JPS6340624A - Manufacture of can shell with bead - Google Patents

Abstract

PURPOSE:To prevent the flawing of a correction paint due to the whole periphery beading and to obtain a good bead by performing the whole periphery beading after correcting at least the inner side of a side seaming part with a paint by performing the prebeading of one part of the whole peripheral beads on the side seaming part of a cylindrical can shell. CONSTITUTION:A plate-shaped blank is formed in a cylindrical shape, both side ends are overlapped, a side seam 4 is formed by an adhesion or welding and a can shell 2 is made. Plural prebeads 3 are then formed on the side seam 4 of the can shell 2. These prebeads 3 make one part of the whole peripheral beads 3a of the can shell 2 and are formed at the position across the side seam 4 by coinciding with approximately the pitch and crossectional shape of the while peripheral beads 3a. The inner face of the side seam 4 or the inner and outer faces of after forming the prebeads 3 are corrected by a paint 9 or 8. The whole peripheral beads 3a coincident with the prebeads 3 are then formed on the can shell 2.

Description

Detailed Description of the Invention (a) Purpose of the Invention [Field of Industrial Application] The present invention provides a beaded can with a clean side seam and a bead all around the can for filling and storing food and beverages or other articles thereof. The present invention relates to a method of manufacturing a body.

[Prior Art] The can body of this type of can is made by forming a cylinder from a plate-shaped metal material, overlapping both ends and forming a side seam by gluing or welding, and then applying paint to the side seam. This is corrected by painting the metal to cover the exposed metal.

On the other hand, when this type of can is filled with contents and sterilized by heating for 1.1 times, the internal pressure of the can increases and the can bulges and deforms, or the can is compressed by atmospheric pressure during storage. The can body may shrink and deform due to the pressure difference between the inside and outside of the can.In order to prevent these deformations and prepare a margin for deformation, the can IS1 is plastically shaped into a corrugated shape. Gold processing is sometimes performed to form a bead all around the circumference.

[Problems to be solved by the invention] However, when bead processing is applied to the side seam correction layer, the material other than the side seam of the can body is easy to process, but the side seam The material at the seam is rough and the processing is difficult, so the correction coating is easily damaged and the metal is exposed.

In particular, when using J3 for cans such as welded cans in which the iron surface is exposed as is at the side seam, the effect of the 2I correction is almost completely reduced. In order to prevent this, it is possible to correct the bead processing, but the bead 1111T
Mechanical detection of the rear id seam becomes difficult,
Therefore, the position of the lead seam is not determined, and it is impossible with the current design to correct only one lead seam. It is possible to correct the inner surface of the iron by spraying paint not only on the 1-noid shim part, but it is disadvantageous in terms of loss.Also, on the outer surface of the can, the paint has already been printed on the iron cylinder. Even that is impossible because of the

This invention was made in view of the above-mentioned circumstances, and even if bead processing is applied, the correction of the I side seam portion is not possible.
The purpose of this project is to promote a method of manufacturing beaded cans that are free from scratches, but cannot be made using conventional machinery as is.

(b) Structure and operation of the invention [Means for solving the problem] Corresponding to this object, the method for manufacturing a beaded iron barrel of the present invention provides a method for manufacturing a beaded iron barrel in which a plurality of A method for manufacturing a can body having a bead all around the circumference and a side seam formed by welding or gluing, the method comprising: forming a plate-like material into a cylindrical shape, joining both ends together, and forming the side seam by gluing or welding. to form a cylindrical can body.'
IJ I51 step, then a pre-bead processing step of forming a pre-bead on the side seam of the can body manufactured in the above-mentioned barrel making step, and then spraying coating 1 on at least the inside of the side seam to form a pre-bead on the side seam. The present invention is characterized in that it includes a side seam correction step for correcting the seams, and a bead processing step for forming and covering the entire circumference bead on the back of the weave, which matches the pre-bead.

The details of this invention will be explained below with reference to the drawings showing one embodiment.

FIG. 1 shows a bead can 1, in which a plurality of circumferential beads 3a are formed by bead processing at predetermined intervals in the axial direction. The can body manufacturing method of the invention is a manufacturing method for manufacturing such a can body 2a.

