經濟部中央標準局员工消費合作社印製 211592 a6 ______B6_ 五、發明説明（！） 發明背景 1 .發明範園 本發明係關於用於精確過濾的圓筒狀濾器，將利用噴 熔點所製得的超細纖維繽繞成圃筒狀的方式製得該圜筒狀 濾器，本發明亦係關於圓筒狀濾器之製法。 2 .相關技藝之描述 已經知道有多種濾器都是藉著將人工合成繅維模製成 圃筒狀的方式而製得。Japanese patent publication No. ShQ 56 - 4 3 1 39描述一種在加熱的情況下，將複合嫌維 的粗梳絲纏繞在心軸上的方法。但是，根據該方法，不容 易使尺寸不大於1d/f的細纖維穩定地用於梳理程序上 。因此，無法得到用以收集不大於10微米細粒的濾器。 此外，在傳統的合成纖維中，油化劑被塗覆在繊維上，以 避免紡絲、拉伸、梳理.........等期間會產生靜電或有磨擦 。這些油化劑會引發一些問題，如：在過濾期間，它會由 纖維上流至濾液中，使得濾液起泡或污染了該濾液。 此外，關於用於精確過濾的圚筒狀濾器，利用噴熔法 ，以超細織維所製得的濾器廣泛地被用於電子材料之清潔 溶液的過濾上，或者被用於除塵的空氣過濾器上，或者作 爲水的預濾器.........等，也被用於薬品的過濾上。 Japanese patent application laid-open No. Sho 6 0 - 2 1 68 1 8提出一種將利f喷熔法所得到的纖維纏練在心 軸上的方法，所用的方法是纏繞之前，先將織維的溫度降 本紙張又度逯用中國國家標準（CNS〉甲4规格（210 X 297公釐) -3 - 82^3. 40,〇〇〇 -------II :--------------裝------訂-------^ (請先閲讀背面之注意事項再塡寫本頁) A6 B6 經濟部中央樣準局员工消費合作社印*- 五、發明説明（2 ) 至彼此不會相黏合的溫度，該發明同時也提出一種藉著控 制紡絲的狀況而來逐漸地改變在濾器厚度方向上的嫌維直 徑的方法。在這樣的濾器上，纖維之所以黏在一起完全是 因爲彼此纏結的綠故，完全與黏合作用無關。因此，嫌維 的硬度變得太低，使得它承受壓力的能力顯得不足。爲了 要提高其硬度，可以考慮使用一邊加熱一邊加以纏繞的方 法，但是，在纖維熔點時，纖維網會變成膜，所以，濾層 會被堵住，或者，濾靥的孔隙大小會變得不均匀，所製得 的濾器的過濾壽命和精確度都會欠佳。 Japanese patent application laid-open No. Hei 1-297113提出將利用噴熔法所製得的多種非梭織纖維纊繞 起來的方法，所用的每種纖維的直徑和整體密度都不同， 每種纖維依序地纏繞多次，使得濾器的內層比較緻密，外 屠比較稀鬆。但是，根據此方法，必須要先準備多種 織物，不但製造步驟繁瑣，所得到的濾器的非梭織物的各 、 , — 個織維之間不會黏合在一起，各層之間也無法黏合在一起 。因此，在濾器的使用期間，因爲層與屠之間可能會被剝 離，所以會有溶液滲漏的情況發生，且其耐壓的程度也會 不足。 發明概述 本發明的目的是要提出一種用於精確過濾的濾器，該 嫌器有較佳的耐壓性質，不會被濾液所污染，有較長的過 濂壽命，其產製方法也比較簡單。 (請先閲讀背面之注意事項再塡寫本頁) -裝· 訂· 本紙張尺度逯用中國國家標準（CN’S)甲4规格（210 X 297公釐） 82.3. 40,000 A6 B6 211592 五、發明説明（3 ) (請先閲讀背面之注意事項再填寫本頁) 爲了要解決上述的問題，本發明者致力於硏究，結果 發現：將以堆叠法所製得的超細複合纖維網繽繞起來，可 以達到此目的。利用噴熔法，持績地改變纏繞在心軸上的 纖維的直徑，同時，對纖維網進行加熱，僅使熔點較低的 部分熔解，以這樣的方式可完成本發明。 本發明之特徵在於： (1 )由堆叠的超細複合纖維（由熔點較高的組份和 熔點較低的組份所構成，此二種組份分別由噴 熔法製得）所形成的圓筒狀濾器，其纖維直徑 隨著濾器的厚度方向及欲過濾的流體的通過方 向而逐漸減小，複合纖維的接觸點是由熔點較 低的組份加以熔融黏合的。 (2 )如第（1 )項之園筒狀濾器，其中，濾器上之 複合纖維的纖維直徑由濾器表面上的〇. 5至 3. 0微米變化至濾器外表面上的2. 5— 1 0微米。 經濟部中央櫺準局員工消费合作社印製 (3 )圓筒狀濾器之製法，其步驟包括：使熔點較高 的組份與熔點較低的組份（此二組份中皆含有 使纖維成形的熱塑性聚合物）進行複合噴熔紡 絲，使得紡絲期間，纖維的直徑隨著濾器的厚 度方向及欲過濾的流體的通通方向而逐渐減小 ，將纖維網堆叠或纏繞在心軸上，在心軸上形 成圓筒狀，在將此纖維堆叠或纏繞在心軸上之 前和/或之時或之後，使所得到的此嫌維網在 82.3. 40,000 本紙張尺度通用中®國家標準（CNS)甲4規格（210 X 297公货） 211592 A6 B6 經濟部中央標準居R工消費合作社印製 五、發明説明（4 ) 比熔點較髙的組份之熔點爲低、比熔點較低的 組份之熔點爲高的溫度下進行熱處理，最後， 將心軸取出。 (4 )如第（3 )項之製造圓筒狀濾器的方法，其中 ，在噴熔紡絲時，將受壓空氣吹在熔融絲上， 使得紡絲期間的空氣壓力持績地降低或逐步地 降低。 (5 )如第（3 )項之製造固筒狀濾器的方法，其中 ，在紡絲期間，由枋絲噴嘴所壓出的聚合物的 壓出速率持續地提高或逐步地提高。 (6 )囲筒狀濾器之製法，其步驟包：使熔點較高的 組份與熔點較低的組份（此二組份中皆含有使 纖維成形的熱塑性聚合物）進行噴熔複合紡絲 ，將所得到的纖維堆叠起來形成纖維網，將二 或多個這樣的纖維網堆*或鐮繞在心軸上，在 心軸上形成圓筒狀，並將心軸取出；此纖維網 的纖維直徑隨著濾器的厚度方向及欲過濾的流 體的通過方向而改變，在將此織維網堆叠或鐮 繞在心軸上之前和/或之時或之後，此纖維網 在比高熔點組份之熔點爲低、比低熔點組份之 熔點爲高的溫度下進行熱處理。 (7 )如第（6 )項之製造園筒狀濾器的方法，其中 ，在將此織維網堆叠或纊繞在心軸上之前，先 將此纖維網作成非梭繊物。 (請先閲讀背面之注意事項再填寫本頁) ——裝· 訂. 線- 本紙張尺度適用中國國家標準（CNS)甲4规格（210 X 297公釐） 82.3. 40,000 A6 B6 211592 五、發明説明（5 ) 較佳的實施例之詳述 本發明將詳述於下。 此處所謂的圓筒狀濾器是指横截面爲圃形、概圆形' 多角形（如：三角形、四角形.........等）的園筒狀滅器。 若心軸的多角形（如：六角形、八角形.........等）’在嫌 維網連績地纏繞或堆叠在心軸上時，纏繞在多角形的外層 形狀會變得比較圖，會接近圓形，這對過濾的性質並沒有 影響。 使兩種熔點不相同（其間的差別以不小於2 〇 °C爲佳 )之可使纖維成形的熱塑性樹脂（如：聚烯烴、聚酯、聚 醯胺.........等）進行複合的紡絲，作成面對面的形式或作 成覆層-核心的形式（熔點較低的樹脂作爲覆層），以這 樣的方式可製得本發明之濾器所用的複合纖維。在覆層一 核心的形式中，複層可與核心呈離心圓，核心組份也可以 呈多孔結構。纖維的截面可以是圓形、橢圓形或他種不同 的形狀。此複合纖維之結構的特點在於：纖維橫截面的外 緣至少有一部分是由熔點較低的組份所構成。對於熔點較 低的組份在織維橫截面的外緣中所佔的比例沒有一定的限 制，舉例來說，其比例可隨纖維軸的方向而改變。簡言之 ，這樣的複合結構，使得吾等可藉著下面所描述的熱處理 方式，使得熔點較低的組份能夠在織維的各個接觸點上以 熱熔黏合的方式黏合在一起。進行複合紡絲所用之熔點較 高的組份及熔點較低的組份之實例如下：聚乙烯/聚丙嫌 本紙張尺度通用中國國家標準（CNS)甲4規格（210 X 297公釐） ----------」----.---------裝一：-----#------^ (請先閲讀背面之注意事項再塡寫本頁) 經濟部中央標準局R工消费合作社印製 82.3. 40,000 A6 B6 211592 五、發明説明（6 ) 、聚丙烯/聚酯、尼龍6 /尼龍6 6 .........等。如果此二 種樹脂的熔點差低於2 0°C，那麼熱處理的溫度範圍就會 變得比較窄，程序控制的難度就相對提高。另一方面，以 重量計，此二種組份的複合比例通常是8 0/2 0至 2 0/8 0，以6 5/3 5至3 5/6 5爲佳，最好是 4 5/5 5 至 5 5/4 5。 在利用噴熔法來將複合纖維紡作成纖維網時，可使用 Japanese patent application laid-open No. Sho 60-99507中所提出的紡絲嘴，兩種類型的熱塑性樹脂在溶 解之後，分別由壓出機壓入紡絲板中，然後，使用髙速的 熱空氣使得熔解的樹脂自紡絲帽中被吹出，將所得到的超 細複合纖維堆叠在收集運輸帶上。 至於在噴熔期間，纖維直徑的改變情形，直徑隨著壓 出的樹脂量的增加而提高，隨著熱空氣流速的提髙而變小 。因此，這些狀況的一或二者持績或逐步地發生，所得到 的纖維之直徑可能會隨著纖維網的厚度方向而持績地或逐 步地改變。 在本發明中，纖維的直徑隨著濾器的厚度方向及欲過 濾的流體的通過方向而逐漸減小。也就是說，當液流由圖 筒狀滤器的外表面流往園筒狀濾器的內表面時，繊維的直 徑由園筒狀濾器的外表面向著圓筒狀濾器的內表面的方向 逐漸減小。反之，當液流由圓筒狀濾器的內表面流往圓筒 狀濾器的表面時，嫌維的直徑由圓筒狀濾器的內表面向著 園筒狀濾器的外表面的方向逐漸減小。使用這樣的結構， 本紙張尺度通用中國國家標準（CNS)甲4規格（210 X 297公釐） -8 - 82.3. 40,000 (請先閲讀背面之注意事項再填寫本頁) _裝_ 訂. 經濟部中央標準局S工消費合作社印製 211592 A6 經濟部中央標準局8工消费合作杜印製 B6_ 五、發明説明（7 ) 在溶液的入口處的織維較厚，使得濾器有較大的空間，在 溶液的入口處的織維較厚，使得濾器的空間較小，以這樣 的方式得到具有密度梯度的濾器。因此，較細的顆粒在濾 器之較厚的方向上被抓住，因此可使得濾器有較長的使用 壽命。 隨著濾器的厚度方向而改變繊維的直徑時，在濾器的 入口表面上，纖維直徑以介於2. 5和10微米之間爲佳 ，最好是介於3和8微米之間，在濾器的出口表面上，纖 維直徑以介於〇. 5和3. 0微米之間爲佳，最好是介於 0. 8和2. 5微米之間。 在本發明中，將織維堆*起來而形成超細複合纖維網 時，延著厚度的方向，改變纒繞或堆叠在心軸上的織維的 直徑，以這樣的方式製得圓筒狀濾器，在纏繞於心軸上之 前和/或鐮繞於心軸上之時或之後進行熱處理。此處所謂 的熱處理是在比高熔點組份之熔點爲低、比低熔點組份之 熔點爲高的溫度下進行加熱處理。由噴熔法所製得之直徑 持縯地改變的纖維所形成的超細複合纖維網，經過熱處理 而形成非梭織的織品以後，先行儲存，然後，在纏繞於心 軸上之前或纏繞於心軸上之時或之後，再度被加熱，形成 本發明的圃简狀濾器。視情況地，在紡絲之後所得到的嫌 維網，在纏繞於心軸上之前或纊繞於心軸上之時或之後被 加熱，形成園筒狀濾器。 藉著這樣的熱處理，在纖維網內側的複合嫌維之間有 固定的接觸點，藉著熔融黏合的方式，經纏練的織維網層 本紙張尺度逯用中國國家缥準（CNS>甲4规格（210 X 297公釐） _ g . 82.3. 40,000 ---------------'---------；-裝 I:-----•玎------.^. (請先閲讀背面之注意事項再填寫本頁) A6 B6 211592 五、發明説明（8 ) 也被固定在複合纖維之沸點較低的組份之間。因此，可得 到能耐高壓的濾器。 進行熱處理的時機最好是在繡繞在心軸上之前或一邊 纏練一邊進行熱處理。此時，因爲纖維彼此之間會固著在 —起，不會固著在纖維網的內層上，所以濾器能夠承受纏 繞期間所造成的外壓，同時，在內層中，纖維間的空間也 比較緻密。因此，可隨著纖維直徑的改變而形成密度梯度 ，因此，可同時擁有極佳的耐壓能力、細顆粒的分類效果 及收集效果。 通常，濾器被流經的液體所壓縮，織維之間的空間會 被堵塞，因而縮短了濾器的使用壽命。在流雔黏度較大時 ，此情況更爲明顯。但是，根據本發明，由熔點較高的組 份和熔點較低的組份所構成的複合纖維經過熱處理，在級 維的接觸點上，只有在熔點較低的組份會有熔融黏合的情 況發生；因此，所得到的濾器會因爲纖維的接觸點而形成 三維結構，此結構足以避免因爲液壓所造成的堵塞情況。 因此，在本發明中，不須在內層部分添加多孔基質、加固 材料.........等，濾器因爲擁有極佳的耐壓性質，所以擁有 穩定的過濾精確度及較長的使用壽命。在濾器結構中，如 果只有複合纖維中之熔點較低的組份會黏合在織維的接觸 點上而形成三維結構，此結構仍然不夠穩固，即使嫌維的 直徑隨濾器的厚度方向而改變亦然，此時，濾器中的纖維 的熔化和變形會造成堵塞而縮短了濾器的使用壽命；此時 ，就無法達到本發明的效用。 衣纸張尺度遘用中國國家標準（CNS)甲4規格（210 X 297公釐) _川_ —82.3. 40,000 ------------i J---------裝------.玎-------嫁 (請先閲讀背面之注意事項再場寫本頁) 經濟部中央標準局貝工消费合作社印製 經濟部中央標準曷8工消费合作社印製 211592 五、發明説明（9 ) 熱處理的熱源有：熱空氣、受壓蒸汽、超熱熱汽、遠 紅外光加熱器.........等，其中，因爲要在不干擾此織維網 的情況下均匀地加熱，所以遠紅外光加熱器是特別佳者。 控制加熱區的溫度、加熱區的長度或流動速率（即，在加 熱區的停留時間）.........等，來調整熱處理的程度，以得 到所欲的黏合固著度及所欲的空間密度。纏繞在心軸上並 經過熱處理的纖維網在室溫下靜置，以使其冷卻，然後將 心軸取出，切成適當的長度得到圓筒狀濾器。 以噴熔法製得纖維網之後，在將它纏繞起來的時候， 可在不影響本發明之效用的情況下，將細顆粒（如：活性 碳、沸石、離子交換樹脂.........等）或功能性的樹脂（如 :碳纖維、無菌纖維、可吸附氣髋的纖維.........等）混入 纖維網中，或混入纖維網間。因此，也可製造出除了收集 細粒顆粒之外仍具有它種功能的濾器。現將以下面的實例 和比較例對本發明作進一步的說明。在實例中所用的測量 方法描述如下。 循環帶式的過濾測試設備，組件包括：內含3 0升水 的水槽、幫浦和過濾裝置。濾器樣品被固定在過濾裝置的 罩上。水的循環速率是3 0升/分鐘，將5克的塊狀物（ carborundum #400)加入水槽中。加入塊狀的1分鐘之後 所收集到之過濾過的水（1 〇 〇毫升）再以可以收集不小 於0 . 6微米顆粒的膜濾器再過濾一次。以儀器測定膜滅 器所收集到的顆粒尺寸，以求出其顆粒大小分佈、最大的 顆粒尺寸（流出的顆粒的最大直徑（微米）），以判定此 ---------------.-----------裝——----、玎------.^ (請先閲讀背面之注意事項再塡寫本頁) 本紙張尺度迺用中a國家揉準（CNS)甲4规格（210 X 297公釐） _ 11 _ 82.3. 40,000 A6 B6 211592 五、發明説明（1〇) 濾器樣品的過濾精確度。 一個濾器樣品被固定在循環帶式的過濾測試設備中， 水的循環速率是3 0升/分鐘。在水槽中加入2 0克火山 灰壤的下層土粉末（平均顆粒直徑：1 2. 9微米；9 9 重量％以上的粉末的顆粒直徑介於0.1和30微米之間 )，然後繼續循環過濾。當水槽中的水變得澄清時，測定 過濂前後的壓力差。重覆地加入粉末及進行壓力差的測定 ，直到濾器變形或者壓力差超過10公斤/平方公分爲止 。由第一次加入粉末直到濾器變形之間的使用時間稱爲過 濾壽命，將此時的壓力稱爲加壓組力。 纖維平均直徑： 由纖維網、非梭織纖維或濾器上切下十個薄片（每個 都是4公分見方），使用掃S描式的電子顯微鏡，以 5 0 0 0倍的放大倍數照相，測得每個纖維的1 0 0個端 點的直徑。所測得的直徑的平均値視爲纖維平均直徑。 賨例1 利用噴熔法，使用覆層一核心類型所用的噴絲板裝置 ，複合噴熔紡絲的紡絲噴嘴（每個噴嘴的直徑是0. 3毫 米，噴嘴數：5 0 1 )排成一列，作爲核心組份的聚丙 烯（熔融流速（MFR，230 °C) :280克/10分 鐘，熔點：1 6 4°C，紡絲溫度：2 9 0 °C)及作爲覆層 組份之線形的低密度聚乙烯（熔融流速（MFR，1 9 0 °C ) : 1 2 4克/1 0分鐘，熔點：1 2 2°C，紡絲溫度 (請先閱讀背面之注意事項再塡寫本頁) -6 Γ 經濟部中央標準局貝工消费合作社印製 本紙張尺度通用中國國家標準（CNS)甲4規格（210 X 297公釐） -1 9 - 82.3. 40,000 211592 A6 B6 經濟部中央標準局w工消费合作社印製 五、發明説明（n) :2 6 0 °C)以覆層一核心的形式被壓出，覆層一核心的 複合比例是5 0/5 0，總壓出速率是1 2 0克/分鏟， 使用3 8 0 °C的受壓空氣狀紡絲噴嘴的壓出物吹在網狀物 運输帶上，得到超細複合纖維網。受壓空氣連縝地餵入紡 絲噴嘴中，壓力由3. 2公斤/平方公分重力加速度的初 壓逐漸降低，末壓爲0. 6公斤/平方公分重力加速度。 以逮紅外光加熱器將此纖維網熱至1 4 5°C，同時以 網狀物運輸帶使其移動，然後將此纖維網纏繞在圓形的不 銹鋼管上（外徑：3 0毫米），並使所得到的纖維網在室 溫下冷卻，如：Japanese patent application No. Sho 5 6 - 4 3 1 3 9所提到的方法。然後，將不銹鋼管取出 ，將纖維網切成2 5 0毫米長，得到園筒狀濾器（內徑： 30毫米，外徑：6Q毫米，長度：250毫米）。 由此樣品所取得的數據如下： 在濾器的厚度方向上的各個部分所取得的繅維平均直 徑：內表面上是0. 8微米，離內表面5毫米處爲1. 8 微米，離內表面10毫米處爲2. 7微％外表面上爲 7 _ 6微米。 在此濾器中，各個纖維藉著熔點較低的組份（聚乙烯 )的熔融作用而在接觸點上彼此黏合，形成三維的堅固結 構，即使該濾器撞在桌上，它也不會變形。