TWI746531B - 積層聚芳硫醚耐熱過濾器 - Google Patents

積層聚芳硫醚耐熱過濾器 Download PDF

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TWI746531B
TWI746531B TW106109651A TW106109651A TWI746531B TW I746531 B TWI746531 B TW I746531B TW 106109651 A TW106109651 A TW 106109651A TW 106109651 A TW106109651 A TW 106109651A TW I746531 B TWI746531 B TW I746531B
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Taiwan
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filter
polyarylene sulfide
fineness
dtex
mesh layer
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TW106109651A
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TW201801920A (zh
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森達哉
杉本武司
光永怜央
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日商東麗股份有限公司
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    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
    • B01D39/083—Filter cloth, i.e. woven, knitted or interlaced material of organic material
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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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  • Engineering & Computer Science (AREA)
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Abstract

本發明係廉價(低成本)地提供一種積層聚芳硫醚耐熱過濾器，其具有優異之粉塵剝離性能與粉塵集塵性能，並且在高溫下的剛性、耐磨耗性優異。本發明係包含複數之層的積層聚芳硫醚耐熱過濾器，該複數之層至少包含為過濾面之第1網層、與為非過濾面之第2網層，該積層聚芳硫醚耐熱過濾器係特徵為前述第1網層以第1網層整體為100重量%，而含有纖度0.5~1.2dtex的聚芳硫醚纖維30~70重量%、1.3~3.0dtex的聚芳硫醚纖維30~70重量%，且特徵為前述第2網層包含纖度1.0~4.0dtex的聚芳硫醚纖維。

Description

積層聚芳硫醚耐熱過濾器
