JP3644826B2

JP3644826B2 - Absorbent package

Info

Publication number: JP3644826B2
Application number: JP22145698A
Authority: JP
Inventors: 美次濱島; 弥生福原; 哲哉草川; 宏典河崎; 稔中西
Original assignee: Kao Corp
Current assignee: Kao Corp
Priority date: 1998-08-05
Filing date: 1998-08-05
Publication date: 2005-05-11
Anticipated expiration: 2018-08-05
Also published as: JP2000051265A

Description

【０００１】
【発明の属する技術分野】
本発明は、生理用ナプキンやパンティライナー等の吸収性物品を個別に包装した個装体に関し、生産性に優れた吸収性物品の個装体に関する。
【０００２】
【従来の技術及び発明の解決しようとする課題】
従来、生理用ナプキンやパンティライナー等の吸収性物品の個別包装材料としては、柔軟なポリエチレンフィルム等が用いられており、例えば、特開平１０−７２０５７号公報等に、剥離処理を施した包装材料の表面の光沢防止及びライン工程上の滑り性／加工性を改善すべく、表面にエンボス処理を施した包装材料が提案されている。
しかし、このような従来の個別包装材料では、吸収性物品の個装体を１０枚２０枚と多数整列させて複数個を収納した包装体を成形する際に、個装体同士が滑りやすい。特に吸収性物品が中央部分を盛り上げたり伸縮材料を配したりした厚みが不均一な立体形状を有する場合、個装体も部分的に盛り上がった厚みが不均一な立体形状を有しているため、更に滑り易く、一部整列状態から飛び出してしまう等、効率よく所定の整列包装ができず、生産性に劣る問題があった。
【０００３】
従って、本発明の目的は、吸収性物品の個装体を複数個整列包装しても、個装体が互いに滑らず、整列包装する際の取り扱い性が良く、生産性向上及びコストの低減に資する、吸収性物品の個装体を提供することにある。
【０００４】
【課題を解決するための手段】
本発明は、包装材料で個別に包装した吸収性物品の個装体において、上記包装材料の外面側は、a)平均表面粗さ（Ra）が２〜１５μｍの規則的なエンボス処理が施されたエンボス処理面を有し、b)該エンボス処理面同士の静摩擦係数が０．３５以上であり、且つ動摩擦係数が０．３以上であり、上記エンボス処理面におけるエンボスパターンが、複数の線状のエンボスを互いに交差させたエンボスパターンであり、上記包装材料の上記エンボス処理面が互いに当接したときに、該エンボス処理面同士の凸面と凹面とが鍵のように係合するように、エンボスの凸部の幅ａと凹部の幅ｂとの関係をａ≦ｂとしてあることを特徴とする吸収性物品の個装体を提供することにより上記目的を達成したものである。
【０００５】
【発明の実施の形態】
以下、本発明の吸収性物品の個装体の好ましい一実施形態について説明する。本実施形態の吸収性物品の個装体は、吸収性物品としての生理用ナプキン２を包装材料３で個別に包装してなり、図１及び２に示すように、吸収性物品の包装体１０に複数個積層収納される。
【０００６】
而して、本実施形態の包装体１０は、包装材料３の外面４側は、a)平均表面粗さ（Ra）が２〜１５μｍ、好ましくは２〜１０μｍの規則的なエンボス処理が施されたエンボス処理面５を有し、b)該エンボス処理面同士の静摩擦係数が０．３５以上、好ましくは０．４〜１．０であり、且つ動摩擦係数が０．３以上、好ましくは０．３５〜０．８である。
平均表面粗さ（Ra）が２μｍ未満では、目的とする個装体が互いに滑らない効果が得られず、１５μｍを超えると、エンボスが深すぎ、包装材料の裏面までエンボスが転写され、シリコン等の剥離処理（剥離自在とする処理）を施すとき、シリコンが均一に塗工されなくなる。
