JP3155351B2 - Porous sheet and method for producing the same - Google Patents
Porous sheet and method for producing the sameInfo
- Publication number
- JP3155351B2 JP3155351B2 JP16138492A JP16138492A JP3155351B2 JP 3155351 B2 JP3155351 B2 JP 3155351B2 JP 16138492 A JP16138492 A JP 16138492A JP 16138492 A JP16138492 A JP 16138492A JP 3155351 B2 JP3155351 B2 JP 3155351B2
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- composition
- weight
- parts
- porous 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.)
- Expired - Fee Related
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
- A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
- A61F13/51474—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its structure
- A61F13/51484—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its structure being inhomogeneous in the plane of the sheet, i.e. having zones of different properties or structures
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
- A61F13/514—Backsheet, i.e. the impermeable cover or layer furthest from the skin
- A61F13/51474—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its structure
- A61F13/51478—Backsheet, i.e. the impermeable cover or layer furthest from the skin characterised by its structure being a laminate, e.g. multi-layered or with several layers
Landscapes
- Health & Medical Sciences (AREA)
- Dermatology (AREA)
- Epidemiology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Absorbent Articles And Supports Therefor (AREA)
- Orthopedics, Nursing, And Contraception (AREA)
- Laminated Bodies (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Molding Of Porous Articles (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、透湿性及び防水性のあ
る多孔性シート及びその製造方法に関するものであり、
詳しくは、シート強度及びシール性に優れ、且つ透湿
性、耐水圧性等を有する多孔性シート及びその製造方法
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a porous sheet having moisture permeability and waterproofness and a method for producing the same.
More specifically, the present invention relates to a porous sheet having excellent sheet strength and sealing properties, and having moisture permeability, water pressure resistance, and the like, and a method for producing the same.
【0002】[0002]
【従来の技術及び発明が解決しようとする課題】従来、
多孔性シートの製造方法として、ポリエチレンやポリプ
ロピレン等のオレフィン樹脂中に40重量%以上の無機
充填剤を混合しシート状に成形した後、一軸または二軸
方向に延伸する方法が知られている。このようにして得
られた多孔性シートは、通気性及び透湿性に優れ結露現
象を生じないため壁紙や包装用シート等に好適に用いら
れている。また、このような多孔性シートの優れた性質
に更に柔軟性を付与することにより、例えば、使い捨て
オムツの裏面材等に使用され、多孔性シートに柔軟性を
付与するためには、オレフィン樹脂として線状低密度ポ
リエチレンを用いること等が提案されている。2. Description of the Related Art
As a method for producing a porous sheet, there is known a method in which 40% by weight or more of an inorganic filler is mixed in an olefin resin such as polyethylene or polypropylene, and the mixture is formed into a sheet and then stretched uniaxially or biaxially. The porous sheet obtained in this manner is excellent in air permeability and moisture permeability and does not cause a dew condensation phenomenon, so that it is suitably used as a wallpaper or a sheet for packaging. Further, by imparting further flexibility to the excellent properties of such a porous sheet, for example, used for the back material of disposable diapers, etc., to impart flexibility to the porous sheet, as an olefin resin It has been proposed to use linear low-density polyethylene.
【0003】しかしながら、低密度ポリエチレンに充填
剤を多量に混合し、シート状に成形した後一軸延伸した
場合には、得られる延伸シートの異方性の物性低下とし
て特に縦(延伸)方向の引き裂き強度が低下する問題が
あった。また、二軸延伸した場合には充填剤と樹脂マト
リックスとの界面剥離現象を均一に行わせる延伸性(均
一白化性)及び表面強度に問題があった。特に一軸延
伸、二軸延伸シートは、ともにその後加工に好適なヒー
トシール性(接着性及び接着強度)が低下する欠点があ
った。However, when a large amount of filler is mixed with low-density polyethylene, formed into a sheet, and then uniaxially stretched, the resulting stretched sheet suffers from anisotropy in physical properties, in particular, tearing in the longitudinal (stretching) direction. There was a problem that the strength was reduced. Further, when biaxially stretched, there is a problem in stretchability (uniform whitening property) and surface strength for uniformly performing an interfacial peeling phenomenon between the filler and the resin matrix. Particularly, both the uniaxially stretched sheet and the biaxially stretched sheet have a disadvantage that the heat sealability (adhesiveness and adhesive strength) suitable for subsequent processing is reduced.
【0004】例えば、上記多孔性シートには、その加工
上、ホットメルト接着材による接着がされるが、その場
合の被着体は限定される上に十分な接着強度が得られ
ず、また、接着材を必要とする点から用途が制限され、
コストが高くなる欠点がある。更に、体圧変化の激しい
部分(例えば、吸収性物品の表面材又は裏面材として用
いた時の股間部等)では孔が大きくなって耐水圧が下が
ったり、接着材を介して取り付けられた止着テープが剥
がれ易い等の欠点がある。このように従来の多孔性シー
トは、その成形性或いは柔軟性、引っ張り・引き裂き強
度、ヒートシール性(接着性及び接着強度)透湿性、及
び耐水圧性等の要望する物性の全てを満足させることが
できない。従って、本発明の目的は、シート強度及びシ
ール性に優れ、且つ透湿性、耐水圧性等を有する多孔性
シート及びその製造方法を提供することにある。本発明
の目的はまた、吸収した体液を漏らさず気化放出して、
ムレることがなく、快適な装着感を与える吸収性物品を
提供することにある。For example, the above-mentioned porous sheet is bonded by a hot-melt adhesive during processing, but the adherend in this case is limited, and sufficient adhesive strength cannot be obtained. Applications are limited because of the need for adhesives,
There is a disadvantage that the cost increases. Further, in a portion where the body pressure changes drastically (for example, a crotch portion when used as a surface material or a back surface material of the absorbent article), a hole becomes large and a water pressure is reduced, or a stop attached via an adhesive is used. There are drawbacks such as the adhesive tape easily peeling off. As described above, the conventional porous sheet can satisfy all the required physical properties such as formability or flexibility, tensile / tear strength, heat sealability (adhesion and adhesive strength), moisture permeability, and water pressure resistance. Can not. Accordingly, an object of the present invention is to provide a porous sheet having excellent sheet strength and sealing properties, and having moisture permeability, water pressure resistance, and the like, and a method for producing the same. The object of the present invention is also to vaporize and release absorbed body fluid without leaking,
An object of the present invention is to provide an absorbent article which does not cause stuffiness and gives a comfortable wearing feeling.
