JP2005312700A - Humidity sensor sheet - Google Patents
Humidity sensor sheet Download PDFInfo
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- JP2005312700A JP2005312700A JP2004134745A JP2004134745A JP2005312700A JP 2005312700 A JP2005312700 A JP 2005312700A JP 2004134745 A JP2004134745 A JP 2004134745A JP 2004134745 A JP2004134745 A JP 2004134745A JP 2005312700 A JP2005312700 A JP 2005312700A
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- JP
- Japan
- Prior art keywords
- nonwoven fabric
- sheet
- wet
- light transmittance
- sensing sheet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- FWCDLNRNBHJDQB-UHFFFAOYSA-N [2-(hydroxymethyl)-3-octadecanoyloxy-2-(octadecanoyloxymethyl)propyl] octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(CO)(COC(=O)CCCCCCCCCCCCCCCCC)COC(=O)CCCCCCCCCCCCCCCCC FWCDLNRNBHJDQB-UHFFFAOYSA-N 0.000 description 1
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 1
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Landscapes
- Housing For Livestock And Birds (AREA)
- Absorbent Articles And Supports Therefor (AREA)
- Orthopedics, Nursing, And Contraception (AREA)
Abstract
Description
本発明は、濡れていることを直接触れることなく視認可能で、乳幼児用や介護用おむつ生地、尿取りパット、あるいはペット用シーツとして好適な、湿潤感知シートに関するものである。 The present invention relates to a wetness sensing sheet that can be visually recognized without being touched directly, and is suitable as a diaper fabric for infants and nursing care, a urine pad, or a pet sheet.
従来、乳幼児や介護用おむつの使用者の中には、おむつの濡れに対する不快感を表すことができない者もあり、介護人が定期的に着用者のおむつの中に手を差し入れて、おむつの濡れを確認していた。そのため、濡れていることを直接触れることなく、効率よく視認できる技術の提供が期待されている。 Traditionally, some users of infants and diapers for nursing care cannot express discomfort due to wetness of the diaper, and the caregiver regularly puts his hand in the diaper of the wearer, Wet was confirmed. Therefore, it is expected to provide a technology that allows efficient visual recognition without directly touching the wetness.
このようなおむつなどの濡れを感知するセンサーとしては、これまで電気的特性を利用したものや、化学的特性を利用するものなど種々提案されている。例えば、特許文献１などでは、一対の電極により、おむつの濡れを検知し、報知する方法が提案されている。また、特許文献２などでは、おむつ内のガスを外部へ導出して***の有無を検知する方法が提案されている。 As sensors for detecting the wetness of diapers and the like, various sensors have been proposed so far, such as sensors utilizing electrical characteristics and those utilizing chemical characteristics. For example, Patent Literature 1 proposes a method of detecting and notifying diaper wetting by a pair of electrodes. Moreover, in patent document 2 etc., the method of deriving the gas in a diaper outside and detecting the presence or absence of excretion is proposed.
しかるに、これら電気的特性を利用したものや化学的特性を利用した方法では、おむつ内部にセンサー等の異物を挿入する必要があるため、着用者が不快感や異物感を感じるという問題があった。 However, methods using these electrical characteristics or methods using chemical characteristics have the problem that the wearer feels discomfort or a foreign object because it is necessary to insert a foreign object such as a sensor inside the diaper. .
そこで、上記の特性等を使用することなく濡れを感知するセンサーとして、物理的特性、つまり、視覚的変化でおむつなどの濡れを感知する方法が提案されている。例えば、特許文献３などでは、吸水すると透明化する白色の微粒子を、樹脂バインダーとともに紙などの親水性基材に固着させた素材が開示されている。この基材の裏面に印刷を施しておけば、水に濡れた際、表面の白色微粒子と基材が透明化し、裏面の印刷が透けて見える。これは、白色微粒子の屈折率が水に近く、水に濡れることで微粒子表面での光の乱反射が減少し透明化するという物理的特性を利用している。 Therefore, as a sensor for sensing wetting without using the above-described characteristics, a method for sensing wetting of a diaper or the like by a physical characteristic, that is, a visual change has been proposed. For example, Patent Document 3 discloses a material in which white fine particles that become transparent upon water absorption are fixed to a hydrophilic substrate such as paper together with a resin binder. If printing is performed on the back surface of the base material, the white fine particles on the surface and the base material become transparent when wetted with water, and the printing on the back surface can be seen through. This utilizes the physical characteristics that the refractive index of white fine particles is close to that of water, and that the light is irregularly reflected on the surface of the fine particles and becomes transparent when wet.
しかしながら、基材として用いられることが多い紙は強度が低く、紙おむつなどの生産時に加わる応力などで破断することがあるために、その生産性を阻害する要因となる。また、製造コストが高いため、紙おむつの様な使い捨ての用途には好ましくない。さらに同上の理由などにより、表示面積を大きくできず、視認性に劣るという問題もある。 However, since paper often used as a base material has low strength and may break due to stress applied during production of a paper diaper or the like, it becomes a factor that hinders productivity. Moreover, since the manufacturing cost is high, it is not preferable for disposable uses such as disposable diapers. Further, for the same reason as described above, there is a problem that the display area cannot be increased and the visibility is poor.
そこで、本発明の課題は、湿潤により透明化し、裏面に施された着色が透けて見えるシートであって、より低コストで提供でき、高強度化された湿潤感知シートを提供することである。 SUMMARY OF THE INVENTION An object of the present invention is to provide a wet sensing sheet that is transparent by wetting and allows the coloring on the back surface to be seen through, which can be provided at a lower cost and has increased strength.
本発明者らは、鋭意検討した結果、親水剤を含有する熱可塑性樹脂の繊維からなり、特定の平均繊維径と嵩密度を有する不織布を用いて形成したシートに、その少なくとも一方の表面にシートとは異なる色または色相の着色を施すことにより、上記目標を達成し得ることを見出し、本発明に到達した。 As a result of intensive studies, the present inventors have made a sheet formed of a nonwoven fabric having a specific average fiber diameter and a bulk density on a surface of at least one surface thereof, which is made of a thermoplastic resin fiber containing a hydrophilic agent. The present inventors have found that the above-mentioned goal can be achieved by coloring with a color or hue different from that of the present invention.
