JP4799725B2 - Packaging container - Google Patents

Description

【００２９】
【表２】

【００３０】
【表３】

【００３１】
表１〜３は、ハーフカット領域幅(＝易湾曲帯状領域幅)とハーフカット間隔とを変化させた複数枚の蓋体を用意して実験した結果を示している。表１の実験では、ハーフカットは、図６中符号23'で示される方を採用した。表２及び表３の実験では、ハーフカットを蓋体の略中間部からつまみ部基部まで施した蓋体を用いて行った結果を示している。そして、表２では、図６中符号23'で示される方のハーフカットを、また、表３では、図６中符号23で示される方のハーフカットを採用した。表中の矢印はハーフカットの施されている領域を示している。表２、３中、PET12は12μ厚みのポリエステル層、PE20は20μ厚みのポリエチレン層、PR20は20μ厚みのイージーピール性を有する熱接着性プラスチック層、EMAA20は20μ厚みのエチレン−メタアクリル酸共重合体層を意味している。
【００３２】
前記したように、即席麺用包装容器の場合は、蓋体の開封後に湯を注ぐ関係で、蓋体の開口高さが高い程都合がよい。この観点から見ると、ハーフカット領域の幅は、表１からわかるように、小さ過ぎるのも大きすぎるのも不適当であって、30mm程度の幅寸法が最適であり、その幅寸法の範囲内では、ハーフカット間隔が2.5〜10.0mmの範囲が好適である。ただし、ハーフカット間隔が2.5〜5.0の程度の場合は、蓋体の表裏に凹凸が目立つ傾向があるので、ハーフカット間隔は、結局、5.0〜10.00mmが好ましい。
【図面の簡単な説明】
【図１】 従来の包装容器を示す斜視図である。
【図２】 図１の包装容器の蓋体を一部開封して、湯を注いでいる状態を示す斜視図である。
【図３】 図１の蓋体の積層構造を示す要部断面図である。
【図４】 図１の蓋体の易湾曲領域を押罫で構成してなる従来例を示す要部断面図である。
【図５】 本発明の１実施形態に係る蓋体の裏面図である。
【図６】 図５の蓋体の積層構造を示す要部断面図である。
【図７】 蓋体を一部開封したときの、蓋体の開口高さを示す説明図である。
【図８】 実験要領を示す説明図である。
【符号の説明】
１ 容器本体
２ 蓋体
2a 紙層
2b 接着層
2c アルミ箔層
2d ヒートシール性プラスチック層
2e プラスチック基材層
2f 押罫
2g 上周面
2h 圧縮部
2j 遮光層
21 円形本体部
22 つまみ部
23,23' ハーフカット罫
24 易湾曲帯状領域
24a 易湾曲帯状領域の反つまみ部側領域最端部
25 ヒートシール部
26 ハンド
27 接着テープ
h 開口高さ
C 中心線[0001]
BACKGROUND OF THE INVENTION
The present invention generally relates to a packaging container, and in particular, in use, partially opens the lid, pours hot water into the container body, and then returns the lid to the original closed position to steam the contents. The present invention relates to packaging containers such as instant noodles. More specifically, the present invention comprises a container body having a circular opening on the upper surface, a sheet-like circular lid that closes the opening of the container body and does not include a metal layer in the laminated structure, and the lid The present invention relates to a packaging container in which the peripheral part of the back surface of the body is heat-sealed to the upper peripheral surface that forms the opening of the container body, and in particular, when the lid is partially opened, its curvature is not included even though the metal layer is not included. The present invention relates to a packaging container improved so that the unsealed state is maintained relatively well.
[0002]
[Prior art]
FIG. 1 shows a packaging container for instant noodles. As is well known, after this type of packaging container is filled with instant noodles and condiments in the container body 1, the lid 2 is formed on the upper peripheral surface 2g (see FIG. 2) forming the upper opening of the container body. Heat sealed. As shown in FIG. 3, the lid generally has a laminated structure including a paper layer 2a, an adhesive layer 2b, an aluminum foil layer 2c, and a heat seal layer 2d. In this laminated structure, the aluminum foil layer has a function of imparting shape retention to the lid. That is, in the manufacturing factory, this aluminum foil layer maintains the flatness of the individual lids stacked 100 or more, and when the product is used, it is partially opened when pouring hot water into the container body. The curved open state of the lid is maintained (see FIG. 2).
[0003]
However, since this packaging container includes an aluminum foil layer, that is, a metal layer as a material, in the laminated structure of the lid, metal detection for inspecting a metal foreign object that may be erroneously mixed in the container of the finished product. There is a problem that the vessel cannot be used. In addition, there is a problem that aluminum adheres to the incinerator when the used packaging container is incinerated.
[0004]
In order to solve such a problem, it is necessary to remove the aluminum foil layer from the laminated structure of the lid. Conventionally, in this type of packaging container, a plastic substrate layer is used as an alternative to the aluminum foil layer, and as shown in FIG. 4, the back surface of the lid is formed by embossing with a blade (blade). (Linear concave groove) 2f or perforation that penetrates the front and back sides, and when the lid is partially opened, an improvement plan is also devised so that the lid bends at this ruled part or perforation (Refer to JP-A-10-329868)
