JPH0610001B2 - How to attach a lid to a non-metal can body - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-metal cylindrical can body made of any one of paper, plastic, a paper-based composite material, and a plastic-based composite material. The method of attaching a metal lid having a recessed portion fitted into the opening of the cylindrical can body at the opening end of the.

2. Description of the Related Art Conventionally, its problems have been conventionally attached by a method shown in FIG. 6 to a metallic lid at the open end of a non-metallic cylindrical can body made of a composite material mainly composed of paper. That is, a flange (22) protruding outward is provided at the open end of the can body (21), and a flange (25) having a curl (24) is provided at the peripheral edge of the lid (23), so that the lid ( 23) is covered on the open end of the can body (21) and double-tightened by using the winding chuck (29) and the winding roll (30) to form the flange (22) of the can body (21). Flange (2) on lid (23)
5) The tip and the curl (24) are wound together and crushed to form the can body hook (26) and the can lid hook (27), and the both are bound to form the winding tightening portion (28). It is supposed to do. However, when forming the outwardly overhanging flange (22) at the open end of the can body (21), a force to extend it is applied to the can body (21), so that the flange (22) is cracked. It happened. Further, when the lid (23) is pressed by the chuck (29) during tightening, and the can body (21) is pushed up by the lifter, the flange (22) is deformed as shown by the chain line in FIG. The crack became bigger. Therefore, in the can in which the lid (23) is attached to the can body (21) by the conventional method, a slow leak may occur through the cracks and the sealing property may be impaired. Also, when carbonated drinks are put into the can, the drink may soak into the paper through the cracks, and the strength of the can body hook (26) may be weakened. Since the pressure was applied, the can body hook (26) might come off from the winding tightening portion (28). Further, the can having the lid (23) attached to the can body (21) by the conventional method has a canned portion (28) between the can body (21) and the lid (23) as shown in FIG. Since it protruded outside of the outer periphery of the body (21), the winding portions (28) of the plurality of cans were vertically overlapped with each other, which caused the following problems. That is, when the lower winding part (28) scratches the surface-printed part of the can body (21) of the can having the upper winding part (28) or strongly presses the can body (21). , As shown by the alternate long and short dash line in FIG.
It even breaks 1). When the winding tightening portion (28) pushes up the upper winding tightening portion (28) due to impact, the winding tightening portion (28) is deformed and loosens as shown by the two-dot chain line in the figure, and the seal Sex is impaired. In particular, when a carbonated drink is placed in the can, the inside is in a pressurized state, so if the winding tightening portion (28) is deformed, the winding tightening may be disengaged.

By the way, as a method for attaching a lid to a metal can body, a method that solves the above problem is known (for example, see Japanese Utility Model Laid-Open No. 51-111459). In this method, a dent is formed inward in the radial direction in advance at the end of the can body, and the lid is placed with respect to the can body so that the tip of the curl at the end of the flange of the lid is located inside the dent. Then, the winding tightening is performed by using the winding chuck and the winding roll. In this method, a dent inward in the radial direction is formed in the can body,
Moreover, since the can body is made of metal, it is possible to prevent the occurrence of cracks in the dent. Also, in the case of a can manufactured by this method, the outer circumference of the winding part of the can body and the lid is concentric with the outer circumference of the can body and is located on substantially the same circle. The occurrence of problems caused by the mutual overlap is prevented. However, when this method is applied to the attachment of a lid to a non-metal can made of any one of paper, plastic, a paper-based composite material and a plastic-based composite material, There is such a problem. That is, even if the dent is formed in advance,
The original shape is restored due to the change with time due to the characteristics of the material, and defective winding occurs and leakage occurs at the winding portion.

An object of the present invention is to provide a method for attaching a lid to a non-metallic can body that solves the above problems.

