JP2007216976A - Packaging container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging container made of a transparent synthetic resin sheet material, which has both high sealing property and easy unsealing property in a container of a polygonal shape in a plan view and having a partial pressure difference especially at a fitting part between a container and a lid. <P>SOLUTION: The packaging container is composed of the container 1 and the lid 2, both of which are molded from a synthetic resin sheet material. A recessed fitting portion 21 provided on the peripheral edge of the lid 2 is fitted to a projecting fitting portion 13 raised on the opening edge of the container 1 to close the packaging container. When the container 1 and the lid 2 are fitted together, a continuous space S is interposed between the top surface 133 of the projecting fitting portion 13 of the container 1 and the top back surface 213 of the recessed fitting portion 21 of the lid 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、ともに合成樹脂シート材を用いた容器と蓋とからなり、収容した食料品等に対して雑菌が侵入することを抑制したり、食料品等に由来する液体物が外部に漏出することを防止できる密封性の高い包装用容器に関する。   The present invention is composed of a container and a lid, both of which use a synthetic resin sheet material, to suppress the invasion of germs into the stored foodstuff or the like, or the liquid material derived from the foodstuff leaks to the outside. The present invention relates to a packaging container with high sealing performance that can prevent this.

食料品、とくに調理済み惣菜や漬物類の包装に際しては、その内容や鮮度等が外部から容易に視認できるように、透明性の高い合成樹脂シート材を成形した包装用容器が用いられることが多い。こうした惣菜には水気の多いものや煮汁等を伴うものなどもあるので、小売店までの搬送中や店頭購入した消費者が持ち帰る際に液状物が外部に漏出しないよう、容器と蓋との密封性(水密性)を確保しておく必要がある。   When packaging foodstuffs, especially prepared side dishes and pickles, packaging containers made of highly transparent synthetic resin sheet materials are often used so that the contents, freshness, etc. can be easily seen from the outside. . Some of these prepared foods are damp and contain broth, so the container and lid must be sealed to prevent liquids from leaking outside during transportation to a retail store or when a consumer who has purchased them at the store takes it home. It is necessary to ensure the property (water tightness).

その一方、惣菜等については、小売店の店頭において調理済み品を量り売りするなど、消費者の目の前で小分けにして包装されることも多いし、過剰に強固な封止方法は消費者からも敬遠される傾向があるので、開封容易であることも求められる。また、反復開閉可能な容器は、購入者において食品保存容器として再利用されている実態もある。   On the other hand, side dishes etc. are often packaged in small portions in front of consumers, such as weighing and selling ready-made products at retail stores, and consumers have an overly strong sealing method. However, it is required to be easy to open. In addition, the container that can be repeatedly opened and closed is reused as a food storage container by the purchaser.

そこで、本件出願人は、先に密封性と易開封性を兼ね備えた、透明合成樹脂シート材を真空成型等してなる内外嵌合方式の密封容器を提案した（特許文献１）。この密封容器は、容器及び蓋の屈曲嵌合縁部における少なくとも口縁側を断面略Ｓ字状に屈曲させた構造としたもので、蓋を嵌めるときに容器口縁を滑り込み易くするとともに、従来品に比して密封性を高めることに成功した。さらに容器及び蓋の屈曲嵌合縁部における口縁側と外縁側との間の天井部を丸く形成したものでは、容器と蓋の密着性をより高めることができ、とくに蓋の屈曲嵌合縁部の天井部の曲率半径を容器のそれよりもやや小にすることで密着性がより良好となった。   Therefore, the applicant of the present application has previously proposed a sealed container of an internal / external fitting method, which has a sealing property and an easy-opening property and is formed by vacuum molding a transparent synthetic resin sheet material (Patent Document 1). This sealed container has a structure in which at least the mouth side of the bent fitting edge of the container and the lid is bent in a substantially S-shaped cross section, and the container mouth can be easily slid when the lid is fitted. We succeeded in improving the sealing performance as compared with. Further, in the case where the ceiling portion between the mouth edge side and the outer edge side of the bent fitting edge of the container and the lid is formed in a round shape, the adhesion between the container and the lid can be further improved. By making the curvature radius of the ceiling part of the container slightly smaller than that of the container, the adhesion became better.