此濾器的過濾 精確度是9微米，加壓阻力是6. 3公斤/平方公分 ，過濾壽命是3 0分鐘。在過濾初期並未觀察到有起泡的 情況發生。 本紙張尺度迺用中國國家標準（CNS)甲4規格_ η _ 82.3. 40,000 ----------l·——：---------裝-----.玎------線 (請先閲讀背面之注意事項再填寫本頁) 211592 A6 B6 經濟部中央標準局8工消費合作社印製 五、發明説明（12) 賨例2 ' 利用噴熔法，使用與實例1相同的噴絲板裝置，作爲 核心組份的聚對苯二甲酸乙二醇酯（內稟黏度：〇 · 60 ，熔點：253 °C，紡絲溫度：285。(：）及作爲覆層組 份的對苯二甲酸乙二醇酯—異酞酸酯共聚物（內稟黏度： 0. 58，熔點：160°(：，紡絲溫度：270 °<：)以覆 層一核心的形式被壓出，覆層一核心的複合比例是5 0/ 5 0，總壓出速率的1 2 0克/分鐘，使用3 5 0 °C的受 壓空氣將紡絲噴嘴的壓出物吹在網狀物運輸帶上，得到超 細複合纖維網。受壓空氣連績地餵入紡絲噴嘴中，壓力由 2. 8公斤/平方公分重力加速度的初壓逐漸降至0. 4 公斤/平方公分重力加速度的末壓。以逮紅外光加熱器將 此繊維網熱至1 7 0°C，同時以網狀物運輸帶使其移動， 然後將此纖維網纏練在外徑爲3 0毫米的圖形不銹鋼管上 ，並使所得到的纖維網在室溫下冷卻。然後，將不銹鋼管 取出，將纖維網切成2 5 0毫米長，得到圓筒狀濾器（內 徑：30毫米，外徑：60毫米，長度：250毫米）。 在濾器的厚度方向上的各個部分所取得的織維平均直 徑：內表面上是1. 8微米，離內表面5毫米處爲3_ 9 微米，離內表面1 0毫米處爲6 . 8微米，外表面上爲 9 . 2微米。 在此濾器中，各個纖維藉著熔點較低的組份的熔融黏 合而彼此黏合在一起，形成三維的堅固結構。此濾器的過 本紙張尺度迺用中a國家標準（CNS)甲4規格（210 X 297公釐） -14 _ 82.3. 40,000 ------- -----r---.----------裝^------,玎------線 <請先閲讀背面之注意事項再填寫本頁) A6 B6 211592 五、發明説明（13) 濾精確度是1. 6微米，加壓阻力是7. 4公斤/平方公 分，過嫌薄命是3 6分鐘。在過滅初期並未觀察到有起泡 的情況發生。 眚例3 利用噴熔法，使用覆層-核心類型所用的噴絲板裝置 ，複合噴熔紡絲的紡絲噴嘴（噴嘴直徑：〇· 3毫米， 噴嘴數：5 0 1 )排成一列，作爲核心組份的聚丙烯（溶 融流速（MFR，230 °C) :204克/10分鐘，溶 點：1 6 5°C，紡絲溫度：2 8 0 °C)及作爲覆層組份之 線形的低密度聚乙烯（熔融流速（MFR，1 9 0°C): 1 2 4克/1 0分鐘，熔點；1 2 2°C，紡絲溫度： 2 4 0 °C )以覆層一核心的形式被壓出，覆層一核心的複 合比例是5 0/5 0，初時的壓出速率是1 2 0克/分鐘 ，中段之後的壓出速率改爲1 6 0克/分鐘。使用壓力爲 1. 9公斤/平方公分重力加速度的受壓空氣將紡絲噴嘴 的壓出物吹在網狀物運輸帶上，得到超細複合娥維網。 以遠紅外光加熱器將此纖維網熱至1 4 5°C，同時以 網狀物運输帶使其移動，然後將此纖維網纏繞在圓形的不 銹鋼管上（外徑：3 0毫米），並使所得到的纖維網在室 溫下冷卻，如.Japanese patent application No. Sho 5 6 — 4 3 1 3 9所提到的方法。然後，將不銹鋼管取出 ，將纖維網切成2 5 0毫米長，得到画筒狀濾器（內徑： 3 0毫米，外徑：6 0毫米，長度：2 5 0毫米）。 -15 - ----------l·——：--------'f..-----.玎------嫁 (請先閲讀背面之注意事項再塡寫本頁) 經濟部中央標準局員工消費合作社印製 本紙張尺度迺用中國國家標準（CNS>甲4規格（210 X 297公釐） 82.3. 40,000 211592 A6 B6 經濟部中央標準局员工消費合作社印*'|衣 五、發明説明（14) 在濾器的厚度方向上的各個部分所取得的織維平均直 徑：由內表面至9毫米處的平均直徑是1· 8微米，與內 表面的距離大於9毫米處的平均直徑是2. 7微米。在此 濾器中，各個纖維藉著熔點較低的組份的熔融黏合而彼此 黏合在一起，形成三維的堅固結構。此濾器的過濾精確度 是2. 6微米，加壓阻力是6.1公斤/平方公分，過濾 壽命是3 Q分鐘。在過濾初期並未觀察到有起泡的情況發 生。 賨例4 利用喷熔法，使用覆層-核心類型所用的噴絲板裝置 ，複合噴熔紡絲的紡絲噴嘴（噴嘴直徑：〇. 3毫米，噴 嘴數：5 0 1 )排成一列，作爲核心組份的聚丙烯（熔融 流速（MFR，2 3 0 °C) : 2 0 4克/1 0分鐘，熔點 :1 6 5°C，紡絲溫度：2 8 0 °C)及作爲覆層組份之線 形的低密度聚乙烯（熔融流速（MFR，1 9 0°C): 1 2 4克/1 0分鐘，熔點；1 2 2T，紡絲溫度： 2 4 0 °C )以覆層一核心的形式被壓出，湲層一核心的 複合比例是7 0/3 0，總壓出速率是1 2 0克/分鐘， 使用壓力爲1. 9公斤/平方公分重力加速度、溫度爲 3 6 0 °C的受壓空氣將紡絲噴嘴的壓出物吹在網狀物運輸 帶上，得到超細複合纖維網（纖維平均直徑：2 . 4微米 )。將此纖維網纏繞在以遠紅外光加熱器熱至1 4 0°C的 力口熱容器上，得到的非梭繊物（非梭娥物A )(嫌維平均 ---------— I.---U----------裝一.-----、玎------0 (請先閲讀背面之注意事項再填寫本頁) 本纸張尺度通用中國®家標準（CNS)甲4規格（210 X 297公釐） 16 - 82.3. 40,000 211592 五、發明説明（15) 直徑：2 · 4微米）。 以與上面相同的方式，但將總壓出速率改爲1 6 0克 /分鐘，得到非梭織物（非梭織物B )(嫌維平均直徑： 8 . 8微米）。 一邊以遠紅外光加熱器在1 4 5°C加熱，一邊將非梭 織纖維A纒繞在圓形的不銹鋼管上（外徑：3 〇毫米）， 使厚度爲1 0毫米，然後，以相同的加熱方式，將非梭織 纖維B纏練在非梭織繊維A上至厚度爲5毫米，並使其在 室溫下冷卻。然後，將不銹鋼管取出，得到園简狀濾器（ 內徑：3 0毫米，外徑：6 0毫米，長度：2 5 0毫米） 0 此濾器也會藉著熔點較低的組份的熔融黏合而彼此黏 合在一起，形成三維結構的堅固產物（過濾精確度： 2. 4微米，加壓阻力：7· 7公斤/平方公分，過濾薄 命是3 0分鐘）。在過濾初期並未觀察到有起泡的情況發 生。 實例5 經濟部中央標準局3工消費合作社印製 f請先閲讀背面之注意事項再填寫本頁) Γ 利用噴熔法，使用面對面類型所用的噴絲板裝置，複 合噴熔紡絲的紡絲噴嘴（噴嘴直徑：0 . 3亳米，噴嘴數 :5 0 1 )排成一列，作爲第一種組份的聚丙烯（熔融流 速（MFR，230 °C) :280 克/10 分鐘，熔點： 1 6 4°C，紡絲溫度：2 9 0 °C)及作爲第二種組份之線 形的低密度聚乙烯（熔融流速（MFR，1 9 0°C): 本紙張尺度通用中國a家標準（CNS)甲4規格（210 X 297公*) . ]7 - 82.3. 40,000 經濟部中央櫺準局具工消費合作社印製 A6 S41532--- 五、發明説明（16) 1 2 4克/1 0分鐘，熔點；1 2 2°C，紡絲溫度： 2 6 0 °C)以7 0/3 0的複合比例被歷出，總壓出速率 是1 2 0克/分鐘，使用溫度爲3 8 0 °C的受壓空氣將壓 出的聚合物吹在網狀物運輸帶上，得到超細複合繊維網。 受壓空氣連縯地餵入紡絲噴嘴中，壓力由3. 2公斤/平 方公分重力加速度的初壓逐漸降低，末壓爲0. 6公斤/ 平方公分重力加速度。 以遠紅外光加熱器將此纖維網熱至1 4 5°C，同時以 網狀物運输帶使其移動，然後將此纖維網纏練在圃形的不 銹鋼管上（外徑：3 0毫米），並使所得到的纖維網在室 溫下冷卻，如：Japanese patent application No. Sho 5 6 — 4 3 1 3 9所提到的方法。然後，將不銹鋼管取出 ，將纖維網切成2 5 0毫米長，得到圓筒狀滤器（內徑： 3 0毫米，外徑：6 0毫米，長度：2 5 0毫米）。 在濾器的厚度方向上的各個部分所取得的織維平均直 徑：內表面上是0. 9微米，離內表面5毫米處爲1. 6 微米，離內表面10毫米處爲2. 8微米，外表面上爲 7. 3微米。在此濾器中，各個織維藉著熔點較低的組份 (聚乙烯）的熔融作用而在接觸點上彼此黏合，形成三維 的堅固的結構，即使該濾器撞在桌上，它也不會變形。此 濾器的過濾精確度是9微米，加壓阻力是6.1公斤 /平方公分，過濾壽命是2 9分鐘。在過濾初期並未觀察 到有起泡的情況發生。 本紙張尺度通用t國國家標準（CNS)甲4规格（210 X 297公釐) _ _ 82.3. 40,000 ----I---：-------,---------装------，訂------線 (請先閲讀背面之注意事項再填寫本頁) A6 B6 211592 五、發明説明（17) 音例6 利用噴熔法，使用與實例5相同的噴絲板裝置所得到 超細複合纖維網以遠紅外光加熱器熱至1 4 5°C，一邊以 網狀物運輸帶使其移動，一邊將此繊維網纏繞在外緣爲正 六角形的不銹鋼管上（每邊的長度是1 5毫米），並使所 得到的織維網在室溫下冷卻。然後，將不銹鋼管取出，將 纖維網切成2 5 0毫米長，得到圊筒狀濾器。此濾器的最 大外徑爲6 0毫米，最小外徑是5 2毫米，也就是說，它 的形狀趨於圓形。 此濾器中，纖維彼此之間藉著與聚乙烯的熔融作用而 在接觸點上彼此黏合，形成三維結構，即使讓濾器撞在桌 上，它也不會變形。此濾器的過濾精確度是〇. 9微米， 加壓阻力是5. 7公斤/平方公分，過濾壽命是30分鐘 。在過濾初期並未觀察到有起泡的情況發生。 窗例7 使用覆厝一核心類型所用的噴絲板裝置，複合噴熔紡 絲的紡絲噴嘴（噴嘴直徑：〇 3毫米，噴嘴數：5 0 1 )排成一列，作爲核心組份的聚丙烯（熔融流速（MF R ,2 3 0 °C ) : 180 克/10 分鐘，熔點：165 °C， 紡絲溫度：2 8 0 °C)及作爲覆層組份的丙嫌一乙嫌一1 一丁烯共聚物（熔融流速（MFR，190°C) :135 克/1 0分鐘，熔點；1 3 8°C，紡絲溫度：3 0 〇°C) 以覆層一核心的形式被壓出，褢層一核心的複合比例是 本紙張尺度通用中囷國家標準（CNS)甲4规格（210 X 297公釐） _ . 82.3. 40,000 -----------l· — !----------裝丨^-----,玎------線 (請先閲讀背面之注意事項再塡寫本頁) 經濟部中央標準局员工消費合作社印製 211592 經濟部中央標準局貝工消费合作社印製 A6 B6_ 五、發明説明（18) 5 0/5 0，初時的總壓出速率是1 2 0克/分鐘，中段 之後提高壓出速率，使壓出速率變成1 6 0克/分鐘。 由多孔管作成的心軸以1 0米/分鐘的外緣速率旋轉 ，同時管內抽眞空，由紡絲噴嘴壓出的聚合物被受Μ空氣 (溫度：3 6 0 °C，歷力：1. 9公斤/平方公分）吹在 核心上，藉此將超細複合纖維網堆在核心上並.纏繞在核心 上。 在纏繞完成之後，持績抽氣及旋轉，使織維網與核心 一起在利用遠紅外線加熱器熱至1 4 0°C的加熱容器中加 熱，並使所得到的纖維網在室溫下冷卻。然後，將心軸取 出，將纖維切成2 5 0毫米長，得到園筒狀濾器（內徑： 3 0毫米，外徑：6 0毫米，長度：2 5 0毫米）。 由此樣品所取得的數據如下： 在濾器的厚度方向上的各個部分所取得的纖維平均直 徑：離內表面不超過9毫米處爲1. 6微米，離內表面超 過9毫米處爲2. 8微米。在此濾器中，各個織維藉著熔 點較低的組份的熔融作用而在接觸點上彼此黏合，形成三 維的堅固結構，即使該濾器撞在桌上，它也不會變形。此 嫌器的過濾精確度是2. 5微米，加壓阻力是6. 8公斤 /平方公分，過濾壽命是2 7分鐘。在過濾初期並未觀察 到有起泡的情況發生。 比較例1 利用噴熔法，使用噴熔紡絲所用的噴絲板裝置，噴熔 '----------.---^-----------裝------訂-------線 (請先閲讀背面之注意事項再填寫本頁) 本纸張尺及遴用中國國家標準（CNS)甲4规格（210 X 297公釐） 20 82.3. 40,000 A6 B6 211592 五、發明説明（19) 紡絲的紡絲噴嘴（噴嘴直徑：〇. 3毫米，噴嘴數： 5 0 1 )排成一列，作爲核心組份的聚丙烯（熔融流速（ MFR，230 °C) ·· 180 克/10 分鐘，熔點： 1 6 4°C)在紡絲溫度爲2 8 0 °C的情況下被壓出，壓出 速率是1 2 0克/分鐘，以溫度爲3 8 0 °C的受壓空氣將 由噴嘴出來的壓出物吹到網狀物運输帶上，得到超細纖維 網。受壓空氣連績地餵入紡絲噴嘴中，壓力由3. 2公斤 /平方公分重力加速度的初壓逐漸降低，末壓爲〇. 6公 斤/平方公分重力加速度。 以與實例1相同的方式，以遠紅外光加熱器將此纖維 網熱至1 9 0°C，同時以纖維網狀物運输帶使其移動，然 後將此纖維網纏繞在圓形的不銹鋼管上（外徑：3 0毫米 )，並使所得到的纖維網在室溫下冷卻。然後，將不銹鋼 管取出，將纖維網切成2 5 0毫米長，得到圚筒狀濾器（ 內徑：3 0毫米，外徑：6 0毫米，長度：2 5 0毫米） 〇 在濾器的厚度方向上的各個部分所取得的纖維平均直 徑：內表面上3. 4微米，離內表面5毫米處爲8. 2微 米，離內表面1 0毫米處爲1 5微米，外表面上爲2 2微 米。纖維網本身會因爲纖維的熔化及變形而造成堵塞，所 以此濾器非常堅硬。此濾器在過濾初期並未觀察到有起泡 的情況發生。此濾器的過濾精確度是3. 2微米，加壓阻 力是6 · 5公斤/平方公分，過濾壽命很短，是5分鐘。 本紙張尺度適用中國B家標準（CNS)甲4規格（210 X 297公21 - 82.3. 40,000 ;·-----------^---.---------裝------.玎------嫁 (請先閲讀背面之注意事項再塡寫本頁) 經濟部中央標準局貝工消费合作社印製 經濟部中央標準局ιβ工消費合作社印製 A6 <>.11592_Be_ 五、發明説明（2〇) 比較例2 使用與比較例1相同的狀況，但所用的受壓空氣的壓 力固定爲3. 2公斤/平方公分重力加速，製得圃筒狀瀘 器。此濾器由平均直徑爲〇. 9微米的複合縝維所構成， 濾器上的每一點的纖維平均直徑皆爲〇· 9微米，濾器的 內徑是3 0奄米，外徑是6 0毫米，長度爲2 5 0奄米。 此濾器的過濾精確度是〇. 9微米，加壓阻力是6. 5公 斤/平方公分，過濾壽命很短，是1〇分鐘。 比較例3 使用與比較例1相同的狀況，但所用的受壓空氣的壓 力固定爲0. 6公斤/平方公分重力加速，製得圚筒狀濾 器。此濾器由平均直徑爲7. 3微米的複合嫌維所構成， 濾器上的每一點的纖維平均直徑皆爲7. 3微米，濾器的 內徑是3 0毫米，外徑是6 0毫米，長度爲2 5 0亳米。 此濾器加壓阻力是6. 05公斤/平方公分，過濾壽 命是50分鐘，但其過濾精確度欠佳，是7. 0微米。 參考例1 利用噴熔紡絲法，製得纖維平均直徑爲1. 3微米的 聚丙烯纖維網，將此纖維網鐮繞在經加固的多孔園筒上， 形成市售的濾器（內徑：3 0毫米，外徑：6 0奄米，長 度：2 5 0毫米），然後測定其性質。 此濾器在過濾初期並未觀察到有起泡的情況發生，嫌 ----·1.----— I.---.--------——裝丨-----、玎------Φ· (請先閲讀背面之注意事項再塥寫本頁) 衣紙張尺度適用中國國家標準（CNS>甲4規格（210 X 297公;*·) -22 - 82.3. 40,000 211592 A6 B6 五、發明説明（21) 維的平均直徑不大，其過濾精確度欠佳，是9. 0微米： 其加壓阻力低，是1. 8公斤/平方公分，過濾壽命短， 是8分鏟。推究其原因，應該是纖維幾乎完全是藉著磨擦 力而固定，濾器內部的孔洞會因爲水壓而張開，此會降低 過濾精確度，或者濾器本身會變形。 本發明之應用： 根據本發明之濾器，因爲超細複合纖維係利用噴熔法 而製得，且鼸著濾器的厚度方向改變纖維的直徑，而使得 濾器的內側和外側之間的空間大小有比較大的變化，所以 ，其過濾精確度較佳，過率壽命也較長。另一方面，因爲 纖維藉著熔點較低的組份的黏合作用而彼此黏合在一起而 形成三維結構，所以不須使用加固材料，即使在加壓過濾 時亦然，濾器的孔洞不會張開，所以加壓阻力性質較佳， 亦可穗定地進行精確過濾。此外，因爲不須使用嫌維加工 時常用的油化劑，所以濾液不會被油化劑所污染，所以此 減器可安全地被用在食品加工的範圍，也可被用在電子儀 器的範圍中。 ----卜：----— |卜|-_卜---------装------訂------線 , - . (請先閲讀背面之注意事項再場寫本頁) 經濟部中央標準局员工消費合作社印製 本纸張尺度適用中國國家標準（CNS)甲4规格（210 X 297公釐） -23 - 82.3. 40,000211592 a6 ______B6_ printed by the Employees ’Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs V. Description of the invention (!) Background of the invention 1. The scope of the invention The invention relates to a cylindrical filter used for precise filtration, which will use the super The cylindrical filter is manufactured by winding fine fibers into a cylindrical shape. The invention also relates to a method for manufacturing a cylindrical filter. 