JP5017844B2 - Retort sterilization method for paper containers - Google Patents
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- JP5017844B2 JP5017844B2 JP2005320326A JP2005320326A JP5017844B2 JP 5017844 B2 JP5017844 B2 JP 5017844B2 JP 2005320326 A JP2005320326 A JP 2005320326A JP 2005320326 A JP2005320326 A JP 2005320326A JP 5017844 B2 JP5017844 B2 JP 5017844B2
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- Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
- Apparatus For Disinfection Or Sterilisation (AREA)
Description
本発明は、紙容器のレトルト殺菌方法に関し、さらに詳しくは、短時間で効率よく殺菌することができ、殺菌後も外観の劣化が少ない、紙を含む積層体で作製される紙容器のレトルト殺菌方法に関するものである。 The present invention relates to a retort sterilization method for a paper container, and more specifically, retort sterilization of a paper container made of a laminate including paper, which can be sterilized efficiently in a short time and has little deterioration in appearance after sterilization. It is about the method.
本明細書において、配合を示す「比」、「部」、「％」などは特に断わらない限り質量基準であり、「／」印は一体的に積層されていることを示す。また、「ＰＥＴ」は「ポリエチレンテレフタレート」、「ＯＰＰ」は「２軸延伸ポリプロピレン」、「ＣＰＰ」は「無延伸ポリプロピレン」、及び「ＨＳ層」は「ヒートシール層」の略語、機能的表現、通称、又は業界用語である。 In the present specification, “ratio”, “part”, “%” and the like indicating the composition are based on mass unless otherwise specified, and the “/” mark indicates that they are integrally laminated. In addition, “PET” is “polyethylene terephthalate”, “OPP” is “biaxially stretched polypropylene”, “CPP” is “unstretched polypropylene”, and “HS layer” is an abbreviation and functional expression of “heat seal layer”, Common name or industry term.
（主なる用途）本発明の紙容器のレトルト殺菌方法で殺菌された紙容器の内容物としては、スープ、カレーなどの食品、ミネラウオーターなどの飲料、消毒薬などの医薬品、糊などの日用品などの液状、粘調状、固形物を含む液状物などで、殺菌時間の長さと殺菌後の外観の悪化を解消したものである。しかしながら、短時間で効率よく殺菌することができ、殺菌後も外観の劣化が少ない用途であれば、特に限定されるものではない。 (Main applications) The contents of paper containers sterilized by the retort sterilization method of the paper container of the present invention include foods such as soup and curry, beverages such as Minerau water, pharmaceuticals such as disinfectants, and daily necessities such as glue. The liquid, viscous, or liquid containing solid matter eliminates the length of sterilization time and deterioration of the appearance after sterilization. However, it is not particularly limited as long as it can be sterilized efficiently in a short time and the appearance is less deteriorated after sterilization.
（背景技術）内容物を主にプラスチック材料を主とする包装材料を用いて、包装した容器を、保存性を高めるために、レトルト殺菌処理が行われてきている。
また、包装材料として、ゲーベルトップタイプやブリックタイプなどの箱型紙容器なども、使用後の廃棄処理の際、焼却も容易であり、また、紙を分離、リサイクルすることも比較的容易であることから、用途も益々拡大している。レトルト殺菌処理では、例えば、１２０〜１３５℃の高温に加熱し、殺菌後に冷却してから取り出す、しかしながら、紙容器では断熱性の高い紙を主体とすることから、冷却に長時間を要し、また、加熱及び冷却には通常蒸気や水を用いるので、該水分が被覆材を透したり、容器の断面部分から吸湿して、剛度が低下したり、変形したり、シワが発生したり、凹凸になったり、外観が著しく劣化しまう欠点があった。
従って、紙容器のレトルト殺菌方法は、短時間で効率よく殺菌することができ、かつ、殺菌後も外観の劣化が少ないことが求められている。
(Background Art) A retort sterilization process has been performed in order to improve the preservability of a packaged container using a packaging material mainly composed of a plastic material.
In addition, box-type paper containers such as the gobeltop type and brick type as packaging materials can be easily incinerated during disposal after use, and it is relatively easy to separate and recycle the paper. As a result, the use is expanding more and more. In the retort sterilization treatment, for example, it is heated to a high temperature of 120 to 135 ° C. and cooled and then taken out after sterilization. However, since the paper container is mainly made of highly heat-insulating paper, it takes a long time for cooling, In addition, since steam and water are usually used for heating and cooling, the moisture penetrates the coating material, absorbs moisture from the cross-section portion of the container, decreases the stiffness, deforms, and generates wrinkles. There were drawbacks in that it was uneven and the appearance was remarkably deteriorated.