上記静摩擦係数が、０．３５未満もしくは動摩擦係数が０．３未満であると、立体的なナプキンを包装し多列に整列させた時に、互いに滑り易くなり、玉くずれが生じ、整列包装が出来なくなってしまう。
【０００７】
ここで、上記平均表面粗さ（Ra）、静摩擦係数及び動摩擦係数は、それぞれ、下記のように測定される。
平均表面粗さ（Ra）の測定方法；
測定方法を以下に示すが、以下に特に示していない条件はＪＩＳＢ０６０１に準じて測定する。
包装材料のサンプルを縦×横＝７０ｍｍ×２０ｍｍ及び２０ｍｍ×７０ｍｍで切り出し、７６ｍｍ×２６ｍｍのマイクロスライドグラスに、シワのない様に測定面以外の箇所をテープで固定して貼り付け、測定サンプルとする。この測定サンプルについて表面粗さ計〔東京精密（株）製商品名「ｓｕｒｆｃｏｍ３００Ｂ」〕により、５μｍ針、走査速度０．３ｍｍ／ｓｅｃ、４０ｍｍｇｆの荷重、ＴｒａｖｅｒｓｅＬｅｎｇｔｈ８ｍｍ、ＣｕｔＯｆｆ０．８ｍｍの測定条件で、装置の通常の測定方法に従って平均表面粗さＲａを測定する。
測定サンプルの縦方向（ｎ＝５）、横方向（ｎ＝５）計１０点のＲａを求め、その平均値を平均表面粗さ（Ｒａ）とした。
【０００８】
静摩擦係数及び動摩擦係数の測定方法；
測定方法を以下に示すが、以下に示していない測定条件は、ＪＩＳＫ−７１２５に準じて測定を行う。
包装材料のサンプルを縦×横＝１００ｍｍ×１００ｍｍで切り出し、測定サンプルとする。
次に、６３ｍｍ×６３ｍｍ×厚み７ｍｍのステンレス板につり手がついた機具（６３ｍｍ×６３ｍｍの正面及び背面を有し、６３ｍｍ×７ｍｍの側面を４面有し、一側面の中央につり手が設けられたステンレス製の治具）に、測定サンプルの測定面（包装材料のエンボス処理された外面）が表になるように、巻きつけ固定して、測定用の滑り片を得る。測定サンプルは、たるんだり、シワが出ないように、背面全面を覆い、つり手を通す穴を開けて貼りつけ（フィルムの縦方向をつり手と同じ方向に貼り付ける）、更に正面を、テープを用いて貼り付けてスベリ片を得る。
次いで、摩擦係数測定で滑らせる台（縦５００ｍｍ×横３００ｍｍのステンレス板）上に、包装材料のサンプルを縦×横＝２５０ｍｍ×１００ｍｍで切り出し、測定サンプルの測定面（包装材料のエンボス処理された外面）が表になるように、ステンレス板上にシワのないように、周りをテープで貼り付けて滑り測定台とする。（測定サンプルの縦方向とステンレス板の縦方向が同一となるようにする）
この滑り測定台を水平にした上に、上記スベリ片の背面を当接させておき、該スベリ片上にスベリ片と重りの荷重が計１ｋｇとなるように、荷重をかけて、引張速度２００ｍｍ／ｍｉｎ、引張距離６０ｍｍ、チャート速度３０ｍｍ／ｍｉｎの条件にて測定を行う。
得られたチャートより常法に準じて静摩擦係数を求め、更に動き出した後の平均荷重より動摩擦係数を求める。（摩擦係数としては、静摩擦力として０．３５ｋｇなら静摩擦係数０．３５となる。）
滑り測定台及びスベリ片に取り付けたサンプルの互いに縦方向同士の摩擦係数を５点及び、それぞれ横方向の摩擦係数を５点の計１０点の平均値を静摩擦係数及び動摩擦係数として求めた。
【０００９】
本形態において、エンボス処理面５は、包装材料３の外面４の全面に形成されている。エンボス処理面５のエンボスパターンは、包装材料３の縦と横どちらの方向にも滑り難くするために、線状のエンボスを互いに交差させたパターンとしてあり、具体的には、図４(a)に示す絹目エンボスパターンや図４(b)に示すダイヤ目エンボスパターン等が好ましく挙げられる。
【００１０】
エンボス処理面５におけるエンボスの凹凸のサイズは、好ましい静摩擦係数及び動摩擦係数を得るためには、下記のようにするのが好ましい。
規則的なピッチｃを、２０〜５００μｍとし、凸部５ａの幅ａを、１０〜２００μｍとし、凹部５ｂの幅ｂを、１０〜３００μｍとするのが好ましい。（凸部５ｂ、ピッチｃ、幅ａ及び幅ｂについては図４参照）。
規則的なピッチｃを２０μｍ以上、幅ａを１０μｍ以上、幅ｂを１０μｍ以上とするのは、エンボスパターンを最適化し、上述の摩擦係数を得るためであり、逆にｃを５００μｍ以下、ａを２００μｍ以下、ｂを３００μｍ以下とするのは、互いに係合する数を増やし、上述の摩擦係数を得るためである。
