JP3110566B2 - Method for producing polypropylene-based nonwoven fabric - Google Patents
Method for producing polypropylene-based nonwoven fabricInfo
- Publication number
- JP3110566B2 JP3110566B2 JP25222992A JP25222992A JP3110566B2 JP 3110566 B2 JP3110566 B2 JP 3110566B2 JP 25222992 A JP25222992 A JP 25222992A JP 25222992 A JP25222992 A JP 25222992A JP 3110566 B2 JP3110566 B2 JP 3110566B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- nonwoven fabric
- polypropylene
- filament
- titanium oxide
- 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
- -1 polypropylene Polymers 0.000 title claims description 41
- 239000004743 Polypropylene Substances 0.000 title claims description 40
- 229920001155 polypropylene Polymers 0.000 title claims description 40
- 239000004745 nonwoven fabric Substances 0.000 title claims description 33
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 44
- 229920000642 polymer Polymers 0.000 claims description 37
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 27
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 27
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 22
- 238000001816 cooling Methods 0.000 description 12
- 239000000155 melt Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- 239000002131 composite material Substances 0.000 description 7
- 230000006835 compression Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 7
- 238000009987 spinning Methods 0.000 description 7
- 238000007664 blowing Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000002074 melt spinning Methods 0.000 description 5
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 4
- 239000005977 Ethylene Substances 0.000 description 4
- 238000000635 electron micrograph Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 229920001577 copolymer Polymers 0.000 description 3
- BXKDSDJJOVIHMX-UHFFFAOYSA-N edrophonium chloride Chemical compound [Cl-].CC[N+](C)(C)C1=CC=CC(O)=C1 BXKDSDJJOVIHMX-UHFFFAOYSA-N 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 238000004049 embossing Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920005606 polypropylene copolymer Polymers 0.000 description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 2
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 239000003484 crystal nucleating agent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 229910052751 metal Chemical class 0.000 description 1
- 239000002184 metal Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000051 modifying effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Landscapes
- Artificial Filaments (AREA)
- Nonwoven Fabrics (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は，柔軟性及び均一性が優
れ，医療衛生材用の素材として好適なポリプロピレン系
スパンボンド不織布を効率良く製造する方法に関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for efficiently producing a polypropylene spunbonded nonwoven fabric which has excellent flexibility and uniformity and is suitable as a material for medical hygiene materials.
【０００２】[0002]
【従来の技術】従来から，ポリプロピレン系スパンボン
ド不織布が知られており，この不織布は，例えば医療衛
生材用の素材として広範に用いられている。そして，こ
のような不織布の素材として採用されるポリプロピレン
系重合体は，通常，溶融紡糸時に紡出フイラメントの冷
却速度が小さく，かつフイラメント表面が平滑であるた
め，高品位の不織布を得ることが困難であった。ところ
で，多くの衣料用熱可塑性合成フイラメント糸の分野に
おいて，フイラメントの表面平滑性を改質すべく，重合
体に酸化チタンを添加して凹凸形態を付与する技術が知
られている。そこで，前記不織布分野においても，例え
ば，ポリプロピレン系重合体に対しシリカ等の無機微粉
末，脂肪族又は芳香族のカルボン酸及びこれらの無水
物，あるいはこれらの金属塩等を結晶核剤として添加
し，溶融紡糸時に紡出フイラメントの冷却速度を大きく
することが考えられる。しかしながら，この方法では，
紡糸口金からエアーサツカまでの距離を短くして製造装
置のコンパクト化を図ることはできるものの，紡出フイ
ラメントの冷却速度を十分に大きくすることはできな
い。一方，熱可塑性重合体フイルムの製造において，従
来から，重合体に炭酸カルシウム添加することが行われ
ていたが，これはいわゆる微多孔質フイルムを得ること
を目的とするものである。2. Description of the Related Art Conventionally, a polypropylene spunbonded nonwoven fabric has been known, and this nonwoven fabric has been widely used, for example, as a material for medical hygiene materials. The polypropylene polymer used as a material for such a nonwoven fabric usually has a low cooling rate of the spun filament during melt spinning and has a smooth filament surface, so that it is difficult to obtain a high-quality nonwoven fabric. Met. In the field of many thermoplastic synthetic filament yarns for apparel, there is known a technique of adding titanium oxide to a polymer to impart a texture to improve the surface smoothness of the filament. Therefore, in the field of nonwoven fabrics, for example, inorganic fine powders such as silica, aliphatic or aromatic carboxylic acids and their anhydrides, or metal salts thereof are added to a polypropylene-based polymer as a crystal nucleating agent. It is conceivable to increase the cooling rate of the spun filament during melt spinning. However, in this method,
Although the manufacturing apparatus can be made compact by shortening the distance from the spinneret to the air sucker, the cooling rate of the spun filament cannot be increased sufficiently. On the other hand, in the production of a thermoplastic polymer film, calcium carbonate has conventionally been added to the polymer, but this is intended to obtain a so-called microporous film.
