JP6801643B2 - 積層不織布 - Google Patents
積層不織布 Download PDFInfo
- Publication number
- JP6801643B2 JP6801643B2 JP2017505397A JP2017505397A JP6801643B2 JP 6801643 B2 JP6801643 B2 JP 6801643B2 JP 2017505397 A JP2017505397 A JP 2017505397A JP 2017505397 A JP2017505397 A JP 2017505397A JP 6801643 B2 JP6801643 B2 JP 6801643B2
- Authority
- JP
- Japan
- Prior art keywords
- woven fabric
- nonwoven fabric
- laminated
- fibers
- layer
- 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.)
- Active
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- 239000004745 nonwoven fabric Substances 0.000 title claims description 235
- 239000000835 fiber Substances 0.000 claims description 154
- 229920001169 thermoplastic Polymers 0.000 claims description 32
- 239000004416 thermosoftening plastic Substances 0.000 claims description 32
- -1 polyethylene terephthalate Polymers 0.000 claims description 31
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 28
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 27
- 239000000463 material Substances 0.000 claims description 26
- 239000002121 nanofiber Substances 0.000 claims description 26
- 239000011230 binding agent Substances 0.000 claims description 21
- 230000035699 permeability Effects 0.000 claims description 13
- 239000011148 porous material Substances 0.000 claims description 13
- 239000004952 Polyamide Substances 0.000 claims description 8
- 239000011358 absorbing material Substances 0.000 claims description 8
- 229920002647 polyamide Polymers 0.000 claims description 8
- 239000006185 dispersion Substances 0.000 claims description 5
- 239000010410 layer Substances 0.000 description 85
- 238000010521 absorption reaction Methods 0.000 description 47
- 238000000034 method Methods 0.000 description 36
- 210000002615 epidermis Anatomy 0.000 description 27
- 238000002844 melting Methods 0.000 description 20
- 230000008018 melting Effects 0.000 description 20
- 238000012360 testing method Methods 0.000 description 18
- 238000010438 heat treatment Methods 0.000 description 15
- 210000003491 skin Anatomy 0.000 description 13
- 238000005304 joining Methods 0.000 description 12
- 239000000306 component Substances 0.000 description 11
- IDCBOTIENDVCBQ-UHFFFAOYSA-N TEPP Chemical compound CCOP(=O)(OCC)OP(=O)(OCC)OCC IDCBOTIENDVCBQ-UHFFFAOYSA-N 0.000 description 10
- 229920000642 polymer Polymers 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 8
