JPH11128825A - Production of water absorptive sheet - Google Patents
Production of water absorptive sheetInfo
- Publication number
- JPH11128825A JPH11128825A JP9312912A JP31291297A JPH11128825A JP H11128825 A JPH11128825 A JP H11128825A JP 9312912 A JP9312912 A JP 9312912A JP 31291297 A JP31291297 A JP 31291297A JP H11128825 A JPH11128825 A JP H11128825A
- Authority
- JP
- Japan
- Prior art keywords
- water
- sheet
- coating
- absorbent
- absorbent 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.)
- Granted
Links
Landscapes
- Absorbent Articles And Supports Therefor (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Paints Or Removers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する分野】本発明は、紙おむつ、生理用品、
衣料用、建材用、食品包装用その他に使用される吸水シ
ートに関する。The present invention relates to disposable diapers, sanitary products,
The present invention relates to a water-absorbing sheet used for clothing, building materials, food packaging and the like.
【０００２】[0002]
【従来の技術】現在市販されている使い捨て紙おむつ、
生理用ナプキン等の吸収体として、そのほとんどが綿状
パルプおよび紙等の親水性繊維と吸水性樹脂の複合体が
使用されている。これら吸収性複合体に要求される機能
として、吸収容量、保形性が挙げられるが、最近では薄
型軽量のものが求められてきており、これに満足して答
えられる吸収性複合体の製造は困難となっている。薄型
にする技術として、特開平４−１１９１５６号には、吸
水性樹脂と親水性繊維を混合して乾式抄紙する技術が記
載されている。しかし、その方法で得られるシートは密
度が０．１〜０．５と嵩高であり、薄型化という点では
満足の行くものではない。2. Description of the Related Art Disposable disposable diapers currently on the market,
Almost all of absorbents such as sanitary napkins and the like are composites of hydrophilic fibers such as cotton-like pulp and paper and a water-absorbing resin. The functions required of these absorbent composites include absorption capacity and shape retention, but recently, thin and lightweight ones have been demanded, and the production of absorbent composites that can satisfy these requirements has been It has become difficult. As a technique for making the paper thinner, Japanese Patent Application Laid-Open No. 4-119156 describes a technique of mixing a water-absorbing resin and hydrophilic fibers to dry-form paper. However, the sheet obtained by this method is bulky, having a density of 0.1 to 0.5, and is not satisfactory in terms of thinning.
【０００３】また、必ずしも薄型という目的ではない
が、吸水性樹脂繊維を不織布シートにする方法が特開平
７−３６９２号で提案されているが、吸水性樹脂は吸水
するとゲル化するので湿潤時に極端にシート強度は低下
し、シート形状を保持することが難しく単独で使用する
のは難しい。また繊維状化したものも繊維としては強度
が弱く脆いため使用が困難である。Also, although not intended to be thin, a method of forming a water-absorbent resin fiber into a nonwoven sheet has been proposed in Japanese Patent Application Laid-Open No. 7-3692. In addition, the sheet strength is reduced, and it is difficult to maintain the sheet shape, and it is difficult to use the sheet alone. Also, those made into a fibrous form are difficult to use because they have low strength and are brittle as fibers.
【０００４】他に、粉末状の吸水性樹脂を吸収紙や不織
布などの支持体によりサンドイッチ構造にして固定させ
る方法があるが、この方法は吸水性樹脂が支持体の間で
圧着されているため、吸水性樹脂の吸収膨潤力を減殺
し、本来の吸収力を十分発揮できない欠点を有する。Another method is to fix the powdery water-absorbent resin in a sandwich structure using a support such as absorbent paper or nonwoven fabric. However, this method is because the water-absorbent resin is pressed between the supports. In addition, there is a disadvantage that the absorption swelling power of the water-absorbing resin is reduced and the original absorption power cannot be sufficiently exhibited.
【０００５】さらに、繊維間に均一に分散された吸水性
樹脂と繊維集合体との混合体であって、該混合体が多数
個に分割されていてカールした繊維が毛房状に絡んだ棒
状塊からなる吸収性シート（特公平１−２６７３６号公
報）が開示されているが、その製造物は吸収能力、吸収
速度にも優れているが、カールした繊維を使用している
ことから、嵩高であり、素材的に薄型のものをつくるの
は困難である。[0005] Furthermore, a mixture of a water-absorbent resin and a fiber aggregate uniformly dispersed between fibers, wherein the mixture is divided into a plurality of pieces, and a rod-like shape in which curled fibers are entangled in tufts. An absorptive sheet made of lumps (Japanese Patent Publication No. 26736/1990) is disclosed. The product is excellent in absorption capacity and absorption speed, but is bulky because it uses curled fibers. Therefore, it is difficult to make a thin material.