すなわち、本発明の湿潤感知シートは、親水剤を含有する熱可塑性樹脂の繊維からなり、平均繊維径が１〜５０μｍ、嵩密度が０．００１〜０．４ｇ／ｃｍ３の不織布を用いて形成されるシートであって、少なくとも一方の表面にシートとは異なる色または色相の着色が施されたものである。 That is, the wetness sensing sheet of the present invention is formed using a nonwoven fabric composed of thermoplastic resin fibers containing a hydrophilic agent and having an average fiber diameter of 1 to 50 μm and a bulk density of 0.001 to 0.4 g / cm 3. In other words, at least one surface is colored with a color or hue different from that of the sheet.
上記シートに用いられる不織布は、メルトブロー不織布であることが好ましい。 The nonwoven fabric used for the sheet is preferably a melt blown nonwoven fabric.
さらに、上記シートが、メルトブロー不織布とスパンボンド不織布の積層不織布を用いて形成されるものであることは、本発明の好適な態様である。 Furthermore, it is a preferable aspect of the present invention that the sheet is formed using a laminated nonwoven fabric of a melt blown nonwoven fabric and a spunbond nonwoven fabric.
上記湿潤感知シートは、湿潤時の全光線透過率と非湿潤時の全光線透過率の差が１５％以上となるものであることが好ましい。 The wet sensing sheet is preferably such that the difference between the total light transmittance when wet and the total light transmittance when not wet is 15% or more.
本発明により、製造コストが廉価で、高強度の、濡れていることが直接触れることなく視認可能な湿潤感知シートが得られる。 According to the present invention, it is possible to obtain a wetness sensing sheet that is inexpensive to manufacture, has high strength, and is visible without being touched directly.
以下、本発明について詳細に説明する。 Hereinafter, the present invention will be described in detail.
本発明の湿潤感知シートは、親水剤を含有する熱可塑性樹脂の繊維からなり、特定範囲の繊維径と嵩密度を有する不織布を用いて形成されるシートであって、少なくとも一方の表面に該シートとは異なる色または色相の着色が施されたシートからなる。 The wetness sensing sheet of the present invention is a sheet made of a nonwoven fabric having a fiber diameter and a bulk density in a specific range, which is made of a thermoplastic resin fiber containing a hydrophilic agent, and is formed on at least one surface of the sheet. And a sheet colored with a different color or hue.
［熱可塑性樹脂］
本発明のシートに用いられる不織布の繊維の原料となる熱可塑性樹脂としては、ポリエステル樹脂、ポリアミド樹脂、ポリオレフィン樹脂などがあげられ、ポリエステル樹脂としては例えば、ポリエチレンテレフタレート、ポリブチレンテレフタレートなどがあり、ポリアミド樹脂としては例えば、ナイロン６、ナイロン６６などを用いることができる。これらのなかでは柔軟性に優れる点でポリオレフィン樹脂が好ましい。
[Thermoplastic resin]
Examples of the thermoplastic resin used as a raw material for the nonwoven fabric fibers used in the sheet of the present invention include polyester resins, polyamide resins, and polyolefin resins. Examples of polyester resins include polyethylene terephthalate and polybutylene terephthalate. For example, nylon 6, nylon 66, or the like can be used as the resin. Of these, polyolefin resins are preferred because of their excellent flexibility.
本発明に使用されるポリオレフィン樹脂としては、エチレン、プロピレン、ブテン、ペンテン、ヘキセン等のオレフィンや、酢酸ビニル等のビニルモノマーの重合体及びそれらの共重合体を主成分とするものが好ましく、具体的には低密度ポリエチレン、線型低密度ポリエチレン（エチレン−α−オレフィン共重合体）、中密度ポリエチレン、高密度ポリエチレン等のポリエチレン系樹脂、ポリプロピレン、エチレン−プロピレン共重合体等のポリプロピレン系樹脂、ポリ４−メチルペンテン、ポリブテン、エチレン−酢酸ビニル共重合体、エチレン−ブテン共重合体及びこれらの混合物が挙げられる。これらのポリオレフィン樹脂は、ツィーグラー触媒を用いて製造された樹脂であっても、また、メタロセン触媒の如きシングルサイト触媒を用いて製造された樹脂であってもよい。 The polyolefin resin used in the present invention is preferably an olefin such as ethylene, propylene, butene, pentene, hexene, or a polymer of vinyl monomers such as vinyl acetate and a copolymer thereof. Specifically, polyethylene resins such as low density polyethylene, linear low density polyethylene (ethylene-α-olefin copolymer), medium density polyethylene, and high density polyethylene, polypropylene resins such as polypropylene and ethylene-propylene copolymer, poly Examples include 4-methylpentene, polybutene, ethylene-vinyl acetate copolymer, ethylene-butene copolymer, and mixtures thereof. These polyolefin resins may be a resin produced using a Ziegler catalyst or a resin produced using a single site catalyst such as a metallocene catalyst.
これらの内、ポリプロピレン系樹脂がより好ましく、プロピレンの単独重合体、またはプロピレンを主モノマー成分とし、少なくとも一種の他のα―オレフィンとの共重合体がさらに好ましい。他のα―オレフィンとしては、エチレン、１−ブテン、１−ペンテン、１−ヘキセン、１−オクテン、４−メチル−１−ペンテン等の炭素数２〜２０、好ましくは炭素数２〜８のα―オレフィンを挙げることができる。これらのプロピレンの単独重合体または共重合体は、１種単独でもしくは２種以上を組み合わせても用いることができる。 Among these, a polypropylene resin is more preferable, and a homopolymer of propylene or a copolymer of propylene as a main monomer component and at least one other α-olefin is more preferable. Examples of other α-olefins include ethylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 4-methyl-1-pentene and the like having 2 to 20, preferably 2 to 8 carbon atoms. -Olefin can be mentioned. These homopolymers or copolymers of propylene can be used singly or in combination of two or more.
本発明において用いることのできるプロピレン系重合体は、不織布が製造可能なものであれば特に限定されないが、スパンボンド不織布製造の場合、メルトフローレート（以下、ＭＦＲと記す。）が通常１．５〜１０００ｇ／１０分、好ましくは１０〜１００ｇ／１０分、更に好ましくは３０〜８０ｇ／１０分のものであり、メルトブロー不織布製造の場合、ＭＦＲが通常３０ｇ〜１００００ｇ／１０分、好ましくは１００ｇ〜５０００ｇ／１０分で、更に好ましくは２００ｇ〜２０００ｇ／１０分のものである。ＭＦＲの測定は、各樹脂に応じて規格に基づいて測定され、例えばプロピレン系重合体では、ＡＳＴＭ Ｄ１２３８に基づいて、２３０℃、荷重２．１６ｋｇで測定されるものである。 The propylene-based polymer that can be used in the present invention is not particularly limited as long as it can produce a nonwoven fabric, but in the case of producing a spunbond nonwoven fabric, the melt flow rate (hereinafter referred to as MFR) is usually 1.5. -1000 g / 10 min, preferably 10-100 g / 10 min, more preferably 30-80 g / 10 min. In the case of melt blown nonwoven fabric production, the MFR is usually 30 g-10000 g / 10 min, preferably 100 g-5000 g. / 10 minutes, more preferably 200 g to 2000 g / 10 minutes. The measurement of MFR is measured based on the standard according to each resin. For example, in the case of a propylene-based polymer, it is measured at 230 ° C. and a load of 2.16 kg based on ASTM D1238.