【0005】[0005]
【課題を解決するための手段】本発明者等は、上記した
如き方法に準じてポリオレフィン系樹脂及び充填材、柔
軟化剤の組成物から特にヒートシール性、引っ張り強度
が改善された好適な多孔性シートを成形性よく得る目的
で種々検討した結果、極めて機能の優れた多孔性シート
を得ることができたものである。即ち、本発明は、ポリ
オレフィン系樹脂100重量部、充填材50〜400重
量部及び柔軟化剤0.1〜20重量部よりなる組成物
(a)のシート状物に、ポリオレフィン系樹脂100重
量部、充填材0〜40重量部及び柔軟化剤0〜10重量
部よりなる組成物(b)のシート状物を部分的に積層さ
せて延伸処理した多孔性シートであって、該延伸処理に
よって上記組成物(a)で形成される透湿性シートの単
層シート域と、該透湿性シート及び上記組成物(b)で
形成される非透湿性又は低透湿性シートが多層となった
多層シート域とを交互に且つ多列状に有していることを
特徴とする多孔性シートを提供することにより上記目的
を達成したものである。Means for Solving the Problems The inventors of the present invention have developed a suitable porous material having improved heat sealability and tensile strength, particularly from a composition of a polyolefin resin, a filler and a softening agent according to the method described above. As a result of various studies for the purpose of obtaining a porous sheet with good moldability, a porous sheet having extremely excellent functions was able to be obtained. That is, the present invention is a poly
100 parts by weight of olefin resin, 50-400 weight of filler
Composition comprising 0.1 part by weight and 0.1 to 20 parts by weight of a softening agent
(A) A sheet of polyolefin resin 100 weight
Parts by weight, filler 0-40 parts by weight and softener 0-10 parts by weight
Parts of the composition (b) consisting of
A porous sheet that has been subjected to a stretching process.
Therefore, the moisture-permeable sheet formed of the composition (a) is simply
A layer sheet area, the moisture-permeable sheet and the composition (b)
Non-pervious or low-pervious sheet formed is multilayered
The object has been achieved by providing a porous sheet having a multilayer sheet area alternately and in multiple rows .
【0006】また、本発明に係る多孔性シートの製造方
法であって、上記組成物(a)と、上記組成物(b)と
を共押出成形によって、上記組成物(a)に上記組成物
(b)を部分的に積層させたシート状物を成形し、該成
形シートを延伸処理することを特徴とする多孔性シート
の製造方法及び該多孔性シートを裏面材として用いるこ
とを特徴とする吸収性物品を提供することにより上記目
的を達成したものである。[0006] Also provided is a method for producing a porous sheet according to the present invention, the composition and (a), by co-extrusion and the composition (b), the composition of the above composition (a) (B) forming a sheet-like material partially laminated, and stretching the formed sheet;
And a method of using the porous sheet as a backing material.
By providing an absorbent article characterized by the above,
The goal has been achieved .
【0007】以下、本発明に係る多孔性シート及びその
製造方法について詳述する。本発明に係る多孔性シート
は透湿性シートと非透湿性又は低透湿性シートからな
り、これらのシートに主に用いられる組成物(a)及び
(b)のポリオレフィン系樹脂は、エチレン、プロピレ
ン等のオレフィン類の単独重合体あるいは共重合体が特
に制限なく用いられるが、中でも高密度ポリエチレン、
中密度ポリエチレン、線状低密度ポリエチレンといわれ
る中・低密度ポリエチレンが好ましく、特に密度が0.
910〜0.940g/cm3 でMFRが0.1〜10g
/10分、好ましくは0.1〜5g/10分の線状低密
度ポリエチレンが好ましく用いられる。また、本発明の
上記の如き重合体あるいは共重合体を2種以上混合する
ことも好ましく、特に結晶性ポリオレフィン樹脂にX線
による結晶化度5〜25%で且つ密度0.86〜0.9
0g/cm3 であるエチレンと他のα−オレフィンとの共
重合体(以下、軟質樹脂とも記す。)を配合してなる混
合樹脂を用いた場合には、得られる多孔性シートは透湿
性を損なうことなく柔軟性が付与されるため、特に引っ
張り・引き裂き強度に優れる。上記軟質樹脂は、一般に
結晶性ポリオレフィン系樹脂100重量部に対して20
〜100重量部の割合で配合される。尚、ポリオレフィ
ン系樹脂の特性を失わない範囲でポリオレフィン以外の
他の樹脂を配合してもよい。Hereinafter, the porous sheet according to the present invention and the method for producing the same will be described in detail. The porous sheet according to the present invention is composed of a moisture-permeable sheet and a moisture-impermeable or low moisture-permeable sheet, and the polyolefin-based resin of the compositions (a) and (b) mainly used for these sheets includes ethylene, propylene and the like. The olefin homopolymer or copolymer is used without any particular limitation, among which high-density polyethylene,
Medium- and low-density polyethylenes, which are called medium-density polyethylene and linear low-density polyethylene, are preferred.
MFR is 0.1 to 10 g at 910 to 0.940 g / cm 3
A linear low-density polyethylene of / 10 minutes, preferably 0.1 to 5 g / 10 minutes is preferably used. It is also preferable to mix two or more of the above-mentioned polymers or copolymers of the present invention. Particularly, the crystalline polyolefin resin has a crystallinity of 5 to 25% by X-ray and a density of 0.86 to 0.9.
When a mixed resin obtained by blending a copolymer of ethylene and another α-olefin of 0 g / cm 3 (hereinafter also referred to as a soft resin) is used, the resulting porous sheet has moisture permeability. Since flexibility is imparted without loss, it is particularly excellent in tensile and tear strength. The soft resin is generally used in an amount of 20 to 100 parts by weight of the crystalline polyolefin resin.
It is blended at a ratio of 100100 parts by weight. It should be noted that a resin other than the polyolefin may be blended as long as the properties of the polyolefin resin are not lost.
【0008】本発明に用いる充填材は制限されないが、
通常ゴム、又はプラスチック中に混合される充填材、例
えば、炭酸カルシウム、石膏、硫酸カルシウム、りん酸
カルシウム、炭酸マグネシウム、硫酸マグネシウム、水
和けい酸、無水けい酸、ソーダ灰、塩化ナトリウム、硫
酸ナトリウム、硫酸バリウム、タルク、クレー、各種セ
メント、火山灰、シラス、酸化チタン、酸化鉄、カーボ
ンブラック、種々の金属粉、その他の無機物または無機
物を主体とする有機物金属塩等が挙げられる。またフェ
ノール樹脂、エポキシ樹脂、ポリアクリル酸ソーダ等の
熱硬化性樹脂、ポリエチレン、ポリプロピレン、ポリア
クリルエステル等の熱可塑性樹脂を放射線等で架橋した
樹脂、上記成形(シート化)温度より高い樹脂等の有機
物が挙げられる。これらの充填材は50μm以下、好ま
しくは0.05〜30μmの範囲、特に0.1〜5μm
程度の平均粒径を有する粉粒体として用いることが望ま
しい。平均粒径が大きすぎる充填材を用いた場合には、
得られる延伸シートの孔の緻密性が低下し、また平均粒
径が小さすぎる充填材を用いた場合には、延伸ムラが生
じ易く良好な多孔性シートが得られない。[0008] The filler used in the present invention is not limited.
