JPH03148446A - Container with metallic lid - Google Patents

Abstract

PURPOSE:To surely form a lock seam between the brim of a metallic lid and a flange of a container main body and provide ease of taking out the content by a method wherein the container main body has an annular shoulder part below the flange to provide a clearance between the flange and the metallic lid, and a circular half-cut line made on the metallic lid is located above the annular shoulder part. CONSTITUTION:To obtain a container 10 with a metallic lid 16, the brim of the metallic lid 16 is rolled on a flange 13 of the container main body 10 to form a lock seam after a content 19 is put in the container main body 11. A circular half-cut line 25 is made on the surface of the metallic lid 16 and a pull tab 29 is attached on the lid. When the pull tab 29 is pulled up, the metallic lid 16 is broken along the circular half-cut line 25, so that the metallic lid 16 is opened. The container main body 11 has an annular shoulder part 26 below a flange 13, and the shoulder part 26 is converged downward. The circular half-cut line 25 is located above the annular shoulder part 26 and outside the diameter of a lower end 27. The content 19 filled up to the lower end 27 of the shoulder part 26 can be taken out of the container without hanging on the remaining part of the metallic lid 16.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a container with a metal lid, which comprises a plastic container body and a metal lid. (Prior Art) Metal containers, such as metal cans, have various shapes, but can be classified into three-piece cans and two-piece cans based on the structure of the can body. A three-piece can is also called a tin solder can, and has a structure in which the cylindrical body, lid, and bottom are sealed with double seams. On the other hand, a two-piece can is also called a stamped tin can, and has a structure in which the body and bottom (container body) are integrally molded, and the lid is double-sealed. These metal cans are used as food packaging containers for various canned foods, juices, soft drinks, jams, dried foods, etc., and are rigid containers with particularly excellent sealing and preservation functions. However, metal cans have the following points to be improved. In other words, since it is a metal can, there is a limit to its weight reduction. ■ Once it is crushed by impact, it will not recover and will be deformed. ■ Compared to plastic containers, the energy cost of manufacturing them is higher. ■ If the display effect of the container exterior is made of metal, it cannot be changed freely and the only means of exterior packaging is printing. 0 It is impossible to create a transparent container that allows the contents to be checked without opening it. In order to solve these drawbacks of conventional metal cans,
A container with a metal lid may be considered, which is a container with a metal lid attached to a plastic container body containing contents such as pudding, jelly, and water yokan. In addition, as a method for manufacturing plastic container bodies, a general thermoforming method is used to heat a laminated material having the thickness required for container formation, and a mold is used to form a molded product of the container body with a flange. How to do (sheet forming)
is considered. (Problems to be Solved by the Invention) As described above, instead of conventional metal cans, containers with metal lids, which are made of plastic container bodies with metal lids attached, have been considered. In this case, the container main body is constructed by providing a flange portion around the upper opening of the body, and a container with a metal lid is obtained by wrapping the peripheral edge of the metal lid around the flange portion. Incidentally, a container with a metal lid is sometimes filled with contents at a high temperature, but in this case, the plastic container body may become soft and the seaming operation may not be performed reliably. Further, a container with a metal lid is known in which the metal lid is provided with an annular half-cut line for easy opening. In this container with a metal lid, the metal lid is opened using an annular half-cut line, and the container is pulled back to take out the contents. However, in this case, the part of the metal lid outside the half-cut line remains even after opening, so when taking out the contents, the contents, such as jelly, get caught in this remaining part of the metal lid and cannot be taken out easily. Sometimes. The present invention has been made with these points in mind.
