TWI801507B - 複合聲學層及噪音振動聲振粗糙度產品 - Google Patents
複合聲學層及噪音振動聲振粗糙度產品 Download PDFInfo
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- TWI801507B TWI801507B TW108106079A TW108106079A TWI801507B TW I801507 B TWI801507 B TW I801507B TW 108106079 A TW108106079 A TW 108106079A TW 108106079 A TW108106079 A TW 108106079A TW I801507 B TWI801507 B TW I801507B
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- acoustic layer
- composite acoustic
- nonwoven material
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Abstract
本發明提供一種複合聲學層,其包含一第一不織材料,其由具有線性密度在2至25分德士(dtex)之範圍內的細線組成,其中該第一不織材料係一種熱黏合型不織材料;及包含一連接至該第一不織材料的第二不織材料,其中該第二不織材料係一種粗梳短纖不織物,及其中該複合聲學層具有總重量在100克/平方公尺至500克/平方公尺之範圍。
Description
本發明係關於一種聲學層,特別是用於汽車應用的聲學層。
聲學層可使用在諸如噪音振動聲振粗糙度(noise vibration harshness)(NVH)產品之產品中幫助車輛變得較安靜,例如,在汽車地板產品中,諸如簇絨式車地毯;或在儀表板系統中。
已知使用在汽車地板產品中作為聲學層的產品有微纖維不織布,諸如例如可自Freudenberg獲得的Evolon®;或氣流成網不織布。這些微纖維不織布或氣流成網不織布聲學層係放置在地毯的背面上。但是,在汽車工業中使用一層氣流成網不織布非常難以滿足吸收及絕緣的目標,更別說是超過。
但是,對改良聲學層之聲學性能及/或減低所完成的噪音振動聲振粗糙度(NVH)產品之重量仍然有需求。
本發明的目標為提供一種具有改良的聲學性能及/或能夠減低完成的噪音振動聲振粗糙度產品之重量的聲學層。
本發明之目標係由如請求項1的複合聲學層達成。
根據本發明之複合聲學層可係一種可使用在諸如噪音振動聲振粗糙度(NVH)產品之產品中的吸收聲學層,其幫助車輛變得較安靜、較輕且更經濟。如與先述技藝之厚、膨鬆的氣流成網聲學層比較,該複合聲學層可視為薄、重量輕、堅硬的聲學層。該複合聲學層具有總重量在100克/平方公尺至500克/平方公尺之範圍內。
該複合聲學層能承受住高要求的汽車製程,同時鎖定住在最後複合物部分中及/或在最後噪音振動聲振粗糙度產品中之想要的氣流阻力(AFR)/雷耳(Rayl)範圍值。該複合聲學層可獲得二種不同的雷耳範圍,例如,一種用於加工及一種用於現貨。例如,該現貨產品可具有AFR/雷耳範圍值,其目標為用於策略性放置於需要額外聲學援助的想要區域之完全覆蓋物及/或染色切片(dye cut pieces);或該用於加工的產品可係一種用於完全覆蓋物的半加工聲學層,其可承受住在汽車加工期間一起存在的冷熱溫度與加壓模塑並發展出想要的AFR/雷耳範圍值。