Fillers usually mixed in rubber or plastics, such as calcium carbonate, gypsum, calcium sulfate, calcium phosphate, magnesium carbonate, magnesium sulfate, hydrated silicic acid, silicic anhydride, soda ash, sodium chloride, sodium sulfate , Barium sulfate, talc, clay, various cements, volcanic ash, shirasu, titanium oxide, iron oxide, carbon black, various metal powders, and other inorganic substances or organic metal salts mainly composed of inorganic substances. In addition, thermosetting resins such as phenolic resins, epoxy resins, and sodium polyacrylate, resins obtained by crosslinking thermoplastic resins such as polyethylene, polypropylene, and polyacrylic ester with radiation and the like, resins higher than the above-mentioned molding (sheeting) temperature, etc. Organic substances. These fillers are 50 μm or less, preferably in the range of 0.05 to 30 μm, especially 0.1 to 5 μm
It is desirable to use it as a powder having a mean particle diameter of the order. If a filler with too large an average particle size is used,
When the denseness of the pores of the obtained stretched sheet is reduced and a filler having an average particle size that is too small is used, unevenness in stretching tends to occur and a good porous sheet cannot be obtained.
【0009】組成物(a)における充填材の配合量は、
ポリオレフィン系樹脂100重量部に対して50〜40
0重量部、好ましくは60〜300重量部であり、50
重量部より少ない場合には得られる多孔性シートの透湿
性域の連通孔が少なくなるため透湿性が小さくなり、ま
た400重量部を上回る場合ではシート状物の成形及び
延伸が困難になる。また、組成物(b)における充填材
の配合量は、ポリオレフィン系樹脂100重量部に対し
て0〜40重量部、好ましくは0〜20重量部であり、
0重量部の場合には多孔性シートの非透湿性又は低透湿
性が全くの非透湿性域或いはそれに近いものが得られ、
40重量部を上回ると、フィルム強度、ヒートシール性
が低下する。The compounding amount of the filler in the composition (a) is as follows:
50 to 40 with respect to 100 parts by weight of polyolefin resin
0 parts by weight, preferably 60 to 300 parts by weight;
When the amount is less than part by weight, the number of communication holes in the moisture-permeable region of the obtained porous sheet is reduced, so that the moisture permeability is reduced. When the amount is more than 400 parts by weight, it becomes difficult to form and stretch the sheet. The compounding amount of the filler in the composition (b) is 0 to 40 parts by weight, preferably 0 to 20 parts by weight, based on 100 parts by weight of the polyolefin resin.
In the case of 0 parts by weight, the non-permeability or low-permeability of the porous sheet is obtained in a completely non-permeable region or close thereto.
If the amount exceeds 40 parts by weight, the film strength and the heat sealability are reduced.
【0010】本発明に用いる柔軟化剤は特に制限されな
いが、通常ゴム、またはプラスチック中に混合される可
塑剤または滑剤、例えば、脂肪酸と脂肪族アルコールか
らなるモノエステル、芳香族カルボン酸と脂肪族アルコ
ールからなるモノエステルまたはポリエステル、脂肪族
ポリカルボン酸とポリアルコールからなるポリエステ
ル、モノカルボン酸及び/またはポリカルボン酸とモノ
アルコール及び/またはポリアルコールからなるポリエ
ステル、及びアルコール及び/またはカルボン酸の一部
を残したエステルまたはポリエステル、脂肪族アミド、
芳香族アミド、脂肪酸の金属石鹸、芳香族カルボン酸の
金属石鹸、ポリブタジエンオリゴマー、ポリブテンオリ
ゴマー、イソブチレンオリゴマー、イソプレンオリゴマ
ー、石油樹脂、クマロン樹脂、ケトン樹脂、塩素化パリ
フィン、シリコーン油、流動パラフィン、ポリエチレン
ワックス等である。[0010] The softening agent used in the present invention is not particularly limited, but a plasticizer or a lubricant usually mixed in rubber or plastic, for example, a monoester composed of a fatty acid and an aliphatic alcohol, an aromatic carboxylic acid and an aliphatic carboxylic acid. Monoesters or polyesters composed of alcohols, polyesters composed of aliphatic polycarboxylic acids and polyalcohols, polyesters composed of monocarboxylic acids and / or polycarboxylic acids and monoalcohols and / or polyalcohols, and alcohols and / or carboxylic acids. Ester or polyester, aliphatic amide,
Aromatic amide, fatty acid metal soap, aromatic carboxylic acid metal soap, polybutadiene oligomer, polybutene oligomer, isobutylene oligomer, isoprene oligomer, petroleum resin, cumarone resin, ketone resin, chlorinated parifin, silicone oil, liquid paraffin, polyethylene wax And so on.
【0011】組成物(a)における柔軟化剤の配合量
は、ポリオレフィン系樹脂100重量部に対し0.1〜
20重量部、特に0.5〜10重量部配合することが好
ましい。配合量は柔軟化剤のポリオレフィンとの親和
性、充填材との親和性及び多孔性シートに要求される柔
軟性によって決められるが、0.1重量部より少ないと
実質的に柔軟化効果がなく、20重量部より多くなると
シート表面にブリードアウトしてベタツキ、接着不良と
なる。組成物(b)における柔軟化剤の配合量は、ポリ
オレフィン系樹脂100重量部に対し0〜10重量部、
特に0〜7重量部配合することが好ましい。配合量は柔
軟化剤のポリオレフィンとの親和性、充填材との親和性
及び多孔性シートに要求される柔軟性によって決められ
るが、10重量部より多くなるとシート表面にブリード
アウトしてベタツキ、接着不良となる。The amount of the softening agent in the composition (a) is 0.1 to 100 parts by weight of the polyolefin resin.
It is preferable to add 20 parts by weight, particularly 0.5 to 10 parts by weight. The amount is determined by the affinity of the softener with the polyolefin, the affinity with the filler and the flexibility required for the porous sheet, but if less than 0.1 part by weight, there is substantially no softening effect. If it exceeds 20 parts by weight, it bleeds out to the sheet surface, causing stickiness and poor adhesion. The blending amount of the softening agent in the composition (b) is 0 to 10 parts by weight based on 100 parts by weight of the polyolefin resin.
Particularly, it is preferable to add 0 to 7 parts by weight. The blending amount is determined by the affinity of the softening agent with the polyolefin, the affinity with the filler, and the flexibility required for the porous sheet. However, if it exceeds 10 parts by weight, it bleeds out to the sheet surface and becomes sticky and adheres. It becomes bad.
