JP2004123189A - Packaging container with lid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging container with a lid the the unnecessary area of whose thermoforming sheet material is reduced to the utmost, the area necessary of whose flange for an adhesive agent to cover formed on the surface is reduced to the utmost for saving the amount of the agent to be used, and yet whose inside is sufficiently airtight. <P>SOLUTION: Flanges 4, 5 in a fixed width are provided on the peripheral edge of the opening part 2 of a square shaped top open synthetic resin container body 1 and on the peripheral edge of a lid 3 covering the opening 2. The pair of the flanges 4, 5 are formed to join in sealing, and the lid 3 is connected through a hinge made of a half cut line 6 cut half from the outside of the container with the lid. The other flange surfaces excluding flanges 4a, 5a are provided with an easily openable adhesive agent layer 7 and both ends in the longitudinal direction of the layer 7 are arranged to come into contact with both ends of the half cut line 6 at both ends of the hinge. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a packaging container with a lid for sealingly packaging food and the like.
[0002]
[Prior art]
In general, as a typical example of a packaging container with a lid for sealingly packing foods and the like, a packaging container with a general-purpose lid, also called a flanged pack, is known in addition to an egg pack container.
[0003]
Specifically, as shown in FIGS. 3 and 4, the periphery of the opening of the container body 10 made of polyethylene terephthalate resin (PET) or the like and having a rectangular opening on the top surface, and the periphery of the lid 11 capable of sealing the same. The flanges 12 and 13 are formed respectively, and the connecting portion of these flanges 12 and 13 is thinned to have flexibility to form a hinge 14, and the entire periphery of the flange 12 is coated with a hot melt adhesive 15, When the lid 11 is closed, the flanges 12 and 13 overlap each other, and this is a packaging container with a lid that is sealed by heat sealing (for example, see Patent Literature 1).
[0004]
[Patent Document 1]
Japanese Utility Model Publication No. 62-7537 (FIGS. 1 and 2)
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional packaging container with a lid, the strip-shaped portion of the hinge 14 is formed by thinning the thermoforming sheet material to a predetermined width so as to have flexibility. It is necessary to provide a required area in advance for the thermoforming sheet material for the portion 14.
[0006]
When a band-shaped portion is provided as the hinge 14, when the lid 11 is closed, the hinge is bent in a state of protruding from the flange and becomes cylindrical, and when the internal space of the container communicates with the cavity formed therein, the airtightness is obtained. You can not maintain the nature.
[0007]
In order for the hinge to have sufficient airtightness, it is necessary to coat the entire periphery of the opening (flange) of the container body with a hot-melt adhesive. To seal the container, a considerable amount of adhesive was used.
[0008]
Therefore, an object of the present invention is to solve the above-mentioned problem, minimize the useless area of the sheet material for thermoforming of the lidded packaging container, and furthermore, the required covering area of the adhesive provided on the surface of the flange. Is to be reduced as much as possible to save the amount of adhesive used, and to ensure sufficient sealing in the packaging container.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, in the present invention, a flange is provided on a peripheral edge of an opening of a synthetic resin container main body having an upper surface opening, and a flange is provided on a peripheral edge of a lid that covers the opening. In the packaging container with a lid connected via a hinge so as to fit together, the hinge is formed by a half-cut line cut from the outside at the boundary between the pair of flanges of the container body and the lid, and the hinge of the pair of flanges An easy-open adhesive layer is provided on the surface excluding the adjacent flange, and both ends in the longitudinal direction of the flange of the easy-open adhesive layer are arranged so as to be in contact with the half-cut line at both ends of the hinge. This is a packaging container with a lid.
[0010]
In the packaging container with the lid of the present invention configured as described above, the hinge is formed so as to be bent at a half-cut line half-cut from the outside by cutting, so that it is not a thin and band-shaped hinge as in the related art. However, when closed, the entire inner surface of the flange is securely aligned, and it is not necessary to separately provide a hinge having a thin band shape and flexibility, and the thermoforming sheet material used per unit of the packaging container Can be designed to be smaller only in the portion of the flange adjacent to the hinge, and the cost of raw materials can be reduced.
