JP2000280378A - Water repellent corrugated fiberboard - Google Patents
Water repellent corrugated fiberboardInfo
- Publication number
- JP2000280378A JP2000280378A JP11095899A JP9589999A JP2000280378A JP 2000280378 A JP2000280378 A JP 2000280378A JP 11095899 A JP11095899 A JP 11095899A JP 9589999 A JP9589999 A JP 9589999A JP 2000280378 A JP2000280378 A JP 2000280378A
- Authority
- JP
- Japan
- Prior art keywords
- water
- repellent
- liner
- water repellent
- cardboard
- 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.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/80—Packaging reuse or recycling, e.g. of multilayer packaging
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、青果物、鮮魚、肉
類、冷凍食品等の包装する段ボール箱の素材に適し、し
かもリサイクル可能な撥水段ボールに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recyclable water-repellent cardboard which is suitable for a material of a cardboard box for packing fruits and vegetables, fresh fish, meat, frozen foods and the like.
【０００２】[0002]
【従来の技術】従来、段ボール箱は輸送用に広く用いら
れているが、青果物、鮮魚、肉類、冷凍食品等の、内容
物が水分を含有する場合、また、鮮度保持のために低温
輸送を必要とし、それによって結露水が発生するおそれ
がある内容物に対しては、撥水性、耐水性が付与された
段ボールが素材として用いられている。このような段ボ
ールとしては、段ボールの表面に溶融ワックスを塗工、
又は、段ボールにワックスを含浸させたものが存在す
る。しかし、このようなワックスが多量に付着した段ボ
ールは、古紙としてリサイクルすることができない。さ
らにこれらが誤って通常の段ボールに混入して古紙とし
て回収されると、再生紙の抄造工程で紙切れが発生した
り、製品に黒いワックスの斑点が現れ商品価値を著しく
落とすという問題が発生した。また、段ボールライナに
ポリオレフィン等の合成樹脂フィルムを貼合したものが
存在する。これらもまた古紙として回収し、パルプの原
料として使用することができず、使用後は焼却や埋立処
分しているのが現状であった。2. Description of the Related Art Conventionally, cardboard boxes have been widely used for transportation. However, when the contents of fruits and vegetables, fresh fish, meat, frozen foods and the like contain moisture, and low-temperature transportation is required to maintain freshness. Corrugated cardboard provided with water repellency and water resistance is used as a material for contents that need to be condensed and that may cause dew condensation. As such a cardboard, the surface of the cardboard is coated with molten wax,
Alternatively, there is a corrugated cardboard impregnated with wax. However, such cardboard to which a large amount of wax has adhered cannot be recycled as waste paper. Furthermore, if these are mixed by mistake into ordinary corrugated cardboard and collected as used paper, there is a problem that paper breakage occurs in the papermaking process of the recycled paper, and black wax spots appear on the product, significantly lowering the commercial value. There is also a cardboard liner in which a synthetic resin film such as polyolefin is bonded. These were also recovered as waste paper and could not be used as raw materials for pulp, and after use they were incinerated or landfilled.
【０００３】そのため、近年、資源リサイクルの気運が
醸成されるにつれ、撥水、耐水機能を有すると共に、使
用後に古紙パルプの原料となり、リサイクル利用が可能
な種々の段ボールが提案されている。例えば合成樹脂エ
マルジョンとワックスエマルジョンをライナ表面に塗工
して段ボールに耐水、撥水機能を与える方法が提案され
ている。（特願昭５７−１１８４６９）。このような合
成樹脂エマルジョンとワックスエマルジョン等からなる
撥水層を設けた段ボールは、撥水機能を有すると同時に
に古紙として再離解可能であり、従ってリサイクルが可
能である。[0003] For this reason, various cardboards that have water repellency and water resistance and are used as a raw material for waste paper pulp after use, and can be recycled, have been proposed in recent years as the trend of resource recycling is fostered. For example, a method has been proposed in which a synthetic resin emulsion and a wax emulsion are applied to the surface of a liner to impart water-resistant and water-repellent functions to a cardboard. (Japanese Patent Application No. 57-118469). A corrugated cardboard provided with such a water-repellent layer made of a synthetic resin emulsion, a wax emulsion or the like has a water-repellent function and can be re-disintegrated as used paper, and therefore can be recycled.