本發明有關於一種積層聚芳硫醚耐熱過濾器，其係無損生產性而耐熱性、捕集性及過濾器壽命優異，尤其被適合地使用作為袋形過濾器。
淨化空氣之過濾器中，有內部過濾用過濾器與表面過濾用過濾器，在集塵機則使用表面過濾用過濾器。表面過濾係指在過濾器表面捕集粉塵而於過濾器表面使粉塵層形成，利用該粉塵層來不斷地捕集粉塵，若粉塵層成為某個程度之厚度，則由過濾器表面利用空氣壓來除去粉塵層，再度重複於過濾器表面使粉塵層形成之操作。
就構成用以過濾由垃圾焚化爐、煤炭鍋爐、或是金屬鼓風爐等被排出之高溫的廢氣之過濾器的纖維而言，包含使用了耐熱性及耐藥品性優異之聚苯硫醚(以下簡稱為PPS)纖維、間位芳綸(aramide)纖維、氟系纖維、聚醯亞胺纖維等之不織布的過濾器係被使用至今。其中又以PPS纖維因具有優異之耐水解性、耐酸性及耐鹼性，而被廣泛使用作為煤炭鍋爐的集塵用袋形過濾器。
對於袋形過濾器，係作為過濾器性能而要求良好的粉塵剝離性能及粉塵捕集性能。若粉塵剝離性能 惡劣，則袋形過濾器會因粉塵所致網眼阻塞，集塵機的壓力損失上升而成為問題。又，謀求一種為了使廢氣中的煤煙濃度降低，而粉塵捕集性能優異之袋形過濾器。
專利文獻1中有提案一種過濾布(過濾器)，其係作成粉塵捕集層與強度維持層的2層構造，且於粉塵捕集層使用熔噴(melt blow)了PPS的不織布。專利文獻2中有提案一種過濾布(過濾器)，其係於表面層配置了單纖維纖度為1.8d(2.0dtex)以下的PPS纖維。專利文獻3中有提案一種過濾器，其係至少包含2層的網，空氣流入面側的網包含纖維徑15μm以下的耐熱性纖維，空氣排出面側的網包含纖維徑20μm以上的耐熱性纖維。
先前技術文獻 專利文獻
專利文獻1日本特開2010-264430號公報
專利文獻2日本特開平10-165729號公報
專利文獻3日本特開2011-5860號公報
專利文獻1的過濾布(過濾器)，係的確粉塵剝離性能與粉塵集塵性能成為良好的，但是製造中需要針軋(needle punch)、熔噴、噴水衝孔(water jet punching)之各步驟，只能在特定的設備製造，而且有高成本的問題。
專利文獻2的方法係的確粉塵剝離性能、及粉塵集塵性能成為良好的，但是由於在高溫下的剛性、及耐磨耗性並不充分，而於使用時會有物理性的過濾布(過濾器)之劣化進行，發生破損等的問題。
專利文獻3的方法係的確過濾器的剛性、耐磨耗性成為良好的，但是由於過濾器的空氣排出面側之粗纖維徑纖維會纏絡至空氣流入面側，而會有無法獲得充分的粉塵剝離性能、粉塵集塵性能之類的問題。
於是，本發明之目的為廉價(低成本)地提供積層聚芳硫醚耐熱過濾器，其係用以解決上述以往技術之課題，具有優異之粉塵剝離性能與粉塵集塵性能，並且在高溫下的剛性、耐磨耗性優異。
本發明者們為了解決上述課題而進行研討的結果，發現藉由以下手段可達成，而完成了本發明。
本發明之積層聚芳硫醚耐熱過濾器係包含複數之層的積層聚芳硫醚耐熱過濾器，該複數之層至少包含為過濾面之第1網層、與為非過濾面之第2網層，其特徵為前述第1網層以第1網層整體為100重量%，而含有纖度0.5~1.2dtex的聚芳硫醚纖維30~70重量%、1.3~3.0dtex的聚芳硫醚纖維30~70重量%，且特徵為前述第2網層包含纖度1.0~4.0dtex的聚芳硫醚纖維。
若根據本發明之積層聚芳硫醚耐熱過濾器的較佳態樣，則特徵為構成前述第1網層之纖維的平均纖度X1、與構成前述第2網層之纖維的平均纖度X2滿足下述式1。
X1<X2 (式1)
若根據本發明，則可廉價(低成本)地提供一種積層聚芳硫醚耐熱過濾器，其係具有優異之粉塵剝離性能與粉塵集塵性能，並且在高溫下的剛性、耐磨耗性優異。
