JP2004106865A - Plastic tray container - Google Patents

Plastic tray container Download PDF

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Publication number
JP2004106865A
JP2004106865A JP2002269626A JP2002269626A JP2004106865A JP 2004106865 A JP2004106865 A JP 2004106865A JP 2002269626 A JP2002269626 A JP 2002269626A JP 2002269626 A JP2002269626 A JP 2002269626A JP 2004106865 A JP2004106865 A JP 2004106865A
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Japan
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heat
convex
plastic
fused
container
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JP2002269626A
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JP4269609B2 (en
Inventor
Tadasuke Kojima
小嶋　忠祐
Hideki Miyazawa
宮沢　秀木
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Toppan Inc
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Toppan Printing Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a plastic tray container for housing cooked food, rice, desserts or the like consisting of a rectangular parallelopiped tray-like plastic container 30 with corners rounded which is injection-molded of an appropriate plastic material such as a high density polyethylene and a polypropylene, and is characterized by the form of a flange 31 which can well keep sealability and unsealability with a lid 40 concurrently. <P>SOLUTION: The the corner-rounded rectangular ring-like flange 31 thermally welds the appropriate lid 40 on the corner-rounded parallelopiped tray-like plastic container 30 for sealing. Two strings of thermally welded protruding lines 2 and 2 each including an arcuate projection (a) outside a top surface and a flat part (b) inside the top face on the upper surface are provided on the upper surface of the flange 31. The two lines 2 and 2 are brought together into a single line at the rounded corner of the flange 31. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、調理済食品や米飯類やデザート類などを収容する蓋材４０との密封性と開封性とを、同時に良好に保持することができるフランジ部３１の形状に特徴があるプラスチックトレー容器に関する。
【０００２】
【従来の技術】
従来から、調理済食品や米飯類やデザート類などを収容する高密度ポリエチレンやポリプロピレンなどの適宜のプラスチック材料を用いて射出成形した、例えば図３に示すような、角を丸めた直方体トレー状のプラスチック容器３０の角を丸めた長方形リング状のフランジ部３１の上面に、適宜の蓋材を熱融着して密封するプラスチックトレー容器が、一般に広く用いられている。
【０００３】