プロピレン系重合体の重量平均分子量（Ｍｗ）と数平均分子量（Ｍｎ）の比Ｍｗ／Ｍｎは、通常１．５〜８．０である。スパンボンド不織布製造の場合、紡糸性が良好で、かつ繊維強度が特に優れる繊維が得られる点で、Ｍｗ／Ｍｎは１．５〜３．０が好ましい。本発明において、良好な紡糸性とは、紡糸ノズルからの吐出時および延伸中に糸切れを生じず、フィラメントの融着が生じないことをいう。Ｍｗ／Ｍｎは、ＧＰＣ（ゲルパーミエーションクロマトグラフィー）によって、通常の方法で測定されるものである。 The ratio Mw / Mn of the weight average molecular weight (Mw) and the number average molecular weight (Mn) of the propylene-based polymer is usually 1.5 to 8.0. In the case of producing a spunbonded nonwoven fabric, Mw / Mn is preferably 1.5 to 3.0 in that a fiber having good spinnability and particularly excellent fiber strength can be obtained. In the present invention, good spinnability means that yarn breakage does not occur during discharge from the spinning nozzle and during drawing, and filament fusion does not occur. Mw / Mn is measured by an ordinary method by GPC (gel permeation chromatography).
本発明で用いられる不織布の製造に使用する熱可塑性樹脂には、本発明の目的を損なわない範囲で必要に応じて他の成分を含有していてもよい。 The thermoplastic resin used for the production of the nonwoven fabric used in the present invention may contain other components as necessary within the range not impairing the object of the present invention.
他の成分としては、例えば他の機能を付与するために配合する添加剤などであり、用途に合わせて選択し、適宜配合することができる。具体例としては、従来公知の耐熱安定剤、耐候安定剤、各種安定剤、酸化防止剤、分散剤、帯電防止剤、スリップ剤、アンチブロッキング剤、防曇剤、滑剤、染料、顔料、天然油、合成油、ワックス、充填剤等が挙げられる。 Other components include, for example, additives that are blended for imparting other functions, and can be selected according to use and blended appropriately. Specific examples include conventionally known heat stabilizers, weather stabilizers, various stabilizers, antioxidants, dispersants, antistatic agents, slip agents, antiblocking agents, antifogging agents, lubricants, dyes, pigments, natural oils. , Synthetic oils, waxes, fillers and the like.
安定剤としては、例えば、２，６−ジ−ｔ−ブチル−４−メチルフェノール（ＢＨＴ）等の老化防止剤；テトラキス［メチレン−３−（３，５−ジ−ｔ−ブチル−４−ヒドロキシフェニル）プロピオネート］メタン、β−（３，５−ジ−ｔ−ブチル−４−ヒドロキシフェニル）プロピオン酸アルキルエステル、２，２’−オキザミドビス［エチル−３−（３，５−ジ−ｔ−ブチル−４−ヒドロキシフェニル）］プロピオネート、Ｉｒｇａｎｏｘ１０１０（商品名、ヒンダードフェノール系酸化防止剤）等のフェノール系酸化防止剤；ステアリン酸亜鉛、ステアリン酸カルシウム、１，２−ヒドロキシステアリン酸カルシウムなどの脂肪酸金属塩；グリセリンモノステアレート、グリセリンジステアレート、ペンタエリスリトールモノステアレート、ペンタエリスリトールジステアレート、ペンタエリスリトールトリステアレート等の多価アルコール脂肪酸エステルなどを挙げることができる。また、これらを組み合わせて用いることもできる。 Examples of the stabilizer include anti-aging agents such as 2,6-di-t-butyl-4-methylphenol (BHT); tetrakis [methylene-3- (3,5-di-t-butyl-4-hydroxy Phenyl) propionate] methane, β- (3,5-di-t-butyl-4-hydroxyphenyl) propionic acid alkyl ester, 2,2′-oxamide bis [ethyl-3- (3,5-di-t-butyl) -4-hydroxyphenyl)] propionate, phenolic antioxidants such as Irganox 1010 (trade name, hindered phenolic antioxidant); fatty acid metal salts such as zinc stearate, calcium stearate, calcium 1,2-hydroxystearate; Glycerol monostearate, glycerin distearate, pentaerythritol monostearate DOO, pentaerythritol distearate, and polyhydric alcohol fatty acid esters such as pentaerythritol tristearate and the like. Moreover, these can also be used in combination.
また、充填剤としては、シリカ、ケイ藻土、アルミナ、酸化チタン、酸化マグネシウム、軽石粉、軽石バルーン、水酸化アルミニウム、水酸化マグネシウム、塩基性炭酸マグネシウム、ドロマイト、硫酸カルシウム、チタン酸カリウム、硫酸バリウム、亜硫酸カルシウム、タルク、クレー、マイカ、アスベスト、ケイ酸カルシウム、モンモリロナイト、ベントナイト、グラファイト、アルミニウム粉、硫化モリブデン等の充填剤が挙げられる。 As fillers, silica, diatomaceous earth, alumina, titanium oxide, magnesium oxide, pumice powder, pumice balloon, aluminum hydroxide, magnesium hydroxide, basic magnesium carbonate, dolomite, calcium sulfate, potassium titanate, sulfuric acid Examples thereof include fillers such as barium, calcium sulfite, talc, clay, mica, asbestos, calcium silicate, montmorillonite, bentonite, graphite, aluminum powder, and molybdenum sulfide.