該複合聲學層可依汽車地板產品諸如簇絨式車地毯的製造商想要般及/或汽車製造商在儀表板系統中想要般而具有雷耳值在300雷耳至7500雷耳之範圍 內,較佳為500雷耳至5500雷耳。該雷耳值係特徵聲阻抗,其中1雷耳等於1巴斯卡‧秒/公尺。
該用於策略性放置於需要額外聲學援助的想要區域之完全覆蓋物及/或染色切片的現貨產品之複合聲學層可具有雷耳值在500雷耳至5500雷耳之範圍內,較佳為3500雷耳至5500雷耳。
該用於半加工的複合聲學層之複合聲學層可具有雷耳值在300雷耳至1500雷耳之範圍內,較佳為500雷耳至1200雷耳,其可在冷熱溫度與加壓模塑一起存在的汽車加工期間發展成3700雷耳至5500雷耳之範圍。根據本發明的複合聲學層可使用在冷熱溫度與加壓模塑一起存在的汽車加工期間所遭遇到之條件而於噪音振動聲振粗糙度(NVH)產品中獲得雷耳值在3700雷耳至5500雷耳之範圍內。
該複合聲學層能夠讓該噪音振動聲振粗糙度(NVH)產品達成減少至少10dB,較佳為至少20dB,如根據ASTM E1050藉由阻抗管測量而測定。
該複合聲學層包含一第一不織材料,其由具有線性密度在2至50分德士之範圍的細線組成,其中該第一不織材料係一種熱黏合型不織材料;並包含與該第一不織材料連接的第二不織材料,其中該第二不織材料係一種粗梳短纖不織物,其能夠讓該複合聲學層具有想要的氣流阻力(AFR)或雷耳範圍而保證包含該複合聲學層的噪音振動聲振粗糙度(NVH)產品之聲學性能,同時能夠讓該噪音振動聲振粗糙度產品具有相當低的重量。
該複合聲學層可視為聲音屏障解耦器及可使用在例如汽車領域中、在商業或住宅地板中及在可想要噪音衰減的其它建築產品中。
該複合聲學層提供優異的吸收性能及適當的聲音穿透損失(STL)性能,如較佳為根據ASTM E90測定。
該複合聲學層包含至少一種第一不織材料,其由具有線性密度在5至50分德士之範圍的細線組成,其中該第一不織材料係一種熱黏合型不織材料;並包含與該第一不織材料連接之第二不織材料,其中該第二不織材料係一種粗梳短纖不織物,及其中該複合聲學層具有總重量在100克/平方公尺至500克/平方公尺之範圍內。
該第一不織材料較佳為由具有線性密度在5至25分德士之範圍的細線組成,較佳範圍為6至20分德士,更佳範圍為7至15分德士,因此能夠讓該第一不織材料具有相當高的表面開放度,此允許該複合聲學層的第一不織材料當附著至本色地毯(greige carpet)的背側,即,絨頭紗線被簇絨化進其中的主地毯背襯時,或當附著至其它基材諸如例如氣流成網不織布、針刺不織布、頂級乙烯系地磚(luxury vinyl tiles)或牆壁或天花板鑲板的背側時,該複合聲學層的第一不織材料會被聚合物塗佈物例如包含或由聚乙烯組成的塗佈物滲入,同時保留一些多孔洞性,以讓包含該複合聲學層的最後噪音振動聲振粗糙度(NVH)產品例如簇絨式地毯達到想要的氣流阻力(AFR)或雷耳範圍。已經觀察到由具有線性密度 少於5分德士的細線組成之不織材料,當其由聚合物塗佈物滲入時會完全被封閉(幾乎),此會將氣流阻力增加至非常高的程度,此將使得該第一不織材料不合適於使用在意欲目的之噪音振動聲振粗糙度(NVH)產品中。
當該第一不織材料被聚合物塗佈物滲入時,保留在該複合聲學層中之多孔洞性足以對傳播進該複合聲學層中的聲音提供充滿曲折的路徑及讓其變成在該複合聲學層中被吸收及逸散。根據本發明之複合聲學層提供多層的、薄的、重量輕、可加工的聲學材料,其可承受住在汽車加工中的溫度及壓力而獲得噪音振動聲振粗糙度(NVH)產品,諸如輕重量地板產品、儀表板及行李箱系統。