特開２０００−１７７７６４号公報Japanese Unexamined Patent Publication No. 2000-177764

前記密封容器は、いかに容器と蓋の嵌合部分の密着性を高めるか、という観点から開発したものであったが、設計精度を高めるのが困難であるし、材料や成形環境による成形後の製品収縮によって歪み等が生じるおそれもあり、いかに密封性を確保するために容器と蓋の嵌合部分の密着性を高めようとしても周囲のどこかにおいて歪み等による隙間が生じやすく、いったん嵌合部分に水分が付着すると、毛細管現象により次々と水分が吸い出され、恰も水の道ができるかのように容器外への水分漏出が生じるのであった。とくに、容器と蓋の嵌合部分に対して全周に亘って均等な圧力が作用する平面視丸形容器の場合には設計精度を高めることにより優れた効果を発揮できたものの、部分的な圧力差が生じやすい平面視多角形容器にあっては、各辺部分（直線部分）と各隅部分、またそれらの接合部分の密着性を同等かつ均等に確保するのは困難であり、液状物の漏出を避けられなかった。   The sealed container was developed from the viewpoint of how to enhance the adhesion between the fitting part of the container and the lid, but it is difficult to improve the design accuracy, There is a possibility that distortion may occur due to product shrinkage, and no matter how much the adhesion between the container and the lid is improved in order to ensure the sealing performance, a gap due to distortion or the like is likely to occur somewhere around, and once fitted When moisture adheres to the portion, moisture is sucked out one after another by capillary action, and moisture leaks out of the container as if a water channel is formed. In particular, in the case of a round container in plan view in which a uniform pressure is applied to the fitting part of the container and the cover over the entire circumference, an excellent effect can be demonstrated by increasing the design accuracy, but partial In a polygonal container in plan view, where pressure differences are likely to occur, it is difficult to ensure the same and even adhesion between each side part (straight line part) and each corner part and their joint parts. The leakage of was inevitable.

したがって、本発明の課題とするところは、とくに平面視多角形容器においても、先に提案した平面視丸形容器と同程度の高い密封性と易開封性を兼ね備えた透明合成樹脂シート材からなる包装用容器を提供することにある。   Therefore, the subject of the present invention is a transparent synthetic resin sheet material that has both high sealing performance and easy opening performance as well as the previously proposed planar view round container, especially in a polygonal container in plan view. It is to provide a packaging container.

前記所期の課題解決を図るべく、本発明に係る包装用容器では、ともに合成樹脂シート材を成形してなる容器と蓋とからなり、容器の開口縁に立設した凸状嵌部に対して蓋の周縁に設けた凹状嵌部を嵌合することにより閉塞される包装用容器において、容器と蓋の嵌合時には、容器の凸状嵌部における頂部表面と蓋の凹状嵌部における頂部裏面との間に連続する空間が介在するよう形成した。   In order to solve the above-mentioned problems, the packaging container according to the present invention is composed of a container formed by molding a synthetic resin sheet material and a lid, and is formed with respect to a convex fitting portion standing on the opening edge of the container. In a packaging container that is closed by fitting a concave fitting provided on the periphery of the lid, when the container and the lid are fitted, the top surface of the convex fitting portion of the container and the top back surface of the concave fitting portion of the lid And a continuous space is interposed between them.