【０００４】ところで、段ボールから段ボール箱を製造
するためには、製凾工程のグルアーで糊を塗工し、段ボ
ール同士を接着しなければならない。通常、段ボール箱
の製凾は、毎分１００〜２００ケースの速度でなされて
おり、糊を塗布してから固着するまでの時間は１０〜１
５秒以内という短時間で行われている。しかし、現在段
ボール製凾用の糊として使用されているのは、主として
固形分量や粘度等を適宜調節してなる酢酸ビニルエマル
ジョン等の水系の糊である。従って、段ボールの被接着
面であるライナ表面に撥水性を持たせることは、上記し
たような水系の糊が被着しにくくなることでもある。従
って、段ボールのライナ表面の撥水性を向上させること
は、同時に製凾時の糊付け適性を悪化させることでもあ
り、この点が大きな問題となっていた。このような問題
を解決する方法としては、糊塗工面に当たる部分の塗工
層の表面を金属ブラシ等で摩擦して粗面化したり、ミシ
ン目を入れたり、あるいは、溶剤によって塗工層を剥い
だりする方法が試みられてきた。しかし、これらの方法
では従来技術よりも工程が増えてしまうため、生産効率
上の問題が生じていた。By the way, in order to manufacture a cardboard box from cardboard, glue must be applied by a gluer in a box making process and the cardboards must be bonded to each other. Normally, the production of a cardboard box is performed at a speed of 100 to 200 cases per minute, and the time from application of glue to fixation is 10 to 1 time.
It is performed in a short time of less than 5 seconds. However, an aqueous paste such as a vinyl acetate emulsion whose solid content and viscosity are appropriately adjusted is mainly used as the paste for cardboard boxes. Therefore, making the surface of the liner, which is the surface to be adhered of the cardboard, water-repellent also means that the above-mentioned water-based glue becomes difficult to adhere. Therefore, improving the water repellency of the corrugated cardboard liner surface also impairs the suitability for gluing at the time of manufacture, which has been a major problem. As a method for solving such a problem, the surface of the coating layer corresponding to the glue coating surface is rubbed with a metal brush or the like to be roughened, perforated, or the coating layer is peeled off with a solvent. Ways have been tried. However, in these methods, the number of steps is increased as compared with the related art, and thus a problem in production efficiency has occurred.
【０００５】[0005]
【発明が解決しようとする課題】本発明の課題は、表面
に撥水性を有し、糊付け適性に優れて段ボール箱の素材
として好適であり、しかも使用後リサイクル利用するこ
とが可能な撥水段ボールを提供することである。SUMMARY OF THE INVENTION An object of the present invention is to provide a water-repellent cardboard which has a water-repellent surface, is excellent in gluing properties, is suitable as a material for a cardboard box, and can be recycled after use. It is to provide.
【０００６】[0006]
【課題を解決するための手段】即ち、本発明は波形中芯
とライナとを貼合した段ボールであって、少なくとも一
方のライナのオモテ面に発泡剤を含有する合成樹脂エマ
ルジョンを塗工、発泡させることによって形成された粗
面化撥水層を設けたことを特徴とする撥水段ボールであ
る。That is, the present invention relates to a corrugated cardboard in which a corrugated core and a liner are bonded, wherein at least one of the liners is coated with a synthetic resin emulsion containing a foaming agent on the front side, and foamed. A water-repellent corrugated cardboard comprising a roughened water-repellent layer formed by the formation of a water-repellent layer.