當該第一不織材料被聚合物塗佈物滲入時,保留在該複合聲學層中的多孔洞性足夠低而能防止聲音正好穿越該聲學層。例如,可進入車輛中之來自車輛外部而通過窗戶密封條、引擎及輪子噪音的聲音,或可存在於車輛內部來自對話、收音機及其類似來源的聲音。這些聲音可由硬表面如玻璃窗戶、儀表板及門塑料反射。當地板系統係非常多孔時,聲音將正好穿越該地板系統直到該聲音碰到金屬車盤及再次經由該地板系統反射回車輛的座艙中,此將對車輛座艙中的聲學有害。
該複合聲學層亦可有利地與其它基材諸如例如氣流成網不織布、針刺不織布、頂級乙烯系地磚、牆壁或天花板鑲板、壁紙、或其它地板、牆壁或天花板產品組合著使用。
雖然該複合聲學層的第一不織材料之氣流阻力(AFR)/雷耳值非常低,例如,少於100雷耳,由於該第一不織材料之相當高的表面開放度,該第一不織材料與第二粗梳短纖不織物之組合保證該複合聲學層具有足夠高的氣流阻力,同時避免該複合聲學層當被聚合物塗佈物滲入時被完全封閉。
該複合聲學層可包含一黏著材料,較佳為黏著粉末,其黏附至該複合聲學層的第一不織材料及/或第二不織材料,以便能夠進一步增加該複合聲學層之氣流阻力。較佳的是,包含在該複合聲學層中的黏著材料具有重量範圍10至100克/平方公尺,更佳範圍係10至50克/平方公尺,更佳範圍係12至25克/平方公尺。
該第一不織層的細線之相當高的線性密度會增加該複合聲學層之挺度,特別是,當該細線係藉由機械拉引細線而獲得高模數時,已發現此在多層吸收器/解耦器聲學層中係有利的。在具體實例中,該第一不織層之細線係雙組分芯/鞘細線,且由於在該雙組分芯/鞘細線的交叉點處之高頻熱黏合點,其進一步增加該複合聲學層之挺度。
該複合聲學層的第一不織材料係一熱黏合型不織物,其中該等細線係在細線的交叉點處黏合。較佳的是,該第一不織材料包含具有第一熔化溫度的第一聚合物及具有低於該第一熔化溫度的第二熔化溫度之第二聚合物,此允許該第一不織材料係在該第二聚合物熔化的溫度及壓力下熱黏合或至少軟化,以於細線之相交點 處,即,在細線的交叉點處形成黏合點。
該複合聲學層的第一不織材料之第一聚合物可係任何能夠抵擋在NVH產品特別是汽車簇絨式地毯加工製造期間所遭遇到的溫度之聚合物。較佳的是,該第一聚合物係聚酯,其可選自於聚對酞酸乙二酯、聚對酞酸丁二酯或聚對酞酸丙二酯;或聚醯胺,諸如例如,聚醯胺-6;或其摻合物或共聚物。較佳的是,該第一聚合物係聚對酞酸乙二酯。
該複合聲學層的第一不織材料之第二聚合物可係任何具有熔化溫度比該第一聚合物低的聚合物。較佳的是,該第二聚合物係聚醯胺或其共聚物,諸如例如,聚醯胺-6;或聚酯,諸如例如,聚對酞酸丁二酯、或其共聚物;或聚烯烴,諸如例如,聚乙烯、或聚丙烯、或其共聚物。
在具體實例中,該第一聚合物可形成第一單組分細線及該第二聚合物可形成第二單組分細線,即,該第一聚合物係包含在該第一單組分細線中及該第二聚合物係包含在該第二單組分細線中。
在另一個具體實例中,該第一聚合物可形成雙組分細線的第一組分及該第二聚合物可形成該雙組分細線的第二組分,即,該第一聚合物係包含在該雙組分細線的第一組分中及該第二聚合物係包含在該雙組分細線的第二組分中,以進一步增加該複合聲學層的斷裂強度及/或挺度。該雙組分細線可具有任何組態,包括芯/鞘雙組分細線、並列式雙組分細線、或海中之島 (islands-in-the-sea)雙組分細線。該雙組分細線較佳為芯/鞘雙組分細線。
該複合聲學層的第二不織材料係一種粗梳短纖不織物。該第二不織材料可係熱黏合型粗梳短纖不織物。當該複合聲學層的第一不織層與第二不織層二者進行熱黏合時,該複合聲學層可僅由熱塑性聚合物組成以改良該複合聲學層的再循環性。
