JP2913038B2 - Container - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a container used for packaging foods and the like. [Prior art] Conventionally, for packaging foods and the like, a container having a container body having a flange portion and a lid has been frequently used, and the container is filled with contents in the container body, Although the lid is tightly sealed to the container body by sealing tightly, if the sealing strength is increased to increase the sealing property, there is a disadvantage that the opening property is poor. Therefore, in this type of container, it is desired that the container be simultaneously sealed and opened. Also, in this type of container, there is an increasing demand for mounting the lid of the container once opened on the container body again. For this reason, the applicant of the present invention has designed a container that satisfies not only the sealing property but also the opening property so that the interlayer adhesive strength of the lid material (lid body) having a multilayer structure is smaller than the adhesive strength between the flange portion and the lid material. In addition, an easy-opening container is proposed in which a non-sealing portion is provided on a flange portion inside the sealing portion and a cutting line is provided on an inner layer of the lid material on the non-sealing portion (Japanese Patent Application No. 61-229594).
This principle was also applied to a drop lid and an easily-openable container using the same (Japanese Patent Application No. 62-42794). Further, as well as tightly sealing the injection molded outer lid to the flange portion of the container body as a conventional example, heat sealing the inner lid made of a gas barrier film inside the container, and opening the outer lid in a pull-top manner. Containers that are resealed by fitting are known. [Problems to be Solved by the Invention] However, in the above-mentioned container proposed by the present applicant, the technical idea of reattaching the lid to the container body is not disclosed, so that once the container is opened, In order to preserve the contents, there is a problem that the container body must be separately covered with a wrap or the like. In addition, the fitting container has a problem that the opening is complicated due to the double lid type, the structure of the container is complicated, and the two-stage seal must be performed, so that the sealing is difficult. Here, an object of the present invention is that the lid can be easily opened, and the lid can be reattached to the container main body.
An object of the present invention is to provide a container which can reliably seal the container body and the lid even when pressure is applied to the inside during sealing. [Means for Solving the Problems] The present invention relates to a container having a container body having a flange portion and a lid body that is melt-sealed with the flange portion,
At least one of the container body and the lid has a multilayer structure including a first layer portion facing the other of the container body and the lid, and a second layer portion which is releasably polymerized with the first layer portion. The peel strength of the enabled multilayer structure is formed so as to be smaller than the adhesive force of the seal portion between the flange portion and the lid, and the peel strength is not closer to the center of the container than the seal portion between the lid and the flange. In addition to forming a seal portion, a cut is formed in the first layer portion of the peelable multilayer structure facing the non-seal portion, and the lid and the container main body are provided with a cover with respect to the container main body. A fitting portion to be removably fitted is formed closer to the center of the container than the flange portion, and the fitting portion is a concave portion formed in one of the container body and the lid, the container body, and the lid. And a projection formed on one of the two sides. It is intended to achieve. [Operation] To open the container of the present invention thus configured,
A boundary surface between the first layer portion and the second layer portion formed on at least one of the container body and the lid tightly sealed to each other is peeled from the outside of the container toward the center. And the container body. In order to reattach the lid to the container body, the lid is pressed against the container body until the lid and the container body are fitted at the fitting portion. Furthermore, since the fitting portion is formed closer to the center of the container than the flange portion, even if pressure is applied to the inside of the container when sealing the lid to the container body, this pressure can be suppressed by the fitting portion. . Accordingly, the pressure applied to the inside of the container does not cause the flange to be displaced from the lid, so that the sealing between the container body and the lid at the flange can be reliably performed. Embodiment An embodiment of the present invention will be described below with reference to the drawings. Here, in each embodiment, the same or similar components are denoted by the same reference numerals, and description thereof will be omitted or simplified. FIG. 1 shows a state in which the first embodiment of the present invention is sealed, and FIG. 2 shows a state in which the first embodiment is opened. In these figures, a container 10 of the present embodiment has a bottomed cylindrical container body 11 having a flanged portion 11A with ribs, and a predetermined length from the periphery toward the center of the container.