特に互いに当接するエンボス処理面５同士の凸面と凹面とを鍵のように係合させるために、凸部５ａの幅ａと凹部５ｂの幅ｂとの関係をａ≦ｂとしてある。
【００１１】
包装材料３の吸収性物品に当接される内面６は、平均表面粗さ（Ra）が、シリコーン等の剥離剤をムラなく均一に塗工する点から０〜３μｍであるのが好ましい。
この様に、内面のＲａ＝０〜３μｍ、外面のＲａ＝２〜１５μｍの異なる表面粗さを得る方法としては、フィルム自体に異なるエンボス処理を施す方法、特に、Ｔダイ等でフィルムを押し出した直下の冷却ロール及び受けロールとに所望の規則的なパターンエンボスを施したロール及び粗さＲａ＝０〜３μｍの粗さの小さいエンボスを施したロールを用い、押し出したフィルムを両ロール間に通して得る方法が最も好ましく用いられる。
【００１２】
本発明の包装材料３としては、ポリエチレン〔直鎖状低密度ポリエチレン（Ｌ−ＬＤＰＥ）、低密度ポリエチレン（ＬＤＰＥ）〕、ポリプロピレン、エチレン−酢酸ビニル共重合体（ＥＶＡ）、エチレン−アクリル酸共重合体（ＥＡ）、スチレン−イソプレン共重合体（ＳＩＳ）、スチレン−ブタジエン共重合体（ＳＢＳ）、オレフィン系エラストマー等の一種もしくは、それらの混合物からなるフィルムが用いられ、これらは単層体又は積層体として用いることができる。
本発明においては、エンボス処理面による効果をより良好にするために、包装材料の材料として、密度ρ＝０．９２以下である、ポリエチレン、ＥＶＡ、ＥＡ、ＳＢＳ、オレフィン系エラストマー等のゴム的な性質を有する低密度樹脂を配合し用いるのが好ましい。
また、剥離処理を施す場合には、剥離面に直接ずれ止め材となるホットメルトを塗工し製品に転着するため、耐熱性も要求されることから、内面側は密度ρ＝０．９３以上のポリエチレン及びポリプロピレン等の耐熱性を有する樹脂を用いるのが好ましい。
即ち、包装材料３の外面４の材料としては、上記低密度樹脂が好ましく、内面６の材料としては、上記高密度樹脂が好ましく、包装材料は、このような構造の２層以上の積層フィルムを押し出し成形してなるフィルムからなるのが最も好ましい。
【００１３】
上述の如く構成されてなる本形態の包装体１０は、包装材料３が上述の如く構成されているので、特に、図５及び６に示すように中央部の厚みが他の部位よりも厚く、厚みの不均一な立体形状を有する吸収性物品や弾性部材が配されて厚みの不均一な立体形状を有する吸収性物品（図示せず）、即ち、個装体とした際に厚みが不均一となり表面が非平面形状を形成するものの包装材料として好適である。
そして、上述の構成を有するため、包装材が配列した時エンボス処理面における凸面と凹面とが互いに鍵のように嵌合し、互いに滑り難くなる。従来の梨地面やマットエンボスでは、全体が互いに凸面と凹面とがかみ合わず、このような効果は得られない。このため、個装体を複数個整列包装する際の取り扱い性に優れ、生産性が良好で、コストの低減もはかれる。
【００１４】
本形態の包装体は、押し出し成形して原料フィルムを得、これにエンボス処理及び必要に応じて剥離処理を施す等して得られる包装材料３を、用いて、常法に従い、吸収性物品を個装し、得られた個装体を積層収納して、得られる。
【００１５】
【実施例】
〔実施例１（個装フィルムＡ）〕
樹脂組成物として、密度ρ＝０．９３５のＬ−ＬＤＰＥ６０ｗｔ％、密度ρ＝０．９２５のＬＤＰＥ４０ｗｔ％をブレンドしたものを用い、これをＴダイからフィルムとして単層で押し出した後、格子エンボス金属ロールと、受けロールとしてのゴムロールとの間を通してエンボスを転写させ、片面が規則的な格子状エンボスが施された、坪量２５ｇ／ｍ²のポリエチレンフィルムを得た。得られたフィルムのゴムロール面側に、剥離剤としてシリコンを塗工して乾燥させ、剥離処理を施したフィルム（外面側全面がエンボス処理面であり、内面側全面が剥離処理面であるフィルム）を得、これを個装フィルムＡとした。
【００１６】
〔実施例２（個装フィルムＢ）〕
