JP5133587B2 - Paper or paperboard for packaging containers with cushion function - Google Patents
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Description
本発明は、優れたクッション性を有し、被包装物の型入り・傷入りを防止することができるクッション機能を備える紙又は板紙に関する。 The present invention relates to a paper or paperboard having an excellent cushioning property and having a cushioning function capable of preventing a packaged article from entering into a mold or being damaged.
従来より、例えば、住宅等に使用される内装ドア、室内ドア等の建具、収納、階段や階段部材、床材、フローリング等の住宅向け建材等や、エアコン、テレビ、DVDレコーダー等のプラスチック材料が用いられる物品等(以下、「被包装物」という。)を輸送したり、保管する際に、段ボールケース等の包装容器に梱包されることが多い。 Conventionally, for example, interior doors used for houses, interior fittings such as indoor doors, housing, building materials for housing such as stairs and stairs members, flooring, flooring, etc., and plastic materials such as air conditioners, TVs, DVD recorders, etc. When goods used (hereinafter referred to as “packages”) are transported or stored, they are often packed in a packaging container such as a cardboard case.
しかしながら、被包装物が直接段ボールケースに梱包されると、被包装物の商品価値を低下させてしまう可能性がある。すなわち、被包装物を不織布等の保護材料で包装せずに、段ボールケースに直接梱包すると、段ボールケース(段ボールシート)の段目が被包装物に型として入ってしまったり、被包装物の表面に細かな傷が入ってしまい、被包装物の商品価値が低下することがあった。 However, if a packaged item is directly packed in a corrugated cardboard case, the commercial value of the packaged item may be reduced. In other words, if the package is packed directly in a cardboard case without being wrapped with a protective material such as non-woven fabric, the corrugated cardboard case (corrugated cardboard sheet) will enter the package as a mold, or the surface of the package In some cases, the product value of the packaged goods may be reduced.
従って、被包装物に段ボールケースの段目が型として入ることを防止したり、被包装物の表面に細かな傷が入ることを防止するため、不織布等の保護材料で被包装物を包装した上で段ボールケースに梱包したり、段ボールケースに気泡クッション材等のクッション材料を入れたりすることが行われている。 Therefore, in order to prevent the cardboard case from entering the package as a mold or to prevent the surface of the package from being finely scratched, the package is packaged with a protective material such as a nonwoven fabric. It is performed to pack in a cardboard case or to put a cushion material such as a bubble cushion material in the cardboard case.
しかしながら、このように保護材料やクッション材料を入れると包装にかかるコストが高くなるばかりでなく、包装の手間もかかるという問題があった。 However, when the protective material and the cushion material are added in this way, there is a problem that not only the cost for packaging is increased, but also the labor for packaging is required.
そこで、例えば特許文献1に記載されるような包装用部材が提案されている。すなわち、矩形状を呈する2枚の樹脂フィルムを重ね合わせ、逆止弁構造を有するエアー吹き込み部材を介在させて外周縁部を熱シールすると共に、複数の区画用熱シール部を形成して複数の隣接した空気室を形成した包装用部材であって、樹脂フィルムの一方に紙シート材を一体的に貼着させ、紙シート材を貼着させた面を外側にし各空気室が被包装物の周囲に当接するようにして全体を包装し、包装した状態で包装用部材の自由端部を粘着テープで貼着固定してクッション機能を有する包装容器を兼用させる構成にした包装用部材が提案されている。 Thus, for example, a packaging member as described in Patent Document 1 has been proposed. That is, two rectangular resin films are overlapped, an air blowing member having a check valve structure is interposed, and the outer peripheral edge portion is heat sealed, and a plurality of partition heat seal portions are formed. A packaging member in which adjacent air chambers are formed, in which a paper sheet material is integrally attached to one side of a resin film, and a surface on which the paper sheet material is attached is outside and each air chamber is an object to be packaged. A packaging member has been proposed which is configured to be used as a packaging container having a cushion function by packaging the whole so as to contact the surroundings, and sticking and fixing the free end of the packaging member with an adhesive tape in the packaged state. ing.
このような包装用部材は、包装にかかる手間がかかるという問題を解決することはできるものの、包装材料と、保護材料やクッション材料との2つの部材が必要であったため、保護材料やクッション材料の分だけコストが高くなるという問題は解決されなかった。 Although such a packaging member can solve the problem of taking time and effort for packaging, since two members of the packaging material, the protective material and the cushion material are necessary, the protective material and the cushion material The problem of higher costs was not solved.
本発明は上述したような実情に鑑みてなされたもので、その目的とするところは、不織布や気泡クッション材のような被包装物の型入り・傷入りを防止するための保護材料やクッション材料を使用せずとも、クッション性に優れ、被包装物の傷入り・型入りを防止できるクッション機能を備えた紙又は板紙、及びこの紙又は板紙を用いて形成された包装容器及びクッション材を提供することにある。 The present invention has been made in view of the above-described circumstances, and its object is to provide a protective material and a cushion material for preventing a packaged article, such as a nonwoven fabric or a bubble cushion material, from entering a mold or being damaged. A paper or paperboard that has a cushioning function that is excellent in cushioning properties and can prevent a packaged object from being scratched or molded, and a packaging container and a cushion material formed using the paper or paperboard. There is to do.
本発明の上記目的は、基紙と、該基紙の少なくとも片面に少なくとも熱発泡性粒子及びガラス転移温度が30〜70℃であるバインダを含有した塗工液を塗布して設けた塗工層とを少なくとも具備し、前記熱発泡性粒子は、前記塗工層中に固形分換算で5〜20質量%含有されており、前記塗工層は、前記熱発泡性粒子及びバインダを、乾燥させることにより前記熱発泡性粒子を発泡させてクッション層としたことを特徴とするクッション機能を備える包装容器用途の紙又は板紙を提供することによって達成される。
The above object of the present invention is to provide a base paper and a coating layer provided by applying a coating liquid containing at least a thermally foamable particle and a binder having a glass transition temperature of 30 to 70 ° C. on at least one side of the base paper. at least comprising the door, the heat expandable particles, said the coating layer are contained 5-20 wt% in terms of solid content, the coating layer, the thermal expandable particles and a binder, and dried This is achieved by providing a paper or paperboard for packaging containers having a cushion function, wherein the thermally foamable particles are foamed to form a cushion layer.
また、本発明の上記目的は、前記熱発泡粒子及び前記バインダは、固形分比率で7〜50:93〜50の割合で含有し、前記塗工液の塗工量は片面当たり固形分換算で16〜120g/m 2 であり、乾燥温度100〜120℃である乾燥工程にて、前記塗工層をクッション層とし、且つ前記塗工層を含む坪量が180〜500g/m 2 の範囲内であることを特徴とするクッション機能を備える包装容器用途の紙又は板紙を提供することによって、効果的に達成される。
Moreover, the said objective of this invention contains the said thermally foamed particle and the said binder in the ratio of 7-50: 93-50 by solid content ratio, and the coating amount of the said coating liquid is solid content conversion per single side | surface. In the drying step of 16 to 120 g / m 2 and a drying temperature of 100 to 120 ° C., the coating layer is used as a cushion layer, and the basis weight including the coating layer is in the range of 180 to 500 g / m 2 . It is effectively achieved by providing a paper or paperboard for a packaging container having a cushion function characterized by being.
また、本発明の上記目的は、前記紙又は板紙のクッション性は、前記クッション性の評価の指標として反発係数を用い、前記反発係数が0.40〜0.50となることを特徴とするクッション機能を備える包装容器用途の紙又は板紙を提供することによって、より効果的に達成される。
The above-described object of the present invention, cushioning of the paper or paperboard, the coefficient of restitution used as an index of evaluation of the cushioning, wherein the coefficient of restitution, characterized in that a 0.40 to 0.50 cushion It is more effectively achieved by providing a paper or paperboard for packaging containers with functionality.
さらにまた、本発明の上記目的は、上記いずれかに記載のクッション機能を備える包装容器用途の紙又は板紙を包装容器又はクッション材に用いることによって、より効果的に達成される。 Furthermore, the above object of the present invention, the by using the packaging container or cushion material of paper or paperboard of packaging applications comprising a cushioning function of any one, is more effectively achieved.
