KR20150099776A - 화학적 개질된 셀룰로스 섬유의 처리 - Google Patents

화학적 개질된 셀룰로스 섬유의 처리 Download PDF

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KR20150099776A
KR20150099776A KR1020157018450A KR20157018450A KR20150099776A KR 20150099776 A KR20150099776 A KR 20150099776A KR 1020157018450 A KR1020157018450 A KR 1020157018450A KR 20157018450 A KR20157018450 A KR 20157018450A KR 20150099776 A KR20150099776 A KR 20150099776A
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fibers
weight
web
fiber
water content
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웨인 리 본네핀
루시 루이사 발라미
사라 로에
데이비드 파선즈
게리 스토레이
조셉 톰슨
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컨바텍 테크놀러지스 인크
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Abstract

(i) 셀룰로스 섬유 또는 필라멘트를 수득하고 치환에 의해 셀룰로스를 화학적 개질하여 이의 흡수성을 증가시키는 단계; (ii) 단계 (i) 후 섬유를 물 및 최대 99 중량%의 수혼화성 유기 용매를 포함하는 혼합물에서 세척하는 단계; (iii) 7 중량% 이상의 수분 함량으로 섬유를 건조하는 단계를 포함하는 방법에 의해 수득되는 7 중량% 이상의 수분 함량을 갖는 화학적 개질된 셀룰로스 섬유 또는 필라멘트.

