JPH0329661B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a metal can body with a lid double-sealed to the upper and lower openings, or a paper can body with a lid sealed to the upper and lower openings. Can bodies of 3-piece cans, etc.
In particular, the present invention relates to an adhesive can body made of a single blank cylindrically molded and joined with an adhesive.

BACKGROUND ART Conventionally, adhesive can bodies have been formed by forming a blank into a cylindrical shape with four corners slightly cut diagonally, and polymerizing and bonding both ends of the blank with adhesive tape.

For this reason, in the case of double-sealing, the can body joint by adhesive is made of two body materials that are folded back as a body hook inside the lid seam structure, as shown in Figure 13. 21 and 2 on the chalk wall side
A cover member 22 is engaged with the body member 21, and a total of seven plates are folded in the horizontal direction of the cross section. As a result, in the seamed structure, a step equal to two plate thicknesses is created between the total plate thickness T of the so-called normal parts other than the joint part and the total plate thickness L·T of the joint part.

Problems to be Solved by the Invention In the conventional adhesive can, due to the step at the joint, an excessive impact load is applied to the joint when the seaming roll passes during the seaming process between the can body and the lid. In addition, there was a drawback that the adhesive on the can body was easily destroyed.
Another drawback was that the normal seaming part near the stepped part was loosely seamed. For this reason, a leakage path was created between the fractured portion of the joint and the seaming lace portion, thereby impairing the airtightness of the can body and creating a risk that the contents would leak.

The present invention has been devised in view of the above-mentioned circumstances, and provides a bonded can body that can prevent the adhesion of the can body from being destroyed at the seam part and improve the sealing ability of the seam part. The purpose is to provide

Means for Solving the Problems When there are very few or no steps at the joint, such as in welded cans or drawn cans, the above-mentioned leakage phenomenon at the seamed portion is almost non-existent. Therefore, the smaller the level difference in the joint, the less the seaming load applied to the joint, preventing breakage, and the less loose seaming of the normally seamed part in the vicinity of the level difference, improving the sealing performance. The present invention has been made with attention to this point.

The structure of the present invention for solving the above problems is as follows:
An explanation will be given based on drawings corresponding to embodiments.

The present invention relates to a can body of a three-piece can formed by overlapping and adhesively bonding both ends of a single blank 1, and the can body located within the seaming part or the sealing part when the lid body is seamed or sealed. The structure is characterized in that at least one joint edge of the body joint part is provided with a notch 4 at a part c where the body hook BH is folded over, leaving a part a which becomes the body hook.

In addition, if a notch 3 is further provided at the part of the other joining edge 2 located in the seaming part or the sealing part that becomes the body hook, when the lid is seamed or sealed,
The seaming or sealing thickness L·t of the winding barrel matching portion can be seamed or sealed to a thickness that is one can body material plate thicker than the thickness t of other normal seaming portions.

Function A notch 3 is provided at a location where the body hook is to be provided on one joining edge 2 located within the lid body wrapping portion or sealing portion of the blank 1, and a notch 4 is provided at the location where the body hook is folded on the other joining edge 2'. When the joint edges are joined with adhesive tape to form a can body, the joint part located at the seaming part or the sealing part has an asymmetrical cut part at the part where the body hook is to be formed and the part where the body hook is folded. (Figure 2).

When the lid is wrapped around the can body formed in this way, the seaming wall portion of the lid fits into the notch 3 provided at the location where the body hook is to be formed, and into the notch 4 provided at the location where the body hook is folded. The end hook portion 7 of the lid body is inserted (FIG. 5).