A and a drop lid type lid body 12 which is melt-sealed. Seal portion 1 between the flange portion 11A and the lid 12
3, seal strength is more than 1000g / 15mm, preferably 1500g / 15m
m or more. At this time, the seal portion 13 is formed by an appropriate method such as ultrasonic wave, electromagnetic wave, high-frequency bonding, impulse, or a hot plate, but the lid 12 is relatively thick. Taking into consideration that, for example, the effect of eliminating contaminants on the seal portion 13,
An ultrasonic wave is preferred. The material forming the container body 11 is not particularly limited,
For example, polyolefin resin, polystyrene resin,
Polyamide-based resin, polyester-based resin, ethylene-vinyl alcohol copolymer, polyacrylonitrile, polyvinylidene chloride resin, resin mixed with 5 to 70% by weight of inorganic filler, or a single layer mixed with these different resins,
Or formed by a multi-layered composite of these, or formed by laminating a film sheet made of these resins and paper, a metal substrate such as aluminum foil, as the resin, a gas barrier resin layer Are preferred. Further, it may be formed of a single layer made of a metal such as aluminum or a multi-layered material with a resin. If necessary, the resin may be blended with a thermoplastic elastomer, a modified polyolefin modified with an unsaturated carboxylic acid or a derivative thereof, and various additives. The molding of the container body 11 is performed by a commonly used method such as thermoforming from a sheet, injection molding, injection blow molding, drawing and press molding. The lid 12 has two layers of a first layer (inner layer) 12A facing the container body 11 and a second layer (outer layer) 12B which is releasably polymerized on the first layer 12A. Formed, the interlayer adhesive strength, that is, the delamination strength, is 300 to 2000 g / 15 m
m, preferably 400 to 1500 g / 15 mm, and the flange portion
The adhesive strength of the seal portion 13 between the lid 11A and the lid 11A is made smaller. These interlayer adhesive strengths can be appropriately determined depending on the purpose of use by combining various resins or blending resins in which the mixing ratio of the resins is adjusted in consideration of the type and thickness of the resin of the release layer. In addition, by making the peeling layer sticky, the resealability can be more completely improved. Further, the first layer portion 12
A, the second layer portion 12B may be a single layer or two or more layers.
However, when the first layer portion 12A has a plurality of layers, in order to peel the first layer portion 12A and the second layer portion 12B for opening the container 10, the first layer portion 12A needs to be removed from the interlayer adhesive force of the first layer portion 12A. It is necessary to reduce the adhesive strength between the first layer portion 12A and the second layer portion 12B. Here, the material for forming the lid 12 is not particularly limited, and the same material as the container main body 11 is used. As the resin used, polyolefin resin, polystyrene resin, polyamide resin, polyester resin, ethylene-vinyl alcohol copolymer, polyacrylonitrile,
Polyvinylidene chloride resin and the like are raised, and among them, those having a gas barrier resin layer are preferable. In addition, the lid
The thickness of 12 is at least 200 μm, preferably at least 300 μm, and is at least ５ of the thickness of the flange 11A, preferably at least ２ of the thickness of the flange 11A. A non-seal portion 15 is formed on the container center side of the seal portion 13 between the lid 12 and the flange portion 11A and communicates with the storage portion 14 at the center of the container, and a lid facing the non-seal portion 15 is formed. A cut 16 is formed in the first layer portion 12A of the body 12 at a distance T from the inner edge of the seal portion 13. This cut 16
It is formed continuously around the entire circumference along a circular locus about the axis of the container body 11, or intermittently like a perforation, and the depth is the same as that of the first layer portion 12A. 2 layers 1
It is formed to reach the interface with 2B. The cut 16 is formed when the lid 12 is peeled off.
It is only necessary that the first layer portion 12A can be cut, and a preferred embodiment is one that reaches the boundary surface between the first and second layer portions 12A and 12B, but does not completely reach the boundary surface as long as the purpose is achieved. Does not exclude. Further, the notch 16 of the lid 12 is provided.
A notch 17 concentric with the cut 16 is formed further outside and near the periphery of the second layer portion 12B, and the tip of the notch 17 reaches the boundary between the first layer portion 12A and the second layer portion 12B. Is formed. Further, a tab 18 for detaching the lid 12 from the container body 11 is attached to the inside of the notch 17 of the lid 12, and the tab 18 is formed by injection molding from a resin such as polypropylene. I have. On the container center side from the flange portion 11A of the lid 12 and the container main body 11, a convex portion 21 formed along the outer periphery of the lid 12 and an inner periphery of the container main body 11 are formed and the convex portion is formed. Department
A fitting portion 20 including a concave portion 22 detachably fitted to 21 is formed. The fitting portion 20 is formed by the container body 11 and the lid.
