JPH03148450A - Food packaging container and manufacture thereof - Google Patents
Food packaging container and manufacture thereofInfo
- Publication number
- JPH03148450A JPH03148450A JP28081589A JP28081589A JPH03148450A JP H03148450 A JPH03148450 A JP H03148450A JP 28081589 A JP28081589 A JP 28081589A JP 28081589 A JP28081589 A JP 28081589A JP H03148450 A JPH03148450 A JP H03148450A
- Authority
- JP
- Japan
- Prior art keywords
- container
- film
- shrink film
- printed
- container body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 title claims description 27
- 235000013305 food Nutrition 0.000 title claims description 16
- 229920006300 shrink film Polymers 0.000 claims abstract description 44
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 19
- 229920003023 plastic Polymers 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 238000010411 cooking Methods 0.000 abstract description 3
- 230000001954 sterilising effect Effects 0.000 abstract description 3
- 238000004659 sterilization and disinfection Methods 0.000 abstract description 3
- 238000007639 printing Methods 0.000 description 18
- 239000010410 layer Substances 0.000 description 13
- 229920005989 resin Polymers 0.000 description 12
- 239000011347 resin Substances 0.000 description 12
- 230000001070 adhesive effect Effects 0.000 description 10
- 239000000853 adhesive Substances 0.000 description 9
- 238000003466 welding Methods 0.000 description 6
- 239000004743 Polypropylene Substances 0.000 description 5
- -1 polypropylene Polymers 0.000 description 5
- 229920001155 polypropylene Polymers 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 230000004927 fusion Effects 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 3
- 238000007666 vacuum forming Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 2
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 2
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000005033 polyvinylidene chloride Substances 0.000 description 2
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 2
- 241000219122 Cucurbita Species 0.000 description 1
- 235000009852 Cucurbita pepo Nutrition 0.000 description 1
- 229920006257 Heat-shrinkable film Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007499 fusion processing Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 235000021485 packed food Nutrition 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920006289 polycarbonate film Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
Landscapes
- Labeling Devices (AREA)
- Details Of Rigid Or Semi-Rigid Containers (AREA)
Abstract
Description
［産業上の利用分野］
本発明は、レトルト食品などの包装に使用し、側面に凹
部形状を有する容器に、該容器側面形状にそって印刷を
有する収縮フィルムを付した食品包装容器及びその製造
方法に関する。[Industrial Field of Application] The present invention relates to a food packaging container used for packaging retort foods, etc., in which a shrink film having a print along the side surface shape of the container is attached to the container having a concave shape on the side surface, and the production thereof. Regarding the method.
従来より、包装容器に食品を入れたままで、加熱殺菌及
び加熱調理できる容器に入れた商品包装体などが知られ
ている。
一般に、食品包装容器のスーパ一等での陳列販売におい
て、消費者から見て、最も目立つ容器側面に印刷を施工
することは該包装食品の販売促進の上から重要である。
通常、これらの食品包装容器は、真空成形、圧空成形、
中空成形及び射出成形などで成形されるが、真空成形及
び圧空成形で製造する場合でも、原材料シートに最初か
ら印刷をしておくことは、成形時に印刷模様が大きく変
形するので不可能である。
まず、容器の側面に紙ラベルを貼付する方法も知られて
いるが、これらの包装体を加熱殺菌又は加熱調理などに
おいて、熱水又は水がかかるとと −も多く耐水性の低
い印刷紙は破れたり濡れて清潔感を損なう欠点がある。
そこで、成形後の容器側面に印刷する方法としては、第
一に容器側壁に曲面印刷する方法があり、第二に印刷さ
れた収縮フィルムを接着剤で容器側面に接着してから加
熱して、フィルムの収縮力と接着剤の接着力で固定する
方法がある。
第一の方法は、側面に凹部がある容器では、凹部自面に
印刷を施工することが困難という欠点があり、その上、