［親水剤］
本発明で使用する親水剤としては、マスターバッチ化可能な親水剤が好ましい。具体的には脂肪酸グリセライド、アルコキシ化アルキルフェノール、ポリオキシアルキレン脂肪酸エステル、アルキルポリオキシエチレンアルコール、脂肪酸アミド等の非イオン界面活性剤の群、脂肪酸塩、アルキル硫酸エステル塩、アルキルベンゼンスルホン酸塩、アルキルナフタレンスルホン酸塩、ジアルキルスルホコハク酸塩、特殊アニオン等の界面活性剤の群、ポリエチレングリコール、ビニルアルコールとエチレンとの共重合体、及びポリエーテルブロックアミド共重合体のような化合物の群から適宜に選択したものがあげられる。これらは単独であるいは混合物で用いることが出来る。これらのなかでは、その他のイオン性含有物の影響を受けにくい点で、非イオン界面活性剤が好ましい。
[Hydrophilic agent]
As the hydrophilic agent used in the present invention, a hydrophilic agent that can be masterbatched is preferable. Specifically, groups of nonionic surfactants such as fatty acid glycerides, alkoxylated alkylphenols, polyoxyalkylene fatty acid esters, alkylpolyoxyethylene alcohols, fatty acid amides, fatty acid salts, alkyl sulfate esters, alkylbenzene sulfonates, alkylnaphthalenes Appropriately selected from the group of surfactants such as sulfonates, dialkylsulfosuccinates, special anions, compounds such as polyethylene glycol, copolymers of vinyl alcohol and ethylene, and polyether block amide copolymers I can give you. These can be used alone or in a mixture. Among these, nonionic surfactants are preferable because they are not easily affected by other ionic substances.
なかでも以下の構造式を有するものが好ましい。
Ｒ１−（親水性オリゴマー）
上式中、Ｒ１は直鎖または分岐のアルキル基で、炭素数が２２から４０のものが好ましい。また親水性オリゴマーは、エチレンオキサイド、プロピレンオキサイド、エチレングリコール、エピクロロヒドリン、アクリル酸、メタクリル酸、エチレンイミン、カプロラクトン、ビニルアルコール、酢酸ビニル由来の単一またはオリゴマー単位からなり、その単位が２〜１０で構成されているものが好ましい。
Among these, those having the following structural formula are preferable.
R 1- (hydrophilic oligomer)
In the above formula, R 1 is a linear or branched alkyl group, preferably having 22 to 40 carbon atoms. The hydrophilic oligomer is composed of single or oligomer units derived from ethylene oxide, propylene oxide, ethylene glycol, epichlorohydrin, acrylic acid, methacrylic acid, ethyleneimine, caprolactone, vinyl alcohol, and vinyl acetate. What is comprised by 10 is preferable.
より好ましくは、以下の構造式を有するものがあげられる。
Ｒ１（ＯＣＨ２ＣＨ２）ｘＯＨ
上式中、ｘは２〜１０の数である。
More preferred are those having the following structural formula.
R 1 (OCH 2 CH 2 ) x OH
In the above formula, x is a number from 2 to 10.
更に具体的には、例えば、ＣＨ３ＣＨ２（ＣＨ２ＣＨ２）１３ＣＨ２ＣＨ２（ＯＣＨ２ＣＨ２）２．５ＯＨがあげられる。ここで、エチレンオキサイドの付加数２．５は平均的な値である。
これらの構造の化合物は、２種類以上混合して用いることが出来る。
More specifically, for example, CH 3 CH 2 (CH 2 CH 2 ) 13 CH 2 CH 2 (OCH 2 CH 2 ) 2.5 OH can be mentioned. Here, the addition number 2.5 of ethylene oxide is an average value.
Two or more kinds of compounds having these structures can be mixed and used.
［不織布］
本発明の湿潤感知シートは、熱可塑性樹脂の繊維からなる不織布を用いて形成される。この不織布はメルトブロー不織布であることが好ましい。
[Nonwoven fabric]
The wetness sensing sheet of the present invention is formed using a non-woven fabric made of thermoplastic resin fibers. This nonwoven fabric is preferably a melt blown nonwoven fabric.
メルトブロー不織布の製造方法は、親水剤を所定濃度となるように熱可塑性樹脂に加え溶融混練して作製した親水剤マスターバッチと、不織布の原料の熱可塑性樹脂とを所定割合で混合し、押出機等で溶融し、溶融物をメルトブロー紡糸口金から吐出して得られた繊維を、高温高速の気体によって極細繊維に牽引細化後、捕集装置により捕集して極細繊維ウェブとし、必要に応じてさらに熱融着処理することからなる。熱融着処理は熱エンボスロールによるのが好ましい。熱エンボスロールによる熱融着処理の場合、エンボスロールのエンボス面積率は、通常５〜３０％が好ましい。 A melt blown nonwoven fabric is manufactured by mixing a hydrophilic agent masterbatch prepared by melting and kneading a hydrophilic agent in a predetermined concentration with a thermoplastic resin and a thermoplastic resin as a raw material of the nonwoven fabric at a predetermined ratio, and an extruder. Etc., the fiber obtained by discharging the melt from the melt blown spinneret is drawn into ultrafine fibers by high-temperature and high-speed gas, and then collected by a collecting device to form an ultrafine fiber web. And further heat-sealing treatment. The heat fusion treatment is preferably performed by a hot embossing roll. In the case of heat fusion treatment with a hot embossing roll, the embossing area ratio of the embossing roll is usually preferably 5 to 30%.
不織布の平均繊維径は非湿潤時と湿潤時の光線透過率の差に影響を及ぼす。繊維径が大きすぎると、不織布繊維間の空隙が大きくなり、非湿潤時の光線透過率が高くなりすぎてこのましくない。また、繊維径が小さすぎると、不織布の比表面積が大きくなり、十分湿潤するために必要な液量が多くなる。そのため、湿潤時の光線透過率が高くなりにくく好ましくない。かかる観点から、不織布の平均繊維径は、１〜５０μｍが好ましい。さらに好ましくは１〜３０μｍである。 The average fiber diameter of the nonwoven fabric affects the difference in light transmittance between non-wetting and wet. If the fiber diameter is too large, the gaps between the non-woven fibers become large, and the light transmittance at the time of non-wetting becomes too high. On the other hand, if the fiber diameter is too small, the specific surface area of the nonwoven fabric increases and the amount of liquid necessary for sufficient wetting increases. For this reason, the light transmittance when wet is not easily increased. From this viewpoint, the average fiber diameter of the nonwoven fabric is preferably 1 to 50 μm. More preferably, it is 1-30 micrometers.