[0011]
Further, since there is no strip-shaped hinge which is thin and has flexibility, the above-mentioned problem in the prior art, that is, "a cylindrical hollow along the flange when the lid is closed on the container body" is not formed. .
[0012]
With this, a packaging container with a lid in which the both ends in the longitudinal direction of the flange of the easily-openable adhesive layer are disposed so as to be in contact with the half-cut line at both ends of the hinge, and the entire periphery of the flange is sealed. It is possible to form an easy-opening adhesive layer only on the surface of the flange except for the hinge, and there is no need to coat the entire surface of the flange with hot melt adhesive. The use amount of the agent can be efficiently reduced.
[0013]
Further, in the packaging container with a lid of the present invention configured as described above, in order to further ensure the sealing property or the ease of opening the lid, besides appropriately selecting the type of the adhesive, the lid and the container It is preferable to provide a packaging container with a lid provided with a locking portion for fitting and locking a part of the main body.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to the accompanying drawings.
[0015]
As shown in FIGS. 1 and 2, the embodiment has flanges 4, 5, 5 on the periphery of an opening 2 of a container body 1 made of a synthetic resin having a rectangular shape with a top opening, and the periphery of a lid 3 covering the opening 2. The pair of flanges 4 and 5 are formed to have a constant width so as to be aligned at the time of sealing, and the lid 3 can be opened and closed via a hinge having a half-cut line 6 half-cut from the outside of the container. Is a packaging container with a lid connected to.
[0016]
A strip-shaped easy-opening adhesive layer 7 is provided on the surfaces of the other flanges except for the flanges 4a and 5a adjacent to the hinge, and both ends of the easy-opening adhesive layer 7 in the longitudinal direction are both ends of the hinge. The half-cut line 6 is arranged so as to be in contact with both ends of the half-cut line 6 at the portion.
[0017]
The synthetic resin for the container body used in the present invention is not particularly limited as long as it can be used for a packaging container, and specific examples thereof include a polyester resin such as a polyethylene terephthalate resin, a polypropylene resin, Examples include polyethylene resin, saponified ethylene-vinyl acetate copolymer, polyvinyl alcohol resin, polyamide resin (nylon), polystyrene resin, and vinyl chloride resin.
[0018]
In order to manufacture a packaging container with a lid using a continuous sheet made of such a synthetic resin, first, an easy-opening adhesive is applied to a portion where a flange is to be formed on one side of the conveyed continuous sheet by a screen printing technique or the like. After applying an easy-opening adhesive and then positioning, the packaging container with the lid having the shape shown in FIG. 1 was opened by heating and vacuum forming or pressure forming or a combination of these thermoforming methods as shown in FIG. Form into a state.
[0019]
Then, after the alignment, the sheet is cut to obtain a packaging container with a lid having the shape shown in FIG. 1. Simultaneously with or just before the cutting, a cut is formed with a blade to the middle of the sheet thickness, and the sheet is cut in half. A line 6 is formed. This method may be a cutting process such as a so-called half cut.
[0020]
The easily-openable adhesive layer used in the present invention employs a hot-melt adhesive which is easily applied by a printing method or the like, and preferably has high airtightness. In addition, when used in food packaging containers, particularly those having excellent water resistance, oil resistance, non-toxicity, acid resistance, and alkali resistance are preferable.If possible, the bonding temperature can be adjusted according to the material of the container, and the size can be relatively easily reduced. It is preferable that the adhesive force be adjusted to about 700 to 2500 g / 15 mm so that the seal can be opened with force and the peel feeling is good (also called easy peeling property).
[0021]
For example, for a packaging container formed of polyethylene terephthalate (PET) -based resin, a polyester-based hot melt adhesive is used as the easily-openable adhesive used for the packaging container.
[0022]
Adjustment of the adhesive force can be performed by a known method, for example, adjustment of the type and molecular weight or crystallinity of dicarboxylic acid and diol, mixing of linear copolymer polyester resin and chlorinated isotactic polypropylene, Mixing of polybutylene terephthalate and polyolefin resin for polyester of terephthalic acid, mixing of linear polyester and ethylene-vinyl acetate copolymer, styrene-butadiene for linear (or linear copolymer) polyester Techniques such as mixing of a styrene copolymer or a styrene-isoprene-styrene copolymer can be employed.
