JPH0478368B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an embossing device for forming irregularities of an arbitrary pattern on a thin metal plate having a decorative coating made of a decorative coating or film. In general, thin metal sheets, sometimes organic coated steel sheets, fluorine resin coated steel sheets, and PVC steel sheets are being 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 these steel plates were subjected to a salt spray test (JIS-Z-2371), it was found that
Rust and peeling of the paint film were observed on the bent parts after 1000 hours.
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. In order to eliminate these drawbacks, the present invention softens the steel plate and coating during embossing to exhibit ductility, and also allows residual strain during embossing to be easily corrected to create a beautiful and three-dimensional effect. This paper proposes an embossing device that can form a steel plate with a richly uneven patterned surface and excellent durability. DESCRIPTION OF THE PREFERRED EMBODIMENTS An embossing device according to the present invention will be described in detail below using 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), and an uncoiler 2 is shown.
and a pinch roller 3, and a flat metal thin plate (having a decorative coating such as a decorative coating or a decorative film) A wound into a coil is attached and constantly and effortlessly fed to the loop portion 4. It is for the purpose of 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, and the pinch roller 6 has upper and lower rollers 6a and 6b.
The coil A is clamped only at the start of the line, and thereafter the coil is used as a mere guide roller and is connected to the heater 7.
It is intended to be sent to In addition, the heater 7 is a decorative coating of the coil A, which is essentially the coil A itself.
This is to soften the decorative film by heating it to ~60°C to prevent the decorative film from peeling off from the steel plate or causing cracks, cracks, or cracks during embossing. The heating method is one of a hot air method, an open flame method, and a hot wire method. A pinch roller 8 feeds the coil A to the embossing roll 9 at a predetermined speed, and also functions as a brake against the movement of the coil A during embossing. Upper and lower rolls 9a and 9 are formed with a pattern consisting of male and female uneven parts of the embossing roll 9 on the outer peripheral surface.
An arbitrary pattern is applied to the coil A by meshing the upper and lower rolls 9a and 9b, and the gap between the upper and lower rolls 9a and 9b is determined by the height of the uneven portion and the thickness of the coil A. 10 is for correcting the residual strain existing in the embossed coil A with a leveler,
As shown in FIG. 2, upper rollers 10a ₁ , 10a ₂ , 1
0a ₃ ...10an (shown up to _10a3 in the figure), lower rollers _10b1 , _10b2 , _10b3 ...10bn (shown up to 10bn in the figure)
The rollers are arranged in a zigzag pattern in the order of 0b to ₄ ), and the gap G between the upper roller group 10a and the lower roller group 10b can be adjusted. 1
Reference numeral 1 is a tensioning pinch roller which rotates faster than the embossing roll 9 and allows the coil A to pass through the steps of the embossing roll 9 and the leveler 10 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, which continuously forms an embossed pattern on the coil A consisting of concave portions B and convex portions C as shown in FIG. 3, for example. . At this time, the embossing is performed with tension being applied to the coil A. The coil A sent out from the embossing roll 9 is corrected by a leveler 10 to remove residual strain during embossing while being stretched by a tensioning pinch roller 11, and then sent to the next process (not shown). It is something that will be done. Furthermore, the force relationship between the pinch roller 8 and the tensioning pinch roller 11 with respect to the coil A is based on the rotation of the embossing roll 9, and the speed relationship is such that the rotation of the pinch roller 8 is slow and the rotation of the tensioning pinch roller 11 is fast. , and embossing, flattening, and residual strain removal are performed with the coil A in tension. As a result, the coil A will no longer form a mountain in the above-mentioned area, twist and move, or flap at the entrance of the embossing roll 9, and will not shift during embossing, resulting in unclear patterns or double overlap. This will prevent you from getting caught. Further, since the leveler 10 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 region is within the range of forces that do not cause embossed changes. Next, a test piece embossed using the above-mentioned apparatus will be compared with a test piece embossed using a conventionally used apparatus. Coil A is a colored galvanized iron plate (thickness: 0.27 mm) according to JIS-G-3312, and heater 7 is used.
The temperature was varied from 10 to 80℃, the embossing depth was 0.9 mm, the ratio of concave part B to convex part C was 1:1, and the embossing speed was 30 m/min.
And so. Further, the speed difference between the pinch roller 8 and the tensioning pinch roller 11 was about 3%. Note that the coating for coil A is an alkyd resin-based paint. Then, when the temperature of the surface of the coil A, the so-called temperature of the decorative film (in this case, the paint film) is changed from 0 to 80°C, the cosmetic film peels off, cracks, cracks, and shrinks. , the state of flaws is shown in a line graph in Figure 4. Further, the flatness and degree of residual strain (pekotsuki) of the coil A sent out from the leveler 10 were visually observed. In addition, the inspection methods include (1) the apparent number of Pekotsuki depending on 1 meter of coil A, (2) the distribution state of Pekotsuki, and (3) the height difference of Pekotsuki (the bottom surface of the designed uneven part). , the difference between the top surface and the actual bottom surface and top surface), (4) Observations about 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 method according to the present invention, and the temperature from the heater 7 to the tensioning pinch roller 11 is kept within about 30 to 60°C, and the uneven portion B, Depending on the distribution ratio of C, the number of stages of the leveler rollers can be increased or the distribution can be arranged so as to spread out from the center. 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 uneven patterns. Because the decorative film was heated to make it soft enough for embossing, the decorative film could peel off from the steel plate during embossing, or the decorative film could wrinkle.
No cracks, scratches, or cracks.
It can form a beautiful decorative film with excellent weather resistance, scratch resistance, and chemical resistance. The residual strain caused by the distortion formed by embossing is easily and sufficiently removed by flattening under tension, and there is no unevenness.
It is possible to form uneven patterns with a 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 drawings]

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 partially showing a leveler that is a part of the embossing device, FIG. 3 is a perspective view showing an example of an embossed pattern, and FIG. FIG. 4 is a characteristic diagram showing the temperature of the decorative film and the occurrence of cracks, etc. 1... Metal thin plate feeding section, 5... Heater section, 9...
... Emboss roll, 10 ... Leveler, 11 ... 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 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 to loosen the thin metal plate. A loop part that accommodates the metal sheet in a flat state and adjusts the process before and after the process, a heater part that heats the thin metal plate to approximately 30 to 60 degrees Celsius, a pinch roller that also serves as a guide and is placed after the heater part, and the roller An embossing roll for forming an arbitrary uneven pattern on a thin metal sheet sent out from a metal sheet, 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 guide When the rotation of the embossing roll is used as a reference between the pinch roller that also serves as a guide and the pinch roller for tension, the speed relationship is set such that the rotation of the pinch roller that also serves as a guide is slow and the rotation of the tension pinch roller is fast. An embossing device characterized by being under the condition.