2. Description of related techniques It is known that there are many kinds of filters that are made by molding synthetic reel into a cylindrical shape. Japanese patent publication No. ShQ 56-4 3 1 39 describes a method of winding a composite comb-like thick comb wire on a mandrel under heating. However, according to this method, it is not easy to stably use fine fibers with a size not greater than 1 d / f for carding procedures. Therefore, a filter for collecting fine particles of not more than 10 microns cannot be obtained. In addition, in the traditional synthetic fiber, the oiling agent is coated on the grid to avoid static electricity or friction during spinning, drawing, carding, etc ... These oiling agents can cause problems, such as during filtration, it can flow up from the fiber into the filtrate, causing the filtrate to foam or contaminate the filtrate. In addition, as for the cylindrical filter used for precise filtration, the filter made by the ultra-fine weave dimension using the spray-melting method is widely used in the filtration of cleaning solutions for electronic materials, or in air filtration for dust removal It can also be used as a pre-filter for water ... and so on. Japanese patent application laid-open No. Sho 6 0-2 1 68 1 8 proposes a method of winding the fiber obtained by the f-fusing method on the mandrel. The method used is to first weave the temperature of the weave before winding. The cost-reducing paper is also used in the Chinese National Standard (CNS> A4 specifications (210 X 297 mm) -3-82 ^ 3. 40, 〇〇〇 ------- II: ------ -------- installed ------ ordered ------- ^ (please read the precautions on the back before writing this page) A6 B6 Printed by the Employee Consumer Cooperative of the Central Prototype Bureau of the Ministry of Economic Affairs *-Fifth, the description of the invention (2) To a temperature that does not stick to each other, the invention also proposes a method of gradually changing the dimensional diameter in the thickness direction of the filter by controlling the spinning condition. On the filter, the fibers stick together because they are entangled with each other, which is completely irrelevant to the adhesion. Therefore, the hardness of the suspected dimension becomes too low, making it less able to withstand pressure. In order to improve its Hardness can be considered using the method of winding while heating, but when the fiber melting point, the fiber web will become a film, so The filter layer will be blocked, or the pore size of the filter will become uneven, and the filter life and accuracy of the manufactured filter will be poor. Japanese patent application laid-open No. Hei 1-297113 proposed to The method of entanglement of a variety of non-woven fibers made by the spray-melting method, the diameter and overall density of each type of fiber used are different, and each type of fiber is wound multiple times in sequence, making the inner layer of the filter relatively dense, The outer slaughter is relatively sparse. However, according to this method, a variety of fabrics must be prepared first. Not only is the manufacturing process cumbersome, the non-woven fabrics of the resulting filter will not be bonded together, and between the layers It cannot be glued together. Therefore, during the use of the filter, because the layer and the slaughter may be peeled off, there will be a solution leakage, and the degree of pressure resistance will also be insufficient. SUMMARY OF THE INVENTION The purpose is to propose a filter for accurate filtration. The filter has better pressure resistance, will not be polluted by the filtrate, has a long over-life, and its production method is relatively simple (Please read the precautions on the back before writing this page)-Binding · Order · This paper uses the Chinese National Standard (CN'S) A 4 specifications (210 X 297 mm) 82.3. 40,000 A6 B6 211592 V. Description of the invention (3) (Please read the precautions on the back before filling in this page) In order to solve the above problems, the inventors are devoted to the investigation, and found that: the superfine composite fiber web made by the stacking method This can be achieved by winding it up. Using the spray-melting method, the diameter of the fiber wound on the mandrel is continuously changed, and at the same time, the fiber web is heated to melt only the part with a lower melting point. invention. The features of the present invention are as follows: (1) A circle formed by stacked superfine composite fibers (composed of a component with a higher melting point and a component with a lower melting point, which are made by spray melting methods) In the cylindrical filter, the fiber diameter gradually decreases with the thickness direction of the filter and the passing direction of the fluid to be filtered. The contact point of the composite fiber is melt-bonded by the component with a lower melting point. (2) The cylindrical filter of item (1), wherein the fiber diameter of the composite fibers on the filter varies from 0.5 to 3.0 microns on the surface of the filter to 2.5-1 on the outer surface of the filter 0 microns. (3) The manufacturing method of the cylindrical filter produced by the Employee Consumer Cooperative of the Central Bureau of Trade and Industry of the Ministry of Economic Affairs. The steps include: making the component with a higher melting point and the component with a lower melting point (both of these components contain fiber forming Thermoplastic polymer) to perform composite spray melt spinning, so that during spinning, the diameter of the fiber gradually decreases with the thickness direction of the filter and the direction of the fluid to be filtered, and the fiber web is stacked or wound on the mandrel. Form a cylindrical shape on the mandrel, before and / or during or after stacking or winding this fiber on the mandrel, so that the obtained dimensional mesh is 82.3. 40,000 copies of the paper standard in the national standard (CNS) A 4 Specifications (210 X 297 public goods) 211592 A6 B6 Printed by the Central Standard of the Ministry of Economic Affairs, R, R, and Consumer Cooperatives 5. Description of the invention (4) The melting point of the component with a higher melting point is lower than that of the lower melting point The heat treatment is performed at a temperature with a high melting point, and finally, the mandrel is taken out. (4) The method of manufacturing a cylindrical filter as described in item (3), wherein, during spray spinning, compressed air is blown on the molten yarn, so that the air pressure during spinning is continuously reduced or gradually To lower. (5) The method of manufacturing a solid cylindrical filter according to item (3), wherein, during spinning, the extrusion rate of the polymer extruded by the filigree nozzle is continuously increased or gradually increased. (6) The method of manufacturing a cylindrical filter, the steps of which include: making a component with a higher melting point and a component with a lower melting point (both of these components contain a thermoplastic polymer that forms a fiber) by spray-melting composite spinning , The resulting fibers are stacked to form a fiber web, two or more such fiber web piles * or sickles are wound on the mandrel, a cylindrical shape is formed on the mandrel, and the mandrel is taken out; the fiber diameter of this fiber web As the thickness direction of the filter and the passing direction of the fluid to be filtered change, before and / or during or after stacking or sickling the woven mesh on the mandrel, the fiber web has a melting point higher than the melting point component. Heat treatment is performed at a temperature lower than the melting point of the lower melting point component. (7) The method of manufacturing a cylindrical filter as described in item (6), wherein, before stacking or winding the woven mesh on the mandrel, the fiber mesh is made into a non-shuttle. (Please read the precautions on the back before filling in this page) ——Binding · Binding. Thread-This paper scale is applicable to China National Standard (CNS) A 4 specifications (210 X 297 mm) 82.3. 