不織布の嵩密度も非湿潤時と湿潤時の光線透過率の差に影響を及ぼす。嵩密度が高くなりすぎると、不織布繊維間の空隙が狭くなり、湿潤時の光線透過率が低くなり好ましくない。また、嵩密度が低すぎると、不織布繊維間の空隙が大きくなりすぎて、非湿潤時の光線透過率が高くなり好ましくない。かかる観点から、不織布の嵩密度は、０．００１〜０．４ｇ／ｃｍ３が好ましい。さらに好ましくは０．０１〜０．４ｇ／ｃｍ３であり、０．０５〜０．３ｇ／ｃｍ３が最も好ましい。 The bulk density of the nonwoven fabric also affects the difference in light transmittance between non-wetting and wet. If the bulk density is too high, the gaps between the nonwoven fabric fibers are narrowed, and the light transmittance when wet is lowered, which is not preferable. On the other hand, if the bulk density is too low, the gap between the nonwoven fabric fibers becomes too large, and the light transmittance when not wet is increased, which is not preferable. From this viewpoint, the bulk density of the nonwoven fabric is preferably 0.001 to 0.4 g / cm 3 . More preferably, it is 0.01-0.4 g / cm < 3 >, and 0.05-0.3 g / cm < 3 > is the most preferable.
不織布にメルトブローン不織布を用いる場合には、適度な強度が得られる点で、目付量は３０ｇ／ｍ２以上であることが好ましく、光線透過率と経済性の点から３００ｇ／ｍ２以下であることが好ましく、さらには２００ｇ／ｍ２以下であることが好ましい。 When a melt blown nonwoven fabric is used as the nonwoven fabric, the basis weight is preferably 30 g / m 2 or more from the viewpoint of obtaining an appropriate strength, and is 300 g / m 2 or less from the viewpoint of light transmittance and economy. It is preferable that it is 200 g / m 2 or less.
本発明の湿潤感知シートは、また、メルトブロー不織布とスパンボンド不織布とを積層した積層不織布を用いて形成されることが好ましい。積層不織布であっても前記の平均繊維径と嵩密度の範囲にあることが好ましいが、本発明の目的を達成できるものであれば、前記の平均繊維径と嵩密度の範囲から外れる不織布が積層されていることを妨げるものではない。 The wetness sensing sheet of the present invention is preferably formed using a laminated nonwoven fabric obtained by laminating a melt blown nonwoven fabric and a spunbond nonwoven fabric. Even if it is a laminated nonwoven fabric, it is preferable that it is in the range of the average fiber diameter and the bulk density. It does not prevent you from being done.
スパンボンド不織布の製造は、例えば次のようになる。不織布の原料の樹脂組成物を、押出機等で溶融し、紡糸ノズルを有する紡糸口金から吐出させて、長繊維を紡出させる。そして紡出された長繊維を、冷却流体により冷却し、さらに延伸エアによって長繊維に張力を加えて所定の繊度とし、そのまま捕集ベルト上に捕集して所定の厚さに堆積させる。次いで、ニードルパンチ、ウオータージェット、超音波シール等の手段による交絡処理、あるいは熱エンボスロールによる熱融着処理等を行う。熱エンボスロールによる熱融着処理の場合、エンボスロールのエンボス面積率は、通常５〜３０％が好ましい。 For example, the production of the spunbond nonwoven fabric is as follows. The resin composition as a raw material for the nonwoven fabric is melted with an extruder or the like and discharged from a spinneret having a spinning nozzle to spin long fibers. Then, the spun long fibers are cooled with a cooling fluid, and further, tension is applied to the long fibers with drawn air to obtain a predetermined fineness, and the fibers are collected as they are on the collecting belt and deposited to a predetermined thickness. Next, entanglement processing by means such as needle punching, water jet, ultrasonic sealing, or heat fusion processing by a hot embossing roll is performed. In the case of heat fusion treatment with a hot embossing roll, the embossing area ratio of the embossing roll is usually preferably 5 to 30%.
スパンボンド不織布の繊維径は、本発明の湿潤感知シートが形成できるのであれば特に限定されないが、湿潤感知シートの光線透過率および強度を考慮すると、繊度として１〜１０ｄｔｅｘが好ましい。また、目付量は５〜３０ｇ／ｍ２が好ましく、さらには１０〜３０ｇ／ｍ２が好ましい。 The fiber diameter of the spunbonded nonwoven fabric is not particularly limited as long as the wetness sensing sheet of the present invention can be formed, but considering the light transmittance and strength of the wetness sensing sheet, the fineness is preferably 1 to 10 dtex. The basis weight is preferably 5 to 30 g / m 2 , and more preferably 10 to 30 g / m 2 .
メルトブロー不織布とスパンボンド不織布とを積層する方法には、例えば、スパンボンド不織布とメルトブロー不織布を重ね、熱エンボスロールによる熱融着処理等を行う方法、或いは、メルトブロー不織布の上に、所定の繊度にされた長繊維を直接堆積させ、次いで、ニードルパンチ、ウォータージェット、超音波シール等の手段による交絡処理、あるいは熱エンボスロールによる熱融着処理等を行う方法等が用いられる。 As a method of laminating a melt blown nonwoven fabric and a spunbond nonwoven fabric, for example, a method of stacking a spunbond nonwoven fabric and a melt blown nonwoven fabric and performing a heat-sealing treatment with a hot embossing roll, or a melt blown nonwoven fabric with a predetermined fineness A method of directly depositing the long fibers and then performing an entanglement process by means such as needle punching, water jet, ultrasonic sealing, or a heat fusion process using a hot emboss roll is used.
［着色］
本発明の湿潤感知シートは、上記の如くして製造されるシートの、少なくとも一方の表面に該シートとは異なる色もしくは色相の着色を施して製造される。着色の手段としては、本発明の目的が達成されるものであれば特に制限はないが、好ましくは着色による重量の増加が小さい印刷処理である。印刷は、フレキソ印刷やグラビア印刷など特に制限はなく、使用インキも油性、水性など制限はない。印刷柄にも特に制限はないが、ベタ印刷部は、その部分から湿潤感知シート内部の空孔に水が染み込みにくくなり、ウェット時の透明化に時間がかかる傾向にある。逆にドット印刷部は、比較的湿潤感知シート内部の空孔に水が染み込み易く、短時間で透明化する。用途に応じて、ベタ印刷部とドット印刷部を調整することが好ましい。また、用途に応じて両面印刷を施し、表面の印刷により非湿潤時の意匠性を向上させ、裏面の印刷により湿潤時の視認性を向上させるという機能差を付けることも可能である。
[Coloring]
The wetness sensing sheet of the present invention is produced by coloring at least one surface of the sheet produced as described above with a color or hue different from that of the sheet. The coloring means is not particularly limited as long as the object of the present invention can be achieved. However, it is preferably a printing process in which an increase in weight due to coloring is small. Printing is not particularly limited such as flexographic printing and gravure printing, and the ink used is not limited such as oiliness or water-based printing. Although there is no particular limitation on the print pattern, the solid print portion has a tendency that water does not easily permeate into the pores in the wetness sensing sheet from that portion, and it takes time to be transparent when wet. On the contrary, the dot printing portion is relatively easy to permeate water into the pores in the moisture sensing sheet and becomes transparent in a short time. It is preferable to adjust the solid print portion and the dot print portion according to the application. It is also possible to provide a functional difference in that double-sided printing is performed according to the application, and the design property when not wet is improved by printing on the front surface, and the visibility when wet is improved by printing on the back surface.
