JPH0318352Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a can with good sealing performance.

Looking at an example of a conventional can manufacturing process in Fig. 1, the same-shaped notches 2 such as squares or rectangular shapes are formed at the four corners of a can body plate 1, and a seam bend line 3 and a seam bend line 4 are set. Apply adhesive 6 to the lower part 5 and attach the upper part 7.
It is formed by joining the edges together and then wrapping the end plates together.

When the cans are joined together, vertical holes 8 and 9 are inevitably formed at the ends of the cans due to the thickness of the can material.

The vertical hole 8 where the adhesive 6 is located is not filled with the adhesive 6 or directly communicates with the contents such as liquid inside the can, so there is no problem with sealing. As a result, the contents permeate as shown by arrow 10 and escape up and down inside the vertical hole 9, reducing the sealing performance.

In particular, when aligning the outer edges as shown in Figure 1 and 2, inserting the chuck into the chuck 11, and tightening the end plate, the arrow mark 1
Since the zero gap is likely to widen, the sealing performance of the vertical hole 9 has become even more important.

The purpose of the present invention is to improve the sealing performance of the vertical hole 9, by setting the intersection of the seam bend line and the seaming bend line of the can body plate within the plane of the can body plate. The present invention provides a sealed can in which an overlapping portion is formed above and below a vertical hole created by seaming, and the upper and lower openings of the vertical hole are closed with one surface of the overlapping portion when the end plates are seamed.

Next, an example and embodiment of the sealed can according to the present invention will be described based on the drawings from FIG. 2 onwards.

The notches 2 at the four corners of the can body plate 1 have different shapes for the lower end 5 and the upper end 7, and are approximately rectangular and approximately obliquely cut out as shown in FIGS. 3, 1 and 2.

Adhesive tape 6 is pasted to the bottom gob 5. Unlike applying an adhesive, attaching the adhesive tape 6 can employ an economical process that is significantly different from the manufacturing process.

The notch 2 of the upper gob 7 consists of a gently sloping side 71 and a steeply sloping side 72, and a contact point 73 between the two is provided.

The difference 75 between the contact point 73 and the upper edge 74 is designed according to the wall thickness of the can material.

The shape of the notch 2 itself can be designed in various ways, such as its degree of inclination or curve.

A seam bend line 3 and a seam bend line 4 are set on the can body plate 1.

The intersection point 34 of the seam bend line 3 and the seaming bend line 4 coincides with the angle of the rectangular notch 2 at the lower seam 5, and is set within the plane of the can body plate 1 at the upper seam 7.

In conventional cans, all four corners of the intersection 34 between the seam bend line 3 and the seam bend line 4 coincide with the corners of the notch 2, and are not within the plane of the can body plate. In this way, the seam bending line 3 and the seaming bending line 4 are formed,
By setting the intersection 34 within the plane of the can body plate 1 on at least one side of the seam, when folding the seam together, when folding the seam to the back side along the seam fold line 3 as shown by the arrow mark 12, the intersection Overlapping portions 13 are formed above and below 34 .

Intersection 34 and contact point 7, which is the outer upper surface of intersection 34
3 and the inclined side 72 become one surface 14 of the overlapping part and are bent.

Incidentally, since one surface 14 of the overlapping portion becomes a part that closes the vertical hole 9 as described later, it is a condition that the surface 14 has a minimum area that can close the opening of the vertical hole 9.

Fold the lower haze 5 and the upper haze 7 along the haze folding line 3, respectively, and fit the haze together.

The goby alignment can be done by matching the outer goby as shown in FIG. 1, 2 and 3, or by matching the inner goby, as shown in FIG. 2, 2 and 3.

However, in the present invention, internal alignment is more suitable than external alignment.

Since it is necessary to press fit into the recess of the chuck 11 and tighten it together with the end plate, there is a risk that the distance between the arrow marks 10 will increase, and it is difficult to press fit into the recess. This is because there is a force that presses horizontally one surface 14 of the overlapping portion that has blocked the vertical hole 9 and breaks the blockage.

