TW202330239A - 熱壓用緩衝材 - Google Patents

熱壓用緩衝材 Download PDF

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TW202330239A
TW202330239A TW111143585A TW111143585A TW202330239A TW 202330239 A TW202330239 A TW 202330239A TW 111143585 A TW111143585 A TW 111143585A TW 111143585 A TW111143585 A TW 111143585A TW 202330239 A TW202330239 A TW 202330239A
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yarn
cushioning
buffer
bulky
pressing
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河野秀平
吉田晃
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日商山內股份有限公司
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    • D06M15/244Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of halogenated hydrocarbons
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Abstract

熱壓用緩衝材10具有緩衝部1。緩衝部1包含:在經紗5a或緯紗5b的至少一方採用合撚紗之織布5、以及附著於構成織布5的纖維的表面之聚合物材料6。織布5的經紗5a或緯紗5b的至少一方採用的合撚紗係將由玻璃纖維構成的複數根膨鬆紗合撚而形成。

Description

熱壓用緩衝材
本發明係關於熱壓用緩衝材。
在製造銅箔積層板(copper clad laminate)、軟性印刷基板、多層板等之印刷基板、IC卡、液晶顯示板、陶瓷積層板、電子零件等之精密機器零件(以下統稱為「積層板」)之際,會進行加壓成型或熱壓著等之熱壓。
圖8係用來說明對印刷基板等進行加壓成型或熱壓著之加壓裝置之圖。此加壓裝置係具備相向的一對熱盤13、13。一對熱盤13、13係對印刷基板等進行加熱加壓之手段。加壓裝置用一對熱盤13、13夾住作為積層板材料之被加壓材12,並以一定的壓力及熱對其加壓。此時,為了使施加於被加壓材12之熱及壓力在整個面均勻化,會在熱盤13與被加壓材12之間插入平板狀的緩衝材11。在圖8中,還在緩衝材11與被加壓材12之間插入不銹鋼製的鏡面板14。
要求緩衝材11要具有的一般特性舉例來說有:吸收熱盤13及被加壓材12的凹凸不平之緩衝性、以使整個加壓面內的溫度及壓力均勻的方式將熱及力從熱盤13傳遞到被加壓材12之面內均勻性、有效率地將熱從熱盤13傳遞到被加壓材12之熱傳遞性、以及可耐受加壓溫度之耐熱性等。
例如,專利文獻1中揭示了一種熱壓用緩衝材,該種熱壓用緩衝材係具備纖維-橡膠複合材料層,該纖維-橡膠複合材料層係由在經紗及緯紗的至少其中一方採用由玻璃纖維構成的膨鬆紗的織布、以及滲入包含於該織布中的橡膠所構成。該熱壓用緩衝材係在纖維-橡膠複合材料層的內部形成有空隙,而能夠發揮良好的緩衝性。