MEANS FOR SOLVING THE PROBLEMS The method for attaching a lid to a non-metallic can body according to the present invention is made from any one of paper, plastic, a composite material mainly containing paper and a composite material mainly containing plastic. At the open end of the non-metallic cylindrical can body, when installing a metal lid with a recess that fits inside the opening of the cylindrical can body, set the outer diameter of the recess of the lid to be smaller than the inner diameter of the opening of the can body. None, a flange having a curl is provided on the periphery of the lid, first and second winding rolls and a chuck are prepared, and the first winding roll is placed below the winding groove until the first winding is completed. Use the one with a processing flange that contacts the body and indents the can body inward in the radial direction.First, cover the opening end of the can body with the lid so that the recess enters the opening of the can body. At the same time, align the centers of both and fit the chuck into the recess, By bringing the first winding roll closer to the chuck in this state, the processing flange of the first winding roll is brought into contact with the can body, and the can body is rotated in the radial direction over the entire circumference by rotation of the first winding roll and the chuck. The first winding is tightened so that it is indented and pressure is applied to the flange of the lid so that the flange is wound into the recess, and then the second winding roll is brought closer to the chuck and the second winding roll and the chuck are closed. By the rotation, the second winding roll and the chuck completely wind up the portion near the opening end of the can body and the flange of the lid to crush and crush the second winding to form a winding portion. The outer circumference of the can is concentric with the outer circumference of the can body and is present on the substantially same circle or inside thereof.

In the above, as the paper cylinder can body, one made of strong single-layer thick paper, one made of two or more layers of thick paper, and one obtained by sticking fine paper having a print on the outer surface thereof is used. To be As the plastic cylindrical can body, one made of a single layer plastic and one made of two or more layers of plastic are used. As a cylindrical can body made of a composite material mainly composed of paper, generally, a strong cardboard is used as a core layer, a synthetic resin coated paper such as polyethylene, an aluminum (including aluminum alloy) foil, etc. is used as an inner layer for printing. The high-quality paper that has been treated, the same aluminum foil, the laminated product of plastic film and paper, etc. as the outer layer, and the inner or inner and outer surfaces of cardboard coated with a synthetic resin layer are used. Not limited to. As the cylindrical can body made of a composite material mainly made of plastic, for example, one having a strong plastic layer whose inner surface is covered with an aluminum layer and whose inner surface is further covered with a synthetic resin layer is used. Not done. The aluminum layer is formed by laminating an aluminum foil on the plastic layer or depositing aluminum on the plastic layer. In the above, as the strong plastic in the plastic cylindrical can body and the plastic in the composite material mainly made of plastic, for example, those made of polyolefin synthetic thermoplastic resin such as polypropylene, polyethylene and polyethylene terephthalate are used.
In the case of the plastic cylindrical can body and the composite material cylindrical can body mainly made of plastic, if the portion near the opening end during winding is heated, processing becomes easy. The material of the cylindrical can body is appropriately determined in consideration of the property of a material to be put in a non-metal can having a lid attached to the open end of the can body. As the metal lid, a non-treated one, a rustproofed inner surface, a plastic film laminated inner surface, and the like are used. The outer surface is appropriately treated in consideration of the use of the can. Moreover, it is preferable to apply a sealing compound or an adhesive agent to the flanges of these lids, if necessary.

The method of the present invention is applied to a case where a lid having a recessed portion fitted in the opening is attached to one end or both ends of a cylindrical can body having both ends opened. In the former case, the opening at the other end is
It is closed by an appropriate known method. Further, when a cylindrical can body is made of plastic or a composite material mainly made of plastic, a bottomed cylindrical can body having one end closed and the other end open can be provided, but it goes without saying that such a can is used. The method of the present invention can be applied to the case where the lid is attached to the open end of the case.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 5.

FIG. 5 shows a non-metallic can having a lid attached to the open end of the can body by the method of the present invention. This non-metal can (1)
A cylindrical can body (2) made of paper and having both ends open, and a cylindrical can body (2) having recesses (3) fitted in openings at both ends of the can body (2) and attached to both ends of the can body (2). Top lid (4) and bottom lid (not shown) for closing the opening by
The outer diameter of the recess (3) of each lid (4) is smaller than the inner diameter of the can body (2), and the can body (2) and the lid (4)
The outer circumference of the winding tightening portion (5) is concentric with the outer circumference of the can body (2) and exists on the same circle. The can body hook (6) and the can lid hook (7) in the winding part (5).
And are formed and bound to each other.

