JP6208549B2 - Nonwoven fabric using cellulose fiber - Google Patents
Nonwoven fabric using cellulose fiber Download PDFInfo
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本発明は、意匠性が良好で、湿潤時に縒れにくく、フェイスマスクに加工した場合、着用時の取扱い性や密着感に優れる不織布、特に化粧用不織布に関する。 The present invention relates to a non-woven fabric, particularly a cosmetic non-woven fabric, which has good design properties, is difficult to squeeze when wet, and is excellent in handleability and adhesion when worn into a face mask.
従来、セルロース繊維不織布は美容向けのフェイスマスクとして広く使用されている。例えば、銅アンモニアレーヨン原液を流下緊張法によりウエブ化し、ウエブ化時に繊維が自己接着し、その後、高圧水流処理で3次元交絡を行って不織布化した再生セルロース連続長繊維不織布は、湿潤時の形態安定性が良好で、肌触りに優れている(例えば下記特許文献1参照)。
また、ストライプ模様を有する不織布において、良好な意匠性と強度特性を兼ね備えた、コットン、パルプ、レーヨン等のセルロース繊維不織布が開発されている(例えば下記特許文献2参照)。
Conventionally, a cellulose fiber nonwoven fabric has been widely used as a face mask for beauty. For example, a regenerated cellulose continuous long-fiber nonwoven fabric in which a copper ammonia rayon stock solution is made into a web by the falling tension method, the fibers self-adhere at the time of the web formation, and then made into a nonwoven fabric by three-dimensional entanglement by high-pressure water flow treatment, The stability is good and the touch is excellent (for example, see Patent Document 1 below).
In addition, a cellulose fiber nonwoven fabric such as cotton, pulp, rayon, etc. has been developed that has a good design and strength characteristics in a nonwoven fabric having a stripe pattern (see, for example, Patent Document 2 below).
しかしながら、近年需要が拡大してきた、美容向けのフェイスマスク専用不織布の開発は十分でなく、以下のような問題点があった。
(1)薄い不織布は、一般的に異方性が高く、フェイスマスク着用時の取り扱い性や形態安定性が良くない。
(2)取り扱い性の良い不織布は、目付や布厚みが増し、薄さ、透明性及び柔軟性を維持できない。
(3)バインダー等の不純物が入っている事が多く、肌への刺激性を否定できない。
(4)再生セルロース繊維は、一般的に湿潤強力が低下し、伸度が増大するため、寸法安定性が悪くなりやすい。
(5)従来のセルロース繊維及びポリエステルなど合繊を複合した不織布は、強度が高く、取扱い性は改善されるが、密着感や保液性等のフェイスマスクに重要な機能が低下する。
However, the development of face mask non-woven fabrics for beauty use, which has been increasing in recent years, has not been sufficiently developed and has the following problems.
(1) A thin nonwoven fabric generally has high anisotropy and is not good in handleability and form stability when a face mask is worn.
(2) A nonwoven fabric with good handleability has increased basis weight and fabric thickness, and cannot maintain thinness, transparency and flexibility.
(3) There are many impurities such as binders, and skin irritation cannot be denied.
(4) Regenerated cellulose fibers generally have low wet strength and increase elongation, so that dimensional stability tends to deteriorate.
(5) Conventional nonwoven fabrics combined with synthetic fibers such as cellulose fibers and polyester have high strength and improved handleability, but the functions important for face masks such as adhesion and liquid retention are reduced.
本発明が解決しようとする課題は、上記問題点を解決し、意匠性が高く、薄くても、湿潤時に縒れにくく、フェイスマスクに加工した場合、着用時の取扱い性や密着感に優れる不織布を提供することである。 The problem to be solved by the present invention is to solve the above-mentioned problems, high in design, thin and difficult to squeeze when wet, and when processed into a face mask, the nonwoven fabric has excellent handling and adhesion when worn. Is to provide.
本発明者は、上記課題を解決するために、鋭意研究を重ねた結果、セルロース繊維不織布の未交絡部と交絡部の比率(未交絡比率)が特定範囲にあり、且つ、交絡部と未交絡部が不織布の一方向に沿って複数列存在し、蛇行しており、未交絡部が交絡部に囲まれた独立した空間を持つ場合に、意匠性が良好で、薄くても湿潤時に縒れにくく、フェイスマスクに加工した場合に、着用時の取扱い性や密着感に優れる事を見出し、本発明を完成するに至った。
すなわち、本発明は以下の構成を有している。
As a result of intensive studies in order to solve the above problems, the present inventor found that the ratio of the unentangled part to the entangled part (unentangled ratio) of the cellulose fiber nonwoven fabric is in a specific range, and the entangled part and the unentangled part There are multiple rows of parts along one direction of the nonwoven fabric, meandering, and the unentangled part has an independent space surrounded by the entangled part. It was difficult, and when it was processed into a face mask, it was found that it was excellent in handling and adhesion when worn, and the present invention was completed.
That is, the present invention has the following configuration.