[先前技術文獻]
[專利文獻]
[專利文獻1]日本特開2008-132656號公報
一般而言,熱壓用緩衝材需重復使用,所以會要求要有耐久性。專利文獻1係以噴氣(air jet)加工法進行單紗的開纖或合撚紗的膨鬆,並將具有如毛線般的膨鬆感之膨鬆紗(bulky yarn:膨體紗)用於織布,藉此提高織布的空隙率,實現良好的緩衝性。本發明的發明人大量使用噴氣加工而使其更加膨鬆,使膨鬆紗的粗度變得更粗,藉此進行提高緩衝性及耐久性之試驗。結果卻發現,在此情況,過多的噴氣加工會使玻璃纖維折斷,雖然初期的緩衝性高,但隨著使用次數增多,特性會大幅降低,熱壓用緩衝材的耐久性反倒變差了。
因此,有鑑於上述問題,本發明的目的在於,提供即使在反復使用的情況也可維持良好的緩衝性之耐久性良好的熱壓用緩衝材。
為了達成上述目的,本發明係為具有緩衝部之熱壓用緩衝材,
且前述緩衝部係包含:
在經紗或緯紗的至少一方採用合撚紗之織布;以及
附著於構成前述織布的纖維的表面之聚合物材料,
前述合撚紗係將由玻璃纖維構成的複數根膨鬆紗合撚而形成。
根據本發明,可提供即使在反復使用的情況也可維持良好的緩衝性之耐久性良好的熱壓用緩衝材。
1:緩衝部
1a:玻璃纖維紗
1b:膨鬆紗
1c:膨鬆紗複合撚紗
2:表層部
3:接著層部
4:接著片部(接著片)
5:織布
5a:經紗
5b:緯紗
6:聚合物材料
7:空隙
10、10a、10b:熱壓用緩衝材
11:緩衝材
12:被加壓材
13:熱盤
14:鏡面板
圖1係顯示實施型態之熱壓用緩衝材。
圖2係顯示通常的玻璃纖維紗。
圖3係顯示由玻璃纖維構成的膨鬆紗。
圖4係顯示將複數根膨鬆紗合撚而成的膨鬆紗複合撚紗之圖。
圖5係顯示另一實施型態之熱壓用緩衝材之圖。
圖6係顯示另一實施型態之熱壓用緩衝材之圖。
圖7係將表1畫成曲線圖而成者。
圖8係用來說明對印刷基板等進行加壓成型或熱壓著之加壓裝置之圖。
以下,參照圖式來詳細說明本發明之熱壓用緩衝材。
[本實施型態之熱壓用緩衝材]
圖1係顯示本實施型態之熱壓用緩衝材10。如圖1所示,熱壓用緩衝材10係至少具備緩衝部1。緩衝部1係由織布5以及附著於構成織布5的纖維的表面之聚合物材料6所構成,其為片狀的緩衝材料(緩衝片)。緩衝部1在內部含有空隙7。
在緩衝部1中,織布5的經紗5a或緯紗5b的至少一方係為合撚紗。合撚紗係將由玻璃纖維構成的複數根膨鬆紗(texturized yarn:捲曲變形紗)合撚而形成。以下,將這種合撚紗稱為「膨鬆紗複合撚紗」。圖1中,經紗5a為通常的玻璃纖維紗,緯紗5b為膨鬆紗複合撚紗。此外,經紗5a亦可與緯紗5b一樣為膨鬆紗複合撚紗。
在此,針對膨鬆紗及膨鬆紗複合撚紗進行說明。
圖2係顯示通常的玻璃纖維紗1a之圖,圖3係顯示由玻璃纖維構成的膨鬆紗1b之圖,圖4係顯示將複數根膨鬆紗合撚而成的膨鬆紗複合撚紗1c之圖。
圖2所示的玻璃纖維紗1a係單紗、複數根單纖維聚集成束而成的粗紡紗(roving yarn)、或將複數根單紗或粗紡紗合撚而成的紗。圖3所示的膨鬆紗1b與圖2所示的玻璃纖維紗1a不同,係構成玻璃紗之短纖維以彼此並非平行的狀態,而是以互相糾纏、紊亂的狀態相併合而成之佔有面積大的紗。換言之,膨鬆紗具有如毛線般的膨鬆,所以採用膨鬆紗的織布與通常的織布不同,內部會含有很多空隙。膨鬆紗1b因為紗體本身含有很多空隙,所以可讓聚合物材料適度地滲入包含於其中。