【0012】本発明に係る上記多孔性シートの製造方法
としては、組成物(a)のシート状物の一部に組成物
(b)を多層状に形成して延伸する以外に以下の方法が
ある。例えば、組成物(a)等からなるシート状物を
延伸処理した透湿性シートに、非透湿シート層をエマル
ジョン又は溶液の塗布方法により形成したもの、組成
物(a)等からなるシート状物を延伸処理した透湿性シ
ートに、延伸処理した非透湿性シートを適宜ラミネート
して形成したものなどがある。延伸前のシート状物に非
透湿性シートを多層する方法又は延伸後の透湿性シート
に多層する方法は、上記エマルジョン又は溶液の塗布方
法でもラミネート方法でもよい。本発明においては、組
成物(a)のシート状物の一部に組成物(b)を多層状
に、上記塗布方法でものよいが特にラミネート形成し
て、延伸する方法を示すが、このような構成はシート状
物の成形、及びその延伸が極めて容易に達成される。し
かも得られる多孔性シートは透湿性、耐水圧を保持した
まま、特に引っ張り強度、ヒートシール性、シール部の
接着強度に優れた多孔性シートが得られる。The method for producing the porous sheet according to the present invention includes the following method in addition to forming the composition (b) in a multilayer shape on a part of the sheet material of the composition (a) and stretching the composition. is there. For example, a sheet made of the composition (a) or the like formed by applying a non-moisture permeable sheet layer by an emulsion or solution coating method to a moisture-permeable sheet obtained by stretching a sheet made of the composition (a) or the like Is formed by appropriately laminating a stretched non-permeable sheet to a stretched moisture-permeable sheet. The method of multilayering a moisture-impermeable sheet on the sheet before stretching or the method of multilayering on the moisture-permeable sheet after stretching may be the above-described method of applying an emulsion or a solution or a laminating method. In the present invention, a method of stretching the composition (b) on a part of a sheet-like material of the composition (a) in a multi-layered form may be used. With such a structure, molding and stretching of the sheet can be achieved very easily. In addition, the resulting porous sheet retains moisture permeability and water pressure resistance, and is particularly excellent in tensile strength, heat sealability, and adhesive strength of the seal portion.
【0013】多孔性シートの組成物(a)からのみ形成
される透湿性域と、組成物(b)が多層状に形成された
高強度域との面積や形状は特に制限されないが、いずれ
においても、透湿性と強度性の観点から、組成物(a)
のみの透湿性域の面積が該シート全体の20〜95%が
好ましく、40〜80%が特に好ましい。また、強度面
からシート端部は組成物(b)が積層されている構成域
である方が好ましい。また、前者と後者の表面積比は、
成形方向に対して一定である必要はなく、むしろ、該シ
ートを用いた最終製品の形状、要求特性に合わせ、成形
方向と直角方向に繰り返し変化(又は増減)させる方が
好ましい。このような形状は、通常の共押出成形技術に
おいて行われている。即ち、ダイの両樹脂流路、合流部
形状と(a)、(b)の溶融流動特性及びダイへの供給
速度を調整することによって容易に得られる。The area and shape of the moisture-permeable region formed only from the composition (a) of the porous sheet and the high-strength region formed of the composition (b) in a multilayer shape are not particularly limited. Also, from the viewpoint of moisture permeability and strength, the composition (a)
The area of the moisture-permeable region alone is preferably 20 to 95% of the entire sheet, and particularly preferably 40 to 80%. Further, from the viewpoint of strength, it is preferable that the end portion of the sheet is a constituent area where the composition (b) is laminated. The surface area ratio of the former and the latter is
It is not necessary to be constant in the forming direction, but rather it is preferable to repeatedly change (or increase or decrease) in the direction perpendicular to the forming direction according to the shape and required characteristics of the final product using the sheet. Such a shape is used in a usual co-extrusion molding technique. That is, it can be easily obtained by adjusting both resin flow paths of the die, the shape of the merging portion, the melt flow characteristics (a) and (b), and the supply speed to the die.
【0014】組成物(a)からなる透湿性シートの透湿
度は、0.4〜6g/100cm2 ・Hr、特に好ましくは
0.8〜4g/100cm2 ・Hrである。また、組成物
(a)からなる透湿性シートに組成物(b)からなる非
透湿性又は低透湿性シートが多層になった非透湿性又は
低透湿性域の透湿度は、0〜0.3g/100cm2 ・H
r、特に好ましくは0.01〜0.2g/100cm2 ・H
rである。透湿性シートの単層シート部分での透湿度が
0.4g/100cm2 ・Hrを下回ると、むれ防止等の効
果が劣り、また逆にその透湿度が6g/100cm2 ・Hr
を超えると、耐水圧が低下し、防漏性が低下する。多層
シート部分での透湿度が0.3g/100cm 2 ・Hrを超
えると、接着強度、引っ張り強度が低下し、ヒートシー
ル強度も低下する。The moisture permeability of the moisture-permeable sheet comprising the composition (a)
The degree is 0.4-6g / 100cmTwo・ Hr, particularly preferably
0.8-4g / 100cmTwo・ Hr. Also the composition
(A) a non-woven sheet comprising the composition (b);
Non-breathable or multi-layered breathable or low-breathable sheet
The moisture permeability of the low moisture permeability region is 0 to 0.3 g / 100 cm.Two・ H
r, particularly preferably 0.01 to 0.2 g / 100 cmTwo・ H
r. The moisture permeability of the single layer sheet part of the moisture permeable sheet
0.4g / 100cmTwo・ If it is lower than Hr, it will be effective in preventing
Poor fruit, and conversely, its moisture permeability is 6g / 100cmTwo・ Hr
When it exceeds, the water pressure resistance decreases, and the leakproofness decreases. multilayer
Moisture permeability in the sheet part is 0.3g / 100cm Two・ Hr
The adhesive strength and tensile strength decrease,
Also, the strength of the metal decreases.
【0015】このように構成された多孔性シートによれ
ば、組成物(a)からなる単層シート域と組成物(a)
と組成物(b)からなる多層シート域が交互に多列に存
在するため、組成物(a)からなる単層シート域で防水
性(耐水圧)を保持したまま透湿性を発現し、組成物
(a)と組成物(b)からなる多層シート域で接着性
(ヒートシール性、ホットメルト接着性)、引っ張り強
度を分担し、総合的に、透湿性、耐水圧、ヒートシール
性、接着性、引っ張り強度に優れたシートが得られ、後
述の生理用ナプキン、使い捨ておむつ、創傷被覆材等の
吸収性物品の裏面材に好適である。According to the porous sheet thus constituted, a single-layer sheet area composed of the composition (a) and the composition (a)
And the multilayer sheet region composed of the composition (b) is alternately present in multiple rows, so that the single-layer sheet region composed of the composition (a) exhibits moisture permeability while maintaining waterproofness (water pressure resistance). Adhesiveness (heat sealability, hot melt adhesiveness) and tensile strength are shared in the multilayer sheet area composed of the product (a) and the composition (b). Overall, moisture permeability, water pressure resistance, heat sealability, adhesion A sheet having excellent properties and tensile strength is obtained, and is suitable for a back surface material of an absorbent article such as a sanitary napkin, a disposable diaper, and a wound covering material described below.
【0016】図1は、本発明に係る多孔性シートを裏面
材として用いた吸収性物品の一実施例を示し、該吸収性
物品の一部切欠して示した斜視図である。また、図2
(a)は、吸収性物品に用いられる裏面材の平面図、
(b)は図(a)のe−e線に沿う断面図、(c)は同
f−f線に沿う断面図である。図3は、本発明に係る多
孔性シートの製法の一実施例を示し、図3(a)はイン
フレーション法による延伸前シートの断面図、図3
(b)は(a)の切開シート断面図である。FIG. 1 is a perspective view showing one embodiment of an absorbent article using the porous sheet according to the present invention as a back material, and showing the absorbent article with a part cut away. FIG.