【０００７】[0007]
【発明の実施の形態】本発明は、前述の問題を改善すべ
く検討した結果、合成樹脂エマルジョンに発泡剤を添加
したものを撥水剤とし、ライナ表面に塗工して加熱乾燥
すると同時に発泡させて塗膜表面の形状をミクロ的に粗
面化し、水系糊を被着し易くすることにより、製凾時の
糊付け適性を向上させたものである。また、発泡剤と称
される物質にもいろいろな種類のものがあるが、本発明
において好適に使用される発泡剤は有機系熱分解性化合
物である。有機系熱分解性化合物としてはアゾ化合物、
ヒドラジン誘導体、アジ化合物、トリアゾール化合物、
ニトロソ化合物、セミカルバジド化合物などが挙げられ
る。さらに本発明で使用する前記発泡剤は、１２０℃程
度の比較的低温で分解するものが好適である。また安全
性、安定性などの面も考慮すると、アゾジカルボンアマ
イド（ＡＤＣＡ）、ニトロソペンタメチレンテトラミン
（ＤＰＴ）、ｐ、ｐ'-オキシビスベンゼンスルホニルア
マイド（ＯＢＳＨ）などが好適に用いられる。これらの
発泡剤と共にがアミンなどの分解促進剤を使用すること
によって、発泡剤の分解、発泡温度を下げることができ
る。発泡剤の使用量は、固形分比で撥水剤の５〜５０％
が適当である。また本発明で使用する発泡剤は、粒子径
が１〜２０μｍ、更に好適には５〜８μｍの範囲である
ことが好ましい。１μｍより小さと、塗工層の粗面化が
十分でなく、従って糊付け適性の向上効果が得られな
い。また２０μｍより大きいと、塗工面が過剰に粗面化
するので撥水、耐水性が損なわれる。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention has been studied to improve the above-mentioned problem. As a result, a synthetic resin emulsion obtained by adding a foaming agent is used as a water-repellent agent. In this way, the surface of the coating film is micro-roughened to make it easier to apply the water-based glue, thereby improving the suitability for gluing during the production. Further, there are various kinds of substances referred to as a foaming agent, and the foaming agent suitably used in the present invention is an organic thermal decomposition compound. Azo compounds, as organic thermal decomposable compounds,
Hydrazine derivatives, azide compounds, triazole compounds,
Nitroso compounds, semicarbazide compounds and the like can be mentioned. Further, the foaming agent used in the present invention preferably decomposes at a relatively low temperature of about 120 ° C. In consideration of safety and stability, azodicarbonamide (ADCA), nitrosopentamethylenetetramine (DPT), p, p'-oxybisbenzenesulfonylamide (OBSH) and the like are preferably used. By using a decomposition accelerator such as an amine together with these foaming agents, the decomposition and foaming temperature of the foaming agent can be reduced. The amount of the foaming agent used is 5 to 50% of the water repellent in solid content ratio.
Is appropriate. Further, the particle diameter of the foaming agent used in the present invention is preferably in the range of 1 to 20 μm, more preferably 5 to 8 μm. When it is smaller than 1 μm, the surface of the coating layer is not sufficiently roughened, and hence the effect of improving the suitability for pasting cannot be obtained. On the other hand, if it is larger than 20 μm, the coated surface is excessively roughened, so that water repellency and water resistance are impaired.