容器と蓋の嵌合部分の密着度を高めるべく金型精度を向上させても、成形製品の収縮や温度変化、内容物の種類や状態等による変形ひいては隙間の発生を回避することはできず、全ての製品において所望の密着性を確保することは困難である。本発明では、嵌合部分を全周全面に亘って密着させるという発想を転換し、むしろ容器と蓋の嵌合部分において、水平方向に、トンネル状に連続する狭く細長い空間を設けることで、閉蓋時に容器内部から容器外部へと連続する水の道を分断させることによって、結果的に容器内の水分漏出を防止することにしたのである。   Even if the mold accuracy is improved to improve the close contact between the container and the lid, it is impossible to avoid deformation due to shrinkage of the molded product, temperature change, content type and condition, and generation of gaps. It is difficult to ensure desired adhesion in all products. In the present invention, the idea of bringing the fitting part into close contact with the entire circumference is changed. Rather, the fitting part between the container and the lid is provided with a narrow and narrow space that is continuous in a tunnel shape in the horizontal direction. By severing the continuous water path from the inside of the container to the outside of the container at the time of the lid, it was decided to prevent moisture leakage in the container as a result.

したがって、容器と蓋の嵌合部分は、容器内側のラインと、容器外側のラインの２か所において、いずれも線状に接触・密着するようにしておく。容器の凸状嵌部は蓋体の凹状嵌部によって外側と内側を挟持された状態となり、容器内側のラインでは、容器内に収容された水分がその表面張力によって保持され（いわゆるウォーターシール状態）、漏出が防止される。仮に変形・振動等によって容器内の水分が嵌合部分の空間内に漏出したとしても、ある程度の水分量は前記嵌合部分の空間内に保持されることになるから、最終的に容器外への水分漏出が防止されるわけである。   Therefore, the fitting part of the container and the lid is in contact with and in close contact with each other at two places, the line inside the container and the line outside the container. The convex fitting portion of the container is sandwiched between the outer and inner sides by the concave fitting portion of the lid, and the moisture contained in the container is held by the surface tension in the line inside the container (so-called water seal state) Leakage is prevented. Even if the moisture in the container leaks into the space of the fitting part due to deformation, vibration, etc., a certain amount of moisture will be held in the space of the fitting part, so that finally the outside of the container This prevents water leakage.

本発明は、とくに全周に亘って均等な内圧負荷が望めず、内圧が高い部分と低い部分の圧力差が生じやすい平面視多角形の包装用容器において有用である。また、容器の凸状嵌部における頂部表面は平坦面に形成するとよい。例えば頂部表面を断面Ｖ字の溝状に陥没させることにすると、Ｖ字溝では水が流れやすくなるために容器内から容器内側のラインを越えて嵌合部分の空間内に漏出してしまった水が集まりやすくなり、このように水分が１か所に集まってしまうと、容器内から前記空間内へと連続する水の道が発生してしまい、結果的に水が容器外側のラインを越えて容器外へと漏出しやすくなるからである。   The present invention is particularly useful in a packaging container having a polygonal shape in plan view, in which a uniform internal pressure load cannot be expected over the entire circumference, and a pressure difference between a high internal pressure portion and a low internal pressure portion is likely to occur. Moreover, it is good to form the top surface in the convex fitting part of a container in a flat surface. For example, if the top surface is recessed into a V-shaped groove, water easily flows in the V-shaped groove, so that it leaks from the inside of the container over the inner line of the container into the space of the fitting portion. When water easily collects and water collects in one place in this way, a continuous water path from the inside of the container to the inside of the space occurs, and as a result, the water crosses the line outside the container. This makes it easier to leak out of the container.

さらに、蓋の凹状嵌部における頂部裏面を上方に湾曲させ、いわゆるドーム状に形成すると、容器の凸状嵌部を挟持しやすくなり、前述のような容器内側のラインと容器外側のラインの２か所の線接触・密着性が確保しやすくなる。   Furthermore, when the top back surface of the concave fitting portion of the lid is curved upward and formed into a so-called dome shape, the convex fitting portion of the container can be easily held, and the two lines of the container inner line and the container outer line as described above. It becomes easy to ensure the line contact and adhesion of the place.