(1)セルロース繊維からなる交絡部と未交絡部をもつ不織布であって、下記(A)および(B):
(A)交絡部は不織布の一方向に沿って複数列存在し、蛇行しており、未交絡部は交絡部に囲まれた独立した空間を持つ;
(B)未交絡部の不織布全体に対する面積比率は20%以上70%以下である;
の特徴を有する不織布。
(2)未交絡部の並ぶ方向kが、不織布の伸長性を有する方向(不織布の幅方向:CD方向)と直角する方向(不織布の長さ方向:MD方向)と並行でない、上記(1)に記載の不織布。
(3)不織布の伸長性を有する方向(不織布の幅方向:CD方向)において、湿潤状態で、50gf/cmの一定荷重をかけた時の伸度が10%以上50%以下である、上記(1)または(2)に記載の不織布。
(4)不織布の伸長性を有する方向(不織布の幅方向:CD方向)において、湿潤状態のヤング率が5mPa以上50mPa以下である、上記(1)〜(3)のいずれかに記載の不織布。
(5)不織布の目付が20g/m2以上60g/m2以下である、上記(1)〜(4)のいずれかに記載の不織布。
(6)上記(1)〜(5)のいずれかに記載の不織布を含むフェイスマスク。
(1) A non-woven fabric having an entangled part and an unentangled part made of cellulose fiber, and the following (A) and (B) :
(A) The entangled part is present in a plurality of rows along one direction of the nonwoven fabric, meandering, and the unentangled part has an independent space surrounded by the entangled part ;
(B) The area ratio of the unentangled part to the whole nonwoven fabric is 20% or more and 70 % or less ;
A nonwoven fabric having the following characteristics.
(2) The above-mentioned (1) , wherein the direction k in which the unentangled portions are arranged is not parallel to the direction (non-woven fabric length direction: MD direction) perpendicular to the direction in which the nonwoven fabric has extensibility (non-woven fabric width direction: CD direction ). The nonwoven fabric described in 1.
(3) a direction having a stretchable nonwoven fabric (width direction of the nonwoven fabric: CD direction) in a humidified state, elongation of 50% or less than 10% when applying a constant load of 50 gf / cm, The nonwoven fabric as described in said (1) or (2).
(4) non-woven (the width direction of the nonwoven fabric: CD direction) direction having a stretchable fabric in the Young's modulus of the wet state is less 50mPa least 5 mPa, the above (1) to any crab described (3) Non-woven fabric.
(5) basis weight of the nonwoven fabric is 20 g / m 2 or more 60 g / m 2 or less, the (1) to (4) non-woven fabric of any crab described.
(6) A face mask comprising the nonwoven fabric according to any one of (1) to (5) above.
本発明の不織布は、意匠性が良好で、薄くても湿潤時に縒れにくく、フェイスマスクに加工した場合に、着用時の取扱い性や密着感に優れている。 The nonwoven fabric of the present invention has good design properties, and even when it is thin, it is difficult to squeeze when wet, and when processed into a face mask, it is excellent in handleability and adhesion when worn.
以下、本願発明について具体的に説明する。
本発明の不織布を構成するセルロース繊維としては、銅アンモニアレーヨン、ビスコースレーヨン、テンセル(リヨセル)およびポリノジック等の再生セルロース繊維、コットン、パルプ、麻等の天然セルロース繊維が用いられ、好ましくは再生セルロース繊維である。この繊維は連続長繊維でも短繊維でも構わないが、連続長繊維は、短繊維のものよりも、よりリントフリー性に優れ、吸液性にも優れている。また、バインダーや界面活性剤を付与したセルロース繊維不織布では、吸水性の低下や、成分の溶出が懸念されるため、ノーバインダーのセルロース繊維不織布であることが好ましい。
Hereinafter, the present invention will be specifically described.
As the cellulose fiber constituting the nonwoven fabric of the present invention, regenerated cellulose fibers such as copper ammonia rayon, viscose rayon, tencel (lyocell) and polynosic, and natural cellulose fibers such as cotton, pulp and hemp are used, preferably regenerated cellulose. Fiber. This fiber may be either a continuous long fiber or a short fiber. However, the continuous long fiber is more excellent in lint-free property and liquid absorption than that of the short fiber. Moreover, in the cellulose fiber nonwoven fabric which provided the binder and surfactant, since a water absorption fall and elution of a component are anxious about a cellulose fiber nonwoven fabric of a binder, it is preferable.
本発明で用いられるセルロース繊維の繊維径は、4μm以上12μm以下であることが好ましい。より好ましくは4μm以上10μm以下であり、更に好ましくは4μm以上6μm以下である。4μm未満の場合、繊維組織が緻密になり過ぎて、湿潤時の伸度が低下し、剛くなり過ぎて、例えば、フェイスマスクに加工した場合、装着時の肌への追従性が低下してしまう。一方で、12μmより大きい場合、繊維組織が粗大となり、湿潤時の伸度が過剰となり、取扱いが悪くなる。 The fiber diameter of the cellulose fiber used in the present invention is preferably 4 μm or more and 12 μm or less. More preferably, they are 4 micrometers or more and 10 micrometers or less, More preferably, they are 4 micrometers or more and 6 micrometers or less. When the thickness is less than 4 μm, the fiber structure becomes too dense, the elongation at the time of wetness decreases, and becomes too stiff, for example, when processed into a face mask, the followability to the skin at the time of wearing decreases. End up. On the other hand, when larger than 12 micrometers, a fiber structure will become coarse, the elongation at the time of wetness will become excess, and handling will worsen.
本発明のセルロース繊維不織布の目付は、20g/m2以上60g/m2以下であることが好ましい。より好ましくは25g/m2以上55g/m2以下であり、更に好ましくは30g/m2以上50g/m2以下である。セルロース繊維不織布の目付が20g/m2未満の場合、薄すぎる為に取扱い性が著しく低下し、実用的でない。一方で、目付が60g/m2より大きい場合、取扱い性は優れるが、布厚み及び剛性が増し、肌の動きに追随せず、例えば着用感などのフェイスマスク性能そのものが悪くなる。 The basis weight of the cellulose fiber nonwoven fabric of the present invention is preferably 20 g / m 2 or more and 60 g / m 2 or less. More preferably 25 g / m 2 or more 55 g / m 2 or less, further preferably 30 g / m 2 or more 50 g / m 2 or less. When the basis weight of the cellulose fiber nonwoven fabric is less than 20 g / m 2 , the handleability is remarkably deteriorated because it is too thin, and is not practical. On the other hand, when the basis weight is larger than 60 g / m 2 , the handleability is excellent, but the cloth thickness and rigidity increase, and the movement of the skin does not follow, and the face mask performance itself such as a feeling of wear is deteriorated.