Therefore, the retort sterilization method for paper containers is required to be able to sterilize efficiently in a short time and to have little deterioration in appearance even after sterilization.
（先行技術）従来、繊維を主体とした容器の殺菌方法としては、容器に関する臨界温度で加熱および（または）冷却される間、それぞれ容器の加熱および（または）冷却に使用される熱伝達媒体が交換されることを特徴とする方法が知られている（例えば、特許文献１参照。）。しかしながら、加熱工程後、単に空冷するだけであり、レトルト釜の内部の蒸気を強制的に排出しないので、冷却に要する時間は未だに時間がかかるという欠点がある。
また、本出願人も、紙容器用積層体及び紙容器を開示している（例えば、特許文献２〜３参照。）。しかしながら、紙容器の材料に関するもので、レトルト殺菌方法については公知の従来方法であり、殺菌に係わる全時間が長く、また、殺菌後も外観が劣化するという問題点がある。本発明者らは、レトルト殺菌方法そのものも鋭意研究を進め、特に時間のかかる冷却を、蒸気を強制的に排除することで、速やかな空冷状態とすることで、雰囲気温度を７０℃以下できるので、短時間殺菌でき、かつ、殺菌後も外観が劣化しにくい紙容器のレトルト殺菌方法を得ることができた。
(Prior Art) Conventionally, as a method for sterilizing a container mainly composed of fibers, a heat transfer medium used for heating and / or cooling the container is used while being heated and / or cooled at a critical temperature related to the container. A method characterized by being exchanged is known (for example, see Patent Document 1). However, after the heating process, it is merely air-cooled, and the steam inside the retort kettle is not forcibly discharged, so that the time required for cooling still has a drawback.
The applicant also discloses a paper container laminate and a paper container (see, for example, Patent Documents 2 to 3). However, it relates to the material of the paper container, and the retort sterilization method is a known conventional method, and has a problem that the entire time for sterilization is long and the appearance deteriorates after sterilization. The inventors of the present invention have also conducted extensive research on the retort sterilization method itself, and particularly the time-consuming cooling can be carried out by forcibly removing the steam, so that the ambient temperature can be reduced to 70 ° C. or less. Thus, it was possible to obtain a retort sterilization method for paper containers that can be sterilized for a short time and whose appearance is not easily deteriorated after sterilization.
そこで、本発明はこのような問題点を解消するためになされたものである。その目的は、短時間で効率よく殺菌することができ、かつ、殺菌後も外観の劣化が少ない紙容器のレトルト殺菌方法を提供することである。 Accordingly, the present invention has been made to solve such problems. The purpose is to provide a retort sterilization method for a paper container that can be sterilized efficiently in a short time and has little deterioration in appearance after sterilization.
上記の課題を解決するために、請求項１の発明に係わる紙容器のレトルト殺菌方法は、（１）脱気工程と、（２）加圧蒸気による加熱工程と、（３）乾燥工程と、（４）水冷却工程と、からなる蒸気式レトルト殺菌において、前記（３）乾燥工程が、加熱工程の温度及び内圧を保ったまま、排気、空気導入を繰返しながら、蒸気分圧を３０ｋＰａ以上低減させ、１分間以上保持して減圧乾燥する乾燥工程であるように、したものである。 In order to solve the above-described problems, a method for sterilizing a paper container according to the invention of claim 1 includes (1) a degassing step, (2) a heating step using pressurized steam, (3) a drying step, (4) In steam retort sterilization comprising a water cooling step, the partial pressure of steam is reduced by 30 kPa or more while repeating the exhaust and air introduction in the drying step (3) while maintaining the temperature and internal pressure of the heating step. It is made to be the drying process which hold | maintains for 1 minute or more and dries under reduced pressure.
請求項１の本発明によれば、短時間で効率よく殺菌することができ、かつ、殺菌後も外観の劣化が少ない紙容器のレトルト殺菌方法が提供される。
請求項２の本発明によれば、請求項１の効果に加えて、より短時間で効率よく殺菌することができる紙容器のレトルト殺菌方法が提供される。
According to the first aspect of the present invention, there is provided a retort sterilization method for a paper container that can be sterilized efficiently in a short time and has little deterioration in appearance after sterilization.