印刷インキの耐熱性や欠如、印刷手段に起因する多色印
刷の困難性があり、高級感のある印刷が得られない欠点
があある。第二の方法は、接着剤が加熱により接着力を
失い、加熱中にフィルムが特に凹部から離脱する欠点が
あり、また、凹部まで収縮フィルムを密着させることが
できない欠点もある。
【発明が解決しようとする課題１
本発明は、美麗な印刷側面を有し、熱収縮のための加熱
、加熱殺菌若しくは加熱調理等の加熱処理にか１すても
、美麗な印刷側面を維持できる食品包装容器及びその製
造方法を提供することを目的とするものである。
［課題を解決するための手段］
本発明者らは、凹部のある側面を有する容器の場合は、
印刷付き収縮フィルムにより印刷側面を有する容器を製
造する方法においては、通常の熱収−では、凹部では収
縮フィルムが浮き上がり、表面と接触し、なくなる欠点
を解決するため、熱収縮魁理の前に、凹部の最深部にお
いて容器壁と収縮フィルムを超音波融着により融着固定
しておけば、印刷付き収縮フィルムは容器側面全面に密
着して被覆され、美麗な熱に強い印刷側面が得られるこ
とを見出し、この知見に基づき本発明を完成するに至っ
た。
すなりも、本発明は、側面に凹部を有するプラスチック
製容器であって、該側面上に密着させた印刷付き収縮フ
ィルムを該側面凹部の最深部において融着固定した構造
を有することを特徴とする食品包装容器、並びに、側面
に凹部を有するプラスチック製容器の側面に、該側面の
高さにほぼ等しく、該側面の周囲の長さよりやや長い寸
法の円筒形状の印刷付き収縮フィルムを巻き付け、該容
器の側面凹部の最深部において、該容器側壁と収縮フィ
ルムを超音波シーラー若しくは高周波シーラーにより融
着固定し、ついで、加熱により収縮フィルムを収縮させ
て該容器側面に固定することを特徴とする食品包装容器
の製造方法を提供するものである。
本発明容器本体の材質として用いる樹脂は、収縮フィル
ムの熱収縮温度に耐える熱可量性樹脂であれば、特に制
限はなく、例えば、ポリプロピレン、ポリエチレン、ポ
リスチレン、ポリエステル、ポリアミド、ポリカーボネ
ート、塩化ビニル系貢脂、ポリ塩化ビニリデン、エチレ
ン酢酸ビニル共重合体ケン化物などのシート及びこれら
の樹脂の多層積層シートを使用することができる。
多層シートとする場合は、内層に、エチレン酢酸ビニル
共重合一体ケン化物、ポリ塩化ビニリデンなどのガスバ
リヤ性樹脂層又はアルミニウムなどの金属フィルム層を
有する積層シートを使用することができる。
本発明本体容器の樹脂層又は多層シートの場合の最外層
の樹脂層は、本発明製造方法で使用する印刷付き収縮フ
ィルムと超音波シール又は高周波シールにより融着し得
る材質である必要がある。
そのためには、収縮フィルムと容器側面層と同一の樹脂
であるのが望ましい。
本発明製造方法に用いる円筒形状の印刷付き収縮フィル
ムは、容器本体の側面と同様の樹脂、例えば、ポリプロ
ピレンフィルム、ポリカーボネートフィルム、ポリエス
テルフィルム、塩化ビニル樹脂フィルムなどを使用する
ことができる。
本発明製造方法では、これらのフィルムを一軸延伸又は
二軸延伸工程により熱収縮性を付与したものを使用する
ことができる。
特に、−軸鈑伸フィルムの延伸方向を円周方向に一致さ
せて円筒形状フィルムを形成するのが、該フィルムを容
器側面に巻き付けたときの弛みを除去する点から効果的
であり、望ましい。
本発明製造方法に用いる熱収縮フィルムは、前以て印刷
されていて、本発明ではこの印刷面を容器側面に向けて
固定する場合及び印刷面を表にして固定する場合のいず
れの方法も適用することができる。
印刷面を裏にして使用する方が、印刷の安定性、清潔感
及び印刷インキの容器側面との接着作用も期待でき望ま
しい。
本発明製造方法に用いる収縮フィルムは、円筒形状にし
て使用する。
この円筒形状フィルムは、容器本体に巻き付ける前に円
筒形状に形成するのが操作上は便利であるが、長方形の
収縮フィルム片を容器本体の側面に巻き付けて、容器本
体上で円筒形状に形成することもできる。この場合、容
器本体側面の凹部の最深部で収縮フィルム片の両端を重
合して、該重合部分を容器本体とともに融着すれば、融
着工程が１回に節約できるとともに融着部分が凹部の余
り目立たない所に隠れるので便利である。
本発明製造方法に用いる筒状収縮フィルムの寸法は容器
本体の寸法に応じて選択することができる。
筒状フィルムの高さは、容器本体の側面の高さとほぼ同
一にするのが普通であるが、所望の高さを選択すること
ができる。
また、場合によっては、容器本体の底の周囲まで収縮フ
ィルムがかかるように円筒形状の高さを大きくするのも
体裁上好ましい。
本発明製造方法に用いる筒状フィルムの円周長さは、容
器本体の外側面の最大円周長さの１０２〜１１０％にす
ることができる。
この寸法が短すぎると、あらかじめ形成した円筒形状フ
ィルムを容器本体に嵌め込む操作及び長方形フィルムを
容器本体上に重ね合わせる操作が困難となり、この寸法
が長ずざると、熱収縮工程において印刷が変形する。
本発明製造方法に用いる収縮フィルムの収縮率は、９０
〜１２０℃程度の処理温度における収縮率が５〜５５％
、好ましくは、１０〜５０％のものが好適に使用できる
。収縮率が低いと、容器本体と収縮フィルムの密着が不
十分となり、印刷の美観が損なわれる。
また、容器本体の周長に対する収＠フィルムの寸法の余
裕がなくて、収縮率が高すぎると、容器本体が変形する
恐れがある。
本発明製造方法が適用される側面に凹部を有する容器本
体は、例えば、第１図の底面図に示すような容器収納部
がハート型の形状であるもの、又は第６図の側面図に示
すように、ひょうたんをの側面図のものがあり、本発明
はこれに限らず、側面に縦横斜めに種々の形状の凹部が
１又は２以上ある容器に適用することができる。
本発明製造方法の一例を第１図のハート型容器の場合に
ついて、さらに詳細に説明する。
第１図の底面図及び第２図の側面図で示されるハート形
状の容器本体ｌＯは側面の高さ２２厘胃であり、底面で
のハート型形状は第１図のＡＢ間の長さ６２ｍ１１で、
ＣＤ間の長さ４８ｓｔ厘であり、ＥＦ −間の長さは
３３ｍ肩であり、ＤＦ間の長さは５８層厘である。上縁
フランジ部分の収納部分では、底面のＡＢ相当のＡ Ｂ
間６７層層であり、他の寸法はこの割合で増加して底面
と相似形のハート型になっている。
この容器本体の側面の外周の長さは、フランジ直下で１
０４ｍ１ｗであり、底面では９２＋＋＋＋ｗである。
そして収納部分の上面には、蓋部と接合のためのフラン
ジ部Ｈを設けである。
このハート型のビール式食品容器本体の材質は、厚さ０
６＋ｕ＋のポリプロピレン／エチレン酢酸ビニル共重合
体ケン化物／ポリプロピレンの３層積層シートからなり
、この３層積層シートを真空成形して第１〜２図の容器
本体を製造することができる。
別に、厚さ５０μで、寸法２２Ｘ１１２履履の長方形の
ポリプロピレンフィルムであって、１００℃における収
縮率３０％の一軸延伸フィルムに所定の印刷したもので
、第３図の筒形状に形成して、両端を４履１重ね合せて
、重ね合せ部分２１を熱シールして外周の長さを１０８
層温の筒状フィルム２０を作製した。
この筒状フィルム２０は廻伸方向は筒状の円周方向に合
わせて作製しであるので熱収縮は主として円周が縮小す
る方向に起こる。
ＭＩＦすの容器本体をコンベア上に下向きに伏せて連続
的に供給して、ハート型の凹部を機械的に検知して一定
の方向にして、ハート型の最深部ＣＣ１線が超音波シー
ラーに対向するように設置し、これに上記収縮フィルム
の接合融着部分２１がちょうど前記凹部のＣＣ″線上に
くるように容器本体１Ｇにかぶせる。
ついで、超音波により、収縮アイ、ルムの接合部分２１
と容器本体の最深ｓｃｃ線とを融着させてから、超音波
シーラかも容器を外し、ついで、これに加熱トンネルに
コンベアで導入して、熱風で収縮フィルムを加熱して収
縮させ容器本体に印刷フィルムを密着させて第４図の断
面構造に示す印刷付き包装容器を製造できる。
上記の通り、本発明製造方法は、側面に凹部を有する容
器本体の側面に前以て印刷された収縮フィルムを巻き付
