JPH033467Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) This invention aims to generate elasticity and improve adhesion in the seamed parts of cans in which a partition plate is secured to the can body by seaming. This relates to sealed cans.

(Prior Art) Conventionally, in a can in which a partition plate is secured to a can body by seaming, the center of the seaming is hollow. For this reason, it was not possible to apply pressure to the seaming contact area between the can body and the partition plate during seaming, and it was difficult to apply pressure to the overlapping parts of the two, so we devised a new seaming structure. They took great pains to ensure the airtightness of the cans by adding molded parts to the cans and using molded partitions.

Therefore, in order to improve the adhesion between the can body and the partition plate, the applicant previously developed a can with a partition plate fixed to the can body by winding and fixing the partition plate. The present invention provides a can partition plate device in which the core material of the can is wrapped, and the can body edge of the seaming part and the peripheral edge of the partition plate are bonded under pressure (Utility Model Application No. 177331/1983).

(Problems to be Solved by the Invention) However, in such a structure, a core material is essential, and the seaming process becomes complicated.

(Means for Solving the Problems) However, in the present invention, since a plurality of overlapping folds are provided on the peripheral edge of the partition plate, it is possible to improve the pressurized adhesion between the can body and the partition plate. , the above-mentioned conventional problems were solved.

That is, the present invention provides a can in which a metallic can body rim and a peripheral edge of a middle partition plate are rolled and fixed to the inside of the can body, and the peripheral edge of the middle partition plate is rolled and fastened so that a plurality of peripheral edges of the middle partition plate are overlapped. It is a sealed can in which the can body edge in the seamed part and the peripheral edge of the partition plate are airtightly seamed and heat welded. Furthermore, the folding of multiple overlaps on the peripheral edge of the partition plate is 2
It is a heavy or triple-layered airtight can, and the partition plate is an airtight can in which a heat-welding layer is provided on one or both sides of a heat-welding resin thin plate, a synthetic resin thin plate, or a metal thin plate,
Moreover, the inner partition plate is an airtight can made of a laminate of multiple films.

(Function) This invention can achieve close contact between the can body and the partition plate without using a core material, which saves materials and simplifies the manufacturing process. By folding back the peripheral edge in the direction opposite to the direction of tightening, elasticity is created in the tightening portion.

(Example) This invention will be described below based on an example shown in the drawings.

The mouth edge of the metal can body 1 and the periphery of a polyethylene partition plate 2 having a folded portion 3 formed on the outside so that the periphery portions overlap in two layers are fixed by winding. The folded portion 3 is wrapped within the seamed portion. Further, the abutting portion between the can body 1 and the partition plate 2 by seaming is heat welded.

In order to obtain the sealed can shown in the above embodiment, a partition plate 2 having a bottomed cylindrical shape and having a folded part 3 on the outside of its rising wall 4 is attached to the can body 1 as shown in FIGS. 3 and 4. The can body 1 and the partition plate 2 are fitted into the mouth part.
The rising wall 4 and the folded part 3 are integrally pressurized inward as shown in FIG. 5 and seamed, and the heat chuck 7 having the heater 6 is brought into contact with the seamed part as shown in FIG. Apply pressure. The mouth edge of the can body 1 and the peripheral edge of the partition plate 2 are heated by the heat of the heater, and the abutting portions of the two are thermally welded under pressure as shown in FIG. Although the partition plate is provided with a score 5 for opening the can, it may be provided without this score.

In this example, the folded part of the partition plate was placed inside the seaming part, so the end of the partition plate was not exposed inside the can, and the contents, especially powder, would not adhere to the end of the partition plate. There is no fear.

In the above, the can body is made of metal, but the material is not limited as long as it can be used as a can.

In addition, since the partition plate 2 is made of polyethylene,
The inner surface of the can body 1 can be thermally welded without any treatment for thermal welding, but it is also possible to use a thin sheet of heat-fusible resin other than polyethylene as long as it has good affinity with metals. Further, even when the partition plate 2 is made of a thin synthetic resin plate or a thin metal plate that has poor affinity with metals, heat welding can be performed by providing a heat welding layer on one or both sides of these thin plates.
Further, the partition plate is not limited to the above-mentioned one, but can also be a laminate plate of a plurality of films.

Incidentally, the bonding between the can body 1 and the partition plate 2 is not limited to the thermal welding of the above embodiment, and an adhesive may also be used.

Further, the folding of the partition plate is not limited to the double fold as in the above embodiment, but if the fold is triple or more, a sealed can with high elasticity of the seamed portion can be obtained.

(Effect of the invention) That is, according to this invention, the peripheral edge of the inner partition plate is folded back so as to overlap in plurality at the seaming part of the metal can body and the partition plate, so that the can body and the inner partition are folded during the seaming process. Strong pressure can be applied to the contact area of the plate. In addition, since the peripheral edge of the partition plate is folded back in the opposite direction to the seaming direction, elasticity is generated in the seaming part, which improves airtightness and increases the mounting strength of the partition plate. There is an effect.

However, the contact area between the can body and the partition plate must be tightly tightened.
Since pressure welding or pressure bonding is performed, airtightness can be improved.

Furthermore, since the can body is tightly wrapped around the inside of the can body, no protrusion is formed on the outside of the can body, making it easier to handle when storing and moving the can. Furthermore, since no core material is used in the seaming portion, there is an effect of saving materials and simplifying the manufacturing process.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a partition plate according to an embodiment of this invention, Figs. 2 to 7 show the manufacturing process of an embodiment of this invention, and Fig. 2 shows a partition plate on a can body. Fig. 3 is a partially enlarged longitudinal sectional view with the seaming part welded under pressure;
The figure is a partially enlarged longitudinal cross-sectional view of the can body with the partition plate fitted into the can body, Figure 5 is a partially enlarged longitudinal cross-sectional view of the can body and the divider plate being tightened together, and Figure 6 is the same partially expanded longitudinal cross-sectional view of the can body and the partition plate fitted together. Fig. 7 is a partially enlarged vertical cross-sectional view of the tightening part being brought into contact and pressurized with a heat chuck, Fig. 7 is a partially enlarged longitudinal cross-sectional view of the seaming part being fixed by heating, and Fig. 8 is an enlarged cross-sectional view of the main part of the embodiment. be. 1... Can body, 2... Partition plate, 3... Folded part, 4
...Rising wall, 5...Score for can opening.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A can in which a metal can body mouth rim and a peripheral edge of a middle partition plate are wound and fixed to the inside of the can body, so that the peripheral edges of the middle partition plate are overlapped in plurality. The can body is folded back in a direction opposite to the seaming direction, and the can body edge within the seaming part and the peripheral edge of the partition plate are airtightly seamed and heat welded. 2 Folding of multiple overlaps on the peripheral edge of the partition plate is 2
Scope of multiple or triple utility model registration claims No. 1
Sealed can as described in section. 3. The sealed can according to claim 1, in which the partition plate is a thin heat-fusible resin plate, a thin synthetic resin plate, or a thin metal plate, with a heat-welding layer provided on one or both sides thereof. 4. The sealed can according to claim 1, wherein the partition plate is a laminated plate of a plurality of films.