また従来から、前述した図３に示すような、角を丸めた直方体トレー状のプラスチック容器３０の角を丸めた長方形リング状のフランジ部３１の上面に、図４Ａに示す台形状の熱融着凸筋３を設けて、また図４Ｂに示す偏平Ｕ字状の非熱融着凹溝４を設けて、さらに図４Ｃに示すリング状の熱融着樹脂片５を載置して、それぞれ適宜の蓋材を熱融着して密封するプラスチックトレー容器が、一般に用いられている。
【０００４】
【発明が解決しようとする課題】
ところが従来の図３に示すプラスチックトレー容器については、角を丸めた長方形リング状のフランジ部３１の上面に、図示していない適宜の蓋材の下面を、強固に熱融着（温度、圧力、時間）して、収容した調理済食品や米飯類やデザート類などを、完全に密封することができるものの、蓋材を剥がしてプラスチック容器３０を開封する時には、フランジ部３１の上面に蓋材の下面を強固に熱融着したために、蓋材が剥がし難いなどのプラスチックトレー容器の開封性に問題があって、また逆に、フランジ部３１の上面に蓋材の下面を、蓋材が剥がし易いように熱融着する温度、圧力、時間を適度に調節して、軽めに熱融着して密封することができるものの、取扱い時や保管、運搬時などの衝撃によって、また加熱殺菌時などの内部熱圧力によって、蓋材が剥がれ易いなどのプラスチックトレー容器の密封性に問題があって、蓋材との密封性と開封性とを、同時に良好に保持することが難しいプラスチックトレー容器であった。
【０００５】
また従来の図３に示すプラスチック容器３０の角を丸めた長方形リング状のフランジ部３１の上面に、図４Ａに示す台形状の熱融着凸筋３を設けたプラスチックトレー容器については、フランジ部３１の台形状の熱融着凸筋３の上面に、図示していない適宜の蓋材の下面を、強固に熱融着してプラスチック容器３０を密封することができるものの、また台形状の熱融着凸筋３の上面に強固に熱融着した部分の蓋材の下面の後述するシーラント層を破壊するなどして、蓋材を剥がしてプラスチック容器３０を開封することができるものの、フランジ部３１の台形状の熱融着凸筋３が、１列で狭幅であるために、台形状の熱融着凸筋３の上面に強固に熱融着した部分の蓋材の下面に、ピンホールや層間剥離などが発生する恐れがあって、蓋材との密封性（液漏れなど）に、やや不安があるプラスチックトレー容器であった。
【０００６】
さらに従来の図３に示すプラスチック容器３０の角を丸めた長方形リング状のフランジ部３１の上面に、図４Ｂに示す偏平Ｕ字状の非熱融着凹溝４を設けたプラスチックトレー容器については、フランジ部３１の上面の偏平Ｕ字状の非熱融着凹溝４を除いた２列の部分に、図示していない適宜の蓋材の下面を、強固に熱融着してプラスチック容器３０を密封することができるものの、また強固に熱融着したフランジ部３１の上面に、熱融着していない偏平Ｕ字状の非熱融着凹溝４が存在するために、比較的容易に、蓋材を剥がしてプラスチック容器３０を開封することができるものの、フランジ部３１の偏平Ｕ字状の非熱融着凹溝４を除いた部分が、２列であっても狭幅であるために、偏平Ｕ字状の非熱融着凹溝４を除いた２列の強固に熱融着した部分の蓋材の下面に、同様にピンホールや層間剥離などが発生する恐れがあって、蓋材との密封性（液漏れなど）に、やや不安があるプラスチックトレー容器であった。
【０００７】
加えて従来の図３に示すプラスチック容器３０の角を丸めた長方形リング状のフランジ部３１の上面に、図４Ｃに示すリング状の熱融着樹脂片５を載置したプラスチックトレー容器については、例えばエチレン−メタアクリル酸共重合体（ＥＭＡＡ）やエチレン−酢酸ビニル共重合体（ＥＶＡ）などの密封性などが優れている上に、熱融着した後に容易に剥離することができる（イージーピール性と言う）、リング状の熱融着樹脂片５を載置したフランジ部３１の上面に、図示していない適宜の蓋材の下面を、この熱融着樹脂片５を介して強固に熱融着して密封することができる、また強固に熱融着した熱融着樹脂片５を容易に剥離して、蓋材を剥がして開封することができる、蓋材との密封性と開封性とを、同時に良好に保持することができる優れたプラスチックトレー容器であるものの、フランジ部３１の上面にリング状の熱融着樹脂片５を、別工程で載置（場合によってはプレシール）する必要があって、工程が煩雑で費用が嵩むことが問題であった。
【０００８】
そこで、本発明の目的は、調理済食品や米飯類やデザート類などを収容する、高密度ポリエチレンやポリプロピレンなどの適宜のプラスチック材料を用いて射出成形した、角を丸めた直方体トレー状のプラスチック容器３０であって、蓋材４０との密封性と開封性とを、同時に良好に保持することができるフランジ部３１の形状に特徴があるプラスチックトレー容器を提供することにある。
【０００９】
【課題を解決するための手段】
本発明のプラスチックトレー容器は、図１、図２に示すように、角を丸めた直方体トレー状のプラスチック容器３０の適宜の蓋材４０を熱融着して密封する角を丸めた長方形（図１Ｂでは正方形）リング状のフランジ部３１の上面に、頂面外側にＲ凸部ａと頂面内側に平坦部ｂとを備えた熱融着凸筋２を設けたことを特徴とするプラスチックトレー容器である。
【００１０】
