JPS5837874B2 - Paint film streak pattern formation method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a coating film that is coated with a viscous resin coating on the roll surface of an ablator roll or a pickup roll (hereinafter collectively referred to as coater roll, etc.) of a reverse type continuous roll coater equipment. Press the doctor onto a part of the
This doctor is controlled parallel to the roll surface and in the vertical direction to form a predetermined continuous or intermittent curved or straight line pattern on the coating film on the roll surface, and then this coating film is A strip of galvanized steel plate, cold-rolled steel, stainless steel, aluminum plate, copper plate, etc. (hereinafter collectively referred to as steel strip) is coated, and then this coating is hardened by a process such as dry baking to create a pattern. This invention relates to a method of forming a streak pattern on a coating film to be fixed.

By the way, viscosity here means that the paint film is in a flexible state that can be moved to the female part by pressing a doctor against the paint film, and that the moved paint film remains as it is for the duration of the painting hardening step 1.
This refers to something that can maintain the same condition.

Also, the term "reverse coating" as used herein refers to a coating method in which the applicator roll is rotated in the opposite direction to the advancing direction of the copper strip.

Conventionally, methods for forming patterns on the surface of a painted object include direct printing using a letterpress roll engraved with overlapping coatings using a gravure printing spray, or the method described in Japanese Patent Publication No. 47-357.
Various methods are known, such as the method of irregularly repeating pattern found in inventions such as No. 22 and Japanese Patent Publication No. 47-32694.

In particular, patterns produced by gravure printing are used for a wide variety of purposes, and beautiful patterns can be obtained.

However, the intaglio rolls used for gravure printing are generally created by photo etching, etc., and the plate-making costs are very high.The amount of ink applied changes due to wear of the intaglio rolls, and the condition of the pattern changes depending on the frequency of use. There is a certain limit to the lifespan of a roll because it changes.

Further, the transferred ink generally has a thin gravure printed surface with a mostly flat appearance.

Patterns are also often formed by overcoating with spray paint, but this requires auxiliary equipment to prevent contamination due to paint scattering, there is a lot of paint loss, and the management of paint spray nozzles is delicate, making it difficult to perform continuous production. It has drawbacks such as poor reproducibility.

In addition, for direct printing with engraved letterpress rolls,
Although complex patterns can be obtained, roll production costs are high, and if there are scratches, it is difficult to reproduce the pattern, it is difficult to obtain a three-dimensional pattern, and the cost of recycling the plate is high. There is a problem.

In addition, Special Public Interest Publication No. 47-35772 and Special Public Interest Publication No. 4.7-3
2694 A pattern form in which a pattern roll with strong elasticity is rotated at a rotation speed different from the moving speed of the substrate while the coating film on the surface of the substrate is wet, and the pattern is imprinted on the coating and then dried. There is a law.

This method is for forming a wood grain pattern, and the surface of the substrate is coated with a wet film in advance, a pattern is formed on it, and then it is dried.

However, the problem with this method is that it requires a very expensive pattern roll, similar to the letterpress roll described above.

Furthermore, this method focuses on obtaining irregular patterns by changing the moving speed of the base material and the rotational speed of the roll, but since the pattern engraved on the roll itself is constant, even if it changes in the longitudinal direction. A complete pattern cycle is shortened and the overall tone remains unchanged.

Recently, repeating patterns using rolls have become popular, and in order to lengthen one complete pattern cycle, it is necessary to increase the diameter of the pattern roll, which significantly increases not only the cost of the roll but also the cost of the entire printing equipment.

In addition, because the speeds of the base material and the rolls are different, the rolls are prone to scratches, and even if a small portion of the rolls is scratched, the entire roll must be replaced, resulting in many economical problems.

The present invention relates to a completely new pattern-forming method that solves the problems of these known methods.

That is, the principle of the present invention is to apply a viscous coating film to the surface of a coater roll of a continuous roll coater equipment consisting of a plurality of reverse-type rolls, and then peel it off using a doctor that is movable relative to the roll surface. This viscous coating film is directly pressed, and the coating film is pushed to both ends of the doctor to form a predetermined streak pattern.Then, the crease pattern coating film is transferred onto the copper band, and the pattern does not disappear after that. The pattern is fixed by curing the paint film.