本発明に係るクッション機能を備える紙又は板紙によれば、基紙と、該基紙の少なくとも片面に少なくとも熱発泡性粒子及びバインダを含有した塗工液を塗布して設けた塗工層とを少なくとも具備し、塗工層を乾燥させることにより熱発泡性粒子を発泡させてクッション層としたので、優れたクッション性を有し、被包装物の傷入り・型入りを防止することができる。従って、被包装物の傷入り・型入りを防止するための保護材料やクッション材料を用いる必要がなくなり、また工程の簡略化、コストの低減を図ることができる。 According to the paper or paperboard having a cushion function according to the present invention, a base paper and a coating layer provided by applying a coating liquid containing at least a thermally foamable particle and a binder to at least one surface of the base paper. At least, the thermally foamable particles are foamed by drying the coating layer to form a cushion layer. Therefore, the cushioning layer has excellent cushioning properties and can prevent the packaged object from being scratched or molded. Therefore, it is not necessary to use a protective material or a cushion material for preventing the packaged item from being damaged or mold-molded, and the process can be simplified and the cost can be reduced.
また、熱発泡性粒子を塗工層中に固形分換算で5〜20質量%含有したので、クッション性を得ることができるとともに、基紙と塗工層との接着性も良好であり、熱発泡性粒子の離脱もなくなる。 Further, since the thermal expandable particles containing 5 to 20 wt% in terms of solid content in the coating layer, it is possible to obtain a cushioning property, and also good adhesion between the base paper and the coating layer, heat There is no separation of the expandable particles.
さらにまた、塗工液の塗工量を片面当たり固形分換算で16〜120g/m2としたので、クッション性、傷入り防止性、型入り防止性をより良好なものとすることができる。 Furthermore, since the coating amount of the coating liquid is set to 16 to 120 g / m 2 in terms of solid content per side, the cushioning property, the scratch preventing property and the mold preventing property can be further improved.
以下、本発明に係るクッション機能を備える紙又は板紙について、詳細に説明する。なお、本発明に係る紙又は板紙は、以下の実施形態に限定されるものではなく、特許請求の範囲を逸脱しない範囲内において、その構成を適宜変更できることはいうまでもない。 Hereinafter, the paper or paperboard provided with the cushion function according to the present invention will be described in detail. Incidentally, paper or paperboard according to the present invention is not limited to the following embodiments in a range not departing from the scope of the appended claims, can of course be appropriately changed its configuration.
本発明に係るクッション機能を備える紙又は板紙(以下、「本紙又は板紙」という)は、基紙の少なくとも片面に、少なくとも熱発泡性粒子及びバインダを含有する塗工液を塗布して塗工層を形成し、その後、塗工層を乾燥させて熱発泡性粒子を発泡させてクッション層とすることにより構成される。 Paper or paperboard having a cushion function according to the present invention (hereinafter referred to as “main paper or paperboard”) is applied by applying a coating liquid containing at least thermally foamable particles and a binder to at least one surface of a base paper. After that, the coating layer is dried to foam the thermally foamable particles to form a cushion layer.
これにより、本紙又は板紙は優れたクッション性を有するようになる。すなわち、本紙又は板紙は段ボールケース等の包装容器、クッション材等に加工することを1つの目的としている。従って、本紙又は板紙を用いて形成された包装容器やクッション材等は、優れたクッション性を有するので、保護材料やクッション材料を用いることなく、被包装物の表面に傷が入ることを防止し(以下、「傷入り防止」という)、また段ボールシート等の段が型として被包装物の表面に入ることを防止(以下、「型入り防止」という)することができる。 Thereby, this paper or paperboard comes to have an excellent cushioning property. In other words, the main purpose of this paper or paperboard is to process it into a packaging container such as a cardboard case, a cushioning material or the like. Therefore, since packaging containers and cushion materials formed using genuine paper or paperboard have excellent cushioning properties, it is possible to prevent the surface of the package from being damaged without using protective materials or cushion materials. (Hereinafter referred to as “prevention of scratches”), and a step such as a corrugated cardboard sheet can be prevented from entering the surface of the packaged object as a mold (hereinafter referred to as “prevention of mold”).
なお、本願明細書に記載する「クッション機能を備える紙又は板紙」とは、一般的な印刷用紙や段ボール原紙、板紙等にはないクッション機能、すなわち、二つの物の間(被包装物と被包装物との間)に起こる衝突や衝撃、あるいは本紙又は板紙と被包装物との間に起こる衝突や衝撃をやわらげる機能を有する紙又は板紙をいう。 The “paper or paperboard having a cushion function” described in the present specification means a cushion function that is not found in general printing paper, cardboard base paper, paperboard, etc. This refers to paper or paperboard that has a function to soften the collision or impact that occurs between the package and the paper or the paperboard and the packaged product.
本紙又は板紙に用いられる基紙は特に限定されるものではなく、例えば、上質紙、アート紙、コート紙、片艶紙、含浸紙、板紙等の種々のものの中から、使用用途に応じて適宜選択して使用することができる。 The base paper used for the main paper or the paperboard is not particularly limited. For example, the base paper can be appropriately selected from various materials such as fine paper, art paper, coated paper, glossy paper, impregnated paper, and paperboard depending on the intended use. You can select and use.
しかしながら、本紙又は板紙が、例えば被包装物の輸送、保管、保護のために用いられる段ボールケース等の包装容器に加工され、梱包材として用いられる場合や、クッション材に加工される場合には、段ボール原紙、厚紙等の板紙を基紙として用いることが好ましい。 However, when this paper or paperboard is processed into a packaging container such as a cardboard case used for transporting, storing and protecting the packaged goods, and used as a packaging material, or when processed into a cushioning material, It is preferable to use paperboard such as corrugated cardboard or cardboard as the base paper.
また、本紙又は板紙は、基紙の少なくとも片面に塗工液を塗布して塗工層(クッション層)が設けられる。このため、塗工液が塗布される基紙の面のベック平滑度が45秒以下、好ましくは30秒以下、より好ましくは20秒以下であることが好ましい。すなわち、基紙のベック平滑度が45秒を超えると、塗工層と基紙との接着性が低下する傾向にある。このため、塗工層を乾燥させる際の加熱により、塗工層中に含まれる熱発泡性粒子を発泡させてクッション層にした場合、クッション層が基紙から浮き上がって剥れてしまうという問題が生じやすい。 Further, the main paper or paperboard is provided with a coating layer (cushion layer) by applying a coating liquid on at least one side of the base paper. For this reason, it is preferable that the Beck smoothness of the surface of the base paper to which the coating liquid is applied is 45 seconds or less, preferably 30 seconds or less, more preferably 20 seconds or less. That is, when the Beck smoothness of the base paper exceeds 45 seconds, the adhesiveness between the coating layer and the base paper tends to decrease. For this reason, when the heat-foamable particles contained in the coating layer are foamed into a cushion layer by heating when the coating layer is dried, there is a problem that the cushion layer is lifted off from the base paper and peeled off. Prone to occur.
上述したように、基紙の少なくとも片面に塗布される塗工液は、少なくとも熱発泡性粒子とバインダとが含有されている。すなわち、塗工液に熱発泡性粒子を含有すると、塗工層を乾燥・加熱することにより、熱発泡性粒子を膨張・発泡させて、塗工層をクッション層とし、本願の所望とするクッション性を得ることができる。また、バインダを含有することにより、本紙又は板紙の表面強度を向上させることができる。従って、本紙又は板紙が段ボールケース等の包装容器、クッション材等に加工されて被包装物の輸送、保管等に用いられた場合、輸送時、保管時等における擦れによる紙剥け、破れ等の発生を防止することができる。これにより、本紙又は板紙は、クッション性、傷入り防止性、及び型入り防止性に優れるものとなるので、被包装物への傷入りや型入りを防止することができる。 As described above, the coating liquid applied to at least one side of the base paper contains at least thermally foamable particles and a binder. That is, if the coating solution contains thermally foamable particles, the coating layer is dried and heated to expand and foam the thermally foamable particles, and the coating layer is used as a cushion layer. Sex can be obtained. Moreover, the surface intensity | strength of this paper or paperboard can be improved by containing a binder. Therefore, when this paper or paperboard is processed into a packaging container such as a cardboard case, cushioning material, etc. and used for transporting or storing the packaged items, the paper may be peeled or torn due to rubbing during transportation or storage. Can be prevented. Thereby, since this paper or paperboard becomes excellent in cushioning property, damage prevention property, and mold prevention property, it is possible to prevent damage to the packaged item and entering the die.
