JPS6278047A - Can and manufacture thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a cylindrical can body made of any one of paper, plastic, a composite material mainly composed of paper, and a composite material mainly composed of plastic; a metal lid attached to at least one end of the body;
This invention relates to cans used to hold cake batter, snack foods, etc., and a method for manufacturing the same.

PRIOR ART AND THEIR PROBLEMS Conventionally, for example, a can consisting of a cylindrical can body made of a composite material mainly made of paper, and a metal top and bottom lid with recesses, and for storing bread dough, etc. As shown in the figure, the can body (22) is connected to the peripheral wall (22) of the recessed part (21) of the lid (20) and the peripheral wall (22) of the recessed part (21).
3) Inwardly folded clamping wall (24) clamping the peripheral wall of
is provided, and the outer periphery of the clamping wall (24) projects outward from the outer periphery of the can body (23). The reason why bread dough is put into such a can is that this can has two holes on both ends of the can body.
The sealing performance is inferior to cans with metal lids attached by heavy seaming, and this is because gas generated by yeast added to the dough can escape from between the can body and the lid. However, in the case of conventional cans, the sandwiching walls (24) of a plurality of cans overlap vertically, causing the following problems. That is, the lower clamping wall (24) has a can body (
If the printed surface of Can II (23) is scratched or the Can II (23) is pressed too hard, it may create a dent in the can body (23) or even break the can body (23). In addition, when the clamping wall (24) pushes up the upper clamping wall (24) due to an impact, the peripheral wall of the can body (23)
20), the peripheral wall (22) of the concave portion (21) and the sandwiching wall (24)
) may fall out from between

An object of the present invention is to provide a can and a method for manufacturing the can that solves the above problems.

Means for Solving the Problems One can of the present invention includes a cylindrical can body made of any one of paper, plastic, a paper-based composite material, and a plastic-based composite material; a metal lid attached to at least one end of the can body, a reduced diameter portion is provided at the end of the can body where the lid is to be attached, and the lid is provided with a recessed portion that is tightly fitted into the reduced diameter portion of the can body. An inwardly folded clamping wall is provided which is connected to the circumferential wall of the concave part and clamps the circumferential wall of the reduced diameter part of the can body together with the circumferential wall of the concave part, and the outer periphery of the clamping wall is concentric with the outer periphery of the can body. They are located on almost the same circle or inward from it.

Another method of manufacturing a can according to the present invention includes a cylindrical can body made of one of paper, plastic, a composite material mainly composed of paper, and a composite material mainly composed of plastic; When manufacturing a can consisting of a metal lid that is fitted into the can body and is attached to at least one end of the can body, the outside diameter of the lid recess is smaller than the inside diameter of the can body, and the lid A flange having a substantially hook-shaped cross section with the tip facing the peripheral wall of the concave portion is provided on the periphery, and a chuck that is fitted into the concave portion and a processing roll having an annular clamping wall forming groove extending all around the circumferential surface are prepared. First, place the lid over the open end of the can body so that the concave part enters the opening of the can body, and fit the chuck into the concave part to align the center of both.
In this state, by rotating the can body around its axis and bringing the processing roll close to the chuck, the 7 lunges of the lid are deformed so that they are bent toward the bottom wall of the recess and their tips are folded inward. forming an inwardly folded clamping wall over the entire circumference, clamping the end of the can body between the clamping wall and the circumferential wall of the concave part, and eliminating the gap between the concave part of the lid and the can body;
It is characterized in that the outer periphery of the clamping wall is concentric with and approximately on the same circle as the outer periphery of the can body, or is located inward from the outer periphery of the can body.

In the above, the paper cylindrical can body is made of strong single-layer cardboard, two or more layers of cardboard, or the outer surface of these is laminated with printed high-quality paper. It will be done. As the plastic cylindrical can body, one made of a single layer of plastic, one made of two or more layers of plastic, etc. are used. Cylindrical can bodies made of composite materials, mainly made of paper, generally have a core layer of strong cardboard, an inner layer of synthetic resin-coated paper such as polyethylene, aluminum foil (including aluminum alloys, the same shall apply hereinafter), etc., and printing. Materials used include high-quality paper treated with aluminum foil, materials with an outer layer made of a laminate of plastic film and paper, and materials whose inner or outer surfaces of cardboard are coated with a synthetic resin layer. but not limited to. A cylindrical can body made of a composite material mainly made of plastic is, for example, one in which the inner surface of a strong plastic layer is covered with an aluminum layer, and the inner surface is further covered with a synthetic resin layer, but this is limited to such a case. Not done. The aluminum layer is formed by bonding aluminum foil to the plastic layer or depositing aluminum on the plastic layer. In the above, the strong plastic in the plastic cylindrical can body and the plastic in the plastic-based composite material include, for example, polyolefin thermoplastic synthetic resins such as polypropylene, polyethylene, and polyethylene terephthalate. In the case of a cylindrical can body made of plastic or a cylindrical can body made of a composite material mainly made of plastic, processing becomes easier if the portion near the open end to which the lid is attached is heated.