【０００３】[0003]
【発明が解決しようとする課題】本発明は，前記問題を
解決し，柔軟性及び均一性が優れ，医療衛生材用の素材
として好適なポリプロピレン系スパンボンド不織布を効
率良く製造することができる方法を提供しようとするも
のである。DISCLOSURE OF THE INVENTION The present invention solves the above problems and provides a method for efficiently producing a polypropylene spunbonded nonwoven fabric which is excellent in flexibility and uniformity and is suitable as a material for medical hygiene materials. It is intended to provide.
【０００４】[0004]
【課題を解決するための手段】本発明者らは，前記問題
を解決すべく鋭意検討の結果，本発明に到達した。すな
わち，本発明は，酸化チタンを０．０５〜２．０重量％
及び炭酸カルシウムを０．５〜３．０重量％添加したポ
リプロピレン系重合体を用いてフイラメント群を溶融紡
出し，紡出されたフイラメント群をエアーサツカを用い
て引き取り，開繊した後，移動式捕集面上に捕集・堆積
させてウエブとし，次いで得られたウエブに熱圧着処理
を施すことを特徴とするポリプロピレン系不織布の製造
方法，を要旨とするものである。Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have reached the present invention. That is, in the present invention, 0.05 to 2.0% by weight of titanium oxide is used.
A filament group is melt-spun using a polypropylene-based polymer to which 0.5 to 3.0% by weight of calcium carbonate is added, and the spun filament group is taken out using an air sack, opened, and then moved. A method for producing a polypropylene-based nonwoven fabric, comprising collecting and depositing a web on a collecting surface to form a web, and then subjecting the obtained web to a thermocompression treatment.
【０００５】次に，本発明を詳細に説明する。本発明に
おけるポリプロピレン系重合体とは，９０重量％以上が
ポリプロピレンからなる重合体であり，例えば繰り返し
単位が０重量％を超え１０重量％以下のエチレンが共重
合されたポリプロピレン系共重合体であってもよい。ポ
リプロピレン系重合体の粘度は，メルトフローレートに
て１０〜１５０であるのが好ましく，得られる不織布の
特性を考慮すると特に３０〜８０であるのが好ましい。
また，ポリプロピレン系重合体の分子量分布を表すＱ値
（数平均分子量に対する重量平均分子量の比）は，溶融
紡糸性を考慮すると小さい方が好ましいが，特に限定さ
れるものではない。Next, the present invention will be described in detail. The polypropylene-based polymer in the present invention is a polymer comprising 90% by weight or more of polypropylene, for example, a polypropylene-based copolymer in which ethylene having a repeating unit of more than 0% by weight and 10% by weight or less is copolymerized. You may. The viscosity of the polypropylene polymer is preferably from 10 to 150 in terms of melt flow rate, and particularly preferably from 30 to 80 in consideration of the characteristics of the obtained nonwoven fabric.
Further, the Q value (ratio of the weight average molecular weight to the number average molecular weight) representing the molecular weight distribution of the polypropylene polymer is preferably small in consideration of the melt spinnability, but is not particularly limited.
【０００６】本発明では，前記のポリプロピレン系共重
合に対し，酸化チタンを０．０５〜２．０重量％及び炭
酸カルシウムを０．５〜３．０重量％添加する。酸化チ
タンの添加量が０．０５重量％未満であると前述した溶
融紡糸時の紡出フイラメントの冷却速度を十分に向上さ
せることができず，一方，この添加量が２．０重量％を
超えると溶融紡糸時に紡糸口金パツク内の濾過圧力が異
常に上昇して操業性を低下させるので，いずれも好まし
くない。したがって，この酸化チタンの添加量は，０．
０５〜２．０重量％，好ましくは０．１〜１．０重量％
とする。炭酸カルシウムの添加量が０．５未満である
と，前述した溶融紡糸時の紡出フイラメントの冷却速度
を十分に向上させることができず，一方，この添加量が
３．０重量％を超えると，溶融重合体の溶融粘度が増大
して紡出性が低下し，いずれも好ましくない。したがっ
て，この炭酸カルシウムの添加量は，０．５〜３．０重
量％，好ましくは１．０〜２．０重量％とする。In the present invention, 0.05 to 2.0% by weight of titanium oxide and 0.5 to 3.0% by weight of calcium carbonate are added to the polypropylene copolymer. If the addition amount of titanium oxide is less than 0.05% by weight, the cooling rate of the spun filament during the melt spinning described above cannot be sufficiently improved, while the addition amount exceeds 2.0% by weight. At the time of melt spinning, the filtration pressure in the spinneret pack rises abnormally and the operability is lowered, so neither is preferable. Therefore, the addition amount of this titanium oxide is 0.
05 to 2.0% by weight, preferably 0.1 to 1.0% by weight
And If the added amount of calcium carbonate is less than 0.5, the cooling rate of the spun filament during the melt spinning cannot be sufficiently improved, while if the added amount exceeds 3.0% by weight. However, the melt viscosity of the molten polymer increases, and the spinnability decreases. Therefore, the amount of the calcium carbonate added is 0.5 to 3.0% by weight, preferably 1.0 to 2.0% by weight.