以下に、本紙又は板紙に用いられる塗工液に含有される熱発泡性粒子及びバインダについて詳述する。 Below, the heat-expandable particle | grains and binder which are contained in the coating liquid used for this paper or paperboard are explained in full detail.
熱発泡性粒子は塗工層中に固形分換算で5〜20質量%、好ましくは7〜17質量%含有される。熱発泡性粒子の含有率が5質量%未満であると、熱発泡性粒子が発泡した状態であっても、熱発泡性粒子の存在密度が低いため、本紙又は板紙が所望とするクッション性を得ることが難しくなる。一方、熱発泡性粒子の含有率が20質量%を超えると、クッション性には優れるものの、基紙と塗工層との接着性が低下する。また、熱発泡性粒子の離脱が生じやすくなり、離脱した熱発泡性粒子が被包装物へ付着する等の問題も生じやすくなる。 The thermally foamable particles are contained in the coating layer in an amount of 5 to 20% by mass, preferably 7 to 17% by mass in terms of solid content. When the content of the heat-expandable particles is less than 5% by mass, even if the heat-expandable particles are in a foamed state, the density of the heat-expandable particles is low. It becomes difficult to obtain. On the other hand, when the content of the thermally foamable particles exceeds 20% by mass, the cushioning property is excellent, but the adhesiveness between the base paper and the coating layer is lowered. Further, the heat-expandable particles are likely to be detached, and problems such as adhesion of the detached heat-expandable particles to the package are likely to occur.
なお、本紙又は板紙に含有される熱発泡性粒子の含有率を増加させたい場合には、塗工層1層当たりの熱発泡性粒子の含有率は5〜20質量%のままで、塗工層を2層以上設けることが好ましい。これにより本紙又は板紙のクッション性を得やすくなる。 Incidentally, when it is desired to increase the content of the thermal expandable particles contained in the newspaper or paperboard, the content of the thermal expandable particles per coated layer one layer remains 5-20 wt%, the coating It is preferable to provide two or more layers. This makes it easier to obtain cushioning properties of the main paper or paperboard.
この熱発泡性粒子としては、熱可塑性合成樹脂で構成された微細粒子外殻内に低沸点溶剤を封入したものを用いることができる。この熱発泡性粒子は、平均粒径が5〜30μmで、90〜200℃での加熱により直径が4〜5倍、体積が50〜130倍に膨張する。 As the thermally foamable particles, particles obtained by encapsulating a low boiling point solvent in a fine particle outer shell made of a thermoplastic synthetic resin can be used. These heat-expandable particles have an average particle size of 5 to 30 μm, and expand at a diameter of 4 to 5 times and a volume of 50 to 130 times when heated at 90 to 200 ° C.
外殻を構成する熱可塑性合成樹脂としては、例えば、塩化ビニリデン、アクリロニトリル、アクリル酸エステル、メタクリル酸エステル等の共重合体等を挙げることができる。また、外殻内に封入される低沸点溶剤としては、例えば、イソブタン、ペンタン、石油エーテル、ヘキサン、低沸点ハロゲン化炭化水素、メチルシラン等を挙げることができる。 Examples of the thermoplastic synthetic resin constituting the outer shell include copolymers such as vinylidene chloride, acrylonitrile, acrylic acid ester, and methacrylic acid ester. As the low-boiling solvent which is encapsulated within an outer shell, for example, it may be mentioned isobutane, pentane, petroleum ether, hexane, low boiling halogenated hydrocarbons, methylsilane, and the like.
このような熱発泡性粒子としては、例えば、松本油脂製薬株式会社製造の「マツモトマイクロスフェアF−20シリーズ」、「同F−30シリーズ」、「同F−36シリーズ」、「同F−46シリーズ」や、日本フィライト株式会社販売の「エクスパンセルWU」、「エクスパンセルDU」等を使用することができるが、本紙又は板紙に使用される熱発泡性粒子はこれらに限定されるものではない。 Examples of such thermally expandable particles include “Matsumoto Microsphere F-20 Series”, “F-30 Series”, “F-36 Series”, and “F-46” manufactured by Matsumoto Yushi Seiyaku Co., Ltd. Series "and, Japan Fillite Co., Ltd. of sales" Expancel WU "," what is Aix it is possible to use the bread cell DU "and the like, heat expandable particles to be used in the actual paper or paperboard, which is limited to is not.
熱発泡性粒子は、外殻を構成する熱可塑性合成樹脂の軟化点以上に加熱され、同時に封入されている低沸点溶剤が気化し蒸気圧が上昇することにより、外殻が膨張して粒子が膨張する。なお、膨張時は、内圧と殻の張力・外圧が釣り合って膨張状態が保持される。熱発泡性粒子は、一般的にはこの状態まで膨張させ、軽量化剤、嵩高化剤、断熱剤等として利用されている。この膨張状態の熱発泡性粒子にさらに熱が加えられた場合には、膨張して薄くなった殻からガスが透過拡散し、内圧よりも殻の張力・外圧が大きくなってしまい、発泡した粒子が収縮してしまう。 The thermally foamable particles are heated above the softening point of the thermoplastic synthetic resin that constitutes the outer shell, and at the same time, the encapsulated low boiling point solvent evaporates and the vapor pressure rises. Inflate. During expansion, the internal pressure and the shell tension / external pressure are balanced to maintain the expanded state. The thermally foamable particles are generally expanded to this state and used as a lightening agent, a bulking agent, a heat insulating agent or the like. When further heat is applied to the thermally expanded particles in the expanded state, gas permeates and diffuses from the expanded and thin shell, and the shell tension / external pressure becomes larger than the internal pressure, resulting in expanded particles. Will shrink.
本紙又は板紙に使用される熱発泡性粒子は、乾燥工程でドライヤにより発泡させる。従って、一般的に紙乾燥工程の温度は120℃程度であることから、膨張開始温度が90〜130℃の低温膨張タイプの熱発泡性粒子を用いることが好ましい。特に、膨張開始温度が90℃未満の熱発泡性粒子であると、乾燥工程のドライヤにより発泡させた場合、上述したように一旦膨張した粒子が再び収縮してしまうため、所定のクッション性を得ることが難しくなる。 The thermally foamable particles used for the paper or paperboard are foamed by a dryer in the drying process. Therefore, since the temperature of the paper drying step is generally about 120 ° C., it is preferable to use low-temperature expansion type thermally expandable particles having an expansion start temperature of 90 to 130 ° C. In particular, when the expansion start temperature is a heat-expandable particle having a temperature of less than 90 ° C., when expanded by a dryer in the drying process, the expanded particle once again contracts as described above, thereby obtaining a predetermined cushioning property. It becomes difficult.
一方、膨張開始温度が130℃を超えると、乾燥・発泡工程における加熱温度、熱量不足による発泡不良という問題が発生する。また、適切な加熱温度、熱量とするためには、製造スピードを大幅に低下させる必要が生じ、生産効率が低下する結果となる。 On the other hand, when the expansion start temperature exceeds 130 ° C., there arises a problem that the heating temperature in the drying / foaming process and foaming failure due to insufficient heat quantity are generated. In addition, in order to obtain an appropriate heating temperature and amount of heat, it is necessary to significantly reduce the manufacturing speed, resulting in a reduction in production efficiency.
上述したように本紙又は板紙は包装容器、クッション材に加工されることを1つの目的としている。本紙又は板紙を包装容器や、クッション材に加工する際に罫線部(折り曲げ部)には強い折り曲げの力が加わる。従って、本紙又は板紙の塗工層には、このような強い力が加わっても塗工層(クッション層)が割れないこと、塗工層が基紙から浮き上がって剥れないことが要求される。このため、バインダを塗工層中に固形分換算で20〜65質量%含有させることが好ましい。 As described above, one purpose of the main paper or paperboard is to be processed into a packaging container or a cushion material. When the paper or paperboard is processed into a packaging container or cushion material, a strong bending force is applied to the ruled line portion (folded portion). Accordingly, it is required that the coating layer of the main paper or paperboard does not break the coating layer (cushion layer) even when such a strong force is applied, and that the coating layer does not lift up and peel off from the base paper. . For this reason, it is preferable to contain 20-65 mass% of binder in conversion of solid content in a coating layer.
