JPS6134871B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention applies coating to the surface of a galvanized steel plate, cold-rolled steel plate, stainless steel plate, aluminum plate, copper plate, etc. (hereinafter collectively referred to as steel strip) by a method such as roll coating or spray coating. Then, a plurality of patterning doctors (including a squeegee, etc.) are pressed against the applied viscous coating film, and the doctors are moved horizontally with respect to the steel strip's advancing direction and perpendicularly to the steel strip surface. The movement of the steel strip is controlled in the direction of movement, the advancing speed of the steel strip, and the movement in the width direction to form a predetermined continuous or intermittent curve or direct streak pattern on the coating film, and then this coating film is subjected to dry baking or other methods. The present invention relates to a continuous manufacturing method for a streak pattern coated steel strip, which hardens through treatment to fix the pattern, and then winds up the steel strip.

In addition, the viscosity referred to here means that the paint film is in a flexible state that can be moved to other parts by pressing a doctor against the paint film, and that it can remain in that state until it is cured. say something.

Conventionally, methods for forming patterns on the surface of painted objects include overcoating with gravure printing spray, direct printing with an engraved letterpress roll, or the inventions discovered in Japanese Patent Publications No. 47-35772 and No. 47-32694. Various methods are known, such as methods for forming irregularly repeating patterns. In particular, patterns produced by gravure printing are used for a variety of purposes, and beautiful patterns can be obtained.

However, the intaglio rolls used in gravure printing are generally created by photo etching, etc., and platemaking costs are very high.The amount of ink applied changes due to wear of the intaglio rolls, and the condition of the pattern depends on the frequency of use. There is a certain limit to the lifespan of a roll because it changes over time. Further, the transferred ink generally has a thin gravure printed surface with a mostly flat appearance. In addition, patterns are 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 the paint spray nozzle is delicate, and this is difficult to do in continuous production. has drawbacks such as poor reproducibility.

Furthermore, in the case of direct printing using an engraved letterpress roll, complex patterns can be obtained, but the roll production costs are high, and if there are scratches, it is difficult to reproduce the pattern, and the three-dimensional pattern There are problems such as it is difficult to obtain and the cost of reproducing the version is high.

In addition, special public service No. 47-35772 and special public service No. 47-32694
There is a pattern forming method in which an elastic pattern roll 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, forming a pattern on the coating, and then drying. . Although this method is for forming a wood grain pattern, it appears to be somewhat similar to the present invention in that a wet film is pre-coated on the surface of a substrate, 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.
Since the pattern engraved on the roll itself is constant, even if it changes in the longitudinal direction, one complete pattern cycle will be shortened and the overall tone will not change. Nowadays, repeating patterns using rolls are becoming more 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. Also, because the speed of the base material and the roll are different, the roll is prone to scratches.
There are many economical problems, such as having to replace the entire roll even if a small portion becomes defective.

The present invention relates to a continuous production method for streak pattern coated steel strip using a completely new pattern forming method that solves the problems of these known methods.

That is, the principle of the present invention is to coat the surface of the steel strip with a coating film that has viscosity in advance, and then directly press a plurality of doctors, whose relative movement with the steel strip is controlled, to this viscous coating film, and apply the coating film to both ends of the doctor. A predetermined streak pattern is formed on the coating film by pushing it away, and then the coating film is hardened to fix the pattern so that the pattern does not disappear, and then the steel strip is wound up.

That is, the feature of the present invention is that continuous or discontinuous direct and curved lines of arbitrary thickness can be formed three-dimensionally on the surface of a steel strip without using expensive intaglio rolls or letterpress engraving rolls, and can be applied to the various pattern forming methods described above. It is possible to obtain a completely different type of beautiful pattern, 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 shading. Furthermore, regarding the weldability of pre-coated steel sheets, the present invention makes it possible to not cover the welded area with a coating film in advance, which saves the conventional effort of peeling off the coating film on the welded area, which is a huge advantage. be.

