JP2001328617A - Sealed paper tray container and its manufacturing method - Google Patents
Sealed paper tray container and its manufacturing methodInfo
- Publication number
- JP2001328617A JP2001328617A JP2000148931A JP2000148931A JP2001328617A JP 2001328617 A JP2001328617 A JP 2001328617A JP 2000148931 A JP2000148931 A JP 2000148931A JP 2000148931 A JP2000148931 A JP 2000148931A JP 2001328617 A JP2001328617 A JP 2001328617A
- Authority
- JP
- Japan
- Prior art keywords
- paper tray
- heat
- flange
- sealed
- flange portion
- 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
Landscapes
- Containers Having Bodies Formed In One Piece (AREA)
- Making Paper Articles (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、密封型紙トレー容
器およびその製造方法に関するものであり、さらに詳し
くは、フランジ部を平滑な面に形成し、シール蓋を熱シ
ールした密封型紙トレー容器およびその製造方法に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed paper tray container and a method of manufacturing the same, and more particularly, to a sealed paper tray container having a flange portion formed on a smooth surface and a sealing lid heat-sealed, and a sealed paper tray container having the same. It relates to a manufacturing method.
【０００２】[0002]
【従来の技術】従来より、紙を成形して皿状（トレー）
にした容器は、使い捨ての容器として使用されている。
さらに、紙を深く成形した容器、いわゆる深絞り紙トレ
ーも実用化されている。この深絞り紙トレーでは、フラ
ンジ部は、耐熱性のある樹脂からなる熱可塑性樹脂層を
表面に積層した板紙のブランク、あるいはフランジ部に
あらかじめ押し罫を施したブランクを、凹凸の型を用い
て熱と圧力で絞り込むという成形方法で形成していた。2. Description of the Related Art Conventionally, paper is formed into a tray (tray).
The used container is used as a disposable container.
Further, containers formed by deeply forming paper, so-called deep drawn paper trays, have also been put to practical use. In this deep-drawing paper tray, the flange portion is made of a paperboard blank in which a thermoplastic resin layer made of a heat-resistant resin is laminated on the surface, or a blank in which the flange portion is pre-pressed, using an uneven mold. It was formed by a molding method of drawing by heat and pressure.
【０００３】一般的な紙皿（紙トレー）では、絞りが浅
く、成形時に全体的にシワが入りにくく、凹凸の少ない
フランジ部（周辺部）が得られる。しかし、絞りを深く
した場合には、フランジ部３にシワが入りやすく、フラ
ンジ部３の面は凹凸面となってしまい、その状態でシー
ル蓋の熱シールを行っている。[0003] In a general paper plate (paper tray), a flange portion (peripheral portion) having a small aperture, hardly wrinkling as a whole at the time of molding, and having less unevenness is obtained. However, when the diaphragm is deepened, wrinkles are easily formed in the flange portion 3 and the surface of the flange portion 3 becomes an uneven surface. In this state, the sealing lid is heat-sealed.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記の
技術で成形された深絞り紙トレーでは、フランジ部にシ
ール蓋をする場合、成形に伴う絞りシワがフランジ部に
残るため、フランジ部が充分に平滑な面となっていない
ため、シール蓋を行った状態で、紙トレーの中に収納し
た内容物を充分に密封することが難しい。また、ブラン
クの段階でフランジ部に押し罫をあらかじめ施しておい
ても、成形で絞りシワが発生してしまい、シール蓋で熱
シールしても高い密封性を得ることが難しいという問題
があった。However, in the case of a deep drawing paper tray formed by the above technique, when a sealing lid is provided on the flange portion, a draw wrinkle accompanying the forming remains on the flange portion, so that the flange portion is not sufficiently formed. Since the surface is not smooth, it is difficult to sufficiently seal the contents stored in the paper tray with the seal cover in place. Also, even if the flange portion is pre-creased at the blanking stage, draw wrinkles are generated during molding, and there is a problem that it is difficult to obtain high sealing performance even with heat sealing with a seal lid. .
【０００５】これに対して本発明は、上述の従来の深絞
り紙トレー容器の問題を解決したものであり、内面（表
面）に耐熱性のある樹脂からなる熱可塑性樹脂層を積層
し、フランジ部となる領域に予め熱溶融性の樹脂からな
る熱接着層を設けた板紙を主材料とするブランクを深絞
り紙トレーとする成型工程で、そのフランジ部となる部
分を低い温度と圧力を用いて、押しつぶして凹凸の少な
い平滑な面を形成し、後で紙トレーのフランジ部におい
て、シール蓋を熱シールすることによって密封性の高い
シールが可能なフランジ部を有する密封型紙トレー容器
およ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。On the other hand, the present invention solves the above-mentioned problem of the conventional deep drawn paper tray container, in which a thermoplastic resin layer made of a heat-resistant resin is laminated on the inner surface (surface), and a flange is formed. In the molding process of forming a deep drawing paper tray using a blank made mainly of paperboard provided with a thermal adhesive layer made of a heat-meltable resin in advance in a region to be a part, a low temperature and pressure are used for the flange part. A sealed paper tray container having a flange portion capable of forming a smooth surface with less irregularities and subsequently sealing the sealing lid at the flange portion of the paper tray by heat sealing with a high sealing property, and a method of manufacturing the same. It is intended to provide a method.