本発明に係る包装用容器によれば、ともに透明合成樹脂シート材からなる容器と蓋とを嵌合させる包装用容器において、調理済み惣菜や漬物等の水気の多い食料品を包装した場合においても、嵌合部分にて容器内外の水の流れ道を分断することにより、高い密封性を実現できる。また、容器の凸状嵌部を蓋体の凹状嵌部で挟持させる構造なので、易開封性をも兼ね備えた包装用容器を提供することができ、とくに周縁嵌合部に内圧差が生じやすい平面視多角形容器として形成された包装用容器に好適である。   According to the packaging container according to the present invention, in the packaging container in which the lid and the container, both of which are made of a transparent synthetic resin sheet material, are fitted, even when packaging foods with a lot of moisture such as cooked prepared dishes and pickles By separating the water flow path inside and outside the container at the fitting portion, high sealing performance can be realized. In addition, since the convex fitting portion of the container is sandwiched between the concave fitting portions of the lid, it is possible to provide a packaging container that also has an easy-opening property. Suitable for packaging containers formed as viewing polygonal containers.

また、こうした漏水防止効果は、容器の凸状嵌部における頂部表面を平坦面として形成したり、蓋の凹状嵌部における頂部裏面を上方に湾曲させることによって、より一層高めることができる。   Moreover, such a water leakage prevention effect can be further enhanced by forming the top surface of the convex fitting portion of the container as a flat surface or by curving the back surface of the top of the concave fitting portion of the lid upward.

以下、本発明に係る包装用容器につき、図面にもとづいて詳細に説明する。図１は本発明に係る包装用容器の一例を示した平面図、図２は同包装用容器の正面図、図３は同包装用容器の容器の凸状嵌部と蓋体の凹状嵌部の部分拡大図、図４はこれら凸状嵌部と凹状嵌部の嵌合状態を示す部分拡大図である。各図に示された例の包装用容器は、四隅が滑らかな曲線を描いているものの平面視略正方形に形成されたものであり、ともに透明ポリエステル等の合成樹脂シート材を真空成型してなる容器１と蓋体２とから構成されている。   Hereinafter, the packaging container according to the present invention will be described in detail with reference to the drawings. 1 is a plan view showing an example of a packaging container according to the present invention, FIG. 2 is a front view of the packaging container, and FIG. 3 is a convex fitting part of the container of the packaging container and a concave fitting part of the lid. FIG. 4 is a partially enlarged view showing a fitting state of the convex fitting portion and the concave fitting portion. The packaging containers of the examples shown in each figure are formed in a substantially square shape in plan view, although they have smooth curves at the four corners, and both are formed by vacuum molding a synthetic resin sheet material such as transparent polyester. It is comprised from the container 1 and the cover body 2. As shown in FIG.

このような平面視多角形の包装用容器では、湾曲した四隅部分11と直線状をした四辺部分12とでは負荷される内圧が均等ではないため、容器１の上面側に位置する開口縁に立設した凸状嵌部13と、蓋体２の周縁に設けた凹状嵌部21との嵌合部分に密着ムラが生じやすく、その結果、局所的に弱く内溶液が漏れやすい部分が発生する可能性が高い。本発明では、前記凸状嵌部13の外方外壁面131と内方外壁面132を、それぞれ前記凹状嵌部21の外方内壁面211と内方内壁面212とで密着挟持するようにしつつ、容器１の凸状嵌部における頂部表面133と蓋体２の凹状嵌部21における頂部裏面213との間に空間Ｓが介在するようにする。そして、この空間Ｓが容器と蓋の嵌合部分の全周にわたって連続するように形成するのである。   In such a packaging container having a polygonal shape in plan view, the applied internal pressure is not uniform between the curved four-corner portion 11 and the straight four-side portion 12, so that it stands on the opening edge located on the upper surface side of the container 1. Adhesion unevenness is likely to occur in the fitting part between the provided convex fitting part 13 and the concave fitting part 21 provided on the peripheral edge of the lid 2, and as a result, a part that is weak locally and easily leaks the internal solution may occur. High nature. In the present invention, the outer outer wall surface 131 and the inner outer wall surface 132 of the convex fitting portion 13 are tightly sandwiched between the outer inner wall surface 211 and the inner inner wall surface 212 of the concave fitting portion 21, respectively. The space S is interposed between the top surface 133 of the convex fitting portion of the container 1 and the top back surface 213 of the concave fitting portion 21 of the lid 2. And it forms so that this space S may continue over the perimeter of the fitting part of a container and a lid | cover.