The pattern forming 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 to both sides, and the thickness of each doctor and the spacing between them can be changed depending on the pattern. Further, the control device holds the doctor, adjusts the pressure contact force, and has the function of controlling the movement of the doctor in the lateral direction with respect to the steel strip traveling direction and the movement in the vertical direction with respect to the steel strip surface.

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

In other words, when adjusting the continuous pattern of the coating film according to the present invention, the movement of the doctor in the lateral direction with respect to the steel strip traveling direction is limited to two cases: one in which the steel strip is fixed and the doctor is moved, one in which the steel strip is fixed and the doctor is moved, and one in which the doctor is moved while the steel strip is fixed. There are three ways to move both the doctor and the doctor. In addition, in order to obtain an intermittent line, the welding time can be varied by moving the doctor up and down on the surface of the steel strip. The method of fixing the doctor and moving the steel strip is suitable for producing continuous striped patterns, while the method of moving both the steel strip and doctor is suitable for continuous production and when the pattern changes in a complex manner. A suitable and complex curved line pattern can be obtained. Furthermore, the method of fixing the steel strip and moving the doctor is inferior to the previous two methods in terms of productivity, but is suitable for obtaining complex and delicate patterns. In addition to the above three methods, an interrupted line pattern can also be obtained by vertical movement of the doctor.

For the coating film targeted by the present invention, industrial paints such as polyester paints, acrylic paints, etc. can be used, and either thermosetting or thermoplastic paints can be used. In addition, for applications, it is desirable that the paint contains anti-corrosion pigments to increase corrosion resistance.

Next, the present invention will be specifically explained with reference to the drawings.
FIG. 1 is an overall schematic view showing an embodiment of the method for continuous production of streak pattern coated steel strip of the present invention. Steel strip A is supplied from a supply device 1 to a continuous coating equipment 2, A viscous film is applied to the surface. Furthermore, the steel strip A is moved to the pattern forming equipment 3 while still having the viscosity of the coating film, and a predetermined streak pattern is formed on its surface. Immediately after the pattern is formed on the surface of the viscous coating, the steel strip A is transferred to the hardening equipment 4.
The surface coating is cured and the pattern is fixed. The steel strip A is then wound up by a receiving device 5. FIGS. 2 and 3 are a front view and a side view showing an example of pattern forming equipment according to an embodiment of the present invention. The doctor 31 is made of a material such as metal, plastic, or rubber, and is pressed directly against the steel strip A to form a pattern. 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 pressure welding device 33 consists of a pressing cylinder or a pressing pressure adjustment bolt, etc., and adjusts the pressing pressure of the doctor against the steel strip surface to improve the clarity of the pattern.
It has the function of determining the width etc. Furthermore, pressure welding device 3
3 also has a function that allows the doctor to move up and down with respect to the steel strip surface. Parallel displacement device 34
is a device that moves the doctor and pressure welding device 33 parallel to the surface of the steel strip, and has a function of performing circular or reciprocating motion using a cylinder, cam mechanism, etc. The back up roll 35 is a roll for keeping the position of the steel strip A constant regardless of tension fluctuations.