【０００６】[0006]
【課題を解決するための手段】本発明は、上記のような
課題を解決すべく検討した結果、表面に熱可塑性樹脂層
を積層した板紙を主材料とするブランクの前記熱可塑性
樹脂層を内面側にして成形されたフランジ部を有する紙
トレーと、前記フランジ部に熱シールされるシール蓋と
からなる密封型紙トレー容器であって、前記熱可塑性樹
脂層の樹脂が耐熱性樹脂であり、かつ、前記フランジと
なる部分の表面に予め熱接着層を設けてあることを特徴
とする密封型紙トレー容器を見出し、完成したものであ
る。SUMMARY OF THE INVENTION The present invention has been studied to solve the above-mentioned problems, and as a result, the thermoplastic resin layer of a blank mainly made of paperboard having a thermoplastic resin layer laminated on its surface has an inner surface. A paper tray container having a paper tray having a flange portion molded on the side and a sealing lid thermally sealed to the flange portion, wherein the resin of the thermoplastic resin layer is a heat-resistant resin, and A sealed paper tray container characterized in that a heat bonding layer is provided in advance on the surface of the portion to be the flange, has been completed.
【０００７】また、表面に熱可塑性樹脂層を積層した板
紙を主材料とするブランクの前記熱可塑性樹脂層を内面
側にして成形されたフランジ部を有する紙トレーと、前
記フランジ部に熱シールされるシール蓋とからなる密封
型紙トレー容器の製造方法であって、前記紙トレーを成
形する成形型の上金型（雄型）の少なくとも前記フラン
ジ部と接する部分の温度を前記熱接着層の熱変形温度
（ＪＩＳ Ｋ−７２０７）より１０℃以上低い温度で成
形し、内容物を充填後、前記シール蓋を熱シールするこ
とを特徴とする密封型紙トレー容器の製造方法を見出
し、完成したものである。Also, a paper tray having a flange formed with the thermoplastic resin layer of the blank made of paperboard having a thermoplastic resin layer laminated on the surface as a main material, and a heat-sealed seal on the flange. A method of manufacturing a hermetically sealed paper tray container comprising a sealing lid and a sealing lid, wherein a temperature of at least a portion of the upper mold (male mold) of a molding die for molding the paper tray, which is in contact with the flange portion, is determined by the heat of the thermal bonding layer. After molding at a temperature lower than the deformation temperature (JIS K-7207) by 10 ° C. or more, filling the contents, and then heat-sealing the sealing lid, a manufacturing method of a sealed paper tray container was found. is there.
【０００８】本発明によれば、内面（表面）に耐熱性の
ある樹脂からなる熱可塑性樹脂層を積層し、フランジ部
となる領域に予め熱溶融性の樹脂からなる熱接着層を設
けた板紙を主材料とするブランクを深絞り紙トレーとす
る成型工程で、そのフランジ部となる部分を低い温度と
圧力を用いて、押しつぶして凹凸の少ない平滑な面を形
成し、後で紙トレーのフランジ部において、シール蓋を
熱シールすることによって、成形された紙トレーのフラ
ンジ部の内面が熱変形温度のひくい樹脂からなる熱接着
層であるため、熱シールの時にフランジ部に発生した絞
りシワが潰され、凹凸の間の間隙が埋められて密封性が
高いシールが可能なフランジ部を有する密封型紙トレー
容器を得ることができる。According to the present invention, a paperboard is provided in which a thermoplastic resin layer made of a heat-resistant resin is laminated on the inner surface (surface) and a heat-adhesive layer made of a heat-meltable resin is provided in advance in a region to be a flange portion. In the molding process of forming a deep draw paper tray using a blank as the main material, the flange portion is crushed by using low temperature and pressure to form a smooth surface with little unevenness, and the flange of the paper tray is later formed. In this part, the seal lid is heat-sealed, so that the inner surface of the flange portion of the formed paper tray is a heat bonding layer made of a resin having a low thermal deformation temperature. It is possible to obtain a hermetically sealed paper tray container having a flange portion that is crushed and has a flange portion capable of sealing with a high sealing property by filling a gap between irregularities.