け、該凹部分の最深部の位置で超音波シーラ若しくは高
周波シーラを用いて、収縮フィルムと容器本体最深部を
融着させる第一工程及びこれを加熱して収縮フィルムを
収縮する第二工程からなるる。
ここに融着手段として、使用する超音波融着又は高周波
融着は、収縮フィルムに適用する場合に熱収縮を余り起
こさない点で本発明製造方法に最適である。また、高周
波融着は、特に塩化ビニル樹脂フィルム６を使用した場
合に使用することができる。
熱収縮工程においては、フィルムの収縮力が一箇所に、
例えば、フィルムの接合部分に、集中して容器が部分的
に変形することが多い、この変形を避けるために、容器
本体の外側面又は収縮フィルムの内面−；、該収縮フィ
ルムの収縮温度程度、例えば、８Ｇ−１００℃程度で接
着力が表れる感熱接着剤、例えば、ロジン、ロジン誘導
体、ピネン系樹脂、石油樹脂、低分子量ポリオレアイン
、クリスタルワックスなどをコーティングしておくと、
円筒形状フィルムの容器本体への装着操作時には接着性
はないが、加熱収縮の際に容器本体の表面全体にフィル
ムが接着して収縮緊縮力が外側面全体に分散して容器が
変形を防止する効果がある。その上、超音波シール又は
高周波シールの場合、融着させる樹脂層の間に、該接着
剤層が介在しても、これが融着なさまたげないので、凹
部の最深部での融着強度を低下させない点でも好都合で
ある。
収縮フィルムの印刷面積が多いときは、円筒形状の内面
に印刷にすることによっても、印刷インキ層が感熱接着
剤的に作用して、前記収縮緊縮力の分散の役割を果たす
ので便利である。また、この効果を助長するために、印
刷インキに積極的に感熱接着剤を添加したものを使用す
ることができる。
このようにして製造された第４図の容器は、内部に食品
を収納して、下落のフランジ部ＨにＭフィルムを接合し
て、密封包装し、これを加熱殺菌してそのまま運送、陳
列販売することができる。
本発明を適用できる側面に凹部を有する容器として、第
５図底面図のような四つ葉型のように凹部が側面の４箇
所Ｃ２、Ｃ３、Ｃ４、Ｃ５にあるものにも適用すること
ができる。この場合は、各凹部分量深部は４箇所あり、
それぞれの位置において、超音波シールによって、フラ
ンジ部の直下から底面まで、円筒形状収縮フィルムを容
器側面に融着固定して、その他の工程は第１図のハート
型容器本体の場合と同様にして製造できる。
また、第６即側面図のような中央が（びれた凹部側面を
有する容器本体の場合も、同様に中央の凹部の凹部最深
ＩＣＣ６の円周に印刷付き収縮フィルムを融着して本発
明製造方法を実施することができる。
さらに、鯖）面側面図のように、円筒形容器本体の側面
の上縁及び下縁近くに水平に２本の浅い凹部分Ｃ７、Ｃ
８を設け、この部分の最深ｓＣ７、Ｃ８に同様の融着工
程及び収縮工程を施工すれば、非常に、強固に印刷フィ
ルムを容器側面に固定することができる。
また、第６図と第７図のような側面に水平な凹部を有す
る容器本体に本発明製造方法を適用するときは、一軸延
伸収縮フィルムの延伸方向を上下方向にしたり、若しく
は、二軸延伸した収縮フィルムを好適に使用することも
できる。
［発明の効果］
本発明食品包装容器及び本発明製造方法は、鮮明な印刷
を容器側面に施工することができる利点があり、しかも
、加熱殺菌又は加熱調理にかけても、印刷フィルムが剥
離しないという高度の耐熱水性のある印刷側面が得られ
る利点がある。
そして、本発明製造方法は連続工程により実施できるの
で生産効率も高い。2. Description of the Related Art Conventionally, there have been known product packages in which food can be heated and sterilized and cooked while still being contained in the packaging container. Generally, when food packaging containers are displayed and sold in first-class supermarkets, it is important to print on the side of the container, which is most noticeable from the consumer's perspective, from the standpoint of promoting sales of the packaged food. Usually, these food packaging containers are made by vacuum forming, pressure forming,
It is formed by blow molding, injection molding, etc., but even when manufacturing by vacuum forming or pressure forming, it is impossible to print on the raw material sheet from the beginning because the printed pattern will be significantly deformed during molding. First, a method of pasting a paper label on the side of the container is known, but when these packages are heat sterilized or cooked, they are exposed to hot water or water. It has the disadvantage that it gets torn or gets wet, impairing the cleanliness. Therefore, as a method of printing on the side of the container after molding, there is a first method of printing a curved surface on the side wall of the container, and a second method is to adhere the printed shrink film to the side of the container with adhesive and then heat it. There is a method of fixing using the shrinkage force of the film and the adhesive force of the adhesive. The first method has the disadvantage that it is difficult to print on the surface of the recess for containers with recesses on the sides;
