JPS6215268B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for manufacturing a colored galvanized iron plate with an embossed pattern (hereinafter simply referred to as an embossed iron plate) for use in construction boards.

Metal plates are smooth and lack a three-dimensional or natural feel, so examples of ways to improve this include painting the surface with lysine, embossing it with uneven patterns,
Mastic painting is being done. In particular, to create a three-dimensional and natural look by embossing colored galvanized iron plates, a commercially available product is attached to the uncoiler.
This was guided to an embossing roll via a pinch roller and embossed with an uneven pattern. In other words, the 2-coat, 2-bake colored galvanized iron sheet production apparatus does not have a device for embossing during production. When a colored galvanized iron plate is embossed, the coating film on the galvanized iron plate cannot follow the deformation at the bent parts of the uneven pattern during embossing, causing cracks in the coating film or peeling. However, there were drawbacks such as corrosion of the galvanized iron plate from these cracks.

In order to eliminate these drawbacks, the present invention uses an embossing roll to form an uneven pattern on the galvanized iron plate before forming the upper and lower coating films in the production line for colored galvanized iron plates, thereby improving weather resistance and workability. This paper proposes an embossed iron plate manufacturing device that improves productivity and allows mass production at low cost.

EMBODIMENT OF THE INVENTION Below, the manufacturing apparatus of the embossed iron plate based on this invention is demonstrated in detail using drawing. FIG. 1 is an explanatory diagram showing an embossed iron plate manufacturing apparatus according to the present invention. In the figure, 1 is an uncoiler, and 2 is a thick galvanized iron plate wound into a coil. Reference numeral 3 denotes an entry side looper, and 4 a pretreatment section which has the function of forming a chemical conversion film on the coating surface by dipping or spraying in order to coat the galvanized iron plate 2. 5 is an embossing roll consisting of male and female rolls 6 and 7, and in order to add three-dimensionality and luxury to the thick plate, for example, a concave pattern A and a convex pattern B as shown in Fig. 2 are continuously formed. The height difference between the uneven patterns A and B is about 0.1 to 5 mm. In addition, the uneven patterns A and B include circles, triangles,
Patterns called by names such as elliptical, rod-shaped, citrus-shaped, drome-shaped, crater-shaped, cast-shaped, stipe-shaped, trabatine-shaped, stucco-shaped, spot-shaped, etc., as well as patterns whose names are unknown. It consists of one type. 8 is for applying an undercoat to the front and back surfaces of the galvanized iron plate that has been embossed with an undercoat coating machine, and 9 is for baking the paint applied by the undercoat coating machine 8 in a baking oven. be. Reference numeral 10 is a top coater for applying a top coat to the surface of the galvanized iron plate, and 11 is a baking oven for baking the top coat. Reference numeral 12 is for winding a so-called 2-coat, 2-bake colored galvanized iron plate, which is embossed with a coiler and covered with top and bottom coatings, into a coil shape.

Next, the operation of the embossed iron plate manufacturing apparatus according to the present invention will be explained. Note that most of the well-known pinch rollers, shears, stitches, etc. will not be explained or described. Therefore, as shown in Figure 1, the uncoiler 1
A galvanized iron plate (thickness: 0.27) wound into a coil is attached to the galvanized iron plate 2, and the galvanized iron plate 2 passes through a pinch roller shown by a dotted line, passes through an inlet looper 3, and a pretreatment section 4, and removes oil and dirt from the galvanized iron plate 2. is removed, a chemical conversion film is formed, and the embossing roll is supplied to the embossing roll 5 .
In step 5 , an uneven pattern (depth 0.9 mm) as shown in FIG. 2 was formed on the galvanized iron plate 2. Next, the galvanized iron plate 2 sent out from the embossing roll 5 is coated with, for example, an epoxy resin-based undercoat paint on its front and back surfaces via an undercoat coating machine 8, and then passed through a baking furnace 9.
A 10 micron undercoat film was formed. Next, a white top coat made of, for example, polyester resin is applied to one side of the galvanized iron plate 2 coated with the undercoat film using a top coat coating machine 10, and the coated paint is sent to a baking furnace 11 to form a film. A top coating film with a thickness of 10 microns was formed, and this was wound around the coiler 12 to complete the production of the embossed iron plate. The embossed iron plate manufactured in this way has a cross section with top and undercoating films C and D formed on the front and back surfaces of the galvanized iron plate 2, as shown in FIG. In addition, the corrosion resistance of the embossed iron plate manufactured by the embossed iron plate manufacturing apparatus according to the present invention (salt water spray test JIS-Z-2371 1000 hours),
When the appearance was compared with a sample obtained by embossing a commercially available colored galvanized iron plate with the same pattern and depth as above using an embossing roll, the following results were obtained. That is, in the salt spray test, the embossed iron plate manufactured in the example had no cracks in the coating, no whitening, no red rust, and the contrast between the uneven patterns A and B was clear, giving it a three-dimensional effect. It was encouraged. In contrast, the painted galvanized iron sheet of the comparative example had cracks in the decorative surface coating at the bends with an uneven pattern, and part of the coating had peeled off from the galvanized iron plate, and red rust appeared on the bends within 72 hours. It was occurring. In addition, since the appearance was simply a concavo-convex pattern, the three-dimensional effect appeared to be inferior to that of the example. Furthermore, because the embossing was performed after pretreatment, no collapse or shift was observed in the uneven pattern, and the top and bottom paints applied well.

As described above, according to the embossed iron plate manufacturing apparatus according to the present invention, since an arbitrary pattern is embossed on a galvanized iron plate and then two layers of coating film are individually baked, cracks in the coating film are formed at the bent portions of the uneven pattern. It is characterized by being able to produce embossed iron plates with excellent corrosion resistance without the occurrence of corrosion. In addition, since the paint film is formed twice after embossing, the uneven pattern affects the thickness of the paint film, which contributes to enhancing the three-dimensional effect, making it possible to manufacture embossed iron plates with a beautiful three-dimensional appearance. It has characteristics. Furthermore, in order to manufacture embossed iron plates, it is only necessary to incorporate an emboss roll into a line that is currently in operation, making it possible to manufacture them at low cost.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an example of a manufacturing apparatus for a colored galvanized iron plate with an embossed pattern according to the present invention, and FIG.
3 are a perspective view and an end view of an example of an embossed pattern. 1... Uncoiler, 2... Galvanized iron plate, 5 ... Embossing roll, 8... Undercoat applicator, 9, 11...
...Baking furnace, 10...Top coating machine.

Claims (1)

[Claims] 1. An uncoiler equipped with a galvanized iron plate wound into a coil, an inlet looper that stores the galvanized iron plate sent out from the uncoiler, a pretreatment section that preprocesses the galvanized iron plate supplied from the looper, and an embossing roll for embossing a concavo-convex pattern on a galvanized iron plate sent out from a processing section;
A roll coater-type undercoat applicator that applies an undercoat to the galvanized iron sheet sent from the embossing roll, a baking furnace that bakes the paint on the galvanized iron sheet with the undercoat sent out from the applicator, and a baking furnace that A top coating machine applies a top coat to only one surface of the galvanized iron sheet sent out, a baking furnace that bakes the top coat of the galvanized iron sheet sent out from the coating machine, and a coating machine that wraps the colored galvanized iron sheet sent out from the baking furnace. A manufacturing device for a colored galvanized iron sheet with an embossed pattern, characterized in that a coiler and a coiler are arranged in series.