According to the present invention of claim 2, in addition to the effect of claim 1, a retort sterilization method for a paper container that can be sterilized more efficiently in a shorter time is provided.
以下、本発明の実施形態について、図面を参照しながら、詳細に説明する。
図１は、本発明の紙容器のレトルト殺菌方法を説明する蒸気式レトルト殺菌釜の要部の
断面図である。
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view of the main part of a steam retort sterilization pot for explaining the retort sterilization method for paper containers of the present invention .
（紙容器）本発明の紙容器のレトルト殺菌方法に用いる紙容器としては、紙を基材としプラスチックフィルムや金属箔などを任意に積層した紙容器用積層体なるものであればよい。紙容器の形状は特に限定はされず、例えば、ゲーベルトップタイプやブリックタイプなどの箱型紙容器のほか、丸形、角形などのカップ型紙容器、或いは円筒状または角筒状の紙容器、更にはトレー状の紙容器であってもよい。 (Paper container) The paper container used in the retort sterilization method for a paper container of the present invention may be any paper container that is made of paper as a base material and optionally laminated with a plastic film, metal foil, or the like. The shape of the paper container is not particularly limited. For example, in addition to a box-shaped paper container such as a gobel top type or a brick type, a cup-shaped paper container such as a round shape or a square shape, or a cylindrical or rectangular tube-shaped paper container, A tray-like paper container may be used.
該紙容器は、胴部などの接合部において、特に紙容器の内側に紙の端面が露出する場合は、スカイブ・ヘミング、ヘミング、テープ貼りなどの公知の端面処理方法を用いて、紙の端面を隠し、耐水性や密封性を向上させてもよく、外側の端面処理に関しても、必要に応じて適宜、スカイブ・ヘミングやヘミング等の処理方法を用いてもよい。また、紙容器には、内容物の取出口として、蓋材や、プルタブ形式の開封機構などを容器の形状に応じて適宜に設けることができる。更には、紙容器にレーザー光照射や機械的手段による開封用のハーフカット線もしくはハーフカットのミシン目線などを設けて取り出し口を形成してもよい。 The paper container is a paper end face using a known end face processing method such as skive hemming, hemming, tape sticking, etc., particularly when the end face of the paper is exposed inside the paper container at a joint portion such as a trunk. May be concealed to improve the water resistance and the sealing property, and the outer end face treatment may be appropriately performed by a treatment method such as skive hemming or hemming as necessary. Further, the paper container can be appropriately provided with a lid, a pull tab type opening mechanism, or the like as an outlet for the contents depending on the shape of the container. Furthermore, a paper container may be provided with a half-cut line for opening by laser light irradiation or mechanical means, or a perforated line of half-cut, etc. to form a take-out port.
このような構成を採ることにより、紙容器用積層体の優れた成形性、熱接着性（ヒートシール性）を利用して生産性よく紙容器を製造できると共に、紙容器用積層体の優れた耐熱性、耐水性、耐内容物性などの性能を紙容器に付与することができるので、内容物を安全に密封包装することができると共に、内容物密封後のレトルト殺菌処理を安全に行うことのできる耐熱性、耐水性、耐内容物性などの性能を備えた紙容器を提供することができる。 By adopting such a configuration, a paper container can be produced with high productivity by utilizing the excellent moldability and thermal adhesiveness (heat sealability) of the laminate for paper containers, and the excellent laminate for paper containers can be produced. Performances such as heat resistance, water resistance, and content resistance can be imparted to paper containers, so that the contents can be safely sealed and packaged, and the retort sterilization treatment after the contents are sealed can be safely performed. It is possible to provide a paper container having performance such as heat resistance, water resistance and content resistance.