There are drawbacks such as difficulty in multicolor printing due to the lack of heat resistance of the printing ink and the printing method, and the inability to obtain high-quality printing. The second method has the drawback that the adhesive loses its adhesive strength due to heating, and the film particularly separates from the recesses during heating, and also has the drawback that the shrink film cannot be brought into close contact with the recesses. Problem 1 to be Solved by the Invention The present invention has a beautiful printed side surface, and maintains the beautiful printed side surface even when subjected to heat treatment such as heating for heat shrinkage, heat sterilization, or heat cooking. The purpose of the present invention is to provide a food packaging container and a method for manufacturing the same. [Means for Solving the Problems] In the case of a container having a side surface with a concave portion, the present inventors have found that:
In the method of manufacturing containers with printed sides using a printed shrink film, in order to solve the problem that during normal heat shrinkage, the shrink film rises in the recesses and comes into contact with the surface, it disappears. If the container wall and shrink film are fused and fixed at the deepest part of the recess using ultrasonic welding, the printed shrink film will tightly cover the entire side surface of the container, resulting in a beautiful printed side surface that is resistant to heat. Based on this finding, the present invention was completed. The present invention is also a plastic container having a recessed side surface, characterized by having a structure in which a printed shrink film tightly adhered to the side surface is fused and fixed at the deepest part of the side recessed portion. Wrap a printed shrink film in a cylindrical shape with dimensions approximately equal to the height of the side surface and slightly longer than the circumference of the side surface around the side surface of a food packaging container and a plastic container having a recess on the side surface. A food product characterized in that the container side wall and the shrink film are fused and fixed by an ultrasonic sealer or a high frequency sealer at the deepest part of the side recess of the container, and then the shrink film is contracted by heating and fixed to the container side surface. A method for manufacturing a packaging container is provided. The resin used as the material for the container body of the present invention is not particularly limited as long as it is a thermoplastic resin that can withstand the heat shrinkage temperature of the shrink film, and examples include polypropylene, polyethylene, polystyrene, polyester, polyamide, polycarbonate, and vinyl chloride. Sheets of polyvinyl chloride, polyvinylidene chloride, saponified ethylene-vinyl acetate copolymers, and multilayer laminated sheets of these resins can be used. In the case of a multilayer sheet, a laminated sheet having an inner layer of a gas barrier resin layer such as a monolithically saponified ethylene vinyl acetate copolymer, polyvinylidene chloride, or a metal film layer such as aluminum can be used. The resin layer of the main container of the present invention or the outermost resin layer in the case of a multilayer sheet must be made of a material that can be fused to the printed shrink film used in the manufacturing method of the present invention by ultrasonic sealing or high frequency sealing. For this purpose, it is desirable that the shrink film and the container side layer be made of the same resin. The cylindrical printed shrink film used in the production method of the present invention can be made of the same resin as the side surface of the container body, such as polypropylene film, polycarbonate film, polyester film, vinyl chloride resin film, etc. In the production method of the present invention, it is possible to use