【０００７】本発明では，前記の酸化チタンと炭酸カル
シウムが併用される。酸化チタンのみの添加では，紡出
フイラメント群の開繊性が不十分であり，目付けの均一
性に優れた不織布を得ることができず，一方，炭酸カル
シウムのみの添加では，紡出フイラメント群の開繊性は
向上するものの，得られた不織布が硬くなり，感触と風
合いが悪化する。酸化チタンと炭酸カルシウムが併用さ
れると，紡出フイラメント群の開繊性は向上し，目付け
の均一性が優れ，しかも柔軟性に富む不織布を得ること
ができるのである。本発明者らは，この理由に関し，フ
イラメントの表面がある種の改質作用を受け，表面形態
が変化するためであると考えている。図１〜３は，フイ
ラメントの側面を３０００倍に拡大撮影した電子顕微鏡
写真を示し，図１に記載のフイラメントは，酸化チタン
や炭酸カルシウムその他の添加剤が全く添加されていな
いポリプロピレン重合体からなるもの，図２に記載のフ
イラメントは，酸化チタンを１重量％添加したポリプロ
ピレン重合体からなるもの，図３に記載のフイラメント
は，酸化チタン０．５重量％及び炭酸カルシウム１重量
％を添加したポリプロピレン重合体からなるものであ
る。図１〜３から明らかなように，図１に記載のポリプ
ロピレン重合体のみからなるフイラメントでは，その表
面が極めて平滑であり，図２に記載の酸化チタンを１重
量％添加したポリプロピレン重合体からなるフイラメン
トでは，その表面に酸化チタン粒子の露出が観察され，
図３に記載の酸化チタン０．５重量％及び炭酸カルシウ
ム１重量％を添加したポリプロピレン重合体からなるフ
イラメントでは，その表面に酸化チタン粒子の露出が観
察されるとともに炭酸カルシウムにより生じたと推定さ
れる亀裂が観察される。これらの観察結果から，従来の
酸化チタンのみの添加では紡出フイラメント群の開繊性
の向上は一部であって，酸化チタンと炭酸カルシウムを
併用することにより初めて紡出フイラメント群の開繊性
が十分に向上し，目付けの均一性が優れ，しかも柔軟性
に富む不織布を得ることができるのである。In the present invention, the above-mentioned titanium oxide and calcium carbonate are used in combination. When only titanium oxide is added, the spun filament group is insufficient in opening property, and a nonwoven fabric having excellent uniformity in the basis weight cannot be obtained. On the other hand, when only calcium carbonate is added, the spun filament group cannot be obtained. Although the spreadability is improved, the obtained nonwoven fabric becomes hard, and the feel and feel are deteriorated. When titanium oxide and calcium carbonate are used in combination, the spreadability of the spun filament group is improved, the uniformity of the basis weight is excellent, and a flexible nonwoven fabric can be obtained. The present inventors believe that the reason for this is that the surface of the filament undergoes some kind of modifying action, and the surface morphology changes. 1 to 3 show electron micrographs of the side of the filament magnified 3000 times. The filament shown in FIG. 1 is made of a polypropylene polymer to which titanium oxide, calcium carbonate and other additives are not added at all. The filament shown in FIG. 2 is made of a polypropylene polymer to which 1% by weight of titanium oxide is added. The filament shown in FIG. 3 is a polypropylene to which 0.5% by weight of titanium oxide and 1% by weight of calcium carbonate are added. It consists of a polymer. As is apparent from FIGS. 1 to 3, the filament made of only the polypropylene polymer shown in FIG. 1 has an extremely smooth surface and is made of the polypropylene polymer shown in FIG. 2 to which 1% by weight of titanium oxide is added. In the filament, exposure of titanium oxide particles was observed on the surface,
In the filament shown in FIG. 3, which is made of a polypropylene polymer to which 0.5% by weight of titanium oxide and 1% by weight of calcium carbonate are added, exposure of titanium oxide particles is observed on the surface thereof, and it is presumed that it was caused by calcium carbonate. Cracks are observed. From these observations, it can be seen that the addition of titanium oxide alone partially improves the fiber opening of the spun filament group, and the combination of titanium oxide and calcium carbonate is the first time that the fiber opening of the spun filament group is improved. Thus, a nonwoven fabric having high uniformity, excellent uniformity in basis weight, and high flexibility can be obtained.
【０００８】本発明では，いわゆるスパンボンド法によ
り不織布を製造する。すなわち，前述したポリプロピレ
ン系重合体を例えばエクストルーダ型溶融押し出し装置
を用いて溶融した後，複数の紡糸孔を有する紡糸口金か
らフイラメント群を溶融紡出し，紡出されたフイラメン
ト群を例えば環状型あるいは横型の冷却風吹き付け装置
を用いて冷却した後，エアーサツカを用いて引き取り，
コロナ放電等の手段により開繊した後，例えばコンベヤ
ーベルト等の移動式捕集面上に捕集・堆積させてウエブ
とし，次いで得られたウエブにエンボスローラ等の手段
により熱圧着処理を施すのである。In the present invention, a nonwoven fabric is manufactured by a so-called spunbond method. That is, after the above-mentioned polypropylene-based polymer is melted using, for example, an extruder-type melt extruder, a filament group is melt-spun from a spinneret having a plurality of spinning holes, and the spun filament group is, for example, an annular or horizontal type. After cooling using the cooling air blowing device of
After the fiber is opened by corona discharge or the like, it is collected and deposited on a movable collecting surface such as a conveyor belt to form a web, and then the obtained web is subjected to thermocompression treatment by means of an emboss roller or the like. is there.