40,000 A6 B6 211592 V. Invention Description (5) Detailed description of preferred embodiments The present invention will be described in detail below. The so-called cylindrical filter here refers to a cylindrical extinguisher with a cross-section of a garden shape, a substantially circular shape, a polygonal shape (such as a triangular shape, a quadrangular shape, etc ...). If the polygon of the mandrel (such as: hexagonal, octagonal, etc ...) is wound or stacked on the mandrel, the outer shape of the mandrel will change Comparing the graph, it will be close to a circle, which has no effect on the nature of the filter. Thermoplastic resins (such as polyolefins, polyesters, polyamides, etc.) that make the two types of melting points different (the difference between them is preferably not less than 2 ° C) are preferred. ) Composite spinning is performed in the form of face-to-face or in the form of a coating-core (a resin with a lower melting point as a coating). In this way, the composite fibers used in the filter of the present invention can be obtained. In the form of cladding-core, the cladding may be centrifugal with the core, and the core components may also be porous. The cross-section of the fiber can be round, oval or other different shapes. The characteristic of the structure of this composite fiber is that at least a part of the outer edge of the fiber cross-section is composed of components with a lower melting point. There is no limit to the proportion of the lower melting point component in the outer edge of the cross section of the weave dimension. For example, the proportion can be changed with the direction of the fiber axis. In short, such a composite structure allows us to use the heat treatment method described below to enable components with lower melting points to be bonded together at the contact points of the weave dimension by hot melt bonding. Examples of components with a higher melting point and components with a lower melting point used for composite spinning are as follows: Polyethylene / Polypropylene paper size General Chinese National Standard (CNS) A 4 specifications (210 X 297 mm)- -------- "----.--------- Pack one: ----- # ------ ^ (Please read the precautions on the back before writing This page) Printed 82. 40,000 A6 B6 211592 by the R and Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs 5. Description of the invention (6), polypropylene / polyester, nylon 6 / nylon 6 6 ......... etc. . If the melting point difference between the two resins is less than 20 ° C, the temperature range of the heat treatment will become narrower, and the difficulty of program control will be relatively increased. On the other hand, the compound ratio of these two components is usually 8 0/2 0 to 2 0/8 0 by weight, preferably 6 5/3 5 to 3 5/6 5 and preferably 4 5 / 5 5 to 5 5/4 5. When the composite fiber is spun into a fiber web by spray melting method, the spinning nozzle proposed in Japanese patent application laid-open No. Sho 60-99507 can be used. After the two types of thermoplastic resins are dissolved, they are separately pressed Press the machine into the spinning board, and then use the high-speed hot air to blow the melted resin out of the spinning cap, and stack the resulting ultra-fine composite fibers on the collection conveyor belt. As for the change of the fiber diameter during the melt-spraying process, the diameter increases as the amount of extruded resin increases, and decreases as the hot air flow rate increases. Therefore, one or both of these conditions may or may occur gradually, and the diameter of the resulting fiber may change continuously or gradually with the thickness direction of the fiber web. In the present invention, the diameter of the fiber gradually decreases with the thickness direction of the filter and the passing direction of the fluid to be filtered. That is to say, when the liquid flow flows from the outer surface of the cylindrical filter to the inner surface of the cylindrical filter, the diameter of the dimension gradually decreases from the outer surface of the cylindrical filter toward the inner surface of the cylindrical filter . Conversely, when the liquid flow flows from the inner surface of the cylindrical filter to the surface of the cylindrical filter, the diameter of the dimensional dimension gradually decreases from the inner surface of the cylindrical filter toward the outer surface of the cylindrical filter. Using this structure, the paper size is in accordance with the Chinese National Standard (CNS) A 4 specifications (210 X 297 mm) -8-82.3. 40,000 (please read the precautions on the back before filling this page) _ 装 _ Order. Economy Printed by the Ministry of Standards, Bureau of Industry and Consumer Cooperatives, 211592 A6. Printed by the Central Bureau of Standards, Ministry of Economic Affairs, Co., Ltd. 8 Printed by Duo B6_ V. Description of invention (7) The thick weave at the entrance of the solution makes the filter have more space The thick weave dimension at the entrance of the solution makes the space of the filter small. In this way, a filter with a density gradient is obtained. Therefore, the finer particles are caught in the thicker direction of the filter, so that the filter can have a longer service life. When changing the diameter of the dimension with the thickness direction of the filter, on the inlet surface of the filter, the fiber diameter is preferably between 2.5 and 10 microns, preferably between 3 and 8 microns, in the filter 5 微米 之间。 On the exit surface, the fiber diameter is preferably between 0.5 and 3.0 microns, preferably between 0.8 and 2.5 microns. In the present invention, when the weaving dimensions are piled up to form an ultra-fine composite fiber web, the diameter of the weaving dimension wound or stacked on the mandrel is changed along the thickness direction to produce a cylindrical filter in this way Heat treatment before or on the mandrel and / or on or after the mandrel is wound. The so-called heat treatment here refers to heat treatment at a temperature lower than the melting point of the high melting point component and higher than the melting point of the low melting point component. The ultra-fine composite fiber web formed by the fibers with continuously changing diameters produced by the spray-melting method is stored after heat treatment to form a non-woven fabric, and then, before being wound on the mandrel or wound on At or after the mandrel, it is heated again to form the garden simple filter of the present invention. Optionally, the mesh obtained after spinning is heated before or on or around the mandrel to form a cylindrical filter. Through such heat treatment, there is a fixed contact point between the composite dimensions on the inside of the fiber web, and through fusion bonding, the woven web layer of the tangled web is used in the paper standard of China National Standards (CNS). 