In the above, the non-metallic can (1) is manufactured by attaching the lids (4) to both ends of the can body (2) by the double winding method. When the lids (4) can be attached to both ends of the can body (2), no processing is performed on the can body (2) as shown in FIG. A flange (10) having a curl (9) whose tip faces the peripheral wall (8) of the recessed portion (3) is provided on the peripheral edge. Flange (10) on lid (4)
Apply a sealing compound (not shown) to the required positions on the back surface.

Then, one lid (4) is placed over the upper end of the can body (2) so that the recessed portion (3) fits into the upper end opening of the can body (2), and the centers of both are aligned. At this time, there is a gap between the peripheral wall (8) of the recess (3) and the can body (2). It is preferable that the width (X) of the gap and the wall thickness (Y) of the can body have a relationship represented by the formula 0.5Y ≦ X ≦ 2.5Y. The can body (2) is mounted on a lifter (not shown). In this state, close the winding chuck (11) with the lid (4).
Into the concave portion (3), and the bottom surface thereof is brought into close contact with the bottom wall of the concave portion (3) and the peripheral surface thereof is brought into close contact with the peripheral wall (8) of the concave portion (3). The outer diameter of the winding effective portion (16) of the flange wall facing the winding grooves (14) and (15) of the first and second winding rolls (12) and (13) on the outer peripheral surface of the chuck (11). Is equal to the outer diameter of the can body (2) minus the length of twice the winding thickness (T) of the winding portion (5). Further, below the winding groove (14) of the first winding roll (12), the can body (2) is abutted against the can body (2) by the inner side in the radial direction until the first winding is completed. Processed flange (1
7) is provided. Then, while rotating the chuck (11) and the first winding roll (12), the chuck is rotated.
When moved to (11), first the flange (10) of the lid (4)
And for processing the first winding roll (12) before the tip of the curl (9) hits the can body (2) after the curl (9) hits the inner surface of the groove (14) and is deformed so as to be rolled up. The flange (17) contacts the can body (2), and the can body (2) is dented radially inward over the entire circumference (see FIG. 2). When the first winding roll (12) is further brought closer to the chuck (11), the can body (2) is pushed inward by the processing flange (17) and pushed upward by the lifter. The portion near the upper end of 2) is bent inward in a substantially U-shaped cross section to form a dent (18) over the entire circumference. The inner end of the dent (18) having a substantially U-shaped cross section in the can body (2), that is, the part closer to the upper end than the part where the processing flange (17) first abuts, is the can body hook forming part (19). (See FIG. 3). Furthermore, the first winding roll (12) is brought closer to the chuck (11) and the tip of the flange (10) of the lid (4) and the curl (9) are indented (18), that is, below the can body hook forming portion (19). It is wound up and the first winding tightening is completed (see FIG. 4). continue,
The can body hook forming portion (19) of the can body (2) wound by the first winding roll (12) is brought closer to the rotating chuck (11) while rotating the second winding roll (13). ) And the tip of the flange (10) of the lid (4) and the curl (9) are attached to the second winding roll (1
The second winding is performed by compressing and filling between the winding groove (15) of 3) and the winding effective working portion (16) of the flange wall of the chuck (11), and the can body hook (6) and The can body hook (7) is formed and the two are bound together to form the winding portion (5). At this time, the flange below the winding groove (15) of the second winding roll (13) is in contact with the can body (2) (see FIG. 5). Next, the can body (2) is placed upside down on the lifter, another lid is put on the other end of the can body (2), and the same tightening as described above is performed. The outer circumference is positioned concentrically with the outer circumference of the can body (2) on the same circle.