膨鬆紗1b係對玻璃纖維紗進行膨鬆(bulking)加工而得到的膨體紗(bulked yarn)。膨體紗係進行紗的開纖或合撚紗的膨鬆,使紗具有如毛線般的膨鬆感之加工紗。
膨鬆紗1b除了可採用膨體紗之外,亦可採用棉狀紗(staple yarn)、紗條(sliver yarn)等。棉狀紗係將綿狀的玻璃短纖維紡成紗狀而成者。紗條係將未撚過的膨鬆的短纖維(條:sliver)加以撚合而成的紗。
本實施型態之膨鬆紗1b以將1000根至15000根玻璃纖維的單纖維聚集成束而成者較佳。此係為了得到適度的緩衝性及足夠的耐久性。單纖維的根數在1500根以上更佳,在2000根以上又更佳。此外,單纖維的根數在12000根以下更佳,在10000根以下又更佳。另外,在膨鬆紗為合撚紗之情況,其撚數太少會有耐久性差之虞,太多則會有緩衝性降低之虞,因此以玻璃纖維長度每英吋合撚0.1至10次較佳,0.5至5次更佳。構成膨鬆紗之玻璃纖維的單纖維的直徑以在3至11μm較佳。此係因為單纖維的直徑未滿3μm的情況在製造上會難以加工且單纖維的必要數目很多,比11μm粗的情況則纖維會容易折斷而對特性造成不良影響。
一般的合撚紗指的是將複數根紗合撚而成者,作為本發明之合撚紗之圖4所示的膨鬆紗複合撚紗1c指的是,將複數根(圖4中為三根)圖3所示的膨鬆紗1b合撚而形成者。亦即,用於本發明之膨鬆紗複合撚紗係將複數根膨鬆紗合撚而成者,而與例如合撚紗進一步合撚最後再進行膨鬆加工而成的膨鬆紗有明確的區別。此外,為了得到良好的緩衝性及足夠的耐久性,膨鬆紗複合撚紗的單纖維的總根數以在3000根至100000根較佳。單纖維的根數在4500根以上更佳,在 6000根以上又更佳。單纖維的根數在80000根以下更佳,在60000根以下又更佳。另外,膨鬆紗複合撚紗的撚數可設定為例如膨鬆紗長度每英吋合撚1至4次。
要提高緩衝部1的緩衝性,只要增加織布5的經紗5a或緯紗5b的單纖維的根數即可,但單純只是增加根數,受到壓縮會容易扁平化,緩衝部1的耐久性會降低。因此,本發明的發明人為了得到良好的緩衝性及足夠的耐久性,不只是單純地使織布5的經紗5a或緯紗5b的至少一方為膨鬆紗,還進一步將複數根膨鬆紗合撚而形成膨鬆紗複合撚紗1c。
緩衝部1為片狀物。緩衝部1的厚度太薄就會有緩衝性不良之虞,太厚則會有熱傳遞性不良之虞。因此,雖然用途不同也會有差異,但緩衝部1的適切的厚度以設定在例如0.5至5.0mm的範圍內為佳。此外,在將兩層以上的緩衝部1積層而使用的情況,以將合計厚度設定在0.5至5.0mm的範圍內為佳。
回到圖1進行說明。在緩衝部1中,在構成織布5之纖維的表面係附著有聚合物材料6。聚合物材料6係適度地進入膨鬆紗複合撚紗所具有的空隙7及編織結構的空隙7內,但並未完全填滿空隙7,所以緩衝部1中仍會殘存有空隙7。因此,本實施型態之熱壓用緩衝材10會發揮良好的緩衝性。再者,本實施型態之熱壓用緩衝材10為採用膨鬆紗複合撚紗織成的織布型態,所以與不織布相比較,為單位面積重量精度較良好,面內均勻性良好的材料。而且,本實施型態之熱壓用緩衝材10因為是織布的型態,所以厚度可做得比不織布薄,可成為熱傳遞性也良好的材料。