4 specifications (210 X 297 mm) _ g. 82.3. 40,000 ---------------'---------; -install I: ----- • 玎 ------. ^. (Please read the precautions on the back before filling in this page) A6 B6 211592 5. Description of the invention (8) It is also fixed between the components with lower boiling point of the composite fiber. Therefore, a filter that can withstand high pressure can be obtained. The best time to perform heat treatment is to perform heat treatment before embroidering on the mandrel or while tangling. At this time, because the fibers will be fixed together, they will not be fixed. On the inner layer of the fiber web, the filter can withstand the external pressure caused during winding, and at the same time, the space between the fibers in the inner layer is relatively dense. Therefore, a density gradient can be formed as the fiber diameter changes, so , Can have excellent pressure resistance, fine particle classification effect and collection effect. Usually, the filter is affected by the liquid flowing through Compression, the space between the weave dimensions will be blocked, thus shortening the service life of the filter. This situation is more obvious when the viscosity of the flow curtain is larger. However, according to the present invention, the higher melting point component and melting point The composite fibers composed of low components are heat-treated. At the contact points of the dimensional dimension, only the components with lower melting points will melt and bond; therefore, the resulting filter will be formed due to the contact points of the fibers Three-dimensional structure, this structure is enough to avoid clogging caused by hydraulic pressure. Therefore, in the present invention, there is no need to add a porous matrix, reinforcement materials in the inner part ... etc., because the filter has excellent Pressure resistance, so it has a stable filtration accuracy and a long service life. In the filter structure, if only the component with a lower melting point in the composite fiber will adhere to the contact point of the weave dimension to form a three-dimensional structure, This structure is still not stable enough, even if the diameter of the dimension changes with the thickness direction of the filter, at this time, the melting and deformation of the fibers in the filter will cause clogging and shorten the filter. The service life; at this time, the effectiveness of the present invention cannot be achieved. For the size of clothing paper, the Chinese National Standard (CNS) A 4 specification (210 X 297 mm) is used. _ 川 _ —82.3. 40,000 ------- ----- i J --------- installed ------. 玎 ------- marry (please read the notes on the back before writing this page) Central Ministry of Economic Affairs Printed by the Bureau of Standards, Beigong Consumer Cooperative, printed by the Central Standard of the Ministry of Economy, printed by 211592 V. Description of the invention (9) The heat sources of heat treatment are: hot air, pressurized steam, superheated steam, and far-infrared light heaters. ....... Among others, the far-infrared light heater is particularly preferred because it is to be heated uniformly without disturbing this woven mesh. Control the temperature of the heating zone, the length of the heating zone or the flow rate (ie, the residence time in the heating zone) ... etc. to adjust the degree of heat treatment to obtain the desired degree of adhesion and fixation The desired spatial density. The fiber web wound on the mandrel and subjected to heat treatment is allowed to stand at room temperature to cool it, and then the mandrel is taken out and cut to an appropriate length to obtain a cylindrical filter. After the fiber web is produced by the spray-melting method, when it is wound up, fine particles (such as activated carbon, zeolite, ion exchange resin, etc.) can be used without affecting the effectiveness of the present invention ... .. etc.) or functional resin (such as: carbon fiber, sterile fiber, fiber that can absorb air hip .........) mixed into the fiber web, or into the fiber web. Therefore, it is also possible to manufacture a filter having other functions in addition to collecting fine particles. The present invention will now be further explained with the following examples and comparative examples. The measurement methods used in the examples are described below. Circulating belt-type filtration test equipment. The components include: a water tank containing 30 liters of water, a pump and a filtration device. The filter sample is fixed on the cover of the filter device. The water circulation rate was 30 liters / minute, and 5 grams of lump (carborundum # 400) was added to the water tank. The filtered water (100 mL) collected 1 minute after the addition of the lump is filtered again with a membrane filter that can collect particles not smaller than 0.6 microns. Use the instrument to measure the particle size collected by the membrane eliminator to find the particle size distribution and the maximum particle size (the maximum diameter (micrometer) of the outflowing particles) to determine this ---------- -----.----------- installed -------- 、 玎 ------. ^ (Please read the notes on the back before writing this page) This paper Standards used in China National Standards (CNS) A 4 specifications (210 X 297 mm) _ 11 _ 82.3. 40,000 A6 B6 211592 V. Description of the invention (1〇) The filtering accuracy of the filter sample. A filter sample was fixed in a circulating belt-type filtration test device, and the water circulation rate was 30 liters / minute. Add 20 grams of volcanic lime soil subsoil powder (average particle diameter: 1.29 micrometers; more than 9 9% by weight of the powder with a particle diameter between 0.1 and 30 micrometers) into the water tank, and then continue circulating filtration. When the water in the water tank became clear, the pressure difference before and after the pond was measured. Add the powder repeatedly and measure the pressure difference until the filter is deformed or the pressure difference exceeds 10 kg / cm2. The time between the first addition of powder and the deformation of the filter is called the filtration life, and the pressure at this time is called the pressurizing force. Average fiber diameter: Ten slices (each 4 cm square) are cut from a fiber web, non-woven fiber or filter, and scanned with a scanning S-type electron microscope at a magnification of 5000 times. The diameter of 100 end points of each fiber was measured. The average value of the measured diameters is regarded as the average fiber diameter.賨 例 1 Using the spray-melting method, using a spinneret device for a core type of cladding, a spinning nozzle for composite spray-melting spinning (the diameter of each nozzle is 0.3 mm, the number of nozzles: 5 0 1) row In a row, polypropylene as the core component (melt flow rate (MFR, 230 ° C): 280 g / 10 min, melting point: 164 ° C, spinning temperature: 290 ° C) and as the coating group Part of the linear low-density polyethylene (melting flow rate (MFR, 190 ° C): 1 2 4g / 1 0 minutes, melting point: 1 2 2 ° C, spinning temperature (please read the precautions on the back first (Write this page) -6 Γ Printed on the paper standard of the China National Standard (CNS) A4 specification (210 X 297 mm) by the Beigong Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs -1 9-82.3. 