In the above-mentioned embodiment, the end of the can body (2) before the first winding is not straightened without any processing, but the present invention is not limited to this, and the can is previously formed. The open end of the body (2) may be bent slightly outward. In this case, the bending amount is such that the material does not crack even if the material is stretched due to the outward projection.
In the above embodiment, the flange below the winding groove (15) of the second winding roll (13) is in contact with the can body (2) during the second winding, but the invention is not limited to this. However, the flange below the winding groove (15) of the second winding roll (13) does not necessarily contact the can body (2).

EFFECT OF THE INVENTION According to the method of attaching a lid to a non-metallic can body according to the present invention,
As the winding roll, a roll provided with a processing flange below the winding groove that contacts the can body and indents the can body radially inward by the end of the first winding is used. The processing flange of the tightening roll is brought into contact with the can body, and by rotating the first winding roll and the chuck, the can body is dented radially inward over the entire circumference and pressure is applied to the lid flange to dent the flange. Since the first winding tightening is performed so as to be wound inside, there is no possibility that the can body is restored to its original shape and the dent disappears due to the change over time due to the characteristics of the material, as in the case where the dent is formed beforehand. Therefore, the winding is reliably performed, and the occurrence of leakage or the like at the winding portion can be prevented. Also, since a dent is formed inwardly in the can body, cracks occur at the part that will become the can body hook in the can body, as in the case of forming a flange that extends outward in the conventional radial direction. Is prevented. Therefore, various harmful effects resulting from the generation of the cracks can be eliminated. Further, following the first winding, the second winding roll is moved closer to the chuck, and the second winding roll and the chuck are rotated so that the portion of the second winding roll and the chuck near the opening end of the can body and the flange of the lid. The second winding is performed so as to completely wrap and squeeze and form a winding portion, and the outer circumference of the winding portion is concentric with the outer circumference of the can body and is located substantially on the same circle or inside thereof. Therefore, in the non-metal can in which the lid is attached to the can body by the method of the present invention, it is possible to eliminate various adverse effects resulting from the upper and lower overlapping of the winding fastening portions.

[Brief description of drawings]

1 to 4 are partial cutaway front views showing the sequence of the method in order, and FIG. 5 is a partial cutaway front view showing the final stage of the method of the present invention. FIG. 6 is a partially cutaway front view showing a part of the conventional method, and FIG. 7 is a partial cutaway of two non-metallic cans showing a problem of a non-metallic can whose lid is attached to a can body by the conventional method. FIG. (2) …… Cylinder can made of non-metal, (3) …… Concave part,
(4) …… Metal lid, (5) …… Winding tightening part, (9) …… Curl, (10) …… Flange, (11) …… Winding tightening chuck, (12)
…… 1st winding roll, (13) …… 2nd winding roll, (14)…
… Winding groove of the 1st winding roll, (17) …… Processing flange,
(18) …… Dent.

Claims (1)

[Claims] 1. A non-metallic cylindrical can body made of any one of paper, plastic, a paper-based composite material, and a plastic-based composite material. When attaching a metal lid having a recessed portion to be fitted in, the outer diameter of the recessed portion of the lid is set smaller than the inner diameter of the opening of the can body, and a flange having a curl is provided on the peripheral edge of the lid. Prepare a winding roll and a chuck,
As the first winding roll, a roll provided with a processing flange below the winding groove, which is in contact with the can body and dents the can body radially inward by the end of the first winding, First, the lid
By covering the opening end of the can body so that the recess enters the opening of the can body, aligning the centers of both, and fitting the chuck into the recess, and in this state, bringing the first winding roll close to the chuck, The processing flange of the first winding roll is brought into contact with the can body, and the first winding roll and the chuck rotate to indent the can body radially inward over the entire circumference and apply pressure to the flange of the lid. The first winding is tightened so as to be wound in the dent, and then the second winding roll is moved closer to the chuck and the second winding roll and the chuck are rotated, so that the opening end of the can body is opened by the second winding roll and the chuck. The second part is tightened so that the side part and the flange of the lid are completely wound and crushed to form a winding part, and the outer periphery of the winding part is concentric with the outer periphery of the can body on the same circle or on the same circle. Yo Lid attachment method to non-metallic can body, characterized in that made present inwardly.