用以實施發明之形態
接著，針對本發明之積層聚芳硫醚耐熱過濾器(以下，有僅稱為過濾器之情形)，詳細地進行說明。
本發明之積層聚芳硫醚耐熱過濾器係包含複數之層的積層聚芳硫醚耐熱過濾器，該複數之層至少包含為過濾面之第1網層、與為非過濾面之第2網層，該積層聚芳硫醚耐熱過濾器係特徵為前述第1網層以第1網層整體為100重量%，而含有纖度0.5~1.2dtex的聚芳硫醚纖維30~70重量%、1.3~3.0dtex的聚芳硫醚纖維30~70重量%，且特徵為前述第2網層包含纖度1.0~4.0dtex的聚芳硫醚纖維。
本發明所使用之聚芳硫醚纖維，係其構成單元的90%以上為包含聚芳硫醚結構單元的纖維，聚芳硫醚結構單元係指將芳香族環與硫原子鍵結之構造作為重複單元的結構單元。能按照芳香族環之構造來選擇聚合 物。從取得之容易性、可紡性的觀點，較佳為使用鍵結於苯的對位之聚苯硫醚樹脂(PPS樹脂)。
又，於PPS樹脂中，在其聚合之過程中，有形成對苯硫醚單元、苯醚(phenylene ether)單元、苯碸(phenylene sulfone)單元、苯酮(phenylene ketone)單元、聯苯酮(biphenylene ketone)單元等之構成單元的情形，亦可含有此等構成單元10%以下。
本發明之積層聚芳硫醚耐熱過濾器包含多層構造，該多層構造係至少包含為過濾面之第1網層、為非過濾面之第2網層，且任一層皆包含前述聚芳硫醚纖維。
為了要獲得本發明之效果，前述第1網層以第1網層整體為100重量%，而含有纖度0.5~1.2dtex的聚芳硫醚纖維30~70重量%、1.3~3.0dtex的聚芳硫醚纖維30~70重量%，且第2網層包含纖度1.0~4.0dtex的聚芳硫醚纖維是重要的。
於第1網層的構成中，於規定的範圍混合纖度0.5~1.2dtex的細纖度纖維、與纖度1.3~3.0dtex的粗纖度纖維來使用是重要的。
細纖度纖維的纖度為0.5~1.2dtex。小於0.5dtex的情形，過濾器的壓力損失變高，過濾器壽命縮短之外，過濾器加工性會變差。細纖度纖維的纖度之下限係較佳為0.7dtex，進一步較佳為0.8dtex。大於1.2dtex的情形，無法獲得作為目的之粉塵剝離性能、粉塵集塵性能。細纖度纖維的纖度之上限係較佳為1.1dtex，進一步較佳為1.0dtex。
細纖度纖維的含有率，係以第1網層整體為100重量%，而為30~70重量%。細纖度纖維的含有率小於30重量%的情形，無法獲得作為目的之粉塵剝離性能、粉塵集塵性能。細纖度纖維的含有率之下限係較佳為40%，更佳為45%。在細纖度纖維的含有率大於70重量%的情形，過濾器的壓力損失變高，過濾器壽命縮短之外，過濾器加工性會變差。細纖度纖維的含有率之上限係較佳為60%，進一步較佳為55%。
粗纖度纖維的纖度為1.3~3.0dtex。粗纖度纖維的纖度小於1.3dtex的情形，過濾器加工性會變差。粗纖度纖維的纖度之下限係較佳為1.4dtex，進一步較佳為1.5dtex。粗纖度纖維的纖度大於3.0dtex的情形，無法獲得目的之粉塵剝離性能、粉塵集塵性能。粗纖度纖維的纖度之上限係較佳為2.8dtex，進一步較佳為2.6dtex。
粗纖度纖維的含有率，係以第1網層整體為100重量%，而為30~70重量%。在粗纖度纖維的含有率小於30重量%的情形，過濾器加工性會變差。粗纖度纖維的含有率之下限係較佳為35重量%，進一步較佳為40重量%。在粗纖度纖維的含有率大於70重量%的情形，無法獲得目的之粉塵剝離性能、粉塵集塵性能。粗纖度纖維的含有率之上限係較佳為60%，進一步較佳為55%。
