JPS6130981B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for producing a can in which the seam portion and the flange seam portion are tightly joined by interposing an adhesive on the seam edge of the can body plate and the flange edges between the can body plate and the top plate and the base plate. It is about improvement.

Conventionally, it has been proposed that cans are made using plated iron plates, and the edges of the can body plate and the flange edges of the can body, top plate, and base plate are closely joined using an adhesive. (Special Publication No. 55-6019).

In the above publication, as shown in Figure 8, cuts are made at the four corners of the can body plate to a depth twice as deep as the flange edge.
The overlapping of the four iron plates at the seam part changes to two sheets at the lower end point P of the flange seam part, and as shown in A can extending to a point is proposed.

However, in the former case (Fig. 8), the cross section of the seam part changes rapidly at the flange seam part, so when it receives an impact, the tip of the seam part intersects with the flange seam part becomes unstable, creating a gap and causing liquid leakage. Problems that tend to cause this have been pointed out.

In the latter case (Fig. 9), the flange seam is densely formed by overlapping many iron plates and looks sturdy at first glance, but excessive adhesive was applied to the edges of the iron plates and the edges of the flange during can manufacturing. The agent was trapped by the overlapping seams and the tightening of the flange, and there was no place for it to escape, so it was thought to accumulate between the iron plates, preventing the iron plates from coming into close contact and causing liquid leakage.

An object of the present invention is to provide a can that is more completely prevented from leaking by strengthening the upper and lower two points where the upper and lower extensions of the flange portion intersect with the flange tightening portion.

In the present invention, by forming a chamber R in which surplus adhesive accumulates inside the flange seaming part that intersects both ends of the seam part, the surplus adhesive collects in the chamber R during flange seaming during can manufacturing. The iron plates can be brought into close contact with each other, completely preventing liquid leakage.

The can body plate 1 constituting the can of the present invention is an iron plate plated with metal chrome, and furthermore, the inner surface is coated with hydrated chromium oxide over the entire surface except for the seam edges 3 and flange edges 4.

Cuts 2 are made in the four corners of the can body plate 1 as is known in the art,
Adhesive (Tetsukron U (trade name), a water-soluble resin manufactured by Nippon Paint Co., Ltd.) is applied in advance to the joint edge 3 and the upper and lower flange edges 4.

The depth of the cut 2 is the height of the flange edge 4 (2
mm) and shallower than twice the flange edge to an appropriate depth (3 to 3.6 mm).
Further, the tip of the flange edge 4 with respect to one of the joint edges 3 is cut obliquely to a position where it is lowered by the thickness of two iron plates toward the notch 2 to form an inclined side 5.

The can body plate 1 is bent into a rectangular cylindrical body as is known in the art, the edges 3 are folded back to opposite sides as shown in FIG. 3, and the folded edges 3 are interlocked and pressed together as shown in FIG. The interlocking part 8 is glued.

At this time, the flange edge 4 is doubled at the intersection with the seam part 8, and the flange edge 4 having the inclined side 5 is located on the outside.

Next, when the upper and lower flange edges 4 of the can body are bent horizontally outward, the outer flange edges pass through the inner circumference due to horizontal bending, but the height of the flange edge 4 is lowered by the inclined side 5. is shortened, the outer peripheral edges of the two flange edges 4 are aligned in a straight line by performing the primary bending.

Since the depth of the notch 2 on the flange edge is deep, the seam portion 8 extends below the flange bending line 9 shown by the dashed line.

Next, the top plate 6 and the bottom plate are stacked on the horizontal flange which has been bent to the first degree, and the flange 1 on the outer periphery of the top and bottom plate is
At the same time, the flange bent portion 7 of the can body, which is horizontally bent, is tightened using a curling device in a known manner to form a flange tightened portion 11.

By providing the roller of the curling device with a notch in advance at a position corresponding to the seam part, the intersection of the seam part and the flange seam part is pushed inward when the flange is wound, and the flange seam part 11 is uniform. A can is formed without outward protrusions.

When the flange edge 4 is bent for the first time (FIG. 6), the cut 2 at the upper and lower ends of the iron plate of the seam part 8 is cut deeper than the flange bending line 9, so the flange is bent for the first time and the flange of the top plate 6 is bent. When 10 are stacked, a room R with ample room for the excess adhesive to escape is formed inside.

The chamber R remains inside the flange even after the secondary curling of the flange seaming part (Fig. 7), and therefore, the excess adhesive fills the chamber R and solidifies, resulting in can manufacturing. At this time, the intersection between the seam and the flange seam, which is most likely to cause liquid leakage, is strengthened to achieve an even more liquid-tight effect, and the iron plates are tightly joined together to complete a complete flange.

Moreover, in the present invention, the four iron plates of the seam part extend halfway inside the flange seam part and constitute a part of the flange. In this case, sudden bending of the iron plate does not occur, and problems caused by trapping of adhesive are also avoided, which solves the problems of conventional cans and realizes an even better liquid-tight effect.

[Brief explanation of the drawing]

Fig. 1 is an expanded plan view of the body plate of the can according to the present invention, Fig. 2 is an enlarged view of the part surrounded by the broken line in Fig. 1, Fig. 3 is an enlarged slope view of the edge of the seam, and Fig. 4. Figure 5 is a slope view of the primary machining of the flange on the can body plate, and Figure 4 is the
Fig. 6 is an enlarged sectional view taken along the line and viewed in the direction of the arrow; Fig. 6 is an enlarged sectional view of the can body with the flange bent for the first time and the top plate stacked; Fig. 7 is the flange tightening of the can. FIGS. 8 and 9 are enlarged sectional views of the flange seaming part of a conventional can. 1... Can body plate, 2... Notch, 3... Edge of seam, 4... Edge of flange, 8... Edge, 11...
...Flange seaming part.

Claims (1)

[Scope of Claims] 1. In a can in which the seam part 8 of the can body plate and the flange seam parts 11 of the body plate, top plate, and bottom plate 6 are joined via adhesive, flange edges are provided at the four corners of the can body plate 1. 4
A cut 2 with a depth deeper than twice the height and shorter than twice the height is formed to form the seam part 8 of the can body plate 1, and the can body plate thickness is A can with a chamber R corresponding to two cans filled with adhesive and solidified. 2 Flange edge 4 facing one side edge 3 of the can body plate
The can according to claim 1, wherein the upper and lower sides of the can are inclined sides 5 that are inclined toward the upper and lower notches 2, 2.