【０００８】本発明で使用する合成樹脂エマルジョン
は、アクリル酸エステル共重合体、スチレン−アクリル
酸エステル共重合体、スチレン−アクリル酸樹脂共重合
体、スチレン−ブタジエン樹脂共重合体、エチレン−酢
酸ビニル樹脂共重合体等が挙げられる。これらは単独、
もしくは任意に組合せて使用することができる。本発明
においては、これらの合成樹脂エマルジョンに前記発泡
剤を加え、撥水性塗料とする。また前記撥水性塗料に、
必要に応じて填料を添加することができる。この填料は
カオリン、炭酸カルシウム、水酸化アルミニウムなど、
製紙用に一般的に使用されるもの等が目的に応じて適宜
使用可能である。[0008] The synthetic resin emulsion used in the present invention includes an acrylate ester copolymer, a styrene-acrylate ester copolymer, a styrene-acrylate resin copolymer, a styrene-butadiene resin copolymer, and ethylene-vinyl acetate. Resin copolymers and the like can be mentioned. These alone,
Alternatively, they can be used in any combination. In the present invention, the foaming agent is added to these synthetic resin emulsions to obtain a water-repellent paint. In addition, in the water-repellent paint,
Fillers can be added as needed. This filler contains kaolin, calcium carbonate, aluminum hydroxide, etc.
Those generally used for papermaking can be appropriately used according to the purpose.
【０００９】撥水性塗料のライナへの塗工は、バーコー
ター、エアナイフコーター、ブレードコーター、グラビ
アコーター等、従来用いられている塗工機が必要に応じ
て任意に使用できる。なお、ライナのオモテ面というの
は、段ボールシートにするときにシート表面となる側、
即ち中芯との貼合面の反対側となるライナ面のことを指
す。また、前記撥水性塗料の塗工量は固形分で１〜３０
ｇ／ｍ2が適当である。前記塗料が塗工される原紙は、
一般に用いられるライナ原紙、又は耐水ライナ原紙等が
必要に応じて任意に使用できる。またこれにライナや中
芯紙、板紙、一般紙を貼り合わせて使用することも可能
である。更に、前記のライナ原紙等にワックスエマルジ
ョン等のリサイクル性に悪影響を及ぼさない撥水剤を塗
工することにより表面に撥水性を付与しておくこともで
きる。その場合、製凾時に段ボールシートの糊塗工する
部分にのみ、本発明の撥水性塗料を塗工しておくことも
できる。撥水性塗料を塗工後のライナを、まずシングル
フェーサーで中芯原紙と貼合し、次いでダブルフェーサ
ーで貼合して段ボールシートを作成する。このシートを
フレキソフォルダグルア（ＦＦＧ）で印刷と打ち抜き、
及びグルー糊付けが行われて段ボールケースとする。な
お、本発明において段ボール箱を作成するにあたり、粗
面化撥水層は箱の外側となるようにすることが望まし
い。The water-repellent paint can be applied to the liner by using a conventionally used coating machine such as a bar coater, an air knife coater, a blade coater, a gravure coater, etc., if necessary. In addition, the front side of the liner is the side that becomes the sheet surface when making it into a cardboard sheet,
That is, it refers to the liner surface opposite to the bonding surface with the core. The coating amount of the water-repellent paint is 1 to 30 in solid content.
g / m 2 is appropriate. The base paper on which the paint is applied,
A commonly used liner base paper or a water-resistant liner base paper can be arbitrarily used as needed. In addition, a liner, a core paper, a paperboard, and a general paper can be bonded to this and used. Furthermore, the surface of the liner base paper or the like may be provided with water repellency by applying a water repellent that does not adversely affect the recyclability of the wax emulsion or the like. In that case, the water-repellent paint of the present invention can be applied only to the portion of the cardboard sheet to be coated with glue during the production. The liner after the application of the water-repellent paint is first bonded to the core base paper with a single facer, and then bonded with a double facer to make a corrugated cardboard sheet. Printing and punching this sheet with flexo folder gluer (FFG)
Then, glue is applied to form a cardboard case. In preparing the cardboard box in the present invention, it is desirable that the roughened water-repellent layer be outside the box.