It is formed over the entire circumference of 12 or on a part of its peripheral surface. In such a configuration, the container main body 11 and the lid 12 of the container 10 of the first embodiment are separately formed, and after the contents are filled in the container main body 11, the container main body 11 and the lid 12 are closed. The container 10 is hermetically sealed by forming a seal portion 13 by ultrasonic waves or the like. In the sealed container 10, pressure is applied to the inside when heat treatment or the like is performed. However, since this pressure is concentrated mainly on the inner edge of the seal portion 13 having a dimension T away from the cut 16, the cover 16
The first layer portion 12A and the second layer portion 12B of 12 are not separated. Here, the dimension of T is 0.5 mm or more, usually 1 to 5 mm. When the tab 18 is pulled to open the container 10, the space between the first layer portion 12A and the second layer portion 12B of the lid 12 is separated from the notch 17 toward the center of the container, and the separation further proceeds. And reach up to 16 infeeds. When the tab 18 is further pulled, the container body 11 and the lid 12 are peeled off over their entire circumference. At this time, the fitting part 20 is configured such that the multilayer lid 12 is
, The engagement between the concave portion 22 and the convex portion 21 is released. Further, if the lid 12 of the container 10 that has been opened once is pushed into the container main body 11 until the concave portion 22 and the convex portion 21 are engaged, the lid 12 is mounted on the container main body 11 again. According to the first embodiment, the container body 11 and the lid 12
By completely sealing with
The container 12 can be easily opened simply by peeling off the lid 12 from the container body 11, and since the fitting portion 20 is provided in the container 10, the lid 12 of the container 10 once opened can be re-attached to the container body 11. Can be installed. In addition, since the container body 11 and the lid 12 are sealed in only one stage, the sealing operation can be performed on the container and the structure of the container 10 can be simplified. Further, according to the first embodiment, the thickness of the lid 12 is more than one-fifth of the thickness of the flange portion 11A of the container body 11, that is, the thickness of the lid 1
Since the thickness of 2 is relatively thick, the rigidity of the lid 12 can be ensured, so that the cut 16 can be easily formed, and the lid 12 can be reliably peeled off from the container body 11. Furthermore, since the fitting portion 20 is formed closer to the center of the container than the flange portion 11A, even when pressure is applied to the inside of the container when the lid 12 is sealed to the container body 11, this pressure is applied to the fitting portion. 20 can be suppressed. Therefore, the pressure applied to the inside of the container does not cause the flange portion 11A to be displaced from the lid 12,
The sealing between the container body 11 and the lid 12 at the flange portion 11A can be reliably performed. Next, in order to confirm the effect of the first embodiment, the experimental example was changed to the third.
This will be described with reference to the drawings. Container body 11 Material: High-density polyethylene (Idemitsu Polyethylene 440M, manufactured by Idemitsu Petrochemical Co., Ltd.) (hereinafter A), polypropylene (B), maleic anhydride-displaced polypropylene [Idemitsu Polytac E-100, manufactured by Idemitsu Petrochemical Co., Ltd.] ] (C), saponified ethylene-vinyl acetate copolymer [EVAL EP-F101
(D), maleic anhydride-dispersed polypropylene [Idemitsu Polytac E-100] (E), and polypropylene (F) as shown in FIG.
(A) to (F) are formed into a sheet by co-extrusion in the arrangement state, and their thicknesses are A = 70 μm, B = 330 μm,
C = 20 μm, D = 30 μm, E = 20 μm, F = 330 μm,
The total thickness was 800 μm. In addition, polypropylene (B) and (F) are polypropylene [Idemitsu Polypropylene E-
100G Idemitsu Petrochemical Co., Ltd.), high-density polyethylene [Idemitsu Polyethylene 440M], low-density polyethylene [Petrocene 172, manufactured by Toyo Soda Kogyo Co., Ltd.] at a weight ratio of 80/15/5. Using. Shape: A container body with a rib having a fitting portion with a diameter of 80 mm and a depth of 40 mm was formed by a commonly used method. At this time, the high-density polyethylene (A) was set inside the container, and the polypropylene (F) was set outside the container. Lid 12 material; second layer 12B: polypropylene (G), maleic anhydride-displaced polypropylene [Idemitsu Polytac E-100]
(H), saponified ethylene-vinyl acetate copolymer [EVAL EP-E101] (I), maleic anhydride-displaced polypropylene [Idemitsu Polytac E-100] (J), polypropylene (K), first layer 12A: High-density polyethylene (L) As shown in FIG.