【０００９】本発明では，フイラメントは，前述したよ
うに，９０重量％以上がポリプロピレンの重合体からな
るものであり，例えばプロピレンに繰り返し単位が０重
量％を超え１０重量％以下のエチレンが共重合されたポ
リプロピレン系共重合体からなるものであってもよい。
また，ポリプロピレン系重合体単独からなるものの他
に，粘度等の特性を異にする２種以上のポリプロピレン
系重合体の混合物からなるものであってもよい。さら
に，ポリプロピレンを一成分とし，エチレンが共重合さ
れたポリプロピレン系共重合体を他成分とする複合フイ
ラメントであってもよい。なお，複合フイラメントの複
合形態としては，偏心的あるいは貼り合わせ型が挙げら
れる。特に，貼り合わせ型の複合フイラメントとする
と，熱処理によりスパイラル捲縮が発現するので，不織
布としたときに伸縮性を発現させることができる。本発
明では，前述したポリプロピレン系重合体からなるフイ
ラメントは，その形態が特に限定されるものではなく，
例えば通常の丸型断面の他に三角型断面に代表される種
々の異型断面であってもよい。また，このフイラメント
は，その繊度が特に限定されるものではないが，製糸性
を考慮すると０．５〜１０デニール程度であるのが好ま
しい。In the present invention, as described above, the filament is composed of a polypropylene polymer at 90% by weight or more. For example, propylene having a repeating unit of more than 0% by weight and ethylene of 10% by weight or less is copolymerized. It may be made of a polypropylene-based copolymer.
Further, in addition to the polypropylene polymer alone, it may be a mixture of two or more types of polypropylene polymers having different properties such as viscosity. Further, a composite filament containing polypropylene as one component and a polypropylene-based copolymer obtained by copolymerizing ethylene as another component may be used. In addition, as a composite form of the composite filament, an eccentric or bonded type is cited. In particular, in the case of a laminated composite filament, since heat treatment causes spiral crimping, it is possible to exhibit elasticity when forming a nonwoven fabric. In the present invention, the filament made of the above-mentioned polypropylene-based polymer is not particularly limited in its form.
For example, various irregular cross-sections represented by a triangular cross-section in addition to a normal round cross-section may be used. The fineness of the filament is not particularly limited, but is preferably about 0.5 to 10 denier in consideration of the spinning property.
【００１０】[0010]
【実施例】次に，実施例に基づき本発明を具体的に説明
するが，本発明は，これらの実施例によって何ら限定さ
れるものではない。実施例において，各特性値の測定あ
るいは評価を次の方法により実施した。 メルトフローレート：ＡＳＴＭ−Ｄ−１２３８（Ｌ）に
記載の方法に準じて測定した。 引張強力（ｋｇ）及び引張伸度（％）：ＪＩＳ−Ｌ−１
０９６Ａに記載の方法に準じて測定した。すなわち，試
料長が１０ｃｍ，試料幅が５ｃｍの試料片複数点を作成
し，各試料片毎に不織布の経方向及び緯方向について，
定速伸長型引張試験機（東洋ボールドウイン社製テンシ
ロンＵＴＭ−４−１−１００）を用い，引張速度１０ｃ
ｍ／分で伸長し，得られた切断時荷重値（ｋｇ）の平均
値を引張強力（ｋｇ），切断時伸長率（％）の平均値を
引張伸度（％）とした。 ＫＳ強力（ｋｇ）：不織布試料片の引張強力（ｋｇ）及
び目付け（ｇ／ｍ2 ）から，不織布のＫＳ強力（ｋｇ）
すなわち目付け１００ｇ／ｍ2 当たりの引張強力を算出
した。すなわち，不織布の経方向及び緯方向について，
引張強力値（ｋｇ）を目付け値（ｇ／ｍ2 ）で除し，さ
らに１００（ｇ／ｍ2 ）を乗じ，得られた値をＫＳ強力
（ｋｇ）とした。 嵩密度（ｇ／ｃｍ3 ）：試料長が１０ｃｍ，試料幅が１
０ｃｍの試料片５点を作成し，各試料片毎に厚さ測定器
（大栄科学精機製作所製厚さ測定器）を用い，４．５ｇ
／ｃｍ2 の荷重を印加し，この状態で１０秒間経過した
後の厚さ（ｍｍ）を測定し，この測定値を目付け値（ｇ
／ｍ2 ）で除し，，さらに１０００を乗じ，得られた値
の平均値を嵩密度（ｇ／ｃｍ3 ）とした。 伸長弾性率（％）：ＪＩＳ−Ｌ−１０９６Ａに記載のス
トリツプ法に準じて測定した。すなわち，試料長が１０
ｃｍ，試料幅が２．５ｃｍの試料片複数点を作成し，各
試料片毎に不織布の経方向及び緯方向について，定速伸
長型引張試験機（東洋ボールドウイン社製テンシロンＵ
ＴＭ−４−１−１００）を用い，初荷重を印加した後，
引張速度１０ｃｍ／で伸長し，伸長率３０％時の長さＬ
1 （ｍｍ）を測定し，１分間放置の後に除重し，３分間
経過後に再度初荷重を印加して長さＬ2 （ｍｍ）を測定
し，得られたＬ1 及びＬ2 から次式（１）により算出し
た値の平均値を伸長弾性率（％）とした。 伸長弾性率（％）＝〔（Ｌ2 −Ｌ1 ）／Ｌ2 〕×１００ ・・・・・（１） 圧縮剛軟度（ｇ）：試料長（緯方向）が１０ｃｍ，試料
幅（経方向）が５ｃｍの試料片５点を準備し，各試料片
毎に緯方向に曲げて円筒体状にし，その端部を接合して
剛軟度測定試料とした。次に，この剛軟度測定試料毎に
円筒体の軸方向について，定速伸長型引張試験機（東洋
ボールドウイン社製テンシロンＵＴＭ−４−１−１０
０）を用い，圧縮速度５ｃｍ／で圧縮し，その際の最大
荷重の応力を求め，得られた値の平均値を圧縮剛軟度
（ｇ）とした。 紡糸性：紡糸時間３０分間当たりのフイラメント切れ発
生回数により，次の３段階で紡糸性を評価した。 ○：１回以下，△：２〜５回，×：６回以上 目付けの均一性：透過光の下での目視観察により，次の