That is, the feature of the present invention is that continuous or discontinuous straight lines and curves of any size can be three-dimensionally formed on the surface of a reverse-rotating coater roll without using expensive intaglio rolls or letterpress engraving rolls. Various pattern shapes and methods of
It is possible to obtain different types of beautiful patterns, and unlike spray painting, it does not contaminate the surrounding area.

Furthermore, since multiple doctors can be attached in the longitudinal direction, complex patterns can be easily obtained, and individual doctors can be easily replaced during work.

Furthermore, by using a combination of doctors made of different materials, it is possible to form a striped pattern with varying shading.

Furthermore, regarding the adhesion properties of pre-coated steel, the present invention makes it possible to not cover the welded parts with a coating film in advance, which eliminates the conventional effort of peeling off the coating on the fermentation welded parts. It is very large.

The pattern or equipment according to the invention consists of a very simple doctor and its control device.

The doctor is made of a rigid or elastic body that comes into contact with the viscous coating film and pushes it away from both sides, and the thickness and spacing of each doctor can be changed depending on the pattern.

Further, the control device has a function of controlling the movement of the doctor in the parallel and vertical directions with respect to the roll surface.

The pattern adjustment in the present invention is carried out by the relative movement of the doctor with respect to the roll surface by a control device.

That is, as for the shape or method of forming a continuous pattern of the coating film according to the present invention, when obtaining a linear streak pattern by fixing the doctor pressed against the coater roll, etc., the doctor is moved in a direction perpendicular to the roll rotation direction to form a curved pattern. In some cases, these two methods may be combined.

Furthermore, if it is desired to obtain intermittent streaks, this can be easily achieved by changing the time during which the doctor is pressed against the roll surface.

The coating film targeted by the present invention can be made of various commonly used paints, such as polyester paints, acrylic paints, etc., and either thermosetting or thermoplastic paints can be used.

Also, depending on the application, it may be desirable for the paint to contain anti-corrosion pigments to increase corrosion resistance and weather resistance.

Next, the present invention will be specifically explained with reference to the drawings.

FIG. 1 is an overall schematic diagram showing an embodiment of the pattern forming method of the present invention, in which a copper strip A is supplied from a supply device 1 to a pattern forming equipment 2, and a predetermined pattern is transferred and painted on the surface of the steel strip A. do.

Immediately after the pattern is formed on the surface of the steel strip A, the steel strip A is moved to a hardening facility 3 to harden the coating film on the surface and fix the pattern.

The steel strip A is then wound up by the receiving device 4.

FIG. 2 is a front view showing an example of the pattern-shaped equipment of the present invention.

The doctor 31 is made of a material such as metal, plastic, or rubber, and forms a pattern by directly pressing against the viscous coating film on the surface of a coater roll or the like.

The thickness of the doctor 31 determines the thickness of the streaks.

The holder 32 has the function of fixing the doctor blades 31 at predetermined intervals, adjusting the pitch of the streak pattern, and adjusting the pressure contact angle of the doctor blades.

The pressing device 33 is composed of a pressing cylinder or a pressing pressure adjusting bolt, and has a function of adjusting the pressing pressure of the doctor against the roll surface to determine the sharpness, width, etc. of the pattern.

Furthermore, the pressure welding device 33 also has an i function so that the doctor can move up and down with respect to the roll surface.

The parallel moving device 34 is a device that moves the doctor and pressure welding device 33 parallel to the roll surface, and has a function of reciprocating movement using a cylinder, a cam mechanism, etc.

FIGS. 3A, B, C, and D are concrete explanatory diagrams of the pattern correlation method of the present invention.

FIG. 3A shows an example in which the doctor 31 is pressed against the ablifier roll 36 of a two-roll type roll coater equipment.

The rotation direction of the roll is that the applicator roll 36 is a steel strip A.
Reverse rotation with respect to the direction of travel, pick-up roll 3
7 is a natural (same direction) rotation with respect to the applicator roll 36.

In this case, the paint in the paint pan 40 is picked up by the pick-up roll 37, and the film thickness is adjusted between the pick-up roll 37 and the ablator roll 36.

After adjustment, a pattern is formed on this coating film using a doctor 31 and transfer coating is applied to the steel strip A.

If the applicator roll 36 rotates naturally with respect to the copper strip A, the pattern formed by the doctor 31 will rotate naturally with the pick-up roll 37 (with the applicator roll).

), the applicator roll 36 performs painting by rotating in reverse.