於此等第1網層中，若為無損作為目的之性能的範圍，則亦可混合其它纖維，但從所謂耐熱性的觀 點，較佳為間位芳綸纖維、聚醯亞胺纖維等，其含有率係較佳為10%以下，進一步較佳為5%以下。氟系纖維係於處分使用過的過濾器之際無法焚化處理，所以不佳。
於第2網層中，包含纖度為1.0~4.0dtex的聚芳硫醚纖維是重要的。
第2網層係包含1.0~4.0dtex的聚芳硫醚纖維。聚芳硫醚纖維的纖度小於1.0dtex的情形，過濾器的壓力損失變高，過濾器壽命縮短之外，過濾器加工性會變差，耐磨耗性也變差。聚芳硫醚纖維的纖度之下限係較佳為1.2dtex，進一步較佳為1.4dtex。在聚芳硫醚的纖度大於4.0dtex的情形，無法獲得目的之粉塵剝離性能、粉塵集塵性能。聚芳硫醚的纖度之上限係較佳為3.3dtex，進一步較佳為2.8dtex。
聚芳硫醚纖維的纖度若為範圍內，則第2網層可使用單一纖度的纖維，亦可為異纖度纖維的混合。又，若為無損目的之效果的範圍，則亦可混合其它纖維，但從所謂耐熱性的觀點，較佳為間位芳綸纖維、聚醯亞胺纖維等，其含有率係較佳為10%以下，進一步較佳為5%以下。氟系纖維係於處分使用過的過濾器之際無法焚化處理，所以不佳。
構成第2網層的纖度，係較佳為構成前述第1網層之纖維的平均纖度X1、與構成前述第2網層之纖維的平均纖度X2滿足下述式1。亦即，較佳為相對於第1網層的平均纖度X1，第2網層的平均纖度X2較大。在平均纖度X2小於平均纖度X1的情形，會有無法獲得目 的之粉塵剝離性能、粉塵集塵性能的情形，且從過濾器的強度、耐磨耗性之類的觀點係不佳。
X1≦X2 (式1)
本發明之積層聚芳硫醚耐熱過濾器，從其過濾器強度的觀點，較佳為於第1網層與第2網層之間包含支撐層。
支撐層係較佳為使用了聚芳硫醚纖維之布帛。
從可獲得之耐熱過濾器的強度之觀點，較佳為支撐層的MD強度(縱向強度)為1000N/5cm以上，CD強度(橫向強度)為500N/5cm以上。支撐層的MD強度之更佳範圍為1050N/5cm以上，進一步較佳為1100N/5cm以上。支撐層的CD強度之更佳下限為550N/5cm，進一步較佳為600cN/5cm。
就支撐層可使用之聚芳硫醚纖維的形態而言，期望使用短纖維紡紗或複絲。尤其短纖維紡紗係與網的纏絡性良好且纖維的表面積大，所以在過濾器的粉塵捕集效率變好之點為適合的。就構成支撐層之纖維的纖度而言，並未特別限定，但若纖度過粗，則會有因紡織條件而支撐層的網眼容易阻塞的傾向，壓力損失會變高，所以不佳。相反地，若纖度過細，則雖紡織密度變低而有通氣量變高的傾向，但會有作為支撐層之強度降低的傾向，過濾器整體的機械性強度會降低，所以不佳。
就構成支撐層之纖維的總纖度而言，較佳為100~1000dtex，更佳為300~600dtex為宜。在總纖度小於100dtex的情形，會有無法充分獲得尺寸穩定性或拉伸強度之提升效果的情形。又，在總纖度大於1000dtex的情形，雖尺寸穩定性或拉伸強度優異，但會有過濾器的通氣量降低之傾向，所以會有作為過濾器的壽命縮短的可能性。
就支撐層的形態而言，從減輕作為過濾器而使用之情形的壓力損失之觀點，較佳為網眼粗的織物，就其紡織密度而言，經紗密度較佳為20~50根/2.54cm，更佳為25~40根/2.54cm，緯紗密度較佳為10~30根/2.54cm，進一步較佳為10~25根/2.54cm。就支撐層的紡織組織而言，有平紋組織、雙層組織、三層組織、斜紋組織、緞紋組織等，但尤其是以低成本且汎用的平紋組織之織物即可獲得滿足之性能，所以較佳使用其。
