JPS5919776B2 - Side Seam Houhou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention uses an adhesive to prevent the cut end of the can body plate from being exposed inside the can, save the can body plate, and improve the crimping effect. This relates to the sand seaming method for cans.

Conventionally, most of the side seams of cans are seamed together as shown in Figure 3, but when the can body is soaked, the springback of the can body plates creates a large gap between the plates, making it difficult to obtain good adhesion. As the thickness of the seam increases, the polymerization width cannot be increased due to cost considerations, so the bonding area is also small.

Another possibility is to simply align the edges of the can body plate as shown in Figure 4, but in this case, the cut surface of the can body plate will be exposed inside the can, which may lead to rusting depending on the type of contents. This is an undesirable cause and has the disadvantage that it is difficult to apply pressure to the joint portion uniformly and to a predetermined magnitude. However, in this invention, one end edge of the can body plate is bent outward, and this part and the other end edge are overlapped, or the bent part is further bent and the other end edge is sandwiched to this part, so that the joining is not possible. This solves the above-mentioned drawbacks of the conventional method, such as applying a uniform and sufficient pressing force of 5 parts, saving material, and preventing the cut surface from being exposed inside the can.

That is, to explain the present invention with reference to the embodiment shown in FIG. The double edge 2 is polymerized via a synthetic resin adhesive 4, and this overlapping portion is pressurized to be fixed integrally.

In this case, the adhesive 4 covers the cut end 2a of the double edge 2 and is abutted and fixed over a relatively wide area. 15 Regarding the conventional side seam, as shown in Fig. 3, the bent green 6, T
A commonly used method is to fit the edges 8 and 9 of the can body plate 1 into the ears and apply adhesive 4 to the abutting portions of both bent edges. Method 20 has also been proposed in which an adhesive is interposed in the abutting portion of the stack, but this method has disadvantages in that the seam protrudes significantly and the cut surface is exposed inside the can.

However, in this invention, one end edge of the can body plate is made into a double edge, so that the cut surface is not exposed inside the can, and when pressurizing, it is possible to apply pressure evenly across the entire body, and relatively less material is required. This method has various effects and is a significant improvement over the conventional method.

[Brief explanation of drawings]

Fig. 1 is a partial cross-sectional view of the can body plate and both edges before being joined by the method of the present invention, Fig. 2 is a partial cross-sectional view of the same after the joint 30, and Fig. 3 is a part of the seam joint. Sectional view, FIG. 4 is a partial cross-sectional view of the overlapping joint. 1...Can body plate, 2...Double rim, 3.
...Other edge, 4...Adhesive, 6, 7...
...bent green, 8, 9...edge 35 edge.

Claims (1)

[Claims] 1. Bend one end edge of the can body plate on the joint side to the outside to a predetermined width, and overlap the outside of this bent part and the other end edge of the can body plate on the joint side with an adhesive and fix it by applying pressure. A method for side-seaming cans using adhesive.