聚合物材料6並沒有特別的限制,可採用合成橡膠或合成樹脂。作為聚合物材料6,具體而言,合成橡膠可舉例有:氟橡膠、EPM、EPDM、氫化腈橡膠(hydrogenated nitrile rubber)、矽氧橡膠(silicone rubber)、丙烯酸橡膠 (acrylic rubber)、丁基橡膠(butyl rubber)等,合成樹脂可舉例有:氟樹脂、聚醯亞胺樹脂(polyimide resin)、聚醯胺樹脂(polyamide resin)、聚醚醚酮樹脂(polyetheretherketone resin)等。聚合物材料以具有高於加壓溫度之熱分解溫度(5%重量減少溫度)及玻璃轉移溫度者較佳。從此觀點來說,特別偏好的聚合物材料為氟橡膠及聚醯亞胺樹脂。
聚合物材料係保護玻璃纖維並且結合纖維的接點(除了經紗與緯紗的接點之外,也包含構成膨鬆紗之絲狀纖維(filament)彼此間的接點)。因此,採用聚合物材料6之熱壓用緩衝材10可減低反復使用於熱壓時之玻璃纖維的破損,且抑制織布5的所謂的永久變形,並可維持良好的緩衝性。
(緩衝部1的緩衝性)
將以230℃的溫度、0.01kgf/cm2的加壓力壓縮熱壓用緩衝材10時的厚度表示為t1,將以230℃的溫度、40kgf/cm2的加壓力壓縮熱壓用緩衝材10時的厚度表示為t2時,熱壓用緩衝材10的緩衝性Fn可表示為(t1-t2)×1000/t2
此外,以上述的加壓試驗條件對熱壓用緩衝材10進行壓縮時的厚度t1、t2可用Instron萬能材料試驗機(Instron公司製)、AUTOGRAPH精密萬能試驗機(株式會社島津製作所製)等之具有壓縮機能的試驗機量測出。
如此量測而算出的緩衝性Fn在400以上較佳。使緩衝性Fn在這樣的範圍內,可使熱壓用緩衝材10具有足夠的緩衝性。Fn值的更佳的範圍為420以上,又更佳的範圍為450以上。
(膨鬆紗複合撚紗的燒失量)
為了抑制織布5的永久變形,維持熱壓用緩衝材10的良好的特性,聚合物材料6附著於構成緩衝部1的織布5的纖維的表面。聚合物材料6的附著量較佳為在 進行燒失量試驗之際,從熱壓用緩衝材10取出的附著有聚合物材料6之膨鬆紗複合撚紗的燒失量(LOI:Loss on Ignition)在5至30質量%。此外,燒失量在8質量%以上更佳,燒失量在25質量%以下更佳。所謂的燒失量試驗,係指高溫加熱從熱壓用緩衝材10取出的膨鬆紗複合撚紗,量測聚合物材料6的成分的一部分揮發後的膨鬆紗複合撚紗的重量變化之試驗。
燒失量的試驗方法,係首先從熱壓用緩衝材採取出各邊長為50mm之正方形的試樣,從該試樣拔出10根膨鬆紗複合撚紗。亦即,準備10根長50mm的膨鬆紗複合撚紗。將此等試料充分乾燥後,以裝在坩堝內的狀態進行秤重。將此時的重量表示為ma。
然後,將裝有試料的坩堝放入馬弗爐(muffle furnace),以約650℃加熱約一小時後,秤量裝有試料的坩堝的重量。將此時的重量表示為mb。
若將坩堝的質量表示為mc,則燒失量LOI可用下式表示。
LOI=(ma-mb)/(ma-mc)×100
[另一實施型態之熱壓用緩衝材]
熱壓用緩衝材10只要至少具備緩衝部1即可,亦可只具備緩衝部1。熱壓用緩衝材10的緩衝部1可為一層,亦可為複數層。
圖5係顯示另一實施型態之熱壓用緩衝材10a之圖。如圖5所示,在熱壓用緩衝材10a中,在緩衝部1的表面透過接著層部3而積層有表層部2。表層部2主要是為了賦予熱壓用緩衝材離型性而設置。表層部2的材料可使用合成樹脂膜、或是在由織布所構成的基材的表面側塗佈離型性樹脂而形成者等。尤其,為了能夠承受高溫熱壓,以採用高溫使用時尺寸安定性良好,不會變形、密接,離 型性良好的材料較佳。此外,表層部2的厚度以在例如0.1至0.5mm較佳。另外,接著層部3以採用與緩衝部1相同的聚合物材料為佳。
