JP2003081318A - Can body with seal cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a can body with a seal cover which is simply structured for realizing a chafing function requiring no chafing ring, and is suitable for recycling. SOLUTION: The opening hole 3 of a top cover 4 is formed in a shape having a straight lined chafing end 31. The heat welded part of a seal cover 5 comprises a first heat seal part 8 heat welded continuously to the total peripheral edge of the cover 4 and a second heat seal part 9 heat welded to the peripheral edge of the hole 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a can body for accommodating powder or granules, such as a milk powder can, and more particularly to a seal lid having a scraping portion for weighing contents and covering an opening hole of a canopy. And a can body with a seal lid.

[0002]

2. Description of the Related Art A conventional powdered milk can body includes a can body and a canopy having a circular opening hole which is fixed to the upper end of the can body by winding.
And a seal lid that covers the opening hole (see Japanese Patent Laid-Open No. 7-232778). A resin scraping ring is adhered to the opening of the canopy, and the scraping ring is provided with a scraping portion that extends linearly across the opening. It was possible to measure a predetermined amount. Further, in Japanese Patent Laid-Open No. 2001-130561, a panel member of a can lid wound around a can container has an opening portion and a scraping plate portion, and a sealing member for covering the opening portion and the scraping plate portion is first bonded. There is described a can lid in which a second adhesive portion is provided along the scraped edge so as to be detachable via the portion and seals a gap formed between the scraped plate portion and the seal member.

[0003]

However, the conventional can body with a seal lid has a large number of parts such as a canopy, a scraping ring and a seal lid, has a complicated structure, and has a problem of high cost. . In addition, since a scraping ring made of a resin made of a different material is bonded to the metal canopy, there is a problem in terms of separate disposal. Furthermore, Japanese Patent Laid-Open No. 2001-130
In the can lid described in Japanese Patent No. 561 Publication, since the second adhesive portion is formed only along the scraping edge, the powder food is scraped off from between the first adhesive portion and the second adhesive portion. There is a problem of breaking into the department.

The present invention has been made in order to solve the above-mentioned problems of the prior art. It realizes a scraping function with a simple structure without using a scraping ring, and is further suitable for recycling. To provide. Another object of the present invention is to provide a can body with a seal lid that prevents the powdered food product from entering the scraped plate portion.

[0005]

In order to achieve the above object, according to the present invention, a can body, a canopy provided with an opening hole which is fixed to the upper end of the can body by winding, and a canopy of the canopy. In a can body with a seal lid which covers the opening hole and is heat-welded to the canopy, the opening hole is formed into a shape having a linear portion, and the scraping portion of the contents is formed by the linear portion. The heat-sealing portion of the seal lid is composed of a first heat-sealing portion that is continuously heat-welded around the entire circumference of the canopy, and a second heat-sealing portion that is heat-welded to the peripheral edge of the opening hole. Is characterized by.

It is preferable that the second heat seal portion has a smaller seal width than the first heat seal portion. Also, the second
It is preferable that the heat seal portion is formed on the entire circumference of the peripheral edge portion of the opening hole. Further, the second heat seal portion may have a broken line-shaped cut. In this case, the cut is formed by forming an uneven pattern in a region including the first heat seal part inside the second heat seal part of the seal lid, and forming the cut of the second heat seal part by this uneven pattern. Good.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on the illustrated embodiments. 1 and 2 show a can body with a seal lid according to an embodiment of the present invention. That is,
The can body 1 with a seal lid includes a can body 2, a canopy 4 having an opening hole 3 which is fixed to the upper end of the can body 2 by winding, and a canopy 4
A sealing lid 5 which covers the opening hole 3 and is heat-sealed to the canopy 4. A bottom cover 6 is wound around the lower end of the can body 2 as shown in FIG. 2B, but the bottom cover 6 is open before filling the contents, and after the contents are filled, the bottom cover 6 is closed.
Is fastened to.

The canopy 4 includes a panel portion 41 and a panel portion 41.
From a peripheral wall portion 42 that rises upward from the peripheral edge of the peripheral wall portion 42, and a curl portion 43 that extends radially outward from the upper end of the peripheral wall portion 42 and is wound together with the flange portion 21 at the upper end of the can body 2 to form the winding tightening portion 7. It is configured. An annular projection 44 having a predetermined width is formed on the peripheral edge of the panel 41.
The annular convex portion 44 has a substantially trapezoidal cross section, and the seal lid 5 is welded to the flat surface of the top portion 44a. The opening hole 3 is formed by partially opening an area inside the annular convex portion 44.
Is shaped to have a linear portion 30, and the linear portion constitutes a scraping portion 31 of a spoon for scooping the contents. In this embodiment, both ends of the scraped-off portion 31 are connected to the circular arc portion 32 formed concentrically with the annular convex portion 44, and have a D-shape as a whole.