本発明のプラスチックトレー容器においては、角を丸めた直方体トレー状のプラスチック容器３０の角を丸めた長方形リング状のフランジ部３１の上面に、頂面外側にＲ凸部ａと頂面内側に平坦部ｂとを備えた熱融着凸筋２を設けたことによって、それぞれ図示していない適宜の紙材料層や樹脂フィルム層やバリヤー層などとシーラント層とを、適宜に積層して成る蓋材４０の下面を、フランジ部３１の上面の熱融着凸筋２の頂面外側のＲ凸部ａに、強固に熱融着して、同時に熱融着凸筋２の頂面内側の平坦部ｂに、軽めに熱融着して、収容した調理済食品や米飯類やデザート類などを、完全に密封することができる。
【００１１】
すなわち、図１Ｃに示すフランジ部３１の上面の熱融着凸筋２の頂面外側のＲ凸部ａが、幅狭であるために、また熱融着凸筋２の頂面内側の平坦部ｂに、段差があるために、フランジ部３１の上面と蓋材４０の下面との熱融着工程で、図２Ａに示すように、この幅狭のＲ凸部ａが、下面のシーラント層に食込むように強固に熱融着することによって、取扱い時や保管、運搬時などの衝撃による、また加熱殺菌時などの内部熱圧力による、蓋材４０の剥がれなどを防止するものであって、同時に段差がある平坦部ｂが、下面のシーラント層に軽め（段差があるために、熱融着する圧力が低くなる）に熱融着することによって、幅狭のＲ凸部ａが食込むように強固に熱融着したシーラント層に、ピンホールや層間剥離などが発生する恐れがあっても、この軽めに熱融着した部分が、液漏れなどを防止するものであって、しかも蓋材４０を剥がしてプラスチック容器３０を開封する時には、幅狭のＲ凸部ａが食込むように強固に熱融着した部分の蓋材４０を、下面のシーラント層を破壊するなどして比較的容易に剥がして、同時に段差がある平坦部ｂが軽めに熱融着した部分の蓋材４０を、容易に剥がして、プラスチック容器３０を開封するものであって、蓋材４０との密封性と開封性とを、同時に良好に保持することができるフランジ部３１の形状に特徴があるプラスチックトレー容器を提供することができる。
【００１２】
加えて、本発明のプラスチックトレー容器は、図１Ｃに示すように、頂面外側にＲ凸部ａと頂面内側に平坦部ｂとを備えた熱融着凸筋２の外側斜面ｃの傾斜角度が３０度以下で内側斜面ｄの傾斜角度が６０度以上であることを特徴とするプラスチックトレー容器である。
【００１３】
本発明のプラスチックトレー容器においては、前述したフランジ部３１の上面と蓋材４０の下面との熱融着工程で、図２Ａに示すように、頂面外側にＲ凸部ａと頂面内側に平坦部ｂとを備えた熱融着凸筋２の幅狭のＲ凸部ａが下面のシーラント層に食込むように強固に熱融着して、同時に段差がある平坦部ｂが下面のシーラント層に軽めに熱融着した時に、強固に熱融着したＲ凸部ａの外側斜面ｃの傾斜角度が３０度以下であることによって、下面のシーラント層を破壊するなどして、蓋材４０を剥がし易いことを知見したものであって、また軽めに熱融着した平坦部ｂの内側斜面ｄの傾斜角度が６０度以上であることによって、前述した衝撃や内部熱圧力によっても、蓋材４０が剥がれ難いことを知見したものであって、蓋材４０との密封性と開封性とを、同時により良好に保持したプラスチックトレー容器を提供することができる。
【００１４】
また加えて、本発明のプラスチックトレー容器は、図１Ｂ、Ｄに示すように、角を丸めた長方形リング状のフランジ部３１の上面に、それぞれ頂面外側にＲ凸部ａと頂面内側に平坦部ｂとを備えた、２列の熱融着凸筋２、２を設けて、この２列の熱融着凸筋２、２を、フランジ部３１の丸みがある角隅で１列にまとめたことを特徴とするプラスチックトレー容器である。
【００１５】
本発明のプラスチックトレー容器においては、角を丸めた長方形リング状のフランジ部３１の上面に、それぞれ頂面外側にＲ凸部ａと頂面内側に平坦部ｂとを備えた、２列の熱融着凸筋２、２を設けたことによって、前述したフランジ部３１の上面と蓋材４０の下面との熱融着工程で、図２Ａに示すように、２列の幅狭のＲ凸部ａ、ａが下面のシーラント層に食込むように強固に熱融着して、前述した衝撃や内部熱圧力による蓋材４０の剥がれなどをより完全に防止するものであって、同時に２列の段差がある平坦部ｂ、ｂが下面のシーラント層に軽めに熱融着して、前述したピンホールや層間剥離などによる液漏れなどをより完全に防止するものであって、特に蓋材４０との密封性を、より完全に良好に保持したプラスチックトレー容器を提供することができる。
【００１６】
しかも、本発明のプラスチックトレー容器においては、この２列の熱融着凸筋２、２を、フランジ部３１の丸みがある角隅で１列にまとめたことによって、フランジ部３１の丸みがある角隅に相当する部分に設けた、図２Ｂに示す蓋材４０のつまみ４１を引張るなどして、蓋材４０を剥がしてプラスチック容器３０を開封する時には、１列にまとめた幅狭のＲ凸部ａが食込むように強固に熱融着した部分の蓋材４０を剥がすだけで、同時に１列にまとめた段差がある平坦部ｂが軽めに熱融着した部分の蓋材４０を剥がすだけで、この２列の熱融着凸筋２、２が熱融着した部分の蓋材４０を、順次容易に剥がして、プラスチック容器３０を開封するものであって、蓋材４０との開封性を、同時に良好に保持したプラスチックトレー容器を提供することができる。
【００１７】
【発明の実施の形態】