圖6係顯示另一實施型態之熱壓用緩衝材10b之圖。如圖6所示,在熱壓用緩衝材10b中,兩層緩衝部1透過接著片部4而積層。而且,在各緩衝部1的上下的表面分別透過接著層部3而積層有表層部2。緩衝部1係使聚合物材料滲入包含於玻璃纖維製的織布中而構成,因此其厚度有限制,如上述將兩層緩衝部1疊合而構成的話,具有可使緩衝部1的總厚度更厚之優點。另外,緩衝部1間的接著雖然只利用接著劑也可進行,但在此情況,會有接著劑跑到緩衝部1的編織結構的間隙內而導致緩衝性降低的情形。因此,以採用接著片部4較佳。此外,接著片部4為例如在由通常的玻璃纖維紗1a所構成的平織的織布塗佈接著劑而構成之片狀的接著層。該接著劑以採用與緩衝部1一樣的聚合物材料為佳。為了防止從側面的纖維磨損、絨毛脫落,可用耐熱樹脂被覆所製成的熱壓用緩衝材的側面。
[實施型態之熱壓用緩衝材的製造方法]
首先,準備經紗或緯紗的至少一方係為膨鬆紗複合撚紗之織布。膨鬆紗複合撚紗係將由玻璃纖維構成的膨鬆紗(glass bulky yarn:玻璃膨體紗)複數根合撚而形成。織布的編織方式並沒有限制,可採用例如平織、斜紋織、其他公知的編織方式。
接著,使聚合物材料(氟橡膠或聚醯亞胺樹脂等)附著於構成織布之纖維的至少表面。例如,在聚合物材料為氟橡膠的情況,可將織布浸漬於以預定的濃度將未加硫氟橡膠溶解而成的未加硫氟橡膠溶液後,使織布充分地乾燥,藉此使氟橡膠附著於構成織布之纖維的表面,而製作出緩衝部(緩衝片)1。此外, 在聚合物材料為聚醯亞胺樹脂的情況,可例如將預定的濃度的聚醯亞胺樹脂清漆(varnish)塗佈於織布,然後使織布充分地乾燥,藉此使聚醯亞胺樹脂附著於構成織布之纖維的表面,而製作出緩衝部(緩衝片)1。
聚合物材料的附著量以控制在例如20至300g/m2為佳。聚合物材料的附著量可藉由用樹脂滾筒、橡膠滾筒、金屬滾筒等滾軋來調整。此外,聚合物材料的附著量如上述,較佳為在進行燒失量試驗之際,從熱壓用緩衝材取出的附著有聚合物材料之膨鬆紗複合撚紗的燒失量在5至30質量%。
如此而得到的在纖維的表面附著有聚合物材料之織布因為在纖維受到固定且被覆蓋的狀態,所以即使是在高溫下使用,也可維持織布的形狀及空隙。因此,即使在重復使用的情況也可確保良好的緩衝性。
熱壓用緩衝材在具有表層部(表層片)2的情況,可採用例如在作為基材之片體的作為表面側之一面塗佈作為表層部2之聚醯亞胺樹脂,並在使之乾燥後,在作為接著面側之另一面塗佈作為接著層部3之氟橡膠或聚醯亞胺樹脂,然後使之乾燥而得到的表層片。
熱壓用緩衝材在具有接著片部(接著片)4的情況,可採用例如在作為基材之片體的兩面塗佈氟橡膠或聚醯亞胺樹脂,然後使之乾燥後而得到的接著片4。接著片部4亦可為不具有基材之膜。
熱壓用緩衝材為積層複數層片狀物而成的構造之情況,可藉由將緩衝部1與其他片狀物積層(例如將表層部(表層片)2、緩衝部(緩衝片)1、接著片部4、緩衝部(緩衝片)1、表層部(表層片)2積層),然後藉由進行熱壓使之一體化而製造。
本發明之熱壓用緩衝材可在印刷基板等之積層板的製程中進行加壓成型或熱壓著之際,使用與以往一樣的如圖8所示的方法。亦即,以將本實施型態之熱壓用緩衝材10插入於熱盤13與被加壓材12之間的狀態進行熱壓,藉此可使施加於被加壓材12之熱及壓力在整個面均勻化。
以下,揭示製造實施例及比較例的緩衝材,然後調查緩衝性的結果、以及進行燒失量試驗的結果。其中,實施例1至2及比較例1至4為包含有表層片及接著片之構成,比較例5為不包含表層片及接著片等而只有緩衝片之構成。
(實施例1)