The scraping portion 31 is provided at a position separated from the center of the canopy 4 by a predetermined distance, and the arc portion 32 is halved.
It has an arc shape that is longer than the arc. Also, the arc portion 3
2 and the linear scraping portion 31 has rounded corners. Further, the hole edge portion of the opening hole 3 is a curl portion 33 which is rounded inside the can body. The curl portion 33 has one winding, and a wedge-shaped gap g is provided between the curl portion 33 and the inner surface of the panel portion 41.
The end 33a of No. 3 is in close contact with the inner surface of the panel 41. Further, when the spoon is scraped off, the spoon comes into sliding contact with the lower edge of the curl portion 30 of the linear scraping portion 30.

On the other hand, the seal lid 5 is the panel portion 41 of the canopy 4.
It is a circular shape that covers the whole, and the heat-sealed portion of the seal lid 5 is the canopy 4
The first heat seal portion 8 is continuously heat-welded to the entire circumference of the first heat seal portion 8 and the second heat seal portion 9 is heat welded to the peripheral edge portion of the opening hole 4. In the heat sealing method, for example, the canopy 4 is heated with high frequency. According to the high frequency heating method, only one heating coil is required, and the first heat seal portion 8 on the outer peripheral portion and the inner half-moon shape can be bonded at the same time.
The first heat seal portion 8 is heat-welded to the upper surface of the annular convex portion 44, and is airtightly adhered over the entire width of the upper surface of the annular convex portion 44. On the other hand, the second heat seal portion 9 has the first
The width is smaller than that of the heat seal portion 8, and in this embodiment, it is welded in line contact with the upper edge of the curl portion that borders the opening hole 3.

The second heat seal portion 9 is for preventing powder contents such as milk powder from entering the gap between the seal lid 5 and the top surface of the region where the canopy 4 is not opened. In this embodiment, the cuts 9a are formed at predetermined intervals.
Is extended in the shape of a broken line and is not airtight. As for the seal lid 5, as shown in FIG. 2A, the uneven pattern 10 may be formed inside the first heat seal portion 8 in a region including the second heat seal portion 9. By providing the concavo-convex pattern 10 in this manner, the cut 9a can be formed only by performing normal heat sealing. That is, the convex portion is bonded to the sealing surface, and the concave portion becomes a break. Also,
The seal lid 5 is provided with a tab 51 for opening.

Next, with reference to FIG. 3, the sectional structure of each member will be described. Canopy 4 is a tin plate (SPTE)
Coatings 4b, 4c made of synthetic resin on the inner and outer surfaces of the metal material 4a such as
And a PE layer 4d for heat sealing is coated on the outer coating film 4b. The seal lid 5 has PE on the inner surface and the outer surface of the aluminum foil 5a.
T film 5b and 5c are laminated, and further PET inside
A PE layer 5d for heat sealing is laminated on the film 5b. FIG. 4 shows a manufacturing process of the can body with a seal lid of the present invention. For tin barrel 2, tin material 1
The outer surface of No. 00 is baked and rolled to form a cylindrical body, and the joint is welded (welded body). Next, edge bending of the upper and lower flange portions is performed. For the seal lid 5,
Polyethylene and polyethylene terephthalate films 101 and 102 are formed, and the films 101 and 102 and the aluminum foil 103 are laminated and heated to produce a laminated film 104. The laminated film 104 is punched into a predetermined shape to form the seal lid 5. At the time of this punching, the tab 51 is also molded.

On the other hand, with respect to the canopy 4, first, a coating film of synthetic resin is formed on the front and back surfaces of the tin plate material 110 by coating and baking an epoxyphenol-based paint and a polyesteramino-based paint, respectively. Next, a spot coat 111 made of polyethylene is applied to the surface of the tin plate material 110.
The spot coat 111 is coated in a circular shape having a diameter equal to the outer diameter of the annular convex portion 44 of the canopy 4. Next, punching into a canopy shape and curling the outer diameter end portion are performed, a compound is applied to the curl portion 43 and dried, and the opening hole 3 is punched and molded. After that, the seal lid 5 is heat-sealed to close the opening hole 3, and is wound around and fixed to the upper end portion of the can body 2 to form the can body 11. On the other hand, the ground lid 6 is obtained by punching and curling the tin plate material 110, applying a compound to the curl portion, and drying the curl portion.