本発明のセルロース繊維不織布の厚みは0.20mm以上0.50mm以下であることが好ましい。より好ましくは0.25mm以上0.50mm以下であり、更に好ましくは0.25mm以上0.35mm以下である。セルロース繊維不織布の厚みが0.20mm未満の場合、薄すぎるために取扱い性が著しく低下する。0.50mmより大きい場合、取り扱い性は優れるが、湿潤時の強度が増し、フェイスマスク着用感が低下する。 The thickness of the cellulose fiber nonwoven fabric of the present invention is preferably 0.20 mm or more and 0.50 mm or less. More preferably, they are 0.25 mm or more and 0.50 mm or less, More preferably, they are 0.25 mm or more and 0.35 mm or less. When the thickness of the cellulose fiber nonwoven fabric is less than 0.20 mm, the handleability is remarkably lowered because it is too thin. When it is larger than 0.50 mm, the handleability is excellent, but the strength when wet is increased and the feeling of wearing the face mask is lowered.
本発明のセルロース繊維不織布の密度は0.25g/m3以下であることが好ましい。より好ましくは0.20g/m3以下である。セルロース繊維不織布の密度が0.25より大きい場合、湿潤時の密着感などフェイスマスク着用感が低下する。また、本発明のセルロース繊維不織布の密度は低い方が好ましいが、現実的には0.15g/m3以上が好ましい。 The density of the cellulose fiber nonwoven fabric of the present invention is preferably 0.25 g / m 3 or less. More preferably, it is 0.20 g / m 3 or less. When the density of the cellulose fiber nonwoven fabric is larger than 0.25, the feeling of wearing a face mask such as a feeling of adhesion when wet is lowered. Further, the density of the cellulose fiber nonwoven fabric of the present invention is preferably low, but practically it is preferably 0.15 g / m 3 or more.
本発明のセルロース繊維不織布の未交絡部の不織布全体に対する面積比率は、20%以上80%以下であることが好ましい。より好ましくは40%以上80%以下であり、更に好ましくは40%以上70%以下である。セルロース繊維不織布の未交絡部の面積比率が20%未満の場合、湿潤時の伸度が高く、取扱い性が著しく低下する。80%より大きい場合、取り扱い性は優れるが、湿潤時の強度が過剰となり、例えば、フェイスマスクに加工した場合、装着時の肌への追従性が悪く、フェイスマスクの着用感が低下する。 It is preferable that the area ratio with respect to the whole nonwoven fabric of the unentangled part of the cellulose fiber nonwoven fabric of this invention is 20% or more and 80% or less. More preferably, they are 40% or more and 80% or less, More preferably, they are 40% or more and 70% or less. When the area ratio of the unentangled portion of the cellulose fiber nonwoven fabric is less than 20%, the elongation when wet is high, and the handleability is significantly reduced. If it is greater than 80%, the handleability is excellent, but the strength when wet becomes excessive. For example, when it is processed into a face mask, the followability to the skin at the time of wearing is poor, and the feeling of wearing the face mask decreases.
また、不織布の交絡部は、不織布の一方向に沿って複数列存在し、蛇行しており、相互に複数の交点を有し、未交絡部は交絡部に囲まれた独立した空間を持つ事を特徴とする。一連の未交絡部が並ぶ方向は、不織布繊維の伸長性を有する方向(不織布の幅方向:CD方向)と直角する方向(不織布の長さ方向(機械方向):MD方向)に対して並行でなく、交絡部がバイアス方向に波型曲線を描きながら、未交絡部分を残すことで、不織布繊維の伸長性を有する方向の強度を高く保つ事が可能となる。 In addition, the entangled portions of the nonwoven fabric exist in multiple rows along one direction of the nonwoven fabric, meander, have a plurality of intersections with each other, and the unentangled portion has an independent space surrounded by the entangled portions. It is characterized by. The direction in which a series of unentangled portions are arranged in parallel to the direction (non-woven fabric length direction (machine direction): MD direction) perpendicular to the direction in which the non-woven fiber has extensibility (non-woven fabric width direction: CD direction). However, by leaving the unentangled part while the entangled part draws a wave curve in the bias direction, it is possible to keep the strength of the nonwoven fabric fiber in the direction having the extensibility.
一方、未交絡部が無い通常の不織布では、伸び過ぎて取扱い性が悪い。未交絡部分が交絡部分に囲まれて独立して存在する事で、伸び過ぎず取扱い性に優れる。また、例えば、上記特許文献2に記載のストライプ模様を有する不織布は、交絡部及び未交絡部が相互に離間し、平行でかつ連続したストライプ状である為、湿潤時の特に不織布繊維の伸長性を有する方向の引張り強度が弱い。 On the other hand, a normal nonwoven fabric having no unentangled portion is too stretched and has poor handleability. The unentangled part is surrounded by the entangled part and exists independently, so that it does not grow too much and is excellent in handleability. In addition, for example, the nonwoven fabric having a stripe pattern described in Patent Document 2 has an entangled portion and an unentangled portion separated from each other and parallel and continuous stripes. The tensile strength in the direction of having is weak.