This method is suitable when relatively low viscosity paints are used and for creating straight pattern shapes, and the formed pattern has a high definition.

FIG. 3B shows an example in which the doctor 31 is pressed against the ablator roll 36 of a three-roll type roll coater equipment.

In this case, the rotation direction of the roll is the ablator roll 3.
6, the pickup roll 37 rotates in reverse relative to the traveling direction of the copper band A, the pick-up roll 37 rotates in reverse relative to the applicator roll 36, and the metallic roll 38 rotates naturally relative to the pickup roll 37.

This method is suitable when using high viscosity paints.

FIG. 3C shows an example in which the doctor 31 is pressed against the pick-up roll 37 of roll coater equipment.

The rotation direction of the roll is that the applicator roll 36 is a steel strip A.
Reverse rotation with respect to the direction of travel, pick-up roll 3
7 rotates in reverse relative to the ablator roll 36, and the metering roll 38 rotates naturally relative to the big up roll 37.

In this case, the paint in the paint pan 40 is picked up by the pick-up roll 37, and the paint in the paint pan 40 is picked up by the metaling roll 38.
The film thickness is adjusted by

A pattern is formed on the coated film after adjustment by a doctor 31, and the pattern is transferred onto the steel strip A via an applicator roll 36.

The advantages of the pattern on the surface of the pickup roll are:
This roll is usually a steel roll and has a high surface hardness, making it suitable for the swinging properties of the doctor, making it ideal for forming curved patterns.

FIG. 3D shows an example in which the doctor 31 is pressed against the ablator roll 36 and the pick-up roll 37.

The rotation direction of the roll is that the applicator roll 36 is a steel strip A.
The pick-up roll 37 rotates in reverse relative to the abplicator roll 36, and the metering roll 38 rotates naturally relative to the pick-up roll 37.

In this case, the paint in the paint pan 40 is picked up by the pickup roll 37, and the film thickness is adjusted by the metering roll 38.

After adjustment, a pattern is formed on the coated film using the doctor 31 on the pick-up roll 37, and then the applicator roll 3
6, the pattern is formed again with the doctor 31 of the song.

Thereafter, the coating film with these patterns is transferred onto the steel strip A.

This method is suitable for obtaining complex patterns, and a complex and beautiful pattern can be obtained by varying the vertical and horizontal movements of the doctor 31 and the appropriate use of doctor hardness.

In the present invention, a stable and beautiful pattern can be obtained by appropriately adjusting conditions such as the material, hardness, shape, pressure contact force, pressure contact angle with the surface of the coater roll, moving speed, etc. of the doctor.

All of these conditions are quantitative, and it is advantageous that the reproducibility of the pattern can be understood numerically.

The material of the doctor used in the present invention is steel, metal such as aluminum, polystyrene, polyethylene, urea, A. B
．． S. , polypropylene, nylon, plastic such as PVC, or S. B. R. Rubber-based materials such as butyl, nitrile, silicone, urethane, and chloroprene are recommended; however, they must not cause scratches on the surface of the coater roll, etc., be abrasion resistant, and have the strength to withstand pressure. It is important to select a material that takes into account that it will not be deteriorated by a viscous coating film.

In general, a highly elastic doctor is suitable for rolls with relatively high surface hardness (for example, Shore hardness of 50 or more), and a highly rigid doctor is suitable for rolls with low surface hardness.

Doctors made of hard materials such as spring steel are suitable when the roll surface is in pressure contact with applicator rolls coated with rubber such as urethane, nitrile, or neofrene, while doctors made of soft materials such as plastic or rubber are suitable for applications made of hard chrome. Ideal for pressure contact with pick-up rolls that have hard surfaces that are plated or chilled.

The pressure force of the doctor should vary depending on the sharpness of the pattern, the thickness of the doctor, the pressure angle, the degree of viscosity, the hardness of the surface of the coater roll, etc., but from 30g/cm per unit length of the doctor. A range of 500 g/α is common.

If the pressing force is less than 30 g/CIrL, the streak pattern becomes unclear.

If the contact force exceeds 500.9/cm, problems such as abrasion of the doctor, deformation of the tip shape, and scratches on the surface of the coater roll etc. will occur.

Regarding the pressure contact angle, as shown in Figure 4, if the angle represented by B in the figure is used in a large range, the paint film will be completely pressed, and after transfer painting to the steel strip, a good pattern will be created due to the color difference of the base. Provides clarity.