上記の如くして製造される本発明の湿潤感知シートは、非湿潤時の全光線透過率と湿潤時の全光線透過率の差が１５％以上となるものが好ましい。非湿潤時の全光線透過率と湿潤時の全光線透過率の差が１５％以上であれば、湿潤による視覚的な差異が知覚しやすく湿潤感知シートとして好ましい。より好ましくは、非湿潤時の全光線透過率と湿潤時の全光線透過率の差が２０％以上となるものである。 The wet sensing sheet of the present invention produced as described above preferably has a difference of 15% or more between the total light transmittance when not wet and the total light transmittance when wet. If the difference between the total light transmittance at the time of non-wetting and the total light transmittance at the time of wetting is 15% or more, a visual difference due to wetting is easily perceived, and it is preferable as a moisture sensing sheet. More preferably, the difference between the total light transmittance when not wet and the total light transmittance when wet is 20% or more.
本発明の湿潤感知シートの引張強度は１０Ｎ／２５ｍｍ以上とすることができ、適度な強度を有する。そのため、紙おむつなどの生産時に加わる応力などで破断することがなく、その生産性を阻害することがない。 The tensile strength of the wetness sensing sheet of the present invention can be 10 N / 25 mm or more, and has an appropriate strength. Therefore, it does not break due to stress applied during the production of paper diapers and the like, and the productivity is not hindered.
かかる特性を有する湿潤感知シートは、非湿潤時の全光線透過率が低く、湿潤時の全光線透過率が高く、また、強度が高く、廉価であるので、使い捨て紙おむつなどの尿インジケータ等として好適に使用できる。 The wet sensing sheet having such characteristics has low total light transmittance when not wet, high total light transmittance when wet, high strength, and low price, so it is suitable as a urine indicator for disposable disposable diapers, etc. Can be used for
本発明について更に具体的に説明するため、以下に実施例を示す。尚、本発明はこれらの実施例に限定されるものではない。 In order to describe the present invention more specifically, examples are shown below. The present invention is not limited to these examples.
実施例に示したＭＦＲ、平均繊維径、繊度、目付量、嵩密度、非湿潤時の全光線透過率、湿潤時の全光線透過率、引張強度及び親水剤の移行は、下記方法により測定または評価した値である。
（１）ＭＦＲ（ｇ／１０ｍｉｎ）
ＡＳＴＭ Ｄ−１２３８に規定される方法により、温度２３０℃、荷重２１６０ｇの条件下で測定する。
（２）平均繊維径（μｍ）
不織布試料の１００μｍ×８０μｍを３５０倍に拡大した電子顕微鏡写真を撮り、繊維径を任意に１０点測定した平均値で示す。
（３）繊度（ｄｔｅｘ）
ＪＩＳ Ｌ１０９６に準拠して測定する。
MFR, average fiber diameter, fineness, basis weight, bulk density, total light transmittance when not wet, total light transmittance when wet, tensile strength and migration of hydrophilic agent shown in the examples were measured by the following methods or It is the evaluated value.
(1) MFR (g / 10min)
Measured under conditions of a temperature of 230 ° C. and a load of 2160 g by the method defined in ASTM D-1238.
(2) Average fiber diameter (μm)
An electron micrograph of 100 μm × 80 μm of the nonwoven fabric sample magnified 350 times is taken, and the fiber diameter is shown as an average value measured at 10 points arbitrarily.
(3) Fineness (dtex)
Measured according to JIS L1096.
（４）目付量（ｇ／ｍ２）
不織布試料〔縦方向：１０ｃｍ、横方向：１０ｃｍ〕を１０枚採取し、質量計にて総量重を測定し、試料面積で除して各試料の目付量を算出し、これを１０枚で平均して目付量とする。
（５）嵩密度（ｇ／ｃｍ３）
嵩密度は、上記で求めた目付量を不織布厚みで割ることで求められる。不織布厚みは、不織布試料〔縦方向：１０ｃｍ、横方向：１０ｃｍ〕を１０枚採取し、各サンプル５箇所で合計５０箇所の測定点について、厚み測定機（ＰＥＡＣＯＣＫ社製、ＵＰＲＩＧＨＴ ＤＩＡＬ ＧＵＡＧＥ ＮＯ．２５）を用いて厚みを測定し、その平均厚みから求めることができる。
（６）非湿潤時の全光線透過率（％）
ＪＩＳ Ｋ７１０５に規定される方法に基づき、霞度計（日本電色工業製、型式：ＮＤＨ−３００Ａ）を用いて測定する。湿潤感知シートの機械方向（以下、縦方向という。）５０ｍｍ及び機械方向と直角方向（以下、横方向という。）１００ｍｍのサンプル１枚について２点測定し、合計１０枚２０点測定した平均値で示す。
(4) Weight per unit area (g / m 2 )
Ten nonwoven fabric samples (longitudinal direction: 10 cm, lateral direction: 10 cm) are collected, the total weight is measured with a mass meter, and the basis weight of each sample is calculated by dividing by the sample area. To the basis weight.
(5) Bulk density (g / cm 3 )
The bulk density is determined by dividing the basis weight determined above by the nonwoven fabric thickness. As for the thickness of the nonwoven fabric, 10 nonwoven fabric samples (longitudinal direction: 10 cm, lateral direction: 10 cm) were collected, and a thickness measuring machine (manufactured by PEACOCK, UPRIHT DIAL GUAGE NO. ) Is used to measure the thickness and can be determined from the average thickness.
(6) Total light transmittance when not wet (%)
Based on the method defined in JIS K7105, the measurement is performed using a colorimeter (manufactured by Nippon Denshoku Industries Co., Ltd., model: NDH-300A). Two points were measured for a sample of 50 mm in the machine direction (hereinafter referred to as the vertical direction) of the wetness sensing sheet and 100 mm in the direction perpendicular to the machine direction (hereinafter referred to as the horizontal direction). Show.