図1は本発明の不織布の水流交絡パターンの平面図の一例である。図中2が交絡部であり、複数列存在し、不織布の機械方向(MD方向)に対して蛇行しており、隣接する交絡部同士が交点4で交差している。従って、未交絡部3は交絡部2によって囲まれた独立空間となっている。そして、一連の未交絡部3が並んでいる方向kは不織布の機械方向(MD方向:長さ方向)と並行していない。未交絡部3は不織布の機械方向と並行ではない一定方向に並んでいるので、本発明の不織布は優れた意匠性を有する。しかし、未交絡部の面積比率が20%未満になると、未交絡部は、後述するようにマイクロスコープを用いた画像解析では確認できるが、肉眼では独立した空間と確認できず、意匠性も劣る。 FIG. 1 is an example of a plan view of the hydroentanglement pattern of the nonwoven fabric of the present invention. In the figure, reference numeral 2 denotes an entangled portion, which is present in a plurality of rows, meanders with respect to the machine direction (MD direction) of the nonwoven fabric, and adjacent entangled portions intersect at an intersection 4. Therefore, the unentangled part 3 is an independent space surrounded by the entangled part 2. And the direction k in which a series of unentangled parts 3 are lined up is not parallel to the machine direction (MD direction: length direction) of the nonwoven fabric. Since the unentangled portions 3 are arranged in a certain direction that is not parallel to the machine direction of the nonwoven fabric, the nonwoven fabric of the present invention has excellent design properties. However, when the area ratio of the unentangled portion is less than 20%, the unentangled portion can be confirmed by image analysis using a microscope as described later, but cannot be confirmed as an independent space by the naked eye, and the design property is also inferior. .
本発明の不織布の交絡の方法は公知の交絡方法が何ら制限なく用いられ、特に限定されないが、水流交絡が好ましく、例えば柱状流が好適に用いられる。柱状流ノズルが一列の場合、交絡部分と未交絡部分は互いに離間しながら一定の間隔で不織布が形作られるため、本発明の不織布を作ることはできない。
本発明の不織布をつくるためには複数列のノズルが必要である。列が多すぎると未交絡部分が殆ど無くなってしまい、列が少ないと未交絡部の比率は高くなるが、ノズル詰まりを起こした時の影響が大きくなる。一方、ノズルピッチも重要な要素であり、ノズルピッチが広すぎると未交絡部分が多くなり過ぎ、狭すぎると未交絡部分が殆ど無くなってしまう。本発明では、ノズルピッチとノズル列の数を適切に設定する必要がある。例えば、MD方向には8.0mm〜15.0mmピッチ、CD方向には2.0mm〜4.0mmピッチ、ノズルの列は2列〜4列等に設定する。図1において、1がノズルヘッダーであり、各ノズルヘッダーは2本のノズル列5および6から構成されている。ノズル列5および6の間隔がMD方向のノズルピッチであり、各ノズル列にはCD方向に一定ピッチでノズル孔7が設けられている。各ノズルヘッダーは交絡部2を蛇行させるために、機械方向(MD方向)と直角方向(CD方向)に往復運動している。
The entanglement method of the nonwoven fabric of the present invention can be any known entanglement method without any limitation, and is not particularly limited, but hydroentanglement is preferable, for example, columnar flow is preferably used. When the columnar flow nozzles are arranged in a row, the nonwoven fabric of the present invention cannot be produced because the nonwoven fabric is formed at a constant interval while the entangled portion and the unentangled portion are separated from each other.
Multiple rows of nozzles are required to make the nonwoven fabric of the present invention. If there are too many rows, there will be almost no unentangled part, and if there are few rows, the ratio of unentangled portions will be high, but the effect when nozzle clogging will increase. On the other hand, the nozzle pitch is also an important factor. If the nozzle pitch is too wide, there will be too many unentangled parts, and if it is too narrow, there will be almost no unentangled parts. In the present invention, it is necessary to appropriately set the nozzle pitch and the number of nozzle rows. For example, the pitch is set to 8.0 mm to 15.0 mm in the MD direction, 2.0 mm to 4.0 mm pitch in the CD direction, and the nozzle rows are set to 2 rows to 4 rows. In FIG. 1, 1 is a nozzle header, and each nozzle header is composed of two nozzle rows 5 and 6. The interval between the nozzle rows 5 and 6 is the nozzle pitch in the MD direction, and nozzle holes 7 are provided in each nozzle row at a constant pitch in the CD direction. Each nozzle header reciprocates in the machine direction (MD direction) and the perpendicular direction (CD direction) to meander the entangled portion 2.
本発明のセルロース繊維不織布の50gf/cm一定荷重時の伸度は、不織布の伸長性を有する方向において、湿潤状態で、10%以上50%以下であることが好ましい。より好ましくは10%以上40%以下であり、更に好ましくは10%以上35%以下である。セルロース繊維不織布の伸度が10%未満の場合、取り扱い性は優れるが、例えば、フェイスマスクに加工した場合、装着時に剛く、肌への追従性が悪い為、フェイスマスクの着用感が低下する。50%より大きい場合、湿潤時の伸度が高く、かつ、交絡が不十分で解れ易い。 The elongation at a constant load of 50 gf / cm of the cellulose fiber nonwoven fabric of the present invention is preferably 10% or more and 50% or less in a wet state in the direction in which the nonwoven fabric has extensibility. More preferably, they are 10% or more and 40% or less, More preferably, they are 10% or more and 35% or less. When the elongation of the cellulose fiber nonwoven fabric is less than 10%, the handleability is excellent. However, when processed into a face mask, for example, it is stiff at the time of wearing and has poor followability to the skin, so the feeling of wearing the face mask decreases. . When it is larger than 50%, the elongation at the time of wetting is high, and the confounding is insufficient and easy to unravel.
