JPS624009A - Method of mounting cover to can drum made of nonmetal - 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 paper, plastic, and composite materials mainly composed of either paper or plastic.
The present invention relates to a method for attaching a metal lid to the open end of a non-metallic cylindrical can body made of seeds, the lid having a recess that is fitted into the opening of the cylindrical can body.

Prior Art and its Problems Conventionally, a metal lid has been attached to the open end of a non-metallic cylindrical can body made of a composite material mainly composed of paper, for example, by a method as shown in FIG. That is, the can body (21)
A flange (22) protruding outward is provided at the open end of the can body, and a flange (25) having a curl (24) is provided at the periphery of the lid (23), and the lid (23) is attached to the can body (
21) and double-sealed using the seaming chuck (29) and seaming roll (30) to seal the can Jl.
(21) flange (22) and lid (23) flange (
25) Wrap the tip and gourd (24) together so that they are crushed, and connect the can body hook (26) and can lid hook (
27) and join them together to form the seaming part (
28). However, Can II
i! The flange (22) protrudes outward at the open end of (21).
), a force was applied to the can Jl (21) to stretch it, which sometimes caused cracks in the flange (22). Furthermore, after holding down the lid (23) with the chuck during seaming, when the can II (21) is pushed up with the lifter, the flange (22) appears as shown by the chain line in Figure 6.
was deformed and the above crack became larger. therefore,
In cans in which the lid (23) is attached to the can body (21) by the conventional method, slow leakage occurs through the cracks, and the sealing performance is sometimes impaired. Furthermore, when a carbonated beverage is placed inside a can, the beverage may seep into the paper through the above-mentioned cracks, weakening the strength of the hook part of the can body, and the inside of the can may become pressurized due to vibration during transportation. Therefore, there was a risk that the can body hook (26) would come off from the seaming part (28). Furthermore, as shown in FIG. 7, in cans manufactured by the conventional method, the seaming part (28) between the can body (21) and the lid (23) protrudes outward beyond the outer periphery of the can body (21). And that's why there are multiple cans.

The seaming portions (28) overlap each other vertically, causing the following problems. That is, the can body (
If the printed surface of the can body (21) is scratched or if the can body (21) is strongly pressed, it may cause a dent as shown by the dashed line in the same figure, or even cause damage to the can body (21). 21) may even break. Also, the seaming part (
28) pushes up the upper seaming portion (28), the seaming portion (28) is deformed and loosened, as shown by the two-dot chain line in the figure, and the sealing performance is impaired. In particular, if a carbonated beverage is placed inside the can, the interior will be under pressure, so if the seam portion (28) is deformed, there is a risk that the seam may come undone.

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-mentioned problems.

Means for Solving the Problems The method for manufacturing a non-metallic can according to the present invention provides a non-metallic cylindrical can made of one of paper, plastic, and a composite material mainly composed of either paper or plastic. When attaching a metal lid to the open end of the body, which has a recess that fits into the opening of the cylindrical can body, the outer diameter of the recess in the lid is smaller than the inner diameter of the opening of the can body, and A flange having a curl is provided, and first and second seaming rolls and a chuck are provided, and the first seaming roll is placed below the seaming groove and contacts the can body before the first seaming is completed. Using a lid equipped with a processing flange that recesses the body inward, first place the lid over the open end of the can body so that the concave part enters the opening of the can body, align the centers of both, and then chuck the lid. is inserted into the concave part, and in this state, by bringing the first seaming roll close to the chuck, the flange is brought into contact with the can body and the can body is dented inward around the entire circumference, and pressure is applied to the lid flange. The first roll is tightened so that the flange is rolled into the recess, and then the second roll is moved closer to the chuck so that the part of the can body near the opening end and the flange of the lid are completely rolled up with both rolls. A second seam tightening is performed to crush the can body to form a seam part, and the outer periphery of the seam part is concentric with the outer periphery of the can body and is located on approximately the same circle or inward from it. It is.