(A) is a plan view of a back material used for the absorbent article,
(B) is a sectional view taken along line ee in FIG. (A), and (c) is a sectional view taken along line ff in FIG. FIG. 3 shows one embodiment of a method for producing a porous sheet according to the present invention, and FIG. 3 (a) is a cross-sectional view of a sheet before stretching by an inflation method.
(B) is a sectional view of the incision sheet of (a).
【0017】図1は、吸収性物品の1つである生理用ナ
プキン1を示したものであり、生理用ナプキン1は、液
透過性の表面材2と、防漏性の裏面材4と、これら両面
材の間に配置される吸収体3とからなる。このような生
理用ナプキン1(おおむね50〜150mm幅)の裏面材
4には、図2に示す如く、非透過性域4Bと透過性域4
Aとから構成される上記多孔性シートを用い、その適用
に於ける多孔シートの透過性域の位置的構成は、非透過
性域4B−透過性域域4A−非透過性域4B−透過性域
4A−非透過性域4B、非透過性域4B−透過性域4A
−非透過性域4Bの構成が好ましく、該ナプキンの長さ
方向両端部では非透過性域4Bが占める比率が95〜7
0%、中央部では5〜30%が占めることが特に好まし
い。FIG. 1 shows a sanitary napkin 1 which is one of the absorbent articles. The sanitary napkin 1 has a liquid-permeable surface material 2, a leak-proof back material 4, And an absorber 3 disposed between these two side materials. As shown in FIG. 2, the back material 4 of the sanitary napkin 1 (approximately 50 to 150 mm wide) has a non-permeable area 4B and a permeable area 4B.
A. The above-mentioned porous sheet comprising A is used, and in the application, the positional configuration of the permeable area of the porous sheet is as follows: non-permeable area 4B-permeable area 4A-non-permeable area 4B-permeable Area 4A-non-permeable area 4B, non-permeable area 4B-transparent area 4A
-The configuration of the non-permeable area 4B is preferable, and the ratio of the non-permeable area 4B at both ends in the length direction of the napkin is 95 to 7
It is particularly preferred that 0% and 5-30% occupy the center.
【0018】また、使い捨てオムツ(おおむね200〜
600mm幅)の場合、大きさ/形状によって非透過性域
4B−透過性域4A−非透過性域4B・・・・・−透過
性域4A−非透過性域4Bの繰り返し数が選択される。
オムツの場合はファスニングテープが接する前端部は非
透過性域4Bが占める比率がほぼ100%に近いほど好
ましい。このように構成される吸収性物品は、吸収した
体液を漏らさず、また、その液を容易に気化放出して、
ムレることが無く、快適な装着感を与える。In addition, disposable diapers (about 200-
In the case of (600 mm width), the number of repetitions of the non-transmissive area 4B, the transmissive area 4A, the non-transmissive area 4B,... .
In the case of a diaper, it is preferable that the ratio of the non-transmissive area 4B at the front end to which the fastening tape is in contact is almost 100%. The absorbent article configured in this manner does not leak the absorbed body fluid, and easily vaporizes and releases the fluid,
Gives a comfortable fit without stuffiness.
【0019】本発明に係る多孔性シートの製造方法にお
いて、組成物の調製は一般にヘンシェルミキサー等の高
速攪拌(混合)を用いて、上記オレフィン樹脂、充填
材、柔軟化剤を混合する。さらに好ましくは、該混合物
を二軸押出機等によって溶融混練し、ペレット状に成形
される。かかる調製において、少量の安定剤、着色剤、
あるいは滑剤を同時に或いは別途に混合することもでき
る。In the method for producing a porous sheet according to the present invention, the composition is generally prepared by mixing the olefin resin, the filler, and the softening agent using high-speed stirring (mixing) such as a Henschel mixer. More preferably, the mixture is melt-kneaded by a twin-screw extruder or the like and formed into a pellet. In such preparations, small amounts of stabilizers, colorants,
Alternatively, the lubricant can be mixed simultaneously or separately.
【0020】上記組成物(a)/組成物(b)が部分的
に多層に構成されたシート状物の製造法は特に制限され
ないが、2以上の押出機を用いる共押出成形が好まし
い。共押出による場合、透湿性域4A−非透湿性域4B
−透湿性域4A−・・・・・の繰り返し数が多くなって
もダイ製作によって容易に決まり、また、成形方向への
各々面積比を逐次または繰り返し変化させるのもダイ構
造と押出機の吐出量制御で決まり、後は2組成物を2つ
の押出機から供給するのであるから製造上なんら負担増
にならない。The method for producing a sheet-like material in which the composition (a) / composition (b) is partially formed into a multilayer is not particularly limited, but coextrusion molding using two or more extruders is preferred. In the case of co-extrusion, the moisture permeable area 4A-the moisture-impermeable area 4B
-Moisture permeable area 4A-Even if the number of repetitions is large, it is easily determined by the die production, and the area ratio in the molding direction is also changed sequentially or repeatedly in the die structure and the discharge of the extruder. Since the two compositions are supplied from two extruders, no additional burden is imposed on the production.
【0021】共押出成形シートの成形法にはインフレー
ション法(サーキュラーダイ法)とTダイ法(フラット
ダイ法)があり、本発明の延伸前シート成形は両法とも
に容易に用いることができる。成形温度は、インフレー
ション法ではポリオレフィン樹脂の融点の20〜90℃
高い温度が好ましく、Tダイ法の場合は更に20〜50
℃高い温度が好ましい。図3はインフレーション法によ
って製造された本発明に係る多層シート状物を示したも
のである。There are two methods for forming a co-extruded sheet: an inflation method (circular die method) and a T-die method (flat die method), and the sheet forming before stretching of the present invention can be easily used in both methods. The molding temperature is 20 to 90 ° C. of the melting point of the polyolefin resin in the inflation method.
High temperatures are preferred, and in the case of the T-die method, an additional 20 to 50
C. higher temperatures are preferred. FIG. 3 shows a multilayer sheet according to the present invention manufactured by the inflation method.
