shown), scooped up by the pick-up roll 20B and transferred to the outer peripheral surface. And an applicator roll 21B for press-coating the primer layer 3A on the back surface of the metal 1a. The set values of the line speed, the peripheral speed of the applicator roll 21A, and the pressing force of the applicator roll 21A and the backing roll 22A against the strip-shaped punching metal 1a in the overcoating coating device 18 are the same as those in the primer coating device 9 described above. It is preferable to set the same range.

In FIG. 3, reference numeral 24 denotes a second baking / drying furnace, in which the front and back surfaces are baked and dried by passing a band-shaped punching metal 1a coated with paint through the furnace. The baking temperature at this time is 180
It is set in the range of -250 ° C. Reference numeral 25 denotes a second cooling device arranged near the outlet of the second baking / drying furnace 24, and a water shower, a mist or the like is applied to the above-mentioned overcoat layer 3B (see FIG. 2) formed by baking and drying. And forcibly cool. Reference numeral 26 denotes a second squeezing roll which squeezes and removes cooling water and guides the coated strip-shaped punching metal 100 as a product to the bridle roll 7.

In the coating equipment having the above configuration, each applicator roll 12A, 12B in the primer coating apparatus 9 is used.
As the applicator rolls 21A and 21B in the overcoating device 18, elastic rolls such as urethane (Shore hardness Hs: 50 to 60) and NBR (nitrile butyl rubber, Hs: 35 to 45) are used. It is desirable because the paint around the inner peripheral surface is good.

Next, a brief description will be given of a painting operation performed by the painting equipment having the above-described configuration. First, the feeding roller 4
The strip-shaped punching metal 1 sequentially fed out from the preform 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 surface side of the strip-shaped punching metal 1 is roll-coated with the primer paint P1 containing the rust-proof pigment by the applicator roll 12A made of an elastic roll. Here, since the line speed and the peripheral speed of the applicator roll 12A are set to be equal in the natural coat, as shown in FIG.
The inner peripheral surface of the hole 2 will be painted.

The band-shaped punching metal 1 whose surface has been subjected to the primer coating is then transferred to the back-coating unit 9B of the primer coating apparatus 9 by a line, and is applied to the back side of the band-shaped punching metal 1 by an applicator roll 12B composed of an elastic roll. Then, the same primer paint P1 containing a rust-preventive pigment as described above is roll-coated. With the roll coating of the back surface, as shown in FIG. 5, the remaining portion of the inner peripheral surface of the hole 2 of the band-shaped punching metal 1 is painted.

The belt-shaped punching metal 1 on which the primer coating P1 has been roll-coated over both the front and back surfaces and the entire inner peripheral surface of the large number of holes 2 is transferred by a line so as to pass through the inside of a first baking / drying furnace 15. The front and back surfaces are baked and dried to form a primer layer 3A as shown in FIG. Thereafter, at a position near the outlet of the first baking / drying furnace 15, a water shower or mist is sprinkled on the primer layer 3 </ b> A 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 unit 18A of the top-coating coating device 18 by a line, and is applied to the surface of the strip-shaped punching metal 1a by an applicator roll 21A composed of an elastic roll. The top coat P2 is roll-coated on the primer layer 3A. At this time, since an appropriate amount of an antifoaming agent is blended in the top coating material P2, the fluidity of the coating material P2 is improved, and the coating material P2 coated so as to block the entrance of the hole 2 Will be enough to go around. even here,
Since the line speed and the peripheral speed of the applicator roll 12A are set to be equal in the natural coat, the inner periphery of the hole 2 of the band-shaped punching metal 12, as shown in FIG. The paint P2 for top coat is applied to the surface.

The band-shaped punching metal 1a having completed the topcoating on the front surface is then transferred to the backside coating device 18B of the topcoating device 18 by a line, and is applied to the backside of the band-shaped punching metal 1a by an applicator roll 21B composed of an elastic roll. An overcoating paint P2 similar to the above is roll-coated on the primer layer 3A. Along with this roll coating on the back surface, as shown in FIG. 7, the remaining coating on the inner peripheral surface of the hole 2 of the band-shaped punching metal 1a is coated with the top coating paint P2.

The strip-shaped punching metal 1a, which has been roll-coated with the top coating P2 over both the front and back surfaces and the entire inner peripheral surface of the large number of holes 2, is transferred to the line so as to pass through the inside of the second baking / drying furnace 24. Then, the front and back surfaces are baked and dried to form an overcoat layer 3B as shown in FIG. Thereafter, at a position near the outlet of the second baking / drying furnace 24, a water shower, a mist, or the like is sprinkled on the overcoat layer 3B to forcibly cool the upper coating layer 3B.
6, the cooling water is squeezed and removed. Through the above steps, the top coat is completed, and as shown in FIGS.
A coated strip-shaped punching metal 100 having the layer coating film 3 formed thereon is obtained. This painted strip-shaped punching metal 10
0 is wound in a roll shape by the winding roller 5.