In the above, the paper cylindrical can body may be made of strong single-layer cardboard, two or more layers of cardboard, or the outer surface of these cans may be laminated with printed high-quality paper. It will be done. As the plastic cylindrical can body, one made of a single layer of plastic and one made of two or more layers of plastic 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 laminating aluminum foil onto the plastic layer or depositing aluminum onto 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 opening end is heated during seaming.

The material of the cylindrical can body is determined as appropriate, taking into consideration the nature of the objects to be placed in the nonmetallic can, which has a lid attached to the open end of the can body. The metal lid used may be untreated, laminated with anti-rust treatment on the inner surface, or coated with a plastic film on the inner surface. Appropriate treatments are applied to the outer surface, taking into account the intended use of the color.

It is also advisable to apply sealing powder or adhesive 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. Furthermore, when making a cylindrical can body from plastic or a composite material mainly made of plastic, it is also possible to make a bottomed cylindrical can body with one end closed and the other end open. The method of the present invention can also be applied when attaching a lid to the open end of a can body.

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

FIG. 5 shows a non-metallic can with a lid attached to the open end of the can body by the method of the invention. This non-metallic can (1) is
Composite cylindrical can body (2
), and a recessed part (
3) and a metal top lid (4) and bottom lid (as shown) attached to both ends of the can body (2) to close the opening, and a recessed portion (3) of the can lid (4). The outer diameter of can WA (2
) is smaller than the inner diameter of can III (2) and lid (4)
The outer periphery of the seaming part (5) is concentric with the outer periphery of the can body (2) and is arranged on the same circle. Sealing part (5
), a can body hook (6) and a can lid hook (7) are formed and engaged with each other.

In the above, the non-metallic can (1) is manufactured by attaching the lid (4) to both ends of the can body (2) by a double seaming method. When attaching the lids (4) to both ends of the can body (2), as shown in Figure 1, the can IN (2) is not processed in any way, and the periphery of the top lid (4) and the bottom lid are is provided with a flange (10) having a curl (9) whose tip is directed toward the peripheral wall (8) of the concave portion (3). Sealing powder (as shown) is applied to the required positions on the back side of the flange (10) of the lid (4).

Then, attach one lid (4) so that its concave portion (3) is located at the can body (
2) Place it over the top of the can body (2) so that it fits into the top opening, and align the centers of both. At this time, the recessed part (3
) A gap exists between the peripheral wall (8) of the can body (2) and the can body (2). The width (X) of this gap and the wall thickness (Y) of the can body preferably have a relationship expressed by the formula 0°5Y≦X≦2.5Y. The can body (2) is placed on a lifter (not shown). In this state, insert the seaming chuck (11) into the concave part (3) of the lid (4), and bring the bottom surface into close contact with the bottom wall of the concave part (3), and the circumferential surface of the concave part (3). Peripheral wall (
8). The seaming grooves (
14) The outer diameter of the effective seaming area (16) of the flange wall facing (15) is twice the seaming thickness T) of the seaming part (5) from the outside diameter of the can body (2). It is equal to the length minus the length of minutes. In addition, the lower part of the seaming groove (14) of the first seaming roll (12) contacts the can body (2) and moves the can body (2) inward before the first seaming is completed. A flange (17) for processing is provided. Then, while rotating the chuck (11), the first seaming tightening rule (1
2) is rotated and moved toward the chuck (11), first the flange (10) and curl (
9) hits the inner surface of the wll (14) and is deformed so as to be rolled up, and then the tip of the curl (9) touches the can body (2).
), the processing flange (17) contacts the can body (2) and the can body (2) is dented inward over its entire circumference (see Figure 2). And the first seaming roll (12)
When the can 1i1 (
2) is pushed inward by the processing flange (17) and pushed upward by the lifter, so the upper end portion of the can body (2) is bent inward into a crosswise simplified U-shape, creating a dent over the entire circumference. (18) is formed. The inner end of the transversely simplified U-shaped recess (18) 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). Become (3rd
(see figure). Furthermore, the first seaming roll (12) is chucked (
11) and wrap the tip of the flange (10) and curl (9) of the lid (4) into the recess (18), that is, under the can body hook forming part (19) to complete the first roll tightening ( (See Figure 4). Next, the second seaming roll (13) is rotated and brought closer to the chuck (11), and the can body hook forming part (19) of the can JR (2) rolled up by the first seaming roll (12) is moved. And the tip of the flange (10) of M (4) and the curl (9) are connected to the seaming groove (
15) and the effective seaming part (16) of the flange wall of the chuck (11), the second seaming is performed by compressing and filling the area between the can body hook (6) and the can lid hook (7). , and join them together to form a seaming part (
5) Form. At this time, the lower flange of the seaming groove (15) of the second seaming roll (13) is in contact with the can body (2) (see FIG. 5). Next, place the can body (2) upside down on the lifter, cover the other end of the can 114 (2) with another lid, and perform the same seaming as described above to secure both seaming parts (5). The outer periphery is located concentrically and on the same circle as the outer periphery of the can body (2).