these films that have been imparted with heat shrinkability through a uniaxial or biaxial stretching process. In particular, it is desirable to form a cylindrical film by aligning the stretching direction of the -axis sheet-stretched film with the circumferential direction, since this is effective in eliminating slack when the film is wound around the side surface of the container. The heat-shrinkable film used in the manufacturing method of the present invention is printed in advance, and in the present invention, both methods of fixing with the printed side facing the side of the container and fixing with the printed side facing up are applicable. can do. It is preferable to use the printing surface with the printing side facing down, as this can improve printing stability, cleanliness, and adhesion of the printing ink to the side of the container. The shrink film used in the production method of the present invention is used in a cylindrical shape. It is operationally convenient to form this cylindrical film into a cylindrical shape before wrapping it around the container body, but it is also convenient to form it into a cylindrical shape on the container body by wrapping a rectangular piece of shrink film around the side of the container body. You can also do that. In this case, by overlapping both ends of the shrink film pieces at the deepest part of the recess on the side of the container body and fusing the overlapping part with the container main body, the welding process can be reduced to one time, and the fused portion can be placed in the recess. It is convenient because it can be hidden in an inconspicuous place. The dimensions of the cylindrical shrink film used in the production method of the present invention can be selected depending on the dimensions of the container body. The height of the cylindrical film is usually approximately the same as the height of the side surface of the container body, but a desired height can be selected. Further, in some cases, it is preferable for aesthetic reasons to increase the height of the cylindrical shape so that the shrink film extends around the bottom of the container body. The circumferential length of the cylindrical film used in the production method of the present invention can be 102 to 110% of the maximum circumferential length of the outer surface of the container body. If this dimension is too short, it will be difficult to fit the preformed cylindrical film into the container body and to overlap the rectangular film onto the container body, and if this dimension is not long, the printing will be distorted during the heat shrinking process. do. The shrinkage rate of the shrink film used in the production method of the present invention is 90
Shrinkage rate is 5-55% at processing temperature of ~120℃
, preferably 10 to 50%. If the shrinkage rate is low, the adhesion between the container body and the shrink film will be insufficient, and the aesthetic appearance of the print will be impaired. Furthermore, if the shrinkage rate is too high because there is not enough margin in the dimensions of the storage film relative to the circumference of the container body, there is a risk that the container body will be deformed. The container body having a concave portion on the side surface to which the manufacturing method of the present invention is applied is, for example, a container body having a heart-shaped container storage portion as shown in the bottom view of FIG. 1, or a container body as shown in the side view of FIG. There is a side view of a gourd as shown in FIG. An example of the manufacturing method of the present invention will be described in more detail with respect to the case of the heart-shaped container shown in FIG. The heart-shaped container main body lO shown in the bottom view of FIG. 1 and the side view of FIG. in,