【０００９】[0009]
【発明の実施の形態】以下に、図面を参照しながら、本
発明について、さらに詳しく説明する。本発明のシール
蓋を熱シールすることによる密封性が高いシールが可能
なフランジ部を有する密封型紙トレー容器Ａは、図１に
示すように、紙トレー１とシール蓋２０とからなってお
り、紙トレー１は、内面（表面）にポリプロピレン樹脂
などの耐熱性のある熱可塑性樹脂層が積層され、フラン
ジ部２となる領域１２に予め熱溶融性の熱接着層をもう
けた板紙を主材料とするブランク１１をプレス成形する
ことにより作製されるものである。紙トレー１は、角丸
の四角形の底面４とその外周端に形成された側面３とそ
の側面３の上端の全周に渡って形成された平坦なフラン
ジ部２とからなる深絞りの紙トレーである。四隅の角部
には、プレス成形時に絞られて生じたシワが複数本生じ
た状態となっている。この絞りシワ５はブランクの角部
に予め設けてあった押し罫に沿って発生するものであ
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the drawings. A sealed paper tray container A having a flange portion capable of sealing with high sealing performance by heat sealing the seal lid of the present invention includes a paper tray 1 and a seal lid 20, as shown in FIG. The main material of the paper tray 1 is a paperboard in which a heat-resistant thermoplastic resin layer such as a polypropylene resin is laminated on the inner surface (surface) and a heat-melting heat-bonding layer is previously provided in a region 12 to be the flange portion 2. It is manufactured by press-forming a blank 11 to be formed. The paper tray 1 is a deep drawing paper tray comprising a rounded rectangular bottom surface 4, a side surface 3 formed on the outer peripheral end thereof, and a flat flange portion 2 formed over the entire periphery of the upper end of the side surface 3. It is. At the corners of the four corners, a plurality of wrinkles generated by squeezing at the time of press molding are generated. The drawing wrinkle 5 is generated along a pressing rule previously provided at a corner of the blank.
【００１０】この紙トレー１の外周には、フランジ部２
を形成しているが、フランジ部２の外周端部をカールし
て、紙トレーとしての保形性をよくすることもできる。
紙トレー１の形状としては、四角形、五角形、六角形、
円形など、フランジ部２を有していればよく、特に形状
については限定されるものではない。A flange 2 is provided on the outer periphery of the paper tray 1.
However, it is also possible to curl the outer peripheral end of the flange portion 2 to improve shape retention as a paper tray.
The shape of the paper tray 1 may be square, pentagon, hexagon,
It is only necessary to have the flange portion 2 such as a circle, and the shape is not particularly limited.
【００１１】上記の紙トレー１をプレス成形で作製する
前のブランク１１は、図２に示すように、角丸の長方形
であり、四隅の角部のフランジ部２となる領域１２ある
いは側面３となる領域１３には、外周端から円弧の中心
に向かって複数の押し罫１５が設けられている。このよ
うに間隔を狭くした複数本の押し罫１５を設けておくこ
とにより、プレス成形時における紙トレー１の角部の絞
り性がよくなり、成形された紙トレー１の保形性をよく
することができる。また、フランジ部２となる領域１２
（網点の部分）には、予め熱溶融性の樹脂を部分的に塗
布して熱接着層を設けている。As shown in FIG. 2, the blank 11 before the above-mentioned paper tray 1 is formed by press molding is a rounded rectangle, and has a region 12 or a side surface 3 which becomes the flange 2 at the four corners. A plurality of press rules 15 are provided in the area 13 from the outer peripheral end toward the center of the arc. By providing a plurality of press rules 15 with such a narrow interval, the drawability of the corners of the paper tray 1 during press forming is improved, and the shape retention of the formed paper tray 1 is improved. be able to. In addition, a region 12 to be the flange portion 2
In the (dotted portion), a heat-meltable resin is partially applied in advance to provide a heat bonding layer.
【００１２】本発明の密封型紙トレー容器Ａの紙トレー
１に使用する材料の構成は、紙を主強度材とし、少なく
とも内面（表面）に熱可塑性樹脂層を有することを基本
としている。The construction of the material used for the paper tray 1 of the sealed paper tray container A of the present invention is based on the fact that paper is used as a main strength material and a thermoplastic resin layer is provided at least on the inner surface (surface).
【００１３】この内面の熱可塑性樹脂層は、内容物の保
護性、特に液状の物質を入れても洩れない機能、また、
成形性、耐熱性などの機能を持っている必要がある。具
体的には、ポリプロピレン（以下ＰＰと略す）、ポリエ
チレンテレフタレート（以下ＰＥＴと略す）、メチルペ
ンテンポリマー（以下ＴＰＸと略す）などがあげられ
る。厚さとしては、１５〜６０μｍの範囲が好ましい。
これらの熱可塑性樹脂は、押し出し加工あるいはラミネ
ート加工によって内面に形成される。The thermoplastic resin layer on the inner surface has a function of protecting the contents, in particular, a function of not leaking even when a liquid substance is put thereinto.
It must have functions such as moldability and heat resistance. Specific examples include polypropylene (hereinafter abbreviated as PP), polyethylene terephthalate (hereinafter abbreviated as PET), and methylpentene polymer (hereinafter abbreviated as TPX). The thickness is preferably in the range of 15 to 60 μm.
These thermoplastic resins are formed on the inner surface by extrusion or lamination.
