JPS60152334A - Embossing method - Google Patents

Abstract

PURPOSE:To straighten easily a residual distortion, and to obtain an uneven pattern which is beautiful and abounds in cubic feeling, by heating a metallic thin sheet to a specified temperature, and executing in order an embossment and a straightening of the residual distortion under a tension. CONSTITUTION:A coil A installed to an uncoiler 1 is drawn by the first pinch roller 2, and fed to a loop part 3. Subsequently, the coil A is guided by a pinch roller 4, fed to a heater 5, heated to about 30-60 deg.C, its face film is softened to a prescribed hardness, and it is fed to an embossing roll 7. In this roll, an embossing pattern consisting of a recessed part and a projecting part is formed continuously on the coil A. The coil A discharged from the embossing roll 7 is straightened by a leveler 8 in a state that the residual distortion at the time of embossing is drawn by the fourth pinch roller 9, and fed to the next process.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an embossing method for forming irregularities in an arbitrary pattern on a flat metal thin plate having a decorative coating (paint or film).

In general, thin metal sheets, particularly organic coated steel sheets, fluorocarbon resin coated steel sheets, and vinyl chloride 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 been shifting from 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 with an irregular pattern formed by embossing is commercially available.
After 500 to 1000 hours, rust, peeling of the paint film, or film was observed at the bent portion. In addition, the surface of this type of steel plate is
When observed at twice the magnification, the paint film was partially peeled off and wrinkled or scratched at the bent parts of the concave and convex parts.
It was broken, thinned, and cracked.

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 method that can produce a highly durable steel plate with a richly uneven patterned surface.

Below, the embossing method according to the present invention will be explained in detail using the drawings. FIG. 1 is a schematic diagram showing the configuration of an apparatus used to carry out the above method, and 1 is an uncoiler on which a thin metal plate A (hereinafter simply referred to as a coil) having a decorative film wound into a coil is attached, and a supply Accordingly, it is fed to the first pinch roller 2. The first pinch roller 2 is driven by a motor (not shown) and feeds the coil 8 to the loop section 3 at a predetermined speed. The loop portion 3 controls the supply state of the coil A when embossing the coil 8, and also functions as a relief portion to prevent a large force from being suddenly applied to the coil. A guide 1 roller 4 guides and feeds the coil 8 fed from the loop section 3 to the heater 5, and when the coil A is pinched by the second pinch roller 6, the upper roller 4
a is separated from the coil 8 and the lower roller 4b is being driven.
functions as Guy 1. In addition, the heater 5
The decorative film of coil A and the steel plate are heated to approximately 30 to 60°C to soften the baked decorative film and prevent the decorative film from peeling off from the steel plate during embossing, cracking, scratching, etc.
This prevents cracks and cracks from occurring. The heating method is one of hot air method, direct fire method, and FA wire method. A third pinch roller 6 feeds the coil 'A to the embossing roll 7 at a predetermined speed and also functions as a brake against the movement of the coil A during embossing. The embossing roll 7 has a pattern consisting of male and female uneven parts formed on its outer circumferential surface, and the upper and lower rolls 7a and 7b are engaged to apply a desired pattern to the coil A, and the gears of the upper and lower rolls 7a and 7b・The number 2 is determined by the height of the uneven part and the thickness of the coil A. 8a+, 8a2.8a3
・ ・ ・ ・8an (The figure shows up to 8a3.)
Lower rollers 8b1.8b2.8b3...8bn (shown up to 8b4 in the figure) are arranged in a zigzag pattern, and the gap G between the upper roller group 8a and the lower roller group 8b can be adjusted. It is. Reference numeral 9 denotes a fourth pinch roller which rotates faster than the embossing roll 7 and allows the coil A to pass through the steps of the embossing roll 7 and the leveler 8 while being stretched.

Next, the embossing method according to the present invention will be explained. First, the coil 8 attached to the uncoiler 1 is pulled by the first pinch 1:]-cla and is fed to the loop portion 3. At this time, even if the coil A is pulled by the pinch 1 cola 2, the brake device (
(not shown) so that it is fed under a certain permissible tension. Then, the coil A is guided to the second pinch roller 4 through the loop part 3, and is heated to the heater 5.
It will be sent to The second pinch roller 4 functions as a pinch roller only when the coil A reaches the third pinch roller 6 for the first time, and after that, the upper roller 4a
is raised, and the lower roller 4b acts as an instep roller.

