JPS63112B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for simultaneously coating the outer circumferential surface of a can body of a seamless can for cans and the outer surface of an annular tapered portion following the lower portion of the outer circumferential surface of the can body by roll coating.

Seamless steel cans need to be completely coated with a coating film having a rust-preventing effect on their outer surface to prevent rust, and the conventional method for doing this is generally divided into the following four steps.

Coating the entire surface of the can body (roll coating) Coating the surface of the tapered portion of the can bottom (roll coating) Coating the surface of the rim portion of the can bottom (roll coating) Coating the surface of the dome portion of the can bottom (spray coating) In contrast, the present invention uses the steps of and. The purpose of the present invention is to provide a method of combining the two processes into one process and an apparatus for carrying out the process, as described below.

(1) One end of the cylindrical outer circumferential surface of the applicator roll is raised outward to form a slope, and the outer circumferential surface of the can body of the seamless can and the outer surface of the annular tapered part continuing to the lower part of the outer circumferential surface of the can body are connected to the outer circumferential surface of the can body of the seamless can. A method for painting the external surface of a seamless can, characterized in that painting is performed simultaneously by bringing the cylindrical outer circumferential surface and the slope into contact with each other.

(2) an applicator roll having an outwardly raised slope at one end of a cylindrical outer circumferential surface, and an applicator at one end of the cylindrical outer circumferential surface that abuts the cylindrical outer circumferential surface of the applicator roll in the lower longitudinal axis; A transfer roll having a concave slope that abuts the outwardly raised slope of the roll and a cylindrical raised surface at the apex that is raised outward again, and a distance between the cylindrical outer circumferential surface of the transfer roll and a coating amount adjustment clearance. The rollers are arranged parallel to each other downwardly, and have annular protrusions at one end that cooperate with the transfer roll to form a continuous clearance for adjusting the amount of application, and further maintain the clearance at the outer periphery of the other end and apply the transfer roll. 1. A seamless can exterior coating device comprising: a bearer roll having an annular surface that is in pressure contact with a transfer roll surface.

Next, preferred embodiments of the present invention will be described based on the embodiments shown in the figures.

Embodiment Fig. 1 is a sectional view of a seamless can embodying the present invention, Fig. 2 is a front view of the main parts of the device of the present invention in an assembled state, and Fig. 3 is a roll view of Fig. 2 viewed from the right side. It is an explanatory diagram showing a mutual contact state.

In Fig. 1, 1 is a can body of a seamless can, 11 is a cylindrical can body, 12 is an annular tapered portion of the can bottom, 13 is an annular rim portion of the can bottom, and 14 is a central dome portion of the can bottom. The metal composition is C0.13% or less,
The body of the seamless can is made by drawing and ironing of a cold-rolled steel plate with less than 0.05% Si, less than 0.60% Mn, and a plate thickness of about 0.32mm, which has been surface-treated with tin plating or chromate. 2 is a coating film,
21 is a coating film on the surface of the cylindrical can body, and 22 is a coating film on the surface of the annular tapered portion of the can bottom (the coating film portion is exaggerated).

In FIGS. 2 and 3, 3 is an applicator roll, and has a cylindrical outer peripheral surface 31 with a diameter of 430 mm.
It consists of a slope 32 extending outward by 5 mm and protruding outward to a height of 5 mm at one end in the longitudinal direction of 115 mm, and a cylindrical flange 33 having a length of 7 mm, and has a rubber layer on the outer periphery.

4 is a transfer roll with a diameter of 250
Cylindrical outer surface 41 with a length of 153 mm and 9 mm at one end
A slope 42 depressed to a depth of 9 mm in the extension of
It has a cylinder 43 with a diameter of 232 mm and a length of 7 mm at its tip, and a cylinder 44 with a diameter of 250 mm and a length of 5 mm at its tip. The cylindrical outer circumferential surfaces 41 and 31 and the inclined surfaces 42 and 32 are in line contact with each other and rotate in opposite directions. 5 is a bearer roll, which includes, from the left side of FIG. 2, an annular protrusion 6 with a diameter of 150 mm and a length of 4 mm, a cylindrical outer circumferential surface 51 with a length of 149 mm, and a slope 52 extending 9 mm to a height of 9 mm; 6 from the top
Polished hard steel that has undergone heat treatment and has a cylinder 53 extending 2 mm in length, a cylinder 54 with a diameter of 146 mm extending 2 mm in length from its end, and an annular protrusion 7 with a diameter of 150 mm extending 4 mm to the right from the end face. The surfaces of the cylinders 41 and 44 of the transfer roll are pressed into contact with the annular projections 6 and 7, forming a clearance 8 for adjusting the amount of application, and rotate.
The coating thickness varies depending on the type of can and the paint used.
A bearer roll 5 provided with an appropriate clearance 8 is prepared according to various changes.

The paint is applied to the bearer roll 5 as shown at 9 in FIG.
The applicator roll 3 is supplied to the roll rotation entrance side of the clearance 8 between the transfer roll 4 and the applicator roll 3.
transported to the surface.

The paint conveyed to the applicator roll 3 is
A cylindrical outer circumferential surface 31 of the applicator roll 3 made of a rubber surface layer and an inclined surface 32 raised outward from the outer circumferential surface 31 of the applicator roll 3.
are in continuous line contact with the cylindrical can body 11 of the metal can body 1 and the annular tapered portion 12 of the can bottom ring continuous thereto, so that the can body 1 can be removed from the applicator roll 3. The coating film roll-coated by transfer onto the surface forms a uniform continuous surface.

That is, according to the present invention, the painting process, which was conventionally performed in two steps, can be performed in one step, which not only makes it possible to significantly reduce equipment and operation costs, but also reduces the amount of paint film after painting. formed a uniform continuous surface, and significant improvements were seen in both performance and decoration.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a seamless can embodying the present invention, Fig. 2 is a front view of the main parts of the device of the present invention in an assembled state, and Fig. 3 is a roll view of Fig. 2 viewed from the right side. It is an explanatory diagram showing a mutual contact state. 1: can body, 2: coating film, 3: applicator roll, 4: transfer roll, 5: bearer roll, 6: annular projection, 7: annular projection, 8: clearance for adjusting application amount, 9: paint.

Claims (1)

[Claims] 1. One end of the cylindrical outer circumferential surface of the applicator roll is raised outward to form a slope, and the outer circumferential surface of the can body of the seamless can and the outer surface of the annular tapered part continuing to the lower part of the outer circumferential surface of the can body of the seamless can. A method for painting an external surface of a seamless can, characterized in that painting is performed simultaneously by bringing the cylindrical outer circumferential surface of the applicator roll into contact with the slope. 2. An applicator roll having an outwardly raised slope at one end of a cylindrical outer circumferential surface, and a cylindrical outer circumferential surface that abuts the cylindrical outer circumferential surface of the applicator roll in the lower longitudinal axis. A transfer roll that is raised outward again and has a cylindrical raised surface at its top end with a concave slope that abuts the outward raised slope, and a lower part with a distance between the cylindrical outer peripheral surface of the transfer roll and the clearance for adjusting the amount of application. The rollers are arranged parallel to each other, and have an annular protrusion at one end that cooperates with the transfer roll to form a continuous clearance for adjusting the amount of application, and further maintains the clearance at the outer periphery of the other end to transfer the transfer roller. 1. A seamless can exterior coating device, comprising: a bearer roll having an annular surface that comes into pressure contact with a roll surface.