JPH0455120B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a decorative coating and an embossing device for forming irregularities in an arbitrary pattern on a thin metal plate having a decorative coating made of film. In general, thin metal sheets, particularly organic coated steel sheets, fluorine resin coated steel sheets, and vinyl chloride steel sheets, are used for a wide variety of purposes. This is because this type of steel sheet has excellent workability and design, and is also durable. Recently, demand has shifted from the above-mentioned flat steel plates to steel plates with enhanced fashionability by adding a three-dimensional effect or two-tone color to the surface. As a steel plate corresponding to this, for example, a steel plate on which an irregular pattern is formed by embossing is commercially available. However, when we conducted a salt spray test (JIS-Z-2371) on these steel plates, we found that the
Rust and peeling of the paint film were observed on the bent parts over time. In addition, when observing the surface of this type of steel sheet under 30x magnification, it can be seen that some of the coating film has peeled off and become wrinkled, scratched, cracked, or thinned at the bent parts of concave and convex parts. or cracks were occurring. This tendency was especially severe when deep embossing was applied in one go. In order to eliminate such defects, the present invention prints arbitrary patterns (shading, uneven patterns) on the decorative surface, softens the steel plate and coating during embossing, and exhibits ductility. The purpose of the present invention is to propose an embossing device that can easily correct residual distortion and form a beautiful, three-dimensional, uneven pattern surface and a highly durable steel plate. DESCRIPTION OF THE PREFERRED EMBODIMENTS The embossing apparatus according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an example of the above-mentioned device, in which 1 is a thin metal plate feeding section (hereinafter simply referred to as the feeding section), which is composed of an uncoiler 2 and a pinch roller 3, and is a flat plate wound into a coil. This is for attaching a shaped metal thin plate A (having a decorative film such as a decorative paint film or a decorative film) and constantly feeding it to the loop portion 4 without strain.
The loop section 4 controls the speed difference and deviation that occur when transferring the thin metal plate A (hereinafter simply referred to as a coil) after the heater section 5 in the next process by loosening the coil A, and also This functions to prevent a large impact from being applied to the coil A being fed. In addition, the heater section 5 consists of a pinch roller 6 that also serves as a guide and a heater 7.
The pinch roller 6 has upper and lower coils A and 6b.
is clamped only at the start of the line, and thereafter serves as a mere guide roller to feed the coil to the heater 7. In addition, the heater 7 heats the decorative coating of the coil A, essentially the coil A itself, to about 30 to 60°C to soften the decorative coating, and prevents the decorative coating from peeling off from the steel plate during embossing, cracking, and scratches. This is to prevent cracks from occurring. The heating method is one of a hot air method, an open flame method, and a hot wire method. 8 is a pinch roller and coil A
is fed to the embossing roll group 9 at a predetermined speed, and also functions as a brake against the movement of the coil A during embossing.
The embossing roll group 9 is the first embossing roll 1
0, a main embossing roll 12, a heater 11, and a tuning mechanism 13, and is used to form arbitrary uneven patterns B and C on the coil A as shown in FIG. 2, for example. To explain further, the primary embossing roll 10 includes upper and lower rolls 10a,
10b forms approximately 20 to 80% of the final concave and convex patterns B and C, and any desired color or pattern is printed on the concave or convex portions. That is, the uneven pattern B shown in FIG. 2 is shown in FIGS. 3a and 3b,
As shown by extracting and enlarging a part of C, the upper and lower rolls 10a and 10b have the pattern shown by the two-dot chain line among the final uneven patterns B and C (shown by the solid line), and b
It is processed to the depth shown in the figure, and a part of it is embossed with chipping print or valley print with arbitrary colors and patterns. This is to enhance the three-dimensional effect, especially to apply any color or pattern to all or part of the top, bottom, and side surfaces of the uneven patterns B and C. The heater 11 is the primary embossing roll 1
This is for drying or baking the ink or paint applied to the pattern formed in step 0.