図１Ａは、本発明の実施の形態におけるプラスチックトレー容器の断面図であって、図１Ｂは、プラスチックトレー容器のフランジ部３１の平面図であって、図１Ｃ、Ｄは、このフランジ部３１の拡大断面図である。
また図２Ａ、Ｂは、本発明の実施の形態におけるプラスチックトレー容器のフランジ部３１に、蓋材４０を熱融着した状態を示す拡大断面図である。
【００１８】
すなわち、角を丸めた直方体トレー状のプラスチック容器３０の角を丸めた正方形（長方形）リング状の７．４ｍｍ幅のフランジ部３１の上面に、それぞれ頂面外側に０．８ｍｍ幅で０．４ｍｍ高さのＲ凸部ａと頂面内側に１．２ｍｍ幅の平坦部ｂとを備えた、図１Ｂ、Ｃに示す２列の熱融着凸筋２、２を設けて、この２列の熱融着凸筋２、２を、図１Ｂ、Ｄに示すように、フランジ部３１の丸みがある角隅で１列にまとめた、図１Ａに示すプラスチック容器３０であって、ポリプロピレン（Ｊ２００３ＧＰ、軟化点１２５℃、出光石油化学製）を用いて射出成形して、収容部の縦、横、深さが７５×７５×４５ｍｍで平均肉厚が０．６ｍｍの角を丸めた直方体トレー状の本実施の形態のプラスチックトレー容器を作製した。
【００１９】
次に、２２０ｇの調理済のカレースープ（１食分）を収容した、図１Ａに示すプラスチック容器３０のフランジ部３１の上面に、美麗な印刷をした延伸ポリプロピレン（ＯＰＰ、３０μｍ）と延伸ナイロン（ＯＮＹ、１２μｍ）とセラミック蒸着付のポリエステル（ＰＥＴ、２０μｍ）とシーラント層として軟化点１０５℃の無延伸ポリプロピレン（ＣＰＰ、５０μｍ）とを、適宜に積層して成る蓋材４０の下面を、通常の熱融着工程で、図２Ａに示すように、２列の０．８ｍｍ幅で０．４ｍｍ高さのＲ凸部ａ、ａが、下面のシーラント層に食込むように強固に熱融着して、同時に２列の１．２ｍｍ幅の平坦部ｂ、ｂが、下面の食込まれた熱溶融したシーラント層を受けるように軽め（０．４ｍｍの段差があるために、熱融着する圧力が低くなる）に熱融着して、本実施の形態のプラスチックトレー容器を密封した。
【００２０】
本実施の形態のプラスチックトレー容器においては、フランジ部３１の上面に設けた２列の熱融着凸筋２、２の２列のＲ凸部ａ、ａが、下面のシーラント層に食込むように強固に熱融着して、取扱い時や保管、運搬時などの衝撃による、また加熱殺菌時などの内部熱圧力による、蓋材４０の剥がれなどを完全に防止することができる、同時に２列の平坦部ｂ、ｂが、下面の食込まれた熱溶融したシーラント層を受けるように軽めに熱融着して、食込むように強固に熱融着したシーラント層に、ピンホールや層間剥離などが発生する恐れがあっても、液漏れなどを完全に防止することができる、しかも、この２列の熱融着凸筋２、２を、フランジ部３１の丸みがある角隅で１列にまとめたことによって、図２Ｂに示す蓋材４０のつまみ４１を引張るなどして、１列にまとめたＲ凸部ａが食込むように強固に熱融着した部分を剥がすだけで、この２列の熱融着凸筋２、２が熱融着した部分の蓋材４０を、順次容易に剥がして開封することができる、蓋材４０との密封性と開封性とを、同時に良好に保持したプラスチックトレー容器を得ることができた。
【００２１】
【発明の効果】
以上、実施の形態ほかに示すとおり、本発明のプラスチックトレー容器においては、調理済食品や米飯類やデザート類などを収容する高密度ポリエチレンやポリプロピレンなどの適宜のプラスチック材料を用いて射出成形した角を丸めた直方体トレー状のプラスチック容器３０であって、蓋材４０との密封性と開封性とを、同時に良好に保持することができるフランジ部３１の形状に特徴があるプラスチックトレー容器を提供することができる。
【図面の簡単な説明】
【図１】図１Ａは、本発明の実施の形態におけるプラスチックトレー容器の断面図、図１Ｂは、プラスチックトレー容器のフランジ部３１の平面図、図１Ｃ、Ｄは、このフランジ部３１の拡大断面図である。
【図２】図２Ａ、Ｂは、本発明の実施の形態におけるプラスチックトレー容器のフランジ部３１に蓋材４０を熱融着した状態を示す拡大断面図である。
【図３】従来のプラスチックトレー容器の断面図である。
【図４】図４Ａ、Ｂ、Ｃは、従来のプラスチックトレー容器におけるフランジ部３１の拡大断面図である。
【符号の説明】
２、３　…熱融着凸筋
４　　　　…非熱融着凹溝
５　　　　…熱融着樹脂片
３０　　　…プラスチック容器
３１　　　…フランジ部
４０　　　…蓋材
４１　　　…つまみ
ａ　　　…Ｒ凸部
ｂ　　　　…平坦部
ｃ　　　　…外側斜面
ｄ　　　　…内側斜面[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a plastic tray container characterized by the shape of the flange portion 31 which can simultaneously maintain the sealing property and the opening property with the lid member 40 for storing cooked foods, cooked rice, desserts and the like. About.