The material of the cylindrical can body is determined as appropriate, taking into consideration the nature of the object to be placed in the nonmetallic can, which has a lid attached to at least one end of the can body. The metal lid used may be untreated, one with anti-corrosion treatment on the inner surface, or one with a plastic film laminated on the inner surface. As for the outer surface, appropriate treatments are carried out taking into consideration the intended use of the mortar. Further, sealing compound, adhesive, or the like may be applied to the flanges of these lids as necessary.

The method of the present invention is applied to the case where a lid having a recess that is fitted into the opening is attached to one or both ends of a cylindrical can body which is open at both ends.

In the former case, the opening at the other end is closed by a known appropriate method. In addition, when making a cylindrical can body from plastic or a composite material mainly made of plastic, it is also possible to make a cylindrical can body with a bottom that is closed at one end and open at the other end; The method of the present invention can also be applied when attaching a lid to the open end of the barrel.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 4.

FIG. 1 shows one can of the invention. This can consists of a cylindrical can body (1) made of a composite material mainly made of paper, and metal top lids (2) and bottom lids (as shown) attached to both ends of the can body (1). A reduced diameter portion (3) is provided at both ends of the can body (1). The top lid (2) and the bottom lid are the can body (1)
It has a recessed part (4) that is tightly fitted into the reduced diameter part (3). The circumferential wall (5) of the concave part (4) is connected to the opening side (upper side in Figure 1) end of the concave part (4) and the reduced diameter part of the can WA (1) together with the peripheral wall (5) of the concave part (4). An inwardly folded clamping wall (7) is provided which clamps the peripheral wall of can +11 (3), and the outer periphery of the clamping wall (7) is concentric with the outer periphery of can +11 (1) and is approximately the same and circular. It is forced to exist.

To remove the lid (2) from such a can, forcefully push inward the connecting part (8) between the reduced diameter part (3) and other parts of the can body (1), and then lift the lid (2) upward. Or just pull it downward.

In manufacturing the above colors, as shown in Figures 2 to 4, the can body (1) is not subjected to any processing, and the top cover (2) and the concave portion (4) of the bottom cover are The periphery is provided with a flange (10) having a curl (9) whose tip is directed toward the peripheral wall (5) of the concave portion (4). The outer diameter of the concave portion (4) is made smaller than the inner diameter of the can body (1).

Then, attach the can II (1) with a lid that can be moved up and down (as shown).
Place one lid (2) on top of can 1, and place one lid (2) so that its recessed part (4)
11 (1) so that it fits into the top opening of the can body (1).
Place it over the top of the , and align the centers of both. In this state, raise the lifter and insert the chuck (11) into the concave part (2) of the lid (2).
4) Insert the bottom surface into the bottom wall (6) of the recessed part (4).
and the peripheral wall (5) of the concave portion (4).
Closely contact. As the chuck (11), a chuck used for attaching a lid to a can body by double seaming may be used.

Thereafter, while the can 11 (1) is pressurized from above and below by the chuck (11) and the lifter, the chuck and the lifter are rotated to rotate the can WA (1) around its axis. ) towards the chuck (11). On the surface of the first processing roll (12), a lid (2
) is provided with an annular clamping wall forming groove (13) over the entire circumference for preliminarily deforming the flange (10) (see FIG. 2). Then, the flange (10) of the lid (2) is wound around Its (13) of the first processing roll (12), and the outer half of the flange (10) is bent downward, and the tip thereof is bent inside and upward. Fold it back and bring its tip into contact with the lower surface of the flange (10). At this time, the flange (1) below the groove (13) of the first processing roll (12)
4) comes into contact with the can body (1). Then, the can WA (1) is pushed inward by the flange (14) and pressurized from above and below by the chuck (11) and lifter, so that the upper end of the can IH (1) is bent inward. (See Figure 3). Subsequently, the second processing roll (15) is brought closer to the chuck (11). Second processing roll (15
) is provided with a clamping wall forming groove (16) for completely deforming the flange (10) that has been preliminarily deformed by the first processing roll (12) to form an inwardly folded clamping wall (7). ) are provided all around.

By bringing the second processing roll (16) close to the chuck (11), the outside half of the flange (1C) of the lid (2) is connected to the i (16) of the second processing roll (15) and the outer circumference of the chuck (11). A finishing process is performed by compressing and filling between the surfaces to form an inwardly folded clamping wall (7), and the clamping wall (7) and the peripheral wall (5) of the concave portion (4) form a can body ( 1)
The surrounding wall (5) of the concave portion (4) is strongly pinched and the surrounding wall (5
) and the can body (1) to form a reduced diameter part (3). Then, attach the outer periphery of the clamping wall (7) to the can II! (1)
be located on the same circle and concentric with the outer periphery of the At this time,
The peripheral wall of the reduced diameter portion (3) is crushed in the thickness direction. As the first and second processing rolls (12) and (15), the first and second seaming rolls used when attaching the lid to the can body by double seaming may be used. Next, the can body (1) is placed upside down on the lifter, another lid is placed over the narrow end of the can body (1), and the same processing as described above is carried out, and the outer periphery of the clamping wall (7) is are located concentrically and approximately on the same circle with the outer periphery of the can body (1).