【０００６】特開平４−１６３３９７号には、吸水性樹
脂のエマルジョンを紙等に塗工または含浸する方法、お
よび、重合体エマルジョンを塗工・含浸してから化学的
な処理を施す方法が記載されている。しかし、この方法
は、シートを形成した後に化学的な処理をするという繁
雑な工程を必要とするという欠点がある。特開平５−３
４６５２４号には、有機溶剤にバインダー樹脂を溶解
し、これに粉末状の吸水性樹脂を分散させた液を不織布
に塗布・乾燥する方法が記載されているが、この方法で
は、バインダー樹脂により吸水性樹脂の表面が覆われ、
吸水能力が十分には発揮されず特殊な用途に限定され
る。JP-A-4-163973 describes a method of coating or impregnating a water-absorbent resin emulsion on paper or the like, and a method of coating and impregnating a polymer emulsion followed by a chemical treatment. Have been. However, this method has a disadvantage in that a complicated process of performing a chemical treatment after forming the sheet is required. JP-A-5-3
No. 46524 describes a method in which a binder resin is dissolved in an organic solvent, and a liquid in which a powdery water-absorbing resin is dispersed is applied to a nonwoven fabric and dried. In this method, water is absorbed by the binder resin. The surface of the conductive resin is covered,
Water absorption capacity is not fully exhibited and it is limited to special applications.
【０００７】[0007]
【発明が解決しようとする課題】本発明は、シート強度
が強く、吸水性樹脂とシートとの接着力が強く、薄型で
吸収能力、吸収速度にも優れた吸水性シートの製造方法
を提案することを課題とし、更に、安価で大量生産可能
な吸水性シートの製造方法を提案することを課題とす
る。SUMMARY OF THE INVENTION The present invention proposes a method for producing a water-absorbent sheet which is strong in sheet strength, has a strong adhesive force between the water-absorbent resin and the sheet, is thin and has excellent absorption capacity and absorption speed. Another object of the present invention is to propose a method of manufacturing a water-absorbent sheet that is inexpensive and can be mass-produced.
【０００８】[0008]
【課題を解決するための手段】上記課題を解決するた
め、本発明は下記の（１）〜（４）の構成を採用する。
（１）吸水性樹脂と微細繊維とが有機溶剤を主体とする
溶液に分散された塗料を基材に塗工することを特徴とす
る吸水性シートの製造方法（２）塗工がダイコーター、
カーテンコーター、ナイフコーター、スプレーコーター
から選択された装置によることを特徴とする上記（１）
に記載の吸水性シートの製造方法。（３）塗工および乾
燥後に吸水性シートをマシンの走行方向及び／または横
方向に延伸し、吸水性シートの塗工層にひび割れ模様を
つけることを特徴とする上記の（１）または（２）に記
載の吸水性シートの製造方法。（４）微細繊維の保水値
が３００％以上である（１）〜（３）のいずれかに記載
の吸水性シートの製造方法。In order to solve the above problems, the present invention employs the following constitutions (1) to (4).
(1) A method for producing a water-absorbent sheet, which comprises applying a coating material in which a water-absorbent resin and fine fibers are dispersed in a solution mainly composed of an organic solvent to a base material.
(1) characterized by using an apparatus selected from a curtain coater, a knife coater, and a spray coater.
3. The method for producing a water-absorbent sheet according to item 1. (3) The water-absorbent sheet is stretched in the running direction and / or the lateral direction of the machine after coating and drying to form a cracked pattern in the coating layer of the water-absorbent sheet, wherein (1) or (2) above. The method for producing a water-absorbent sheet according to (1). (4) The method for producing a water-absorbent sheet according to any one of (1) to (3), wherein the water retention value of the fine fibers is 300% or more.
【０００９】[0009]
【発明の実施の形態】本発明に使用する吸水性樹脂の形
態は粒子状または繊維状である。即ち、本発明では、粒
子状または繊維状の吸水性樹脂を有機溶剤を主体とする
溶液に分散して塗料を作製し、その塗料を基材シートに
塗工する。有機溶剤を主体とする溶液とは、有機溶剤の
みからなる溶液、または、有機溶剤６０重量％以上で水
４０重量％以下の混合溶液である。有機溶剤としては、
メタノール、エタノール、プロパノール、イソプロパノ
ール等の低級アルコール、エチレングリコール等の二級
アルコール類、アセトン等のケトン類、酢酸エチル、酢
酸メチルなどのエステル類など、吸水性樹脂を膨潤させ
ない溶剤である。また、有機溶剤と水を混合して使用す
る場合、水と分離せずに混合可能な溶媒を選択する必要
がある。また、２種以上の有機溶剤を混合することも差
し支えない。DESCRIPTION OF THE PREFERRED EMBODIMENTS The form of the water-absorbing resin used in the present invention is particulate or fibrous. That is, in the present invention, a coating material is prepared by dispersing a particulate or fibrous water absorbing resin in a solution mainly composed of an organic solvent, and the coating material is applied to a base sheet. The solution mainly composed of an organic solvent is a solution composed of only the organic solvent or a mixed solution containing 60% by weight or more of the organic solvent and 40% by weight or less of water. As organic solvents,
Solvents that do not swell the water-absorbent resin, such as lower alcohols such as methanol, ethanol, propanol and isopropanol, secondary alcohols such as ethylene glycol, ketones such as acetone, and esters such as ethyl acetate and methyl acetate. When an organic solvent and water are used as a mixture, it is necessary to select a solvent that can be mixed without being separated from water. Also, two or more organic solvents may be mixed.