【００１４】また、ブランク１１においてフランジ部２
となる領域１２に設ける熱接着層に用いる熱溶融性の樹
脂は、セルロース系、ポリ酢酸ビニル系、ポリアクリル
系、ポリオレフィン系、ポリエステル系、ゴム系などの
樹脂である。これらの樹脂を主成分とする溶剤型、エマ
ルジョン型、ホットメルト型のコーティング剤として、
例えば、グラビアコート、スプレーコート（ノズルによ
る）、スクリーン印刷などの方法により部分的に塗布す
る。熱接着層の厚さとしては、１０〜６０μｍの範囲が
好ましい。In the blank 11, the flange 2
The heat-fusible resin used for the heat bonding layer provided in the region 12 to be formed is a resin such as a cellulose-based, polyvinyl acetate-based, polyacryl-based, polyolefin-based, polyester-based, or rubber-based resin. As a solvent-type, emulsion-type, and hot-melt-type coating agent containing these resins as main components,
For example, it is partially applied by a method such as gravure coating, spray coating (using a nozzle), or screen printing. The thickness of the heat bonding layer is preferably in the range of 10 to 60 μm.
【００１５】主強度材となる紙としては、紙トレー１の
成形適性の良いカップ原紙、アイボリー紙、カード紙な
どを使用することが好ましい。坪量は、とくに限定され
ないが、紙トレー１の成形適性上、１６０〜４００ｇ／
ｍ2の範囲がより好ましい。As the paper as the main strength material, it is preferable to use cup base paper, ivory paper, card paper, etc., which are suitable for forming the paper tray 1. Although the basis weight is not particularly limited, 160-400 g /
The range of m 2 is more preferable.
【００１６】紙の外面には、耐水性、耐油性などを持っ
た耐熱性のある樹脂層を設けることもできる。具体的に
は、内面の熱可塑性樹脂層と同様に、ポリプロピレン
（以下ＰＰと略す）、ポリエチレンテレフタレート（以
下ＰＥＴと略す）、メチルペンテンポリマー（以下ＴＰ
Ｘと略す）などがあげられる。厚さとしては、１５〜６
０μｍの範囲が好ましい。これらの熱可塑性樹脂は、押
し出し加工あるいはラミネート加工によって外面に形成
される。A heat-resistant resin layer having water resistance, oil resistance and the like can be provided on the outer surface of the paper. Specifically, similarly to the thermoplastic resin layer on the inner surface, polypropylene (hereinafter abbreviated as PP), polyethylene terephthalate (hereinafter abbreviated as PET), methylpentene polymer (hereinafter abbreviated as TP)
X). The thickness is 15-6
A range of 0 μm is preferred. These thermoplastic resins are formed on the outer surface by extrusion or lamination.
【００１７】全体としての具体的な材料構成としては、
例えば、内面側から、ＰＰ／紙、ＰＥＴ／紙、ＴＰＸ／
紙、ＰＰ／紙／ＰＰ、ＰＥＴ／紙／ＰＥＴ、ＴＰＸ／紙
／ＴＰＸ、ＰＰ／ＰＥ／紙／ポリエチレン（以下ＰＥと
略す）／ＰＰ、ＰＥＴ／ＰＥ／紙／ＰＥ／ＰＥＴ、ＴＰ
Ｘ／ＰＥ／紙／ＰＥ／ＴＰＸなどがあげられる。勿論、
紙の表面あるいは裏面には印刷を施すことができる。As a specific material composition as a whole,
For example, from the inner side, PP / paper, PET / paper, TPX /
Paper, PP / paper / PP, PET / paper / PET, TPX / paper / TPX, PP / PE / paper / polyethylene (hereinafter abbreviated as PE) / PP, PET / PE / paper / PE / PET, TP
X / PE / paper / PE / TPX and the like. Of course,
Printing can be performed on the front or back side of the paper.
【００１８】シール蓋２０としては、紙トレー１の内面
の材料により適宜選定するが、イージーピール性を持つ
ものが好ましい。例えば、ＰＥＴ／ヒートシール剤、Ｐ
Ｐ／ヒートシール剤、ＰＥＴ／ＰＰ／ヒートシール剤、
ＰＥＴ／ＰＥ／ヒートシール剤、ＰＥＴ／ＰＥ／エチレ
ン−酢酸ビニル共重合体のケン化物（ＥＶＯＨ）／ＰＥ
／ヒートシール剤、Ｋコート延伸ナイロン（ＫＯＮ）／
ＰＥ／ヒートシール剤などを使用することができる。The seal lid 20 is appropriately selected according to the material of the inner surface of the paper tray 1, but preferably has an easy peeling property. For example, PET / heat sealant, P
P / heat sealant, PET / PP / heat sealant,
PET / PE / heat sealant, PET / PE / saponified ethylene-vinyl acetate copolymer (EVOH) / PE
/ Heat sealant, K-coated stretched nylon (KON) /
PE / heat sealant or the like can be used.