The main embossing roll 12 consisting of the lower rolls 12a and 12b is used to complete the unfinished uneven pattern processed by the first embossing roll 10 into uneven patterns B and C. In addition, the upper and lower rolls 10
a, 10b, 12a, and 12b are formed to have the same outer diameter and the same pattern. Furthermore, the tuning mechanism 13
The rotation of the primary embossing roll 10 and the main embossing roll 12 are synchronized so that the uneven patterns B and C on the coil A are synchronized. 14
is for correcting residual strain existing in the coil A embossed with a leveler. For example, as shown in FIG. 4, upper rollers 14a ₁ , 14a ₂ , 14a ₃ , . . .
...14an (shown up to 14a ₃ in the diagram), lower roller 1
4b ₁ , 14b ₂ , 14b ₃ , ...14bn (14bn in the figure)
b Arranged in a zigzag pattern in the order of (shown up to ₄ ), and
The gap G between the upper roller group 14a and the lower roller group 14b can be adjusted. Reference numeral 15 denotes a tensioning pinch roller which rotates faster than the embossing roll group 9 and allows the coil A to pass through the processes of the embossing roll group 9 and the leveler 14 while being stretched (under tension). Next, the operation of the embossing device according to the present invention will be explained. First, the coil A attached to the feeding section 1 is fed to the loop section 4 via the pinch roller 3. In addition, at this time, the coil A is connected to the pinch roller 3.
Since the uncoiler 2 is equipped with a braking device (not shown) even when the coil A is pulled by the uncoiler 2, the coil A is fed to the loop section 4 under a certain permissible tension. The coil A is then transferred from the loop section 4 to the heater section 5 by a pinch roller 6 which also serves as a guide.
The cosmetic film is then fed to a heater 7, where it is heated to about 30 to 60°C to soften the decorative film, and then fed to a pinch roller 8. Note that the pinch roller 6 that also serves as a guide functions as a pinch roller until it guides the coil A to the pinch roller 8, and thereafter functions as a mere guide roller. Next, pinch roller 8
The coil A sent out from the embossing roll 9 is fed to the embossing roll 9, and the coil A is given an unfinished pattern as shown in FIG. It adheres only to half of the side surface, which is dried with a heater 11, and then with an embossing roll 12 to create an unfinished uneven pattern.
B' and C' are matched and embossing is performed at the same rotation speed to form uneven patterns B and C as shown in FIG. Note that at this time, the embossing process is performed with tension being applied to the coil A. The coil A sent out from the embossing roll section 9 is corrected by a leveler 14 to remove residual strain during embossing while being stretched by a tensioning pinch roller 15, and sent to the next process (not shown). It is something that is provided. moreover,
When the force relationship between the pinch roller 8 and the tensioning pinch roller 15 with respect to the coil A is based on the rotation of the embossing roll portion 9 , the speed relationship is such that the rotation of the pinch roller 8 is slow and the rotation of the tensioning pinch roller 15 is fast. The coil A is set so as to flatten the embossing and uneven patterns B and C without erasing them while the coil A is in tension, and also remove residual strain. As a result, the coil A becomes mountain-like in the above-mentioned area, twists and moves, does not flap at the entrance of the embossing roll section 9 , and shifts during embossing, making the pattern unclear. No more biting into it. Further, since the leveler 14 is in a state where tension is applied in one direction, it can be easily flattened and residual strain can be easily released. Of course, the tension within the above range is within the range of force that does not change the embossed pattern. Next, a test piece embossed using the above device will be compared with a tent piece embossed using a conventional device. Coil A is a colored galvanized iron plate (thickness: 0.27 mm) according to JIS-G-3312, and heater 7 is used as coil A.
The temperature was varied from 10 to 80°C, and the embossing depth was 0.7 mm with the primary embossing roll 10 and 0.9 mm with the main embossing roll 12, and the ratio of the concave pattern B to the convex pattern C was The ratio was 1:1, and the embossing speed was 30 mm/min.
In addition, a pinch roller 8 and a tensioning pinch roller 1 are also provided.