（紙容器積層体）紙容器用積層体の基材に用いる紙は、密度が０．６０〜１．００ｇ／ｃｍ3程度の範囲であることが、紙容器の成形を良好に行い、且つ、必要な性能を紙容器に付与できると共に、紙面にプラスチックフィルムや金属箔などを押出コートしたり、積層の際に塗布剤などをコートしたり、し易く生産性よく且つ接着性よく積層できる点で適当である。紙の密度が０．６０未満の場合は、紙の繊維間の結合力が弱くなり、紙の層内剥離や割れが発生しやすくなると共に、レトルト殺菌処理を施すと紙の端面からの水分吸収が極端に多くなるため好ましくない。また、密度が１．００ｇ／ｃｍ3を超える場合は、繊維間が締まった状態になり、剛性も強くなり、例えば、紙カップ型の容器を作製する場合、トップカールなどの成形適性が低下し、また、ゲーベルトップタイプやブリックタイプなどの箱型容器の場合は、押し罫の効果が低下し、折り曲げ適性の低下や、箱の起きトルクの増大を生じ、容器の成形適性が低下するため好ましくない。 (Paper container laminate) The paper used for the substrate of the paper container laminate has a density in the range of about 0.60 to 1.00 g / cm 3 , and the paper container is molded well, and In addition to being able to give the required performance to paper containers, it can be easily laminated with good productivity and adhesive properties, such as by extrusion coating a plastic film or metal foil on the paper surface, or coating with a coating agent during lamination. Is appropriate. When the density of the paper is less than 0.60, the bonding force between the fibers of the paper is weakened, and the paper is easily peeled and cracked, and moisture absorption from the end face of the paper when retort sterilization is performed. Is not preferable because of excessively increased. Further, if the density exceeds 1.00 g / cm 3 , the fibers are in a tight state and the rigidity is increased. For example, when a paper cup type container is produced, the formability such as top curl is reduced, Further, in the case of a box-type container such as a gobel top type or a brick type, the effect of the crease is lowered, resulting in a decrease in bending suitability and an increase in the torque generated in the box, which is not preferable because the formability of the container is lowered. .
紙容器用積層体としては特に限定されないが、例えば、ＨＳ層／紙／ＨＳ層、ＨＳ層／紙／ガスバリア層／ＨＳ層、ＨＳ層／紙／ガスバリア層／保護層／ＨＳ層、を基本構成とし、この層構成へは接着力やその他の機能を向上させるための、接着層、プライマ層、コロナ処理などの易接着層及び／又は処理をしてもよい。 Although it is not particularly limited as a laminate for paper containers, for example, HS layer / paper / HS layer, HS layer / paper / gas barrier layer / HS layer, HS layer / paper / gas barrier layer / protective layer / HS layer, etc. In order to improve the adhesive force and other functions, this layer structure may be subjected to an adhesive layer, a primer layer, an easily adhesive layer such as a corona treatment and / or a treatment.
（ガスバリア層）ガスバリヤ層としては、アルミニウム箔などの金属箔のほか、アルミニウムなどの金属、またはシリカ、アルミナ、酸化亜鉛、酸化錫、酸化マグネシウムなどの無機酸化物の蒸着層を延伸ポリエチレンテレフタレートフィルムなどのポリエステルフィルムや、延伸ナイロンフィルムなどのポリアミドフィルムなどに設けた蒸着フィルム、或いはエチレン−ビニルアルコール共重合体フィルム、ポリ塩化ビニリデンフィルム、ポリアクリロニトリルフィルム、ＭＸＤ６（ポリメタキシリレンアジパミド）の延伸フィルムなどのガスバリヤー性フィルムを使用することができ、これらの中から紙容器の用途に応じて適宜選択して使用すればよい。即ち、充填された内容物を電子レンジで再加熱するような用途の紙容器に使用する場合は、上記ガスバリヤー層のうち、アルミニウム箔などの金属箔や金属の蒸着層は不適当であり、その他のシリカやアルミナなどの無機酸化物の蒸着層、または前記ガスバリヤー性フィルムなどから、紙容器の用途に応じて選択すればよい。 (Gas barrier layer) As a gas barrier layer, in addition to a metal foil such as an aluminum foil, a vapor deposited layer of a metal such as aluminum or an inorganic oxide such as silica, alumina, zinc oxide, tin oxide or magnesium oxide is stretched polyethylene terephthalate film or the like Vapor deposition film provided on polyamide films such as polyester film, stretched nylon film, etc., ethylene-vinyl alcohol copolymer film, polyvinylidene chloride film, polyacrylonitrile film, stretched film of MXD6 (polymetaxylylene adipamide) A gas barrier film such as, for example, can be used, and the film can be appropriately selected from these according to the use of the paper container. That is, when using the filled contents in a paper container for reheating in a microwave oven, among the gas barrier layers, metal foils such as aluminum foil and metal vapor deposition layers are inappropriate, What is necessary is just to select according to the use of a paper container from the vapor deposition layer of other inorganic oxides, such as a silica and an alumina, or the said gas barrier film.