- 238000009826 distribution Methods 0.000 description 8
- 239000000843 powder Substances 0.000 description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 6
- 238000004080 punching Methods 0.000 description 6
- 230000014759 maintenance of location Effects 0.000 description 5
- 238000009960 carding Methods 0.000 description 4
- 239000000155 melt Substances 0.000 description 4
- 238000009987 spinning Methods 0.000 description 4
- 229920002292 Nylon 6 Polymers 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000001771 impaired effect Effects 0.000 description 3
- 238000004898 kneading Methods 0.000 description 3
- 238000010030 laminating Methods 0.000 description 3
- 229920000728 polyester Polymers 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000008358 core component Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000003063 flame retardant Substances 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000000877 morphologic effect Effects 0.000 description 2
- 229920000747 poly(lactic acid) Polymers 0.000 description 2
- 239000004626 polylactic acid Substances 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 229920002160 Celluloid Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000012510 hollow fiber Substances 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002074 melt spinning Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920001515 polyalkylene glycol Polymers 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Classifications
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- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
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- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
- D04H1/43825—Composite fibres
- D04H1/43828—Composite fibres sheath-core
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- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
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- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/022—Non-woven fabric
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- B32B5/024—Woven fabric
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- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
- B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- D—TEXTILES; PAPER
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- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
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- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
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- D10B2401/041—Heat-responsive characteristics thermoplastic; thermosetting
Landscapes
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- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Nonwoven Fabrics (AREA)
- Laminated Bodies (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Description
(1)表皮層及び基材層を有する積層不織布であり、
前記表皮層が不織布Aを有し、この不織布Aの密度が100〜500kg/m3、厚みが0.5〜2.5mm、及び、通気度が4〜40cm3/cm2/sであり、
前記基材層が不織布Bを有し、この不織布Bの目付けが200〜500g/m2、及び、厚みが5〜40mmである、積層不織布。
(2)前記不織布Bの厚みが10〜40mmである(1)の積層不織布。
(3)不織布Aには単繊維直径が1〜5000nmの熱可塑性繊維が、不織布A全体に対して20〜40質量%含まれている(1)又は(2)の積層不織布。
(4)剛軟度が300mm以下である(1)〜(3)のいずれかの積層不織布。
(5)前記不織布Aがポリアミドからなる繊維及び/又はポリエチレンテレフタレートからなる繊維を有する(1)〜(4)のいずれかの積層不織布。
(6)前記不織布Bがバインダー繊維を有し、このバインダー繊維の含有量が、前記不織布B全体に対し、10〜30質量%である(1)〜(5)のいずれかの積層不織布。
(7)(1)〜(6)のいずれかの積層不織布を有する吸音材。
表層部の不織布を倍率1200倍(日立製作所社製、走査型電子顕微鏡(以下「SEM」)S−3500NH−7100FA型)で不織布表面を観察した。
上記のSEMによる不織布表面観察の際に、前記不織布表面の写真を撮影した。この写真からナノファイバー層の部分の画像を抽出した。画像処理ソフト(WinROOF)を用いて、倍率10倍で同一写真内のお互いに隣接する30本ずつのナノファイバーの群を無作為に10箇所抽出し、計300本の単繊維直径を測定した。また、その単純平均値を求め、ナノファイバーの数平均による単繊維直径とした。
JIS L 1913(1998)6.2に基づいて測定した。
試料から300mm×300mmの試験片を、鋼製定規とかみそり刃とを用いて3枚採取した。標準状態における試験片の質量を測定して、単位面積当たりの質量を次の式によって求め、平均値を算出した。
ms=m/S
ms:単位面積当たりの質量(g/m2)
m:試験片の平均質量(g)
S:試験片の面積(m2)。
JIS L 1096 8.5.1に基づいて測定した。厚み測定器は(株)テクロック製のものを使用した。
目付/厚みの値を算出し、単位容積当たりの質量を求めた。
側面の縦方向の長さを金型定規で測定し、厚さ(mm)とした。
JIS L 1015(1999)8.5.1 A法に基づき測定した。試料に金ぐしを通し、繊維を平行に引きそろえた。これを切断台上においたラシャ紙の上に載せ、適度の力でまっすぐにはったままゲージ板を圧着し、安全かみそりなどの刃で30mmの長さに切断した。繊維を数えて300本を一組とし、その質量を量り、見掛の繊度を求めた。この見掛繊度と別に測定した平衡水分率とから、次の式によって正量繊度(dtex)を算出し、5回の平均値を求めた。
F0=D’×{(100+R0)/(100+Re)}
F0:正量繊度(dtex)
D’:見掛繊度(dtex)
R0:公定水分率(0.4)
Re:平衡水分率。
JIS L 1015(1999)8.4.1 A法に基づき測定した。試料を金ぐしで平行に引きそろえた。ペア形ソーターでステープルダイヤグラムを約25cm幅に作成した。作成の際、繊維を全部ビロード板上に配列するために、不織布をグリップでつかんで引き出す回数は、約70回とした。この上に目盛りを刻んだセルロイド板を置き、方眼紙上に図記した。この方法で図記したステープルダイヤグラムを50の繊維長群に等分し、各区分の境界及び両端の繊維長を測定し、両端繊維長の平均に49の境界繊維長を加えて50で除し、平均繊維長(mm)を算出した。
JIS L 1015(1999)8.7.1に基づき測定した。長さ30mmの紙を用意して、長さ方向の両端部から5mmのところにそれぞれ幅方向に区分線を引いた。また紙には幅方向に5mmの間隔で長さ方向に区分線を引いた。空間距離20mm、繊維を、一本ずつ長さ方向に、区分線に緩く張った状態で両端を接着剤で紙片にはり付けて固着し、区分ごとを1試料とした。試料を引張試験器のつかみに取り付け、上部つかみの近くで紙片を切断し、つかみ間隔20mm、引張速度20mm/分の速度で引っ張り、荷重(N)及び伸び(mm)を測定した。次の式により引張強さ(cN/dtex)及び伸び率(%)を算出した。
Tb=SD/F0
