JPH09239473A - Positive pressure can and heat seal can lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a positive pressure can having a simple construction in which a drinking mouth comes out by peeling lid material and which is arranged with a low cost heat sealed can lid. SOLUTION: The positive pressure 11a can consists of a can barrel 11b and a can lid seamed to the can barrel 11b. In the can lid 11, a drinking mouth 16 is formed to part of its top board 14. The drinking mouth 16 is plugged by a lid material 15 stuck with heat seal almost in whole region of the top board 14. When drinking the contents of can (for example beer), the drinking mouth 16 is opened by peeling the lid material 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positive pressure can such as a beer can and a cola can, and more particularly to a heat-sealed can lid in which a drinking port and an air port are closed with a lid material, and a positive pressure can equipped with the lid.

[0002]

2. Description of the Related Art Nowadays, cans such as beer cans, cola cans and the like are generally composed of a bottomed cylindrical can body and a can lid that closes the open end of the can body. There are various types of can lids, but the mainstream of them is an easy-open can lid, that is, an easily open can lid that can be easily opened by attaching a pull tab or the like. The easy-open can lid is roughly classified into a type that removes the opening piece that forms the opening by pulling up the pull tab, and a push-open type (SOT that pushes the opening piece into the container and the tab cannot be removed from the can lid). Called). Recently, this push-open type has dominated.

For example, a push-open type simple opening can lid 10 has a circular top plate (panel) as shown in FIG.
1, a winding tightening portion 2 provided on the periphery of the top plate 1 and wound around a can body (not shown), and an outer peripheral groove 3 provided between the winding tightening portion 2 and the top plate 1. It is partitioned by the groove-shaped score 4 between the top plate center CP of the top plate 1 and the outer peripheral groove 3, and the top plate center C
The opening piece 5 connected to the top plate 1 on the P side and the opening piece 5 at the tip
The rivet 6 is placed so as to overlap the top plate center CP side of
And the pull tab 7 connected to the center CP of the top plate. When the pull tab 7 is pulled, the tab tip 7 on the score 4 side serves as a fulcrum, the tab finger hooking portion 7b serves as a force point, and the rivet portion 7c serves as an action point, so that the score 4 shown in FIG.
8 is a pop process in which the rivet peripheral portion 4d is broken, and FIG.
Using the rivet 6 as a fulcrum, the tip end 7a of the pull tab 7 presses the base end portion of the opening piece 5 on the center plate CP side, and the remaining score 4 is broken by the pressing force, and the drinking process is performed. A mouth is formed.

[0004]

SUMMARY OF THE INVENTION In the conventional can lid described above,
There is a problem that the top plate (panel) requires complicated processing of rivets and scores, and the processing of the complicated tab itself, which increases the cost and does not provide sufficient ease of opening.
As described above, the structure of the conventional can lid is complicated and high processing accuracy is required, so that a problem is likely to occur during lid manufacturing. Further, conventionally, a positive pressure can (a container containing a drink such as cola or beer) has not been provided with a peel opening end (lid). The reason is that the peeling opening must be done by hand,
This is because the peel strength of the tear seal cannot be increased.

The present invention has been made in view of the problems of the above-mentioned prior art, and has a simple structure in which the drinking spout is revealed by easily peeling the lid material from the can lid, and the cost is low. It is an object of the present invention to provide a positive pressure can and a heat-sealed can lid which can improve the ease of drinking and pouring.

[0006]

A positive pressure can of the present invention for achieving the above object comprises a can body and a can lid mounted on the can body by winding, and a top plate of the can lid. And a lid member for covering the drinking port, the cover member including a base material and a sealant is adhered to the top plate by heat sealing.
Further, the drinking mouth can be composed of a plurality of small holes. Further, the can body and the can lid are made of the same material. An air port is formed on the top plate on the side opposite to the drinking port, and the air port is also closed by the lid member. In addition, the adhesive strength of the peeling end portion of the lid material is larger than the adhesive strength of the peeling start end portion, and the lid material may be attached so as to cover almost the entire top plate. it can.

In the heat-sealed can lid of the present invention, a drinking port is formed on the top plate of the can lid, and the lid member provided with the base material and the sealant for covering the drinking port heats the top plate. It is characterized by being adhered by a seal.