【００１０】本発明に使用する吸水性樹脂としては、一
般に吸水性を有するものであれば何でも良く、例えば、
澱粉−ポリアクリロニトリルグラフト重合物の加水分解
物、澱粉−アクリル酸共重合物、カルボキシメチルセル
ロース架橋重合物、ポリアクリル酸ソーダ架橋物、セル
ロース−ポリアクリロニトリル共重合物の加水分解物、
メタクリル酸メチル−酢酸ビニル共重合物の加水分解
物、ポリビニルアルコール架橋重合物、ポリアクリロニ
トリル架橋体の加水分解物、ポリエチレンオキサイド架
橋重合物、ポリアクリルアミド架橋重合物、アクリルア
ミド−アクリル酸架橋共重合物、スルホアルキル（メ
タ）アクリレート−アクリル酸架橋共重合物、イソブチ
レン−無水マレイン酸共重合体中和物の架橋物などが挙
げられる。これらの吸水性樹脂はその１種を単独で用い
ても２種以上を組み合わせて用いてもよい。また、吸水
性樹脂は粉粒状であっても繊維状であっても良く、その
大きさは特に限定されるものではないが、粉粒状の場合
は３０μ〜１０００μ程度が好ましく、さらに好ましく
は５０μ〜３００μである。繊維状の場合には直径１０
μ以下、長さ１ｍｍ以下のものが好ましく、このように
サイズが小さい程、塗工した場合の均一性及び吸水性能
を向上させる。The water-absorbing resin used in the present invention may be any resin that generally has water-absorbing properties.
Starch-polyacrylonitrile graft polymer hydrolyzate, starch-acrylic acid copolymer, carboxymethylcellulose crosslinked polymer, sodium polyacrylate crosslinked product, cellulose-polyacrylonitrile copolymer hydrolyzate,
Hydrolyzate of methyl methacrylate-vinyl acetate copolymer, cross-linked polyvinyl alcohol, hydrolyzed cross-linked polyacrylonitrile, cross-linked polyethylene oxide polymer, cross-linked polyacrylamide polymer, cross-linked acrylamide-acrylic acid copolymer, A crosslinked product of a sulfoalkyl (meth) acrylate-acrylic acid crosslinked copolymer, a neutralized isobutylene-maleic anhydride copolymer, and the like are included. These water-absorbing resins may be used alone or in combination of two or more. The water-absorbent resin may be in the form of powder or granules or fibrous, and the size is not particularly limited. In the case of powder or granules, the size is preferably about 30 μm to 1000 μm, and more preferably 50 μm or less. 300μ. Diameter 10 if fibrous
It is preferable that the size is not more than μ and the length is not more than 1 mm. The smaller the size is, the more the uniformity and the water absorption performance when coated are improved.
【００１１】本発明で使用する微細繊維とは、セルロー
ス繊維を微細化したものである。その例として、例えば
パルプをサンドグラインダー処理したもの（特開平４−
１８１８６号公報）、また高圧均質化装置により微細繊
維化（特公昭６０−１９９２１号公報）したもの、コロ
イドミルにより微細繊維化（特公平４−５８９４８号公
報）したもの等が知られている。また微生物が作製する
バクテリアセルロースも使用可能である。The fine fibers used in the present invention are finely divided cellulose fibers. As an example thereof, for example, pulp treated with a sand grinder (Japanese Unexamined Patent Publication No.
No. 18186), those made into fine fibers by a high-pressure homogenizer (Japanese Patent Publication No. 60-19921), those made into fine fibers by a colloid mill (Japanese Patent Publication No. 4-58948), and the like are known. Bacterial cellulose produced by microorganisms can also be used.