40,000 211592 A6 B6 Economy Printed by the Central Standards Bureau of the Ministry of Industry and Consumer Cooperatives V. Description of Invention (n): 2 6 0 ° C) Extruded in the form of a cladding-core, the composite ratio of the cladding-core is 5 0/5 0, total The extrusion rate is 120 g / min shovel, and the extrudate of the compressed air-like spinning nozzle at 380 ° C is blown on the mesh conveyor belt to obtain ultrafine composite fibers . The compressed air is fed into the spinning nozzle continuously, and the pressure is gradually reduced from the initial pressure of 3.2 kg / cm 2 gravitational acceleration, and the final pressure is 0.6 kg / cm 2 gravitational acceleration. The infrared fiber heater was used to heat the fiber web to 145 ° C, while moving it with a mesh conveyor belt, and then winding the fiber web on a round stainless steel tube (outer diameter: 30 mm) And allow the resulting fiber web to be cooled at room temperature, such as the method mentioned in Japanese patent application No. Sho 5 6-4 3 1 3 9. Then, the stainless steel tube was taken out, and the fiber web was cut into 250 mm long to obtain a cylindrical filter (inner diameter: 30 mm, outer diameter: 6Q mm, length: 250 mm). The data obtained from this sample is as follows: The average diameter of the reel dimension obtained in each part of the thickness direction of the filter: 0.8 microns on the inner surface, 1.8 microns at 5 mm from the inner surface, away from the inner surface At 10 mm, it is 2.7 μ%, and 7 — 6 μm on the outer surface. In this filter, the individual fibers are bonded to each other at the contact points by the melting action of the lower melting point component (polyethylene), forming a three-dimensional solid structure. Even if the filter hits the table, it will not be deformed. The filtration accuracy of this filter is 9 microns, the pressure resistance is 6.3 kg / cm2, and the filtration life is 30 minutes. No foaming was observed in the early stages of filtration. This paper uses the Chinese National Standard (CNS) A4 specifications _ η _ 82.3. 40,000 ---------- l · —— ： --------- installed ----- . 玎 ------ line (please read the precautions on the back before filling in this page) 211592 A6 B6 Printed by the Central Standards Bureau of the Ministry of Economy, Industry and Consumer Cooperatives 5. V. Description of Invention (12) Example 2 'Use of spray melting Method, using the same spinneret device as in Example 1, as a core component of polyethylene terephthalate (intrinsic viscosity: 0.60, melting point: 253 ° C, spinning temperature: 285. (: ) And ethylene terephthalate-isophthalate copolymer as the coating component (intrinsic viscosity: 0.58, melting point: 160 ° (:, spinning temperature: 270 ° < :) It is extruded in the form of a coating-core, the composite ratio of the coating-core is 50/50, the total extrusion rate is 120 g / min, and the pressure is 3 50 ° C Air blows the extrudate of the spinning nozzle on the mesh conveyor belt to obtain an ultra-fine composite fiber web. The compressed air is fed into the spinning nozzle successively, and the pressure is gradually reduced from the initial pressure of 2.8 kg / cm2 gravitational acceleration to the final pressure of 0.4 kg / cm2 gravitational acceleration. Infrared light heater is used to heat the grid to 170 ° C, and move it with a mesh conveyor belt, and then entangle the fiber web on a graphic stainless steel tube with an outer diameter of 30 mm, and make The resulting fiber web was cooled at room temperature. Then, the stainless steel tube was taken out, and the fiber web was cut into 250 mm long to obtain a cylindrical filter (inner diameter: 30 mm, outer diameter: 60 mm, length: 250 mm). The average diameter of the weave dimension obtained by each part in the thickness direction of the filter: 1.8 microns on the inner surface, 3-9 microns at 5 mm from the inner surface, and 6.8 microns at 10 mm from the inner surface, 9.2 microns on the outer surface. In this filter, the individual fibers are bonded to each other by fusion bonding of the lower melting point component to form a three-dimensional solid structure. This filter is used in the paper standard of China National Standards (CNS) A 4 specifications (210 X 297 mm) -14 _ 82.3. 40,000 ------- ----- r ---.- --------- installed ^ ------, 玎 ------ line < Please read the precautions on the back before filling in this page) A6 B6 211592 V. Description of the invention (13) Filtration accuracy is 1.6 microns, pressurization resistance is 7.4 kg / cm2, and excessive life is 3 6 minutes. No blistering was observed in the early stages of extinction. Example 3 Using the spray-melting method, using the spinneret device used in the cladding-core type, the spinning nozzles (nozzle diameter: 0.3 mm, number of nozzles: 5 0 1) of composite spray-spinning spinning are arranged in a row, Polypropylene as the core component (melt flow rate (MFR, 230 ° C): 204 g / 10 min, melting point: 165 ° C, spinning temperature: 280 ° C) and as the coating component Linear low-density polyethylene (melting flow rate (MFR, 190 ° C): 1 2 4g / 1 0 minutes, melting point; 1 2 2 ° C, spinning temperature: 2 4 0 ° C) with coating 1 The form of the core is extruded. The composite ratio of the coating to the core is 50/50. The initial extrusion rate is 120 g / min, and the extrusion rate after the middle section is changed to 160 g / min. The compressed air with a gravity acceleration of 1.9 kg / cm 2 is used to blow the extrudate of the spinning nozzle on the mesh conveyor belt to obtain an ultra-fine composite dimensional mesh. Heat the fiber web to 145 ° C with a far-infrared light heater, and move it with a mesh conveyor belt, and then wind the fiber web on a round stainless steel tube (outer diameter: 30 mm), The resulting fiber web is allowed to cool at room temperature, as described in Japanese patent application No. Sho 5 6 — 4 3 1 3 9. Then, the stainless steel tube was taken out, and the fiber web was cut into a length of 250 mm to obtain a cylindrical filter (inner diameter: 30 mm, outer diameter: 60 mm, and length: 250 mm). -15----------- l · ----: -------- 'f ..-----. 玎 ------ Marry (please read the back first (Notes to be written on this page) The paper printed by the Consumer Standardization Bureau of the Central Bureau of Standards of the Ministry of Economy uses the Chinese National Standard (CNS> A4 specifications (210 X 297 mm) 82.3. 40,000 211592 A6 B6 Central Bureau of Standards Employee Consumer Cooperative Print * '| Yiwu. Description of Invention (14) The average diameter of the weave dimension obtained at each part in the thickness direction of the filter: the average diameter from the inner surface to 9 mm is 1.8 microns, and the inner The average diameter of the surface at a distance greater than 9 mm is 2.7 microns. In this filter, each fiber is bonded to each other by fusion bonding of a component with a lower melting point to form a three-dimensional solid structure. The filter of this filter The accuracy is 2.6 microns, the pressure resistance is 6.1 kg / cm2, and the filter life is 3 Q minutes. No blistering was observed in the initial stage of filtration. Case 4 Using spray-melting method, using a coating -The spinneret device used for the core type, the spinning nozzle for composite spray melt spinning (nozzle diameter: 0.3 mm, Number of nozzles: 5 0 1) Lined up as a core component of polypropylene (melt flow rate (MFR, 2 3 0 ° C): 2 0 4 g / 1 0 min, melting point: 1 6 5 ° C, spinning Temperature: 2 8 0 ° C) and linear low-density polyethylene as a coating component (melt flow rate (MFR, 190 ° C): 1 2 4 g / 1 0 min, melting point; 1 2 2T, spinning Wire temperature: 2 4 0 ° C) It is extruded in the form of cladding-core, the composite ratio of the layer-core is 7 0/3 0, the total extrusion rate is 1 2 0 g / min, and the working pressure is 1 . Compressed air with a gravity acceleration of 9 kg / cm 2 and a temperature of 360 ° C blows the extrudate of the spinning nozzle on the mesh conveyor belt to obtain an ultra-fine composite fiber web (average fiber diameter: 2. 