バインダの含有率が20質量%未満であると、熱発泡性粒子との接着性が不十分となり、熱発泡性粒子の離脱が発生しやすく、基紙との接着性も不足する場合がある。一方、バインダの含有率が65質量%を超えると、熱発泡性粒子の接着性はほとんど向上せず、逆に増粘による塗工不良や、熱発泡性粒子の発泡を阻害し発泡不良を招きやすくなる。すなわち、熱発泡性粒子の膨張・発泡が阻害されてしまうと、本紙又は板紙にクッション性を付与することができず、この結果傷入り防止性・型入り防止性も低下してしまう。 When the binder content is less than 20% by mass, the adhesiveness with the thermally foamable particles becomes insufficient, the thermal foamable particles are easily detached, and the adhesiveness with the base paper may be insufficient. On the other hand, if the binder content exceeds 65% by mass, the adhesiveness of the heat-expandable particles is hardly improved, and conversely, the coating failure due to thickening or the foaming of the heat-expandable particles is hindered, resulting in a foam failure. It becomes easy. That is, when the expansion and foaming of the heat expandable particles is hindered, it is impossible to impart cushioning properties to the actual paper or paperboard, decreases also result scratch-containing anti--type containing anti properties.
このようなバインダとしては、スチレン−ブタジエン系ラテックス、アクリル系エマルション、アクリル−スチレン系エマルション、酢酸ビニル系エマルション、ウレタン系エマルション等の水分散系バインダ;デンプン、変性デンプン、ポリビニルアルコール(PVA)等の水溶性バインダ等を、単独であるいは二種以上を組み合わせて使用することができる。 Examples of such binders include water-dispersed binders such as styrene-butadiene latex, acrylic emulsion, acrylic-styrene emulsion, vinyl acetate emulsion, and urethane emulsion; starch, modified starch, polyvinyl alcohol (PVA), and the like. A water-soluble binder etc. can be used individually or in combination of 2 or more types.
しかしながら、本紙又は板紙に用いられる塗工液には、上述したように熱発泡性粒子も含有されるため、バインダの種類、性状によっては、熱発泡性粒子との接着性、基紙との接着性、熱発泡性粒子の発泡抑制、加熱による乾燥・発泡工程での耐熱性等の点で問題を招き、本紙又は板紙の表面強度の低下や、品質トラブル等の問題を招くおそれがある。 However, since the coating liquid used for the paper or paperboard also contains thermally foamable particles as described above, depending on the type and properties of the binder, the adhesiveness to the thermally foamable particles and the adhesion to the base paper May cause problems in terms of heat resistance, foaming suppression of heat-foamable particles, heat resistance in drying / foaming processes due to heating, and may cause problems such as a decrease in surface strength of paper or paperboard and quality troubles.
このため、上述したバインダの中でも、スチレン−ブタジエン系ラテックス、アクリル系エマルション、ウレタン系エマルションを用いることが好ましく、特にアクリル系エマルションを用いることが好適である。すなわち、スチレン−ブタジエン系ラテックス、アクリル系エマルション、ウレタン系エマルションは、熱発泡性粒子との接着性、及びこの塗工液を塗布することにより形成される塗工層と基紙との接着性が良好であり、熱発泡性粒子の膨張・発泡を阻害することがないとともに、被包装物に傷が入ることを防止することができる。 For this reason, it is preferable to use a styrene-butadiene latex, an acrylic emulsion, or a urethane emulsion among the binders described above, and it is particularly preferable to use an acrylic emulsion. That is, styrene-butadiene latex, acrylic emulsion, and urethane emulsion have adhesiveness with thermally foamable particles and adhesiveness between the coating layer formed by applying this coating liquid and the base paper. It is good and does not hinder the expansion / foaming of the thermally foamable particles, and can prevent the packaged object from being damaged.
さらにまた、バインダのガラス転移温度(Tg)が30〜70℃、好ましくは40〜60℃であると、熱発泡性粒子の膨張・発泡を阻害することがなく、良好に発泡させることができる。また熱発泡性粒子との接着性、及び塗工層と基紙との接着性に優れる。さらにまた、塗工層の乾燥後は、本紙又は板紙の表面強度を向上させることができる。 Furthermore, when the glass transition temperature (Tg) of the binder is 30 to 70 ° C., preferably 40 to 60 ° C., expansion and foaming of the thermally foamable particles are not hindered, and foaming can be performed satisfactorily. Moreover, it is excellent in the adhesiveness with a thermally foamable particle and the adhesiveness of a coating layer and a base paper. Furthermore, the surface strength of the paper or paperboard can be improved after the coating layer is dried.
バインダのガラス転移温度(Tg)が30℃未満であると、段ボールシートへの貼合時にコルゲータの熱板にバインダが取られるという問題が発生し易い。一方、バインダのガラス転移温度(Tg)が70℃を超えると、紙又は板紙の表面強度の向上効果には優れるものの、熱発泡性粒子の膨張・発泡を阻害してしまうため、本願の所望とするクッション性を得ることができない。 When the glass transition temperature (Tg) of the binder is less than 30 ° C., a problem that the binder is easily taken on the hot plate of the corrugator at the time of bonding to the corrugated cardboard sheet is likely to occur. On the other hand, if the glass transition temperature (Tg) of the binder exceeds 70 ° C., although it is excellent in the effect of improving the surface strength of paper or paperboard, it inhibits the expansion / foaming of the thermally foamable particles. It is not possible to obtain cushioning properties.
なお、上述したように本紙又は板紙の塗工層には、このような強い力が加わっても塗工層(クッション層)が割れないこと、塗工層が基紙から浮き上がって剥れないことが要求される。このため、熱発泡性粒子及びバインダは、固形分比率で7〜50:93〜50の割合で塗工層中に含有されることが好ましい。 In addition, as described above, the coating layer of the main paper or paperboard does not break the coating layer (cushion layer) even if such a strong force is applied, and the coating layer does not lift and peel off from the base paper. Is required. For this reason, it is preferable that a thermally foamable particle and a binder are contained in a coating layer in the ratio of 7-50: 93-50 by solid content ratio.
熱発泡性粒子の比率が7質量%未満であると熱発泡性粒子を十分に発泡させたとしても本願の所望とするクッション性を得ることができない。一方、熱発泡性粒子の比率が50質量%を超えると、熱発泡性粒子とバインダとの接着性が低下し、熱発泡性粒子の離脱を生じるおそれがある。 If the ratio of the heat-expandable particles is less than 7% by mass, the desired cushioning property of the present application cannot be obtained even if the heat-expandable particles are sufficiently expanded. On the other hand, when the ratio of the heat-expandable particles exceeds 50% by mass, the adhesiveness between the heat-expandable particles and the binder is lowered, and the heat-expandable particles may be detached.
なお、本紙又は板紙の基紙の少なくとも片面に塗工される塗工液は、上述したように少なくとも熱発泡性粒子とバインダとが含有されていれば、その他、必要に応じて、顔料、消泡剤、分散剤、粘性調整剤等の公知の種々のものが含有されていても良い。 As described above, the coating liquid applied to at least one side of the base paper or the paperboard base sheet contains at least a thermally foamable particle and a binder as described above. Various known materials such as a foaming agent, a dispersing agent, and a viscosity adjusting agent may be contained.
以上のように構成される本紙又は板紙に使用される塗工液は40〜70質量%、好ましくは45〜65質量%の塗被組成物(固形分)を含んでいる。 The coating liquid used for the main paper or paperboard constituted as described above contains 40 to 70% by mass, preferably 45 to 65% by mass of the coating composition (solid content).