このように、閉蓋時における容器１と蓋２の嵌合部分は、容器内側のラインと容器外側のラインの２か所において密着状態となり、容器内に収容される内容物によっては水分が容器１と蓋２が密着する境界部分に付着し、いわゆるウォーターシール状態が実現される（図４におけるＷ）。容器１と蓋２との隙間が開かないかぎり、シール状態となった水分Ｗはその表面張力により維持されるのであるが、容器１と蓋２の隙間が開くと、水分Ｗは、場合によっては内容物に由来する他の水分を伴うかたちで嵌合部分に介在させた空間Ｓ内へと流入する。もとより、容器１と蓋２の嵌合部分（容器内側のライン）の隙間はわずかなものであるから、空間Ｓ内に大量の水分が流入することは想定されにくいところ、流入した水分は空間Ｓ内において周方向に移動するが、よほどの水溜まりとならないかぎり、容器外側のラインを越えて容器外への漏出を防止できる。   Thus, the fitting part of the container 1 and the lid 2 at the time of closing is in a close contact state at two locations of the line inside the container and the line outside the container, and depending on the contents contained in the container, moisture may be contained in the container. 1 and the cover 2 adhere to the boundary portion where they are in close contact, and a so-called water seal state is realized (W in FIG. 4). As long as the gap between the container 1 and the lid 2 is not opened, the sealed water W is maintained by its surface tension. However, if the gap between the container 1 and the lid 2 is opened, the moisture W may be It flows into the space S interposed in the fitting portion in a form accompanied by other moisture derived from the contents. Of course, since the gap between the fitting part (line inside the container) between the container 1 and the lid 2 is very small, it is difficult to expect a large amount of moisture to flow into the space S. Although it moves in the circumferential direction, leakage to the outside of the container can be prevented beyond the line on the outside of the container as long as there is no significant water pool.

図３及び図４に示されるように、容器１の凸状嵌部13における頂部表面133は、ほぼ水平な平坦面として形成されている。このようにほぼ水平な平坦面に形成することで、仮に内容物に由来する水分が空間Ｓ内に流入してしまった場合においても、その水分が容器内側位置Ｖ１に集まって次なる水分を誘引するおそれを少なくすることができるし、また、その水分が容器外側位置Ｖ２に集まって容器外方へ漏出するおそれを少なくすることができる。   As shown in FIGS. 3 and 4, the top surface 133 of the convex fitting portion 13 of the container 1 is formed as a substantially horizontal flat surface. By forming it on a substantially horizontal flat surface in this way, even if moisture derived from the contents flows into the space S, the moisture gathers at the container inner position V1 and attracts the next moisture. In addition, it is possible to reduce the risk that the moisture will collect at the container outer position V2 and leak out of the container.