In the positive pressure can of the above construction, the lid member is peeled off from the can lid to open the drinking mouth, and the contents of the can are drunk through the drinking mouth. When the drinking mouth is composed of a plurality of small holes,
Good foaming when pouring beer into a mug or the like through the mouth. By providing an air port on the can lid, the contents can easily come out from the drinking port, making it easier to drink.

[0009]

Next, an embodiment of the present invention will be described with reference to the drawings. 1 (a) and 1 (b)
[Fig. 1] is a plan view and a longitudinal sectional view of a first embodiment of a heat-sealing can lid for a positive pressure can according to the present invention, respectively.

First, as shown in FIG. 1, the heat seal can lid 11 includes a flat top plate (panel) 14 and the top plate 1.
4, the winding tightening portion 12 provided on the peripheral edge of the winding 4, and the winding tightening portion 12
And an outer peripheral groove 13 provided around the top plate 14. In this example, the can lid 11 is made of aluminum and has a coating layer on its inner and outer surfaces. A drinking port 16 is formed on one end side of the top plate 14, and the drinking port 16 is a circular lid material (opening seal) 1 attached to almost the entire top plate 14.
It is blocked by 5. The shape of the drinking spout 16 is substantially triangular, and the pair of wall surfaces are curved in a wavy shape, and the circumferential length thereof is long. As will be described later, the lid member 1
5 is not limited to one that covers the entire top plate 14, but the mouth 1
The size may be such that only 6 is closed. In this case, since the adhesion area of the lid member 15 is small, the ease of opening is improved.
Further, when the top plate 14 is made of metal, it is preferable to coat the metal exposed portion (wall surface) of the drinking mouth 16 so as not to be corroded by the contents of the can.

As shown in FIG. 3A, as an example of the structure of the lid member 15, the polyester film 1 is sequentially formed from the upper layer.
5a, printed layer 15b, aluminum foil 15 as a base material
c, the adhesive layer 15d and the sealant 15e are laminated is used. Also, as shown in FIG.
A configuration in which the polyester film 15a is removed from the one shown in FIG. 3A may be used. As the sealant 15e, generally, an upper layer and a lower layer made of, for example, low density polyethylene and EVA (ethylene-vinyl acetate copolymer) are used, but a single layer can also be used. The reason why the aluminum foil 15c is used as the base material is that it has no gas permeability and can obtain required strength. Instead of the aluminum foil, a film or paper having low gas permeability may be used.

As shown in FIG. 2, the positive pressure can 11a of the present invention.
Is a body (can body) 11 when the winding tightening portion 12 of the can lid 11 is
It is configured by being wound around b. It should be noted that the can lid 11 is provided with the drinking port 16 and is further fitted with the lid member 15 before being wound on the body 11b. The can lid 11 and the body 11b are made of the same material. Specifically, in this example, the can lid 11 does not have a tab as compared with the case of a conventional can lid, and thus it is not necessary to use a material having excellent workability of the current 5000 series, so that the material of the can lid 11 is As the material of the body 11b, an aluminum alloy plate having a material number of 3000 series in the AA standard can be used. Thus, the can lid 11 and the body 11b
By using the same type of aluminum with a low magnesium content in the can, it can be used for the technique of manufacturing both the can lid and the body without adjusting the components when recycling the can.

As shown in FIG. 1 again, the lid member 15 has a handle 17 at one end thereof, and the lid member 15 can be peeled off by lifting the handle 17. The lid 15 is
In FIG. 1 (a), the part surrounded by the alternate long and short dash line 19 is not bonded, and the part provided with the braided line 18 (the drinking mouth 16
The peeling end portion on the side opposite to has a higher adhesive strength than other portions. Accordingly, when the lid member 15 is peeled off and the drinking mouth 16 is opened, the lid member 15 is not completely separated from the can lid 11 by not peeling it off at the portion 18 having high adhesive strength, and thus the lid member 15 is not completely separated. The generation of dust due to scattering can be eliminated.

The lid member 15 is peeled off from the can lid 11, and the drinking spout 16 is formed.
Open and drink the contents of the can through this drinking mouth 16.
Further, as will be described later, by providing an air port on the can lid, the contents can easily come out from the drinking port 16,
It becomes easier to drink. In addition, in this example, the shape of the drinking mouth 16 is
Since the width is narrower toward the center of the can lid 11, the beverage is less likely to spill from the drinking port 16 and is easy to drink.
Further, by drawing, for example, characters for displaying advertisements or contents in the can on the printing layer 15b of the lid material 15, it is possible to promote advertising effects and consideration for consumers.