In the above embodiment, a case was described in which the coating film 3 was formed twice from the primer layer 3A and the top coating layer 3B on both the front and back surfaces of the strip-shaped punching metal 1. It is also possible to apply the above-mentioned resin paint containing an antifoaming agent only once only on the front side of the band-shaped punching metal 1 or on both the front and back surfaces, and the thickness (dry thickness) at this time is also as follows. It is sufficient to set the thickness in the range of 5 to 25 μm as in the case of the double coating.

Further, as the roll coating method, a method using a natural coat has been described in the above embodiment, but a reverse coat may be used. That is, the coating on the front side is a reverse coat, and the peripheral speed of the applicator rolls 12A, 21A is set to a line speed of 1.2 to 1.2.
By setting the peripheral speed of the applicator rolls 12B and 21B to 1.3 times or more and the coating on the back side as a natural coat, and setting the peripheral speed of the applicator rolls 12B and 21B to a line speed or more, as shown in FIGS. Without leaving the entire inner circumference,
It is possible to paint.

Next, an experimental example by the present inventors will be described. A hole 2 having a diameter d of 1.5 mm has a pitch P of 2 mm,
A punching metal made of a galvanized steel sheet having a diameter of 0.6 mm and having a large opening ratio of 50.9% was used. The punching metal was chromate-treated (pre-treated), and 25% of strontium chromate as a rust preventive pigment was blended. The epoxy resin primer paint is applied to the front and back surfaces of the punched metal by natural roll coating to a thickness (dry thickness) of 5 to 7 μm, respectively, and baked and dried at a temperature of 210 ° C. Is coated with a top coat containing 3% by weight of an antifoaming agent with respect to 100 parts by weight of the total resin paint of a polyester type in a natural roll coating to a thickness (dry thickness) of 14 to 16 μm. It was baked and dried under temperature conditions to obtain a painted punched metal. The line speed at this time was 30 m / min.
Set to.

In the case of the coated punched metal obtained as described above, no film beam was generated. On the other hand, the same punching metal as above was coated with a topcoating paint containing 0.8% by weight of an antifoaming agent. The coating punched metal obtained by baking and drying treatment (Comparative Example 1) shows about 10% of the film beam, and the same top-coating paint as above with 0.6% by weight of an antifoaming agent. Was coated and baked and dried to obtain a coating punching metal (Comparative Example 2) in which about 20% of the film was exposed.

Further, six test pieces of 150 mm length and 70 mm width were taken from the above-mentioned painted punched metal, and a cross cut of 100 mm length was cut into each of the test pieces. As a result of a moisture resistance test in which the film was left for a while, no abnormality was found in the coating film on both the front and back surfaces and the inner peripheral surface of the hole 2.
By the way, the standard of moisture resistance of perforated metal used as interior material for housing related equipment such as microwave oven, fan heater, oven toaster etc. is generally around 170 hours, and the perforated metal according to the present invention fully satisfies the standard. I knew I could do it.

Further, for the above test piece,
As a result of a workability test prescribed in JIS G3312, no peeling of the coating film was visually observed at all even after bending by 0T. Therefore, it was found that there was no rust prevention effect and no deterioration in appearance due to peeling of the coating film during post-processing.

[0042]

As described above, claims 1 and 2 are as described above.
According to the invention of the present invention, since the coating is a continuous punch coated on the belt-shaped punching metal as a coating object, the punching metal processed to a predetermined size and shape is hung on a transport device for each single product, This eliminates the need for troublesome work such as removal from the transfer device, and enables extremely low coating speed, thereby reducing coating costs and, consequently, the cost of coating punched metal. In addition, the use of an elastic roll for coating and the use of a paint in which 1 to 10% by weight of an antifoaming agent is blended with respect to 100 parts by weight of the total resin paint make it possible to damage at least the surface paint layer. It is a punching metal having a large number of small holes equivalent to a diameter of 0.5 to 3 mm, since the paint having increased fluidity can be easily spilled from the surface side to the inner peripheral surface side of the holes without being poured. Without producing membrane beam
It is possible to form a predetermined coating film on the surface and on the inner peripheral surface of a large number of holes, respectively, and it is possible to obtain a coated punching metal having extremely excellent quality and inherent performance.

In particular, when the primer is continuously roll-coated on the surface of the strip-shaped punching metal via the elastic roll before the coating of the paint containing the antifoaming agent, the film peels. Not to mention, it is possible to improve the corrosion resistance, and to obtain a coated punched metal with further improved performance and quality of the product.