本発明のセルロース繊維不織布のヤング率は、湿潤状態で、不織布の伸長性を有する方向において、5mPa以上50mPa以下であることが好ましい。より好ましくは10mPa以上40mPa以下であり、更に好ましくは10mPa以上30mPa以下である。セルロース繊維不織布のヤング率が5mPa未満の場合、湿潤時の伸度が高く、取扱い性が著しく低下する。50mPaより大きい場合、取り扱い性は優れるが、湿潤強度が過剰となり、例えば、フェイスマスクに加工した場合、装着時の肌への追従性が悪く、フェイスマスクの着用感が低下する。 The Young's modulus of the cellulose fiber nonwoven fabric of the present invention is preferably 5 mPa or more and 50 mPa or less in a wet state in the direction in which the nonwoven fabric has extensibility. More preferably, it is 10 mPa or more and 40 mPa or less, More preferably, it is 10 mPa or more and 30 mPa or less. When the Young's modulus of the cellulose fiber non-woven fabric is less than 5 mPa, the elongation at the time of wetness is high, and the handleability is remarkably lowered. When it is larger than 50 mPa, the handleability is excellent, but the wet strength becomes excessive. For example, when processed into a face mask, the followability to the skin at the time of wearing is poor, and the feeling of wearing the face mask is lowered.
本発明において化粧用不織布とは、化粧用フェイスマスク用不織布シート及び制汗用不織布シート、ウエットティッシュ、メイク落とし等のWET拭き取りシートなど、化粧用バルクやアルコール含浸用基材として用いられている不織布を言う。 In the present invention, the cosmetic non-woven fabric is a non-woven fabric used as a base material for cosmetic bulk or alcohol impregnation, such as a non-woven fabric sheet for a cosmetic face mask, a non-woven fabric sheet for antiperspirant, a wet tissue, a wet wipe sheet such as a makeup remover, etc. Say.
以下、本発明を実施例により更に詳細に説明するが、本発明はこれらの実施例のみに限定されるものではない。本発明における測定方法を以下に示す。
(1)繊維径(μm)
セルロース繊維不織布を、走査型電子顕微鏡、日本電子製JSM−6380を用いて10000倍の倍率で観察し、任意の50本を選び繊維径を測定し、平均値を求めた。
(2)目付(g/m2)
0.05m2以上の面積のセルロース繊維不織布を、105℃で一定重量になるまで乾燥後、20℃、65%RHの恒温室に16時間以上放置してその重量を測定し、不織布のm2当たりの重量(g)を求めた。
EXAMPLES Hereinafter, although an Example demonstrates this invention still in detail, this invention is not limited only to these Examples. The measurement method in the present invention is shown below.
(1) Fiber diameter (μm)
The cellulose fiber nonwoven fabric was observed at a magnification of 10,000 times using a scanning electron microscope and JSM-6380 manufactured by JEOL, and 50 fibers were selected and the fiber diameter was measured to obtain an average value.
(2) Weight per unit (g / m 2 )
The 0.05 m 2 or more of the area of the cellulosic fibrous nonwoven fabric, after drying to constant weight at 105 ° C., 20 ° C., allowed to stand in a thermostatic chamber of RH 65% 16 hours or more and the weight thereof was measured, the nonwoven m 2 The weight per gram (g) was determined.
(3)厚み(mm)
セルロース繊維不織布を、JIS−L1096準拠の厚み試験にて荷重を1.96kPaとして測定した。
(4)密度(g/cm3)
セルロース繊維不織布の厚みと目付をそれぞれ10回測定し、その平均値となる厚み(mm)Aと目付B(g/m2)を用いて次式により密度を算出した。
密度 = ( B / A ) / 1000
(3) Thickness (mm)
The cellulose fiber nonwoven fabric was measured with a load of 1.96 kPa in a thickness test in accordance with JIS-L1096.
(4) Density (g / cm 3 )
The thickness and basis weight of the cellulose fiber nonwoven fabric were measured 10 times, and the density was calculated by the following formula using the average thickness (mm) A and basis weight B (g / m 2 ).
Density = (B / A) / 1000
(5)未交絡部の不織布全体に対する面積比率(%)
マイクロスコープ(10倍)を用いた画像解析より、未交絡部が50点入るような不織布面積A(mm2)において、未交絡部の合計面積B(mm2)を測定し、全体の面積A(mm2)とから、次式により未交絡部の面積比率を求めた。
未交絡部の面積比率=( B / A ) ×100
(5) Area ratio of unentangled part to the whole nonwoven fabric (%)
From the image analysis using a microscope (10 times), the total area B (mm 2 ) of the unentangled portion was measured in the nonwoven fabric area A (mm 2 ) where 50 points of unentangled portions were included. From (mm 2 ), the area ratio of the unentangled part was determined by the following formula.
Area ratio of unentangled part = (B / A) × 100
(6)50gf/cm一定荷重下での伸度(%)
カトーテック株式会社製のKES-FB1引張り試験機を用いて評価した。20cm×20cmの試験片を蒸留水に浸漬させて、1分後、液垂れがしない程度に軽く絞り、引張り試験機にて、不織布の伸長性を有する方向において、荷重50gf/cm下での伸度を3回測定し、平均して求めた。
(6) Elongation under constant load of 50 gf / cm (%)
Evaluation was performed using a KES-FB1 tensile tester manufactured by Kato Tech Co., Ltd. A test piece of 20 cm × 20 cm is immersed in distilled water, and after 1 minute, it is lightly drawn to such an extent that it does not drip, and is stretched under a load of 50 gf / cm in a direction having the stretchability of the nonwoven fabric by a tensile tester. The degree was measured three times and obtained by averaging.