本發明之積層聚芳硫醚耐熱過濾器的製造方法，係可適合地使用例如：作為第1網層，而以第1網層整體為100重量%來作成包含纖度0.5~1.2dtex的聚芳硫醚纖維30~70重量%、1.3~3.0dtex的聚芳硫醚纖維30~70重量%之網，與支撐層積層之後，作為第2網層，而作成包含纖度1.0~4.0dtex的聚芳硫醚纖維之網，進一步積層於已積層前述第1網層與支撐層者之後，將此等纏絡而進行一體化的方法。
就作成網的方法而言，可適合地使用例如：將耐熱性纖維的短纖維穿過卡片機而作成網的方法。 又，就將網纏絡而進行一體化的方法而言，較佳為針軋、或噴水衝孔。
本發明之積層聚芳硫醚耐熱過濾器的厚度較佳為1.5~2.5mm。在超過此範圍的情形，會有變得難以獲得較佳表觀密度或單位重量的情形。厚度的更佳範圍為1.6~2.3mm，進一步較佳範圍為1.7~2.2mm。
本發明之積層聚芳硫醚耐熱過濾器以125Pa的靜壓使其通氣之際的通氣度，係較佳成為5cc/cm2/s以上。在通氣度小於5cc/cm2/s的情形，於作為過濾器而使用之情形會有壓力損失變高，縮短過濾器的壽命之情形。通氣度較佳為6cc/cm2/s以上，更佳為7cc/cm2/s以上。
本發明之積層聚芳硫醚耐熱過濾器的表觀密度，係較佳為0.20~0.40g/cm3。在表觀密度小於0.20的情形，會有過濾器內之纖維間的空隙過度變大，粉塵變得容易侵入過濾器內的傾向，會有過濾器壽命被縮短的可能性。表觀密度的下限更佳為0.22g/cm3，進一步較佳為0.24g/cm3。在表觀密度大於0.40的情形，會有於過濾器內的纖維間變得沒有空隙的傾向，壓力損失會變大，所以有壽命被縮短的可能性。表觀密度的上限更佳為0.38g/cm3，進一步較佳為0.36g/cm3。
積層聚芳硫醚耐熱過濾器的表觀密度，係能夠藉由該領域之知識者選擇過濾器的單位重量、或針軋的情形之刺針根數或針的支數、噴水衝孔的情形之水流的壓力或噴嘴徑、還有在實施軋光加工的情形之軋光壓力或次數之類的過濾器之製造條件，來適當調整。
本發明之積層聚芳硫醚耐熱過濾器的單位重量，若為滿足前述特徵的範圍，則未特別限定，但較佳成為400~800g/m2，更佳為500~700g/m2。在過濾器的單位重量小於400g/m2的情形，會有過濾器的強度變低之傾向。在過濾器的單位重量大於800g/m2的情形，會有過濾器的壓力損失變高，不適合作為過濾器之使用的情形。
耐熱過濾器的單位重量，係主要能夠藉由相對於過濾器加工機的線速之纖維原料的投入量、或網重疊張數來調整，即使藉由其它過濾器加工條件，該領域之知識者亦能夠進行適當調整。
本發明之積層聚芳硫醚耐熱過濾器，係可藉由使粉塵堆積的第1網層側之網表面的一部分熔接，而進一步提高粉塵剝離性能或粉塵捕集效率。就使網表面的一部分熔接之方法而言，可使用燒毛處理或鏡面加工等之方法。具體而言，係於耐熱過濾器的第1網層，進行藉由噴燃器火焰或是紅外線加熱器等的燒毛處理，或以熱輥來加壓。可利用進行相關處理而熔接第1網層之網表面的至少一部分、或阻塞網眼，藉此使粉塵捕集效率提升。
如此進行而所得之積層聚芳硫醚耐熱過濾器，係縫製成袋狀，作為被要求耐熱性之將垃圾焚化爐或煤炭鍋爐、或者金屬鼓風爐等之廢氣進行集塵的袋形過濾器，而被適合地使用。就此縫製中所使用的縫線而言，較佳為使用以具有耐熱性、耐藥品性之纖維素材所構成的線，其中又較佳為使用聚芳硫醚纖維。
[實施例]
以下，藉由實施例來進一步詳細地說明本發明，但本發明並未受限於此等。
再者，積層聚芳硫醚耐熱過濾器之各物性的測定方法，係如下所述。
<單位重量(g/m2)>
根據JIS-L1085(1998年)之方法，作成3張20cm×20cm的樣品，測定重量，求出其平均值作為每m2的質量。
<厚度(mm)>