樹脂組成が、密度ρ＝０．９３５のＬ−ＬＤＰＥ７０ｗｔ％、密度ρ＝０．９２５のＬＤＰＥ３０ｗｔ％である内面層（坪量２０ｇ／ｍ²）と、樹脂組成が密度ρ＝０．９１５のメタロセン触媒を用いて作られたＬ−ＬＤＰＥ７０ｗｔ％、密度ρ＝０．９２５のＬＤＰＥ３０ｗｔ％である外面層（坪量５ｇ／ｍ²）とを、Ｔダイからそれぞれ共押し出した後、外面層を、格子エンボスロール側にして、受けロールとしてのゴムロールとの間に通してエンボスを転写させ、外面層に規則的な格子エンボスが施された、坪量２５ｇ／ｍ²のポリエチレンフィルムを得た。得られたフィルムのゴムロール面側に、剥離剤としてシリコンを塗工し乾燥させ、剥離処理を施したフィルム（外面側全面がエンボス処理面であり、内面側全面が剥離処理面であるフィルム）を得、これを個装フィルムＢとした。
【００１７】
〔比較例１（個装フィルムＣ）〕
実施例１と同じ樹脂組成物を、Ｔダイから単層で押し出した後、梨地エンボスロールと、受けロールとしてのゴムロールとの間に通してエンボスを転写させ、梨地エンボスが施された、坪量２５ｇ／ｍ²のポリエチレンフィルムを得た。得られたフィルムのゴムロール面側に、剥離剤としてシリコンを塗工し乾燥させ、剥離処理を施したフィルム（外面側全面にエンボス処理面であり、内面側全面が剥離処理面であるフィルム）を得、これを個装フィルムＣとした。
【００１８】
〔比較例２（個装フィルムＤ）〕
実施例１と同じ樹脂組成物を、Ｔダイから単層で押し出した後、比較例１よりも粗い梨地エンボスロールと、受けロールとしてのゴムロールとの間に通してエンボスを転写させ、梨地エンボスが施された、坪量２５ｇ／ｍ²のポリエチレンフィルムを得た。得られたフィルムのゴムロール面側に、剥離剤としてシリコンを塗工し乾燥させ、剥離処理を施したフィルム（外面側全面にエンボス処理面であり、内面側全面が剥離処理面であるフィルム）を得、これを個装フィルムＤとした。
【００１９】
得られた個装フィルムＡ〜Ｄに関して、外面（シリコン背面）とシリコン面の平均表面粗さ（Ｒａ）及び、外面同志の静摩擦係数と動摩擦係数を測定し、結果を〔表１〕に示した。
また得られたフィルムの加工性を評価すべく、図５に示す様な、ナプキンの中央部に中高の吸収体（２ａ）を設けた、中央部分が部分的に厚みが厚く、厚みが不均一なナプキンの包装材として使い、それぞれ個装体を得、それらを図１、図２に示す様に、２０枚並べて、内装するテストを行いその結果を〔表１〕に示した。
【００２０】
〔個装フィルムの加工性評価〕
○；２０枚整列させ、まとめてパック詰めしても、個装体同士の滑りがなく、トラブルなく包装可能であった。
×；２０枚整列させ、まとめてパック詰めすると、個装体同士が滑り整列したものが崩れ、包装できなかった。
【００２１】
【表１】

【００２２】
【発明の効果】
本発明の吸収性物品の個装体は、吸収性物品の個装体を複数個整列包装しても、個装体が互いに滑らず、整列包装する際の取り扱い性が良く、生産性向上及びコストの低減に資する。
【図面の簡単な説明】
【図１】図１は、本発明の吸収性物品の個装体を複数個収納してなる包装体の一部破断斜視図である。
【図２】図２は、図１のＺ−Ｚ線断面図である。
【図３】図３は、本発明の個装体の斜視図である。
【図４】図４(a) 及び(b) は、それぞれ、本発明の吸収性物品の包装材料の要部を示す一部拡大図（図３のＸ部拡大図）である。
【図５】図５は、図３に示す個装体の展開図である。
【図６】図６は、図３に示す個装体のＹ−Ｙ断面図である。
【符号の説明】
１個装体
２吸収性物品
３包装材料
４外面
５エンボス処理面
６内面
１０包装体[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an individual package in which absorbent articles such as sanitary napkins and panty liners are individually packaged, and to an individual package of an absorbent article having excellent productivity.