【００１２】微細繊維の微細化の度合いは、保水値を指
標とすることができる。本発明に使用する微細繊維とし
ては、微細化の度合いが小さいと吸水性樹脂と基材およ
び吸水性樹脂同士の結合力が弱く、基材から吸水性樹脂
がとれてきてしまい、吸水性シートとして使用できない
ことがわかった。このため使用できる微細繊維の保水値
としては３００％以上、好ましくは３５０％以上のもの
を使用すると吸水性樹脂同士、吸水性樹脂と基材との結
合の優れた吸水性シートが得られることがわかった。保
水値は、ＪＡＰＡＮ ＴＡＰＰＩ Ｎｏ．２６−７８に
準じて測定したものである。微細繊維を固形分濃度６〜
９％の範囲に調製し、試料を絶乾重量で約０．７ｇとな
るように採取し、Ｇ３のガラスフィルターを有する遠心
管に入れ、遠心脱水処理を行い、湿潤重量と乾燥重量か
ら下記式によって保水値を算出した。保水値（％）＝
｛（Ｗ−Ｄ）／Ｄ｝×１００但し、Ｗは遠心脱水後の試
料湿潤重量（ｇ）、Ｄはその試料の乾燥重量（ｇ）であ
る。The degree of fineness of the fine fibers can be determined by using the water retention value as an index. As the fine fibers used in the present invention, the bonding strength between the water-absorbent resin and the substrate and the water-absorbent resin is weak when the degree of fineness is small, and the water-absorbent resin comes off from the substrate, and as a water-absorbent sheet Turned out to be unusable. Therefore, if the water retention value of the fine fibers that can be used is 300% or more, preferably 350% or more, a water-absorbent sheet excellent in bonding between water-absorbent resins and between a water-absorbent resin and a substrate can be obtained. all right. The water retention value is the value of JAPAN TAPPI No. It is measured according to 26-78. Fine fiber with solid concentration of 6 ~
A sample was prepared so as to be about 0.7 g in absolute dry weight, placed in a centrifuge tube having a G3 glass filter, subjected to centrifugal dehydration treatment, and subjected to the following formula from the wet weight and the dry weight. To calculate the water retention value. Water retention value (%) =
{(WD) / D} × 100 where W is the wet weight of the sample after centrifugal dehydration (g), and D is the dry weight of the sample (g).
【００１３】また、微細繊維と吸水性樹脂との配合比も
吸水性樹脂同士、吸水性樹脂と基材との結合性に影響
し、微細繊維の配合量は吸水性樹脂に対し０.３％以
上、１０％以下、好ましくは０.５％以上７％以下、更
に好ましくは０.５％以上５％以下である。配合比は塗
工量によっても影響し、塗工量が多いほど微細繊維の配
合量も多くする必要があるが、配合量が吸水性樹脂に対
し１５％を超えると吸水性シートが硬くなり、また吸水
性能も低下するため好ましくない。The mixing ratio between the fine fibers and the water-absorbing resin also affects the bonding between the water-absorbing resins and between the water-absorbing resin and the base material. Or more, 10% or less, preferably 0.5% or more and 7% or less, more preferably 0.5% or more and 5% or less. The blending ratio is also affected by the amount of coating, and the greater the amount of coating, the greater the amount of fine fibers to be blended. If the amount of blending exceeds 15% of the water-absorbent resin, the water-absorbent sheet becomes harder, In addition, the water absorption performance is undesirably reduced.
【００１４】基材に塗布する塗料組成については、塗料
に配合する吸水性樹脂と微細繊維を合わせたものを固形
分とすると、固形分と有機溶剤を主体とする溶液の配合
比は、固形分濃度として５〜４５重量％が適しており、
更に１５〜３５重量％が好ましい。固形分濃度が５重量
％未満であると乾燥に負担がかかるため好ましくなく、
また固形分濃度を上げすぎると塗料の流動性が悪くな
る。また、塗料の粘度の値としては１００〜１００００
ｃｐｓ、好ましくは１５０〜５０００ｃｐｓである。粘
度を調整するために酢酸ビニルポリマーのような粘度の
高い薬品を配合しても良い。粘度の値は、Ｂ型粘度計に
て＃４ローター、ローター回転数１２ｒｐｍで測定した
ものである。吸水性シートの用途によっては、塗料に柔
軟化剤、かぶれ防止剤、脱臭剤、抗菌剤等の添加剤を加
えても良い。As for the composition of the coating applied to the substrate, if the sum of the water-absorbent resin and the fine fibers to be added to the coating is taken as the solid content, the mixing ratio of the solid content and the solution mainly composed of an organic solvent is as follows. A concentration of 5 to 45% by weight is suitable,
Further, the content is preferably 15 to 35% by weight. When the solid concentration is less than 5% by weight, it is not preferable because a burden is imposed on drying.
On the other hand, if the solid content is too high, the fluidity of the paint will be poor. Further, the value of the viscosity of the paint is 100 to 10,000.
cps, preferably 150 to 5000 cps. A high viscosity chemical such as a vinyl acetate polymer may be blended to adjust the viscosity. The viscosity value was measured by a B-type viscometer at a # 4 rotor and a rotor rotation speed of 12 rpm. Depending on the use of the water-absorbent sheet, additives such as a softening agent, a rash inhibitor, a deodorant, and an antibacterial agent may be added to the paint.