In the above embodiments, the attachment of the lid to the can body is carried out using two processing rolls, but the attachment is not limited to this, and may be carried out using one processing roll or three processing rolls. The above may also be used.

Effects of the Invention One can of this invention is configured as described above,
The outer periphery of the inwardly folded clamping wall that clamps the circumferential wall of the concave portion of the lid and the circumferential wall of the reduced diameter portion of the can body is concentric with the outer periphery of the can body and is approximately on the same circle, or is located inward from it. Because of this, the clamping portions of a plurality of cans do not overlap vertically as in the conventional case, and various problems caused by vertical overlapping can be eliminated.

Another method of manufacturing a can according to the present invention is to make the outer diameter of the concave portion of the lid smaller than the inner diameter of the can body, as described above, and to
A flange having a substantially hook-shaped cross section with a tip facing the peripheral wall of the concave portion is provided on the periphery of the lid, a chuck that is fitted into the concave portion, and a processing roll having an annular clamping wall forming groove extending all the way around the circumferential surface. First, place the lid over the open end of the can body so that the concave part enters the opening of the can body, fit the chuck into the concave part, align the centers of both, and in this state align the can body with its axis. By bringing the processing roll close to the chuck while rotating it around the center, the flange of the lid is bent toward the bottom wall of the recess and its tip is bent inward to form an inwardly folded clamping wall. The edge of the can body is sandwiched between this clamping wall and the circumferential wall of the recessed part, and the gap between the recessed part of the lid and the can body is eliminated, and the outer periphery of the clamping wall is connected to the outer periphery of the can body. Since it is characterized by being concentric with and existing on almost the same circle or inwardly from it, it is possible to easily obtain a can that does not have the problem of overlapping of the inner folded clamping walls as described above. can.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of one can of the invention - a partially cut away front view, and FIGS. 2 and 3 show another can of the invention! A partial vertical sectional view showing the progress of manufacturing,
FIG. 4 is a partial vertical cross-sectional view showing the final stage, and FIG. 5 is a partial vertical cross-sectional view of two conventional products showing the problems of the conventional products. (1)...Cylindrical can body made of composite material, (2)...Metal lid, (3)...Reduced diameter portion of can body, (4)...Concave portion of lid, (5) ... Peripheral wall of the recess, (6) ... Bottom wall of the recess, (7) ... Inward folded clamping wall, (10) ...
Lid flange, (11)... Chuck, (12) (1
5) Processing roll, (13H16) Sandwiching wall forming groove. Figure 1: 4 other people

Claims (2)

[Claims] (1) A cylindrical can body made of one of paper, plastic, a paper-based composite material, and a plastic-based composite material, and a metal lid attached to at least one end of the can body. , a reduced diameter part is provided at the end of the can body where the lid is to be attached, and the lid is provided with a recessed part that is tightly fitted into the reduced diameter part of the can body, and the lid is connected to the peripheral wall of the recessed part and is connected to the peripheral wall of the recessed part. An inwardly folded clamping wall is provided that clamps the circumferential wall of the reduced diameter part of the can body, and the outer periphery of the clamping wall is concentric with the outer periphery of the can body and exists on approximately the same circle or inwardly from it. A can that is forced. (2) It has a cylindrical can body made of one of paper, plastic, a composite material mainly composed of paper, and a composite material mainly composed of plastic, and a recessed part that is fitted into the opening of the can body. When manufacturing a can consisting of a metal lid attached to at least one end of the can body, the outer diameter of the recessed part of the lid is smaller than the inner diameter of the can body, and the tip is placed on the periphery of the lid so that the tip faces the peripheral wall of the recessed part. A chuck is provided with a flange having a substantially hook-shaped cross section and is fitted into the recess, and a processing roll having an annular clamping wall forming groove extending all around the circumference is prepared.
First, place the lid over the open end of the can body so that the concave part enters the opening of the can body, fit the chuck into the concave part, align the centers of both, and in this state rotate the can body around its axis. By bringing the processing roll close to the chuck while moving the roll, the flange of the lid is deformed so that it is bent toward the bottom wall of the recess and its tip is folded back inward, forming an inward folded clamping wall around the entire circumference. The end of the can body is clamped between this clamping wall and the circumferential wall of the recessed part, and there is no gap between the recessed part of the lid and the can body, and the outer periphery of the clamping wall is approximately concentric with the outer periphery of the can body. A method for manufacturing cans, characterized in that the cans are made to exist on the same circle or inwardly from the same circle.