According to the third and fourth aspects of the present invention, a band-shaped punching metal is subjected to a pretreatment for coating, and the surface thereof is coated on 100 parts by weight of the entire resin coating. A paint containing 1 to 10% by weight of an antifoaming agent is pressed and baked and dried through an applicator roll made of an elastic roll, so that it is troublesome work as in the case of the conventional coating method. While eliminating the hassle,
In addition to making the coating speed extremely high by continuous coating, it is possible to reduce the cost associated with improving the cost of coating and, consequently, the productivity of coated punched metal products.
A part of the paint applied by pressing against the surface is allowed to enter the inner peripheral surface side of the hole from the surface side, and the paint having increased fluidity is easily wrapped around the inner peripheral surface of the hole.
Even with a punching metal having a large number of small holes equivalent to 3 mm in diameter, a predetermined coating film is formed on the surface and the inner peripheral surface of the large number of holes without causing a film beam. An excellent and high quality painted punched metal can be obtained with high productivity.

In particular, after the pretreatment for coating and before the coating of the paint containing the antifoaming agent, the surface of the band-shaped punching metal is applied via an applicator roll made of an elastic roll. When the primer is pressed and baked and dried, the primer can be efficiently applied to the surface of the band-shaped punching metal and the inner peripheral surface of a large number of holes, and a film beam may be formed on the primer layer. Rust prevention and rust prevention
It is possible to produce inexpensively a painted punched metal product which is not only excellent in corrosion resistance but also excellent in the original function of the punched metal.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view of a main part of the above-mentioned painted strip-shaped punching metal.

FIG. 3 is a schematic configuration diagram of the entire coating equipment for realizing 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 an inner peripheral surface of a hole in a state where a primer paint is naturally coated on a surface of a punching metal during a coating operation.

FIG. 5 is an enlarged cross-sectional view of a main part showing a coating state of an inner peripheral surface of a hole in a state where a primer paint is naturally applied to a back surface of a punching metal in a painting operation.

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

FIG. 7 is an enlarged cross-sectional view of a main part showing a coating state of an inner peripheral surface of a hole in a state where a resin coating material for overcoating is naturally applied to a back surface of a punching metal in a coating operation.

FIG. 8 is an enlarged cross-sectional view of a main part showing a coating state of an inner peripheral surface of a hole in a state where a resin coating material for top coating is reverse-coated on a surface of a punched metal in another embodiment of a coating method.

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

FIG. 10 is an enlarged cross-sectional view of a main part showing a state where the coating is performed by a conventional continuous roll coating unit.

[Explanation of symbols]

1, 1a belt-shaped punching metal 2 hole 3 coating 3A primer layer 3B overcoating layer 8 pretreatment section 9 primer coating apparatus 12A, 12B, 21A, 21B elastic roll (applicator roll) 13A, 22A backing roll 15, 24 baking Drying furnace P1 Primer paint P2 Top coat paint

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-265219 (JP, A) JP-A-48-102135 (JP, A) JP-A-57-156070 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) B05D 1/00-7/26

Claims (4)

(57) [Claims] 1. An antifoaming agent of 1 to 10% by weight based on 100 parts by weight of a total resin coating, at least on a surface of a band-shaped punching metal having a large number of holes having a diameter of 0.5 to 3 mm penetrated on both sides. A coated strip-shaped punching metal, wherein a coating film is formed on at least the surface of the punching metal and the inner peripheral surface of the large number of holes by applying a coating material containing the same through a continuous roll through an elastic roll. 2. A continuous roll coating of a primer via an elastic roll on at least the surface of a strip-shaped punching metal having a large number of holes corresponding to a diameter of 0.5 to 3 mm penetrating through the front and back, By continuously applying a paint prepared by mixing 1 to 10% by weight of an antifoaming agent with respect to 100 parts by weight of the resin paint through an elastic roll, at least the surface of the punching metal and the inner periphery of the large number of holes. Painted strip-shaped punching metal with a coating on each side. 3. A step of applying a pre-coating treatment to a band-shaped punching metal having a large number of holes having a diameter of 0.5 to 3 mm penetrating through the front and back, and applying at least a surface of the resin coating 100 to at least the surface of the band-shaped punching metal. 1 to 10 parts by weight
Press-coating a paint containing an antifoaming agent by weight through an applicator roll composed of an elastic roll, and baking and drying the coated paint. 4. A step of applying a pretreatment for coating to a band-shaped punching metal having a large number of holes having a diameter of 0.5 to 3 mm penetrating through the front and back sides, and applying a primer to at least a surface of the band-shaped punching metal with an elastic roll. Press-coating through an applicator roll consisting of: baking and drying; and then, on the surface of the punched metal, 1 to 10% by weight of an antifoaming agent based on 100 parts by weight of the total resin paint. Roll coating of a band-shaped punching metal, which comprises the steps of: applying a coating material through an applicator roll made of an elastic roll to apply pressure and baking and drying.