上述したように少なくとも熱発泡性粒子とバインダとを含む塗工液は、固形分換算で基紙の片面当たりに16〜120g/m2、好ましくは40〜100g/m2、より好ましくは52〜100g/m2塗布される。塗工液の塗工量が16g/m2未満であると、クッション性、傷入り防止性が低い。一方、塗工量が120g/m2を超えると、クッション性、被包装物の傷入り防止効果には優れるものの、基紙とクッション層との接着不良、大幅な生産性の低下、コストアップを招くこととなる。 As described above, the coating liquid containing at least thermally foamable particles and a binder is 16 to 120 g / m 2 , preferably 40 to 100 g / m 2 , more preferably 52 to 52 per side of the base paper in terms of solid content. 100 g / m 2 is applied. When the coating amount of the coating liquid is less than 16 g / m 2 , cushioning properties and scratch resistance are low. On the other hand, when the coating amount exceeds 120 g / m 2 , the cushioning property and the effect of preventing damage to the packaged article are excellent, but the adhesion between the base paper and the cushion layer is poor, the productivity is greatly reduced, and the cost is increased. Will be invited.
なお、塗工液を基紙の少なくとも片面に塗布する方法としては、バーコータ、ロッドコータ、エアナイフ等の公知の塗工手段を用いることができる。また、グラビア印刷機、フレキソ印刷機等の公知の印刷手段により印刷し、基紙の少なくとも片面に塗工層を設けることもできる。 In addition, as a method for applying the coating liquid to at least one surface of the base paper, known coating means such as a bar coater, a rod coater, an air knife or the like can be used. Moreover, it can print by well-known printing means, such as a gravure printing machine and a flexographic printing machine, and can also provide a coating layer in the at least single side | surface of a base paper.
しかしながら、一般的な印刷用塗被紙の塗工量と比べて、本紙又は板紙の基紙の少なくとも片面に塗布される塗工液の塗工量は非常に多く、抄紙機で塗布することは難しい。このため、本願発明では、特に印刷機で多層塗工することが好ましい。印刷機では、複数の印刷ユニットを使用して多層塗工することができ、特に4〜12ユニットの印刷ユニットを持つフレキソ印刷機で、基紙の表面に塗工液を塗布することが効果的である。 However, compared to typical coating amount of the coated paper for printing, coating amount of the coating fluid is applied to at least one surface of the base paper of newspaper or paperboard are numerous, it is applied in a paper machine difficult. For this reason, in this invention, it is preferable to apply multilayer coating with a printing machine. The printing press may be a multilayer coating using a plurality of printing units, especially flexo printing machine with printing units having 4 to 12 units, it is effective to apply the coating liquid to the surface of the base paper It is.
なお、塗工液をフレキソ印刷機で塗布する場合には、ザーンカップNo.4(25℃)で測定した値で8〜30秒、好ましくは15〜20秒となるように塗工液の粘度を調整する。塗工液の粘度が8秒未満であると、塗工液をアニロックスロールで保持することが難しくなり、塗工ムラが発生したり、本願の所望とする塗工量を塗布することができないという問題が発生しやすくなる。一方、塗工液の粘度が30秒を超えるとアニロックスロールへ均等に塗工液を供給することが難しく、塗工ムラが発生しやすくなる。 When applying the coating liquid with a flexographic printing machine, the Zahn cup no. The viscosity of the coating solution is adjusted so that the value measured at 4 (25 ° C.) is 8 to 30 seconds, preferably 15 to 20 seconds. When the viscosity of the coating liquid is less than 8 seconds, it becomes difficult to hold the coating liquid with an anilox roll, and uneven coating occurs, or the desired coating amount of the present application cannot be applied. Problems are likely to occur. On the other hand, when the viscosity of the coating solution exceeds 30 seconds, it is difficult to uniformly supply the coating solution to the anilox roll, and coating unevenness is likely to occur.
上述したように形成された本紙又は板紙の塗工層を含む坪量は、被包装物の内容や、本紙又は板紙が加工される段ボールケース等の包装容器、クッション材の大きさ、形状、重さ等の使用方法によっても変化するが、180〜500g/m2の範囲内にあることが好ましく、180〜400g/m2の範囲にあることがより好ましい。本紙又は板紙の坪量が180g/m2未満であると、本紙又は板紙が段ボールケース等の包装容器、クッション材に加工された際、包装容器、クッション材としての強度、剛性が劣る。また、基紙の少なくとも片面に塗工層を設け、クッション層を形成しても、基紙が薄いため、本願の所望とするクッション性、傷入り防止効果、段入り防止効果を得にくくなる。一方、本紙又は板紙の坪量を500g/m2より大きくしても、過剰品質となると共に、製造コストが高くなるだけである。 The basis weight including the coated layer of the paper or paperboard formed as described above is the content of the packaged item, the packaging container such as the cardboard case in which the paper or paperboard is processed, the size, shape, and weight of the cushioning material. Although also vary according to the use of such is, is preferably in the range of 180~500g / m 2, more preferably in the range of 180~400g / m 2. When the basis weight of the paper or paperboard is less than 180 g / m 2 , when the paper or paperboard is processed into a packaging container or cushion material such as a cardboard case, the strength and rigidity as the packaging container and cushion material are inferior. Further, even if a coating layer is provided on at least one side of the base paper and the cushion layer is formed, the base paper is thin, so that it is difficult to obtain the desired cushioning property, damage prevention effect, and step prevention effect. On the other hand, even if the basis weight of the main paper or paperboard is larger than 500 g / m 2 , the quality is excessive and the manufacturing cost is only increased.
また、本紙又は板紙が、ガラス製品やプラスチック製品等の表面に傷が入りやすく、損傷しやすい小物製品を包装する際に用いられる包装容器やクッション材に加工される場合には、基紙としてクラフト紙や薄用紙を用いることが好ましい。なお、このような用途の場合には、塗工層を含む本紙又は板紙の坪量は100g/m2以下のものであることが好ましい。このような坪量の基紙の少なくとも片面に塗工層を設け、クッション層を形成しても、本願の所望とするクッション性、傷入り防止効果、段入り防止効果を得ることができる。 In addition, when paper or paperboard is processed into a packaging container or cushion material used when packaging small products that are easily damaged by the surface of glass products, plastic products, etc., kraft as the base paper It is preferable to use paper or thin paper. In addition, in the case of such a use, it is preferable that the basic weight of this paper or paperboard containing a coating layer is 100 g / m < 2 > or less. Even if a coating layer is provided on at least one side of the base paper having such a basis weight and the cushion layer is formed, the desired cushioning property, scratch prevention effect and step prevention effect can be obtained.
基紙の表面に塗工液を塗布して塗工層を形成した後、乾燥工程で加熱して乾燥させ、同時に塗工層中の熱発泡性粒子を発泡させて塗工層をクッション層とする。 After applying the coating liquid to the surface of the base paper to form a coating layer, the coating layer is heated and dried in a drying process, and at the same time, the foamed thermally foamable particles in the coating layer are foamed to form the coating layer as a cushion layer. To do.
乾燥工程における乾燥温度は100〜120℃が好ましい。100〜120℃の熱風であると、塗工層中の水分を蒸発させて乾燥するとともに、この乾燥工程において、塗工層をクッション層とすることができる。乾燥温度が100℃未満であると塗工層中の熱発泡性粒子の発泡が不足し所望のクッション性を得ることが難しくなる。一方、乾燥温度が120℃を超えると乾燥時間にもよるが、過熱により熱発泡性粒子が最大膨張率を過ぎ、収縮するおそれがある。 The drying temperature in the drying step is preferably 100 to 120 ° C. When the hot air is 100 to 120 ° C., the moisture in the coating layer is evaporated and dried, and in this drying step, the coating layer can be used as a cushion layer. When the drying temperature is less than 100 ° C., foaming of the heat-expandable particles in the coating layer is insufficient, and it becomes difficult to obtain a desired cushioning property. On the other hand, when the drying temperature exceeds 120 ° C., although depending on the drying time, the heat-expandable particles may exceed the maximum expansion rate due to overheating and may shrink.