(G) to (L) are formed into a sheet by co-extrusion in a state of arrangement, and these thicknesses are G = 100 μm, H = 20 μm,
I = 30 μm, J = 20 μm, K = 280 μm, L = 50 μm,
The total thickness was 500 μm. In addition, polypropylene (G) and (K) are polypropylene [Idemitsu Polypropylene E-
100G), 80/20 low density polyethylene (Petrocene 172)
Used in a ratio of 1% by weight. Shape; diameter that can be fitted to the container body 11 by a commonly used method
A drop lid 12 having a diameter of 78 mm was formed. At this time, the high-density polyethylene (G) was set outside the container, and the polypropylene (K) was set inside the container. Cut 16: An annular shape having a depth of 60 μm was formed in the first layer portion 12A of the lid 12. Sealing part 14: The lid 12 was fitted into the container body 11, and a horn was applied to the lid 12 to seal the outside of the cut 16 by 1 mm from the cut 16 with an ultrasonic wave. Tab 18 was molded by injection molding using polypropylene (Idemitsu Polypro J-750H, manufactured by Idemitsu Petrochemical Co., Ltd.). The tab 18 was attached to the lid 12 by an ultrasonic seal. The container 10 manufactured in this manner includes a tab 18 with a lid 12.
Can be easily opened by pulling in the direction of 90 degrees. After opening, the lid 12 could be reattached to the container body 11. In each of the above embodiments, the flange 11
Although the rib is formed on A, in the present invention, a curling may be formed on the flange portion 11A of the container body 11, or a flat shape may be formed without forming anything on the flange portion 11A. In each embodiment, if the first layer portion 12A and the second layer portion 12B can be peeled off at the periphery of the lid 12, the notches 17, 25 need not necessarily be formed. Furthermore, the formation of the first layer portion and the second layer portion, and the formation of the cut 16 in the first layer portion is not limited to the lid, and only the container body, or the lid and Both of the container bodies may be used. The cut 16 may be formed along the entire periphery of the lid 12 or may be formed only partially, that is, formed in an arc shape. Further, the shape of the container main body 11 may be a cup type, a tray type, or the like, and further, the cross-sectional shape may be a circle, a triangle, a polygon such as a quadrangle, or the like. Such a thing may be used. The fitting portion 20 includes a concave portion formed along the outer periphery of the lid 12 and a convex portion formed along the inner periphery of the container body 11 and removably fitted to the concave portion. You may. [Effects of the Invention] According to the present invention as described above, the lid can be easily opened, and the lid can be reattached to the container main body. There is an effect that the lid can be securely sealed.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are cross-sectional views of a first embodiment of the present invention. FIG. 1 shows a sealed state of a container, FIG. 2 shows an opened state of the container, respectively. FIGS. 3 (X) and (Y) are views showing the arrangement of the resin of the container body and the lid. 10 ... container, 11 ... container body, 11A ... flange part, 12
... lid, 12A ... first layer part, 12B ... second layer part, 13 ...
Seal part, 15: Non-seal part, 16: Cut, 20: Fitting part.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-236634 (JP, A) JP-A-63-110108 (JP, A) Fully open Sho57-159652 (JP, U) Really open Showa 64- 20484 (JP, U) Jiko 58-58223 (JP, Y2) Jiko 44-7736 (JP, Y1) (58) Fields investigated (Int. Cl. ⁶ , DB name) B65D 1/00-1 / 48 B65D 35/44-35/54 B65D 39/00-55/16 B65D 67/00-79/02 B65D 81/18-81/30 B65D 81/38 B65D 81/32-81/36 B65D 85/50 -85/56 B65D 85/60 B65D 85/72-85/84 B32B 1/00-35/00

Claims (1)

(57) [Claims] In a container including a container body having a flange portion and a lid that is melt-sealed with the flange portion, a first layer in which at least one of the container body and the lid faces the other of the container body and the lid And a first layer portion and a second layer portion that is releasably polymerized. The peel strength of the releasable multilayer structure is determined by the adhesive strength of the seal portion between the flange portion and the lid. And a non-seal portion on the container center side from the seal portion between the lid and the flange portion, and the peelable multilayer facing the non-seal portion. A notch is formed in the first layer portion of the structure, and a fitting portion in which the lid is removably fitted to the lid body and the container body so as to be detachably attached to the container body is located between the flange portion and the container center. Side, and this mating part Container, characterized in that the container body is constituted by a convex portion formed on the other of either one recess formed between the container body and the lid of the lid.