４段階評価で目付けの均一性を評価した。 ◎：特に良い，○：良い，△：やや悪い，×：悪いEXAMPLES Next, the present invention will be specifically described based on examples, but the present invention is not limited to these examples. In the examples, measurement or evaluation of each characteristic value was performed by the following method. Melt flow rate: Measured according to the method described in ASTM-D-1238 (L). Tensile strength (kg) and tensile elongation (%): JIS-L-1
The measurement was carried out according to the method described in No. 096A. That is, a plurality of sample pieces each having a sample length of 10 cm and a sample width of 5 cm were prepared, and for each sample piece,
Using a constant-speed extension type tensile tester (Tensilon UTM-4-1-100 manufactured by Toyo Baldwin Co., Ltd.), a tensile speed of 10 c
The film was stretched at m / min, and the obtained average value of the load value at break (kg) was defined as tensile strength (kg), and the average value of the elongation rate at break (%) was defined as tensile elongation (%). KS strength (kg): From the tensile strength (kg) and basis weight (g / m 2 ) of the nonwoven fabric sample, the KS strength (kg) of the nonwoven fabric
That is, the tensile strength per unit weight of 100 g / m 2 was calculated. In other words, for the longitudinal and weft directions of the nonwoven fabric,
The tensile strength value (kg) was divided by the basis weight value (g / m 2 ) and further multiplied by 100 (g / m 2 ), and the obtained value was defined as the KS strength (kg). Bulk density (g / cm 3 ): sample length 10 cm, sample width 1
Five sample pieces of 0 cm were prepared, and each sample piece was measured for thickness using a thickness measuring instrument (Daiei Kagaku Seiki Seisakusho Co., Ltd. thickness measuring instrument), 4.5 g.
/ Cm 2 , a thickness (mm) after 10 seconds has elapsed in this state, and the measured value is used as a basis weight (g).
/ M 2 ), further multiplied by 1000, and the average of the obtained values was taken as the bulk density (g / cm 3 ). Elongation modulus (%): Measured according to the strip method described in JIS-L-1096A. That is, if the sample length is 10
cm and a sample width of 2.5 cm, and a constant-speed elongation type tensile tester (Tensilon U manufactured by Toyo Baldwin Co., Ltd.)
After applying an initial load using TM-4-1-100),
Length L at a tensile rate of 10 cm /
1 (mm) is measured, left for 1 minute and then unloaded. After 3 minutes, an initial load is applied again to measure the length L2 (mm). From the obtained L1 and L2, the following equation (1) is obtained. The average value of the values calculated by the above was defined as the elongation modulus (%). Elongation modulus (%) = [(L2−L1) / L2] × 100 (1) Compression stiffness (g): sample length (weft direction) is 10 cm, sample width (meridian direction) is Five specimens each having a size of 5 cm were prepared, and each specimen was bent in the weft direction into a cylindrical body, and the ends thereof were joined to form a rigidity measurement specimen. Next, a constant-speed elongation type tensile tester (Tensilon UTM-4-1-10 manufactured by Toyo Baldwin Co., Ltd.) was applied to each of the rigidity measurement samples in the axial direction of the cylindrical body.