The 1llJ manufacturing process of the bead can 1 in this can body manufacturing method is as follows. That is, as shown in FIG. 5, in the barrel manufacturing process (FIG. 5(a)), a plate-like material is formed into a cylinder, both ends are overlapped, and a side seam 4 is formed by gluing or melting. Then, remove the cylindrical whale 2b.

The cross-sectional shape of the can body 2b in this case (the plane taken along line AA in FIG. 5(a)) is as shown in FIG. 6(a).

Next, in the pre-bead processing step (Fig. 5(b)), I
Form pre-bead 3 on side seam 4 of Ill 2 b. The cross-sectional shape of the pre-bead 3 in this case (the B-B plane in FIG. 5(b)) is as shown in FIG. 6(b).

Next, in the side seam correction process (FIG. 5(C)), the can body 2b with the pre-bead 3 formed thereon is sprayed with paint on both the inner and outer sides of the side seam 4 to correct the side seam 4. Get 2.

Here, the inner correction is particularly related to the contents.

In this case, the cross-sectional shape of the portion of the side seam where the pre-bead 3 is formed (C-C section r3 R in FIG. 5(C)) is as shown in FIG. 6(C).

The can body 2 thus completed is shown in particular in FIGS. 2, 3 and 4. That is, as shown in FIGS. 2, 3, and 4, the can y2 has a plurality of pre-beads 3 formed by pre-bead processing. This pre-bead 3t and the entire circumference bead 3a (first
The pre-bead 3 is formed at a position that spans the side seam 4;
It is not formed in other parts of the can body 2 that are not covered. The pitch and cross-sectional shape of the pre-bead 3 almost match the pitch and cross-sectional shape of the entire circumference bead to be formed later. Further, the length of the pre-bead 3 in the circumferential direction is selected within a range such that the side seam 4 is not affected by the bead processing for forming the circumferential bead 3a at 1u, or the effect is small. Pre-bead 3 was formed (
The inner or inner and outer surfaces of the side seams 4 are corrected with a correction paint 9 or 8 and 9.

In the JIIm2 completed in this way, a bead 3b matching the pre-bead 3 is further formed in the bead processing process (FIG. 5(d)), and a bead 3b matching the pre-bead 3 is formed on the can body 2a (first Figure) is completed.

In this case, the cross-sectional shape of the vicinity of the side seam on the right side of the bead (D-D section plane in Fig. 5(d)) is shown in Fig. 6(
As shown in d).

(C) Effects of the Invention According to the method for manufacturing a can body constructed as described above, a pre-bead 3 forming a part of the entire circumference bead is formed in advance at the largest side seam portion during bead processing. In this state, at least the inside of the side seam is corrected, and then the entire circumference bead is processed, so the lead seam will not be affected by the full circumference bead processing, which will be performed later. The applied correction coating V1 will not be old and a good bead can can be obtained. Correction of the side seam part is carried out with only the pre-bead processed before the full circumference bead is added, so it is easy to determine the position of the side seam, and it is possible to correct the side seam accurately. Can be done.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a bead can, FIG. 2 is a perspective view of a can body with pre-beads manufactured by the method for manufacturing can ISI according to an embodiment of the present invention, and FIG. 3 is a perspective view of a can body shown in FIG. A front view of the can body with pre-beads, Figure 1 is IV in Figure 3.
- A partial side view of the IV part FIG. 5 is an explanatory view showing the manufacturing process of the can body of the present invention, and FIG. 6 is shown in FIG. 5! It is an explanatory view showing a cross section of a can body after completing each step of the IJ construction process. 1... Bead &? 2, 2a... Can body 3.
...Pre-bead 3a...All-around bead 4...
Side Seam Patent Applicant Toyo Seikan Co., Ltd. Representative Patent Attorney Osamu Kawa N. Figure 1 Figure 2 Figure 3 Figure 4 (a) (b) (q) (b) (C) (d) (C ) (d)

Claims (1)

[Claims] A method for manufacturing a can body in which the can body has a plurality of circumferential beads at predetermined intervals in the axial direction, and side seams are formed by welding or gluing. a body-making process in which a cylindrical can body is manufactured by overlapping and forming a side seam by gluing or welding;
Next, a pre-bead processing step of forming a pre-bead on the side seam of the can body manufactured in the barrel manufacturing step, and a side seam correction step of correcting the side seam by spraying paint on at least the inside of the side seam. and,
Next, a bead processing step of forming a bead on the can body all around the circumference that coincides with the pre-bead.