Tb:引張強さ(cN/dtex)
SD:破断時の荷重(cN)(ただし切断時の荷重が最大荷重より小さい場合は,最大荷重を採用する。)
F0:試料の正量繊度(dtex)
S={(E2−E1)/(L+E1)}×100
S:伸び率(%)
E1:緩み(mm)
E2:切断時の伸び(mm)(ただし切断時の荷重が最大荷重より小さい場合は,最大荷重のときの伸びを採用する。)
L:つかみ間隔(mm)。
JIS L 1096−1999 8.27.1 A法(フラジール形法)に準じて測定した。試料の異なる5か所から約20cm×20cmの試験片を採取し、フラジール形試験機を用い、円筒の一端(吸気側)に試験片を取り付けた。試験片の取り付けに際し、円筒の上に試験片を置き、試験片上から吸気部分を塞がないように均等に約98N(10kgf)の荷重を加え試験片の取り付け部におけるエアーの漏れを防止した。試験片を取り付けた後、加減抵抗器によって傾斜形気圧計が125Paの圧力を示すように吸込みファンを調整し、そのときの垂直形気圧計の示す圧力と、使用した空気孔の種類とから、試験機に付属の表によって試験片を通過する通気量(cm3/cm2/s)を求め、5枚の試験片についての平均値を算出した。
ASTM F316−86に規定される方法によって測定した。
測定装置としてはPorous Materials,Inc(米国)社製“パームポロメーター”を用い、測定試薬としてはPMI社製の“ガルヴィック”を用い、シリンダー圧力を100kPaとし、測定モードとしてはWET UP−DRY UPの条件にて測定した。
JIS A 1405:1998に拠って垂直入射吸音率を測定した。
試験装置としては、電子測器株式会社製の自動垂直入射吸音率測定器(型式10041A)を用いた。試験片を、インピーダンス管の一端に金属反射板との間に空気層がないように設置した。そして、100〜5000Hzの周波数域の音波を段階的に試験片に垂直に入射させ、その周波数の平面波について入射音響パワーに対して試験体に入っていく(すなわち戻ってこない)音響パワーの比を測定し吸音率を測定した。800、1000、及び、1250Hzでの3点の吸音率を測定し、得られた値の平均値を平均吸音率とした。
JIS L 1096(8.19.1)(2010)に規定されたA法(45°カンチレバー法)により、積層不織布の任意の方向及び上記の任意の方向に垂直な方向の剛軟度をそれぞれn=5で測定し、10個の平均値から剛軟度(mm)を求めた。
(海島構造繊維)
溶融粘度212Pa・s(262℃、剪断速度121.6sec−1)、融点220℃のポリアミド6(N6)(40質量部)と、重量平均分子量12万、溶融粘度30Pa・s(240℃、剪断速度2432sec−1)、融点170℃で光学純度99.5%以上のポリL乳酸(60質量部)とを別々に計量し、別々に下記条件の2軸押し出し混練機に供給し、220℃で混練してポリマーアロイチップを得た。
スクリュー形状:同方向完全噛合型 2条ネジ
スクリュー :直径37mm、有効長さ1670mm、L/D=45.1
混練部長さはスクリュー有効さの28%
混練部はスクリュー有効長さの1/3より吐出側に配置
途中3箇所のバックフロー部有り
ベント :2箇所。
次に海島構造繊維を60g/m2と、平均繊維長51mm、単糸繊度2.2デシテックスのポリエチレンテレフタレート短繊維(東レ(株)“テトロン”(登録商標))を60g/m2の2層構造となるようカードで開繊した後、クロスラップウエーバーでウエブとした。このウエッブに、ウォータジェットパンチ機で加工を実施し、目付が120g/m2、厚みが0.8mmの不織布を得た。
熱可塑性繊維として平均繊維長35mm、単糸維度0.8デシテックスのポリエチレンテレフタレート短繊維(東レ(株)“テトロン”(登録商標))を15質量部、平均繊維長51mm、単糸繊度6.6デシテックスの中空ポリエチレンテレフタレート短繊維(東レ(株)“テトロン”(登録商標))を15質量部、平均繊維長51mm、単糸繊度2.2デシテックスのポリエチレンテレフタレート短繊維(東レ(株)“テトロン”(登録商標))を55質量部、また、バインダー繊維として平均繊維長51mm、単糸繊度2.2デシテックスのポリエチレンテレフタレート短繊維の芯鞘複合繊維(鞘成分:低融点ポリエチレンテレフタレート(融点110℃)、芯成分:ホモポリエチレンテレフタレート(融点255℃)、鞘比率50質量%、東レ(株)“サフメット”(登録商標)T9611)を15質量部の比率で混繊した。
加熱炉から出てきた不織布Bに、先ほど作製した表皮層(不織布A)の低融点パウダーを載せた面が不織布側になるように積層し、130℃の加熱ローラーで抑えながら低融点パウダーを溶かして表皮層と基材層とが接合した積層不織布を得た。
(表皮層)
実施例1の不織布1を4枚貼り合せた以外は実施例1と同じ手法で表皮層を作製し、不織布Aを得た。不織布Aの厚みは1.6mm、密度185kg/m3、通気度16cm3/cm2/sであった。この不織布Aを表皮層とした。
実施例1と同じ不織布Bを用いた。この不織布Bを基材層とした。
実施例1と同じ接合方法で積層不織布を得た。
(表皮層)
ポリアミド6 の領域と複数のポリエチレンテレフタレートの領域とが長さ方向に連続して並ぶ割繊複合タイプの短繊維(単糸繊度3.3 デシテックス、長さ51mm)をカードで開繊した後、クロスラップウエーバーでウエブとした。このウエブに、ウォータジェットパンチ機で加工を実施し、厚みが0.5mm、密度260kg/m3 、通気度10cm3 /cm2/s、単繊維直径が1800〜2300nm、平均繊維径が2000nmの不織布Aを得た。この不織布Aを表皮層とした。