Next, the coil A fed to the heater 5 has a diameter of about 30 to 60"
The decorative film is heated to a temperature of In other words, if the JJII temperature exceeds the total temperature ゛C, the decorative coating may peel off from the steel plate because the resin content of the coating will become close to its softening point or the hardness will decrease too much. This is because there is a risk of shrinkage or lack of scratch resistance.
If the temperature is below 0°C, the resin component of the decorative film loses its softness and increases its hardness, which may cause the decorative film to crack or significantly reduce its scratch resistance. Next, the coil A that has left the heater 5 is fed to the embossing roll 7 by the rotation of the third and seventh rollers 6, and the coil A has a concave portion B and a convex portion C as shown in FIG. A continuous embossed pattern is formed. The coil A that has left the embossing roll 7 is corrected by a leveler 8 for residual distortion during embossing by a tension 6z by a fourth pinch roller 9, and then sent to the next process. Furthermore, the force relationship between the third pinch roller 6 and the fourth pinch roller 9 with respect to the coil A will be explained. That is, when the rotation of the embossing roll 7 is used as a reference, the rotation of the third pinch roller 6 is set to be slow and the rotation of the fourth pinch roller 9 is fast. ]- to perform flattening and removal of residual distortion. As a result, the coil A becomes mountain-shaped in the above-mentioned area, twists and moves, and does not flap at the entrance of the embossing roll 7, and the pattern becomes unclear due to the coil A slipping during embossing. No more biting into it. Further, since the leveler 8 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 in the above region is within the range of force that does not change the embossed pattern.

Next, examples will be explained.

First, coil 8 is a colored galvanized iron plate (plate thickness 0.27 m + t) according to JIS-G-3312, with a width of 1000 fins and a length of 2000 m, and the temperature change range of heater 5 is from 10 to 80 degrees Celsius. , embossing depth 0.9
The ratio of the fin, concave portion B and convex portion C was set to 1=1, and the embossing speed was 30 m/min. Also,
The speed difference between the third pinch row 96 and the fourth pinch roller 9 is 1
It was set at ~5%.

Note that the paint for coil A is an alkyd resin-based paint. Then, the temperature of the surface of the coil A, the so-called decorative film temperature, is changed from 10 to 80°C.
Fig. 4 shows the states of the peeled areas, cracks ◎, cracks ○, shrinkage number ■, and scratches number ■ in a line graph.

In addition, the flatness and degree of residual strain (pekokki) of the coil A sent out from the rehera 8 were visually observed. As a comparative example, the heating temperature is shown in FIG. In this case, The results were as shown in the table below. In addition, the scratching method is (1)
The apparent number of pekokki existing per meter of coil, (2) the distribution state of pekokki, (3) the height difference of pekokki (the bottom surface of the designed uneven part, the top surface and the actual bottom surface) ,
(difference from the top surface) shows observations about the overall appearance of f4+.

Further, the results of a salt spray test (1500 hours) of the coils formed in the example (coil A when the decorative coating was heated to 50''C) and the comparative example were as shown in the table below.

11 - Below margin 11~ What has been described above is only one embodiment of the embossing method according to the present invention, and the temperature from the heater 5 to the fourth pinch roller 9 is kept within about 30 to 60°C, Depending on the distribution ratio of the uneven portions B and 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 method according to 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 a beautiful uneven pattern can be formed. ■ Softening power that allows the decorative film to be heated and follow the embossing process.) A beautiful decorative film that does not cause scratches, scratches, or cracks, and has excellent weather resistance, scratch resistance, and chemical resistance. It becomes a surface. ■The residual strain caused by 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 peckochi and full of three-dimensional effect. It has the following characteristics.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the configuration of an apparatus used for implementing the embossing method according to the present invention, Fig. 2 is a perspective view partially showing a rehera, which is a part of the device, and Fig. 3 is a perspective view showing an example of an embossed pattern. 4 are characteristic diagrams showing the temperature of the decorative film surface and the occurrence of cracks, etc. DESCRIPTION OF SYMBOLS 1... Uncoiler, 5... Heater, 7... Emboss roll, 8... Refiller, 9... Fourth pinch roller, A... Metal thin plate. Name / Diagram Z Z Diagram name 3 Diagram Δ Diagram

Claims (1)

[Claims] (11 When forming irregularities in an arbitrary pattern on a thin metal plate with a decorative coating by enphos processing, the thin metal plate is
Embossed at a temperature of 0 to 60℃ and under tension.
An embossing method characterized in that the process is performed in the order of correcting residual distortion.