（保護層）保護層としては、例えばゲーベルトップタイプやブリックタイプなどの箱型紙容器に成形すると、折り曲げ部やヒートシール部などに金属箔のクラックを生じやすい問題があり、これを防ぐためには金属箔の内側の面に保護層を積層することが好ましく、耐熱性および機械的強度に優れたフィルムを用いることが好ましく、例えば、２軸延伸ポリエチレンテレフタレートフィルム（ＰＥＴフィルム）や２軸延伸ナイロンフィルム（ＯＮフィルム）などを好適に使用することができる。 (Protective layer) As a protective layer, for example, when it is molded into a box-type paper container such as a gobel top type or a brick type, there is a problem that a metal foil is likely to crack in a bent portion or a heat seal portion. A protective layer is preferably laminated on the inner surface of the foil, and a film excellent in heat resistance and mechanical strength is preferably used. For example, a biaxially stretched polyethylene terephthalate film (PET film) or a biaxially stretched nylon film ( ON film) and the like can be suitably used.
（ＨＳ層）ＨＳ層としては、レトルト殺菌に耐える耐熱性を有するポリオレフィン系（ＰＯ系）樹脂などが適用できる。ポリプロピレン系（ＰＰ系）樹脂、高密度ポリエチレン（ＨＤＰＥ）や中密度ポリエチレン（ＭＤＰＥ）などのポリエチレン系（ＰＥ系）樹脂、若しくは、それらのブレンド、共重合樹脂、又は変性樹脂などである。好ましくは、ポリプロピレン系樹脂で、耐熱性の点ではプロピレンのホモポリマーがよいが、押出コート適性やヒートシールなどの熱接着適性を向上させるためには、例えば、プロピレンと、エチレンやブテン−１などのα−オレフィンとの共重合体が適している。 (HS layer) As the HS layer, a polyolefin (PO) resin having heat resistance capable of withstanding retort sterilization can be applied. Polypropylene-based (PP-based) resins, polyethylene-based (PE-based) resins such as high-density polyethylene (HDPE) and medium-density polyethylene (MDPE), or blends, copolymer resins, or modified resins thereof. Preferably, it is a polypropylene-based resin, and a homopolymer of propylene is preferable in terms of heat resistance. However, in order to improve heat adhesion suitability such as extrusion coating suitability and heat seal, for example, propylene, ethylene, butene-1, etc. Copolymers with α-olefins are suitable.
ガスバリヤ層、保護層、ＨＳ層などのの積層方法としては、公知の方法でよく、例えば、２液硬化型ポリウレタン系接着剤などを用いたドライラミネート法、アンカーコート剤を介して押出しコート法やサンドイッチラミネート法などがある。このような構成を採ることにより、紙容器用積層体は、基材の紙を主体に、ガスバリヤ層や保護層が設けられると共に、その最外層と最内層に、ヒートシール性を有し、且つ耐熱性、耐水性、耐内容物性などに優れたＨＳ層が積層され、ガスバリヤー性が付与され、充填された内容物の保存性を向上させることができる紙容器とすることができる。 As a method of laminating the gas barrier layer, the protective layer, the HS layer, etc., a known method may be used. For example, a dry laminating method using a two-component curable polyurethane adhesive, an extrusion coating method using an anchor coating agent, There are sandwich lamination methods. By adopting such a configuration, the laminate for a paper container is mainly provided with a base paper, and a gas barrier layer and a protective layer are provided, and the outermost layer and the innermost layer have heat sealability, and An HS layer excellent in heat resistance, water resistance, content resistance, and the like is laminated, gas barrier properties are imparted, and a paper container that can improve the storage stability of the filled contents can be obtained.