[0002]
[Prior art]
Conventionally, injection molding using an appropriate plastic material such as high-density polyethylene or polypropylene for storing cooked foods, cooked rice, desserts, etc., for example, as shown in FIG. A plastic tray container in which an appropriate lid material is heat-sealed and sealed on the upper surface of a rectangular ring-shaped flange portion 31 with rounded corners of the plastic container 30 is generally widely used.
[0003]
Conventionally, a trapezoidal heat seal shown in FIG. 4A is formed on the upper surface of a rectangular ring-shaped flange portion 31 having rounded corners of a rectangular parallelepiped tray-shaped plastic container 30 as shown in FIG. The convex streaks 3 are provided, the flat U-shaped non-heat-fused concave grooves 4 shown in FIG. 4B are provided, and the ring-shaped heat-fused resin pieces 5 shown in FIG. A plastic tray container in which the lid material is heat-sealed and sealed is generally used.
[0004]
[Problems to be solved by the invention]
However, in the conventional plastic tray container shown in FIG. 3, the lower surface of an appropriate lid material (not shown) is firmly heat-fused (temperature, pressure, pressure, etc.) on the upper surface of a rectangular ring-shaped flange portion 31 with rounded corners. Time), the stored cooked food, cooked rice, desserts, etc. can be completely sealed. However, when the lid is peeled off and the plastic container 30 is opened, the lid is placed on the upper surface of the flange portion 31. Because the lower surface is firmly heat-sealed, there is a problem in the openability of the plastic tray container such that the lid material is difficult to peel off, and conversely, the lower surface of the lid material is easily peeled off on the upper surface of the flange portion 31. The temperature, pressure, and time for heat fusion can be adjusted appropriately, and lightly heat-sealed and sealed, but due to the impact during handling, storage, transportation, and during heat sterilization, etc. Internal heat pressure Therefore, there is a problem in the sealing performance of the plastic tray container such as easy peeling lid, a sealing property and opening property and lid and a plastic tray container it is difficult to simultaneously good retention.
[0005]
4A, a trapezoidal heat-fused convex streak 3 shown in FIG. 4A is provided on the upper surface of a rectangular ring-shaped flange 31 having rounded corners of the conventional plastic container 30 shown in FIG. Although the lower surface of an appropriate lid member (not shown) can be firmly heat-sealed to seal the plastic container 30 on the upper surface of the trapezoidal heat-fused convex streaks 3, the trapezoidal heat-sealing can be achieved. Although the sealant layer, which will be described later, on the lower surface of the lid material firmly heat-fused to the upper surface of the fusion protrusion 3 can be peeled off, the plastic container 30 can be opened by peeling the lid material, but the flange portion Since the trapezoidal heat-fused convex stripes 31 are narrow in one row, a pin is firmly attached to the upper surface of the trapezoidal heat-fused convex stripes 3 at the lower surface of the lid member. Holes and delamination may occur, and The sealing property (such as liquid leakage) was plastic tray container there is little anxiety.
[0006]
Further, regarding a conventional plastic tray container having a flat U-shaped non-heat-fused concave groove 4 shown in FIG. 4B on the upper surface of a rectangular ring-shaped flange portion 31 with rounded corners of the conventional plastic container 30 shown in FIG. The lower surface of an appropriate lid material (not shown) is firmly heat-sealed to the two rows of the upper surface of the flange portion 31 excluding the flat U-shaped non-heat-fusion groove 4. However, since the flat U-shaped non-heat-fused concave groove 4 which is not heat-fused is present on the upper surface of the strongly heat-fused flange portion 31, it is relatively easy. Although the plastic container 30 can be opened by peeling off the lid member, the portion of the flange portion 31 except for the flat U-shaped non-heat-fused concave groove 4 is narrow even in two rows. In addition, two rows of firmly heat-fused grooves excluding the flat U-shaped The lower surface of the lid of the portions, there is a possibility that such may occur similarly pinholes or delamination, the sealing of the lid (such as liquid leakage) was plastic tray container there is little anxiety.
[0007]
In addition, regarding the conventional plastic tray container in which the ring-shaped heat-fused resin piece 5 shown in FIG. 4C is mounted on the upper surface of a rectangular ring-shaped flange portion 31 with rounded corners of the conventional plastic container 30 shown in FIG. For example, ethylene-methacrylic acid copolymer (EMAA) and ethylene-vinyl acetate copolymer (EVA) have excellent sealing properties and the like, and can be easily peeled off after thermal fusion (Easy Peel) The upper surface of the flange portion 31 on which the ring-shaped heat-fused resin piece 5 is placed, the lower surface of an appropriate lid material (not shown) is firmly heated via the heat-fused resin piece 5. It can be sealed by fusing, and the heat-fused resin piece 5 that has been strongly heat-sealed can be easily peeled off, and the lid can be peeled off and opened. And can be held well at the same time. Although it is an excellent plastic tray container, it is necessary to place the ring-shaped heat-fused resin piece 5 on the upper surface of the flange portion 31 in a separate step (in some cases, pre-seal), which is complicated and costly. Bulk was a problem.