実施例1と同じ不織布Bを用いた。この不織布Bを基材層とした。
実施例1と同じ接合方法で積層不織布を得た。
(表皮層)
比較例4で用いた不織布Aに低融点パウダー5g/m2載せて、その2枚を重ね合わせて130℃の加熱ロールで貼り合せた不織布Aを得た。この不織布Aの厚みは1.0mm、密度260kg/m3、通気度5cm3/cm2/sであった。この不織布A を表皮層とした。
実施例1と同じ不織布Bを用いた。この不織布Bを基材層とした。
実施例1と同じ接合方法で積層不織布を得た。
(表皮層)
実施例1と同じ不織布Aを用いた。この不織布Aを表皮層とした。
熱可塑性繊維として平均繊維長35mm、単糸維度0.8デシテックスのポリエチレンテレフタレート短繊維(東レ(株)“テトロン”(登録商標))を15質量部、平均繊維長51mm、単糸繊度6.6デシテックスの中空ポリエチレンテレフタレート短繊維(東レ(株)“テトロン”(登録商標))を15質量部、平均繊維長51mm、単糸繊度2.2デシテックスのポリエチレンテレフタレート短繊維(東レ(株)“テトロン”(登録商標))を55質量部、また、バインダー繊維として平均繊維長51mm、単糸繊度2.2デシテックスのポリエチレンテレフタレート短繊維の芯鞘複合繊維(鞘成分:低融点ポリエチレンテレフタレート(融点110℃)、芯成分:ホモポリエチレンテレフタレート(融点255℃)、鞘比率30質量%、東レ(株)“サフメット”(登録商標)T9611)を35質量部の比率で混繊した。
加熱炉から出てきた不織布に先ほど作製した表皮層(不織布A)の低融点パウダーを載せた面が不織布面になるように設定し、130℃の加熱ローラーで抑えながら低融点パウダーを溶かして表皮層と基材層を接合した積層不織布を得た。
(表皮層)
次に海島構造繊維を180g/m2と、平均繊維長51mm、単糸繊度2.2デシテックスのポリエチレンテレフタレート短繊維(東レ(株)“テトロン”(登録商標))を180g/m2の2層構造となるようカードで開繊した後、クロスラップウエーバーでウエッブとした。このウエブに、ニードルパンチ機で加工を実施し、目付が360g/m2、厚みが0.8mmの不織布を得た。
実施例1と同じ接合方法で積層不織布を得た。
(表皮層)
市販されている単糸繊度2.2デシテックスのスパンボンド不織布( 東レ製 品番G2260−1S)を用いた。
(積層不織布)
実施例1と同じ接合方法で積層不織布を得た。
(表皮層)
実施例1の不織布1を用いた。不織布1の厚みは0.4mm、密度185kg/m3、通気度64cm3/cm2/sであった。この不織布1を、不織布Aとするとともに、表皮層とした。
実施例1と同じ不織布Bを用いた。この不織布Bを基材層とした。
実施例1と同じ接合方法で積層不織布を得た。
(表皮層)
単糸繊度2.2デシテックス、繊維長51mmのポリエチレンテレフタレート短繊維(東レ(株)“テトロン”(登録商標))をカードで開繊した後、クロスラップウエーバーでウエッブとした。このウエッブに、ニードルパンチ機で加工を実施し、厚みが2.9mm、密度69kg/m3、通気度142cm3/cm2/sの不織布Aを得た。この不織布Aを表皮層とした。
実施例1と同じ不織布Bを用いた。この不織布Bを基材層とした。
実施例1と同じ接合方法で積層不織布を得た。
(表皮層)
単糸繊度3.3デシテックス、繊維長51mmのポリエチレンテレフタレート短繊維(東レ(株)“テトロン”(登録商標))をカードで開繊した後、クロスラップウエーバーでウエッブとした。このウエッブに、ニードルパンチ機で加工を実施し、厚みが1.2mm、密度125kg/m3、通気度200cm3/cm2/sの不織布Aを得た。この不織布Aを表皮層とした。
実施例1と同じ不織布Bを用いた。この不織布Bを基材層とした。
実施例1と同じ接合方法で積層不織布を得た。
Claims (7)
- 表皮層及び基材層を有する積層不織布であり、
前記表皮層が不織布Aを有し、この不織布Aの密度が100〜500kg/m3、厚みが0.5〜2.5mm、及び、通気度が4〜40cm3/cm2/sであり、
前記基材層が不織布Bを有し、この不織布Bの目付けが200〜500g/m2、及び、厚みが5〜40mmであり、
前記不織布Aは、ナノファイバーの層とナノファイバーよりも太い繊維の層との積層体であり、
前記不織布Aは、0を超え10μm以下の孔径分散度が1〜20であり、かつ、10〜20μmの孔径分散度が15〜60である、積層不織布。 - 前記不織布Bの厚みが10〜40mmである、請求項1に記載の積層不織布。
- 不織布Aには単繊維直径が1〜5000nmの熱可塑性繊維が、不織布A全体に対して20〜40質量%含まれていることを特徴とする、請求項1又は2に記載の積層不織布。
- 剛軟度が300mm以下である、請求項1〜3のいずれかに記載の積層不織布。
- 前記不織布Aがポリアミドからなる繊維及び/又はポリエチレンテレフタレートからなる繊維を有する、請求項1〜4のいずれかに記載の積層不織布。
- 前記不織布Bがバインダー繊維を有し、このバインダー繊維の含有量が、前記不織布B全体に対し、5〜30質量%である、請求項1〜5のいずれかに記載の積層不織布。
- 請求項1〜6のいずれかに記載の積層不織布を有する、吸音材。
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