（蒸気式レトルト釜）本発明の紙容器のレトルト殺菌方法に用いる蒸気式レトルト殺菌は、（１）脱気工程と、（２）加圧蒸気による加熱工程と、（３）乾燥工程と、（４）水冷却工程と、からなる。該蒸気式レトルト殺菌は、図１に示すように、紙容器１０を収納し、必要に応じて回転などができる懸架装置を内蔵するレトルト釜１０１と、該レトルト釜１０１に付帯する圧縮空気、冷却水、蒸気、脱気、ドレインなどが制御弁を介して装備されている。なお、公知の種々のセンサー、制御装置、駆動装置などを装備してもよく、本発明の紙容器のレトルト殺菌方法の説明に直接関与しないので図示していない。
(Steam Retort Kettle) The steam retort sterilization used in the paper container retort sterilization method of the present invention comprises (1) a degassing step, (2) a heating step using pressurized steam, (3) a drying step, ( 4) A water cooling step. As shown in FIG. 1, the steam type retort sterilization includes a
（レトルト殺菌方法）本発明の紙容器のレトルト殺菌方法は、（１）脱気工程と、（２）加圧蒸気による加熱工程と、（３）加熱工程の温度及び内圧を保ったまま、排気、空気導入を繰返しながら、蒸気分圧を３０ｋＰａ以上低減させ、１分間以上保持して減圧乾燥する乾燥工程と、（４）水冷却工程と、からなる。なお、（１）脱気工程、（２）加圧蒸気による加熱工程、及び（４）水冷却工程は、公知の方法や公知の条件でよく、詳細な説明を省略する。 (Retort sterilization method) The paper container retort sterilization method of the present invention includes (1) a degassing step, (2) a heating step using pressurized steam, and (3) an exhaust gas while maintaining the temperature and internal pressure of the heating step. The process consists of a drying step in which the vapor partial pressure is reduced by 30 kPa or more while air introduction is repeated , and is kept under pressure for 1 minute or more and dried under reduced pressure, and (4) a water cooling step. In addition, (1) deaeration process, (2) heating process by pressurized steam, and (4) water cooling process may be known methods or known conditions, and detailed description thereof is omitted.
（脱気工程）まず、従来のレトルト殺菌方法を説明する。図２の１点鎖線で示す温度変化線のように、（１）脱気工程は、脱気装置によって脱気され、導入蒸気によって温度約１００℃まで予熱される。 (Deaeration process) First, a conventional retort sterilization method will be described. Like the temperature change line shown by the one-dot chain line in FIG. 2, the (1) degassing step is degassed by the degassing device and preheated to a temperature of about 100 ° C. by the introduced steam.
（加熱工程）（２）加熱工程では加圧蒸気によって、所望の殺菌温度に加熱され、所望の殺菌時間保持して、レトルト殺菌する。該レトルト殺菌は少なくとも内容物が１２１℃、４分間保持するようにすればよいが、殺菌温度及び殺菌時間は内容物や内容物の保存条件などのよって適宜選択すればよい。 (Heating process) (2) In the heating process, the steam is heated to a desired sterilization temperature by pressurized steam, maintained for a desired sterilization time, and sterilized by retort. The retort sterilization may be performed such that at least the contents are held at 121 ° C. for 4 minutes, but the sterilization temperature and sterilization time may be appropriately selected depending on the contents and the storage conditions of the contents.
（冷却工程）（４）冷却工程では、例えば、特表２００１−５０２２７６号公報のように、殺菌が行われた後、容器の冷却時に熱伝達媒体は臨界温度で交換され、空気から水へ交換される方法が開示されている。該方法では加熱工程後、単に空冷するだけであり、レトルト釜の内部の蒸気を強制的に排出しないので、冷却に要する時間は未だに時間がかかっている。 (Cooling step) (4) In the cooling step, for example, as in Japanese Patent Publication No. 2001-502276, after sterilization, the heat transfer medium is exchanged at a critical temperature when the container is cooled, and the air is exchanged from water to water. A method is disclosed. In this method, after the heating step, only air cooling is performed and the steam inside the retort kettle is not forcibly discharged, so that the time required for cooling is still long.
（乾燥工程）そこで、本発明では、（１）脱気工程と（２）加熱工程は同じであるが、冷却工程を乾燥工程と冷却工程に明確に分けて、乾燥工程として、加熱工程の温度及び内圧を保ったまま、排気、空気導入を繰返しながら、蒸気分圧を３０ｋＰａ以上低減させ、１分間以上保持して減圧乾燥するようにしたものである。 (Drying process) Therefore, in the present invention, (1) the deaeration process and (2) the heating process are the same, but the cooling process is clearly divided into the drying process and the cooling process, and the temperature of the heating process is determined as the drying process. And while maintaining the internal pressure, while repeating exhaust and air introduction , the vapor partial pressure is reduced by 30 kPa or more, held for 1 minute or more , and dried under reduced pressure .