[0008]
Therefore, an object of the present invention is to provide a plastic container in the shape of a rectangular parallelepiped tray with rounded corners, which accommodates cooked food, cooked rice, desserts, and the like, and is injection-molded using an appropriate plastic material such as high-density polyethylene or polypropylene. The object of the present invention is to provide a plastic tray container which is characterized by the shape of the flange portion 31 which is capable of holding the sealing property and the opening property with the lid member 40 simultaneously and satisfactorily.
[0009]
[Means for Solving the Problems]
As shown in FIGS. 1 and 2, the plastic tray container of the present invention has a rounded rectangular shape (see FIG. A plastic tray provided on the upper surface of a ring-shaped flange portion 31 with a heat-fused convex streak 2 having an R convex portion a on the outer side of the top surface and a flat portion b on the inner side of the top surface. Container.
[0010]
In the plastic tray container of the present invention, an R convex portion a on the top outer side and a flat on the inner side of the top surface are formed on the upper surface of the rectangular ring-shaped flange portion 31 with the rounded corners of the rectangular parallelepiped tray-shaped plastic container 30 with the rounded corners. By providing the heat-fused convex streaks 2 provided with the portion b, a cover material formed by appropriately laminating a suitable paper material layer, a resin film layer, a barrier layer, or the like and a sealant layer, not shown, respectively. The lower surface of the heat-fused convex bar 40 is firmly heat-fused to the R convex portion a on the upper surface of the heat-fused convex bar 2 on the upper surface of the flange portion 31, and at the same time, the flat portion inside the top surface of the heat-fused convex bar 2 b, lightly heat-sealed, and the stored cooked food, cooked rice, desserts, etc. can be completely sealed.
[0011]
That is, since the R convex portion a on the outer surface of the top surface of the heat fusion convex streak 2 on the upper surface of the flange portion 31 shown in FIG. 1C is narrow, the flat portion inside the top surface of the heat fusion convex streak 2 is also small. b, there is a step, so in the heat fusion step of the upper surface of the flange portion 31 and the lower surface of the lid member 40, as shown in FIG. By firmly heat-sealing so as to penetrate, it is intended to prevent peeling of the lid member 40 due to an impact during handling, storage, transportation, or the like, or due to internal heat pressure during heat sterilization, At the same time, the flat portion b having the step is heat-sealed lightly to the sealant layer on the lower surface (the pressure for heat-sealing is reduced due to the step), so that the narrow R convex portion a bites. Pinholes and delamination may occur in the sealant layer This lightly heat-sealed portion prevents liquid leakage and the like. Further, when the lid member 40 is peeled off and the plastic container 30 is opened, the narrow R-convex portion a is cut out. The lid material 40 in the strongly heat-sealed portion is relatively easily peeled off by destroying the sealant layer on the lower surface, and at the same time, the lid material 40 in the portion where the flat portion b having the step is lightly heat-sealed. Is easily peeled off, and the plastic container 30 is opened. The plastic tray is characterized by the shape of the flange portion 31 which can simultaneously and satisfactorily maintain the sealing property and the opening property with the lid member 40. A container can be provided.
[0012]
In addition, as shown in FIG. 1C, the plastic tray container of the present invention has a slope of the outer slope c of the heat-fused convex streak 2 provided with an R convex portion a on the outer side of the top surface and a flat portion b on the inner side of the top surface. A plastic tray container characterized in that the angle is 30 degrees or less and the inclination angle of the inner slope d is 60 degrees or more.
[0013]
In the plastic tray container of the present invention, as shown in FIG. 2A, in the heat fusion step of the upper surface of the flange portion 31 and the lower surface of the lid member 40, as shown in FIG. The narrow R convex portion a of the heat fusion convex streak 2 having the flat portion b is firmly heat-fused so as to bite into the sealant layer on the lower surface, and at the same time, the flat portion b having a step is changed to the sealant on the lower surface. When lightly heat-sealed to the layer, the outer slope c of the strongly convex R-projection a has a slope angle of 30 degrees or less, so that the sealant layer on the lower surface is broken and the lid material 40 is easy to peel off, and the inclination angle of the inner slope d of the flat portion b that has been lightly heat-sealed is 60 degrees or more. It is found that the lid member 40 is hard to be peeled off, and the sealing with the lid member 40 is performed. And opening property and a, it is possible to provide a better holding plastic tray container simultaneously.