準備將四根玻璃紗(E玻璃纖維,單纖維徑6μm,單纖維總根數800根,支數67.5tex)合撚再施以膨鬆加工而得到的膨鬆紗三根,並準備將該三根膨鬆紗合撚而得到的膨鬆紗複合撚紗(單纖維總根數9600根)。準備將該膨鬆紗複合撚紗用於織布的緯紗而織成的雙重織膨體玻璃纖維布作為織布材料。使氟橡膠滲入包含於該玻璃纖維布中而作為緩衝基材。準備兩層份的該緩衝基材。另外,準備將氟橡膠塗被於平織玻璃纖維布的兩面而成的接著片。並且,準備兩層份的將聚醯亞胺樹脂塗佈於平織玻璃纖維布的一面並將接著用的氟橡膠塗佈於另一面而得到的表層片。將該些材料以從上而下依序為表層片、緩衝基材、接著片、緩衝基材、表層片的順序積層,然後藉由進行熱壓使之一體化而得到熱壓用緩衝材的試樣。
(實施例2)
除了使用玻璃紗(E玻璃纖維,單纖維徑9μm,單纖維總根數400根,支數67.5tex)作為膨鬆紗複合撚紗(單纖維總根數4800根)之外,以與實施例1一樣的方法製作出熱壓用緩衝材,而得到試樣。
(比較例1)
將四根與實施例1相同的玻璃紗合撚再施以膨鬆加工而得到膨鬆紗(單纖維總根數3200根),並將該膨鬆紗用作為織布的緯紗而織成雙重織膨體玻璃纖維布作為織布材料。亦即,使用的膨鬆紗並未再做成膨鬆紗複合撚紗。使氟橡膠滲入包含於該玻璃纖維布中而作為緩衝基材。準備六層份的該緩衝基材。另外,準備五層份的與實施例1一樣的接著片。並且,準備兩層份的與實施例1一樣的表層片。將該些材料以從上而下依序為表層片、緩衝基材、接著片、緩衝基材、接著片、緩衝基材、接著片、緩衝基材、接著片、緩衝基材、接著片、緩衝基材、表層片的順序積層,然後藉由進行熱壓使之一體化而得到熱壓用緩衝材的試樣。
(比較例2)
對玻璃紗(E玻璃纖維,單纖維徑9μm,單纖維總根數7800根,支數1390tex)施以膨鬆加工而得到膨鬆紗,將膨鬆紗用作為織布的緯紗而織成雙重織膨體玻璃纖維布作為織布材料。亦即,使用的膨鬆紗並非合撚而成,也並未再做成膨鬆紗複合撚紗。使用該雙重織膨體玻璃纖維布,得到與實施例1一樣的構成的熱壓用緩衝材的試樣。
(比較例3)
準備將兩根與實施例1相同的玻璃紗合撚而得到的紗四根,並準備對該四根紗合撚而得到的紗(單纖維總根數6400根)施以膨鬆加工而得到的膨鬆紗。亦即,並未將膨鬆紗合撚成為膨鬆紗複合撚紗,而是對合撚的紗施以膨鬆加工做為膨鬆紗。將該膨鬆紗用於織布的緯紗而織成雙重織膨體玻璃纖維布作為織布材料。使用該雙重織膨體玻璃纖維布,得到與實施例1一樣的構成的熱壓用緩衝材的試樣。
(比較例4)
使用單位面積重量為450g/m2之聚間伸苯基間苯二甲酸醯胺(polymetaphenylene isophthalamide)製不織布作為緩衝基材。使用三層緩衝基材、兩層與實施例1中使用者相同的接著片、兩層與實施例1中使用者相同的表層片,將之以從上而下依序為表層片、緩衝基材、接著片、緩衝基材、接著片、緩衝基材、表層片的順序積層,然後藉由進行熱壓使之一體化而得到熱壓用緩衝材的試樣。
(比較例5)
將20張單位面積重量為190g/m2的牛皮紙(craft paper)疊合,而得到熱壓用緩衝材的試樣。
針對各種熱壓用緩衝材以下述的要領進行加壓耐久性試驗,並量測試驗前後的厚度及緩衝性的變化。其結果顯示於表1中。
[加壓耐久性試驗條件]
加壓力:40kgf/cm2
加壓時間:75分鐘
溫度:230℃
加熱時間:60分鐘(在30分鐘內從25℃升溫到預定溫度,然後保持該狀態30分鐘)
冷卻時間:15分鐘
試樣尺寸:280mm×280mm