The length between CDs is 48st, the length between EF and - is 33m, and the length between DF is 58st. In the storage part of the upper edge flange part, A B equivalent to AB on the bottom
There are 67 layers in between, and the other dimensions increase at this rate to form a heart shape similar to the bottom surface. The length of the outer circumference of the side surface of this container body is 1
04m1w, and 92++++w at the bottom. A flange portion H for connection with the lid portion is provided on the upper surface of the storage portion. The material of this heart-shaped beer-style food container has a thickness of 0.
It consists of a three-layer laminated sheet of 6+u+ polypropylene/saponified ethylene-vinyl acetate copolymer/polypropylene, and the container body shown in FIGS. 1 and 2 can be manufactured by vacuum forming this three-layer laminated sheet. Separately, a rectangular polypropylene film with a thickness of 50 μm and dimensions of 22×112 mm, uniaxially stretched film with a shrinkage rate of 30% at 100° C. was printed in a prescribed manner, and was formed into the cylindrical shape shown in FIG. Layer 4 shoes on both ends and heat seal the overlapped part 21 to make the outer circumference length 108.
A cylindrical film 20 having a layer temperature was produced. Since this cylindrical film 20 is manufactured so that its stretching direction matches the circumferential direction of the cylindrical shape, heat shrinkage mainly occurs in the direction in which the circumference is reduced. Continuously feed the MIF container body face down on the conveyor, mechanically detect the heart-shaped recess and align it in a certain direction so that the deepest part of the heart-shaped CC1 line faces the ultrasonic sealer. Then, cover the container main body 1G so that the bonded and fused portion 21 of the shrink film is exactly on the CC'' line of the recess. Next, the bonded portion 21 of the shrink eye and lume is sealed using ultrasonic waves.
and the deepest SCC line of the container body, then remove the ultrasonic sealer and the container, and then introduce it into a heating tunnel on a conveyor, heat the shrink film with hot air, shrink it, and print on the container body. By closely adhering the film, a printed packaging container shown in the cross-sectional structure of FIG. 4 can be manufactured. As mentioned above, the manufacturing method of the present invention involves wrapping a pre-printed shrink film around the side surface of a container body having a recessed portion, and using an ultrasonic sealer or high-frequency sealer at the deepest position of the recessed portion. It consists of a first step of fusing the shrink film and the deepest part of the container body, and a second step of heating this to shrink the shrink film. The ultrasonic welding or high frequency welding used here as the welding means is most suitable for the production method of the present invention in that it does not cause much heat shrinkage when applied to a shrink film. Moreover, high frequency fusion can be used especially when the vinyl chloride resin film 6 is used. In the heat shrinking process, the shrinkage force of the film is concentrated in one place.