【００１５】本発明の塗料を基材に塗布する方法として
は、例えば、ブレードコーター、エアドクターコータ
ー、ロールコーター、リバースロールコーター、バーコ
ーター、ダイコーター、カーテンコーター、グラビアコ
ーター、スプレーコーター、ナイフコーター、サイズプ
レスコーター、ゲートロールコーターなどの一般の塗工
装置が使用できるが、中でもダイコーター、カーテンコ
ーター、ナイフコーター、スプレーコーターなどの方式
が好ましい。ダイ方式では、Ｔ型ダイでもコートハンガ
ー型ダイでもよく、ダイの形状は塗料が均一に流出する
ものであればどのような型でも良い。またダイのリップ
の一部を塞ぐことによりストライプ形状のもの、間欠的
に塗料の送りをＯＮ、ＯＦＦして横縞形状の吸水性シー
トにしてもよい。ここで言うナイフコーターとは一般の
ナイフコーターのように紙の表面にナイフやブレードを
付けるものとは少し異なるが、基材に接している液だま
りから液がナイフ（平板）との間隙を通って一定の厚さ
に塗布されるものである。スプレーコーターでは、ノズ
ルでの詰まりの点から二液型のノズルの方が好ましが、
特に型を限定するものではない。これらの塗工法により
基材上に一層または多層に分けて塗工してもよい。Examples of the method of applying the coating material of the present invention to a substrate include a blade coater, an air doctor coater, a roll coater, a reverse roll coater, a bar coater, a die coater, a curtain coater, a gravure coater, a spray coater, and a knife coater. General coating apparatuses such as a size press coater and a gate roll coater can be used, and among them, systems such as a die coater, a curtain coater, a knife coater, and a spray coater are preferable. In the die method, a T-type die or a coat hanger type die may be used, and the shape of the die may be any type as long as the paint flows out uniformly. Alternatively, a strip-shaped water absorbing sheet may be formed by closing a part of the lip of the die, or may be turned on and off intermittently to turn on and off the feeding of the paint. The knife coater mentioned here is slightly different from a knife coater with a knife or blade attached to the paper surface like a general knife coater. Is applied to a certain thickness. In spray coaters, two-pack nozzles are preferred in terms of nozzle clogging,
The type is not particularly limited. These coating methods may be applied on the substrate in a single layer or in multiple layers.
【００１６】本発明に使用する基材とは、編布、織布及
び不織布状などのあらゆる形態のものを含み、その素材
は天然繊維たとえば綿、ジュート、木材パルプ、絹、キ
チンなど；半合成繊維たとえばビスコース、レーヨン、
アセテート、トリアセテートなど；合成繊維たとえばナ
イロン、アクリル、ポリエステル、ポリプロピレンな
ど、およびこれらの繊維の混合体があげられる。または
それらの組み合わせによる基材等何れでも良い。基材の
繊維と塗工された微細繊維の結合が必要であることか
ら、基材の繊維の親水性が弱いときには繊維表面の親水
化処理を行なうことが望ましい。The substrate used in the present invention includes all forms such as a knitted fabric, a woven fabric and a non-woven fabric, and is made of natural fibers such as cotton, jute, wood pulp, silk, chitin, etc .; Fibers such as viscose, rayon,
Acetates, triacetates and the like; synthetic fibers such as nylon, acrylic, polyester, polypropylene and the like, and mixtures of these fibers. Alternatively, it may be a base material or the like based on a combination thereof. Since it is necessary to bond the fibers of the substrate with the coated fine fibers, it is desirable to perform a hydrophilic treatment on the fiber surface when the fibers of the substrate have low hydrophilicity.
【００１７】吸水性シートにひび割れをつける方法とし
ては、乾燥後に吸水性シートをマシンの走行方向及び／
または横方向に延伸する方法が例示される。乾燥後に延
伸することにより、吸水性樹脂間の結合強度がそれほど
強くないため簡単にひび割れ模様をつけることができ
る。延伸は、例えば、高分子フィルムをマシンの走行方
向及び／または横方向に延伸配する装置を使用すればよ
い。また、延伸装置を塗工装置の中に組み込むんでも良
いし、一旦吸水性シートとして巻き取った後に別工程で
吸水性シートを延伸してもよい。As a method of cracking the water-absorbent sheet, the water-absorbent sheet is dried and then moved in the running direction of the machine and / or
Alternatively, a method of stretching in the lateral direction is exemplified. By stretching after drying, the bond strength between the water-absorbent resins is not so strong, and a cracked pattern can be easily formed. For stretching, for example, an apparatus that stretches and arranges the polymer film in the running direction and / or the transverse direction of the machine may be used. Further, the stretching device may be incorporated in the coating device, or the water-absorbing sheet may be stretched in a separate step after being wound as a water-absorbing sheet.
【００１８】[0018]
【実施例】以下、実施例により本発明をさらに説明する
が、本発明はこれらに限定されるものではない。尚、実
施例中の％または部数は、ことわりのない限り重量％、
重量部数を示す。EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto. The percentages or parts in the examples are by weight unless otherwise specified.
Indicates parts by weight.