根據JIS-L1913(2010年)之方法，由樣品取10張10cm×10cm的試驗片，於厚度測定器(前田精機製作所製的壓縮彈性試驗機)的上側圓形水平板加壓0.5kPa的壓力10秒鐘，而測定厚度，算出10張試驗片的平均值。
<表觀密度(g/cm3)>
由上述單位重量、厚度算出。
<強度(N/5cm)、延伸度(%)>
支撐層、過濾器之任一者皆根據JIS-L1085(1998年)之方法，以定速伸長型拉伸試驗機，作為試驗片5試樣的平均值而MD方向、CD方向分別算出。
<通氣度(cc/cm2/s)>
根據JIS-L1096(2010年)A法(fragile form method)，以125Pa的靜壓使其通氣，隨機地測定其通氣量10點，作為其平均值而算出。
<出口粉塵濃度(mg/m3)、循環時間(s)>
使用VDI-3926 Part I所規定的裝置，按照JIS Z 8909-1(2005)所規定的測定條件而進行集塵性能試驗。代表性之數值係如下所述。
粉塵：JIS Z 8901(2005)所規定之試驗用粉體第10種
入口粉塵濃度：5g/m3
過濾速度：2m/分
脈衝用壓縮空氣箱壓力(500kPa)
拍除壓力損失：1000Pa
脈衝噴射時間：50ms
按照JIS Z 8901-1(2005)的7.2所規定的方法，而進行濾布的陳化處理之後，對該已進行陳化‧穩定化處理的濾布進行30次拍除，從其間之通氣量與過濾器通過粉塵量來算出出口粉塵濃度。又，將前述30次拍除中之粉塵通氣時間的積算時間當成循環時間。
<過濾器加工性>
如下述地判斷對過濾器進行加工之際的步驟通過性。
S：能夠以規定的線速加工，亦無織物結構的不均勻
A：能夠以規定的線速加工。若干可見織物結構的不均勻，但對過濾器性能沒有影響
B：織物結構的不均勻多，若不降低線速就無法加工
(實施例1)
使用纖度2.2dtex、切割長度51mm的PPS短纖維(東麗(股)「TORCON®」S391-2.2T51mm)，獲得單紗支數20s、股紗條數2條的紡紗(以下為20s/2)、與單紗支數7s的紡紗(以下為7s/1)。此等紡紗之中，以20s/2為經紗，以7s/1為緯紗而作成平紋組織，獲得經紗密度30根/2.54cm、緯紗密度18根/2.54cm的PPS紡紗平紋織物。所得之織物係MD強度1330N/5cm、CD強度620N/5cm、單位重量132g/m2。將此織物作為支撐層。
將以重量比50：50混棉了纖度1.0dtex、切割長度51mm的PPS短纖維(東麗(股)「TORCON®」S301-1T51mm)與纖度2.2dtex、切割長度51mm的PPS短纖維(東麗(股)「TORCON®」)S371-2.2T51mm)之短纖維進行開棉、梳棉處理之後，以直交叉積層作成單位重量為約220g/m2的網。將此網積層於上述支撐層的單面之後，以刺針密度100根/cm2進行暫時針軋。此網層係成為第1網層，其係過濾面。
於已積層上述網之支撐層的另一面，將與第1網層相同之纖度2.2dtex、切割長度51mm的PPS短纖維(東麗(股)「TORCON®」S371-2.2T51mm)100%進行開棉、梳棉處理之後，以直交叉積層作成單位重量為約220g/m2的網。將此網積層於已積層上述網之支撐層的另一面之後，以刺針密度100根/cm2進行暫時針軋。此網層係成為第2網層，其係非過濾面。
進一步藉由針軋加工而使支撐層與上述之第1網層及第2網層交絡，獲得單位重量552g/m2、總刺針密度500根/cm2的過濾器。於表1顯示所得之過濾器的性能。
(實施例2)