【００１９】本発明のシール蓋２０による密封性が高い
シールが可能なフランジ部２を有する密封型紙トレー容
器Ａを製造する方法を説明すると、まず、図２に示すよ
うに、ブランク１１を打ち抜き加工で作成する。このブ
ランク１１には、あらかじめシワの入りやすい部分に押
し罫１１を多数本施しておくことが、より成形をしやす
くする。この押し罫１１の加工は、打ち抜き加工と同時
に行うことができる。このブランク１１には、予めフラ
ンジ部２となる領域１２（網点の部分）に熱溶融性の樹
脂を部分的に塗布して熱接着層としている。The method of manufacturing the sealed paper tray container A having the flange portion 2 capable of sealing with the sealing lid 20 according to the present invention will be described. First, as shown in FIG. Create with. It is easier to form the blank 11 in advance by applying a large number of creasing lines 11 to portions where wrinkles are likely to be formed. The processing of the pressing rule 11 can be performed simultaneously with the punching processing. In the blank 11, a heat-meltable resin is partially applied in advance to a region 12 (halftone dot portion) to be the flange portion 2 to form a heat bonding layer.
【００２０】つぎに、本発明の密封型紙トレー容器Ａを
製造するための成形機３０の構成は、図３に示すよう
に、上側プレスヘッド３１と下側プレスヘッド３５を備
え、上側プレスヘッド３１が上下に移動するようになっ
ており、上側プレスヘッド３１には上ヒーター盤３２が
取り付けられ、その上ヒーター盤３２には上金型枠３３
および上金型（雌型）３４が取り付けられている。一
方、下側プレスヘッド３５には下ヒーター盤３６が取り
付けられ、その下ヒーター盤３６には下金型枠３７およ
び下金型（雄型）３８が取り付けられている。上金型３
４は紙トレー１の底面４の外面、側面３の外面およびフ
ランジ部２の外面に一致する形状とされている。Next, as shown in FIG. 3, the configuration of the molding machine 30 for manufacturing the sealed paper tray container A of the present invention includes an upper press head 31 and a lower press head 35, and the upper press head 31 Are moved up and down. An upper heater panel 32 is attached to the upper press head 31, and an upper mold frame 33 is attached to the upper heater panel 32.
And an upper mold (female mold) 34 is attached. On the other hand, a lower heater board 36 is attached to the lower press head 35, and a lower mold frame 37 and a lower mold (male mold) 38 are attached to the lower heater board 36. Upper mold 3
Reference numeral 4 denotes a shape that matches the outer surface of the bottom surface 4, the outer surface of the side surface 3, and the outer surface of the flange portion 2 of the paper tray 1.
【００２１】プレス成形するには、上金型３４の温度を
１５０〜２００℃とするように、上ヒーター盤３２の温
度設定を行う。一方、下金型３８の温度を紙トレー１を
成形する紙トレー１のフランジ部２に設けた熱接着層の
樹脂の熱変形温度（ＪＩＳＫ−７２０７）より１０℃以
上低い温度とするように、下ヒーター盤３６の温度設定
を行う。これらの温度条件のもとに、上側プレスヘッド
３１を上側に移動させた状態で下金型３８の上面に紙ト
レー１の内面すなわちブランク１１の表面の熱可塑性樹
脂層が下面になるように載置して上側プレスヘッド３１
を下側に移動させて、下金型３８と上金型３４間で５〜
１０ｋｇ／ｃｍの圧力でプレスすることにより、順次物
理的に滑らせながら絞り部にシワが発生し金型どおりの
紙トレー形状に成形されるものである。For press molding, the temperature of the upper heater panel 32 is set so that the temperature of the upper mold 34 is set to 150 to 200 ° C. On the other hand, the temperature of the lower mold 38 is set to be lower than the thermal deformation temperature (JIS K-7207) of the resin of the thermal adhesive layer provided on the flange portion 2 of the paper tray 1 for forming the paper tray 1 by 10 ° C. or more. The temperature of the lower heater panel 36 is set. Under these temperature conditions, the upper press head 31 is moved upward and the thermoplastic resin layer on the inner surface of the paper tray 1, that is, the surface of the blank 11 is placed on the upper surface of the lower mold 38 so as to face the lower surface. Place the upper press head 31
Is moved downward, and between the lower mold 38 and the upper mold 34, 5 to
By pressing at a pressure of 10 kg / cm, wrinkles are generated in the drawn portion while physically sliding sequentially, and the paper tray is formed into a paper tray shape according to a mold.
【００２２】また、本発明の密封型紙トレー容器Ａを製
造するための成形機３０の下金型３８においては、紙ト
レー１のフランジ部２と他の部分とを分割してフランジ
部２の金型の温度は紙トレー１のフランジ部２に設けた
熱接着層の樹脂の熱変形温度より１０℃以上低い温度と
し、他の部分の金型の温度は耐熱性のある熱可塑性樹脂
層を溶融しない程度に高い温度に設定することができ
る。このことによって、フランジ部２以外の部分の成形
性をよくすることができる。Further, in the lower mold 38 of the molding machine 30 for producing the sealed paper tray container A of the present invention, the flange 2 of the paper tray 1 and other parts are divided and the metal of the flange 2 is divided. The temperature of the mold is lower than the thermal deformation temperature of the resin of the heat bonding layer provided on the flange portion 2 of the paper tray 1 by 10 ° C. or more, and the temperature of the mold in the other portions is such that the thermoplastic resin layer having heat resistance is melted. The temperature can be set so high that it does not occur. Thereby, the moldability of the portion other than the flange portion 2 can be improved.