包含在該複合聲學層中的第二不織材料較佳為由具有線性密度6分德士或較小之短纖維組成,較佳為3分德士或較小,更佳為2分德士或較小。減低包含在該複合聲學層的第二不織材料中之短纖維的線性密度能夠降低該複合聲學層在固定氣流阻力或雷耳值下之總重量。
該複合聲學層的第二不織材料之短纖維可由任何合適的材料製得,包括聚酯,諸如例如,聚對酞酸乙二酯、聚對酞酸丁二酯或聚對酞酸丙二酯;聚醯胺,諸如例如,聚醯胺-6;聚烯烴,諸如例如,聚乙烯或聚丙烯;或其摻合物或共聚物。
該複合聲學層的第二不織材料亦可包含至少二種型式的單組分短纖維之摻合物。
該複合聲學層的第二不織材料之短纖維亦可係雙組分短纖維。該雙組分短纖維可具有任何組態,包括芯/鞘雙組分短纖維、並列式雙組分短纖維或海中之島雙組分短纖維。該雙組分短纖維較佳為芯/鞘雙組分短纖維。
在具體實例中,該複合聲學層的第二不織材料之短纖維係芯/鞘雙組分短纖維。較佳的是,該芯/鞘雙組分短纖維包含聚酯芯,更佳為聚對酞酸乙二酯芯;及聚烯烴鞘,更佳為聚乙烯鞘。
該第一不織材料與第二不織材料可藉由任何合適的技術連結或連接在一起,例如,經由該第一不織材料及/或第二不織材料之聚合物透過熱黏合;藉由機械黏合,例如,藉由機械針刺;或藉由水纏結;或透過使用黏著劑。
在較佳的具體實例中,該複合聲學層之第二不織材料係藉由熱黏合或透過使用黏著劑而沒有施加機械黏合來連接至該第一不織材料,以改良該複合聲學層之機械性質,特別是,該複合聲學層的斷裂強度及/或挺度,因為機械黏合可造成該第一不織材料之細線有某些損傷。
該黏著劑可經選擇,如此該黏著劑係在汽車加工期間所遭遇到的溫度及壓力條件下熔化或至少軟化,以增加該複合聲學層之氣流阻力或雷耳值。
該黏著劑可係黏著膜、黏著網或黏著粉末,諸如聚烯烴粉末,諸如例如聚乙烯粉末。該黏著劑亦可以乳液或分散液使用接觸上膠輥或噴灑技術進行施加。較佳的是,該黏著劑係聚乙烯粉末。該黏著劑可例如具有重量約20克/平方公尺。該黏著劑可在該複合聲學層之第一不織物與第二不織物間形成一黏附層。藉由增加該黏附層的重量,可增加該複合聲學層之雷耳值。
該黏著劑可係能夠在該複合聲學層之第一不織物與第二不織物間形成黏附層的黏著膜,特別是,有孔黏著膜。藉由增加該有孔黏著膜的重量或藉由減低在該黏著膜中的孔隙尺寸及/或數目,可增加該複合聲學層之雷耳值。
該複合聲學層可包括額外層,例如包含聚烯烴膜,較佳為聚乙烯(PE)膜,其提高該複合聲學層之絕緣聲學穿透/插入損失(STL),和對該複合聲學層及/或噪音振動聲振粗糙度產品提供濕氣控制及蒸氣阻障性質。
根據本發明之複合聲學層可在相當低重量下提供足夠的聲學性能,此在汽車工業中係高度想要。該複合聲學層的重量可有利地係300克/平方公尺或較少,較佳為200克/平方公尺或較少,更佳為150克/平方公尺或較少。
較佳的是,該複合聲學層之第一不織材料具有重量在20至150克/平方公尺之範圍,更佳為25至125克/平方公尺,甚至更佳為25至100克/平方公尺,最佳範圍為40至75克/平方公尺。
較佳的是,包含在該複合聲學層中之黏著劑具有重量在10至100克/平方公尺之範圍,更佳範圍為10至50克/平方公尺,更佳範圍為12至25克/平方公尺。
較佳的是,該複合聲學層之第二不織材料具有重量在25至100克/平方公尺之範圍,更佳範圍為40至75克/平方公尺。
該複合聲學層可具有斷裂強度在機器方向上 係至少150牛頓/5公分,較佳為至少200牛頓/5公分,更佳為至少300牛頓/5公分,如根據訂定日期為1996年10月的DIN/ISO 9073-3測定。
該複合聲學層亦可具有斷裂強度在橫向機器方向上係至少150牛頓/5公分,較佳為至少200牛頓/5公分,更佳為至少300牛頓/5公分。