In the present invention, a stable and beautiful pattern can be obtained by appropriately adjusting conditions such as the material, stiffness, shape, pressing force, pressing angle with the steel strip surface, and moving speed 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,
Metals such as aluminum, polystyrene, polyethylene,
Plastic-based materials such as urea, ABS, polypropylene, nylon, and PVC, or rubber-based materials such as SBR, butyl, nitrile, silicone, urethane, and chloroprene are recommended. It is important to select a material that is abrasive, strong enough to withstand pressure, and that the viscous coating film does not change in quality. In general, a doctor with high elasticity is suitable for steel strips with many irregularities on the surface, and a doctor with high rigidity is suitable for steel strips with a smooth surface. Doctors made of hard materials such as spring steel are suitable for steel strips with soft surfaces coated with rubber or PVC resin, while doctors made of soft materials such as plastic or rubber are suitable for use with galvanized iron plates, cold-rolled steel plates, etc. Ideal for steel strips with similarly hard surfaces. As shown in Fig. 4A and B, there are two types of doctor's pushing surfaces: flat and spherical.
If the doctor is fixed on the flat one,
Spherical objects can achieve a moderate pushing effect when moving. In addition, Figures 5A and 5B are diagrams showing the shape of the tip of the doctor, and there are two types with a flat tip shape and a spherical tip shape, but the flat one requires direct creation of a pattern and a three-dimensional effect in the pattern. The one with a spherical tip is suitable for creating curved patterns. 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 steel strip surface, etc.
The range is generally from g/cm to 500 g/cm. If the pressure welding force is less than 30 g/cm, the streaks will not be clear and the streak pattern will be interrupted due to unevenness on the surface of the steel strip. If the contact force exceeds 500 g/cm, problems such as wear of the doctor blade, deformation of the shape of the tip, and scratches on the surface of the steel strip will occur. As shown in Figure 6, if the welding angle is between 60° and 90° with respect to the steel surface, the steel strip surface will be completely exposed, resulting in good pattern clarity due to the color difference of the base. It will be done. When used in an angle range of 60°C or less, a small amount of the paint film remains on the pattern forming part of the stripes, and the color tone is intermediate between the base color of the steel strip surface and the color of the paint film. The moving speed of the steel strip or the doctor is determined by taking into consideration the thixotropic properties of the viscous coating film, productivity, etc. In the case of a coating film with low thixotropic properties, it should be cured in a curing equipment as soon as possible after pattern formation, and from the viewpoint of improving productivity, it is desirable that the moving speed be as fast as possible. However, there is a limit to the painting equipment, and in general, even roll painting is done at a speed of 150 m/min.
That's about it.