【００１０】本発明を実施するためには、撥水性塗料を
塗工、乾燥する際に、塗料中の発泡剤を発泡させる必要
がある。前述の本発明に好適な１２０℃程度で発泡する
発泡剤を使用した場合、１３０℃以上、且つ６０秒以上
条件下で乾燥を行えば、撥水層の発泡はほぼ完了する。
本発明では、ライナ原紙のオモテ面に発泡剤を含む撥水
性塗料を塗工し、上記条件で乾燥して粗面化撥水層を形
成し、さらにこのライナを使用して段ボールシートを製
造する。段ボールシートの貼合時、ロール温度が１６０
〜１８０℃のプレヒーターロールに前記撥水性塗料の塗
工面が直接接触する。この部分の保持時間は通常１０秒
以内であるが、これら２段階の加熱によって未発泡であ
った発泡剤も発泡し、段ボール表面に粗面化撥水層が得
られる。In order to carry out the present invention, it is necessary to foam a foaming agent in the paint when applying and drying the water-repellent paint. When the above-mentioned foaming agent suitable for the present invention, which foams at about 120 ° C., is used, foaming of the water-repellent layer is almost completed by drying at 130 ° C. or more for 60 seconds or more.
In the present invention, a water-repellent paint containing a foaming agent is applied to the front side of the liner base paper, dried under the above conditions to form a roughened water-repellent layer, and a cardboard sheet is manufactured using the liner. . When laminating the corrugated cardboard sheet, the roll temperature is 160
The coated surface of the water-repellent paint comes in direct contact with the preheater roll at ~ 180 ° C. The holding time of this portion is usually within 10 seconds, but the foaming agent which has not been foamed by these two stages of heating also foams, and a roughened water-repellent layer is obtained on the corrugated cardboard surface.
【００１１】[0011]
【実施例】以下の実施例、比較例によって本発明を具体
的に説明する。 ＜実施例＞ライナ原紙（王子ＳＲＫ２８０、王子製紙
（株））のオモテ面に、撥水性塗料としてデラミカオリ
ン（Ｎu−ｃｌａｙ）５０部、アクリル酸エステル共重
合体エマルジョン（ジョンクリル７３４、ジョンソンポ
リマー（株））２５部、スチレンブタジエン共重合体エ
マルジョン（ニポールLX−４０７K３、日本ゼオン
（株））、発泡剤（ネオセルボンN#５０００、永和化成
（株））１０部を混合、分散した４０％スラリーを１５
ｇ／ｍ2塗工した後、１４０℃に設定した乾燥機に１分
通し、粗面化撥水層をオモテ面に有するライナを得た。
前記ライナをシングルフェーサーにより中芯（北陽製紙
強化中芯ＨＰ２００）と貼合、ダブルフェーサーで（ラ
イナ王子ＳＫ２８０）と貼合し、段ボールシートを作成
した。更に前記シートを、粗面化撥水層が箱の外側にな
るようにし、ＦＦＧ機により、撥水撥水用グルー糊（ボ
ンドＳＰ２８１、コニシ（株））を用いて貼り合わせて
段ボールケースを作成した。段ボールケースの接着部分
は正常に接着していた。The present invention will be specifically described with reference to the following examples and comparative examples. <Examples> 50 parts of delamicaolin (Nu-lay) as a water-repellent coating, acrylic ester copolymer emulsion (Johncryl 734, Johnson polymer (A) on the front side of liner base paper (Oji SRK280, Oji Paper Co., Ltd.) Co., Ltd.), 25 parts of a styrene-butadiene copolymer emulsion (Nipol LX-407K3, Nippon Zeon Co., Ltd.), and 10 parts of a foaming agent (Neocervone N # 5000, Eiwa Chemical Co., Ltd.). Fifteen
g / m 2 was applied, and then passed through a dryer set at 140 ° C. for 1 minute to obtain a liner having a roughened water-repellent layer on the front surface.
The liner was bonded to a core (Hokuyo Paper Reinforced Core HP200) with a single facer, and bonded to a liner (Ojina Liner SK280) with a double facer to produce a cardboard sheet. Furthermore, the above-mentioned sheet is bonded so that the roughened water-repellent layer is on the outside of the box, and glued with a water-repellent and water-repellent glue (Bond SP281, Konishi Co., Ltd.) using an FFG machine to form a cardboard case. did. The bonded portion of the cardboard case was normally bonded.