0), compression was performed at a compression rate of 5 cm /, the stress at the maximum load at that time was determined, and the average of the obtained values was defined as the compression stiffness (g). Spinnability: The spinnability was evaluated in the following three stages based on the number of filament breaks per 30 minutes of spinning time. ： １: 1 time or less, Δ: 2 to 5 times, ×: 6 times or more Weight uniformity: By visual observation under transmitted light, the uniformity of the weight was evaluated by the following four-step evaluation. ◎: particularly good, ○: good, △: slightly bad, ×: bad
【００１１】実施例１〜４及び比較実施例１〜４ メルトフローレートが６５のポリプロピレン重合体に，
酸化チタンと炭酸カルシウムを表１に示す添加率で各々
添加し，常法にしたがい，スパンボンド法により不織布
を製造した。すなわち，前記ポリプロピレン重合体をエ
クストルーダ型溶融押し出し装置を用いて溶融し，溶融
重合体を孔径０．３ｍｍの紡糸孔が２１０孔配設された
紡糸口金から紡糸温度２１０℃，単孔吐出量１．３５ｇ
／分で紡出し，紡出されたフイラメント群を環状型の冷
却風吹き付け装置を用い温度が１８℃で風速が０．７ｍ
／秒の冷却風を吹き付けて冷却した後，エアーサツカを
用いて引き取り速度４１００ｍ／分で吸引・引き取り，
コロナ放電により開繊した後，コンベヤーネツトベルト
上に捕集・堆積させてウエブとした。次いで，前記得ら
れたウエブに，温度が１２５℃で圧接面積率が１４．９
％のエンボスローラを用いて熱圧着処理を施し，目付け
が２０ｇ／ｍ2 の不織布を製造した。溶融紡糸性，得ら
れた不織布の物性，圧縮剛軟度及び目付けの均一性の評
価結果を表１に示す。Examples 1-4 and Comparative Examples 1-4 A polypropylene polymer having a melt flow rate of 65
Titanium oxide and calcium carbonate were added at the addition rates shown in Table 1, respectively, and a nonwoven fabric was produced by a spunbond method according to a conventional method. That is, the polypropylene polymer is melted using an extruder-type melt extruder, and the molten polymer is spun from a spinneret provided with 210 spinning holes having a hole diameter of 0.3 mm at a spinning temperature of 210 ° C. and a single hole discharge rate of 1. 35g
/ Minute, and the spun filament group is cooled at a temperature of 18 ° C. and a wind speed of 0.7 m using an annular cooling air blowing device.
After cooling by blowing cooling air at a rate of 4100 m / min.
After opening by corona discharge, the web was collected and deposited on a conveyor net belt. Next, the obtained web was pressed at a temperature of 125 ° C. and a pressed area ratio of 14.9.
% By using an embossing roller to produce a nonwoven fabric having a basis weight of 20 g / m 2 . Table 1 shows the evaluation results of the melt spinnability, the physical properties of the obtained nonwoven fabric, the compression stiffness and the uniformity of the basis weight.
【００１２】[0012]
【表１】 [Table 1]
【００１３】表１から明らかなように，本発明の構成要
件を満足する実施例１〜４では，溶融紡糸性が優れ，得
られた不織布は柔軟性及び目付けの均一性ともに優れた
ものであった。これに対し，ポリプロピレン重合体に酸
化チタンと炭酸カルシウムともに添加されていない比較
実施例１，及びポリプロピレン重合体に酸化チタンのみ
が添加された比較実施例２では，いずれも溶融紡糸性は
良好であるものの，得られた不織布は目付けの均一性が
著しく劣るものであった。また，ポリプロピレン重合体
に炭酸カルシウムのみが添加された比較実施例３では，
溶融紡糸性，得られた不織布の柔軟性及び目付けの均一
性が劣るものであった。さらに，ポリプロピレン重合体
に酸化チタン及び炭酸カルシウムが過剰に添加された比
較実施例４では，得られた不織布の柔軟性及び目付けの
均一性は優れるものの，溶融紡糸性が著しく劣り，効率
良く不織布を製造することが困難であった。As is clear from Table 1, in Examples 1-4 satisfying the constitutional requirements of the present invention, the melt spinnability is excellent, and the obtained nonwoven fabric is excellent in both flexibility and uniformity of basis weight. Was. In contrast, Comparative Example 1 in which both titanium oxide and calcium carbonate were not added to the polypropylene polymer and Comparative Example 2 in which only titanium oxide was added to the polypropylene polymer, all showed good melt spinnability. However, the obtained nonwoven fabric was extremely poor in uniformity of the basis weight. In Comparative Example 3 in which only calcium carbonate was added to the polypropylene polymer,
The melt spinnability, the flexibility of the obtained nonwoven fabric and the uniformity of the basis weight were poor. Furthermore, in Comparative Example 4 in which titanium oxide and calcium carbonate were excessively added to the polypropylene polymer, the obtained nonwoven fabric had excellent flexibility and uniformity in the basis weight, but the melt spinnability was remarkably inferior, and the nonwoven fabric was efficiently prepared. It was difficult to manufacture.