4 microns). This fiber web is wound on a force-contained heat container heated to 140 ° C with a far-infrared light heater to obtain a non-shuttle (non-shuo A) (average dimension ---- -----— I .--- U ---------- install one .----- 、 玎 ------ 0 (Please read the notes on the back before filling in this Pages) This paper standard is universal China® Home Standard (CNS) Grade 4 (210 X 297 mm) 16-82.3. 40,000 21159 2. V. Description of the invention (15) Diameter: 2 · 4 microns). In the same manner as above, but changing the total extrusion rate to 160 g / min, a non-woven fabric (non-woven fabric B) is obtained. Dimensional average diameter: 8.8 microns). While heating with a far-infrared light heater at 145 ° C, wrap the non-woven fiber A-Zuan on a round stainless steel tube (outer diameter: 30 mm), so that The thickness is 10 mm, and then, with the same heating method, the non-woven fiber B is entangled on the non-woven fabric A to a thickness of 5 mm, and allowed to cool at room temperature. Then, take out the stainless steel tube to obtain a simple filter (inner diameter: 30 mm, outer diameter: 60 mm, length: 2 50 mm). 0 This filter will also be melt-bonded by the lower melting point component And they are bonded together to form a solid product with a three-dimensional structure (filtration accuracy: 2.4 microns, pressure resistance: 7.7 kg / cm2, filtration life is 30 minutes). No foaming was observed in the early stage of filtration. Example 5 Printed by the Central Bureau of Standards of the Ministry of Economic Affairs 3 Printed by the Consumer Cooperative Society f, please read the notes on the back before filling in this page) Γ Using the spray-melting method, using the spinneret device for the face-to-face type, spinning of composite spray-melt spinning Nozzles (nozzle diameter: 0.3 mm, nozzle number: 5 0 1) are arranged in a row, as the first component of polypropylene (melt flow rate (MFR, 230 ° C): 280 g / 10 min, melting point: 1 6 4 ° C, spinning temperature: 2 9 0 ° C) and the linear low-density polyethylene as the second component (melt flow rate (MFR, 1 9 0 ° C): This paper scale is generally used in China. Standard (CNS) A4 specifications (210 X 297 g *).] 7-82.3. 40,000 Printed A6 S41532 by the Gongbei Consumer Cooperative of the Central Bureau of Economic Development of the Ministry of Economic Affairs-V. Description of the invention (16) 1 2 4 g / 10 minutes, melting point; 1 2 2 ° C, spinning temperature: 2 6 0 ° C) is calculated at a compound ratio of 7 0/3 0, the total extrusion rate is 120 g / min, the use temperature is 3 The compressed air at 8 0 ° C blows the extruded polymer on the mesh conveyor belt to obtain an ultra-fine composite mesh. The compressed air is fed into the spinning nozzle successively, and the pressure is gradually reduced from the initial pressure of 3.2 kg / cm2 gravitational acceleration, and the final pressure is 0.6 kg / cm2 gravitational acceleration. Heat the fiber web to 145 ° C with a far-infrared light heater, and move it with a mesh conveyor belt. Then wrap the fiber web on a garden-shaped stainless steel tube (outer diameter: 30 mm) And allow the resulting fiber web to be cooled at room temperature, such as the method mentioned in Japanese patent application No. Sho 5 6 — 4 3 1 3 9. Then, the stainless steel tube was taken out, and the fiber web was cut into 250 mm long to obtain a cylindrical filter (inner diameter: 30 mm, outer diameter: 60 mm, length: 250 mm). 8 毫米 ， The average diameter of the weave dimension obtained by each part in the thickness direction of the filter: 0.9 microns on the inner surface, 1.6 microns at 5 mm from the inner surface, and 2. 8 microns at 10 mm from the inner surface 3 微米。 On the outer surface is 7.3 microns. In this filter, the various fabric dimensions are bonded to each other at the contact point by the melting action of the lower melting point component (polyethylene) to form a three-dimensional solid structure. Even if the filter hits the table, it will not Deformed. The filtration accuracy of this filter is 9 microns, the pressure resistance is 6.1 kg / cm2, and the filtration life is 29 minutes. No foaming was observed in the early stage of filtration. The size of this paper is common to National Standards (CNS) A4 specifications (210 X 297 mm) _ _ 82.3. 40,000 ---- I ---: -------, ------- --Install ------, order ------ line (please read the precautions on the back before filling in this page) A6 B6 211592 V. Description of the invention (17) Example 6 Use spray melting method, use The ultrafine composite fiber web obtained by the same spinneret device as in Example 5 was heated to 145 ° C with a far-infrared light heater. While moving it with a mesh conveyor belt, the outer mesh was wound around the outer edge to be six Angle stainless steel tube (the length of each side is 15 mm), and allow the resulting woven mesh to cool at room temperature. Then, the stainless steel tube was taken out, and the fiber web was cut into 250 mm long to obtain a cylindrical filter. This filter has a maximum outer diameter of 60 mm and a minimum outer diameter of 52 mm, that is, its shape tends to be round. In this filter, the fibers are bonded to each other at the contact point by melting with polyethylene to form a three-dimensional structure. Even if the filter is hit on the table, it will not be deformed. The filtration accuracy of this filter is 0.9 microns, the pressure resistance is 5.7 kg / cm2, and the filtration life is 30 minutes. No foaming was observed in the initial stage of filtration. Window example 7 Using a spinneret device for a core-type coating, the spinning nozzles (nozzle diameter: 〇3 mm, number of nozzles: 5 0 1) of composite-spray melt-spinning are arranged in a row as a core component Propylene (melting flow rate (MF R, 2 3 0 ° C): 180 g / 10 min, melting point: 165 ° C, spinning temperature: 2 8 0 ° C) and the coating components as acetylene and acetylene 1 Monobutylene copolymer (melt flow rate (MFR, 190 ° C): 135 g / 10 min, melting point; 128 ° C, spinning temperature: 300 ° C) is coated in the form of a core Extruded, the composite ratio of the core layer of the jacket is the size of the current national standard (CNS) A 4 standard (210 X 297 mm) of this paper scale _. 82.3. 40,000 ----------- l · —! ---------- 装 丨 ^ -----, 玎 ------ line (please read the precautions on the back before writing this page) Employee consumption of the Central Standards Bureau of the Ministry of Economic Affairs Printed by the cooperative 211592 Printed by the Peking Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs A6 B6_ V. Description of the invention (18) 5 0/5 0, the initial total extrusion rate is 120 g / min. Rate, so that the extrusion rate becomes 160 g / min . A mandrel made of a porous tube rotates at an outer edge rate of 10 m / min. At the same time, the tube is emptied, and the polymer extruded by the spinning nozzle is subjected to M air (temperature: 3 6 0 ° C, strength: 1. 