[0014]
In addition, as shown in FIGS. 1B and 1D, the plastic tray container of the present invention has an R convex portion a on the outer surface of the top surface and an R convex portion on the inner surface of the top surface, respectively, on the upper surface of the rectangular ring-shaped flange portion 31 with rounded corners. Two rows of the heat-fused convex bars 2 and 2 having a flat portion b are provided, and the two rows of the heat-fused convex bars 2 and 2 are arranged in one row at the rounded corners of the flange portion 31. It is a plastic tray container characterized by being put together.
[0015]
In the plastic tray container of the present invention, two rows of heat-exchange portions each having an R-convex portion a on the outer side of the top surface and a flat portion b on the inner side of the top surface are provided on the upper surface of the rectangular ring-shaped flange portion 31 with rounded corners. By providing the fusion convex streaks 2, 2, as shown in FIG. 2A, two rows of narrow R convex portions are formed in the above-described heat fusion process between the upper surface of the flange portion 31 and the lower surface of the lid member 40. a, a is firmly heat-fused so that it penetrates the sealant layer on the lower surface, thereby completely preventing the peeling of the lid member 40 due to the above-mentioned impact and internal heat pressure, and simultaneously forming two rows. The flat portions b, b having a step are lightly heat-sealed to the sealant layer on the lower surface to more completely prevent the liquid leakage due to the above-described pinhole or delamination, etc. A plastic tray container that has completely and better sealed It can be provided.
[0016]
Moreover, in the plastic tray container of the present invention, the two rows of the heat-fused convex streaks 2, 2 are arranged in a single row at the rounded corners of the flange portion 31, so that the flange portion 31 is rounded. When pulling the knob 41 of the lid member 40 shown in FIG. 2B provided at a portion corresponding to the corner, the lid member 40 is peeled off and the plastic container 30 is opened, the narrow R-convex portions arranged in one row. By simply peeling off the lid material 40 of the portion that has been firmly heat-sealed so that the portion a bites in, simultaneously peeling off the lid material 40 of the portion where the heat-sealed portion of the flat portion b with the steps arranged in one row is lighter The lid 40 in the portion where the two rows of the heat-fused convex streaks 2, 2 are heat-sealed is easily peeled off one by one, and the plastic container 30 is opened. To provide a plastic tray container with good It is possible.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
1A is a cross-sectional view of a plastic tray container according to an embodiment of the present invention, FIG. 1B is a plan view of a flange portion 31 of the plastic tray container, and FIGS. It is an expanded sectional view.
2A and 2B are enlarged cross-sectional views showing a state in which a lid member 40 is thermally fused to the flange portion 31 of the plastic tray container according to the embodiment of the present invention.
[0018]
That is, on the upper surface of the square (rectangular) ring-shaped 7.4 mm-width flange portion 31 having the rounded corners of the rectangular parallelepiped tray-shaped plastic container 30, the outer side of the top surface is 0.8 mm wide and 0.4 mm wide, respectively. 1B and 2C, two rows of heat-fused convex streaks 2 and 2 having an R convex portion a having a height and a flat portion b having a width of 1.2 mm on the inner side of the top surface are provided. As shown in FIGS. 1B and 1D, the heat-sealing convex streaks 2 and 2 are arranged in a row at the rounded corners of the flange portion 31. The plastic container 30 shown in FIG. 1A is made of polypropylene (J2003GP, Injection molding using a softening point of 125 ° C., manufactured by Idemitsu Petrochemical Co., Ltd.) to form a rectangular parallelepiped tray in which the length, width, and depth of the housing portion is 75 × 75 × 45 mm and the average thickness is 0.6 mm A plastic tray container of the present embodiment was manufactured.
[0019]
Next, beautifully printed stretched polypropylene (OPP, 30 μm) and stretched nylon (ONY) were placed on the upper surface of the flange portion 31 of the plastic container 30 shown in FIG. 1A which contained 220 g of cooked curry soup (for one serving). , 12 μm), polyester with ceramic deposition (PET, 20 μm), and unstretched polypropylene (CPP, 50 μm) having a softening point of 105 ° C. as a sealant layer. In the fusion step, as shown in FIG. 2A, two rows of R convex portions a, 0.8 mm wide and 0.4 mm high are strongly heat-fused so as to bite into the sealant layer on the lower surface. At the same time, two rows of 1.2 mm-wide flat portions b, b are lightened so as to receive the bitten hot-melt sealant layer on the lower surface (the pressure for heat-sealing due to the step of 0.4 mm). Is low ) Heat sealed to and sealed plastic tray container of this embodiment.