[0023]
As shown in FIG. 1, both ends of the flange 4 of the easily-openable adhesive layer 7 in the longitudinal direction are arranged so as to be in contact with both ends of the half-cut line 6 which is a hinge, and are adjacent to the half-cut line 6. The easy-opening adhesive layer 7 is not formed on the surfaces of the pair of flanges 4a, 5a.
[0024]
This eliminates the need to coat the entire surface of the flange with an adhesive, and reduces the required area of the adhesive to be used, so that the amount of the adhesive to be used is smaller than when the entire surface is applied. It is most preferable that both ends in the longitudinal direction of the easy-open adhesive layer 7 formed in a substantially C-shape on the flange surface of the periphery of the opening 2 are disposed at both ends of the hinge. The hinges may be placed closer to the center, in which case the amount of adhesive used will be increased by that extension.
[0025]
When the packaging container with the lid is sealed in the state shown in FIG. 2, the three sides of the flange 4 except for the flange 4 a are securely bonded with the easy-opening adhesive layer 7 and are bent at the half-cut line 6. In the hinge thus provided, the flange 4a and the flange 5a come into close contact with each other to be in an airtight state, whereby the entire periphery of the flange is sealed.
[0026]
Further, in the packaging container with a lid, in order to further ensure the sealing property or the re-sealability of the lid 3, it is necessary to engage the concave locking portions 8a and the convex locking portions 8b at the key points of the flanges 4 and 5. It is preferable to provide a locking container 8 provided with a lid, which can lock the lid 3 and the flanges 4 and 5, which are a part of the container body 1, with a lid.
[0027]
【The invention's effect】
As described above, in the present invention, the hinge is formed by a half-cut line cut from the outside at the boundary between the pair of flanges of the container body and the lid, and both ends in the longitudinal direction of the flange of the easily-openable adhesive layer are hinges. Since the packaging container with the lid is placed so that it touches the half-cut line at both ends, the conventional strip-shaped hinge is not necessary, and the area of the thermoforming sheet material used per packaging container is designed to be smaller by that portion. This has the advantage that the cost of raw materials can be reduced.
[0028]
Further, since the two ends in the longitudinal direction of the flange of the easily-openable adhesive layer are merely arranged so as to be in contact with the half-cut line at both ends of the hinge, the entire periphery of the flange is a sealed packaging container. It is no longer necessary to coat the entire surface of the packaging with an adhesive, and the required covering area of the adhesive is reduced as much as possible to save the amount of the adhesive used and to ensure a sufficient hermeticity of the packaging container. There are advantages.
[Brief description of the drawings]
FIG. 1 is a perspective view of an open state of a packaging container with a lid according to an embodiment. FIG. 2 is a perspective view of a closed state of a packaging container with a lid of the embodiment. FIG. 3 is a perspective view of an open state of a conventional packaging container with a lid. FIG. 4 is a perspective view of a conventional packaging container with a lid in a closed state.
1, 10 Container body 2 Openings 3, 11 Lids 4, 4a, 5, 5a, 12, 13 Flange 6 Half cut line 7 Easy-open adhesive layer 8 Locking portion 8a Recessed locking portion 8b Convex locking portion 14 Hinge 15 Hot melt adhesive

Claims (2)

Flanges are respectively provided on the periphery of the opening of the synthetic resin container body with the top opening and the periphery of the lid covering this opening, and the pair of flanges are connected via a hinge so as to be fitted at the time of sealing. In the container,
The hinge is formed by a half-cut line cut from the outside at a boundary between a pair of flanges of the container body and the lid, and an easy-opening adhesive layer is provided on a surface of the pair of flanges except for a flange adjacent to the hinge. A packaging container with a lid, wherein both ends in the longitudinal direction of the flange of the easily-openable adhesive layer are arranged so as to be in contact with the half-cut line at both ends of the hinge. 2. The packaging container with a lid according to claim 1, wherein the lid is provided with a locking portion for locking the lid with a part of the container body.

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