【００２３】さらに、成形した紙トレー１に内容物を収
納した後、紙トレー１のフランジ部２でシール蓋２０を
熱シールして密封型紙トレー容器Ａが完成する。この熱
シールの温度は紙トレー１の内面の熱可塑性樹脂の熱変
形温度より高い温度で行い、表面の熱可塑性樹脂層を溶
融させ、発生した絞りシワ５を塞いでいる。Further, after the contents are stored in the formed paper tray 1, the sealing lid 20 is heat-sealed with the flange portion 2 of the paper tray 1 to complete the sealed paper tray container A. This heat sealing is performed at a temperature higher than the thermal deformation temperature of the thermoplastic resin on the inner surface of the paper tray 1 to melt the thermoplastic resin layer on the surface and close the generated wrinkles 5.
【００２４】実際に、シール蓋２０を熱シールする加工
前と加工後の部分断面の比較を図４に示す。ブランク１
１から紙トレー１を成形した後のフランジ部２の一部の
断面状態を図４−ａに示しているが、シワが発生し、こ
の状態では、そのシワの部分はトンネル状となり、この
部分を通って液体の内容物が漏れ出してしまう。一方、
シール蓋２０を熱シールした後の状態での本発明の密封
型密封型紙トレー容器Ａでは、フランジ部２の表面の熱
接着層が熱変形温度の低い樹脂からなっているため、内
容物を収納した後シール蓋２０を熱シールをすることに
よって、図４−ｂに示しているように、発生したシワの
部分の表面が熱で溶融され、そして圧力で潰されること
によって、シワのトンネル状の部分が塞がれ液体が浸透
しなくなるとともに、表面の凹凸が減少する。従って、
シール蓋２０を熱シールすることによって、密封性の良
好な紙トレー容器とすることができる。FIG. 4 shows a comparison of partial cross-sections before and after the heat sealing of the seal lid 20 is actually performed. Blank 1
FIG. 4A shows a cross-sectional state of a part of the flange portion 2 after the paper tray 1 has been formed from FIG. 1, but wrinkles are generated. The contents of the liquid leak out through. on the other hand,
In the hermetically sealed paper tray container A of the present invention after the seal lid 20 has been heat-sealed, since the heat bonding layer on the surface of the flange portion 2 is made of a resin having a low heat deformation temperature, the contents are stored. After that, the sealing lid 20 is heat-sealed, so that the surface of the generated wrinkle is melted by heat and crushed by pressure, as shown in FIG. The portion is blocked and liquid does not penetrate, and the surface irregularities are reduced. Therefore,
By heat sealing the seal lid 20, a paper tray container with good sealing performance can be obtained.
【００２５】[0025]
【実施例】本発明の密封型紙トレー容器の製造方法によ
り製造した密封型紙トレー容器の実施例は、つぎの条件
により作成した。EXAMPLE An example of a sealed paper tray container manufactured by the method for manufacturing a sealed paper tray container of the present invention was prepared under the following conditions.
【００２６】紙トレー容器の仕様 形状 ； 四角形状（フランジ部外寸 １１７ｍｍ×
１５７ｍｍ） 内容量 ； ２２０ｍｌ フランジ部の巾；７ｍｍ 高さ ； ３５ｍｍ 材料構成； （内面）ＰＰ２０μｍ／紙２８０ｇ／ｍ2 熱接着層の樹脂； 大日本インキ化学工業（株）製 Ｄ
Ｘ−９０７ （エチレン酢酸ビニル共重合体が主成分） 図２に示すように、フランジ部２となる領域１２に熱接
着層１８を溶融グラビアコート法により部分的に塗布し
て設けたブランク１１を用いて、成形機の条件として、
上金型の温度を１８０℃とし、下金型の温度を８０℃と
して成形して上記のような仕様の紙トレーを作製した。Specification of paper tray container Shape; square shape (outside dimension of flange: 117 mm ×
(157 mm) Content: 220 ml Flange width: 7 mm Height: 35 mm Material composition: (Inner surface) PP 20 μm / paper 280 g / m 2 Resin for heat bonding layer; D-Nihon Ink Chemical Industry Co., Ltd. D
X-907 (mainly composed of ethylene-vinyl acetate copolymer) As shown in FIG. 2, a blank 11 provided by applying a heat bonding layer 18 partially to a region 12 to be the flange portion 2 by a melt gravure coating method was used. Using, as the conditions of the molding machine,
The temperature of the upper mold was set to 180 ° C., and the temperature of the lower mold was set to 80 ° C., to produce a paper tray having the above specifications.