【００１４】実施例５ メルトフローレートが５０のポリプロピレン重合体（ホ
モポリマである）とプロピレンにエチレンが５重量％共
重合されたメルトフローレートが７０のポリプロピレン
共重合体に，各々酸化チタンを０．５重量％及び炭酸カ
ルシウムを１．０重量％の添加率で各々添加した後，各
重合体を溶融し，各溶融重合体を三角断面の貼り合わせ
型複合紡糸孔が配設された紡糸口金から紡糸温度２０５
℃，各重合体の単孔吐出量０．５ｇ／分（複合比は１：
１）で紡出し，紡出されたフイラメント群を環状型の冷
却風吹き付け装置を用い冷却風を吹き付けて冷却した
後，エアーサツカを用いて引き取り速度３９００ｍ／分
で吸引・引き取り，コロナ放電により開繊した後，コン
ベヤーネツトベルト上に捕集・堆積させてウエブとし
た。次いで，前記得られたウエブに，温度が１２０℃で
圧接面積率が１０．５％のエンボスローラを用いて熱圧
着処理を施し，目付けが２０ｇ／ｍ2 の貼り合わせ型複
合フイラメントからなる不織布を製造した。製造に際
し，溶融紡糸性は良好であった。そして，得られた不織
布は，ＫＳ強力が経方向で２５．８ｋｇ，緯方向で８．
２ｋｇ，嵩密度が０．０９０ｇ／ｃｍ3 ，厚さが０．２
２２ｍｍ，３０％伸長時の伸長弾性率が７２．４％，圧
縮剛軟度が７．８ｇのものであり，また，目付けの均一
性が優れたものであった。EXAMPLE 5 A polypropylene polymer (having a homopolymer) having a melt flow rate of 50 and a polypropylene copolymer having a melt flow rate of 70 in which propylene is copolymerized with 5% by weight of ethylene are each added with titanium oxide at a melt flow rate of 70%. After adding 5% by weight and 1.0% by weight of calcium carbonate, each polymer was melted, and each molten polymer was melted from a spinneret provided with a laminated composite spinning hole having a triangular cross section. Spinning temperature 205
° C, single-hole discharge rate of each polymer 0.5 g / min (composite ratio is 1:
The group of filaments spun and spun in 1) is cooled by blowing cooling air using a ring-shaped cooling air blowing device, and then suctioned and drawn at a drawing speed of 3900 m / min using an air sucker, and opened by corona discharge. After that, the web was collected and accumulated on a conveyor net belt. Next, the obtained web is subjected to thermocompression bonding using an embossing roller having a temperature of 120 ° C. and a pressed area ratio of 10.5%, and a nonwoven fabric made of a bonded composite filament having a basis weight of 20 g / m 2 is obtained. Manufactured. During production, the melt spinnability was good. The resulting nonwoven fabric has a KS strength of 25.8 kg in the warp direction and 8.8 in the weft direction.
2 kg, bulk density 0.090 g / cm 3 , thickness 0.2
The elongation modulus at 22 mm and 30% elongation was 72.4%, the compression stiffness was 7.8 g, and the uniformity of the basis weight was excellent.
【００１５】次に，前記不織布に温度１３５℃で乾熱処
理を施したところ，熱収縮により目付けが２１．２ｇ／
ｍ2 となったが，ＫＳ強力が経方向で２３．６ｋｇ，緯
方向で７．５ｋｇ，嵩密度が０．０３７ｇ／ｃｍ3 ，厚
さが０．５６７ｍｍ，３０％伸長時の伸長弾性率が８
８．４％，圧縮剛軟度が３．２ｇで，極めて柔軟性と伸
縮性に富み，目付けの均一性が優れた不織布を得ること
ができた。Next, when the nonwoven fabric was subjected to a dry heat treatment at a temperature of 135 ° C., the basis weight was 21.2 g / d by heat shrinkage.
became a m 2, KS 23.6 kg powerful is the warp direction, 7.5 kg in the weft direction, a bulk density of 0.037 g / cm 3, a thickness of 0.567Mm, elongation elastic modulus at 30% elongation 8
The nonwoven fabric was 8.4%, had a compression bristles of 3.2 g, and was extremely rich in flexibility and elasticity, and was excellent in uniformity in basis weight.
【００１６】[0016]
【発明の効果】本発明は，酸化チタン及び炭酸カルシウ
ムを各々特定添加率で添加したポリプロピレン系重合体
を用いてフイラメント群を溶融紡出し，紡出されたフイ
ラメント群を引き取り，開繊・捕集・堆積させた後，熱
圧着処理を施すというものであり，本発明によれば，柔
軟性及び目付けの均一性が優れ，医療衛生材用の素材と
して好適なポリプロピレン系スパンボンド不織布を効率
良く製造することができる。According to the present invention, a filament group is melt-spun using a polypropylene-based polymer to which titanium oxide and calcium carbonate are respectively added at specific addition rates, and the spun filament group is taken out and opened and collected. According to the present invention, a spunbonded polypropylene nonwoven fabric having excellent flexibility and uniformity in weight and suitable as a material for medical hygiene materials is efficiently produced according to the present invention. can do.