（７）湿潤時の全光線透過率（％）
上記と同様にサンプルを採取し、純水に湿潤感知シートを１分間浸した後、引き上げ、表面に残る水滴をティッシュペーパーで拭き取って、霞度計を用いて２点測定する。各サンプルについて上記の操作を繰り返し、合計１０枚２０点測定し、平均値で示す。
（８）引張強度（Ｎ／２５ｍｍ）
湿潤感知シートから縦方向試料〔縦方向：３００ｍｍ、横方向：２５ｍｍ〕を５枚と、横方向試料〔縦方向：２５ｍｍ、横方向：３００ｍｍ〕５枚を採取し、それぞれの試料について、ＪＩＳＬ１９０６ Ｌ に規定される方法により、チャック間２００ｍｍ、引張速度２００ｍ／ｍｉｎの条件下で測定する。
(7) Total light transmittance when wet (%)
A sample is collected in the same manner as described above, and the wet sensing sheet is soaked in pure water for 1 minute, then pulled up, water drops remaining on the surface are wiped off with a tissue paper, and two points are measured using a densitometer. The above operation is repeated for each sample, a total of 20 points are measured, and the average value is shown.
(8) Tensile strength (N / 25mm)
Five samples in the vertical direction (vertical direction: 300 mm, horizontal direction: 25 mm) and five samples in the horizontal direction (vertical direction: 25 mm, horizontal direction: 300 mm) were collected from the wetness sensing sheet, and each sample was JISL1906 L. Measured under the conditions of 200 mm between chucks and 200 m / min tensile speed.
（９）親水剤の移行
線形低密度ポリエチレン（三井化学（株）製、商品名：ウルトゼックス２０２１Ｌ）４０重量部に対し、炭酸カルシウム（同和カルファイン（株）製、商品名：ＳＳＴ−４０）６０重量部をタンブラーミキサーにて混合した後、タンデム型押出機を用いて２００℃において均一に混練してペレット状に加工し、このペレットをＴダイが装着された押出成形機を用いて、２４０℃において溶融製膜した後、７０℃に加熱した予熱ロールと延伸ロールとの間で４．０倍の延伸倍率で機械方向に一軸延伸してなる厚さ２５μｍの多孔性フィルム（２００ｍｍ角）、２００ｍｍ角の本発明の湿潤感知シート、１００ｍｍ角の濾紙２枚、をこの順番で重ね、インク色付けした水５ｍｌを濾紙上に滴下する。その後、濾紙上に１００ｍｍ角１０Ｋｇの重りを載せ、５分後に最底面（多孔性フィルム裏面）にインクが染み出しているか１００ｍｍ角内で目視観察し以下の評価基準で判断する。
○：染み出しなし、
×：染み出しあり。
(9) Transition of hydrophilic agent Calcium carbonate (manufactured by Dowa Calfine Co., Ltd., trade name: SST-40) with respect to 40 parts by weight of linear low density polyethylene (manufactured by Mitsui Chemical Co., Ltd., trade name: Ultzex 2021L) After mixing 60 parts by weight with a tumbler mixer, the mixture was uniformly kneaded at 200 ° C. using a tandem extruder and processed into a pellet, and the pellet was converted into 240 using an extruder equipped with a T die. A porous film (200 mm square) having a thickness of 25 μm formed by uniaxial stretching in the machine direction at a draw ratio of 4.0 times between a preheating roll heated to 70 ° C. and a drawing roll after melt film formation at 70 ° C., A 200 mm square wetness sensing sheet of the present invention and two 100 mm square filter papers are stacked in this order, and 5 ml of ink-colored water is dropped onto the filter paper. Thereafter, a 10 mm square weight of 100 mm square is placed on the filter paper, and after 5 minutes, whether or not the ink has oozed out to the bottom surface (back surface of the porous film) is visually observed within a 100 mm square and judged according to the following evaluation criteria.
○: No bleeding
×: Exudation.
［実施例１］
ポリプロピレン樹脂PP１（Basell社製 HF461X、ＭＦＲ：９００ｇ／１０ｍｉｎ）に、親水剤Ａ（Ｃｉｂａ社製 Ｉｒｇａｓｕｒｆ ＨＬ５６０）を樹脂１００重量部に対して３重量部となるように添加した樹脂組成物を押出機で溶融し、メルトブロー法により紡糸し、繊維径３μｍ、目付量５０ｇ／ｍ２のメルトブロー不織布を製造した。この不織布の片面に油性インクにより直径１ｍｍの青いドットを５ｍｍピッチで描いた千鳥格子模様をつけ、湿潤感知シートを得た。得られた湿潤感知シートの非湿潤時の全光線透過率、湿潤時の全光線透過率、目付量、引張強度、および親水剤の移行を上記方法により測定、評価した。得られた結果を表１に示す。
[Example 1]
Extruder is a resin composition in which a hydrophilic agent A (Irgasurf HL560, manufactured by Ciba) is added to polypropylene resin PP1 (Base461 HF461X, MFR: 900 g / 10 min) to 3 parts by weight with respect to 100 parts by weight of the resin. And melt-spun by a melt blow method to produce a melt blown nonwoven fabric having a fiber diameter of 3 μm and a basis weight of 50 g / m 2 . A staggered lattice pattern in which blue dots having a diameter of 1 mm were drawn at a pitch of 5 mm with an oil-based ink on one side of the nonwoven fabric was obtained to obtain a wet sensing sheet. The obtained wet sensing sheet was measured and evaluated by the above methods for the total light transmittance when not wet, the total light transmittance when wet, the basis weight, the tensile strength, and the migration of the hydrophilic agent. The obtained results are shown in Table 1.
［実施例２〜７、比較例１］
繊維径、目付量を表１、表２に示すように変更した以外、実施例１と同様にして湿潤感知シートを製造した。得られた湿潤感知シートの各特性を実施例１と同様にして測定、評価し、得られた結果を表１、表２に示す。
[Examples 2 to 7, Comparative Example 1]
A wetness sensing sheet was produced in the same manner as in Example 1 except that the fiber diameter and basis weight were changed as shown in Tables 1 and 2. Each characteristic of the obtained moisture sensing sheet was measured and evaluated in the same manner as in Example 1, and the obtained results are shown in Tables 1 and 2.