該複合聲學層可具有斷裂伸張率在機器方向上係至少25%,較佳為至少30%,更佳為至少35%,如根據訂定日期為1996年10月的DIN/ISO 9073-3測定。
該複合聲學層亦可具有斷裂伸張率在橫向機器方向上係至少40%,較佳為至少50%,更佳為至少60%。
該複合聲學層可具有在規定伸長率2%(LASE2)下的負載於機器方向上係至少80牛頓/5公分,較佳為至少100牛頓/5公分,更佳為至少125牛頓/5公分,如根據訂定日期為1996年10月的DIN/ISO 9073-3測定。
該複合聲學層可具有在規定伸長率2%(LASE2)下的負載於橫向機器方向上係至少50牛頓/5公分,較佳為至少60牛頓/5公分,更佳為至少75牛頓/5公分,如根據訂定日期為1996年10月的DIN/ISO 9073-3測定。
該具有較佳範圍的斷裂強度、斷裂伸張率及/或在規定伸長率2%下的負載之複合聲學層特別良好適合於滿足在汽車加工時所遭遇到的模塑製程。
該複合聲學層可與氣流成網不織布結合。但 是,與先述技藝之包含氣流成網不織布的聲學層比較,當該氣流成網不織係與根據本發明之複合聲學層結合以在噪音振動聲振粗糙度(NVH)產品中獲得類似的聲學性能時,該氣流成網不織物之重量可減少最高50%,特別在汽車地板產品中,諸如簇絨式車地毯;或在儀表板系統中。
較佳的是,將該複合聲學層配置在該氣流成網不織物與該經塗佈的地毯之背面間,以提高該地板系統的整體聲學能力,而超過或至少滿足噪音振動聲振粗糙度(NVH)產品的吸收及/或絕緣目標。
該複合聲學層亦可有利地使用在商業或住宅地板產品中作為額外或置換聲音層或解耦器來提高地板產品的插入損失及聲音吸收。
該複合聲學層亦可有利地在澆灌下使用於浮動式混凝土地板中、於牆壁或天花板鑲板中或於壁紙中。
根據本發明之複合聲學層可以相當小的厚度提供足夠的聲學性能。該複合聲學層之厚度可有利地係10毫米或較少,較佳為5毫米或較少,更佳為2.5毫米或較少,如根據訂定日期為1996年10月的DIN/ISO 9073-2測定。
實施例1
提供一具有55.2克/平方公尺的粗梳短纖不織物,其由具有線性密度2分德士及短纖維長度2英吋(5.1釐米)之芯/鞘雙組分短纖維構成。該雙組分短纖維包含50重量%由聚對酞酸乙二酯構成的芯及50重量%由聚乙烯構成的鞘。在進烘箱前,藉由二個施用器,以9.2克/平方公尺之量將聚乙烯粉末施加到該粗梳短纖不織物上。該包含PE粉末之經乾燥的粗梳短纖不織物係在烘箱的出口鉗處於溫度140℃下與一由具有線性密度15分德士的芯/鞘雙組分細線構成且具有重量50克/平方公尺之不織物結合以形成該複合聲學層,其中該芯/鞘雙組分細線包含76重量%由聚對酞酸乙二酯構成的芯及24重量%由聚醯胺-6構成的鞘。
該複合聲學層具有總平均重量114.4克/平方公尺及平均厚度0.5毫米。該複合聲學層具有平均氣流阻力(AFR)15巴斯卡‧秒/公尺,其對應390雷耳。
該複合聲學層具有平均斷裂強度在機器方向上係326牛頓/5公分及在橫向機器方向上係210牛頓/5公分;平均斷裂伸張率在機器方向上係39%及在橫向機器方向上係66%;及在規定伸長率2%下的負載於機器方向上係125牛頓/5公分及在橫向機器方向上係59牛頓/5公分。
提供一75.3克/平方公尺的粗梳短纖不織物,其由具有線性密度2分德士及短纖維長度2英吋(5.1釐米)之芯/鞘雙組分短纖維構成。該雙組分短纖維包含50重量%由聚對酞酸乙二酯構成的芯及50重量%由聚乙