In the above embodiment, the can body (
The end of 2) is straight without any processing, but it is not limited to this, and the can body (
The opening end of 2) may be bent slightly outward. The amount of bending in this case is such that even if the material is stretched due to outward protrusion, no cracks will occur in the material. Further, in the above embodiment, the flange of the second seaming roll (13) below the seaming groove (15) is in contact with the can body (2) during the second seaming, but the present invention is not limited to this. Therefore, the flange of the second seaming roll (13) below the seaming groove (15) does not necessarily come into contact with the can l11 (2).

Effects of the Invention According to the method of attaching a lid to a non-metallic can body of the present invention, the first
As a seaming roll, a processing flange is used which is provided below the seaming groove to contact the can body and dent the can body inward by the end of the first seaming process. Place the chuck over the open end of the can body so that the part fits into the opening of the can body, align the centers of both, and fit the chuck into the recess;
In this state, by bringing the first seaming roll close to the chuck, the processing flange is brought into contact with the can body and the can body is dented inward around the entire circumference, and pressure is applied to the lid flange to cause the flange to enter the dent. Then, by bringing the first tightening roll close to the chuck, the second roll is rolled so that the part of the can body near the opening end and the flange of the lid are completely rolled up and crushed. The lid is attached to the can body by the method of the present invention because the seaming is performed to form a seamed part and the outer periphery of this seamed part is located concentrically and approximately on the same circle as the outside of the can body. In non-metallic cans, it is possible to eliminate various problems that occur as a result of the upper and lower seaming portions overlapping.

Moreover, when the can body is dented inward by the first seaming roll, no force is applied to the can body to stretch it, so cracks occur in the part of the can body that becomes the can body hook. is prevented.

Therefore, various problems caused as a result of the above-mentioned cracks can be eliminated. Furthermore, it is possible to seal the can body using the indentation made in the can body by the first seaming roll without having to provide a flange at the open end of the can body in advance as in the conventional method, which facilitates manufacturing work. become.

[Brief explanation of the drawing]