As a result, the seaming thickness of the joint part is only one board thicker than the seam thickness of other parts, and conventionally, the step between the joint seam part and the normal seam part was two board thicknesses. can be reduced to the thickness of one plate.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

1 to 5 relate to an adhesive can which is a first embodiment of the present invention. In the figure, 1 is a blank for forming a three-piece can body. When the blank 1 is formed into a can body and the lid is sealed,
In order to prevent the joint part of the barrier body from bulging at the seaming part, a notch 3 is made at the joint edge 2, 2' of the blank to be joined at the location where the can lid fastening part is located, as shown in FIG. , 4 are provided. The notch 3 provided in the joint edge 2, which becomes the inner overlapping part when formed into the can body, forms a body hook BH (Fig. 5) when the can lid is tightened from a position exceeding approximately 1/2 of the joint width w. vertically to a height of
The notch is sloped from this position to the edge position of the joining edge 2 which becomes the bent part 5 (FIG. 5) of the upper part of the body hook.

That is, the portion a (FIG. 2) that will become the body hook is cut out to a position approximately 1/2 or more of the joint width.
In addition, the notch 4 provided in the joint edge 2', which becomes the outer overlapping part,
A body hook corresponding to the size of the notch 3 is left, and a body hook is provided at a point c (Fig. 2) where the body hook overlaps, so that the body hook fits under the notch 3 when the body hook is folded back. .

After forming the notches 3 and 4 as described above, the joining edge 2,
Adhesive tapes 9, 9' are applied to 2' and formed into a can body, and the joining edges 2, 2' are joined via the adhesive tapes 9, 9'. As a result, as shown in FIG. 2, in the joint where the notches 3 and 4 are provided, the positions corresponding to the notches 3 and 4 of the part a that becomes the body hook and the part c where the body hook is folded are other joints. It becomes thinner by one board thickness. In addition, in the same figure,
b indicates the radius, and the shaded area indicates the adhesive portion.

When a lid is double-sealed to the can body formed in this manner by ordinary means, the seaming structure of the can body joint portion becomes as shown in FIGS. 4 and 5. The joint edge 2, which is on the inside of the joint, is cut out where the body hook will be, but the part where it overlaps is left; conversely, the joint edge 2', which is on the outside of the joint, is cut out where the body hook will be, but the part where it will overlap is left. Since there is a notch, when the lid is tightened, the lid material 6 will fit into the notch, and the thickness L・t of the entire joint will be the thickness of 6 sheets as shown in Fig. 4. The thickness is one sheet less than the plate thickness L and T of the conventional joint shown in FIG. Figures 5A and 5B show a BB sectional view and a CC sectional view of Figure 4. In Figure 5, the notch 4 of the joining edge 2' where the end hook portion 7 of the lid 6 overlaps with the outside is shown. In the figure, it can be seen that the seaming wall 8 of the lid 6 is fitted into the notch 3 of the joining edge 2 which overlaps inward.

6 to 10 show other embodiments of the present invention, in which the present invention is applied to a paper can that is used by sealing a paper lid to a paper body in the form of a general paper pot.

FIG. 6 is a plan view of a paper blank 10 for forming the body of the paper can. The blank 10
Similar to the blank 1 in the first embodiment, cutouts 13 and 14 are provided at the joint portions 11 and 12 at positions located at the lid seal portions. The notch 13,1
4 has the same shape as the notches 3 and 4 in the metal can, but in the case of this embodiment, the joint edge 11 located on the outside has a notch 13 at the location d that will become the body hook, and a notch 13 is provided on the inside. A notch 14 is provided in the located joint edge 12 at a location e where the body hooks are folded and overlapped. The blank 10 provided with the notches as described above is molded, and the joining edges 11 and 12 are bonded together to form a can body. FIG. 7 shows the bonded state of the lid seal position of the bonded portion.

By a well-known method, the paper can body formed as described above is
When the lid 15 is sealed, the sealing structure of the joint portion becomes as shown in FIGS. 9 and 10. As a result, as in the case of double-sealing metal cans, the plate thickness at the joint is one plate thinner than the joint seal structure for ordinary paper cans shown in Figures 15 and 16. There is.

Furthermore, FIGS. 11 and 12 show examples in which the bonding area of the joint inside the seaming structure of a metal can is increased.