（減圧の保持）蒸気分圧の減圧は３０ｋＰａ以上低減させることが好ましく、減圧下での保持時間は１分間以上が好ましい。これ未満の減圧では、温度下降が少なく、また、減圧下での保持時間がは１分間未満では温度下降が充分でない。 (Holding of reduced pressure) It is preferable to reduce the vapor partial pressure by 30 kPa or more, and the holding time under reduced pressure is preferably 1 minute or more. If the pressure is less than this, the temperature drop is small, and if the holding time under pressure is less than 1 minute, the temperature drop is not sufficient.
以下、実施例及び比較例により、本発明を更に詳細に説明するが、これに限定されるものではない。 EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention further in detail, it is not limited to this.
（参考例１）紙容器積層体として、基材の紙に密度が０．９７ｇ／ｃｍ3 で、米坪量が３００ｇ／ｍ2 の紙を用いて、その一方の面（容器の外側となる面）に、水性アンカーコート剤としてポリプロピレン系樹脂エマルジョン〔商品名ケミパールＥＰ１００Ｈ、三井化学（株）製〕を乾燥時の塗布量が２ｇ／ｍ2 となるように塗布、加熱乾燥し、その上にポリプロピレン系樹脂としてエチレン含有量が略５モル％のプロピレン−エチレン共重合体（密度０．９０ｇ／ｃｍ3 、融点１６９℃、ＭＦＲ２０）を厚みが２０μｍになるように押し出しコートし、次いで、もう一方の面（容器の内側となる面）に、水性アンカーコート剤として前記と同じポリプロピレン系樹脂エマルジョンを、乾燥時の塗布量が２ｇ／ｍ2 となるように塗布、加熱乾燥し、この積層体の水性アンカーコート剤塗布面と、別にドライラミネート法で貼り合わせて作製したＯＰＰフィルム（厚み１５μｍ）／接着剤層／アルミニウム箔（厚み７μｍ）／接着剤層／ＰＥＴフィルム（厚み１２μｍ）／接着剤層／ＣＰＰフィルム（厚み６０μｍ）の構成（但し、接着剤層には２液硬化型ポリウレタン系接着剤を使用）の積層フィルムのＯＰＰフィルム面とを、両者の間にポリプロピレン系樹脂層としてエチレン含有量が略５モル％のプロピレン−エチレン共重合体（密度０．９０ｇ／ｃｍ3 、融点１６９℃、ＭＦＲ２０）を厚みが１５μｍになるように溶融押し出しして圧着し、貼り合わせる押し出しラミネート法で貼り合わせて、（外側）ポリプロピレン系樹脂層（厚み２０μｍ）／水性アンカーコート剤／紙（米坪量３００ｇ／ｍ2）／
水性アンカーコート剤／ポリプロピレン系樹脂層（厚み１５μｍ）／ＯＰＰフィルム（厚み１５μｍ）／接着剤層／アルミニウム箔（厚み７μｍ）／接着剤層／ＰＥＴフィルム（厚み１２μｍ）／接着剤層／ＣＰＰフィルム（厚み６０μｍ）（内容物側）の紙容器用積層体を作製した。該紙容器用積層体を用いて、公知のブリックタイプの箱型紙容器を作製し、尚、上記箱型紙容器の容量は３００ｍｌとし、上部シール部は、内容物としてパスタソースを充填した後、その接着面をホットエアで加熱して熱接着し密封した。
該紙容器を群として、図１に示す蒸気式レトルト殺菌釜に装填し、（１）脱気工程は加圧しない１０１℃の蒸気を１０分間導入し、空気を追出し脱気して、（２）加熱工程は２１０ｋＰａに加圧した加熱蒸気を導入し、１２１℃、３０分間保持して殺菌し、（３）乾燥工程は蒸気の導入を停止し、内圧を１８０ｋＰａに低下させて、１０分間保持し、減圧乾燥し、（４）水冷却工程では水に浸漬して冷却した。
( Reference Example 1) As a paper container laminate, a paper having a density of 0.97 g / cm 3 and a basis weight of 300 g / m 2 is used as the base paper, and one side thereof (becomes the outside of the container). Surface), a polypropylene resin emulsion [trade name Chemipearl EP100H, manufactured by Mitsui Chemicals Co., Ltd.] as an aqueous anchor coating agent is applied so that the coating amount when dried is 2 g / m 2 , heat-dried, and As a polypropylene resin, a propylene-ethylene copolymer (density 0.90 g / cm 3 , melting point 169 ° C., MFR20) having an ethylene content of about 5 mol% was extrusion-coated to a thickness of 20 μm, and then the other The same polypropylene resin emulsion as above as an aqueous anchor coating agent is applied to the surface (the inner surface of the container) and dried by heating so that the coating amount when dried is 2 g / m 2. The OPP film (thickness: 15 μm) / adhesive layer / aluminum foil (thickness: 7 μm) / adhesive layer / PET film (thickness: 12 μm) produced by laminating the laminate with the water-based anchor coating agent application surface separately by the dry lamination method ) / Adhesive layer / CPP film (thickness: 60 μm) (However, a two-component curable polyurethane adhesive is used for the adhesive layer) and the OPP film side of the laminated film, a polypropylene resin between them As a layer, a propylene-ethylene copolymer (density 0.90 g / cm 3 , melting point 169 ° C., MFR20) having an ethylene content of about 5 mol% is melt-extruded to a thickness of 15 μm, pressure-bonded, and extruded. Laminated together, (outside) polypropylene resin layer (thickness 20 μm) / water-based anchor coating agent / paper (rice basis weight 00g / m 2) /