[0002]
[Background Art and Problems to be Solved by the Invention]
Conventionally, as an individual packaging material for absorbent articles such as sanitary napkins and panty liners, a flexible polyethylene film or the like has been used. For example, a packaging material subjected to a peeling treatment in Japanese Patent Application Laid-Open No. 10-72057 or the like. In order to improve the glossiness of the surface and the slipperiness / workability in the line process, a packaging material having an embossed surface has been proposed.
However, in such a conventional individual packaging material, the individual packages are easily slipped when forming a package containing a plurality of absorbent articles 10 aligned with 20 sheets of absorbent articles. In particular, when the absorbent article has a three-dimensional shape with a non-uniform thickness that is raised at the center or with an elastic material, the individual package also has a non-uniform three-dimensional shape with a partially raised thickness. In addition, it is more slippery and partly jumps out of the aligned state, so that predetermined aligned packaging cannot be efficiently performed, resulting in poor productivity.
[0003]
Therefore, the object of the present invention is to improve the productivity and reduce the cost, even if a plurality of individual packages of absorbent articles are aligned and packaged, the individual packages do not slip each other, and the packaging is easy to handle. It is to provide an individual package of absorbent articles that contributes.
[0004]
[Means for Solving the Problems]
The present invention relates to an individual package of absorbent articles individually packaged with a packaging material. The outer surface side of the packaging material is subjected to a regular embossing treatment with a) an average surface roughness (Ra) of 2 to 15 μm. has embossing surface was, b) the coefficient of static friction between the embossed surface is not less than 0.35 state, and are and dynamic friction coefficient of 0.3 or more, the embossed pattern in the embossed surface, a plurality of lines When the embossed surfaces of the packaging material are in contact with each other, the convex and concave surfaces of the embossed surfaces are engaged like a key. The object is achieved by providing an individual package of an absorbent article, wherein the relationship between the width a of the embossed convex portion and the width b of the concave portion is a ≦ b .
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, one preferable embodiment of the individual package of the absorbent article of the present invention will be described. The individual package of the absorbent article of the present embodiment is obtained by individually packaging sanitary napkins 2 as absorbent articles with a packaging material 3, and as shown in FIGS. 1 and 2, the absorbent article package 10. A plurality are stacked and stored.
[0006]
Thus, in the package 10 of the present embodiment, the outer surface 4 side of the packaging material 3 is subjected to a regular embossing process having a) an average surface roughness (Ra) of 2 to 15 μm, preferably 2 to 10 μm. B) The coefficient of static friction between the embossed surfaces is 0.35 or more, preferably 0.4 to 1.0, and the coefficient of dynamic friction is 0.3 or more, preferably 0.8. 35 to 0.8.
If the average surface roughness (Ra) is less than 2 μm, the effect that the target individual packages do not slip each other cannot be obtained. If the average surface roughness (Ra) exceeds 15 μm, the embossing is too deep and the embossing is transferred to the back surface of the packaging material. When performing the peeling process (a process for making it peelable), silicon is not uniformly applied.
When the static friction coefficient is less than 0.35 or the dynamic friction coefficient is less than 0.3, when three-dimensional napkins are packaged and aligned in multiple rows, they become slippery to each other, resulting in ball slipping and aligned packaging. It will disappear.
[0007]
Here, the average surface roughness (Ra), the static friction coefficient, and the dynamic friction coefficient are each measured as follows.
Method for measuring average surface roughness (Ra);
Although the measurement method is shown below, conditions not specifically shown below are measured according to JIS B 0601.