Description

화학적 개질된 셀룰로스 섬유의 처리{PROCESSING OF CHEMICALLY MODIFIED CELLULOSIC FIBRES}
본 발명은 화학적 개질된 셀룰로스 섬유 및 이로부터 부직포 섬유 웹을 제조하는 방법에 관한 것이다. 구체적으로는, 웹을 생산하기 위해 카딩 머신(carding machine) 상에서 카딩될 수 있는 화학적 개질된 셀룰로스 섬유에 관한 것이다. 이 섬유는 궁극적으로는 예를 들어 웹을 니들링 또는 교락시킴으로써 부직포로 처리될 수 있고, 이 부직포는 흡수성 개인 용품 또는 흡수성 의료품, 예컨대 상처 드레싱으로 사용하기에 적당하다. 화학적 개질된 셀룰로스 섬유 또는 화학적 개질된 섬유와 다른 비겔화(non-gelling) 섬유, 예컨대 비스코스 또는 Tencel 또는 다른 셀룰로스 섬유의 블렌드의 웹을 형성하기에 적당한 카딩 공정이 또한 기술된다.
흡수성 셀룰로스 섬유가 잘 공지되어 있다. 예를 들면, GB-A-2220881 및 GB-A-2094802에는 재생된 셀룰로스 섬유(비스코스 레이온 섬유)로부터 또는 면직물로부터 카르복시메틸 셀룰로스 섬유의 생산이 기술되어 있다. 또한, 더 높은 흡수성 및 강도의 카르복시메틸 셀룰로스 섬유가 용매 스펀(solvent-spun) 셀룰로스 섬유로부터 생산될 수 있다는 것이 공지되어 있다. 상기 섬유는 EP 0616650에 기술되어 있고 용매 스펀 셀룰로스 섬유와 강 알칼리 및 모노클로로아세트산 시약을 반응시킴으로써 제조된다. 또한, 셀룰로스 섬유의 대안적 화학적 개질이 가능하고 또한 셀룰로스 섬유의 흡수성을 증가시키는 효과를 갖는다는 것이 공지되어 있다. 셀룰로스 섬유는 예컨대 설폰화에 의해, 예를 들어 셀룰로스 골격 형성 에테르 연결을 구성하는 안히드로글루코스 모노머 상의 히드록실 기 중 하나 이상에서 알킬 설포네이트로의 치환에 의해 개질될 수 있다. 이러한 유형의 개질된 셀룰로스는 WO2012/061225에 기술된 불용성 형태 중 일부인 셀룰로스 설포네이트 또는 셀룰로스 알킬 설포네이트로서 공지되어 있다.
셀룰로스 섬유의 개질은 섬유의 흡수성 및 용해성을 결정하는 치환, 치환 정도에 의해 셀룰로스를 개질시키는 하나 이상의 시약에 섬유를 노출시키는 것이 필요하다. 치환 정도가 증가됨에 따라 개질되는 셀룰로스는 점점 더 가용성이 된다. 용해성이 증가함에 따라, 흡수성 또한 증가한다.
일부 응용예의 경우, 예를 들어 흡수성 겔화 상처 드레싱의 경우, 화학적 개질된 섬유는 불용성이 되어야 할 필요가 있고 상처액에 노출되었을 때 섬유 형태 중 일부가 유지되어 결과적으로 용해성과 흡수성 사이에서 밸런스를 찾는 것을 필요로 한다. 화학적 개질된 섬유가 토우, 필라멘트, 은, 얀 또는 스테이플 섬유, 직포, 부직포 또는 편물의 형태일 수 있다.
산에서 개질 및 중화가 일단 일어나면, 섬유는 세척되어 임의의 미반응된 알칼리, 클로로아세테이트, 알킬설포네이트, 다른 개질제 또는 임의의 부산물, 예컨대 염화나트륨 또는 글리콜산나트륨이 제거될 필요가 있다. 수성 워시(wash)는 일반적으로 초기에 바람직하게는 물과 수혼화성 유기 용매의 혼합물, 예컨대 물 및 IMS가 사용되고, 대부분의 워시는 유기 용매이다. 이 워시는 유기 히드록실 화합물, 계면활성제, 및/또는 산을 함유할 수 있다. 유기 히드록실 화합물은 하나 이상의 알콜성 히드록실 기 함유 화합물, 예컨대 에탄올, 메탄올 또는 또다른 저분자량 알콜 및/또는 화합물, 예컨대 에틸렌 글리콜 또는 프로필렌 글리콜이다.
최종 워시 또는 마감은 통상 높은 비율의 알콜, 예컨대 99% 산업용 알콜 및 1% 유화제 또는 100% 알콜을 포함한다. 세척 후, 섬유는 강제 통풍 건조 또는 복사열 건조에 의해, 예를 들어 EP 0680344에 기술된 바와 같이, 저온에서 건조된다.
개질 후 섬유에 실시되는 세척 단계(들)는 비교적 높은 비율의 유기 용매, 예컨대 산업용 알콜의 사용이 수반되기 때문에, 섬유의 건조는 방출되어 환경적 및 안전성 관점으로 관리되는 용매를 필요로 한다. 환경적 및 안전성 표준을 용이하게 만족할 수 있도록 세척 공정에 사용되는 유기 용매 비율을 감소시키는 것이 바람직할 것이다. 또한, 재료 비용 및 의무가 감소되기 때문에 더 낮은 비율의 유기 용매를 사용하는 것이 잠재적 비용 및 효율 면에서 장점이 된다.
본 발명자들은, 예를 들어 개질된 셀룰로스 섬유를 세척하는 데 사용되는 워시 리커(wash liquor) 중 유기 용매의 비율을 감소시키는 것이 섬유 기계, 예컨대 카딩 머신 상에서 처리하기에 덜 적당하게 하는 더 낮은 인장 강도를 갖는 섬유를 초래한다는 것을 발견하였다. 더 낮은 인장 강도는 더 높은 수준의 공기운반 린트 또는 더스트(플라이) 및 마감 직물로부터 더 많은 파손 섬유의 쉐딩(shedding)을 형성하는 카딩시 섬유 파손의 문제를 초래할 수 있다. 더 높은 수준의 플라이는 직물 생산 공정에서 증가된 클리닝 및 환경적 관리를 필요하게 하며 이는 결과적으로 비용을 증가시킨다. 또한, 제조 공정 동안 섬유가 직물로부터 드롭되는 경향으로 인해 공정에서 더 많은 낭비가 발생한다.