As continuous coating equipment, equipment such as roll coaters, curtain flow coaters, and spray coaters are generally used, but roll coaters are recommended because of their excellent uniformity of film thickness. Curing equipment includes hot air type, ultraviolet ray type, and electron beam type equipment, as well as cooling equipment used in the case of hot melt 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 Steel strip Galvanized iron plate coil viscous coating film conditions with polyester paint cured Painting equipment Roll coater Resin-based polyester paint Film thickness 40 microns Viscosity #4 food cup 100 seconds pattern formation conditions Doctor material Vinyl chloride resin Doctor Hardness HS75゜ Doctor cross-sectional shape Pushing surface flat, width 3mm
Thickness 2mm Doctor tip shape Flat Doctor arrangement Multiple pieces arranged in a line perpendicular to the direction of movement of the steel strip Pattern - number of cycle meters Continuous Pressure angle 75° Doctor pressure force 50g/cm Moving conditions Steel strip Moves linearly at 90m/min Doctor fixed Curing conditions Curing equipment Hot air circulation drying oven Curing time 30 seconds Curing temperature 300°C Resulting pattern Figure 7A Example 2 Steel strip Cold-rolled steel coil viscous coating film conditions coated with PVC paint Curing equipment Curtain flow Coater Resin-based PVC sol-based paint Paint thickness 200 microns Viscosity 7000C.PS Pattern forming conditions Doctor material Urethane rubber Doctor hardness HS55゜ Doctor cross-sectional shape Pressing surface Spherical, diameter 5
mm Doctor tip shape Spherical Doctor arrangement Multiple pieces arranged in a line perpendicular to the direction of movement of the steel strip Pattern - Number of cycle meters 1 m Pressure angle 30° Pressure force of the doctor 100g/cm Moving conditions Steel strip Moves linearly at 30m/min Doctor Steel strip Curing conditions: oscillating horizontally with respect to the direction of movement Curing equipment Hot air circulation drying oven Curing time: 90 seconds Curing temperature: 250°C Obtained pattern Figure 7B Example 3 Steel strip Galvanized iron plate coated with polyester paint and cured Coil viscous coating film conditions Coating equipment Spray coater Resin-based polyurethane paint Film thickness 40 microns Viscosity #4 Foord cup 30 second pattern forming conditions Doctor material Spring steel SUP6 Doctor hardness HB360-430 Doctor cross-sectional shape Push-off surface Plane, width 5
mm Thickness 0.2mm Doctor tip shape Plane Doctor arrangement Multiple pieces arranged in two rows perpendicular to the direction of movement of the steel strip Pattern - Number of cycle meters 5m Pressure angle 15゜ Doctor pressure contact 400g/cm Moving conditions Steel strip directly at 30m/min Moving doctor Alternately move the first and second rows up and down against the steel strip surface Hardening conditions Curing equipment Ultraviolet curing drying oven Curing time 5 seconds Curing temperature 120W x 6 pieces obtained Figure 7C Example 4 Steel Band: Galvanized iron plate coil viscous coating film conditions with polyester paint cured Painting equipment: Roll coater Resin: Thermosetting acrylic paint Film thickness: 30 microns Viscosity #4: Conditions for forming a 80-second pattern with a food cup Doctor material: 1st row: Vinyl chloride resin 2nd and 3rd row urethane rubber Doctor hardness 1st row HS75゜ 2nd and 3rd row HS45゜ Doctor cross-sectional shape 1st row Pushing surface Flat Width 5 mm, tip shape Flat 2nd and 3rd row Pushing surface Spherical , diameter 3mm
Tip shape: Spherical Doctor arrangement: 1st row: Multiple pieces placed in a row perpendicular to the direction of steel strip travel 2nd and 3rd row: Multiple pieces placed in a row at right angles to the traveling direction of the steel strip Pressure angle: 1st row: 75° 2 rows 3rd row 30° doctor pressure contact force 1st row 50g/cm 2nd row 75g/cm Pattern - Number of cycle meters 1.8m Moving conditions Steel strip Straight line movement at 40m/min Doctor 1st row Steel strip 2nd and 3rd rows oscillate vertically at right angles to the advancing direction of the steel strip Hardening conditions Hardening equipment Hot air circulation drying oven Hardening time 60 seconds Hardening temperature 300°C Resulting pattern Figure 7 D Implementation Example 5 Steel strip Conditions for viscous coating on a cold-rolled steel coil coated with zinc phosphate-based chemical conversion coating Coating equipment Roll coater Resin-based thermosetting acrylic paint Film thickness 15 microns Viscosity #4 Conditions for forming 80-second pattern on Ford cup Doctor material Nitrile rubber Doctor hardness HS75゜ Doctor cross-sectional shape Pushing surface Flat, width 50mm
Plate thickness 10mm Doctor tip shape Flat Doctor placement One on each side of the steel strip placed at an angle of 45° to the direction of movement Pattern - Number of cycle meters Continuous Pressure angle 60° Doctor pressure contact force 500g/cm Moving conditions Steel strip 60m/ Moves in a straight line in minutes Doctor As the steel strip swings (walks) at right angles to the direction of movement of the steel strip, it swings by the same amount.

Curing conditions Curing equipment Hot air circulation drying oven Curing time 45 seconds Curing temperature 300℃ Resulting pattern Figure 7 E Example 6 Steel strip Corrosion-resistant aluminum alloy coil (5052) Viscous coating conditions Coating equipment Roll coater Resin type Polyester type Paint Film thickness 30 microns Viscosity #4 Foord cup 100 seconds pattern formation conditions Doctor material Nylon resin Doctor hardness HS70゜ Doctor cross-sectional shape Pressing surface Spherical, diameter 5
mm Doctor tip shape Spherical Doctor arrangement Multiple pieces arranged in a line perpendicular to the direction of movement of the steel strip Pattern - Number of cycle meters 1 m Pressure angle 90° Pressure force of the doctor 30g/cm Moving conditions Steel strip Moves directly at 30m/min Doctor Individual Curing conditions: Squeegee rotates independently Curing equipment: Hot air circulation drying oven Curing time: 60 seconds Curing temperature: 300°C The resulting pattern Figure 7 This is the visible part, and 7 is the part where the paint film gathers between the doctors. The pattern is created by contrasting the applied paint film with the surface of the steel strip that appears after the paint film is pushed apart by a doctor, and the difference in film thickness between the pushed apart part and the gathered part of the paint film creates a pattern. Gives a three-dimensional feel.