【００２７】熱シール加工の条件 加熱温度； １５０℃ 加圧力 ； ３５０ｋｇｆ ホールドタイム；０．２秒 シール蓋の仕様 材料構成； ＰＥＴ１２μｍ／ＰＰ５０μｍ／ヒートシ
ール剤（ホットメルト剤）２５ｇ／ｍ2 つぎに、このフランジ部を有する紙トレーに液体を含む
内容物を充填した後、上記の条件で紙トレーのフランジ
部において、シール蓋を熱シールで行い密封した。その
結果、液体の漏れのない密封性の高い製品を作成するこ
とができた。Heat sealing condition Heating temperature: 150 ° C. Pressure: 350 kgf Hold time: 0.2 sec Specifications of seal lid Material composition: PET 12 μm / PP 50 μm / Heat sealant (hot melt agent) 25 g / m 2 After filling the content containing the liquid into the paper tray having the flange portion, the sealing lid was heat-sealed and sealed at the flange portion of the paper tray under the above conditions. As a result, it was possible to produce a product having a high sealing property without liquid leakage.
【００２８】[0028]
【発明の効果】本発明によれば、内面（表面）に耐熱性
のある樹脂からなる熱可塑性樹脂層を積層し、フランジ
部となる領域に予め熱溶融性の樹脂からなる熱接着層を
設けた板紙を主材料とするブランクを深絞り紙トレーと
する成型工程で、そのフランジ部となる部分を低い温度
と圧力を用いて、押しつぶして凹凸の少ない平滑な面を
形成し、後で紙トレーのフランジ部において、シール蓋
を熱シールすることによって、成形された紙トレーのフ
ランジ部の内面が熱変形温度のひくい樹脂からなる熱接
着層であるため、熱シールの時にフランジ部に発生した
絞りシワが潰され、凹凸の間の間隙が埋められて密封性
が高いシールが可能なフランジ部を有する密封型紙トレ
ー容器を得ることができる。According to the present invention, a thermoplastic resin layer made of a heat-resistant resin is laminated on the inner surface (surface), and a heat-adhesive layer made of a heat-meltable resin is provided in advance in a region to be a flange portion. In a molding process where a blank made of paperboard as the main material is used as a deep drawn paper tray, the flange portion is crushed using low temperature and pressure to form a smooth surface with less irregularities, and later the paper tray Since the inner surface of the formed flange portion of the paper tray is a heat bonding layer made of a resin having a low heat deformation temperature by heat sealing the seal lid at the flange portion, the squeezing generated on the flange portion at the time of heat sealing. It is possible to obtain a sealed paper tray container having a flange portion in which wrinkles are crushed and gaps between irregularities are filled and a seal having high sealing performance is provided.
【００２９】すなわち、本発明の密封型紙トレー容器の
製造方法においては、後加工のシール蓋を熱シールする
時にフランジ部に発生した絞りシワの間隙が埋めて密封
性が高めるため、紙トレーの成形においては、紙トレー
の内面の少なくともフランジ部の部分の金型の温度を低
くして金型に密着しないようにしている。That is, in the method of manufacturing the sealed paper tray container of the present invention, the gap between the wrinkles generated in the flange portion when the post-processing sealing lid is heat-sealed is filled to enhance the sealing property. In (2), the temperature of the mold at least at the flange portion on the inner surface of the paper tray is lowered so that the mold does not adhere to the mold.
【００３０】この密封性の高いシールができることによ
って、内容物が液体の商品などを包装することができ
る。また、ガス置換やガスフラッシュに対応ができ、Ｅ
Ｌ（エクステンドライフ）が図れる密封型紙トレー容器
を得ることができる。The production of a seal having a high hermeticity makes it possible to package a product having a liquid content. In addition, it can respond to gas replacement and gas flush.
A sealed paper tray container that can achieve L (extended life) can be obtained.
【図１】本発明の密封型紙トレー容器を示す斜視図であ
る。FIG. 1 is a perspective view showing a sealed paper tray container of the present invention.
【図２】本発明の密封型紙トレー容器の紙トレーのブラ
ンクを示す平面図である。FIG. 2 is a plan view showing a paper tray blank of the sealed paper tray container of the present invention.
【図３】本発明の密封型紙トレー容器の製造方法の紙ト
レーを成形する成形機を示す概略断面図である。FIG. 3 is a schematic sectional view showing a molding machine for molding a paper tray in the method for producing a sealed paper tray container of the present invention.
【図４】本発明の密封型紙トレー容器のフランジ部の部
分断面図である。FIG. 4 is a partial sectional view of a flange portion of the sealed paper tray container of the present invention.