[0020]
In the plastic tray container according to the present embodiment, two rows of the heat-fused convex bars 2, 2 provided on the upper surface of the flange portion 31 are arranged so that the two rows of R convex portions a, a bite into the sealant layer on the lower surface. It is possible to completely prevent the lid material 40 from peeling off due to the impact during handling, storage, transportation, etc., or due to the internal heat pressure during heat sterilization, etc. The flat portions b, b are lightly heat-sealed so as to receive the bitten hot-melt sealant layer on the lower surface, and the pinholes and interlayers are firmly hot-sealed to bite. Even if peeling or the like may occur, liquid leakage or the like can be completely prevented. Further, the two rows of the heat-fused convex streaks 2, 1 are formed at the rounded corners of the flange portion 31. The tabs 41 of the lid member 40 shown in FIG. By simply peeling off the heat-sealed portion firmly so that the R convex portions a arranged in one row are cut into the portion, the heat-sealed convex streaks 2, 2 of the two rows are heat-sealed. A plastic tray container capable of simultaneously peeling off the lid member 40 easily and sequentially and easily opening the lid member and maintaining good sealing properties and openability with the lid member 40 was obtained.
[0021]
【The invention's effect】
As described above, in the plastic tray container of the present invention, the plastic tray container of the present invention is formed by injection molding using an appropriate plastic material such as high-density polyethylene or polypropylene for storing cooked foods, cooked rice, desserts, and the like. A plastic tray container 30 having a rectangular parallelepiped tray shape obtained by rolling the above, characterized by the shape of the flange portion 31 capable of simultaneously maintaining the sealing property and the opening property with the lid member 40 satisfactorily. be able to.
[Brief description of the drawings]
1A is a sectional view of a plastic tray container according to an embodiment of the present invention, FIG. 1B is a plan view of a flange portion 31 of the plastic tray container, and FIGS. 1C and 1D are enlarged sectional views of the flange portion 31. FIG.
FIGS. 2A and 2B are enlarged cross-sectional views showing a state in which a lid member 40 is thermally fused to a flange portion 31 of the plastic tray container according to the embodiment of the present invention.
FIG. 3 is a sectional view of a conventional plastic tray container.
FIGS. 4A, 4B and 4C are enlarged sectional views of a flange portion 31 in a conventional plastic tray container.
[Explanation of symbols]
2, 3 ... heat fusion convex streak 4 ... non-heat fusion concave groove 5 ... heat fusion resin piece 30 ... plastic container 31 ... flange portion 40 ... lid material 41 ... knob a ... R convex portion b ... flat portion c ... Outside slope d ... Inside slope

Claims (3)

角を丸めた直方体トレー状のプラスチック容器３０の適宜の蓋材４０を熱融着して密封する角を丸めた長方形リング状のフランジ部３１の上面に、頂面外側にＲ凸部ａと頂面内側に平坦部ｂとを備えた熱融着凸筋２を設けたことを特徴とするプラスチックトレー容器。An R-shaped convex portion a is provided on the upper surface of a rectangular ring-shaped flange portion 31 having a rounded corner, which is sealed by heat-sealing an appropriate lid member 40 of a rectangular parallelepiped tray-shaped plastic container 30 having a rounded corner. A plastic tray container provided with a heat-fused convex streak 2 having a flat portion b on the inner surface. 頂面外側にＲ凸部ａと頂面内側に平坦部ｂとを備えた熱融着凸筋２の外側斜面ｃの傾斜角度が３０度以下で内側斜面ｄの傾斜角度が６０度以上であることを特徴とする請求項１に記載のプラスチックトレー容器。The inclination angle of the outer slope c of the heat-fused convex streak 2 having the R convex portion a on the outer side of the top surface and the flat portion b on the inner side of the top surface is 30 degrees or less, and the inclination angle of the inner slope d is 60 degrees or more. The plastic tray container according to claim 1, wherein: 角を丸めた長方形リング状のフランジ部３１の上面にそれぞれ頂面外側にＲ凸部ａと頂面内側に平坦部ｂとを備えた、２列の熱融着凸筋２、２を設けて、この２列の熱融着凸筋２、２を、フランジ部３１の丸みがある角隅で１列にまとめたことを特徴とする請求項１又は請求項２に記載のプラスチックトレー容器。On the upper surface of the rectangular ring-shaped flange portion 31 with rounded corners, two rows of heat-fused convex bars 2, 2 each having an R convex portion a on the outer side of the top surface and a flat portion b on the inner side of the top surface are provided. The plastic tray container according to claim 1 or 2, wherein the two rows of the heat-fused convex bars (2, 2) are arranged in a single row at the rounded corners of the flange portion (31).
JP2002269626A 2002-09-17 2002-09-17 Plastic tray container Expired - Fee Related JP4269609B2 (en)

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JP7384203B2 (en) 2019-06-21 2023-11-21 株式会社村田製作所 Electronic component storage container, electronic component chain, manufacturing method of electronic component storage container, and manufacturing method of electronic component chain
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WO2023047085A1 (en) * 2021-09-23 2023-03-30 Par-Pak Europe Limited Base structure, kit of parts and a method
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WO2024147298A1 (en) * 2023-01-05 2024-07-11 東洋製罐グループホールディングス株式会社 Easy-open package

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