【0022】シート状物のロール延伸法としては、一軸
延伸、または一軸延伸後、引続きテンター延伸機、エア
ーインフレーション延伸機、マンドレル延伸機などによ
り横方向に逐次二軸延伸するか、あるいは同時に縦及び
横方向に延伸する方法が採用される。延伸温度は、一般
に常温以上でポリオレフィン樹脂の融点以下、特に融点
より10℃低い温度が好ましい。また、延伸倍率は少な
くとも一軸方向に1.2倍以上4倍以下、即ち一軸延伸
の場合は縦(MD)方向に、また二軸延伸の場合は、縦
(MD)、横(TD)方向にそれぞれ1.2倍以上4倍
以下とするとが、力学的バランスや強度の保持と同時に
優れた透湿性及び耐水圧性を示すために好ましい。さら
に一般にはかかる延伸工程に次いで、緊張下で熱処理を
行った後、延伸温度以下に室温まで冷却して取り出すこ
とが好ましい。また、上記シートの印刷性や接着力を改
良するために、コロナ放電処理等の表面処理を行うこと
もできる。As a roll stretching method for a sheet-like material, uniaxial stretching, or after uniaxial stretching, successively biaxially stretching in the horizontal direction by a tenter stretching machine, an air inflation stretching machine, a mandrel stretching machine, or the like, or simultaneously, in the longitudinal and longitudinal directions, A method of stretching in the transverse direction is employed. The stretching temperature is generally from room temperature to the melting point of the polyolefin resin, preferably a temperature 10 ° C. lower than the melting point. The stretching ratio is at least 1.2 times or more and 4 times or less in the uniaxial direction, that is, in the case of uniaxial stretching, in the longitudinal (MD) direction, and in the case of biaxial stretching, in the longitudinal (MD), transverse (TD) directions. The ratio is preferably 1.2 times or more and 4 times or less, respectively, in order to maintain excellent mechanical balance and strength and simultaneously exhibit excellent moisture permeability and water pressure resistance. More generally, it is preferable that after the stretching step, a heat treatment is performed under tension, and then cooled to room temperature below the stretching temperature and taken out. Further, in order to improve the printability and the adhesive strength of the sheet, a surface treatment such as a corona discharge treatment may be performed.
【0023】このような製造方法によれば、共押出成形
等によって、組成物(b)を組成物(a)の所望の位置
に容易に重合させることができ、また、その後の延伸処
理によって、組成物(a)のみからなる領域を透湿性領
域4Aとし、組成物(a)及び組成物(b)からなる領
域を非透湿性領域4Bとすることができるので、結局、
多孔性シートの所望の位置に透湿性領域を簡単に設ける
ことができ、しかも、必要部分に容易にヒートシール強
度性を持たせることができる。According to such a production method, the composition (b) can be easily polymerized at a desired position of the composition (a) by coextrusion molding or the like. Since the region composed only of the composition (a) can be the moisture-permeable region 4A, and the region composed of the composition (a) and the composition (b) can be the non-permeable region 4B.
It is possible to easily provide a moisture-permeable region at a desired position of the porous sheet, and it is possible to easily impart heat sealing strength to a necessary portion.
【0024】[0024]
組成物の調製:組成物(a)の配合を線状低密度ポリエ
チレン(ウルトゼックス2520F、三井石油化学工業
(株))100重量部、表面処理炭酸カルシウム(平均
粒径1.1μm)150重量部、及びポリエステル(ト
リメチロールプロパン/アジピン酸/ステアリン酸=2
モル/1モル/4モルからなるSV=240、AV=
1、OHV=8)5重量部 組成物(b)の配合を線状低密度ポリエチレン(組成物
(a)用と同じ)100重量部、酸化チタン(石原産業
(株)、R−550、平均粒径0.2μm)3重量部、
及びポリエステル(組成物(a)用と同じ))0.3重
量部 上記組成物を各々100リッターヘンシェルミキサーで
混合し、次いで径45mmの二軸押出機で混練ペレット
とした。Preparation of composition: 100 parts by weight of linear low-density polyethylene (Ultzex 2520F, Mitsui Petrochemical Industries, Ltd.) and 150 parts by weight of surface-treated calcium carbonate (average particle size 1.1 μm) were blended with composition (a). , And polyester (trimethylolpropane / adipic acid / stearic acid = 2
SV consisting of mol / 1 mol / 4 mol = 240, AV =
1, OHV = 8) 5 parts by weight Composition of composition (b) was 100 parts by weight of linear low-density polyethylene (same as for composition (a)), titanium oxide (Ishihara Sangyo Co., Ltd., R-550, average) Particle size 0.2 μm) 3 parts by weight,
And 0.3 parts by weight of polyester (same as for composition (a)) Each of the above compositions was mixed with a 100 liter Henschel mixer, and then kneaded into pellets with a twin screw extruder having a diameter of 45 mm.
【0025】シート成形:組成物(a)用押出機として
径32mmの単軸押出機(以降、a押出機と称す)、組成
物(b)用押出機として径25mmの単軸押出機(以降、
b押出機と称す)を用い、それ自体公知の共押出サーキ
ュラーダイにて下記成形条件で、切開後のシート幅30
0mmの部分多層シートを成形した(図3と同じパター
ン)。 ダイ径φ60mm、ダイリップクリアランス=1mm シリンダイ−温度(℃) ダイ温度(℃) 引き取り速度 a押出機 160−170−175 180 10m/分 b押出機 160−170−175Sheet forming: A single-screw extruder having a diameter of 32 mm (hereinafter referred to as a extruder) as an extruder for the composition (a) and a single-screw extruder having a diameter of 25 mm (hereinafter referred to as an extruder) for the composition (b) ,
b), using a co-extrusion circular die known per se under the following molding conditions under a sheet width 30 after incision.
A 0 mm partial multilayer sheet was formed (the same pattern as in FIG. 3). Die diameter φ60mm, Die lip clearance = 1mm Cylinder a-temperature (° C) Die temperature (° C) Pick-up speed a Extruder 160-170-175 180 10m / min b Extruder 160-170-175
【0026】延伸成形:径200mm、幅300mmのロー
ル延伸機を用い、上記シート成形機に連結して、厚さ6
0μmのシートを80℃で2.3倍延伸した。延伸後の
シートパターンは図2(a)と同じで、図2(b)部で
4Bが幅50mm、長さ約40mm、厚さ約8μ、図2
(c)部で幅10mm、長さ100mm、厚さ約10μm、
e−e部からf−f部の長さは90mmであった。また、
シートの厚さは約40μmであった。Stretching: Using a roll stretching machine with a diameter of 200 mm and a width of 300 mm, connected to the above-mentioned sheet molding machine, and having a thickness of 6 mm.
The 0 μm sheet was stretched 2.3 times at 80 ° C. The sheet pattern after stretching is the same as that of FIG. 2 (a). In FIG. 2 (b), 4B has a width of 50 mm, a length of about 40 mm and a thickness of about 8 μm.
(C) part width 10mm, length 100mm, thickness about 10μm,
The length from the ee part to the ff part was 90 mm. Also,
The thickness of the sheet was about 40 μm.
【0027】比較例 上記実施例の組成物(a)のペレットを用い、通常のイ
ンフレッションフィルム成形機で実施例と同じ温度、引
取り速度で厚さ60μmのシートを成形、実施例と同じ
条件で延伸した。得られたシート厚さは約40μmであ
った(図4)。Comparative Example Using a pellet of the composition (a) of the above example, a sheet having a thickness of 60 μm was formed at the same temperature and take-up speed by the usual inflation film forming machine under the same conditions as in the example. Stretched. The obtained sheet thickness was about 40 μm (FIG. 4).