However, according to this improved plan, unevenness appears not only on the back surface but also on the front surface due to embossing. As a result, if 100 or more lids are stacked during the manufacturing process, the space between adjacent lids is not stable. Therefore, the operation such as the process of punching the embossed lid blank into a circle is hindered.
[0005]
On the other hand, in the case of a perforation, there is a separate problem that the smell of an object in the container leaks through the perforation.
[0006]
By the way, as shown in FIG. 2, while pouring hot water into the container body 2, even if the curved open state of the lid 2 that is partially opened and curved is released from the knob portion of the temporary lid, Is preferably maintained. Therefore, the shape retention property that maintains the curved shape of the lid in the opened state is extremely important.
[0007]
Conventional packaging containers have included an aluminum foil layer in the laminated structure, so there was no problem in shape retention. However, in the case of a lid that lacks a metal layer such as an aluminum foil layer, it must be devised to give its shape retention.
[0008]
[Problems to be solved by the invention]
Therefore, the technical problem to be solved by the present invention is that this type of packaging container does not include a metal layer such as an aluminum foil layer in the laminated structure of the lid body, and the flatness in the manufacturing process, and the time of use. Provided is a structure that is excellent in shape retention for maintaining a curved opening shape, has no conspicuous irregularities on the front and back surfaces, and does not have a through-hole penetrating the lid body on the front and back like a perforation. It is in.
[0009]
[Means and effects for solving the problems]
In order to solve the above problems, a packaging container according to the present invention has the following configuration.
[0010]
The general configuration of the packaging container itself is the same as that of the conventional example, and is composed of a container body having a circular opening on the upper surface and a sheet-like circular lid that closes the opening of the container body. The structure is such that heat sealing is performed on the upper peripheral surface forming the opening of the container body. The lid of the packaging container is formed by laminating at least a paper layer, a plastic base material layer, and a heat-sealable plastic layer in order from the front side, and at least at a substantially intermediate portion in the opening direction, a direction orthogonal to the opening direction. It has an easily-curved belt-like region extending in the direction. A plurality of parallel half-cut rules penetrating the plastic base material layer are formed in the easily curved belt-like region.
[0011]
Unlike conventional perforations, half-cut creases do not have through holes in the lid, so the scent of the contents in the packaging container hardly leaks to the outside, and the perforations are similar to perforations. Is not too weak and is not too strong like a ruled line. Therefore, as will be apparent from the examples described later, when the lid is partially opened and curved at the time of use, the curved opened state is favorably maintained. Of course, since the plastic base material layer is included in the laminated structure of the lid, the flatness can be maintained in the manufacturing process as long as no special external force is applied.
[0012]