Ａ 密封型紙トレー容器 １ 紙トレー ２ フランジ部 ３ 側面 ４ 底面 ５ 絞りシワ １１ ブランク １２ フランジ部となる領域 １３ 側面となる領域 １４ 底面となる領域 １５ 押し罫 １６ 紙層 １７ 熱可塑性樹脂層 １８ 熱接着層 ２０ シール蓋 ３０ 成形機 ３１ 上側プレスヘッド ３２ 上ヒーター盤 ３３ 上金型枠 ３４ 上金型 ３５ 下側プレスヘッド ３６ 下ヒーター盤 ３７ 下金型枠 ３８ 下金型 A Sealed paper tray container 1 Paper tray 2 Flange 3 Side surface 4 Bottom 5 Wrinkle 11 Blank 12 Area to be a flange 13 Area to be a side 14 Area to be a bottom 15 Crease 16 Paper layer 17 Thermoplastic resin layer 18 Thermal bonding Layer 20 Seal lid 30 Molding machine 31 Upper press head 32 Upper heater panel 33 Upper mold frame 34 Upper mold 35 Lower press head 36 Lower heater panel 37 Lower mold frame 38 Lower mold
フロントページの続き Ｆターム(参考） 3E033 AA10 BA10 BA13 BA14 BA16 BA17 BA18 BA23 BB08 CA07 CA09 DA06 DA08 DD01 FA01 3E075 AA05 AA28 BA30 BB02 CA01 DC18 DC43 DC45 DC46 DD13 DD42 DE25 GA03 Continued on front page F term (reference) 3E033 AA10 BA10 BA13 BA14 BA16 BA17 BA18 BA23 BB08 CA07 CA09 DA06 DA08 DD01 FA01 3E075 AA05 AA28 BA30 BB02 CA01 DC18 DC43 DC45 DC46 DD13 DD42 DE25 GA03
Claims (2)
材料とするブランクの前記熱可塑性樹脂層を内面側にし
て成形されたフランジ部を有する紙トレーと、前記フラ
ンジ部に熱シールされるシール蓋とからなる密封型紙ト
レー容器であって、前記熱可塑性樹脂層の樹脂が耐熱性
樹脂であり、かつ、前記フランジとなる部分の表面に予
め熱接着層を設けてあることを特徴とする密封型紙トレ
ー容器。1. A paper tray having a flange formed with the thermoplastic resin layer on the inner side of a blank made mainly of paperboard having a thermoplastic resin layer laminated on the surface, and a heat-sealed seal on the flange. A sealable paper tray container comprising a seal lid, wherein the resin of the thermoplastic resin layer is a heat-resistant resin, and a heat-adhesive layer is provided in advance on a surface of a portion serving as the flange. Sealed paper tray container.
材料とするブランクの前記熱可塑性樹脂層を内面側にし
て成形されたフランジ部を有する紙トレーと、前記フラ
ンジ部に熱シールされるシール蓋とからなる密封型紙ト
レー容器の製造方法であって、前記紙トレーを成形する
成形型の上金型（雄型）の少なくとも前記フランジ部と
接する部分の温度を前記熱接着層の熱変形温度（ＪＩＳ
Ｋ−７２０７）より１０℃以上低い温度で成形し、内
容物を充填後、前記シール蓋を熱シールすることを特徴
とする密封型紙トレー容器の製造方法。2. A paper tray having a flange formed with the thermoplastic resin layer on the inner side of a blank made mainly of paperboard having a thermoplastic resin layer laminated on the surface, and a heat-sealed seal on the flange. A method of manufacturing a hermetically sealed paper tray container comprising a sealing lid and a sealing lid, wherein a temperature of at least a portion of the upper mold (male mold) of a molding die for molding the paper tray, which is in contact with the flange portion, is determined by the heat of the thermal bonding layer. Deformation temperature (JIS
K-7207). A method for producing a sealed paper tray container, comprising molding at a temperature lower than 10 ° C. or more, filling the contents, and heat-sealing the seal lid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000148931A JP4580505B2 (en) | 2000-05-19 | 2000-05-19 | Method for producing sealed paper tray container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000148931A JP4580505B2 (en) | 2000-05-19 | 2000-05-19 | Method for producing sealed paper tray container |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001328617A true JP2001328617A (en) | 2001-11-27 |
| JP4580505B2 JP4580505B2 (en) | 2010-11-17 |
Family
ID=18654870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000148931A Expired - Fee Related JP4580505B2 (en) | 2000-05-19 | 2000-05-19 | Method for producing sealed paper tray container |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4580505B2 (en) |
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| WO2003101839A1 (en) * | 2002-05-31 | 2003-12-11 | Toppan Printing Co., Ltd. | Drawn paper container and method of manufacturing the paper container |
| EP1818265A2 (en) * | 2006-02-10 | 2007-08-15 | Andre Philip Wilkins | Improvements in or relating to high temperature formed paperboard packing trays for hermetic sealing |
| EP2025605A1 (en) * | 2007-08-14 | 2009-02-18 | Andre Philip Wilkins | Improvements in or relating to high temperature formed paperboard packing trays for hermetic sealing |
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| US8858858B2 (en) | 2002-03-15 | 2014-10-14 | Graphic Packaging International, Inc. | Method of forming container with a tool having an articulated section |
| US8613612B2 (en) | 2002-03-15 | 2013-12-24 | Graphic Packaging International, Inc. | Container having a rim or other feature encapsulated by or formed from injection-molded material |
| US8540111B2 (en) | 2002-03-15 | 2013-09-24 | Graphic Packaging International, Inc. | Container having a rim or other feature encapsulated by or formed from injection-molded material |
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| EP1818265A3 (en) * | 2006-02-10 | 2007-12-12 | Andre Philip Wilkins | Improvements in or relating to high temperature formed paperboard packing trays for hermetic sealing |
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