It is an object of the present invention to provide a container with a metal lid, which allows reliable seaming between the peripheral edge of the metal lid and the flange of the container body, and also allows the contents to be easily and reliably taken out. [Structure of the Invention] (Means for Solving the Problems) The present invention comprises a plastic container main body having a flange portion at an upper end opening, and a metal lid having a peripheral edge portion around which the flange portion is wound. The main body has an annular step below the flange that forms a predetermined gap with the metal lid, and the metal lid is provided with an annular half-cut line located above the annular step. It is a container with a metal lid. (Function) When the contents are filled to the vicinity of the step, the metal lid can be opened by breaking along the annular half-cut line, and the contents can be taken out cleanly without getting caught on the rest of the metal lid by repeating the process. Can be done. (Example) Hereinafter, an example of the present invention will be described with reference to the drawings. FIGS. 1 and 2 are diagrams showing an embodiment of a container with a metal lid according to the present invention. First, a container with a metal lid according to the present invention will be explained with reference to FIG. As shown in FIG. 1, the container body 11 includes a body 12a having an upper opening, a bottom 12b, and a body 12m.
The container body 11 is made of plastic as a whole. Jelly,
A container 1° with a metal lid is obtained by storing contents 19 such as pudding or water bottle, and wrapping the peripheral edge 17 of the metal lid 16 around the flange 13. Further, as shown in FIG. 1, an annular half-cut line 25 for easy opening is provided on the surface of the metal lid 16. Furthermore, the annular H7 cut line 25 on the surface of the metal lid 16
A pull tab 29 is fixed to the inside of the holder. and,
By pulling this pull tab 29, the metal lid 16 is broken along the annular half-cut line 25, and the metal lid 16 is opened. Further, below the flange portion 13 of the container body 11, an annular stepped portion 26 is provided that forms a predetermined gap with the metal lid 16. As shown in FIG. 1, the annular step portion 26 has a cross-sectional shape that slopes radially inward and downward. Note that the contents 19 are filled up to the vicinity of the lower part 27 of the annular stepped portion 26 . Further, the annular half-cut line 25 is located on the annular step 26, that is, radially inward from the upper end 28 of the annular half-cut line 25, and is located at the lower end 28 of the annular half-cut line 25.
7 is located radially outward. Next, the materials of each part will be explained. The container body 11 is created by thermoforming a laminated material by general sheet forming. The layer structure of this laminate is: polypropylene (500μ)/adhesive layer (50μ)/ethylene-vinyl alcohol copolymer (EVOH) (50μ).
)/adhesive layer (50μ)/polypropylene (500μ). Further, the metal lid 16 is made of aluminum, and its front and back surfaces are coated with synthetic resin. Next, a method for manufacturing a container with a metal lid having such a configuration will be described. First, with reference to FIG. 2, a process of manufacturing a molded product of a container body by thermoforming by general sheet forming will be described. That is, a molded product 20 consisting of a plurality of container bodies 11 is formed by heating a laminated material 30 having the thickness necessary for forming a container and having the above-described layer structure with a heating machine 41, and using a mold 42 by a general molding method. to form. The molding method may be air pressure molding, vacuum molding, or a combination thereof. Body portion 1 of each container body 11 constituting the obtained molded product 20
2a has a thickness and strength sufficient to withstand the pressure applied during double seaming. However, the flange portion 13 is too thick and is not suitable for double seaming. Therefore, a pressing process for the flange portion 13 is required as described later. Next, the container bodies 11 constituting the molded product 20 are separated one by one, and then the thickness of the flange portion 13 is reduced (pressing step), and the width of the flange portion 13 is set to a predetermined width (cutting step). A container body 11 shown in the figure is obtained. The high-temperature contents 19 are stored in the container body 11 obtained in this manner. Subsequently, the peripheral portion 17 of the metal lid 16 is wound around the flange portion 13 of the container body 11, and the container 10 with a metal lid is manufactured. The user pulls the bulltab 29 upward, breaks the metal lid 16 along the annular half-cut line 25, and opens the metal lid 16. Next, the user pulls back the metal lid container 10 and takes out the contents 19 such as jelly. In this case, since the annular half-cut line 25 is disposed on the annular step 26, the contents 19 filled up to the vicinity of the lower end 27 of the annular step 26 are transferred to the remaining part of the metal lid 16 (the annular half-cut line 25). It can be taken out cleanly without getting caught in the remaining parts (more radially outward). (Specific Example) Next, a specific example of the present invention will be described. A metal lid container was created under the following molding conditions. Forming method Nibrag assisted pressure air vacuum formable container body shape: diameter 68.0cm/@, depth a4. Og+/s Contents: Water and sulfur filling temperature = 80°C Metal lid ° Nialuminum Nominal diameter 211 Also, the length a between the upper end 28 of the annular step 26 and the metal lid 16 is 0