除了將第1網層、及第2網層中使用之纖度2.2dtex、切割長度51mm的PPS短纖維變更為纖度1.5dtex、切割長度51mm的PPS短纖維以外，係與實施例1同樣地進行，而獲得單位重量552g/m2的過濾器。於表1顯示所得之過濾器的性能。
(實施例3)
除了將第1網層中使用之纖度1.0dtex、切割長度51mm的PPS短纖維變更為纖度0.8dtex、切割長度51mm的PPS短纖維以外，係與實施例2同樣地進行，而獲得單位重量556g/m2的過濾器。於表1顯示所得之過濾器的性能。
(比較例1)
除了將第1網層、及第2網層中使用之PPS纖維全部變更為纖度1.0dtex、切割長度51mm者以外，係與實施例1同樣地進行，而獲得單位重量554g/m2的過濾器。然而，由於在梳棉步驟中頻生棉結，而有將線速降低4成左右之必要。於表1顯示所得之過濾器的性能。
(比較例2)
除了將第1網層、及第2網層中使用之PPS纖維全部變更為纖度2.2dtex、切割長度51mm者以外，係與實施例1同樣地進行，而獲得單位重量566g/m2的過濾器。於表1顯示所得之過濾器的性能。
(比較例3)
除了將第2網層中使用的PPS纖維變更為纖度7.8dtex、切割長度51mm的PPS短纖維(東麗(股)「TORCON®」S101-7.8T51mm)以外，係與實施例1同樣地進行，而獲得單位重量575g/m2的過濾器。於表1顯示所得之過濾器的性能。
Figure 106109651-A0202-12-0016-1
在實施例1~3所得之過濾器，係顯示良好的過濾器加工性，並且，為粉塵集塵性能之指標的出口粉塵濃度、與為過濾器壽命之指標的循環時間優異。
在比較例1所得之過濾器係因僅使用細纖度纖維，而過濾器加工性變差，就過濾器性能而言，亦顯示雖為粉塵集塵性能之指標的出口粉塵濃度良好，但為過濾器壽命之指標的循環時間縮短。
在比較例2所得之過濾器係因於第1網層僅使用粗纖度纖維，而出口粉塵濃度高，且無法獲得作為目的之粉塵集塵性能。
在比較例3所得之過濾器係因於第2網層使用7.8dtex的粗纖度纖維，而出口粉塵濃度高，且無法獲得作為目的之粉塵集塵性能。認為這是第2網層的粗纖度纖維交絡至第1網層的緣故。

Claims (6)

  1. 一種積層聚芳硫醚耐熱過濾器，其係包含複數之層，而該複數之層至少包含為過濾面之第1網層、與為非過濾面之第2網層，該積層聚芳硫醚耐熱過濾器係特徵為該第1網層係以第1網層整體為100重量%，而含有纖度0.5~1.2dtex的聚芳硫醚纖維30~70重量%、1.3~1.5dtex的聚芳硫醚纖維30~70重量%，且特徵為該第2網層係由纖度1.0~1.5dtex的聚芳硫醚纖維所組成。
  2. 如請求項1之積層聚芳硫醚耐熱過濾器，其中，構成該第1網層之纖維的平均纖度X1、與構成該第2網層之纖維的平均纖度X2係滿足下述式1，X1<X2 (式1)。
  3. 如請求項1或2之積層聚芳硫醚耐熱過濾器，其中，於該第1網層與該第2網層之間包含支撐層。
  4. 如請求項3之積層聚芳硫醚耐熱過濾器，其中，該支撐層為MD強度1000N/5cm以上、CD強度500N/5cm以上的聚芳硫醚紡紗織物。
  5. 如請求項1或2之積層聚芳硫醚耐熱過濾器，其中，該積層聚芳硫醚耐熱過濾器的厚度為1.5~2.5mm，該積層聚芳硫醚耐熱過濾器整體的表觀密度為0.20~0.40g/cm3。
  6. 如請求項1或2之積層聚芳硫醚耐熱過濾器，其根據JIS-L1096(2010年)A法(fragile form method)測定之以 125Pa的靜壓使其通氣之際的通氣度為5cc/cm2/秒以上。
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