As the pressure contact angle decreases, a small amount of the paint film will remain on the pattern-like areas of the lines, and after transfer coating to the steel strip, the color tone will be intermediate between the base color of the steel strip surface and the tint of the paint film.

The rotational speed of the roll is adjusted to obtain an appropriate film thickness depending on the type of paint used, film thickness, viscosity, etc.

The moving speed of the copper strip is determined in consideration of the chicken tropic properties of the viscous coating film, productivity, etc.

In the case of a coating film with low thixotropic properties, it should be applied as soon as possible after the pattern is formed and cured using curing equipment.Also, from the point of view of improving productivity, it is desirable that the moving speed be as fast as possible, but roll coating The maximum rate is limited depending on the physical limitations of the case and the capacity of the curing equipment, and is generally 15 per minute.
It is about 0m.

Curing equipment includes hot air type, ultraviolet ray type, and electron beam type, but these should be determined depending on the type and properties of the paint used.

Next, examples of the present invention will be described.

Example 1 Base material Galvanized iron plate coil viscous coating coated with polyester paint Resin system Polyester prefectural paint Film thickness Approximately 40 micron viscosity when undried Doctor condition Pressure welding location Material Hardness Arrangement Pressure contact angle Pressure contact force Movement Throughput Temporary speed Curing conditions Equipment Baking time Baking temperature Obtained pattern Example 2 Figure 3 A roll surface is made of nitrile rubber H. 8.50° Spring steel SUP-6 HB 3 6 0 ~ 430 Multiple rows perpendicular to the rotation direction of the ablator roll 25° 400 g/CTL Constant in the width direction of the ablator roll, constant in the vertical direction 90 m/min Hot air circulation drying oven 30 seconds at 300'C Cold-rolled complex coil with base material PVC paint cured as shown in Figure 5A? Resin type PVC sol paint Film thickness Approximately 100 microns viscosity when undried 7000 CPS Doctor condition pressure welding location Figure 3 C Roll surface is hard chrome plating H
．． 8.70' Material Urethane rubber Hardness H. S. 55° arrangement Multiple rows perpendicular to the rotational direction of the pick-up roll Press contact angle 60° Pressure force 100 g/C1rL Movement Swinging perpendicular to the pick-up roll rotation direction Threading speed 30 m/min Curing conditions Equipment Hot air circulation drying Furnace baking time: 90 seconds Baking temperature: 2500C Resulting pattern Example 3 shown in Figure 5B Base material: Galvanized iron plate coil viscous coating resin based on polyester paint applied and cured Polyester paint Film thickness: approx. 40 mm when not dried Chron viscosity: Approximately 30 seconds with #4 feed cup under doctor conditions Pressure welding location Fig. 3 B Roll surface is made of urethane rubber H. S.
50゜Material Vinyl chloride resin Hardness H. 8.50° Arrangement Two rows perpendicular to the rotational direction of the ablator roll Pressing angle 90 Pressing force 60g/crrL Movement The first and second rows are alternately moved up and down against the roll surface at 30m/min. Speed curing conditions Equipment Ultraviolet curing drying oven Baking time 5 seconds Baking temperature 120W x 6 patterns Obtained Example shown in Figure 5C 4 Base material Galvanized iron plate coil viscous coating resin system coated with polyester paint and cured Heat Cured acrylic paint Changed film thickness Approximately 30 microns viscosity when not dried Approximately 80 seconds with a #4 feed cup Doctor condition pressure welding location Figure 3 D Temporary speed 40 m/min Curing conditions Equipment Baking time Baking temperature Examples of patterns obtained 5 Substrate Cold-rolled steel coil treated with zinc phosphate compound Hot air circulation drying oven 60 seconds 3000 C Viscous coating resin system shown in Figure 5 D Thermosetting acrylic paint Film thickness Approximately 15% when undried Micron viscosity: Approximately 80 seconds with a #4 feed cup under doctor conditions Pressure location Figure 3 A Roll surface is made of urethane rubber H. 8.
50" Material Vinyl chloride resin Hardness H. 8.75° Arrangement One on each side of the applicator roll, placed at an angle of 45° with respect to the direction of travel Pressure angle 30° Pressure force 500 El/cm Movement Aburi Curing conditions Equipment: Hot air circulation drying oven Baking conditions: 45 seconds Baking temperature: 3,000C This is the part where the coating film on the surface of the roll etc. is pushed apart and becomes unpainted and the surface of the steel strip base is visible after transfer painting, and 6 is the part where the pox film on the surface of the coater roll etc. is gathered between the doctor and the doctor. This is the part that was then transfer-painted onto the steel strip.