【0028】(評価基準) (1)透湿度:JIS ZO208に準拠して測定 (2)耐水圧:JIS L1092B法に準拠して測定 (3)引っ張り強度及び伸度:JIS P8113に準
拠して測定 (4)ヒートシール性:多孔性シートをポリエチレン−
ポリプロピレン複合繊維からなる坪量20g/m2 の不
織布を重ね合わせ、その端部をテスター産業(株)製の
片面加熱バーシーラー(シールバー10×30mm)を用
い、圧力2kg/cm2 、時間0.5sec、温度130℃
にてヒートシールを行った。ヒートシール後の接着強
度、熱収縮の有無、ピンホールの有無を測定し、以下の
基準に従って、ヒートシール性を判定した。 ・全てが良好なサンプル・・・・・・・・・・・○ ・やや熱収縮は認められたサンプル・・・・・・△ ・接着力が弱く、熱収縮が大きいサンプル・・・×(Evaluation criteria) (1) Moisture permeability: Measured according to JIS ZO208 (2) Water pressure resistance: Measured according to JIS L1092B method (3) Tensile strength and elongation: Measured according to JIS P8113 (4) Heat sealability: The porous sheet is made of polyethylene-
A nonwoven fabric having a basis weight of 20 g / m 2 made of a polypropylene composite fiber is overlaid, and the end of the nonwoven fabric is heated using a one-sided heating bar sealer (seal bar 10 × 30 mm) manufactured by Tester Sangyo Co., Ltd. at a pressure of 2 kg / cm 2 and a time of 0 hours. .5 sec, temperature 130 ° C
Was heat sealed. The adhesive strength after heat sealing, the presence or absence of heat shrinkage, and the presence or absence of pinholes were measured, and the heat sealability was determined according to the following criteria.・ Samples with good quality ・ ・ ・ ○ ・ Samples with slight heat shrinkage ・ ・ ・ ・ ・ ・ ・ Samples with low adhesive strength and large heat shrinkage ×
【0029】(5)テープ接着性:多孔性シートに20
μmの厚みでホットメルト接着剤を塗布(20mm幅×1
50mm長さ)し、これを綿金布と重ね合わせ5kgのロー
ラーで1往復することにより圧着したものをテストサン
プルとする。このサンプルにおいて綿金布を多孔性シー
トから剥がした際の粘着剤の綿金布への移行を下記の基
準で判定し、シートのテープ接着性とした。 ・粘着剤の移行が全く認められない・・・・・・○ ・粘着剤の移行が一部認められる・・・・・・・△ ・粘着剤の大部分が移行する・・・・・・・・・×(5) Tape adhesion: 20 on the porous sheet
Apply a hot melt adhesive with a thickness of μm (20 mm width x 1
50 mm in length), and this was superimposed on a cotton gold cloth and reciprocated once with a 5 kg roller to obtain a test sample. In this sample, the transfer of the pressure-sensitive adhesive to the cotton fabric when the cotton fabric was peeled from the porous sheet was determined according to the following criteria, and the tape adhesiveness of the sheet was determined.・ No migration of adhesive is observed at all ・ ・ ・ ○ ・ Partial migration of adhesive is observed ・ ・ ・ ・ ・ ・ ・ ・ Most of the adhesive migrates ・ ・ ・ ・ ・ ・... ×
【0030】(6)ムレ度:表 面材としてポリエチレン−ポリプロピレン複合繊維か
らなる坪量20g/m2 の不織布を、吸収体として坪量
260g/m2 からなる綿状パルプ、裏面材として多孔
性シートを用い、図1の如く生理用ナプキンを構成す
る。このサンプルを10人のモニターにて装着してもら
い、以下の基準でムレ度を評価した。 ・ムレが全く無くさわやかな感じ・・・・・・・○ ・ややムレがある・・・・・・・・・・・・・・△ ・非常にムレる・・・・・・・・・・・・・・・× 上記基準によって得られた多孔性シートの物性を一括し
て〔表1〕に示した。[0030] (6) stuffiness index: polyethylene as a table surface material - polypropylene basis weight 20 g / m 2 of non-woven fabric made of composite fibers, cotton-like pulp consisting of basis weight 260 g / m 2 as an absorber, porous as backsheet A sanitary napkin is constructed using the sheet as shown in FIG. This sample was worn by 10 monitors, and the degree of stuffiness was evaluated according to the following criteria.・ Refreshing feeling without any stuffiness ・ ・ ・ ・ ○ ・ Some stuffiness ・ ・ ・ ・ ・ ・ ・ Very stuffy ・ ・ ・ ・ ・ ・ ・ ・ ・... ×× Physical properties of the porous sheet obtained according to the above criteria are collectively shown in [Table 1].
【0031】[0031]
【表1】 [Table 1]
【0032】又、前記実施例、比較例の多孔性シートを
用い図1に示す構成で生理用ナプキンを製造したとこ
ろ、従来の裏面材(低密度ポリエチレンラミネート紙)
に比してムレがなく、ソフトでドライ感があり、比較例
の裏面材よりヒートシール性、ホットメルト接着性、テ
ープ接着性、シート強度に優れ、快適な装着性があっ
た。Further, when a sanitary napkin was manufactured using the porous sheets of the above Examples and Comparative Examples with the structure shown in FIG. 1, a conventional backing material (low-density polyethylene laminated paper) was obtained.
Compared with Comparative Example, the back material of the comparative example was excellent in heat sealability, hot melt adhesiveness, tape adhesiveness, and sheet strength, and had a comfortable mounting property.
【0033】[0033]
【発明の効果】本発明の多孔性シートは、シート強度及
びシール性に優れ、且つ透湿性、耐水圧性等がある。ま
た、このような多孔性シートを裏面材に用いた吸収性物
品は、吸収した体液を漏らさず気化放出して、ムレるこ
とが無く、快適な装着感を与える。The porous sheet of the present invention has excellent sheet strength and sealing properties, and has moisture permeability, water pressure resistance and the like. In addition, an absorbent article using such a porous sheet as a back material vaporizes and releases the absorbed body fluid without leaking, and provides a comfortable fit without stuffiness.
【図1】本発明に係る多孔性シートを用いた吸収性部の
一実施例を示し、該吸収性物品の一部切欠して示した斜
視図である。FIG. 1 is a perspective view showing one embodiment of an absorbent section using a porous sheet according to the present invention, and showing a partially cut-away portion of the absorbent article.
【図2】(a)は吸収性物品に用いられる裏面材の平面
図、図左の太い矢印はシート成形、延伸方向を示す。図
2(b)は図2(a)の裏面材のe−e線に沿う(幅方
向)断面図、図2(c)は同f−f線に沿う断面図であ
る。FIG. 2 (a) is a plan view of a backing material used for an absorbent article, and thick arrows on the left side of the drawing show sheet forming and stretching directions. 2B is a cross-sectional view (width direction) of the back material of FIG. 2A along the line ee (width direction), and FIG. 2C is a cross-sectional view along the line ff of FIG.
【図3】本発明に係る多孔性シートの製法の一実施例を
示し、図3(a)はインフレーション法による延伸前シ
ートの断面図、図3(b)は(a)の切開シート断面図
である。3 shows an embodiment of a method for producing a porous sheet according to the present invention, FIG. 3 (a) is a sectional view of a sheet before stretching by an inflation method, and FIG. 3 (b) is a sectional view of a cut sheet of FIG. 3 (a). It is.