Water-based anchor coating agent / polypropylene resin layer (thickness 15 μm) / OPP film (thickness 15 μm) / adhesive layer / aluminum foil (thickness 7 μm) / adhesive layer / PET film (thickness 12 μm) / adhesive layer / CPP film ( A laminate for a paper container having a thickness of 60 μm (content side) was produced. Using the paper container laminate, a known brick-type box-shaped paper container is prepared. The capacity of the box-shaped paper container is 300 ml, and the upper seal portion is filled with pasta sauce as the contents. The bonded surface was heated and bonded with hot air and sealed.
The paper containers as a group are loaded into the steam retort sterilization pot shown in FIG. 1, (1) in the degassing step, steam of 101 ° C. without pressure is introduced for 10 minutes, the air is purged and degassed (2 ) heating step to introduce heated steam pressurized to 210 kPa, 121 ° C., sterilized and held for 30 minutes, (3) drying process stops the introduction of steam, by lowering the internal pressure to 180 kPa, 10 minutes It was held and dried under reduced pressure. (4) In the water cooling step, it was immersed in water and cooled.
（実施例１）（３）乾燥工程を、排気、空気導入を繰返しながら、内圧を１５０ｋＰａに低下させて、１０分間保持し、減圧乾燥する以外は、参考例１と同様にした。 (Example 1) (3) Drying step, exhaust, while repeating the air introduction, by lowering the internal pressure to 150 kPa, and held for 10 minutes, except for vacuum drying were the same as in Reference Example 1.
（比較例１）（３）乾燥工程を行わない以外は、実施例１と同様にした。 (Comparative example 1) (3) It was made to be the same as that of Example 1 except not performing a drying process.
（評価）評価は冷却後に、紙容器を取り出して目視で観察したところ、比較例１では紙
容器の断面部の紙端部に水が浸入して、膨潤し変形して外観が著しく低下していたが、実施例１では紙容器の外観は良好であった。
(Evaluation) After cooling, when the paper container was taken out and observed visually, in Comparative Example 1, water entered the paper edge of the cross-section of the paper container, swelled and deformed, and the appearance was significantly reduced. and although, in the embodiment 1 the appearance of the paper container was good.
１０：紙容器
１０１：レトルト釜
10: Paper container 101: Retort pot
Claims (1)
Priority Applications (1)
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|---|---|---|---|
| JP2005320326A JP5017844B2 (en) | 2005-11-04 | 2005-11-04 | Retort sterilization method for paper containers |
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| JP2005320326A JP5017844B2 (en) | 2005-11-04 | 2005-11-04 | Retort sterilization method for paper containers |
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| JP5192920B2 (en) * | 2008-06-19 | 2013-05-08 | サントリーホールディングス株式会社 | Heating and pressing system |
| JP6687718B2 (en) * | 2016-06-24 | 2020-04-28 | 株式会社アルバック | Sterile liquefied gas manufacturing apparatus and method for manufacturing sterilized liquefied gas |
| JP7401409B2 (en) * | 2020-07-30 | 2023-12-19 | 北越コーポレーション株式会社 | Base paper for paper containers with metal vapor deposition layer |
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| GB1461279A (en) * | 1973-01-29 | 1977-01-13 | Lagarde Ets Joseph | Rapid cooling |
| JP2868010B1 (en) * | 1998-01-28 | 1999-03-10 | 三浦工業株式会社 | Operation control method and device for steam sterilizer |
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