【００１９】＜実施例１＞エタノール２２２部：水７６
部（８０：２０）の溶液に吸水性樹脂サンウェッブＩＭ
−１０００（三洋化成工業（株）製）１００部、バイン
ダーとして、パルプをサンドグラインダー処理にて作製
した保水値５５０％の微細繊維３部配合した塗料をカウ
レス分散機にて混合分散して調製した。坪量４０ｇ／ｍ
2のレーヨン不織布を基材にして、これに井上金属
（株）製ダイコーターを用い、ダイの塗出口のスリット
幅２．５ｍｍ、塗工速度１０ｍ／分、塗工幅５００ｍｍ
で上記塗料を塗工し、塗工量３１５ｇ／ｍ2の吸水性シ
ートを得た。塗工の操業性は基材の切れや塗工不良等も
なく、安定して塗工できた。また塗工量制御はダイヘッ
ドとバッキングロールの間のクリアランスを調節する
か、塗料の塗出量や塗料の固形分濃度を調節することに
よって行なった。Example 1 222 parts of ethanol: 76 water
Part (80:20) solution in water-absorbent resin sunweb IM
100 parts of -1000 (manufactured by Sanyo Kasei Kogyo Co., Ltd.), and a paint prepared by mixing pulp with 3 parts of fine fibers having a water retention value of 550% prepared by sand grinder treatment as a binder were mixed and dispersed by a Cowles dispersing machine. . Basis weight 40g / m
Using a rayon nonwoven fabric of No. 2 as a base material, using a die coater manufactured by Inoue Metal Co., Ltd., a slit width of a coating outlet of a die of 2.5 mm, a coating speed of 10 m / min, and a coating width of 500 mm
Was applied to obtain a water-absorbent sheet having a coating amount of 315 g / m 2 . The operability of the coating was stable without any breakage of the base material or coating failure. The coating amount was controlled by adjusting the clearance between the die head and the backing roll, or by adjusting the coating amount and the solid content of the coating.
【００２０】得られた吸水性シートから４００ｍｍ×１
５０ｍｍの大きさのサンプルを取り、吸水性樹脂と基材
との接着強度、また１００ｍｍ×１００ｍｍの大きさに
サンプルを取り水の吸収速度を測定し、結果を表１に示
した。また、測定方法については以下に説明する。From the water-absorbing sheet obtained, 400 mm × 1
A sample having a size of 50 mm was taken, and the adhesive strength between the water-absorbent resin and the substrate, and a sample having a size of 100 mm × 100 mm were measured for water absorption rate. The results are shown in Table 1. The measurement method will be described below.
【００２１】＜吸水性樹脂と基材との接着強度の測定＞
吸水性樹脂の接着の強さとしてセロテープを塗工面に貼
り付け、はがした後のセロテープの接着面に付着した吸
水性樹脂がセロテープ接着面全体の面積のどれだけを占
めているかを５段階で判断した。 <Measurement of adhesion strength between water-absorbent resin and substrate>
Adhesive cellophane tape is applied to the coated surface as the strength of the water-absorbent resin, and it is determined in 5 steps how much of the area of the entire surface of the cellophane adhesive surface is absorbed by the water-absorbent resin attached to the adhesive surface of the cellophane tape after peeling. It was judged.
【００２２】＜水の吸収速度の測定＞吸水性シートのサ
ンプルを１００ｍｍ×１００ｍｍの大きさに取り、真中
に直径２５ｍｍの穴の開いた重量６６０ｇ、大きさ１０
０ｍｍ×１００ｍｍの金属板を吸水性シートにのせ、水
５０ｃｃを金属板の穴に添加し水が吸収されるまでの時
間を測定する。これを３０分毎に３回くりかえし測定を
行った。<Measurement of Water Absorption Rate> A sample of the water-absorbent sheet was taken in a size of 100 mm × 100 mm, and a weight of 660 g having a hole having a diameter of 25 mm in the center and a size of 10
A metal plate of 0 mm × 100 mm is placed on the water-absorbent sheet, 50 cc of water is added to the hole of the metal plate, and the time until water is absorbed is measured. The measurement was repeated three times every 30 minutes.
【００２３】＜実施例２＞プロパノール４６５部：水２
００部（７０：３０）の溶液に吸水性樹脂サンウェッブ
ＩＭ−１０００（三洋化成工業（株）製）１００部、バ
インダーとして、パルプをサンドグラインダー処理にて
作製した保水値３４０％の微細繊維８部配合した塗料を
カウレス分散機にて混合分散して調製した。坪量４０ｇ
／ｍ2のレーヨン不織布を基材にして、リスタガンＭＧ
−６Ｂ（岩田塗装機工業製）スプレーガンを使用し、塗
料ノズル口径１５ｍｍ、空気ノズル径２．５ｍｍ、コン
プレッサー圧５ｋｇ／ｃｍ2にて基材からの距離５０ｃ
ｍで噴霧し塗工量１７０ｇ／ｍ2の吸収性シートを得
た。実施例１に比べ吸水性樹脂表面は多少凹凸があるが
基材と吸水性樹脂との接着力も良好なシートが得られ
た。得られた吸水性シートをサンプルを取り、吸水性樹
脂の接着強度、水の吸収速度の測定を行った。結果を表
１に示した。<Example 2> 465 parts of propanol: water 2
100 parts (70:30) of the solution, 100 parts of a water-absorbent resin Sunweb IM-1000 (manufactured by Sanyo Chemical Industries, Ltd.), and fine fibers 8 having a water retention value of 340% prepared by sand pulp processing as a binder 8 A part of the paint was mixed and dispersed by a Cowles dispersing machine to prepare. Basis weight 40g
/ M 2 rayon nonwoven fabric as a base material
Using a -6B (made by Iwata Coating Machine Industry) spray gun, paint nozzle diameter 15 mm, air nozzle diameter 2.5 mm, compressor pressure 5 kg / cm 2 , distance 50 c from substrate
m to obtain an absorbent sheet having a coating amount of 170 g / m 2 . Although the surface of the water-absorbent resin was somewhat uneven as compared with Example 1, a sheet having good adhesion between the substrate and the water-absorbent resin was obtained. A sample was taken from the obtained water-absorbent sheet, and the adhesive strength of the water-absorbent resin and the water absorption rate were measured. The results are shown in Table 1.