さらにまた、本紙又は板紙は、塗工層に含有される熱発泡性粒子を、塗工液を乾燥する際の加熱(1次加熱)と、例えば本紙又は板紙を段ボールシートに貼合加工する際のコルゲータの熱板による加熱(2次加熱)の2段階の加熱で発泡させることが好ましい。すなわち、塗工層(塗工液)の乾燥工程において熱発泡性粒子を最大膨張率以下まで膨張させ、その後、本紙又は板紙を例えば段ボールシートに貼合加工する際のコルゲータの熱板の熱を利用して、段ボールシート貼合後に熱発泡性粒子を完全に発泡させることが好ましい。塗工、乾燥時に熱発泡性粒子を完全に発泡させると、後のコルゲータの熱板の熱により、熱発泡性粒子が最大膨張率を過ぎ、逆に収縮してしまうおそれがあるからである。 Furthermore, the main paper or paperboard is obtained by heating the heat-expandable particles contained in the coating layer when the coating liquid is dried (primary heating), for example, when bonding the main paper or paperboard to a corrugated cardboard sheet. The foaming is preferably performed by two-stage heating of the corrugator using a hot plate (secondary heating). That is, in the drying step of the coating layer (coating liquid), the heat-expandable particles are expanded to a maximum expansion rate or less, and then the heat of the corrugator hot plate when the main paper or paperboard is bonded to a corrugated cardboard sheet, for example. Utilizing it, it is preferable to completely foam the thermally foamable particles after bonding the corrugated cardboard sheet. This is because if the heat-expandable particles are completely foamed during coating and drying, the heat-expandable particles may exceed the maximum expansion coefficient due to the heat of the hot plate of the subsequent corrugator and conversely shrink.
また、塗工、乾燥後は本紙又は板紙を巻き取るため、特に巻取りの紙管際、すなわち巻き始めの部分は、巻き終わりの部分よりも相当大きな圧力を受ける。従って、巻取りの紙管際は、圧力により、せっかく得たクッション層が潰されてしまい、クッション性が低下するおそれがある。 In addition, since the main paper or paperboard is taken up after coating and drying, the paper core of the take-up, that is, the part at the beginning of winding, is subjected to a considerably larger pressure than the part at the end of winding. Therefore, at the time of winding the paper tube, the cushion layer obtained with great pressure is crushed by the pressure, and the cushioning property may be lowered.
上記により得た本紙又は板紙をコルゲータで貼合し段ボールシートとする。 The paper or board obtained as described above is bonded with a corrugator to obtain a corrugated cardboard sheet.
なお、コルゲータの熱板の温度は150〜180℃とし、紙表面の温度が80〜130℃になるように調整することが好ましい。これにより、過熱量による熱発泡性粒子の収縮を防止でき、適切に熱発泡性粒子を膨張させ、所望のクッション性を得ることができる。 The temperature of the corrugator hot plate is preferably 150 to 180 ° C., and the temperature of the paper surface is preferably adjusted to 80 to 130 ° C. Thereby, shrinkage | contraction of the heat-expandable particle | grain by the amount of overheating can be prevented, a heat-expandable particle can be expanded appropriately, and desired cushioning properties can be obtained.
上述したようにして得られる本紙又は板紙は、下記の測定方法により測定したクッション性が0.40〜0.50、好ましくは0.41〜0.45である。 The paper or paperboard obtained as described above has a cushioning property of 0.40 to 0.50, preferably 0.41 to 0.45, measured by the following measuring method.
クッション性の測定方法は以下の通りである。
(1)被衝突物体として、表面が平坦で頑丈な試験台を用い、試験サンプルのクッション層が表面になるように固定する。
(2)試験サンプルの表面に衝突物体として鉄球(パチンコ玉)を用い、30cmの高さから試験サンプルに対して垂直に落下させる。
(3)鉄球落下時の跳ね返りをビデオ撮影し、落下方向にセットした物差しにより跳ね返りの高さをmm単位で測定した。
(4)鉄球の落下の高さ、跳ね返りの高さの測定値を用い、下記の(式1)により反発係数を算出した。
(式1)
e=√(h/ho) (e:反発係数、ho:落下の高さ、h:跳ね返りの高さ)
(0≦e≦1)
(5)すなわち、この反発係数をクッション性の指標とし、反発係数が大きいほどクッション性が高いと判断した。
The measuring method of cushioning properties is as follows.
(1) As a collision object, use a flat and sturdy test stand with a flat surface, and fix the cushion layer of the test sample so that it becomes the surface.
(2) Using an iron ball (pachinko ball) as a collision object on the surface of the test sample, it is dropped vertically from the height of 30 cm to the test sample.
(3) The rebound when the iron ball dropped was video-recorded, and the height of the rebound was measured in mm with a ruler set in the direction of fall.
(4) The coefficient of restitution was calculated according to the following (Equation 1) using the measured values of the drop height and the bounce height of the iron ball.
(Formula 1)
e = √ (h / ho) (e: coefficient of restitution, ho: height of fall, h: height of bounce)
(0 ≦ e ≦ 1)
(5) That is, this restitution coefficient was used as an index of cushioning properties, and it was determined that the cushioning properties were higher as the restitution coefficient was larger.
本紙又は板紙は、このような測定方法で測定したクッション性が0.40〜0.50であるので、優れたクッション性、型入り防止効果、傷入り防止効果を有する。従って、本紙又は板紙が、段ボールケース等の包装容器、クッション材に加工されて用いられた場合、不織布や気泡クッション材のような保護材料やクッション材料を使用しなくとも、被包装物の型入りを防止し、傷入りを防止することができる。 Since the cushion property measured by such a measuring method is 0.40 to 0.50, the present paper or paperboard has an excellent cushion property, an anti-mold effect, and an anti-scratch effect. Therefore, if this paper or paperboard is processed into a packaging container such as a cardboard case or a cushioning material, it can be put into the package without using a protective material or cushioning material such as a nonwoven fabric or a bubble cushioning material. Can be prevented, and scratches can be prevented.
本発明に係るクッション機能を備える紙又は板紙の効果を確認するため、以下のような各種の試料を作製し、これらの各試料に対する品質を評価する試験を行った。なお、本実施例において、配合、濃度等を示す数値は、固形分又は有効成分の質量基準の数値である。また、本実施例で示す薬品等は一例にすぎないので、本発明はこれらの実施例によって制限を受けるものではなく、適宜選択可能であることはいうまでもない。 In order to confirm the effect of the paper or paperboard having the cushion function according to the present invention, the following various samples were prepared, and a test for evaluating the quality of each of these samples was performed. In addition, in a present Example, the numerical value which shows a mixing | blending, a density | concentration, etc. is a numerical value of the solid content or the mass reference | standard of an active ingredient. Moreover, since the chemical | medical agent etc. which are shown in a present Example are only examples, it cannot be overemphasized that this invention is not restrict | limited by these Examples, and can be selected suitably.
本発明に係る24種類のクッション機能を備える紙又は板紙(これを「実施例1」ないし「実施例24」とする)と、これらの実施例1ないし実施例24と比較検討するために、2種類の紙又は板紙(これを「比較例1」及び「比較例2」とする)を、表1に示すような構成で作製した。また、参考例として市販の板紙(これを「比較例3」とする)、市販の不織布(これを「比較例4」とする)を評価した。 To compare with the paper or paperboard comprising 24 different cushioning function according to the present invention (to no "Example 1" This is referred to as "Example 24"), and these Examples 1 through 24, 2 Various types of paper or paperboard (referred to as “Comparative Example 1” and “Comparative Example 2”) were prepared as shown in Table 1. Moreover, as a reference example, a commercially available paperboard (referred to as “Comparative Example 3”) and a commercially available nonwoven fabric (referred to as “Comparative Example 4”) were evaluated.
<基紙>
基紙として、坪量が220g/m2である市販の段ボール用原紙(大王製紙株式会社製の商品名「ジャストKライナー」)を用いた。なお、この段ボール用原紙の表面のベック平滑度は18秒であった。
<塗工液の調整>
熱発泡性粒子として、マツモト油脂製薬株式会社製の「マツモトマイクロスフェアF−46」を塗工層に対して固形分換算で10質量%、またバインダとして、御国色素株式会社製のアクリル系エマルション「バインダCF」を塗工層に対して固形分換算で45質量%含有するように塗工液を作成し、調整した。なお、調整後の塗工液のザーンカップNo.4(25℃)で測定した粘度は18秒であった。また、表1中の塗工液のバインダの種類の欄の「ア」とは、アクリル系エマルションを示す。
<Base paper>
As the base paper, a commercially available cardboard base paper having a basis weight of 220 g / m 2 (trade name “Just K Liner” manufactured by Daio Paper Co., Ltd.) was used. The Beck smoothness of the surface of the cardboard base paper was 18 seconds.