In this embodiment, only a notch 20 is provided in the joint portion, which corresponds to the notch 4 in the outer joint edge 2' shown in FIG. 1 of the first embodiment, and no cutout is provided in the inner joint edge. Not yet. Therefore, the seaming structure of the joint where the lid is seamed is as shown in Fig. 12.
The area corresponding to the cross-sectional position of C-C in the figure is 7 plates thick, the area corresponding to the body B-B sectional position is 6 plates thick, and the area corresponding to the normal seaming part is 5 plates thick. In minutes, its thickness becomes step-like. In this embodiment, since no notch is provided on the inner joint edge, the first
Although there is an advantage that the adhesive strength is greater than that of the first embodiment, there is a disadvantage that a part of the joint is thicker by one plate than that of the first embodiment. However, compared to the conventional method, the area where the seaming thickness increases at the joint is small, so
The impact load applied to the joint when the seaming roll passes is correspondingly small.

Effects of the Invention Since the can body of the present invention is configured as described above, the seaming thickness or sealing thickness of the can body joint portion is
The thickness of the can body is one piece less than the conventional one, so
Accordingly, the level difference between the normal seaming or sealing portion and the seaming thickness or sealing portion of the can body joint portion is smaller than that of the conventional method. As a result, it is possible to prevent the adhesion from being destroyed due to excessive impact load being applied to the joint when the shimming roll passes during the seaming process.

Further, since there are few steps in the seaming portion, the seaming can be done evenly and tightly, and unlike the conventional method, there are no places where the seaming is defective. Therefore, it is possible to prevent the airtightness from breaking at the joint of the seamed portion, which was a problem with conventional adhesive cans, and to obtain a completely sealed adhesive can.

Furthermore, since the overlapping joint width of the can body joint portion corresponding to the seaming position is much smaller than that of conventional products, flange processing, neck-in processing, and bonding processing can be easily performed.

As described above, the can body of the present invention has various remarkable effects compared to conventional can bodies.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the present invention, with Figure 1 being a plan view of a blank, Figure 2 being a partial plan view of a can body joint, and Figure 3 showing a lid attached to a can body. Figure 4 is a sectional view taken along A-A in Figure 3, Figure 5 A is a sectional view taken along B-B in Figure 4, and Figure 4 is a partial front view of the tightened state.
-C sectional view and Figures 6 to 10 are examples in which the present invention is applied to a three-piece paper can, Figure 6 is a plan view of the blank, and Figure 7 is a partial plan view of the can body joint. ,
Figure 8 is a front view of the lid sealed to the can body, Figure 9 is a sectional view taken along line D-D in Figure 8, and Figure 10 A is the 9th section.
EE-E sectional view in the figure, B is the FF-F sectional view, 1st
1 and 12 show still other embodiments of the present invention,
Fig. 11 is a partial plan view of the can body joint, Fig. 12 is a cross-sectional view showing the seaming structure of the joint when the lid is seamed to the can body in Fig. 11, and Figs. 13 to 15 are 13 is a cross-sectional view of a double-sealed structure of a can body joint, FIG. 14 is a cross-sectional view taken along line GG in FIG. 13, and FIG. 15 is a paper can body joint. FIG. 16 is a sectional view taken along line H--H in FIG. 15. 1, 10: blank, 2, 2', 11, 12:
Joint edge, 3, 4, 13, 14, 20: Notch, 5:
Bent portion, 6, 15, 22: Lid material, 7: End hook portion, 8: Seaming wall.

Claims (1)

[Scope of Claims] 1. In the can body of a three-piece can formed by overlapping and adhesively bonding both ends of one blank, in the seaming part or sealing part when the lid body is seamed or sealed. A can body of a three-piece can, characterized in that at least one joint edge of the can body joints located therein is provided with a notch at a place where the body hooks are folded, leaving a place that becomes a body hook. 2. The can body of a three-piece can according to claim 1, wherein the other joint edge of the can body joint part is provided with a notch at a location that becomes a body hook.