【００２４】＜実施例３＞メタノール２６３部：水１４
１部（６５：３５）の溶液に吸水性樹脂サンウェッブＩ
Ｍ−１０００（三洋化成工業（株）製）１００部、バイ
ンダーとして、パルプをサンドグラインダー処理にて作
製した保水値６７０％の微細繊維１部配合した塗料をカ
ウレス分散機にて混合分散して調製した。基材との間隙
が２ｍｍのアプリケーターバーを使用して坪量５０ｇ／
ｍ2のレーヨン、パルプ混合不織布の基材に調製した塗
料を塗工し塗工量２１０ｇ／ｍ2の吸水性シートを得
た。得られた吸水性シートからサンプルを取り、吸水性
樹脂の接着強度、水の吸収速度の測定を行った。結果を
表１に示した。<Example 3> 263 parts of methanol: water 14
Add 1 part (65:35) solution to water absorbent resin Sunweb I
100 parts of M-1000 (manufactured by Sanyo Kasei Kogyo Co., Ltd.), and as a binder, a coating prepared by mixing 1 part of fine fibers having a water retention value of 670% prepared by sand grinder treatment with a pulp was mixed and dispersed using a Cowles disperser. did. Using an applicator bar having a gap of 2 mm with the substrate, the basis weight is 50 g /
m 2 rayon, coating a coating material prepared on the substrate of the pulp mixed nonwoven fabric was obtained absorbent sheet of coating weight 210g / m 2. A sample was taken from the obtained water-absorbent sheet, and the adhesive strength of the water-absorbent resin and the water absorption rate were measured. The results are shown in Table 1.
【００２５】＜実施例４＞実施例１で作製した吸水性シ
ートを高分子フィルム加工用二軸延伸試験装置（東洋精
機（株）製）を用い、延伸速度０．３ｍ／分で横と縦方
向に引張り力をかけ、延伸倍率１．２倍の吸水性シート
を得た。吸水性シートの塗工部分にはランダムなひび割
れが出来ていた。得られた吸水性シートからサンプルを
取り、吸水性樹脂の接着強度、水の吸収速度の測定を行
った。結果を表１に示した。ひび割れを施しても基材と
吸水性樹脂との結合が強固く基材から脱離することはな
かった。ひび割れ部が水の道となり吸水速度が向上し
た。Example 4 The water-absorbent sheet prepared in Example 1 was horizontally and vertically stretched at a stretching speed of 0.3 m / min using a biaxial stretching test apparatus for polymer film processing (manufactured by Toyo Seiki Co., Ltd.). A tensile force was applied in the direction to obtain a water-absorbent sheet having a draw ratio of 1.2 times. The coated portion of the water-absorbent sheet had random cracks. A sample was taken from the obtained water-absorbent sheet, and the adhesive strength of the water-absorbent resin and the water absorption rate were measured. The results are shown in Table 1. Even after cracking, the bond between the base material and the water-absorbent resin was strong and did not detach from the base material. The cracks became water paths and the water absorption rate improved.
【００２６】＜比較例１＞実施例１の塗料のうちバイン
ダーの微細繊維に保水値２８０％のものを使用した以
外、実施例１と同じ条件で塗工し塗工量２９５ｇ／ｍ2
の吸水性シートを得た。得られた吸水性シートからサン
プルを取り、吸水性樹脂の接着強度、水の吸収速度の測
定を行った。結果を表１に示した。吸水性シートは、基
材と吸水性樹脂との接着が弱く、基材から剥離してしま
う状態であった。<Comparative Example 1> A coating amount of 295 g / m 2 was applied under the same conditions as in Example 1, except that among the paints of Example 1, those having a water retention value of 280% were used for the fine fibers of the binder.
Was obtained. A sample was taken from the obtained water-absorbent sheet, and the adhesive strength of the water-absorbent resin and the water absorption rate were measured. The results are shown in Table 1. In the water-absorbent sheet, the adhesion between the substrate and the water-absorbent resin was weak, and the water-absorbent sheet was peeled off from the substrate.