<Adjustment of coating solution>
As a thermally foamable particle, “Matsumoto Microsphere F-46” manufactured by Matsumoto Yushi Seiyaku Co., Ltd. is 10% by mass in terms of solid content with respect to the coating layer. A coating solution was prepared and adjusted so as to contain “binder CF” in an amount of 45 mass% in terms of solid content with respect to the coating layer. The adjusted coating solution Zahn cup No. The viscosity measured at 4 (25 ° C.) was 18 seconds. In Table 1, “A” in the column of the binder type of the coating liquid indicates an acrylic emulsion.
<クッション機能を備えた板紙の製造>
基紙である段ボール原紙の表面(片面)に、フレキソ印刷機で塗工液を固形分換算で55g/m2塗工して塗工層を形成した後、110℃の熱風乾燥機にて15秒間熱発泡性粒子を1次加熱して膨張(発泡)させて塗工層をクッション層とし、坪量275g/m2の板紙(実施例1)を得た。
<Manufacture of paperboard with cushion function>
A coating layer is formed on the surface (one side) of a baseboard corrugated cardboard using a flexographic printing machine to form a coating layer by converting to 55 g / m 2 in terms of solid content, and then a hot air dryer at 110 ° C. 15 The thermally foamable particles were primarily heated for 2 seconds to expand (foam), and the coating layer was used as a cushion layer to obtain a paperboard (Example 1) having a basis weight of 275 g / m 2 .
さらに、実施例1を得た後、段ボールシートへの貼合加工を想定し、150℃の熱風乾燥機に10秒間いれて2次加熱を行い、熱発泡性粒子を完全に発泡させた。なお、この時クッション層の温度は125℃であった。 Furthermore, after obtaining Example 1, the bonding process to a corrugated cardboard sheet was assumed, and it put into a 150 degreeC hot air dryer for 10 second, and performed the secondary heating, and the thermally foamable particle was completely foamed. At this time, the temperature of the cushion layer was 125 ° C.
(実施例2〜6)
熱発泡性粒子の含有量、熱発泡性粒子とバインダとの固形分比率、及び塗工液中の固形分量を表1に示すように変更したこと以外は、実施例1と同様にして得たクッション機能を備える板紙。
(Examples 2 to 6)
It was obtained in the same manner as in Example 1 except that the content of the heat-foamable particles, the solid content ratio between the heat-foamable particles and the binder, and the solid content in the coating liquid were changed as shown in Table 1. Paperboard with a cushion function.
(実施例7〜9)
熱発泡性粒子の含有量、バインダの含有量、熱発泡性粒子とバインダとの固形分比率、及び塗工液中の固形分量を表1に示すように変更したこと以外は、実施例1と同様にして得たクッション機能を備える板紙。
(Examples 7 to 9)
Example 1 except that the content of the heat-expandable particles, the content of the binder, the solid content ratio of the heat-expandable particles and the binder, and the solid content in the coating liquid were changed as shown in Table 1. A paperboard having a cushion function obtained in the same manner.
(実施例10〜16)
熱発泡性粒子の含有量、熱発泡性粒子とバインダとの固形分比率、塗工液中の固形分量、塗工液の塗工量、及び坪量を表1に示すように変更したこと以外は、実施例1と同様にして得たクッション機能を備える板紙。
(Examples 10 to 16)
Other than changing the content of the heat-foamable particles, the solid content ratio between the heat-foamable particles and the binder, the solid content in the coating liquid, the coating amount of the coating liquid, and the basis weight as shown in Table 1. Is a paperboard having a cushion function obtained in the same manner as in Example 1.
(実施例17)
熱発泡性粒子の含有量、バインダの種類、熱発泡性粒子とバインダとの固形分比率、及び塗工液中の固形分量を表1に示すように変更したこと以外は、実施例1と同様にして得たクッション機能を備える板紙。なお、表中のバインダの種類の欄の「SBR」とはスチレン−ブタジエン系ラテックスを表し、本実施例ではSBRとして日本ゼオン株式会社製の「Nipol LX」を用いた。
(Example 17)
Example 1 except that the content of the heat-expandable particles, the type of binder, the solid content ratio between the heat-expandable particles and the binder, and the solid content in the coating liquid were changed as shown in Table 1. Paperboard with a cushion function. In the table, “SBR” in the column of the binder type represents styrene-butadiene latex, and “Nipol LX” manufactured by Nippon Zeon Co., Ltd. was used as SBR in this example.
(実施例18〜23)
熱発泡性粒子の含有量、バインダのガラス転移温度、熱発泡性粒子とバインダとの固形分比率、及び塗工液中の固形分量を表1に示すように変更したこと以外は、実施例1と同様にして得たクッション機能を備える板紙。
(Examples 18 to 23)
Example 1 except that the content of the thermally foamable particles, the glass transition temperature of the binder, the solid content ratio between the thermally foamable particles and the binder, and the solid content in the coating liquid were changed as shown in Table 1. A paperboard with a cushion function obtained in the same manner as above.
(実施例24)
熱発泡性粒子の含有量、熱発泡性粒子とバインダとの固形分比率、及び塗工液中の固形分量を表1に示すように変更し、また熱発泡性粒子を1次発泡のみで膨張・発泡させたこと以外は、実施例1と同様にして得たクッション機能を備える板紙。
(Example 24)
The content of the heat-expandable particles, the solid content ratio between the heat-expandable particles and the binder, and the solid content in the coating liquid are changed as shown in Table 1, and the heat-expandable particles are expanded only by primary foaming. A paperboard having a cushion function obtained in the same manner as in Example 1 except that foaming was performed.
(比較例1)
熱発泡性粒子の含有量(すなわち熱発泡性粒子を含有しなかった)、熱発泡性粒子とバインダとの固形分比率、及び塗工液中の固形分量を表1に示すように変更したこと以外は、実施例1と同様にして得た板紙。
(Comparative Example 1)
The content of the heat-expandable particles (that is, not containing the heat-expandable particles), the solid content ratio between the heat-expandable particles and the binder, and the solid content in the coating liquid were changed as shown in Table 1. A paperboard obtained in the same manner as in Example 1 except for the above.
(比較例2)
熱発泡性粒子の含有量、バインダの含有量(すなわちバインダを含有しなかった)、熱発泡性粒子とバインダとの固形分比率、及び塗工液中の固形分量を表1に示すように変更したこと以外は、実施例1と同様にして得た板紙。
(Comparative Example 2)
Table 1 shows the contents of the heat-expandable particles, the binder content (that is, no binder), the solid content ratio between the heat-expandable particles and the binder, and the solid content in the coating liquid. A paperboard obtained in the same manner as in Example 1 except that.
(比較例3)
本実施例1〜24、比較例1〜2で用いた基紙、すなわち坪量が220g/m2である市販の段ボール用原紙(大王製紙株式会社製の商品名「ジャストKライナー」)を比較例3とした。なお、比較例3では塗工層(クッション層)を設けていない。
(Comparative Example 3)
Compare the base paper used in Examples 1 to 24 and Comparative Examples 1 and 2, that is, a commercially available cardboard base paper having a basis weight of 220 g / m 2 (trade name “Just K Liner” manufactured by Daio Paper Co., Ltd.). Example 3 was used. In Comparative Example 3, no coating layer (cushion layer) is provided.
(比較例4)
坪量が50g/m2である市販の不織布を比較例4とした。なお、比較例4では塗工層(クッション層)を設けていない。
(Comparative Example 4)
A commercially available nonwoven fabric having a basis weight of 50 g / m 2 was defined as Comparative Example 4. In Comparative Example 4, no coating layer (cushion layer) is provided.
なお、表1中の「坪量(g/m2)」とは、基紙に所定のクッション層を設けた後の紙又は板紙の坪量で、JIS−P8142に記載の「紙及び板紙―坪量測定方法」に準拠して測定した値である。 In addition, “basis weight (g / m 2 )” in Table 1 is the basis weight of paper or paperboard after a predetermined cushion layer is provided on the base paper, and “paper and paperboard” described in JIS-P8142. It is the value measured based on "basis weight measuring method".