【図１】酸化チタンや炭酸カルシウムその他の添加剤が
全く添加されていないポリプロピレン重合体からなるフ
イラメントの側面を３０００倍に拡大撮影した電子顕微
鏡写真である。FIG. 1 is an electron micrograph of a side view of a filament made of a polypropylene polymer to which titanium oxide, calcium carbonate, and other additives are not added at all, at 3000 times magnification.
【図２】酸化チタンを１重量％添加したポリプロピレン
重合体からなるフイラメントの側面を３０００倍に拡大
撮影した電子顕微鏡写真である。FIG. 2 is an electron micrograph of a side view of a filament made of a polypropylene polymer to which 1% by weight of titanium oxide is added, which is photographed at a magnification of 3000 times.
【図３】酸化チタン０．５重量％及び炭酸カルシウム１
重量％を添加したポリプロピレン重合体からなるフイラ
メントの側面を３０００倍に拡大撮影した電子顕微鏡写
真である。FIG. 3 0.5% by weight of titanium oxide and calcium carbonate 1
3 is an electron micrograph of a side view of a filament made of a polypropylene polymer to which weight% has been added, which is magnified 3000 times.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) H04H 1/00 - 18/00 D01F 6/46 D01F 8/06 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 7 , DB name) H04H 1/00-18/00 D01F 6/46 D01F 8/06
Claims (1)
び炭酸カルシウムを０．５〜３．０重量％添加したポリ
プロピレン系重合体を用いてフイラメント群を溶融紡出
し，紡出されたフイラメント群をエアーサツカを用いて
引き取り，開繊した後，移動式捕集面上に捕集・堆積さ
せてウエブとし，次いで得られたウエブに熱圧着処理を
施すことを特徴とするポリプロピレン系不織布の製造方
法。1. A filament group is melt-spun using a polypropylene-based polymer to which 0.05 to 2.0% by weight of titanium oxide and 0.5 to 3.0% by weight of calcium carbonate are added. A filament-based nonwoven fabric characterized in that the filament group is taken out using an air filter, opened, collected and deposited on a movable collection surface to form a web, and then the obtained web is subjected to a thermocompression treatment. Production method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25222992A JP3110566B2 (en) | 1992-08-26 | 1992-08-26 | Method for producing polypropylene-based nonwoven fabric |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25222992A JP3110566B2 (en) | 1992-08-26 | 1992-08-26 | Method for producing polypropylene-based nonwoven fabric |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06184905A JPH06184905A (en) | 1994-07-05 |
| JP3110566B2 true JP3110566B2 (en) | 2000-11-20 |
Family
ID=17234316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25222992A Expired - Fee Related JP3110566B2 (en) | 1992-08-26 | 1992-08-26 | Method for producing polypropylene-based nonwoven fabric |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3110566B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6691920B1 (en) | 1999-08-24 | 2004-02-17 | Sony Corporation | Recording and/or reproducing device and method for loading storage medium |
| JP2015016628A (en) * | 2013-07-11 | 2015-01-29 | 川上産業株式会社 | Method for manufacturing foam sheet |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997030199A1 (en) * | 1996-02-12 | 1997-08-21 | Fibervisions A/S | Particle-containing fibres |
| US6797377B1 (en) * | 1998-06-30 | 2004-09-28 | Kimberly-Clark Worldwide, Inc. | Cloth-like nonwoven webs made from thermoplastic polymers |
| KR100726581B1 (en) * | 2002-11-04 | 2007-06-11 | 도레이새한 주식회사 | Polypropylene Spunbond Nonwoven Fabric with Excellent Antistatic Properties and Manufacturing Method |
| WO2008077156A2 (en) | 2006-12-20 | 2008-06-26 | Imerys Pigments, Inc. | Spunlaid fibers comprising coated calcium carbonate, processes for their production, and nonwoven products |
| KR101155077B1 (en) * | 2008-06-16 | 2012-06-12 | 코오롱글로텍주식회사 | Hydrophobic polypropylene staple fibers with dielectric properties and method of producing the same, nonwoven made of them |
| CN104411484B (en) * | 2012-07-13 | 2017-03-08 | 宝洁公司 | Stretchable laminates for absorbent articles and methods of making the same |
| CN103319761A (en) * | 2013-05-10 | 2013-09-25 | 赵静 | Polyolefin composite material |
| US20190000158A1 (en) * | 2015-05-26 | 2019-01-03 | Kensaku Miyake | Warming tool, warming kit, method for manufacturing warming kit, and warming method using the warming kit |
| KR101906337B1 (en) * | 2016-12-29 | 2018-10-10 | 인하대학교 산학협력단 | Manufacturing method for polymer nanofiber composites fabric having improved electrical conductivity |
-
1992
- 1992-08-26 JP JP25222992A patent/JP3110566B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6691920B1 (en) | 1999-08-24 | 2004-02-17 | Sony Corporation | Recording and/or reproducing device and method for loading storage medium |
| JP2015016628A (en) * | 2013-07-11 | 2015-01-29 | 川上産業株式会社 | Method for manufacturing foam sheet |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06184905A (en) | 1994-07-05 |
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