そして、蓋２の凹状嵌部21における頂部裏面213は、上方に湾曲させたドーム状に形成されている。ドーム状をした湾曲面により発揮されるバネ性（凹状嵌部21の外方内壁面211と内方内壁面212が閉じようとする力）を利用して、容器１における凸状嵌部13を確実に挟持させようとするものである。したがって、図３に示されるように、蓋２における凹状嵌部21の横幅は、その上方位置（Ａ−Ａ）より下方位置（Ａ’−Ａ’）が狭くなるように形成し、容器１の凸状嵌部13が前記凹状嵌部21を拡幅しながら押し込まれるように形成しておくのが望ましい。   The top back surface 213 of the concave fitting portion 21 of the lid 2 is formed in a dome shape curved upward. The convex fitting part 13 in the container 1 is made by utilizing the spring property (the force that the outer inner wall surface 211 and the inner inner wall face 212 of the concave fitting part 21 are closed) exerted by the dome-shaped curved surface. It is intended to be securely clamped. Therefore, as shown in FIG. 3, the lateral width of the concave fitting portion 21 in the lid 2 is formed so that the lower position (A′-A ′) is narrower than the upper position (AA). It is desirable that the convex fitting portion 13 is formed so as to be pushed in while widening the concave fitting portion 21.

本発明に係る包装用容器の一例を示した平面図である。It is the top view which showed an example of the packaging container which concerns on this invention. 図１の例の包装用容器の正面図である。It is a front view of the container for packaging of the example of FIG. 図１の例の包装用容器の容器の凸状嵌部と蓋体の凹状嵌部の部分拡大図である。It is the elements on larger scale of the convex fitting part of the container of the packaging container of the example of FIG. 1, and the concave fitting part of a cover body. 図３の凸状嵌部と凹状嵌部の嵌合状態を示す部分拡大図である。It is the elements on larger scale which show the fitting state of the convex fitting part and concave fitting part of FIG.

符号の説明Explanation of symbols

１ 容器
２ 蓋
１１ 容器の四隅部分
１２ 容器の四辺部分
１３ 凸状嵌部
２１ 凹状嵌部
１３１ 凸状嵌部の外方外壁面
１３２ 凸状嵌部の内方外壁面
２１１ 凹状嵌部の外方内壁面
２１２ 凹状嵌部の内方内壁面
Ｓ 空間
Ｗ （内容物に由来する）水分 DESCRIPTION OF SYMBOLS 1 Container 2 Cover 11 Four corners of a container 12 Four sides of a container 13 Convex fitting part 21 Concave fitting part 131 Outer outer wall surface of convex fitting part 132 Inner outer wall surface of convex fitting part 211 Outward side of concave fitting part Inner wall surface 212 Inner inner wall surface of concave fitting portion S Space W (Derived from contents) Moisture

Claims (4)

ともに合成樹脂シート材を成形してなる容器と蓋とからなり、容器の開口縁に立設した凸状嵌部に対して蓋の周縁に設けた凹状嵌部を嵌合することにより閉塞される包装用容器において、容器と蓋の嵌合時には、容器の凸状嵌部における頂部表面と蓋の凹状嵌部における頂部裏面との間に連続する空間が介在するよう形成してなる包装用容器。 Both are composed of a container formed by molding a synthetic resin sheet material and a lid, and are closed by fitting a concave fitting portion provided on the periphery of the lid to a convex fitting portion standing on the opening edge of the container. In a packaging container, when the container and the lid are fitted, the packaging container is formed so that a continuous space is interposed between the top surface of the convex fitting portion of the container and the top back surface of the concave fitting portion of the lid. 包装用容器が、平面視多角形状である請求項１記載の包装用容器。 The packaging container according to claim 1, wherein the packaging container has a polygonal shape in plan view. 容器の凸状嵌部における頂部表面を平坦面としたことを特徴とする請求項１又は２いずれか記載の包装用容器。 The packaging container according to claim 1, wherein the top surface of the convex fitting portion of the container is a flat surface. 蓋の凹状嵌部における頂部裏面を上方に湾曲させたことを特徴とする請求項１ないし３いずれか記載の包装用容器。 The packaging container according to any one of claims 1 to 3, wherein the top back surface of the concave fitting portion of the lid is curved upward.

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