Here, the transferred paint film is pushed apart by a doctor on the surface of the coater roll, etc., and a pattern is created by contrasting with the steel strip base surface that appears unpainted after the transfer painting, and further on the surface of the coater roll, etc. After transfer painting, the parts where the paint film has been pushed apart and the parts where it has been gathered together create a difference in the thickness of the paint film on the surface of the copper strip, giving it a three-dimensional effect.

A variety of vivid patterns can be obtained with these particularly simple installations.

Furthermore, more complex patterns can be obtained by combining these or by changing the number and arrangement of the doctors, the method of swinging the doctors, etc.

Further, the effects of the present invention include, for example, a design effect, a liao-contact effect, etc.As for the design effect, unlike the one complete pattern cycle obtained by roll printing, it is possible to obtain a longer and more complex pattern, and the color, By combining it with a three-dimensional effect, a richly decorative item can be obtained.

Further, as a welding effect, it is possible to leave the welding portion unpainted in advance in order to perform seam welding, spot welding, etc.

Therefore, the effects are very large, such as eliminating the need for the time and effort required to peel off the coating film on the welded parts as in the past, resulting in a good finish.

The use of the striped steel sheet obtained by the present invention is as follows:
For design purposes, it is used for building interiors such as siding, roofing, partitions, doors, floors, and ceiling panels.

In addition, general items such as furniture, Peruvian cans,
It is widely used for items that require physical contact during production, such as home appliances and various storage boxes.

As described above, the present invention is a new method for creating a streaky pattern of a coating film that is very simple and allows a beautiful pattern with reliable reproducibility to be obtained.

[Brief explanation of the drawing]

FIG. 1 is an overall schematic diagram showing an embodiment of the present invention, FIG. 2 is a front view of a pattern forming device, and FIGS. 3 A, B, C, and D are explanatory diagrams showing a pattern forming method of the present invention. Figure 4 is a diagram showing the pressure contact angle between the coater roll etc. and the doctor, Figure 5 A, B, C,
D and E are diagrams showing an example of a striped pattern formed according to the present invention. DESCRIPTION OF SYMBOLS 1... Feeding device, 2... Pattern-forming equipment, 3... Curing equipment, 4... Receiving device, 5... Pressed part, 6... Gathered part, A ...Steel strip, B
... Pressure angle between coater roll etc. and doctor, 31
... Doctor, 32 ... Holder, 33 ... Pressure contact device, 34 ... Parallel movement device, 35 ... Coater roll etc., 36 ... Applicator roll, 37 ... Pickup roll, 38 ...Metaling roll, 39
...Backup roll, 40...Paint pan.

Claims (1)

[Claims] 1. In reverse type continuous roll coating, a plurality of rigid or elastic bodies movable relative to the roll are attached to a part of the viscous resin coating film attached to the surface of the applicator roll of roll coater equipment. A patterning doctor is pressed against the roll surface, and the relative movement of this doctor to the roll surface is controlled to form a striped pattern on the surface of the viscous coating film, and then the striped pattern is transferred and painted onto the copper strip. This method is characterized by the fact that the coating film is coated with a striped pattern and then cured. 2. In reverse type continuous roll coating, multiple patterning doctors made of rigid or elastic bodies that are movable relative to the roll are pressed onto a part of the viscous resin coating film attached to the surface of the pick-up roll of the roll coater equipment. Then, by controlling the relative movement of this doctor to the roll surface,
A method for forming a striped pattern on a coating film, which is characterized in that a striped pattern is formed on the surface of a viscous coating film, and then the striped pattern is transferred onto a copper strip and then cured. 3. During reverse continuous roll coating, a plurality of rigid or elastic bodies movable relative to the roll are attached to a part of the viscous resin coating film attached to the applicator roll surface and the pickup roll surface of the roll coater equipment. A number of patterning doctors are pressed together, and the movement of the doctor relative to the roll surface is controlled to create a streaky pattern on the surface of the viscous coating film.Then, the streaky pattern is then transferred and painted onto the copper strip. A method for creating a crease pattern of a coating film, which is characterized in that it is applied and then cured.