【図4】一比較例を示し、図4(a)は組成物(a)か
らなる(単層)の多孔性域を示す平面図、図4(b)は
図4(a)のII−II線に沿う(幅方向)の断面図であ
る。FIG. 4 shows a comparative example, in which FIG. 4 (a) is a plan view showing a (single-layer) porous region made of the composition (a), and FIG. 4 (b) is II- in FIG. 4 (a). FIG. 2 is a cross-sectional view (width direction) along the line II.
1 吸収性物品 2 表面材 3 吸収体 4 裏面材 4A 組成物(a)からなる透湿性域 4B 組成物(b)からなる非透湿性域 4A’ 組成物(a)からなるシート域 4B’ 組成物(b)からなるシート域 REFERENCE SIGNS LIST 1 Absorbent article 2 Surface material 3 Absorber 4 Back material 4A Moisture permeable area composed of composition (a) 4B Non-permeable area 4A composed of composition (b) 4A 'Sheet area composed of composition (a) 4B' composition Sheet area consisting of object (b)
フロントページの続き (51)Int.Cl.7 識別記号 FI B32B 27/32 (56)参考文献 特開 昭62−249739(JP,A) 実開 昭58−96937(JP,U) 実開 昭56−81999(JP,U) (58)調査した分野(Int.Cl.7,DB名) B32B 1/00 - 35/00 A61F 13/15 - 13/84 Continuation of the front page (51) Int.Cl. 7 Identification symbol FIB32B 27/32 (56) References JP-A-62-249739 (JP, A) Japanese Utility Model 1983-96937 (JP, U) Japanese Utility Model 1988 -81999 (JP, U) (58) Field surveyed (Int. Cl. 7 , DB name) B32B 1/00-35/00 A61F 13/15-13/84
Claims (3)
填材50〜400重量部及び柔軟化剤0.1〜20重量
部よりなる組成物(a)のシート状物に、ポリオレフィ
ン系樹脂100重量部、充填材0〜40重量部及び柔軟
化剤0〜10重量部よりなる組成物(b)のシート状物
を部分的に積層させて延伸処理した多孔性シートであっ
て、該延伸処理によって上記組成物(a)で形成される
透湿性シートの単層シート域と、該透湿性シート及び上
記組成物(b)で形成される非透湿性又は低透湿性シー
トが多層となった多層シート域とを交互に且つ多列状に
有していることを特徴とする多孔性シート。1. A sheet of a composition (a) comprising 100 parts by weight of a polyolefin-based resin, 50 to 400 parts by weight of a filler and 0.1 to 20 parts by weight of a softening agent, 100 parts by weight of a polyolefin-based resin, A porous sheet obtained by partially laminating and stretching a sheet-like material of the composition (b) comprising 0 to 40 parts by weight of a filler and 0 to 10 parts by weight of a softening agent. Ru is formed by the object (a)
And the single layer sheet area of the moisture vapor permeable sheet in the moisture vapor permeable sheet and the composition (b) non-breathable that are formed in or low moisture permeability sheets and multi-rows alternating with multilayer sheet gamut a multilayer multi porous sheet, characterized in that it has.
であって、上記組成物(a)と、上記組成物(b)とを
共押出成形によって、上記組成物(a)に上記組成物
(b)を部分的に積層させたシート状物を成形し、該成
形シートを延伸処理することを特徴とする多孔性シート
の製造方法。2. A method for producing a porous sheet according to claim 1 wherein said composition and (a), by co-extrusion and the composition (b), the composition of the above composition (a) A method for producing a porous sheet, comprising: forming a sheet-like material obtained by partially laminating the material (b); and stretching the formed sheet.
と、これら両面材の間に配置される吸収体とからなる吸
収性物品において、請求項1記載の多孔性シートを上記
裏面材として用いることを特徴とする吸収性物品。3. An absorbent article comprising a liquid-permeable surface material, a leak-proof backing material, and an absorber disposed between the two surface materials, wherein the porous sheet according to claim 1 is provided with the porous sheet. An absorbent article characterized by being used as a backing material.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16138492A JP3155351B2 (en) | 1992-06-19 | 1992-06-19 | Porous sheet and method for producing the same |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16138492A JP3155351B2 (en) | 1992-06-19 | 1992-06-19 | Porous sheet and method for producing the same |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH06910A JPH06910A (en) | 1994-01-11 |
JP3155351B2 true JP3155351B2 (en) | 2001-04-09 |
Family
ID=15734071
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16138492A Expired - Fee Related JP3155351B2 (en) | 1992-06-19 | 1992-06-19 | Porous sheet and method for producing the same |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3155351B2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10195092B2 (en) | 2014-03-06 | 2019-02-05 | The Procter & Gamble Company | Multi-component topsheets |
US10206826B2 (en) | 2014-03-06 | 2019-02-19 | The Procter & Gamble Company | Three-dimensional substrates |
US10285874B2 (en) | 2014-03-06 | 2019-05-14 | The Procter & Gamble Company | Multi-component topsheets |
US11202723B2 (en) | 2016-07-01 | 2021-12-21 | The Procter & Gamble Company | Absorbent articles with improved topsheet dryness |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5879341A (en) * | 1996-03-29 | 1999-03-09 | Kimberly-Clark Worldwide, Inc. | Absorbent article having a breathability gradient |
AU731802B2 (en) * | 1996-03-29 | 2001-04-05 | Kimberly-Clark Worldwide, Inc. | Absorbent article having a breathability gradient |
JP3510136B2 (en) * | 1999-03-03 | 2004-03-22 | ユニ・チャーム株式会社 | Liquid impervious back sheet for body fluid treatment products |
JP3777286B2 (en) * | 2000-04-14 | 2006-05-24 | 三菱樹脂株式会社 | Laminated porous film |
EP1299061A1 (en) * | 2000-07-10 | 2003-04-09 | The Procter & Gamble Company | Absorbent article comprising microporous film with registration mark |
JP4536613B2 (en) * | 2005-07-15 | 2010-09-01 | ユニ・チャーム株式会社 | Disposable diaper provided with a backsheet and method for producing the backsheet |
-
1992
- 1992-06-19 JP JP16138492A patent/JP3155351B2/en not_active Expired - Fee Related
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10195092B2 (en) | 2014-03-06 | 2019-02-05 | The Procter & Gamble Company | Multi-component topsheets |
US10206826B2 (en) | 2014-03-06 | 2019-02-19 | The Procter & Gamble Company | Three-dimensional substrates |
US10285874B2 (en) | 2014-03-06 | 2019-05-14 | The Procter & Gamble Company | Multi-component topsheets |
US11202723B2 (en) | 2016-07-01 | 2021-12-21 | The Procter & Gamble Company | Absorbent articles with improved topsheet dryness |
Also Published As
Publication number | Publication date |
---|---|
JPH06910A (en) | 1994-01-11 |
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