これらの全実施例及び比較例について品質評価、すなわちクッション性、傷入り防止性、及び基紙と塗工層との接着性を評価する試験を行った結果は、表2に示すとおりであった。なお、これらの評価試験はJIS−P8111に準拠して温度23℃±1℃、湿度50±2%の環境条件の下で行った。 Table 2 shows the results of quality evaluation, i.e., cushioning property, scratch resistance, and test for evaluating the adhesion between the base paper and the coating layer for all of these Examples and Comparative Examples. . These evaluation tests were performed under environmental conditions of temperature 23 ° C. ± 1 ° C. and humidity 50 ± 2% in accordance with JIS-P8111.
表2中の「クッション性」とはクッション層によるクッション機能、すなわち被包装物と被包装物との間に起こる衝突や衝撃、あるいは板紙と被包装物との間に起こる衝突や衝撃をやわらげる機能について評価したものである。このクッション性の評価の指標として反発係数を用い、以下の手順で反発係数を算出して評価した。
(1)被衝突物体として、表面が平坦で頑丈な試験台を用い、試験サンプルのクッション層が表面になるように固定する。なお、試験台の天板は、ディーオン株式会社製の「セグラン」(45mm厚、比重1.6〜1.7、表面硬度 モース3〜4)を使用した。
(2)前記試験サンプルの表面に衝突物体としてパチンコ玉(直径11±0.01mm、重さ5.45±0.01g)を用い、30cmの高さから試験サンプルに対して垂直に落下させる。
(3)鉄球落下時の跳ね返りをビデオ撮影し、落下方向にセットした物差しにより跳ね返りの高さをmm単位で測定した。
(4)鉄球の落下の高さ及び跳ね返りの高さの測定値を用い、下記の計算式により反発係数を算出した。
e=√(h/ho) (e:反発係数、ho:落下の高さ、h:跳ね返りの高さ)
(0≦e≦1)
(5)すなわち、この反発係数をクッション性の指標とし、反発係数が大きいほどクッション性が高いと判断した。
“Cushioning” in Table 2 refers to a cushion function by the cushion layer, that is, a function that softens a collision or impact that occurs between the package and the package, or a collision or impact that occurs between the paperboard and the package. Is evaluated. The coefficient of restitution was used as an index for evaluating the cushioning property, and the coefficient of restitution was calculated and evaluated according to the following procedure.
(1) As a collision object, use a flat and sturdy test stand with a flat surface, and fix the cushion layer of the test sample so that it becomes the surface. In addition, “Seglan” (45 mm thickness, specific gravity 1.6 to 1.7, surface hardness Mohs 3 to 4) manufactured by Deon Co., Ltd. was used as the top plate of the test stand.
(2) A pachinko ball (diameter 11 ± 0.01 mm, weight 5.45 ± 0.01 g) is used as a collision object on the surface of the test sample, and dropped vertically from the height of 30 cm to the test sample.
(3) The rebound when the iron ball dropped was video-recorded, and the height of the rebound was measured in mm with a ruler set in the direction of fall.
(4) The coefficient of restitution was calculated by the following formula using the measured values of the drop height and the bounce height of the iron ball.
e = √ (h / ho) (e: coefficient of restitution, ho: height of fall, h: height of bounce)
(0 ≦ e ≦ 1)
(5) That is, this restitution coefficient was used as an index of cushioning properties, and it was determined that the cushioning properties were higher as the restitution coefficient was larger.
また、「傷入り防止性」とは、被包装物に対する傷入り防止性を評価したもので、JIS−P8136に記載の「板紙の耐摩耗強さ試験方法」に準拠して学振式耐摩擦試験機を用いて試験し評価したものである。その測定方法は下記のとおりである。
(1)試験機摩擦部には樹脂フィルム(0HPフィルム)をセットし、試験機しゅう動台に試験サンプルのクッション層が摩擦面になるようにセットした。
(2)試験機しゅう動台にセットされた試験サンプルには500gの荷重が加えられるようにし、200回摩擦させた時の樹脂フィルム面の傷入り度合いを目視で評価し、その評価基準は下記の4段階とした。
(評価基準)
◎:不織布よりも優れる。
○:不織布と同等である。
△:不織布よりも劣る。
×:改善効果がない、または少ない。
“Scratch resistance” is an evaluation of the scratch resistance against an object to be packaged, and is based on the “Gear-proof abrasion resistance test method” described in JIS-P8136. Tested and evaluated using a testing machine. The measuring method is as follows.
(1) A resin film (0HP film) was set on the friction part of the test machine, and the test sample was placed on the sliding table so that the cushion layer of the test sample became a friction surface.
(2) A load of 500 g was applied to the test sample set on the tester sliding base, and the degree of scratches on the resin film surface when it was rubbed 200 times was visually evaluated. It was made into four steps.
(Evaluation criteria)
(Double-circle): It is superior to a nonwoven fabric.
○: Equivalent to non-woven fabric.
(Triangle | delta): It is inferior to a nonwoven fabric.
X: There is little or no improvement effect.
さらにまた、「基紙と塗工層との接着性」とは、JIS−P8115に記載の「紙及び板紙―耐折強さ試験方法―MIT試験機法」を用い、往復折り曲げ回数(耐折回数)5回後の試験サンプルを目視評価し、その評価基準は下記の4段階とした。
(評価基準)
◎:基紙と塗工層はしっかりと接着している
○:塗工層がやや剥離気味であるが問題なし
△:塗工層が剥離気味で問題の生じるおそれがある
×:塗工層が完全に剥離
Furthermore, “adhesiveness between the base paper and the coating layer” means “paper and paperboard—folding strength test method—MIT test machine method” described in JIS-P8115. Number of times) The test sample after 5 times was visually evaluated, and the evaluation criteria were as follows.
(Evaluation criteria)
◎: The base paper and the coating layer are firmly adhered ○: The coating layer is slightly peeled but there is no problem Δ: The coating layer is peeled and there is a possibility of causing a problem ×: The coating layer is Completely peeled
Claims (4)
前記熱発泡性粒子は、前記塗工層中に固形分換算で5〜20質量%含有されており、
前記塗工層は、前記熱発泡性粒子及びバインダを、乾燥させることにより前記熱発泡性粒子を発泡させてクッション層としたことを特徴とするクッション機能を備える包装容器用途の紙又は板紙。 Comprising at least a base paper and a coating layer provided by applying a coating liquid containing at least a thermally foamable particle and a binder having a glass transition temperature of 30 to 70 ° C. on at least one side of the base paper;
The thermally foamable particles are contained in the coating layer in an amount of 5 to 20% by mass in terms of solid content,
The coating layer, the thermal expandable particles and a binder, the packaging container applications of paper or paperboard having a cushioning function, characterized in that the said heat expandable particles by foaming the cushion layer by drying.
前記塗工液の塗工量は片面当たり固形分換算で16〜120g/m 2 であり、
乾燥温度100〜120℃である乾燥工程にて、前記塗工層をクッション層とし、且つ
前記塗工層を含む坪量が180〜500g/m 2 の範囲内であることを特徴とする請求項1に記載のクッション機能を備える包装容器用途の紙又は板紙。 The thermally foamed particles and the binder are contained in a solid content ratio of 7 to 50:93 to 50,
The coating amount of the coating liquid is 16 to 120 g / m 2 in terms of solid content per side ,
In the drying process at a drying temperature of 100 to 120 ° C., the coating layer is a cushion layer, and
The coating layer packaging applications of paper or paperboard comprising a cushioning function of claim 1, basis weight and being in the range of 180~500g / m 2 comprising a.
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JP5524588B2 (en) * | 2009-11-30 | 2014-06-18 | ポーラ化成工業株式会社 | Measurement method of skin characteristics using high-speed camera |
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JPH05247899A (en) * | 1992-03-03 | 1993-09-24 | Tomoegawa Paper Co Ltd | Composite paper |
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US9743190B2 (en) | 2015-03-31 | 2017-08-22 | Bose Corporation | Acoustic diaphragm |
US9769570B2 (en) | 2015-03-31 | 2017-09-19 | Bose Corporation | Acoustic diaphragm |
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