1 to 4 are partially cutaway front views showing successive stages of this method, and FIG. 5 is a partially cutaway front view showing the final stage of the method of the present invention. Figure 6 is a partially cutaway front view showing the progress of the conventional method;
The figure is a partially cutaway front view of two nonmetallic cans showing the problem of nonmetallic cans with lids attached to can bodies by conventional methods. (2)...Nonmetallic cylindrical can body, (3)...Concave portion,
(4)...metal lid, (5)...sealing part, (10)
...Flange, (11) ... Sealing chuck, (12
)...First seaming roll, (13)...Second seaming roll, (14)...Seaming groove of first seaming roll, (17)
...Processing flange, (18)...dent. Applicant for the above patent Showa Products Co., Ltd. iii Figure 7 Procedure amendment document March 1985 Ly mouth indication 1985 Patent application No. 144937
Name of the No. Person who provides a method for attaching a lid to a non-metallic can body Relationship with the matter Patent applicant: Address: 1 Ryukeji-cho, Higashi-ku, Osaka Name: Showa Products Co., Ltd. 4 non-human persons Date Showa 1999 Number of Inventions Increased from 7, Supplement 1 ■ 8, Supplement Contents of the Amendment (1) The statement in the scope of claims column of the specification is amended as shown in the attached sheet. (2) In the first line of page 3 of the same book, ``as well as gi'' is corrected to ``composite material mainly made of paper.'' Delete "either one of" in the second line of the same page. Correct "1 type" in line 3 of the same page to "any one type." (3) On page 15, line 2, "Can body hook part" has been corrected to "Can body hook (end) part." In line 6 of the same page, ``It was not manufactured'' was corrected to ``The lid was attached to the can body (2).'' (4) "Method for manufacturing non-metal cans" on page 6, line 10 of the same book is corrected to "Method for attaching lids to non-metal can bodies." In line 11 of the same page, "as well as paper" is corrected to "composite material mainly made of paper." In the same page, line 1, line 2, ``among the composite materials mainly consisting of one of the following'' is corrected to ``any of the composite materials mainly consisting of the.'' Correct "pasting" to "pasting". (6) In the same book, page 10, line 9, "laminate" is corrected to "use". In line 10 of the same page, the word ``coated'' is corrected to ``laminate.'' (7) "Made of plastic" in line 4 on page 11 of the same book is corrected to "Plasti Juku." (8) Shoshō - page 18', line 16, "outside" is "periphery"
I am corrected. When attaching a metal lid having a recess that is fitted into the opening of the cylindrical can body to the open end of a non-metallic cylindrical can body made of any one of the above claims, the outer diameter of the recess of the lid is smaller than the inner diameter of the opening of the can body, a curled flange is provided on the periphery of the lid, first and second seaming rolls and a chuck are provided,
The first seaming roll is equipped with a processing flange below the seaming groove that contacts the can body and recesses the can body inwardly before the first seaming is completed. by placing it over the open end of the can body so that the concave part enters the opening of the can body, aligning the center of the canvas, fitting the chuck into the concave part, and in this state bringing the first seaming roll close to the chuck. The flange is brought into contact with the can body and the can body is dented inward around the entire circumference, and the flange is tightened completely by applying pressure to the flange of the lid and rolling the flange into the dent. It is characterized by performing a second wrapping so as to roll it up and crush it to form a seamed part, and to make the outer periphery of the seamed part exist on the same circle concentrically with the outer periphery of the can body or on the inside thereof. How to attach a lid to a non-metallic can body.

Claims (1)

[Claims] A non-metallic cylindrical can body made of one of paper, plastic, and a composite material mainly composed of either paper or plastic is provided with a recessed part fitted into the opening of the cylindrical can body at the open end. When attaching the metal lid, the outside diameter of the recessed part of the lid is made smaller than the inside diameter of the opening of the can body, a curled flange is provided around the periphery of the lid, and the first and second
A seaming roll and a chuck are prepared, and a processing flange is placed below the seaming groove as the first seaming roll to contact the can body and dent the can body inward before the first seaming is completed. First, place the lid over the open end of the can body so that the concave part enters the opening of the can body, align the centers of both, fit the chuck into the concave part, and in this state By bringing the seaming roll close to the chuck, the flange is brought into contact with the can body and the can body is dented inward over the entire circumference, and pressure is applied to the flange of the lid to roll the flange into the dent. Perform the seaming and then the second
By bringing the seaming roll close to the chuck, a second seaming is performed so that the part of the can body near the opening end and the flange of the lid are completely rolled up and crushed to form a seaming part. A method for attaching a lid to a non-metallic can body, characterized in that the outer periphery of the lid is located concentrically with the outer periphery of the can body, on approximately the same circle, or inwardly from the outer periphery of the can body.