For example, in many cases, the container is partially deformed concentrated at the joint portion of the film.In order to avoid this deformation, the outer surface of the container body or the inner surface of the shrink film; For example, if you coat it with a heat-sensitive adhesive that exhibits adhesive strength at about 8G-100℃, such as rosin, rosin derivatives, pinene resin, petroleum resin, low molecular weight polyolein, crystal wax, etc.
When the cylindrical film is attached to the container body, there is no adhesive property, but during heat shrinkage, the film adheres to the entire surface of the container body, and the contraction force is distributed over the entire outer surface, preventing the container from deforming. effective. Furthermore, in the case of ultrasonic sealing or high-frequency sealing, even if the adhesive layer is interposed between the resin layers to be fused, this will not prevent fusion and reduce the fusion strength at the deepest part of the recess. It is also advantageous in that it does not allow When the printing area of the shrink film is large, it is convenient to print on the inner surface of the cylindrical shape, since the printing ink layer acts like a heat-sensitive adhesive and plays the role of dispersing the shrinkage force. Moreover, in order to promote this effect, it is possible to use a printing ink to which a heat-sensitive adhesive is actively added. The container shown in Fig. 4 manufactured in this manner stores food inside, attaches M film to the lower flange H, seals it, and sterilizes it by heating, then transports it, displays it, and sells it. can do. As a container having recesses on the side surface to which the present invention can be applied, the present invention can also be applied to a container having recesses at four locations C2, C3, C4, and C5 on the side surface, such as a quatrefoil-shaped container as shown in the bottom view of FIG. can. In this case, there are four deep parts of each recess,
At each position, the cylindrical shrink film was fused and fixed to the side of the container from just below the flange to the bottom using ultrasonic sealing, and the other steps were the same as for the heart-shaped container body in Figure 1. Can be manufactured. In addition, in the case of a container body having a concave side surface with a narrow center as shown in the sixth side view, the present invention can be manufactured by similarly welding a printed shrink film to the circumference of the deepest concave part ICC6 of the central concave part. Further, as shown in the side view of the cylindrical container body, two horizontally shallow recessed portions C7 and C are formed near the upper and lower edges of the side surface of the cylindrical container body.
8 and perform the same fusion process and shrinkage process on the deepest parts sC7 and C8, it is possible to very firmly fix the printing film to the side surface of the container. In addition, when applying the manufacturing method of the present invention to a container body having a horizontal concave portion on the side surface as shown in FIGS. It is also possible to suitably use a shrink film. [Effects of the Invention] The food packaging container of the present invention and the manufacturing method of the present invention have the advantage that clear printing can be applied to the side surface of the container, and in addition, the printing film is highly resistant to peeling even when subjected to heat sterilization or cooking. It has the advantage of providing a printing side that is resistant to hot water. Furthermore, since the manufacturing method of the present invention can be carried out through continuous steps, production efficiency is also high.
第１図は本発明製造方法を適用する容器本体の一例であ
り、第２図はその側面図であり、第３図は本発明製造方
法に使用する印刷付き収縮フィルムの一例であり、第４
図は本発明製造方法により製造される食品包装容器の一
例のハート型容器の凹部の最深部を通る中央対象面で切
断した断面図であり、第５図は本発明製造方法が適用で
きる別の容器本体の底面図であり、第６図は同じく別の
容器本体の側面図であり、第７図は同じく別の容器本体
の側面図である。
図中の符号は、ｌＯ：容器本体、２０：印刷付さ収縮フ
ィルム、２１：フィルム接合融着部、Ｈ：フランジ部、
Ｋ；容器底、Ｃ：凹部最深部の下端、Ｃｏ ：凹部最深
部の上端、０２〜０８：凹部最深部である。FIG. 1 is an example of a container body to which the manufacturing method of the present invention is applied, FIG. 2 is a side view thereof, FIG. 3 is an example of a printed shrink film used in the manufacturing method of the present invention, and FIG.