A sample of the packaging material is cut out in length × width = 70 mm × 20 mm and 20 mm × 70 mm, and fixed to a 76 mm × 26 mm microslide glass with a portion other than the measurement surface fixed with tape so as not to be wrinkled, and a measurement sample To do. About this measurement sample, a surface roughness meter (trade name “surfcom 300B” manufactured by Tokyo Seimitsu Co., Ltd.) measures a 5 μm needle, a scanning speed of 0.3 mm / sec, a load of 40 mmgf, a traverse length of 8 mm, and a cut off of 0.8 mm. Under conditions, the average surface roughness Ra is measured according to the usual measuring method of the apparatus.
The Ra of 10 points in total in the longitudinal direction (n = 5) and the lateral direction (n = 5) of the measurement sample was determined, and the average value was taken as the average surface roughness (Ra).
[0008]
Measuring method of static friction coefficient and dynamic friction coefficient;
Measurement methods are shown below, but measurement conditions not shown below are measured according to JIS K-7125.
A sample of the packaging material is cut out with a length × width = 100 mm × 100 mm to obtain a measurement sample.
Next, a machine with a handle attached to a stainless steel plate of 63 mm × 63 mm × thickness 7 mm (having a front and back of 63 mm × 63 mm, four sides of 63 mm × 7 mm, and a handle in the middle of one side A measurement slide piece is obtained by winding and fixing on a stainless steel jig) so that the measurement surface of the measurement sample (the embossed outer surface of the packaging material) becomes the front. Cover the entire rear surface of the measurement sample so that it does not sag or wrinkle, and make a hole to pass the handle (paste the film in the same direction as the handle), and tape the front. A slip piece is obtained by sticking using
Next, a sample of the packaging material was cut out in a length × width = 250 mm × 100 mm on a table (a stainless plate having a length of 500 mm × a width of 300 mm) to be slid by the friction coefficient measurement, and a measurement surface of the measurement sample (the embossing of the packaging material was performed Adhere the tape around the stainless steel plate so that there is no wrinkle so that the outer surface is on the front. (Make sure that the vertical direction of the measurement sample is the same as the vertical direction of the stainless steel plate)
The sliding measurement table was leveled, the back surface of the sliding piece was brought into contact, and a load was applied on the sliding piece so that the total load of the sliding piece and the weight was 1 kg. Measurement is performed under the conditions of min, a tensile distance of 60 mm, and a chart speed of 30 mm / min.
The static friction coefficient is obtained from the obtained chart according to a conventional method, and the dynamic friction coefficient is obtained from the average load after the movement has started. (As the friction coefficient, if the static friction force is 0.35 kg, the static friction coefficient is 0.35.)
The average value of a total of 10 points of the friction coefficient in the longitudinal direction of the sample attached to the slip measurement table and the sliding piece and 5 points in the lateral direction was obtained as a static friction coefficient and a dynamic friction coefficient.
[0009]
In this embodiment, the embossed surface 5 is formed on the entire outer surface 4 of the packaging material 3. Embossing pattern of the embossing surface 5, in order to make it difficult sliding in vertical and horizontal in either direction of the packaging material 3, Yes in a pattern of linear embossed crossed with each other, specifically, FIG. 4 ( The silk embossing pattern shown in a) and the diamond embossing pattern shown in FIG. 4B are preferred.
[0010]
The size of the embossed unevenness on the embossed surface 5 is preferably as follows in order to obtain a preferable static friction coefficient and dynamic friction coefficient.
It is preferable that the regular pitch c is 20 to 500 μm, the width a of the convex portion 5 a is 10 to 200 μm, and the width b of the concave portion 5 b is 10 to 300 μm. (Refer FIG. 4 about the convex part 5b, the pitch c, the width | variety a, and the width | variety b).
The reason why the regular pitch c is set to 20 μm or more, the width a is set to 10 μm or more, and the width b is set to 10 μm or more is to optimize the emboss pattern and obtain the above-mentioned friction coefficient. The reason why 200 μm or less and b is 300 μm or less is to increase the number of engaging each other and obtain the above-mentioned friction coefficient.
To particularly engaged as a key the convex and concave surfaces between the embossing surfaces 5 abutting each other, Aru the relationship between the width b of the width a and the concave portion 5b of the protruding portion 5a and the a ≦ b.