(7)ヤング率(mPa)
JIS L 1096に準拠して、幅5cm、長さ15cmの試験片を把握長10cmとなる様に把持し、定速伸長型引張り試験機(商品名:テンシロンUCT−1t(オリエンテック株式会社製))を用いて不織布の伸長性を有する方向に、引っ張り速度が30cm±3cm/minの条件で伸長させ、試料が破断するときのヤング率を測定した。
(7) Young's modulus (mPa)
In accordance with JIS L 1096, a test piece having a width of 5 cm and a length of 15 cm is gripped so as to have a grasping length of 10 cm, and a constant speed extension type tensile tester (trade name: Tensilon UCT-1t (manufactured by Orientec Co., Ltd.) ) Was used to stretch the nonwoven fabric in the direction having the extensibility of the nonwoven fabric under the condition that the tensile speed was 30 cm ± 3 cm / min, and the Young's modulus when the sample broke was measured.
(8)着用感
被験者20人でフェイスマスク着用感の官能評価を行った。評価方法および判定基準は以下のとおりであり、20人の平均値をそのサンプルの肌触りの官能評価の値とした。
評価方法:各素材の試験用不織布をフェイスマスク型にカットし、ドライ状態で4つ折にしたフェイスマスク型のサンプルを純水を用いて、各素材毎の吸水倍率量を含浸させる。1分間放置後、フェイスマスク型サンプルを展開して、顔に装着する。この際、取り扱い性・密着性・柔軟性等を評価する。装着後、5分間放置状態で、鏡越しに見て密着感の程度を評価する。
判定基準:国立大学法人 信州大学大学院と旭化成せんい株式会社の共同研究結果より得られた、官能検査 SD法(−3点以上+3点以下)に準拠して、下記表1記載の判定基準に従って評価した。
(8) Wearing feeling Twenty test subjects performed sensory evaluation of wearing feeling of face mask. The evaluation method and the judgment criteria are as follows, and the average value of 20 people was used as the sensory evaluation value of the touch of the sample.
Evaluation method: The test nonwoven fabric of each material is cut into a face mask type, and a face mask type sample that has been folded into four in a dry state is impregnated with pure water to impregnate the amount of water absorption for each material. After leaving for 1 minute, the face mask type sample is developed and attached to the face. At this time, handleability, adhesion, flexibility and the like are evaluated. Evaluate the degree of adhesion by looking through a mirror in a state of standing for 5 minutes after installation.
Judgment criteria: Evaluated according to the judgment criteria described in Table 1 below based on the sensory test SD method (-3 points + 3 points) obtained from the joint research results of Shinshu University Graduate School and Asahi Kasei Fibers Corporation. did.
(実施例1)
コットンリンター(重合度900〜1000)を銅アンモニア溶液で溶解し(コットンリンター10wt%、アンモニア7wt%、銅3wt%)紡糸原液を準備した。原液吐出孔が直径0.6mm、45個/cm2である紡糸口金を用い1ホール当たりの吐出量が0.09cc/minにて、流下緊張下で連続してネット上に5層重ねで紡糸してセルロース連続長繊維ウエブを得た。得られたセルロース連続長繊維ウエブを希硫酸で再生し、水洗後得られた再生セルロース連続長繊維ウエブを40メッシュのコンベアーネット(支持体)上で、列数が2列、列の間隔が8mm、CD方向に4mmピッチの柱状流ノズル孔を有する3本のノズルヘッダー(ノズルヘッダー間隔は100mm)を用いて、3mPaの高圧水流で水流交絡処理を行い、シートを交絡させた後、100℃の熱風乾燥を行い、水流交絡部と未交絡部が表面に形成された再生セルロース連続長繊維不織布を得た。なお、ノズルヘッダーをウエブの進行方向と直角に往復運動させることにより、交絡部を蛇行させた。
Example 1
Cotton linter (degree of polymerization 900-1000) was dissolved with a copper ammonia solution (cotton linter 10 wt%, ammonia 7 wt%, copper 3 wt%) to prepare a spinning dope. Using a spinneret with a stock solution discharge hole diameter of 0.6 mm and 45 pieces / cm 2 , the discharge rate per hole is 0.09 cc / min. Thus, a cellulose continuous long fiber web was obtained. The obtained cellulose continuous long fiber web was regenerated with dilute sulfuric acid, and the regenerated cellulose continuous long fiber web obtained after washing with water on a 40-mesh conveyor net (support) had two rows and a row spacing of 8 mm. Then, using three nozzle headers (nozzle header spacing is 100 mm) having columnar flow nozzle holes with a pitch of 4 mm in the CD direction, hydroentanglement treatment was performed with a high-pressure water flow of 3 mPa, and the sheet was entangled. Drying with hot air was performed to obtain a regenerated cellulose continuous long fiber nonwoven fabric having hydroentangled portions and unentangled portions formed on the surface. The entangled portion was meandered by reciprocating the nozzle header at right angles to the web traveling direction.
得られた再生セルロース連続長繊維不織布は、目付が40.0g/m2、厚みが0.25mmであり、未交絡部の不織布全体に対する面積比率が49.3%であった。得られた不織布の平面図を図1に、特性及び機能性の評価結果を表2および表3に示す。表2および表3からも判る通り、得られた再生セルロース連続長繊維不織布は、フェイスマスクに加工した場合の装着時の扱い易さ、及び肌との密着感が良好で、化粧用の各種用途に使用する不織布として、極めて良好な不織布であった。 The obtained regenerated cellulose continuous long-fiber nonwoven fabric had a basis weight of 40.0 g / m 2 , a thickness of 0.25 mm, and an area ratio of the unentangled portion to the entire nonwoven fabric was 49.3%. The top view of the obtained nonwoven fabric is shown in FIG. 1, and the evaluation results of characteristics and functionality are shown in Tables 2 and 3. As can be seen from Table 2 and Table 3, the obtained regenerated cellulose continuous long fiber non-woven fabric is easy to handle at the time of wearing when processed into a face mask and has good adhesion to the skin, and various uses for cosmetics. As the nonwoven fabric used for the above, it was a very good nonwoven fabric.