The said structure WHEREIN: It is preferable that the both ends of each said half cut ruled line formed in the said bendable belt-like area | region of a cover body are terminated inside the ring-shaped heat seal part of a cover body. When opening a part of the lid in use, a large shearing force acts on the peripheral part of the lid, that is, the circular peripheral part heat-sealed to the container body. There is a risk of tearing. In particular, in the conventional example employing a perforation, since the perforation is formed to the outer periphery of the lid, there is a disadvantage that it is easy to break, and at the same time, the paper layer peels off from the lower layer on the side opposite to the perforating portion of the perforation. As a result, the lid body could not be completely removed from the container main body, and the lower layer remained in the container main body. However, as in the present invention, by terminating both ends of each half cut inside the outer periphery of the lid, problems such as tearing of the lid at the time of partial opening can be prevented.
[0013]
The present invention can be suitably applied to a conventional typical instant noodle packaging container. The diameter of the lid of a conventional typical instant noodle packaging container is 80 to 120 mm. In this case, it is preferable that the distance between the half-cut rules is in the range of 5.0 to 10 mm. In addition, the width dimension of the easily curved belt-like region is usually in a range of 20 to 40 mm, but may extend from the substantially intermediate portion to a knob base that is a lid opening start portion. Furthermore, the counter-knob portion side end of the easy-bending band-like region of the lid is preferably within 10 mm from the center line of the lid, and preferably has at least three half-cut rules.
[0014]
As is clear from the experimental results described later, the dimensional configuration and the number configuration in the above range maintain the shape retaining property of the lid well, and the concave and convex shape on the lid surface due to the half-cut. However, it is in a range that does not hinder the appearance. If the interval size of the half cut is too small, the uneven shape is conspicuous, which causes a problem in appearance. Moreover, if the width dimension of the easily-curved belt-like region is too small, it cannot be greatly bent, so that it easily returns to the original shape.
[0015]
Each half-cut ruled line that penetrates the plastic substrate layer may be covered with a heat-sealable plastic layer. In this configuration, the half cut, which is a kind of passage formed in the lid, is covered with the paper layer on the front side and the heat-sealable plastic layer on the back side, so even if the smell of the contents is tight, the lid Unless it is opened, the leakage of odors to the outside is completely prevented. However, if the scent of the contents is normal, even if each half cut further penetrates the heat-sealable plastic layer, the problem of scent leakage hardly arises.
[0016]
In addition, when a light shielding layer is laminated between the paper layer and the plastic base material layer, external light transmitted through the paper layer can be completely blocked, so that there is an advantage that deterioration of contents can be effectively prevented.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0018]
The overall shape of the packaging container according to this embodiment is the same as that of FIG. 1 described as a conventional example, and is a container body 1 having a circular opening on the upper surface, and a sheet-like circle that closes the opening of the container body 1. It consists of a lid 2. The lid 2 is adhered to the container body by heat-sealing the peripheral portion of the back surface to the upper peripheral surface that forms the opening of the container body 1.
[0019]
The back surface of the sheet-like circular lid 2 is shown in FIG. The lid includes a circular main body 21 that is bonded to the upper peripheral surface 2g of the container main body and covers the container main body, and a knob 22 that extends outward from the circular main body. As shown in FIG. 6, the lid has a laminated structure formed by laminating a plurality of layers. In this laminated structure, a paper layer 2a, a light shielding layer 2j printed on the back surface of the paper layer, an adhesive layer 2b, a plastic substrate layer 2e, and a heat-sealable plastic layer 2d are laminated in order from the front side.