[0011]
It is preferable that the inner surface 6 in contact with the absorbent article of the packaging material 3 has an average surface roughness (Ra) of 0 to 3 μm from the viewpoint of uniformly applying a release agent such as silicone.
As described above, as a method of obtaining different surface roughnesses of Ra = 0-3 μm on the inner surface and Ra = 2-15 μm on the outer surface, the film itself was extruded with a different embossing process, in particular, a T-die or the like. Using the roll with the desired regular pattern embossing on the cooling roll and the receiving roll directly below, and the roll with the embossing with a small roughness Ra = 0 to 3 μm, the extruded film is passed between both rolls. The method obtained is most preferably used.
[0012]
Examples of the packaging material 3 of the present invention include polyethylene [linear low density polyethylene (L-LDPE), low density polyethylene (LDPE)], polypropylene, ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid copolymer. A film made of one kind of a blend (EA), a styrene-isoprene copolymer (SIS), a styrene-butadiene copolymer (SBS), an olefin elastomer, or a mixture thereof is used. Can be used as a body.
In the present invention, in order to improve the effect of the embossed surface, the material of the packaging material is a rubber material such as polyethylene, EVA, EA, SBS, olefinic elastomer having a density ρ = 0.92 or less. It is preferable to mix and use a low density resin having properties.
In the case of performing the peeling treatment, since the hot melt serving as a slip prevention material is directly applied to the peeling surface and transferred to the product, heat resistance is also required, and therefore the density ρ = 0.93 on the inner surface side. It is preferable to use a resin having heat resistance such as polyethylene and polypropylene.
That is, the material of the outer surface 4 of the packaging material 3 is preferably the low-density resin, the material of the inner surface 6 is preferably the high-density resin, and the packaging material is a laminated film having two or more layers having such a structure. Most preferably, the film is formed by extrusion molding.
[0013]
Since the packaging material 10 of the present embodiment configured as described above has the packaging material 3 configured as described above, the thickness of the central portion is particularly thicker than other portions as shown in FIGS. Absorbent article having a three-dimensional shape with a non-uniform thickness and an absorbent article (not shown) having a three-dimensional shape with a non-uniform thickness by arranging elastic members, that is, a non-uniform thickness It is suitable as a packaging material whose surface forms a non-planar shape.
And since it has the above-mentioned composition, when the packaging material is arranged, the convex surface and the concave surface on the embossed surface are fitted together like a key and are difficult to slide with each other. In conventional matte embossing and mat embossing, the convex and concave surfaces do not mesh with each other, and such an effect cannot be obtained. For this reason, it is excellent in the handleability at the time of arranging and packaging a plurality of individual packages, the productivity is good, and the cost can be reduced.
[0014]
The package of this embodiment is obtained by extruding to obtain a raw material film, and using the packaging material 3 obtained by performing an embossing treatment and, if necessary, a peeling treatment, an absorbent article according to a conventional method. It is obtained by individual packaging and stacking and storing the obtained individual packaging.
[0015]
【Example】
[Example 1 (individual film A)]
As a resin composition, a blend of L-LDPE 60 wt% with a density ρ = 0.935 and LDPE 40 wt% with a density ρ = 0.925 was used. The emboss was transferred between an embossed metal roll and a rubber roll as a receiving roll to obtain a polyethylene film having a basis weight of 25 g / m ² , on which one side was provided with regular grid-like embossing. A film obtained by applying silicon as a release agent to the rubber roll surface side of the obtained film and drying it, followed by release treatment (a film having the entire outer surface being an embossed surface and the entire inner surface being a release surface) This was designated as individual film A.
[0016]
[Example 2 (individual film B)]
An inner surface layer (basis weight 20 g / m ² ) having a resin composition of 70 wt% L-LDPE having a density ρ = 0.935 and 30 wt% LDPE having a density ρ = 0.925, and a density ρ = 0.915 An outer surface layer (basis weight 5 g / m ² ) of L-LDPE 70 wt% and LDPE 30 wt% with a density ρ = 0.925 made by using the metallocene catalyst was coextruded from the T die, and then the outer surface With the layer facing the grid embossing roll, the emboss is transferred between a rubber roll as a receiving roll, and a regular lattice embossing is applied to the outer surface layer to obtain a polyethylene film having a basis weight of 25 g / m ^2. It was. On the rubber roll surface side of the obtained film, silicon as a release agent was applied and dried, and a film subjected to a release treatment (a film with the entire outer surface being an embossed surface and the entire inner surface being a release surface) This was designated as individual film B.