［比較例２］
ポリプロピレン樹脂ＰＰ２（三井化学(株)製 Ｓ１１９、ＭＦＲ：６０ｇ／１０ｍｉｎ）に、親水剤Ａ（Ｃｉｂａ社製 Ｉｒｇａｓｕｒｆ ＨＬ５６０）を樹脂１００重量部に対して３重量部となるように添加した樹脂組成物を押出機で溶融し、スパンボンド法により紡糸し、平均繊維径６０μｍ、目付５０ｇ／ｍ２のスパンボンド不織布を製造した。この不織布の片面に油性インクにより直径１ｍｍの青いドットを５ｍｍピッチで描いた千鳥格子模様をつけ、湿潤感知シートを得た。得られた湿潤感知シートの非湿潤時の全光線透過率、湿潤時の全光線透過率、目付量、引張強度、および親水剤の移行を上記方法により測定、評価した。得られた結果を表２に示す。
[Comparative Example 2]
Resin composition in which hydrophilic agent A (Irgasurf HL560, manufactured by Ciba) is added to polypropylene resin PP2 (S119, MFR: 60 g / 10 min, manufactured by Mitsui Chemicals Co., Ltd.) to 3 parts by weight with respect to 100 parts by weight of resin. It was melted in an extruder, spun by a spun bond method, an average fiber diameter of 60 [mu] m, to produce a spunbonded nonwoven fabric having a basis weight of 50 g / m 2. A staggered lattice pattern in which blue dots having a diameter of 1 mm were drawn at a pitch of 5 mm with an oil-based ink was applied to one side of the nonwoven fabric to obtain a wet sensing sheet. The obtained wet sensing sheet was measured and evaluated by the above methods for the total light transmittance when not wet, the total light transmittance when wet, the basis weight, the tensile strength, and the migration of the hydrophilic agent. The obtained results are shown in Table 2.
［実施例８］
ポリプロピレン樹脂ＰＰ２（三井化学(株)製 Ｓ１１９、ＭＦＲ：６０ｇ／１０ｍｉｎ）に、親水剤Ａ（Ｃｉｂａ社製 Ｉｒｇａｓｕｒｆ ＨＬ５６０）を樹脂１００重量部に対して３重量部となるように添加した樹脂組成物を押出機で溶融し、スパンボンド法により紡糸し、繊度２．９ｄｔｅｘ、目付２０ｇ／ｍ２のスパンボンド不織布を製造した。この不織布に、実施例１で得られたメルトブロー不織布をエンボス加工により熱融着し積層不織布を製造した。この積層不織布のメルトブロー不織布側に、油性インクにより直径１ｍｍの青いドットを５ｍｍピッチで描いた千鳥格子模様をつけ、湿潤感知シートを得た。得られた湿潤感知シートの非湿潤時の全光線透過率、湿潤時の全光線透過率、目付量、引張強度、および親水剤の移行を上記方法により測定、評価した。得られた結果を表３に示す。
[Example 8]
Resin composition obtained by adding hydrophilic agent A (Irgasurf HL560, manufactured by Ciba) to polypropylene resin PP2 (S119, MFR: 60 g / 10 min, manufactured by Mitsui Chemicals Co., Ltd.) in an amount of 3 parts by weight with respect to 100 parts by weight of the resin. It was melted in an extruder, spun by a spun bond method, fineness 2.9Dtex, to produce a spunbonded nonwoven fabric having a basis weight of 20 g / m 2. The melt blown nonwoven fabric obtained in Example 1 was heat-sealed to this nonwoven fabric by embossing to produce a laminated nonwoven fabric. A staggered lattice pattern in which blue dots having a diameter of 1 mm were drawn at a pitch of 5 mm with oil-based ink was applied to the melt-blown nonwoven fabric side of the laminated nonwoven fabric to obtain a wet sensing sheet. The obtained wet sensing sheet was measured and evaluated by the above methods for the total light transmittance when not wet, the total light transmittance when wet, the basis weight, the tensile strength, and the migration of the hydrophilic agent. The obtained results are shown in Table 3.
［実施例９〜１４、比較例３〜６］
スパンボンド不織布の親水剤の配合割合、繊度、目付量および積層不織布の着色面を表３、表４に示すように変更した以外、実施例８と同様にして湿潤感知シートを製造した。得られた湿潤感知シートの各特性を実施例１と同様にして測定、評価し、得られた結果を表３、表４に示す。
[Examples 9 to 14, Comparative Examples 3 to 6]
A wetness sensing sheet was produced in the same manner as in Example 8 except that the blending ratio, fineness, basis weight, and colored surface of the laminated nonwoven fabric of the spunbond nonwoven fabric were changed as shown in Tables 3 and 4. Each characteristic of the obtained moisture sensing sheet was measured and evaluated in the same manner as in Example 1, and the obtained results are shown in Tables 3 and 4.
従来のものに比べ強度が向上しており、しかも、より廉価で従来と同等の湿潤状態の表示機能を持つものである。そのため、衛生材料、医療用材料、衣料用材料、建築用材料、包装材料等の分野において好適に使用することができる。特に、使い捨てオムツ等の吸収体物品の尿インジケータとして好適に使用することができる。 The strength is improved compared to the conventional one, and it is cheaper and has a display function in a wet state equivalent to the conventional one. Therefore, it can be suitably used in the fields of sanitary materials, medical materials, clothing materials, building materials, packaging materials, and the like. In particular, it can be suitably used as a urine indicator for absorbent articles such as disposable diapers.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009074895A1 (en) * | 2007-12-13 | 2009-06-18 | Kimberly-Clark Worldwide, Inc. | Cosmetic wipe that provides a visual indication of its effectiveness |
| WO2018031932A1 (en) * | 2016-08-12 | 2018-02-15 | Gui Global Products, Ltd. | Moisture detecting article and method of making same |
| JP2018048971A (en) * | 2016-09-23 | 2018-03-29 | 積水化学工業株式会社 | Water detection sheet |
| JP2021040752A (en) * | 2019-09-06 | 2021-03-18 | ユニチカ株式会社 | Surface material of sanitary material and manufacturing method thereof |
-
2004
- 2004-04-28 JP JP2004134745A patent/JP4166724B2/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009074895A1 (en) * | 2007-12-13 | 2009-06-18 | Kimberly-Clark Worldwide, Inc. | Cosmetic wipe that provides a visual indication of its effectiveness |
| WO2018031932A1 (en) * | 2016-08-12 | 2018-02-15 | Gui Global Products, Ltd. | Moisture detecting article and method of making same |
| JP2018048971A (en) * | 2016-09-23 | 2018-03-29 | 積水化学工業株式会社 | Water detection sheet |
| JP2021040752A (en) * | 2019-09-06 | 2021-03-18 | ユニチカ株式会社 | Surface material of sanitary material and manufacturing method thereof |
| JP7411950B2 (en) | 2019-09-06 | 2024-01-12 | ユニチカ株式会社 | Surface material for sanitary materials and its manufacturing method |
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