烯構成的鞘。在進烘箱前,藉由二個施用器,以9.2克/平方公尺之量將聚乙烯粉末施加到該粗梳短纖不織物上。該包含PE粉末之經乾燥的粗梳短纖不織物係在烘箱的出口鉗處於溫度140℃下與一由具有線性密度15分德士的芯/鞘雙組分細線構成且具有重量50克/平方公尺之不織物結合以形成該複合聲學層,其中該芯/鞘雙組分細線包含76重量%由聚對酞酸乙二酯構成的芯及24重量%由聚醯胺-6構成的鞘。
該複合聲學層具有總平均重量134.5克/平方公尺及平均厚度0.5毫米。該複合聲學層具有平均氣流阻力23巴斯卡‧秒/公尺,其對應598雷耳。
該複合聲學層具有平均斷裂強度在機器方向上係378牛頓/5公分及在橫向機器方向上係259牛頓/5公分;平均斷裂伸張率在機器方向上係39%及在橫向機器方向上係63%;及在規定伸長率2%下的負載於機器方向上係141牛頓/5公分及在橫向機器方向上係81牛頓/5公分。
提供一75.3克/平方公尺的粗梳短纖不織物,其由具有線性密度2分德士及短纖維長度2英吋(5.1釐米)的芯/鞘雙組分短纖維構成。該雙組分短纖維包含50重量%由聚對酞酸乙二酯構成的芯及50重量%由聚乙烯構成的鞘。在進烘箱前,藉由二個施用器,以13.4克/平方公尺之量將聚乙烯粉末施加到該粗梳短纖不織物上。該包含PE粉末之經乾燥的粗梳短纖不織物係在烘箱
的出口鉗處於溫度140℃下與一由具有線性密度15分德士的芯/鞘雙組分細線構成且具有重量50克/平方公尺之不織物結合以形成該複合聲學層,其中該芯/鞘雙組分細線包含76重量%由聚對酞酸乙二酯構成的芯及24重量%由聚醯胺-6構成的鞘。
該複合聲學層具有總平均重量138.7克/平方公尺及平均厚度0.5毫米。該複合聲學層具有平均氣流阻力30巴斯卡‧秒/公尺,其對應780雷耳。
該複合聲學層具有平均斷裂強度在機器方向上係410牛頓/5公分及在橫向機器方向上係306牛頓/5公分;平均斷裂伸張率在機器方向上係42%及在橫向機器方向上係68%;及在規定伸長率2%下負載的於機器方向上係143牛頓/5公分及在橫向機器方向上係88牛頓/5公分。
提供一75.3克/平方公尺的粗梳短纖不織物,其由具有線性密度2分德士及短纖維長度2英吋(5.1釐米)之芯/鞘雙組分短纖維構成。該雙組分短纖維包含50重量%由聚對酞酸乙二酯構成的芯及50重量%由聚乙烯構成的鞘。在烘箱前,藉由二個施用器,以16.7克/平方公尺之量將聚乙烯粉末施加到該粗梳短纖不織物上。將該包含PE粉末之經乾燥的粗梳短纖不織物在烘箱的出口鉗處於溫度140℃下與一由具有線性密度15分德士的芯/鞘雙組分細線構成且具有重量50克/平方公尺之不織物結合以形成該複合聲學層,其中該芯/鞘雙組分細
線包含76重量%由聚對酞酸乙二酯構成的芯及24重量%由聚醯胺-6構成的鞘。
該複合聲學層具有總平均重量142克/平方公尺及平均厚度0.5毫米。該複合聲學層具有平均氣流阻力35巴斯卡‧秒/公尺,其對應910雷耳。
該複合聲學層具有平均斷裂強度在機器方向上係422牛頓/5公分及在橫向機器方向上係330牛頓/5公分;平均斷裂伸張率在機器方向上係39%及在橫向機器方向上係69%,及在規定伸長率2%下的負載於機器方向上係155牛頓/5公分及在橫向機器方向上係97牛頓/5公分。
提供一100.3克/平方公尺的粗梳短纖不織物,其由具有線性密度2分德士及短纖維長度2英吋(5.1釐米)的芯/鞘雙組分短纖維構成。該雙組分短纖維包含50重量%由聚對酞酸乙二酯構成的芯及50重量%由聚乙烯構成的鞘。在進烘箱前,藉由二個施用器,以16.7克/平方公尺之量將聚乙烯粉末施加到該粗梳短纖不織物上。將該包含PE粉末之經乾燥的粗梳短纖不織物在烘箱的出口鉗處於溫度140℃下與一由具有線性密度15分德士的芯/鞘雙組分細線構成且具有重量50克/平方公尺之不織物結合以形成該複合聲學層,其中該芯/鞘雙組分細線包含76重量%由聚對酞酸乙二酯構成的芯及24重量%由聚醯胺-6構成的鞘。