9 kg / cm 2) blowing on the core, thereby stacking the ultra-fine composite fiber web on the core and winding it on the core. After the winding is completed, the suction and rotation are carried out, so that the woven mesh and the core are heated in a heating container heated to 140 ° C using a far-infrared heater, and the resulting fiber web is cooled at room temperature. . Then, the mandrel was taken out, and the fiber was cut into 250 mm long to obtain a cylindrical filter (inner diameter: 30 mm, outer diameter: 60 mm, length: 250 mm). The data obtained from this sample are as follows: The average diameter of the fibers obtained at various parts in the thickness direction of the filter: 1. 6 microns at a position not exceeding 9 mm from the inner surface, and 2.8 at a position exceeding 9 mm from the inner surface Micron. In this filter, the various fabric dimensions are bonded to each other at the contact point by the melting action of the component with a lower melting point, forming a three-dimensional solid structure. Even if the filter hits the table, it will not be deformed. The filtration accuracy of this susceptor is 2.5 microns, the pressure resistance is 6.8 kg / cm2, and the filtration life is 27 minutes. No foaming was observed in the early stage of filtration. Comparative Example 1 Using the spray-melting method, using the spinneret device used for spray-melting spinning, spray-melting '----------.--- ^ ----------- installed ------ Subscribe ------- Line (please read the precautions on the back before filling in this page) This paper ruler and selection use China National Standard (CNS) A 4 specifications (210 X 297 mm ) 20 82.3. 40,000 A6 B6 211592 V. Description of the invention (19) Spinning nozzles for spinning (nozzle diameter: 0.3 mm, number of nozzles: 5 0 1) lined up as a core component of polypropylene (melt Flow rate (MFR, 230 ° C) · 180 g / 10 min, melting point: 1 6 4 ° C) is extruded at a spinning temperature of 2 8 0 ° C, the extrusion rate is 1 2 0 g / In minutes, the extrudate from the nozzle is blown onto the mesh conveyor belt with compressed air at a temperature of 380 ° C to obtain an ultrafine fiber web. The compressed air is fed into the spinning nozzle successively, and the pressure is gradually reduced from the initial pressure of the gravity acceleration of 3.2 kg / cm2, and the final pressure is 0.6 kg / cm2. In the same manner as in Example 1, the fiber web was heated to 190 ° C with a far-infrared light heater, while being moved by a fiber web conveyor belt, and then the fiber web was wrapped around a round stainless steel tube (Outer diameter: 30 mm), and the resulting fiber web was allowed to cool at room temperature. Then, the stainless steel tube was taken out, and the fiber web was cut into a length of 250 mm to obtain a cylindrical filter (inner diameter: 30 mm, outer diameter: 60 mm, length: 2 50 mm). The thickness of the filter The average diameter of the fibers obtained by the various parts in the direction: 3.4 microns on the inner surface, 8.2 microns at 5 mm from the inner surface, 15 microns at 10 mm from the inner surface, and 2 2 on the outer surface Micron. The fiber web itself will be blocked due to the melting and deformation of the fiber, so the filter is very hard. This filter did not observe blistering in the early stages of filtration. The filtration accuracy of this filter is 3.2 microns, the pressure resistance is 6.5 kg / cm2, and the filtration life is very short, 5 minutes. This paper scale is applicable to China B Standard (CNS) Grade 4 specifications (210 X 297 male 21-82.3. 40,000; · ----------- ^ ---.-------- -Installed ------. 玎 ------ married (please read the precautions on the back before writing this page) Printed by the Ministry of Economic Affairs Central Bureau of Standardization's shellfish consumer cooperatives A6 printed by the cooperative < > .11592_Be_ V. Description of the invention (2〇) Comparative Example 2 The same conditions as in Comparative Example 1 were used, but the pressure of the compressed air used was fixed at 3.2 kg / cm 2 by gravity acceleration to produce a garden tube Shaped Luci. The filter is composed of a composite dimensional dimension with an average diameter of 0.9 microns. The average diameter of the fibers at each point on the filter is 0.9 microns. The inner diameter of the filter is 30 mm and the outer diameter is 60 mm. The length is 2 500 m. The filtration accuracy of this filter is 0.9 microns, the pressure resistance is 6.5 kg / cm2, and the filtration life is very short, 10 minutes. Comparative Example 3 The same conditions as in Comparative Example 1 were used, but the pressure of the compressed air used was fixed at 0.6 kg / cm 2 and accelerated by gravity to obtain a cylindrical filter. This filter is composed of a composite dimension with an average diameter of 7.3 microns. The average diameter of the fibers at each point on the filter is 7.3 microns. The inner diameter of the filter is 30 mm, the outer diameter is 60 mm, and the length It is 2 5 0 Bom. 0 微米。 The pressure resistance of this filter is 6.05 kg / cm2, the filter life is 50 minutes, but its filtration accuracy is not good, is 7.0 microns. Reference Example 1 A polypropylene fiber web having an average fiber diameter of 1.3 microns was prepared by a melt-spinning method, and the fiber web was wound around a reinforced porous cylinder to form a commercially available filter (inner diameter: 30 mm, outer diameter: 60 mm, length: 25 mm), and then determine its properties. This filter did not observe the occurrence of blistering in the early stage of filtration. It is suspected that ---- · 1 .----—— I .---.--------—— 装 丨 --- -、 玎 ------ Φ · (Please read the precautions on the back before writing this page) The size of the clothing paper is in accordance with the Chinese National Standard (CNS> A 4 specifications (210 X 297 g; * ·) -22 -82.3. 40,000 211592 A6 B6 V. Description of the invention (21) The average diameter of the dimension is not large, and its filtering accuracy is not good, which is 9.0 microns: its pressurization resistance is low, which is 1.8 kg / cm2, filtering It has a short life span of 8 points. The reason for this is that the fibers are almost completely fixed by friction. The holes in the filter will open due to water pressure, which will reduce the filtration accuracy or the filter itself will be deformed. Application of the present invention: According to the filter of the present invention, since the ultra-fine composite fibers are manufactured by the spray-melting method, and the diameter of the fiber is changed along the thickness direction of the filter, the size of the space between the inside and outside of the filter A relatively large change, so its filtration accuracy is better, and the over-rate life is also longer. On the other hand, because the fiber uses the melting point The low component adhesion results in a three-dimensional structure that is bonded to each other, so there is no need to use reinforcement materials. Even during pressure filtration, the pores of the filter will not open, so the pressure resistance is better. It can be accurately filtered at the ear. In addition, because there is no need to use the oily agent commonly used in dimension maintenance, the filtrate will not be contaminated by the oily agent, so this reducer can be safely used in the range of food processing. It can also be used in the scope of electronic instruments. ---- Bu: -------- | Bu | -_Bu --------- install ------ order ----- -Line,-. (Please read the precautions on the back before writing this page) The paper standard printed by the Employee Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs is compliant with China National Standard (CNS) Grade 4 (210 X 297 mm) -23-82.3. 40,000