The figure is a sectional view taken along the central symmetrical plane passing through the deepest part of the recess of a heart-shaped container, which is an example of the food packaging container manufactured by the manufacturing method of the present invention, and FIG. FIG. 6 is a bottom view of the container body, FIG. 6 is a side view of another container body, and FIG. 7 is a side view of another container body. The symbols in the figure are: IO: container body, 20: printed shrink film, 21: film bonding and fusion part, H: flange part,
K: bottom of the container, C: lower end of the deepest part of the recess, Co: upper end of the deepest part of the recess, 02 to 08: deepest part of the recess.
Claims (1)
該側面上に密着させた印刷付き収縮フィルムを該側面凹
部の最深部において融着固定した構造を有することを特
徴とする食品包装容器。 ２ 側面に凹部を有するプラスチック製容器の側面に、
該側面の周囲の長さよりやや長い寸法の円筒形状の印刷
付き収縮フィルムを巻き付け、該容器の側面凹部の最深
部において、該容器側壁と収縮フィルムを超音波シーラ
ー若しくは高周波シーラーにより融着固定し、ついで、
加熱により収縮フィルムを収縮させて該容器側面に固定
することを特徴とする食品包装容器の製造方法。 ３ 収縮フィルムが円筒形状の円周方向に延伸された一
軸延伸フィルムである請求項１記載の食品包装容器の製
造方法。[Claims] 1. A plastic container having a recess on the side surface,
A food packaging container characterized by having a structure in which a printed shrink film tightly adhered to the side surface is fused and fixed at the deepest part of the side recess. 2. On the side of a plastic container with a recess on the side,
Wrap a cylindrical printed shrink film with a dimension slightly longer than the circumference of the side surface, and fuse and fix the container side wall and the shrink film with an ultrasonic sealer or a high frequency sealer at the deepest part of the side recess of the container, Then,
A method for manufacturing a food packaging container, which comprises shrinking a shrink film by heating and fixing it to the side surface of the container. 3. The method for manufacturing a food packaging container according to claim 1, wherein the shrink film is a uniaxially stretched film having a cylindrical shape and stretched in the circumferential direction.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28081589A JP2801690B2 (en) | 1989-10-27 | 1989-10-27 | Food packaging container and method for producing the same |
| US07/546,815 US5078817A (en) | 1989-07-12 | 1990-07-02 | Process for producing printed container for food packaging |
| CA002020670A CA2020670C (en) | 1989-07-12 | 1990-07-06 | Process for producing printed container for food packaging |
| EP90113290A EP0408016B1 (en) | 1989-07-12 | 1990-07-11 | Process for producing printed container for food packaging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28081589A JP2801690B2 (en) | 1989-10-27 | 1989-10-27 | Food packaging container and method for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03148450A true JPH03148450A (en) | 1991-06-25 |
| JP2801690B2 JP2801690B2 (en) | 1998-09-21 |
Family
ID=17630362
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28081589A Expired - Lifetime JP2801690B2 (en) | 1989-07-12 | 1989-10-27 | Food packaging container and method for producing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2801690B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007176515A (en) * | 2005-12-27 | 2007-07-12 | Yoshino Kogyosho Co Ltd | Synthetic resin-made container and method for sheathing with shrink label |
| JP2007216984A (en) * | 2006-02-14 | 2007-08-30 | Fuji Seal International Inc | Manufacturing method for labelled container and labelled container |
| JP2008162667A (en) * | 2006-12-28 | 2008-07-17 | Yoshino Kogyosho Co Ltd | Synthetic resin-made container |
-
1989
- 1989-10-27 JP JP28081589A patent/JP2801690B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007176515A (en) * | 2005-12-27 | 2007-07-12 | Yoshino Kogyosho Co Ltd | Synthetic resin-made container and method for sheathing with shrink label |
| JP2007216984A (en) * | 2006-02-14 | 2007-08-30 | Fuji Seal International Inc | Manufacturing method for labelled container and labelled container |
| JP2008162667A (en) * | 2006-12-28 | 2008-07-17 | Yoshino Kogyosho Co Ltd | Synthetic resin-made container |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2801690B2 (en) | 1998-09-21 |
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