該複合聲學層具有總平均重量167克/平方公尺及平均厚度0.6毫米。該複合聲學層具有平均氣流阻力55巴斯卡‧秒/公尺,其對應1430雷耳。
該複合聲學層具有平均斷裂強度在機器方向上係494牛頓/5公分及在橫向機器方向上係333牛頓/5公分;平均斷裂伸張率在機器方向上係45%及在橫向機器方向上係70%;及在規定伸長率2%下的負載於機器方向上係170牛頓/5公分及在橫向機器方向上係101牛頓/5公分。
Claims (15)
- 一種複合聲學層,其包含第一不織材料,其中該第一不織材料由具有線性密度在2至50分德士(dtex)之範圍內的細線(filament)所組成,且係一種熱黏合型不織材料,並包含連接至該第一不織材料的第二不織材料,其中該第二不織材料係粗梳短纖不織物(carded staple fiber nonwoven),及其中該複合聲學層具有總重量在100克/平方公尺至500克/平方公尺之範圍內。
- 如請求項1之複合聲學層,其中該第一不織材料包含具有第一熔化溫度的第一聚合物及具有第二熔化溫度的第二聚合物,且該第二熔化溫度低於該第一熔化溫度。
- 如請求項2之複合聲學層,其中該第一聚合物係包含在第一單組分細線中及該第二聚合物係包含在第二單組分細線中。
- 如請求項2之複合聲學層,其中該第一聚合物係包含在雙組分細線的第一組分中及該第二聚合物係包含在雙組分細線的第二組分中。
- 如請求項1至4之任一項的複合聲學層,其中該複合聲學層包含黏著劑。
- 如請求項5之複合聲學層,其中該黏著劑係黏著劑粉末。
- 如請求項6之複合聲學層,其中該黏著劑粉末係聚乙烯粉末。
- 如請求項1至4之任一項的複合聲學層,其中該第二不織材料係由具有線性密度3分德士或較小的短纖維所組成之粗梳短纖不織物。
- 如請求項1至4之任一項的複合聲學層,其中該複合聲學層具有雷耳(Rayl)值在300雷耳至7500雷耳之範圍內。
- 如請求項9之複合聲學層,其中該複合聲學層具有雷耳值在3500雷耳至7500雷耳之範圍內。
- 如請求項1至4之任一項的複合聲學層,其中該複合聲學層具有厚度10毫米或較少。
- 一種噪音振動聲振粗糙度(noise vibration harshness)產品,其包含如請求項1至11之任一項的複合聲學層。
- 如請求項12之噪音振動聲振粗糙度產品,其中該複合聲學層附著至基材。
- 如請求項12之噪音振動聲振粗糙度產品,其中該噪音振動聲振粗糙度產品具有雷耳值在3700雷耳至5500雷耳之範圍內。
- 如請求項12至14之任一項的噪音振動聲振粗糙度產品,其中該噪音振動聲振粗糙度產品係簇絨式(tufted)車地毯、儀表板系統或行李箱系統。
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EP3781756B1 (en) | 2022-07-20 |
KR20200125588A (ko) | 2020-11-04 |
JP7374101B2 (ja) | 2023-11-06 |
TW201941925A (zh) | 2019-11-01 |
WO2019162849A1 (en) | 2019-08-29 |
MX2020007717A (es) | 2020-11-11 |
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