The can body formed as described above is filled with powder such as milk powder from the bottom of the can body 11, and then the bottom cover 6 is fixed by winding. The powder of the content is sealed by the second heat seal portion 9 around the peripheral edge of the opening hole 3, and it is possible to prevent the powder from entering the gap between the upper surface of the canopy 4 which is not opened and the seal lid 5. it can. In addition, the entire top surface of the canopy 4 is hermetically sealed by the first heat seal portion 8,
The alteration of the contents is prevented. At the time of use, the tab 51 is pulled up and the seal lid 5 is peeled off from the canopy 4. At the time of this peeling, the second heat seal portion 9 is linear and has a narrow seal width,
Moreover, since there is a broken line 9a, the peel strength is weak,
The force required for actual peeling is almost the same as the force for peeling the first heat-sealing portion 8 and can be easily peeled off. When measuring the contents, the spoon scooping the contents is scraped off by using the scraping portion 31 of the canopy 4, whereby one spoonful can be accurately measured. Further, at the time of discarding, since the canopy 4, the can body 2 and the bottom cover 6 are all made of the same metal material, they can be disposed of without being particularly sorted and have good recyclability.

[0015]

As described above, according to the present invention, the opening hole is formed to have a linear scraping portion, and the scraping portion is constituted by the canopy itself. This eliminates the need for a scraping ring, reduces the number of parts, and improves the separability of waste. In particular,
Recyclability can be further improved by using the same material for the canopy and the can body. Further, the heat-welding portion of the seal lid is constituted by the first heat-sealing portion which is continuously heat-welded around the entire circumference of the canopy, and the second heat-sealing portion which is heat-welded at the peripheral edge of the opening hole. The first heat-sealing portion can hermetically seal the entire top surface of the canopy and keep it hygienic. Further, by providing the second heat seal portion, it is possible to prevent the contents from entering the gap between the top surface of the area where the top cover is not open and the seal lid.

According to the second aspect of the present invention, by making the seal width of the second heat seal portion smaller than that of the first heat seal portion, it is possible to avoid the peel strength of the seal lid from being unnecessarily increased. The seal lid can be easily peeled off. According to the invention as set forth in claim 4, the second heat-sealing portion is configured so as to have a cut line in the shape of a broken line, so that the peeling strength can be reduced as much as possible while preventing the entry of the contents. . According to the invention as set forth in claim 5, the seal lid is provided with the second inner portion than the first heat seal portion.
By forming a concavo-convex pattern in the area including the heat-sealing part and forming the discontinuity of the second heat-sealing part by the concavo-convex pattern of the concavo-convex pattern, the discontinuity can be easily formed.

[Brief description of drawings]

FIG. 1 (A) is a partially cutaway top view of a can body with a seal lid according to an embodiment of the present invention, and FIG. 1 (B) is the same view (A).
6B is a partial cross-sectional view taken along line BB, FIG. 6C is an enlarged view of portion C in FIG. 6B, and FIG.

2 (A) is a top view of a can body in which the seal lid of FIG. 1 is provided with an uneven pattern, and FIG. 2 (B) is a front view of a half section of FIG. 2 (A).

FIG. 3 is an enlarged cross-sectional configuration diagram of a canopy and a seal lid.

FIG. 4 is an explanatory view showing a forming process of the can body of FIG. 1.

[Explanation of symbols]

1 can 2 can barrel 21 Flange 3 openings 30 straight part 31 Scraped part 32 arc part 33 Curl section 33a end 4 canopy 41 panel section 42 Peripheral wall 43 Curl section 44 annular protrusion 44a top 4a Metal material 4b, 4c coating film 4d PE layer 5 seal lid 51 tabs 5a aluminum foil 5b, 5c PET film 5d PE layer 6 canopy 7 winding section 8 First heat seal part 9 Second heat seal part 9a break 10 uneven pattern g gap

Claims (5)

[Claims] 1. A seal lid including a can body, a canopy having an opening hole that is wound and fixed to an upper end of the can body, and a seal lid that covers the opening hole of the canopy and is heat-welded to the canopy. In the attached can body, the shape of the opening hole is a shape including a linear portion, the scraped portion of the contents is configured by the linear portion, and the heat-welded portion of the seal lid is continuous over the entire circumference of the canopy. A can body with a heat-seal lid, comprising a first heat-sealed portion that is heat-welded and a second heat-sealed portion that is heat-welded to the peripheral edge of the opening hole. 2. The can body with a seal lid according to claim 1, wherein the second heat seal portion has a seal width smaller than that of the first heat seal portion. 3. The can body with a seal lid according to claim 1, wherein the second heat seal portion is heat-welded to the entire circumference of the peripheral edge portion of the opening. 4. The can body with a seal lid according to claim 1, wherein the second heat seal portion has a broken line-shaped cut. 5. An uneven pattern is formed in a region including the first heat seal part inside the second heat seal part of the seal lid, and a cut of the second heat seal part is formed by the unevenness of the uneven pattern. The can body with a seal lid according to any one of claims 1 to 4.