Next, referring to FIG. 4, the internal pressure of the can, the opening area of the drinking spout, and the circumferential length will be given to consider the form of the drinking spout. The internal pressure of the can is set to P (Kg / mm ² ) and
The opening area and the perimeter of the drinking spout 21 are S (mm
² ) and L (mm), the load G received by the lid member 20 due to the internal pressure can be expressed by the following equation. G = P · S The peeling strength μ acting on the periphery of the drinking mouth 21 of the lid member 20 when this load acts can be expressed by the following formula. FIG.
In, the reference numeral 22 indicates the wall surface of the drinking spout 21. μ = G / L = P · S / L

Conventionally, a positive pressure can (contains beverages such as cola and beer) has not been provided with this type of peeling opening type end (lid). The reason is that the peeling fracture strength B of the opening seal cannot be increased because the peeling opening must be performed by hand. That is, the following formula must be satisfied. μ <B In order to keep μ at a minimum value while keeping the maximum internal pressure resistance P _max constant, S may be made smaller by the equation. However, if S is small, the contents will not come out easily. In other words, it is hard to drink. There are two ways to solve this problem.

That is, as a first means, as shown in FIGS. 6 and 7 which will be described later, the drinking mouth is composed of a plurality of small holes, and while the μ of each small hole is kept small, a large number of holes are formed. Makes it easier for the contents to come out. As a second means, as shown in FIG. 1, the drinking mouth 16 is a single relatively large opening, but has a complicated shape with a long circumferential length L.

FIG. 5 is a plan view of a second embodiment of the heat-sealing can lid of the positive pressure can according to the present invention. In this example, the portion of the can lid 100 on the side opposite to the drinking mouth 16 is shown. A substantially cross-shaped air port 24 is formed in the.
This improves the ease with which the contents come out. Other configurations are the same as those in FIG. In addition, the air port 24
Is preferably provided at the end opposite to the mouth 16 so that the beverage does not overflow and the nose does not get wet.

FIG. 6 is a plan view of a third embodiment of the heat seal can lid of the positive pressure can according to the present invention. In the can lid 300 of this example, the drinking mouth 26 is composed of a plurality of (seven in this example) circular small holes 27 arranged in a hexagonal shape, and likewise, a plurality of air outlets 28 (in this example, in this example). (4) circular small holes 29. The lid member 30 does not cover the entire top plate 14 of the can lid 300 but has a rectangular shape that can cover the drinking opening 26 and the air opening 28, and is provided so as to extend in the radial direction of the can lid 300. There is. Other configurations are the same as those shown in FIG. In this example, since the drinking mouth 26 is constituted by a plurality of small holes 27, the ease of drinking is similar to that of FIG. Further, when the content of the can is beer, when the beer is poured into the jug or the like through the drinking opening 26 formed of the plurality of small holes 27, the foaming becomes good.

FIG. 7 is a view showing a modified example of the heat seal can lid of FIG. In this can lid 400, a plurality of small holes 32 are arranged in a triangular shape to form a drinking mouth 31, and a plurality of small holes 34 are arranged in a hexagonal shape to form an air port 33. Note that reference numeral 35 indicates a lid material. In this case, since the opening area of the small hole 32 is smaller toward the center of the can lid, the beverage is less likely to spill through the small hole 32 on the center side and is easy to drink. 6 and 7, the shape of the small hole is not limited to the circular shape, and may be a rectangular shape or a triangular shape. Further, in each of the embodiments, the mouthpiece and the air mouth can be efficiently formed by punching.

(Experimental Example) (1) In the case of a plurality of holes (FIGS. 6 and 7) (first means) Assuming beer as a beverage, the maximum internal pressure resistance P _max = 0.0.
55 (Kg / mm ² ). On the other hand, in order to easily open the lid member to some extent, the peel fracture strength B is
B = 1.2 (Kg / 15 mm) = 0.08 (Kg / m
m). Considering the ease of processing, if the small hole of the drinking mouth is a circular hole and its diameter is d (mm), then π / 4 · d ² · 0.055 / (π · d) <0.08, A d <5.8 mm is obtained. The number of such small holes provided may be determined on condition that the contents come out comfortably. In fact, by providing a similar air port on the side opposite to the drinking side, the ease with which the contents come out can be improved. (2) In the case of a single opening having a long circumference (second means) In view of the ease of processing and the strength of the top plate (panel) after processing, the drinking mouth is, for example, as shown in FIG. It is preferable that the opening is constituted by one opening. If the air vent is provided, the ease with which the contents come out can be improved.