[0017]
[Comparative Example 1 (Individual Film C)]
After extruding the same resin composition as in Example 1 from the T die in a single layer, the embossing was transferred between a satin embossing roll and a rubber roll as a receiving roll, and the basis weight on which the satin embossing was applied. A polyethylene film of 25 g / m ² was obtained. Silicone was applied as a release agent to the rubber roll surface side of the obtained film, dried, and a film subjected to a release treatment (a film having an embossed surface on the entire outer surface side and a release surface on the entire inner surface side) was obtained. This was designated as individual film C.
[0018]
[Comparative Example 2 (Individual packaging film D)]
After extruding the same resin composition as in Example 1 from the T-die in a single layer, the embossing was transferred between a coarser embossing roll coarser than Comparative Example 1 and a rubber roll as a receiving roll. A polyethylene film having a basis weight of 25 g / m ² was obtained. Silicone was applied as a release agent to the rubber roll surface side of the obtained film, dried, and a film subjected to a release treatment (a film having an embossed surface on the entire outer surface side and a release surface on the entire inner surface side) was obtained. This was designated as individual film D.
[0019]
With respect to the obtained individual films A to D, the average surface roughness (Ra) of the outer surface (silicon back surface) and silicon surface, and the static friction coefficient and the dynamic friction coefficient of the outer surfaces were measured, and the results are shown in [Table 1]. .
Moreover, in order to evaluate the workability of the obtained film, as shown in FIG. 5, a middle-high absorber (2a) is provided at the center of the napkin, the center is partially thick, and the thickness is uneven. As a packaging material for napkins, individual packages were obtained, and as shown in FIG. 1 and FIG. 2, 20 sheets were arranged side by side and tested for interior, and the results are shown in [Table 1].
[0020]
[Processability evaluation of individual film]
○: Even when 20 sheets were aligned and packed together, there was no slippage between individual packages and packaging was possible without any trouble.
X: When 20 sheets were aligned and packed together, the pieces in which the individual packages were slid and aligned collapsed and could not be packaged.
[0021]
[Table 1]

[0022]
【The invention's effect】
The individual packaging of the absorbent article of the present invention has good handling properties when the packaging of the absorbent article is aligned and packaged even if a plurality of individual packaging of the absorbent article is aligned and packaged. Contributes to cost reduction.
[Brief description of the drawings]
FIG. 1 is a partially cutaway perspective view of a package body containing a plurality of individual packages of absorbent articles according to the present invention.
2 is a cross-sectional view taken along the line ZZ in FIG. 1. FIG.
FIG. 3 is a perspective view of an individual package according to the present invention.
FIGS. 4 (a) and 4 (b) are partially enlarged views (enlarged view of portion X in FIG. 3) showing the main part of the packaging material of the absorbent article of the present invention.
FIG. 5 is a development view of the individual package shown in FIG. 3;
6 is a YY sectional view of the individual package shown in FIG. 3. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Individual package 2 Absorbent article 3 Packaging material 4 Outer surface 5 Embossed surface 6 Inner surface 10 Packaging

Claims

In individual packaging of absorbent articles individually wrapped with packaging materials,
The outer surface side of the packaging material has a) an embossed surface subjected to regular embossing with an average surface roughness (Ra) of 2 to 15 μm, and b) a coefficient of static friction between the embossed surfaces is 0. and at .35 or higher state, and are and dynamic friction coefficient of 0.3 or more,
The embossed pattern on the embossed surface is an embossed pattern in which a plurality of linear embosses intersect each other,
When the embossed surfaces of the packaging material are brought into contact with each other, the embossed surface widths of the embossed surfaces and the recessed surface b are such that the convex surfaces and the concave surfaces of the embossed surfaces are engaged like a key. An absorptive article of an absorbent article, wherein a ≦ b is satisfied.

The absorbent article according to claim 1, wherein the absorbent article has a non-uniform thickness and a non-planar surface.

The individual package of the absorbent article according to claim 1, wherein the inner surface of the packaging material in contact with the absorbent article has an average surface roughness (Ra) of 0 to 3 µm.