As described above, there is a large difference in sealability, so the present invention employs internal seaming as shown in FIG. 2.

That is, the cans are assembled so that the cans are located inside the outer surface 15, and the combined cans are fitted into the recesses of the chuck 11 in advance, and the end plates are tightened.

This tightening method does not apply excessive force in the horizontal direction to the surface 14 that closes the upper and lower openings of the vertical hole 9, and the surface 14 is not distorted, so that sealing is highly guaranteed.

When the seams are joined together, the lower seam 5 and the upper seam 7 are airtightly joined via the adhesive tape 6.

The state of the joints is naturally different between the outside joints and the inside joints as shown in Fig. 1 3 and Fig. 2 3, but in particular in the present invention, one surface 14 of the overlapping part is exposed at the upper and lower ends. Therefore, the upper and lower ends are partially overlapped in 3 layers, and the halves are overlapped in 4 layers.

A flange 16 is formed on this cylindrical can body along the seaming bend line 4.

In the joint part, the flange 16 is connected to one side 14 of the overlapping part.
intervening, resulting in a partially triple flange.

Next, the end plate 20 is fitted onto the can body on which the flange has been formed, and the end plate 20 is tightened as described above so that the joint part fits into the recessed part of the chuck 11.

The upper and lower openings of the vertical hole 9 are closed by a part of one surface 14 of the overlapping part, and the tip of the one surface 14 is closed by the end plate 2.
Since it is tightly wound at zero, stable closure is possible.

Furthermore, since the adhesive tape 6 applied to the upper flange 16 covers the closed area, the sealing performance becomes even better.

In this way, in the present invention, the intersection point between the seam bend line and the seam bend line is set within the plane of the can body plate, rather than at the corner of the notch, to form the seam part and flange, so it is easier to fit the seam together. Since it can be closed and bent to cover the vertical holes in the end face that inevitably occur due to the thickness of the can material, it is possible to provide a sealed can with extremely high sealing guarantee.

In particular, the sealing performance is extremely excellent when the inner seals are pressed together.

The practical value is excellent.

[Brief explanation of drawings]

Figure 1 shows a conventional can. 1 is a front view of the can body plate, 2 is a partial cross-sectional view of the can with the outer joint fitted and fitted into the chuck, and 3 is a partial longitudinal sectional view of the can with the outer joint fitted. It is. Figure 2 and subsequent figures show an embodiment of the sealed can according to the present invention, in which Figure 2 1 is a front view of the can body plate, and Figure 2 is a partially cross-sectional view of the can fitted into the chuck with the inner joint. 3 is a partial longitudinal sectional view of the inner goby, Figure 3 1 is a partially enlarged view of the lower goby,
2 is a partially enlarged view of the upper seam, Figure 4 is a perspective view of the seam part with the seam joined and a flange formed, and Figure 5 is a part of the seam part with the end plate tightened. FIG. Brief explanation of the symbols, 1... Can body plate, 2... Notch, 3... Seam bend line, 4... Sealing bend line, 34...
...Intersection, 5...Lower gob, 7...Upper gob, 9...Vertical hole, 13...Overlapping part, 14...One side of the overlapping part.

Claims (1)

[Scope of utility model registration request] Among the four corners formed by the intersection of the seam bend line forming the seam part of the can body plate and the seam bend line forming the flange, the upper and lower corners of the lower seam part are the intersections of the seam seam bend line and the seam seam bend line. The upper and lower corners of the upper seam are cut out approximately diagonally, and the intersection of the seam bend line and the seam bend line is set within the plane of the can body plate. and forming a triangular overlapping part with the intersection as the apex above and below the intersection of the upper seam part folded along the seam fold line when joining the seam,
This overlapping part is continuous from the flange above and below the seaming bend line, and extends so as to overlap the upper and lower ends of the upper seam side of the flange when the seams are joined, and is designed to avoid the vertical hole that is created when the seams are joined. A sealed can in which the upper and lower openings are closed so as to be wrapped by an inner surface that is wider than the vertical hole opening and is on the upper end end side of the overlapping part that is folded along the seaming bend line when the end plates are seamed. .