[0020]
As shown in FIG. 5, the lid 2 has an easily curved belt-like region 24 extending in a direction orthogonal to the opening direction in a substantially intermediate portion in the opening direction, that is, in the diameter direction passing through the knob portion 22.
[0021]
This easily curved belt-like region 24 is formed with a plurality of parallel half-cut ruled lines 23 penetrating the plastic base material layer 2e and substantially reaching the back surface of the paper layer 2a as shown in FIG. Since this half-cut ruled line 23 is covered with the heat-sealable plastic layer 2d, it is not exposed on either the front surface or the back surface. As a modification of the half-cut rule, the half-cut rule 23 ′ shown in FIG. 6 may be used. This half-cut ruled line 23 'penetrates not only the plastic substrate layer 2e but also the heat-sealable plastic layer 2d. Half-cut ruled lines are more likely to bend at 23 'than at 23.
[0022]
Both ends of each half-cut ruled line 23 formed in the easily-curved belt-like region 24 terminate inside the outer periphery of the lid, specifically, before the ring-shaped circular heat seal portion 25.
[0023]
The diameter dimension of the lid of the packaging container according to the present embodiment is a typical conventional dimension, and specifically, is in the range of 80 to 120 mm. And although the width dimension of the said easily curved belt-like area | region 24 is normally comprised in the range of 20-40 mm, you may extend to the base of the knob part 22, ie, the front of the ring-shaped heat seal part 25. . It is preferable that the counter-knob portion side region end 24a of the easy-curved belt-like region 24 of the lid is within 10 mm from the center line C of the lid. If the lid is opened too much during pouring, the gap between the lid and the container body will be large when the lid is closed again, which is inconvenient for steaming purposes. For this reason, as a measure of the degree of opening of the lid, it is preferable that the shortest portion 24a on the side opposite to the knob portion of the easily bent belt-like region is within the above range, and it is not necessary to increase it further.
[0024]
The distance between the half-cut rules is preferably in the range of 5.0 to 10 mm. If it is the space | interval dimension of this range, the conspicuous unevenness | corrugation on the front and back of a cover body will not be formed. According to this dimensional configuration, as will be clarified in the examples described later, the curved unsealed state at the time of lid opening can be well maintained, and as a result, the opening height of the lid at the time of pouring can be reduced. It can be kept large. The number of half-cut rules formed in the easily curved belt-like region is required to be at least three. If it is 2 or less, it is difficult to bend gently.
[0025]
In the above embodiment, since the light shielding layer 2j is laminated between the paper layer 2a and the plastic substrate layer 2e, even if the paper layer 2a has some translucency, the light shielding layer 2j The light is completely blocked and the contents can be prevented from deteriorating.
[0026]
【Example】
The present inventor conducted an experiment as to where it is effective to form the easily-curved belt-like region 24, and how much the half-cut ruled line 23 is appropriate at what interval. As a result, the results shown in Tables 1 to 3 were obtained.
[0027]
Experimental method An experiment was conducted by preparing a substantially cylindrical packaging container for instant noodles having a lid with a diameter of 96 mm. As shown in FIG. 8, the experiment method is as follows. One end of the adhesive tape 27 is attached to the knob portion 22 of the lid 2 and the other end is held by the hand 26 of the tensioning device, and the hand 26 is moved at a constant speed (300 mm / min). It was moved diagonally backward and opened about half.
[0028]
Experimental results [Table 1]