[0022]

Since the present invention is constructed as described above, it has various effects as described below. In the unlikely event that a small hole is opened in the lid material due to mischief with a syringe or the like, the present invention is a positive pressure can. Therefore, for example, carbonic acid of the beverage (contents) escapes from the hole, and in particular, the positive pressure can is made of aluminum. In the case of a can, the can body is dented, so that it can be recognized that the mischief has occurred. There is no need for complicated processing of rivets and scores on the top plate (panel) and processing of the complicated tab itself as in the conventional case. The consumer can remove the lid and open the mouth, so that the contents can be taken from the clean mouth. By advertising the lid material (opening seal) attached to the top plate by, for example, gravure printing, a can lid having a high advertising effect can be obtained. By covering the entire surface of the top plate with the lid material and partially adhering the top plate, a wide advertising area can be obtained while maintaining easy opening. The easy opening property is further improved by attaching the lid member so as to partially cover only the drinking port and the air port. By making the adhesive strength of the peeling end of the lid material larger than the adhesive strength of the peeling start end,
The lid material can be left on the can lid at the peeling end portion to prevent scattering of dust by the lid material.

[Brief description of drawings]

1A and 1B are a plan view and a longitudinal sectional view of an embodiment of a heat-sealing can lid of a positive pressure can according to the present invention.

FIG. 2 is an upper sectional view of the positive pressure can of the present invention.

FIG. 3 is an enlarged cross-sectional view of the heat seal shown in FIGS. 1 and 2.

FIG. 4 is a diagram for explaining the relationship between the internal pressure of a can and the area and circumference of a drinking spout.

FIG. 5 is a plan view showing a second embodiment of the heat seal can lid of the positive pressure can according to the present invention.

FIG. 6 is a plan view showing a third embodiment of the heat seal can lid of the positive pressure can according to the present invention.

FIG. 7 is a diagram showing a modification of FIG.

FIG. 8 is a plan view showing an example of a conventional can lid.

9 is a view of the can lid of FIG. 8 viewed from the back side.

[Explanation of symbols]

 11,100,300,400 Heat seal can lid 11a Positive pressure can 11b Body (can body) 12 Winding tightening portion 13 Outer peripheral groove 14 Top plate (panel) 15,20 Lid material (opening seal) 15a Polyester film 15b Printing layer 15c Aluminum foil (base material) 15d Adhesive layer 15e Sealant 16,21,26,31 Drinking mouth 17 Handle 18 Strong adhesive part 22 Wall surface 24,28,33 Air port 27,29,32,34 Small hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Katayama 2-3-3 Shiba, Minato-ku, Tokyo, within ME Packaging Co., Ltd. (72) Inventor Daikichi Obama 520 Imazato, Susono-shi, Shizuoka Prefecture M Co., Ltd. A packaging inside the Susono Plant

Claims (8)

[Claims] 1. A can body and a can lid that is attached to the can body by tightening the can body. The top plate of the can lid is provided with a drinking port, and the top plate covers the drinking port. for,
A positive pressure can, wherein a lid material including a base material and a sealant is adhered by heat sealing. 2. The positive pressure can according to claim 1, wherein the drinking spout comprises a plurality of small holes. 3. The positive pressure can according to claim 1, wherein the can body and the can lid are made of the same material. 4. The air vent is formed on the opposite side of the top plate from the drinking mouth, and the air vent is also closed by the lid member. Positive pressure can. 5. The positive pressure can according to claim 1, wherein the peeling end portion of the lid member has an adhesive strength higher than that of a peeling start end portion. 6. The positive pressure can according to claim 1, wherein the lid member is attached so as to cover substantially the entire surface of the top plate. 7. The sun according to any one of claims 1 to 5, wherein the lid member is partially attached to the top plate so as to cover only the drinking port and the air port. Pressure can. 8. A top plate of a can lid is provided with a drinking port, and a lid member having a base material and a sealant for covering the drinking port is adhered to the top plate by heat sealing. A heat-seal can lid characterized by.