(実施例2)
再生セルロース繊維不織布(レーヨン100%繊維)を用いて、実施例1と同様の条件で、40メッシュのコンベアーネット(支持体)上で、列数が2列、列の間隔が8mm、CD方向に4mmピッチの柱状流ノズル孔を有する3本のノズルヘッダー(ノズルヘッダー間隔は100mm)を用いて、3mPaの高圧水流で水流交絡処理を行い、シートを交絡させた後、100℃の熱風乾燥を行った。
得られた再生セルロース連続長繊維不織布は、目付が38.4g/m2、厚みが0.27mm、未交絡部の不織布全体に対する面積比率が53.2%であった。特性及び機能性の評価結果を表2および表3に示す。表2および表3からも判る通り、得られた再生セルロース繊維不織布は、フェイスマスクに加工した場合の装着時の扱い易さ、及び肌との密着感が良好で、化粧用の各種用途に使用する不織布として極めて良好な不織布であった。
(Example 2)
Using recycled cellulose fiber nonwoven fabric (100% rayon fiber), on the 40 mesh conveyor net (support) under the same conditions as in Example 1, the number of rows is 2, the spacing between rows is 8 mm, in the CD direction. Using three nozzle headers (nozzle header spacing is 100 mm) with 4 mm pitch columnar flow nozzle holes, hydroentanglement treatment is performed with a high pressure water flow of 3 mPa, and the sheet is entangled, followed by hot air drying at 100 ° C. It was.
The obtained regenerated cellulose continuous long-fiber nonwoven fabric had a basis weight of 38.4 g / m 2 , a thickness of 0.27 mm, and an area ratio of the unentangled portion to the entire nonwoven fabric of 53.2%. The evaluation results of characteristics and functionality are shown in Table 2 and Table 3. As can be seen from Table 2 and Table 3, the obtained regenerated cellulose fiber nonwoven fabric is easy to handle at the time of wearing when processed into a face mask and has good adhesion to the skin, and is used for various cosmetic applications. It was a very good nonwoven fabric.
(実施例3)
原液吐出孔が直径0.3mm、180個/cm2である紡糸口金を用い、1ホール当たりの吐出量が0.02cc/min、交絡処理における列の間隔が15mmとしたこと以外は実施例1と同様の条件にて、5層構造の再生セルロース連続長繊維不織布を得た。得られた再生セルロース連続長繊維不織布は、目付が29.6g/m2、厚みが0.28mmであり、未交絡部の不織布全体に対する面積比率が61.6%であった。特性及び機能性の評価結果を表2および表3に示す。表2および表3からも判る通り、得られた再生セルロース連続長繊維不織布は、フェイスマスクに加工した場合の装着時の扱い易さ、及び肌との密着感が良好で、化粧用の各種用途に使用する不織布として、極めて良好な不織布であった。
(Example 3)
Example 1 except that a spinneret having a stock solution discharge hole diameter of 0.3 mm and 180 pieces / cm 2 was used, the discharge amount per hole was 0.02 cc / min, and the interval between rows in the entanglement process was 15 mm. Under the same conditions, a regenerated cellulose continuous long fiber nonwoven fabric having a five-layer structure was obtained. The obtained regenerated cellulose continuous long-fiber nonwoven fabric had a basis weight of 29.6 g / m 2 , a thickness of 0.28 mm, and an area ratio of the unentangled portion to the entire nonwoven fabric was 61.6%. The evaluation results of characteristics and functionality are shown in Table 2 and Table 3. As can be seen from Table 2 and Table 3, the obtained regenerated cellulose continuous long fiber non-woven fabric is easy to handle at the time of wearing when processed into a face mask and has good adhesion to the skin, and various uses for cosmetics. As the nonwoven fabric used for the above, it was a very good nonwoven fabric.
(比較例1)
実施例1において、紡糸口金のホール数を1300個/cm2、交絡処理における列数を7列、列の間隔を0.4mm、CD方向のノズル孔のピッチを2.5mm、孔径を0.15mmにしたこと以外は、実施例1と同様の条件にて、5層構造の再生セルロース連続長繊維不織布を得た。得られた再生セルロース連続長繊維不織布は、目付が40.0g/m2、厚みが0.30mmであり、未交絡部の不織布全体に対する面積比率が19.0%であった。得られた不織布の平面図を図1に、特性及び機能性の評価結果を表2および表3に示す。表2および表3からも判る通り、得られた再生セルロース連続長繊維不織布は、湿潤時の伸度が高く、取扱い性が著しく低下し、フェイスマスクに加工した場合の装着時の着用感が劣り、本発明の不織布に比べ、各種の用途に使用するには、問題のあるものであった。また、肉眼では未交絡部が独立した空間と確認できず、意匠性にも劣るものであった。
(Comparative Example 1)
In Example 1, the number of holes in the spinneret is 1300 / cm 2 , the number of rows in the entanglement process is 7 rows, the row spacing is 0.4 mm, the nozzle hole pitch in the CD direction is 2.5 mm, and the hole diameter is 0. A regenerated cellulose continuous long-fiber nonwoven fabric having a five-layer structure was obtained under the same conditions as in Example 1 except that the thickness was 15 mm. The obtained regenerated cellulose continuous long-fiber nonwoven fabric had a basis weight of 40.0 g / m 2 , a thickness of 0.30 mm, and an area ratio of the unentangled portion to the entire nonwoven fabric was 19.0%. The top view of the obtained nonwoven fabric is shown in FIG. 1, and the evaluation results of characteristics and functionality are shown in Tables 2 and 3. As can be seen from Tables 2 and 3, the obtained regenerated cellulose continuous long-fiber nonwoven fabric has high elongation when wet, remarkably lower handleability, and poor wearing feeling when worn into a face mask. Compared to the nonwoven fabric of the present invention, there are problems in using it for various purposes. In addition, with the naked eye, the unentangled part could not be confirmed as an independent space, and the design was inferior.