．． The angle of inclination θ of the annular step portion 26 was set at 40° to 60°. In the container 10 with a metal lid created in this manner, the flange portion 13 of the container body 11 and the peripheral edge portion 17 of the metal lid 16 were tightly wound together in a good state. Further, after opening the metal lid 16, the contents 19 could be taken out easily and cleanly. - Note that the length a between the upper end 28 of the annular step 26 and the metal lid 16 is 0.2 l-~0.8*/s, and the annular step 2
The reason why the above-mentioned good results were obtained when the inclination angle θ of No. 6 was set to 40e to 60° is considered to be due to the following reasons. Reason■ Length a is 0.8@/@ or more or inclination angle θ is 40@
In the following cases, when the contents 19 are taken out after opening the metal lid 16, the contents get caught in the remaining portion of the metal lid 16 and cannot be taken out cleanly. That is, the length a is 0.8■/s
If the container is larger, the container 10 with a metal lid is turned over to remove the contents 19.
When taking out the contents, the contents part 19 swings from side to side and gets caught in the remaining part of the metal lid 16. Also, if the inclination angle θ is smaller than 40@, it is annular! Since the %-cut line 25 is located near the lower end 27 of the annular stepped portion 26, when the contents are taken out, the contents 19 are caught on the remaining portion of the metal lid 16. Reason ■ On the other hand, the length a is 0.2m/■ or less or the inclination angle θ is 6
In the case of 0@ or more, the state in which the flange portion 13 and the peripheral edge portion 17 are tightened will be impaired. That is, the length a is (L
In the case of 211/■ or less, the tightening force is immediately transmitted to the inclined annular step portion 26. In this case, the annular step portion 26 that has been softened by being filled at high temperature is not stable in terms of strength, so that the flange portion 13 is displaced from the peripheral edge portion 17 during tightening. Further, if the inclination angle θ is 60@ or more, the annular step portion 26 softened by high-temperature filling becomes unstable in the vertical direction, and the flange portion 13 shifts from the peripheral portion 17 during tightening. In the above embodiment, an example was shown in which the container body 11 was thermoformed using a laminated material having the above-mentioned layer structure.
, polystyrene (PS), polyethylene terephthalate (PET), or vinyl chloride (PCV). Further, as the layer structure of the laminated material, a PVDC layer or a polyarylate layer may be used in consideration of heat resistance and gas barrier properties. [Effects of the Invention] As explained above, according to the present invention, when the contents are filled up to the vicinity of the stepped portion, the contents can be easily and reliably and cleanly taken out by opening the metal lid and turning it over again. be able to.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of a container with a metal lid according to the present invention, and FIG. 2 is a diagram showing a process of manufacturing a molded product of the container body by thermoforming by sheet forming. 10-- Container with metal lid, 11-- Container body, 12
a--Body part, 12 b--Bottom part, 13--Flange part, 16--Metal lid, 17--Peripheral part, 25--
・Annular half-cut line, 26...Annular step, 29...
- Bull tab. Applicant's agent: Sato - Yuichiri ==〒=1~! ty1 figure 2nd figure

Claims (1)

[Claims] 1. A container body made of plastic having a flange portion at the top opening, and a metal lid having a peripheral edge portion around the flange portion, and the container body has the metal lid and the metal lid below the flange. 1. A container with a metal lid, characterized in that the metal lid has an annular step forming a predetermined gap therebetween, and the metal lid is provided with an annular half-cut line located on the annular step. 2. The container with a metal lid according to claim 1, wherein the annular stepped portion has a cross-sectional shape that slopes downward in a radial direction. 3. The gap between the annular step and the metal lid is 0.2 mm or more and 0.8 mm or less, and the inclination angle of the annular step is 4.
The container with a metal lid according to claim 1, characterized in that the angle is 0° or more and 60° or less.