[0029]
[Table 2]

[0030]
[Table 3]

[0031]
Tables 1 to 3 show the results of experiments performed by preparing a plurality of lids in which the half-cut region width (= easy-curved belt-like region width) and the half-cut interval are changed. In the experiment of Table 1, the half-cut method indicated by reference numeral 23 'in FIG. 6 was adopted. In the experiment of Table 2 and Table 3, the result of having performed using the cover body which gave the half cut from the substantially middle part of the cover body to the knob part base was shown. In Table 2, the half-cut indicated by reference numeral 23 ′ in FIG. 6 was adopted, and in Table 3, the half-cut indicated by reference numeral 23 in FIG. 6 was adopted. The arrow in the table indicates a region where a half cut is applied. In Tables 2 and 3, PET12 is a 12μ thick polyester layer, PE20 is a 20μ thick polyethylene layer, PR20 is a 20μ thick easy-adhesive heat-adhesive plastic layer, and EMAA20 is a 20μ thick ethylene-methacrylic acid copolymer. Means a combined layer.
[0032]
As described above, in the case of an instant noodle packaging container, the higher the opening height of the lid body, the more convenient it is because pouring hot water after the lid body is opened. From this point of view, as can be seen from Table 1, the width of the half-cut area is too small or too large, and a width of about 30 mm is optimal. Then, the range where the half-cut interval is 2.5 to 10.0 mm is preferable. However, when the half-cut interval is about 2.5 to 5.0, unevenness tends to be conspicuous on the front and back of the lid, so the half-cut interval is preferably 5.0 to 10.0 mm after all.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a conventional packaging container.
FIG. 2 is a perspective view showing a state in which a part of the lid of the packaging container of FIG. 1 is opened and hot water is poured.
3 is a cross-sectional view of a main part showing a laminated structure of the lid of FIG.
4 is a cross-sectional view of the main part showing a conventional example in which the easy-bending region of the lid shown in FIG.
FIG. 5 is a rear view of the lid according to the embodiment of the present invention.
6 is a cross-sectional view of a main part showing a laminated structure of the lid body of FIG. 5;
FIG. 7 is an explanatory view showing the opening height of the lid when the lid is partially opened.
FIG. 8 is an explanatory diagram showing an experimental procedure.
[Explanation of symbols]
1 Container body 2 Lid
2a Paper layer
2b adhesive layer
2c Aluminum foil layer
2d heat sealable plastic layer
2e Plastic base layer
2f Ruled line
2g Top circumference
2h Compression unit
2j shading layer
21 Circular body
22 Knob
23,23 'half-cut ruled line
24 Easy curve zone
24a The end of the area on the side opposite to the knob of the easy-bending band
25 Heat seal part
26 hands
27 Adhesive tape
h Opening height
C center line

Claims (6)

The container main body (1) having a circular opening on the upper surface and a sheet-like circular lid (2) for closing the opening of the container main body, and the opening around the back surface of the lid form the opening of the container main body. In a packaging container that is heat sealed to the upper peripheral surface,
The lid (2) is formed by laminating at least a paper layer (2a), a plastic substrate layer (2e), and a heat-sealable plastic layer (2d) in order from the front side, and at least in a substantially middle part in the opening direction. , Having an easily curved belt-like region (24) extending in a direction orthogonal to the opening direction,
In the easily curved belt-like region (24), a plurality of parallel half-cut rules (23) penetrating the plastic substrate layer (2e ) are formed,
Both ends of each half-cut ruled line (23) formed in the easily bendable belt-like region (24) of the lid (2) terminates inside the ring-shaped heat seal part (25) of the lid (2). and,
Each of the half cut rules (23) of the lid (2) is covered with a heat-sealable plastic layer (2d) . 2. A packaging container according to claim 1, wherein the lid (2) has a diameter of 80 to 120 mm, and a distance between the half-cut creases (23) of 5.0 to 10.0 mm.   The diameter of the lid (2) is 80 to 120 mm, and the width of the bendable band region (24) formed on the lid is 20 to 40 mm. Packaging containers.   3. The packaging according to claim 1 or 2, wherein the easily curved belt-like region (24) of the lid (2) is a region from the substantially intermediate portion to a knob base which is a lid opening start portion. container. The end portion (24a) of the lid portion (2) on the side opposite to the knob portion of the easy-bending belt-like region (24) is within 10 mm from the center line (C) of the lid body, and the half-cut ruled line (23) is at least The packaging container according to claim 1, wherein the number is three. The packaging container according to claim 1, wherein a light shielding layer (2j) is laminated between the paper layer (2a) and the plastic substrate layer (2e).

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