(比較例2)
市販のセルロース繊維不織布(三和紙業製、リヨセル/パルプ複合繊維)を用いて、比較例1と同様の交絡処理を行なった。得られたセルロース繊維不織布の目付は34.5g/m2、厚みは0.38mm、未交絡部の不織布全体に対する面積比率は19.9%であった。特性及び機能性の評価結果を表2および表3に示す。
(Comparative Example 2)
Using the commercially available cellulose fiber nonwoven fabric (manufactured by Sanwa Paper Industry Co., Ltd., lyocell / pulp composite fiber), the same entanglement treatment as in Comparative Example 1 was performed. The basis weight of the obtained cellulose fiber nonwoven fabric was 34.5 g / m 2 , the thickness was 0.38 mm, and the area ratio of the unentangled portion to the whole nonwoven fabric was 19.9%. The evaluation results of characteristics and functionality are shown in Table 2 and Table 3.
(比較例3)
上記特許文献2の実施例2の記載に準じて、セルロース及び合繊複合不織布(ダイワボウホールディングス株式会社製、パルプ/ポリエステル複合繊維)を用いて、構成繊維が交絡された繊維ウエブの一部が交絡により再配列され、相互に離間したストライプの幅が5mmであるスパンレース不織布を得た。得られた不織布の目付は40.2g/m2、厚みは0.39mm、未交絡部の不織布全体に対する面積比率は82.3%であった。特性及び機能性の評価結果を表2および表3に示す。
(Comparative Example 3)
In accordance with the description in Example 2 of Patent Document 2, a part of the fiber web in which the constituent fibers are entangled with cellulose and synthetic fiber composite nonwoven fabric (manufactured by Daiwabo Holdings Co., Ltd., pulp / polyester composite fiber) is entangled. A spunlace nonwoven fabric was obtained which was rearranged and the width of the stripes spaced apart from each other was 5 mm. The basis weight of the obtained nonwoven fabric was 40.2 g / m 2 , the thickness was 0.39 mm, and the area ratio of the unentangled portion to the whole nonwoven fabric was 82.3%. The evaluation results of characteristics and functionality are shown in Table 2 and Table 3.
本発明の不織布は化粧用フェイスマスク用不織布シート及び制汗用不織布シート、アルコールウエットティッシュ、メイク落とし等のWET拭き取りシートなど、化粧用バルクやアルコール含浸用基材としてコスメ分野に好適に用いられる。 The nonwoven fabric of the present invention is suitably used in the cosmetics field as a cosmetic bulk or base material for alcohol impregnation, such as a non-woven fabric sheet for a cosmetic face mask, a non-woven fabric sheet for antiperspirant, an alcohol wet tissue, a wet wipe sheet such as makeup remover.
1 ノズルヘッダー
2 交絡部
3 未交絡部
4 交点
5 ノズル列
6 ノズル列
7 ノズル孔
DESCRIPTION OF SYMBOLS 1 Nozzle header 2 Interlaced part 3 Unentangled part 4 Intersection point 5 Nozzle row 6 Nozzle row 7 Nozzle hole
Claims (6)
(A)交絡部は不織布の一方向に沿って複数列存在し、蛇行しており、未交絡部は交絡部に囲まれた独立した空間を持つ;
(B)未交絡部の不織布全体に対する面積比率は20%以上70%以下である;
の特徴を有する不織布。 A non-woven fabric having an entangled portion and an unentangled portion made of cellulose fiber, and the following (A) and (B) :
(A) The entangled part is present in a plurality of rows along one direction of the nonwoven fabric, meandering, and the unentangled part has an independent space surrounded by the entangled part ;
(B) The area ratio of the unentangled part to the whole nonwoven fabric is 20% or more and 70 % or less ;
A nonwoven fabric having the following characteristics.
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JPH09241958A (en) * | 1995-12-27 | 1997-09-16 | Kasen Nozuru Seisakusho:Kk | Production of entangled fiber sheet by water-jet, apparatus therefor and water-jet nozzle of the apparatus |
JP3836445B2 (en) * | 2002-07-18 | 2006-10-25 | 憲司 中村 | Easy-to-use face mask |
JP4471620B2 (en) * | 2003-10-16 | 2010-06-02 | 旭化成せんい株式会社 | Cellulose fiber nonwoven fabric and nonwoven fabric product using the same |
JP4873836B2 (en) * | 2004-03-03 | 2012-02-08 | 旭化成せんい株式会社 | Cosmetic base material and skin cleaning sheet using the same |
JP3998683B2 (en) * | 2004-12-28 | 2007-10-31 | 花王株式会社 | Cleaning sheet |
JP4869784B2 (en) * | 2006-05-24 | 2012-02-08 | ユニチカ株式会社 | Method for producing cellulosic nonwoven fabric |
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