加壓機:150t測試加壓機(關西滾筒株式會社製)
(緩衝性的評價方法)
針對各種試樣,分別評價其接受加壓前、以及接受1次、10次、50次、100次及200次的加壓後的緩衝性。其中,比較例5之試樣因為不是能夠承受反復加壓之熱壓用緩衝材,所以只接受1次加壓。對於各種試樣進行下述的加壓試驗。並且,由以0.01kgf/cm2的加壓力壓縮時的厚度t1與以40kgf/cm2的加壓力壓縮時的厚度t2的差(μm)求出壓縮緩衝性Fn。其結果顯示於表1中。圖7係將表1畫成曲線圖而成者。
加壓力:40kgf/cm2
溫度:230℃
預熱:以0.05kgf/cm2的加壓條件進行2分鐘
加壓速度:1mm/min
試樣尺寸:25mm
Figure 111143585-A0202-12-0014-10
試樣採取位置:從耐久性試驗用試樣的距離端緣5cm以上的位置選取一處
試驗裝置:Instron萬能材料試驗機5565型(Instron Japan Company,Ltd.製)
此外,將Fn值400以上的試樣評價為緩衝性良好,將接受10次加壓後的Fn值仍在400以上的試樣評價為耐久性良好。
[表1]
Figure 111143585-A0202-12-0014-1
另外,針對各種熱壓用緩衝材進行燒失量試驗,量測試驗後的燒失量。其結果也一併顯示於表1中。此外,燒失量試驗針對使用織布之實施例1至2及比較例1至3而進行。
如表1所示,滿足本發明的條件之實施例1、2中,在任何加壓次數都具有Fn在400以上的良好的緩衝性。另一方面,比較例1中,雖然即使實施複數次的加壓之後緩衝性也不易降低,在耐久性方面算是優良,但緩衝性本身並不高。比較例5則是緩衝性及耐久性都低。至於比較例2至4,雖然初期的緩衝性高,但在一次的試驗之後緩衝性就降低很多,到10次的加壓之後,Fn就降到400以下,並非能夠在重復使用的情況得到穩定的緩衝性之材料。
另外,從表1可知,滿足本發明的條件之實施例1、2中,燒失量在5至30質量%。
[產業上的利用可能性]
根據本發明,可提供即使在反復使用的情況也能夠維持良好的緩衝性之熱壓用緩衝材。
1:緩衝部
1b:膨鬆紗
1c:膨鬆紗複合撚紗
5:織布
5a:經紗
5b:緯紗
6:聚合物材料
7:空隙
10:熱壓用緩衝材

Claims (5)

  1. 一種熱壓用緩衝材,係具有緩衝部,
    前述緩衝部係包含:
    在經紗或緯紗的至少一方採用合撚紗之織布;以及
    附著於構成前述織布的纖維的表面之聚合物材料,
    前述合撚紗係將由玻璃纖維構成的複數根膨鬆紗合撚而形成。
  2. 如請求項1所述之熱壓用緩衝材,其中,
    前述玻璃纖維的單纖維的直徑係3至11μm。
  3. 如請求項1或2所述之熱壓用緩衝材,其中,
    構成前述合撚紗之單纖維的總根數係3000根至100000根。
  4. 如請求項1或2所述之熱壓用緩衝材,其中,
    將以230℃、0.01kgf/cm2的條件壓縮前述熱壓用緩衝材時的厚度表示為t1,將以230℃、40kgf/cm2的條件壓縮前述熱壓用緩衝材時的厚度表示為t2時,由下述(1)式求出的Fn係400以上,
    Fn=(t1-t2)×1000/t2...(1)。
  5. 如請求項1或2所述之熱壓用緩衝材,其中,
    從前述熱壓用緩衝材取出的附著有前述聚合物材料之前述合撚紗的燒失量係5至30%。
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