【００２７】[0027]
【表１】 [Table 1]
【００２８】[0028]
【発明の効果】以上の実施例により明らかなように、本
発明の吸水性シートの製造方法により得られた吸水性シ
ートは、基材から吸水性樹脂の脱離がなく、水吸収能の
優れた品質を持った吸水性シートを提供するという効果
を奏する。操業性に優れ、安価でかつ大量に生産が可能
であり、またその製造物は吸収能力、吸収速度にも優れ
た性能も持ち合わせている吸水性シートであるから、生
理用ナプキン、紙おむつ、失禁パッド、母乳パッド、医
療用パッド、湿布剤、貼付薬等の医療用衛材分野の吸収
物品における吸収体に最適である。また鮮度保持材、農
園芸用保水材、建築用止水材等保水、吸水の必要な種種
の用途に使用できる。As is apparent from the above examples, the water-absorbent sheet obtained by the method for producing a water-absorbent sheet of the present invention has no water-absorbing resin detached from the substrate and has excellent water-absorbing ability. This provides an effect of providing a water-absorbent sheet having excellent quality. Since it is a water-absorbent sheet that is excellent in operability, inexpensive and can be mass-produced, and has excellent absorption capacity and absorption speed, it is a sanitary napkin, disposable diaper, incontinence pad It is most suitable as an absorbent in absorbent articles in the field of medical safety materials, such as breast pads, medical pads, poultices, patches and the like. In addition, it can be used for various uses requiring water retention and water absorption, such as a freshness retaining material, a water retaining material for agriculture and horticulture, and a waterproofing material for construction.
Claims (4)
体とする溶液に分散された塗料を基材に塗工することを
特徴とする吸水性シートの製造方法1. A method for producing a water-absorbent sheet, comprising applying a coating material in which a water-absorbent resin and fine fibers are dispersed in a solution mainly composed of an organic solvent to a substrate.
ー、ナイフコーター、スプレーコーターから選択された
装置によることを特徴とする請求項１に記載の吸水性シ
ートの製造方法。2. The method for producing a water-absorbent sheet according to claim 1, wherein the coating is performed by an apparatus selected from a die coater, a curtain coater, a knife coater, and a spray coater.
ンの走行方向及び／または横方向に延伸し、吸水性シー
トの塗工層にひび割れ模様をつけることを特徴とする請
求項１または請求項２に記載の吸水性シートの製造方
法。3. The water-absorbent sheet is stretched in a running direction and / or a lateral direction of the machine after coating and drying to form a cracked pattern on a coating layer of the water-absorbent sheet. 3. The method for producing a water-absorbent sheet according to 2.
請求項１〜請求項３のいずれかに記載の吸水性シートの
製造方法。4. The method for producing a water-absorbent sheet according to claim 1, wherein the water retention value of the fine fibers is 300% or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31291297A JP3969464B2 (en) | 1997-10-30 | 1997-10-30 | Method for producing water absorbent sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31291297A JP3969464B2 (en) | 1997-10-30 | 1997-10-30 | Method for producing water absorbent sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11128825A true JPH11128825A (en) | 1999-05-18 |
| JP3969464B2 JP3969464B2 (en) | 2007-09-05 |
Family
ID=18034966
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31291297A Expired - Lifetime JP3969464B2 (en) | 1997-10-30 | 1997-10-30 | Method for producing water absorbent sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3969464B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002105382A (en) * | 1999-12-09 | 2002-04-10 | Kyodo Printing Co Ltd | Gas-barrier coating composition and gas-barrier film |
| JP2003096382A (en) * | 2001-09-27 | 2003-04-03 | Kyodo Printing Co Ltd | Gas barrier coating composition and gas barrier film |
| US7101438B2 (en) | 2001-08-27 | 2006-09-05 | Japan Absorbent Technology Institute | Coater for dispersed slurry |
| JP2007525313A (en) * | 2003-05-30 | 2007-09-06 | ザ プロクター アンド ギャンブル カンパニー | Compositions and methods for substrate coating |
| JP2008264161A (en) * | 2007-04-19 | 2008-11-06 | Oji Nepia Kk | Absorbent, method for manufacturing the same, and disposable diaper |
-
1997
- 1997-10-30 JP JP31291297A patent/JP3969464B2/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002105382A (en) * | 1999-12-09 | 2002-04-10 | Kyodo Printing Co Ltd | Gas-barrier coating composition and gas-barrier film |
| US7101438B2 (en) | 2001-08-27 | 2006-09-05 | Japan Absorbent Technology Institute | Coater for dispersed slurry |
| JP2003096382A (en) * | 2001-09-27 | 2003-04-03 | Kyodo Printing Co Ltd | Gas barrier coating composition and gas barrier film |
| JP2007525313A (en) * | 2003-05-30 | 2007-09-06 | ザ プロクター アンド ギャンブル カンパニー | Compositions and methods for substrate coating |
| JP4874098B2 (en) * | 2003-05-30 | 2012-02-08 | ザ プロクター アンド ギャンブル カンパニー | Compositions and methods for substrate coating |
| JP2008264161A (en) * | 2007-04-19 | 2008-11-06 | Oji Nepia Kk | Absorbent, method for manufacturing the same, and disposable diaper |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3969464B2 (en) | 2007-09-05 |
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