【００１２】＜比較例＞発泡剤を添加しない以外は実施
例１と同様にして撥水性塗料を作成し、塗工、貼合、Ｆ
ＦＧ機の操作を行い、段ボールケースを作成した。得ら
れた段ボールケースの接着部分は接着されていなかっ
た。なお、実施例、及び比較例の撥水層の物性を評価し
たものを表１として示す。<Comparative Example> A water-repellent paint was prepared in the same manner as in Example 1 except that no foaming agent was added.
The FG machine was operated to create a cardboard case. The bonded portion of the obtained cardboard case was not bonded. Table 1 shows the results of evaluation of the physical properties of the water-repellent layers of Examples and Comparative Examples.
【００１３】[0013]
【表１】 [Table 1]
【００１４】[0014]
【発明の効果】本発明により、表面に撥水性を有し、糊
付け適性に優れて段ボール箱の素材として好適であり、
しかも使用後リサイクル利用することが可能な撥水段ボ
ールを提供することができる。According to the present invention, the material has water repellency on its surface, has excellent gluing properties, and is suitable as a material for cardboard boxes.
Moreover, a water-repellent cardboard that can be recycled after use can be provided.
フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｂ６５Ｄ 5/62 Ｂ６５Ｄ 5/62 Ｂ Ｃ０９Ｋ 3/18 １０１ Ｃ０９Ｋ 3/18 １０１ Ｆターム(参考） 3E060 BC02 BC04 BC08 DA21 DA30 EA06 EA12 EA13 3E078 AA20 BB03 BB24 BB35 BB39 BB45 BC01 4F100 AK01B AK01C AK25B AK25C AK25J AK73B AK73C AL01B AL01C BA02 BA03 BA06 BA10A BA10B BA10C BA13 CA01B CA01C CC00B CC00C DD12A DJ01B DJ01C GB15 GB16 GB23 JB06B JB06C JL16 JM01B JM01C 4H020 BA13 Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat II (reference) B65D 5/62 B65D 5/62 B C09K 3/18 101 C09K 3/18 101 F term (reference) 3E060 BC02 BC04 BC08 DA21 DA30 EA06 EA12 EA13 3E078 AA20 BB03 BB24 BB35 BB39 BB45 BC01 4F100 AK01B AK01C AK25B AK25C AK25J AK73B AK73C AL01B AL01C BA02 BA03 BA06 BA10A BA10B BA10C BA13 CA01B01 J01 GB01B01 J01 GB01B01
Claims (1)
であって、少なくとも一方のライナのオモテ面に発泡剤
を含有する合成樹脂エマルジョンを塗工、発泡させるこ
とによって形成された粗面化撥水層を設けたことを特徴
とする撥水段ボール。1. A corrugated cardboard in which a corrugated core and a liner are bonded to each other, wherein at least one of the liners is coated with a synthetic resin emulsion containing a foaming agent and foamed on the front surface. A water-repellent cardboard provided with a water-repellent layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11095899A JP2000280378A (en) | 1999-04-02 | 1999-04-02 | Water repellent corrugated fiberboard |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11095899A JP2000280378A (en) | 1999-04-02 | 1999-04-02 | Water repellent corrugated fiberboard |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000280378A true JP2000280378A (en) | 2000-10-10 |
Family
ID=14150158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11095899A Pending JP2000280378A (en) | 1999-04-02 | 1999-04-02 | Water repellent corrugated fiberboard |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000280378A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008266525A (en) * | 2007-04-24 | 2008-11-06 | Nitto Denko Corp | Filling foam composition, foam filling member and filling foam |
-
1999
- 1999-04-02 JP JP11095899A patent/JP2000280378A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008266525A (en) * | 2007-04-24 | 2008-11-06 | Nitto Denko Corp | Filling foam composition, foam filling member and filling foam |
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