The speed difference between the five was set at about 3%. Note that the coating for coil A is an alkyd resin-based paint. When the temperature of the surface of coil A, the so-called temperature of the decorative film (in this case, the paint film) is changed from 0 to 80°C, the decorative film peels off, cracks, cracks, and shrinks. The state of d and flaws is shown in a line graph in Figure 5. Further, the flatness and degree of residual strain (pekotsuki) of the coil A sent out from the leveler 14 were visually observed. The testing methods include (1)
The apparent number of Pekotsuki existing per meter of coil A, (2) the distribution state of Pekotsuki, (3) the height difference of Pekotsuki (bottom and top surfaces of the designed irregularities and the actual bottom and top surfaces). (difference from surface) (4) Observations regarding the overall appearance are shown.

[Table] Furthermore, the results of a salt spray test (1500 hours) of the example (coil A when the decorative coating was heated to 50°C) and the coil formed according to the comparative example were as shown in the table below. .

[Table] What has been described above is only one embodiment of the embossing device according to the present invention, and it is possible to keep the temperature from the heater 7 to the tensioning pinch roller 15 within about 30 to 60°C, and to The number of stages of the leveler rollers can be increased depending on the distribution ratio, or the distribution can be arranged so that it spreads out from the center.
Furthermore, although not shown, the contours of the concave and convex patterns B and C can be embossed, and only the depth thereof can be embossed to a structure of about 20 to 80%. Also, the first
After processing with the next embossing roll 10, a clear coat of transparent resin can be applied and dried, and then processing can be performed with the main embossing roll 12. As described above, according to the embossing device of the present invention, there is no change in the force applied to the coil in the embossing zone, and embossing can be performed under constant tension at all times, so the embossed pattern does not shift during processing and is beautiful. Can form an uneven pattern. Since embossing is performed in two or more stages, deep embossing can be performed without difficulty. Since the primary embossing machine can apply ink and paint to any surface of the uneven pattern, it is possible to create a more three-dimensional effect and the work is easy. Because the decorative film is heated to make it soft enough for embossing, the decorative film may peel off from the steel plate during embossing, or the decorative film may become wrinkled, cracked, scratched, or crack. It is possible to form a beautiful decorative coating film with excellent weather resistance, scratch resistance, and chemical resistance without causing any damage. Flattening due to distortion formed by embossing can be easily and sufficiently removed by flattening under tension, making it possible to form a concavo-convex pattern with no flattening and full of three-dimensional effect. The lines are arranged in a straight line and the mechanism does not apply excessive force to the coil, allowing for smooth embossing.
Since the coil is heated and embossed, it is not affected by the environment. The straight line allows for high-speed embossing. It has the following characteristics.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram showing an example of an embossing device according to the present invention, Fig. 2 is a perspective view showing an example of an embossed pattern, and Figs. 3 a and b are enlarged explanations showing the processing order of uneven patterns in embossing. Figure 4 is a perspective view partially showing the leveler, which is a part of the leveler.
FIG. 5 is a characteristic diagram showing the temperature of the decorative film and the occurrence of cracks, etc. 1 ...Thin metal plate delivery section, 5...Heater section, 8...
...pinch roller, 9 ...emboss roll, 10...
...Primary embossing roll, 12...Main embossing roll, 14...Leveler, 15...Pinch roller for tension, A...Metal thin plate.

Claims (1)

[Claims] 1. In an apparatus for embossing a coiled thin metal plate having a decorative coating, there is provided a thin metal plate feeding unit consisting of an uncoiler and a pinch roller for feeding the thin metal plate, and a thin metal plate fed from the feeding unit. A loop part accommodates the thin metal plate in a slack state and adjusts the process before and after the process, a heater part heats the thin metal plate to about 30 to 60 degrees Celsius, a pinch roller that also serves as a guide and is placed after the heater part. A primary embossing roll for chipping printing or valley printing, which applies an arbitrary uneven pattern to a thin metal sheet sent out from a roller, and a main embossing roll for deep embossing and a heater disposed between the embossing rolls. An embossing roll portion consisting of a tuning mechanism, a leveler disposed after the roll, and a tensioning pinch roller disposed at the outlet of the leveler are arranged in a straight line, and the pinch roller also serving as a guide and the tensioning pinch roller are arranged in a straight line. An embossing device characterized by a tension state between pinch rollers.