As shown, various clear patterns can be obtained using very simple equipment. Furthermore, more complex patterns can be obtained by combining these methods or by changing the number and arrangement of the doctors and the method of swinging the doctors.

In addition, the present invention is configured to apply continuous coating, then form a streak pattern by relative movement between the steel strip and the doctor, then harden the coating film, and then roll it up, so that various streak patterns can be created. It is possible to efficiently and continuously manufacture steel sheets having a coating film of 100% or less, and the workability is also good.

It is very different from manufacturing using patterned rolls in that various patterns can be easily obtained and the patterns can be easily changed (changes can even be made during manufacturing), and are extremely useful.

Furthermore, the effects of the present invention include, for example, a design effect, a welding effect, etc. As for the design effect, unlike the one complete pattern cycle obtained by the roll printing method, it is possible to obtain a longer and more complex pattern, and the color, In combination with a three-dimensional effect, a richly decorative item can be obtained. Further, as a welding effect, it is possible to make the welding part unpainted beforehand in order to perform seam welding, spot welding, etc. Therefore, there is no need to remove the coating film from the welded area as in the past.
The effects are very large, such as saving time and producing a good finish.

The striped steel sheet obtained by the present invention is used for design purposes, as siding materials, roofing materials, and for architectural interiors such as partitions, doors, floors, and ceiling panels. Furthermore, for welding, it is widely used for items that require welding during production, such as general furniture, Peruvian cans, home appliances, and various storage boxes.

As described above, the present invention is a new method for continuously producing a streak-patterned coated steel strip that is very simple, beautiful, and provides a patterned coated steel sheet with reliable reproducibility.

[Brief explanation of the drawing]

FIG. 1 is an overall schematic diagram showing an embodiment of the present invention, FIGS. 2 and 3 are a front view and a side view of a pattern forming device according to an embodiment of the present invention, and FIGS. 4A and 4B are cross-sectional views of a doctor. Figures showing the shape, Figures 5A and B are diagrams showing the shape of the tip of the doctor, Figure 6 is a diagram showing the pressure contact angle between the steel strip and the doctor, Figure 7A, B, C,
D, E, and F are diagrams showing examples of striped patterns formed according to the present invention. 1... Steel strip supply device, 2... Continuous coating equipment, 3
...Pattern forming equipment, 4...Hardening equipment, 5...Receiving device, 6...Pressed part, 7...Gathered part, A...Steel strip, B...Has viscosity Coating film, 31... Doctor, 32... Holder, 33... Pressing device, 34... Parallel displacement device,
35... Backlash Prowl.

Claims (1)

[Claims] 1. A resin paint is applied to the surface of the steel strip using continuous coating equipment to form a coating film, and then, in a state where the coating film has viscosity, the coating film is coated with lateral movement relative to the steel strip traveling direction and A plurality of patterning doctors whose movement in the direction perpendicular to the strip surface is controlled are pressed together, and each patterning doctor can be moved in the lateral direction with respect to the steel strip traveling direction, the movement in the vertical direction with respect to the steel strip surface, and the movement of the steel strip. The streak pattern is characterized by forming a streak pattern on the surface of the viscous coating film by controlling the advancing speed and movement in the width direction, and then hardening the viscous coating film with a curing equipment, and then winding up the steel strip. Continuous manufacturing method for pattern coated steel strip.