섬유 파손은 또한 섬유로부터 만들어진 부직포 및 카딩된 웹의 강도를 감소시키는 효과를 갖는 스테이플 길이에 역효과를 미칠 수 있다. 섬유 파손은 부직포 매트가 생산되지 않는 실패한 카드 공정을 초래하는 것이 가능하다. 더 약한 생산물은 드레싱의 완전성을 저하시킬 수 있기 때문에 상처로부터 제거하기 더욱 어려울 수 있다.
본 발명자들은 이하 섬유의 수분 함량의 제어된 관리에 의해 개질된 섬유에서 낮은 인장 강도의 문제를 완화시키는 것이 가능하다는 것을 발견하였다.
따라서, 본 발명은 섬유가 7 중량% 이상의 수분 함량을 갖도록 처리함으로써 제조되는, 횡방향(cross direction)으로 인장 강도가 1 cm 당 3 N(N/cm) 이상인 섬유의 화학적 개질된 셀룰로스 웹을 제공한다.
화학적 개질 공정의 일부로서 개질된 섬유의 세척 후 건조 공정을 제어함으로써, 또는 건조 후 7% 이상으로 섬유의 수분 함량을 증가시키도록 섬유를 컨디셔닝함으로써, 섬유의 수분 함량을 제어하는 것은, 예를 들어 카딩 머신 상에서 섬유가 웹으로부터 생산된 섬유로부터의 과량의 플라이 또는 쉐딩의 생성 없이 부직포 섬유 웹을 생산하도록 처리될 수 있는 포인트까지 섬유의 인장 강도를 증가시킨다. 바람직하게는, 섬유의 수분 함량은 화학적 개질 공정의 일부로서 개질된 섬유의 세척 후 건조 공정을 제어함으로써 11∼20%에서 유지된다.
바람직하게는, 인장 강도는 80∼120 gsm 범위에서 평량을 갖는 니들링된 웹 상에서 횡방향으로 측정된다.
따라서, 본 발명은, 추가 측면에서, 화학적 개질된 셀룰로스 섬유의 부직포 웹의 제조 방법으로서,
(i) 7% 이상의 수분 함량을 갖는 화학적 개질된 셀룰로스 섬유를 수득하는 단계;
(ii) 상기 섬유를 카딩하여 섬유의 부직포 웹을 만드는 단계
를 포함하는 방법을 제공한다.
섬유는 통상 워시 리커 내 유기 용매를 99 중량% 미만, 예컨대 95 중량% 포함하는 워시 또는 최종 린스를 사용하는 개질 공정으로부터 유도된 것이다. 수분 함량을 제어함으로써, 섬유는 직물 생산 플랜트의 환경 내 플라이 및 섬유 파선 문제를 완화시키면서 기존의 카딩 수단에 의해 직물이 제조되도록 하는 통합 형태로 처리될 수 있다. 통합 형태는, 예를 들어 얀, 은, 직포, 부직포 또는 편직물일 수 있다.
섬유가 섬유 기계를 사용하여 처리되었을 때, 섬유의 수분 함량이 너무 낮은 것으로 발견되는 경우, 개질된 셀룰로스 섬유의 수분 함량은 24시간 이상 동안 수분 풍부 환경에 섬유를 노출시킴으로써 증가된다. 대안적으로, 예컨대 카딩 및 니들링에 의해, 예를 들어 섬유 기계에 의해 섬유에 추가 처리를 실시할 때까지 섬유의 수분 함량이 7% 초과로 유지되도록 화학적 개질 공정의 종료시 섬유의 건조를 제어할 수 있다.
바람직하게는, 카딩된, 니들링된 섬유 웹은 3 N/cm 내지 25 N/cm, 더욱 바람직하게는 7 N/cm 내지 25 N/cm, 가장 바람직하게는 10 N/cm 내지 25 N/cm의 인장 강도를 갖는다.
카딩된, 니들링된 웹의 인장 강도는 5개의 견본을 25 mm x 75 mm의 크기로 컷팅함으로써 측정되고, 긴 치수가 테스트하고자 하는 방향이 되도록 한다. 인장 테스트는 50 mm의 게이지 길이(효과적인 테스트 직물 길이)에서 수행된다. 샘플의 한쪽 단부가 인장 테스트 기기의 상부 조우(jaw)에 고정되어 하부 조우에 매달리게 된다. 이후 샘플의 신장 또는 늘어짐이 없도록 조우를 밀착시켜 샘플을 고정시킨다. 크로스헤드 속도는 100 mm/분으로 설정하고 샘플은 끌어당겨서 파손시킨다. 인장 강도는 파손 힘을 샘플 폭(cm)으로 나누어 계산된다.
바람직하게는, 섬유 기계로 처리하기 전 섬유의 수분 함량은 7 중량%∼20 중량%, 더욱 바람직하게는 11%∼18%이다. 더욱 바람직하게는, 수분 함량은 11.5 중량%∼15 중량%이고, 가장 바람직하게는 12∼15 중량%이다. 12.5% 내지 15%의 수분 함량이 특히 바람직하고 15%가 가장 바람직하다.
용어 수분 함량은 컨디셔닝된 중량의 비율로서 섬유의 샘플에 함유된 (중량 기준 측정된) 수분의 양을 의미하고 건조 감량에 의해 측정된다.
섬유의 수분 함량은 기기 메뉴얼에 따라 조작된 수분 밸런스를 사용하여 건조 감량을 계산함으로써 측정된다. 편의상, 섬유 제조 공정 동안, 수분 함량의 비교 측정이 수분계, 예컨대 Aquaboy(TEMI)를 사용하여 이루어질 수 있다.
본 발명에서 용어 카딩은 섬유를 풀고, 세정하고 섞어서 추가 처리에 적당한 연속 웹 또는 은을 제조하는 기계적 공정을 의미한다.
본 발명의 추가 측면에서, 본 발명은 7 중량% 이상의 수분 함량을 갖는 화학적 개질된 셀룰로스 섬유를 제공한다.
본 발명은 이하 하기 실시예에 의해 예시된다.
실시예 1
가변 알콜 함량의 세척을 이용하여 제조된 건조된 개질 셀룰로스 섬유의 초기 수분 함량을 측정함으로써 일단 카딩되고 니들링된 섬유의 수분 함량 대 이의 인장 강도의 비교를 실시하였다. 이후 55∼60%의 상대 습도에서 24시간 동안 수분 분위기에서 섬유를 컨디셔닝함으로써 이 초기 수분 함량을 증가시키고 니들링된 직물의 인장 강도를 다시 측정하였다. 도 1에는 수분 함량을 증가시키는 수분 컨디셔닝 전후에 횡단(transverse)(횡) 방향으로 카딩된 니들링된 직물의 섬유 수분 함량 대 인장 강도가 도시된다.
그 결과, 섬유의 수분 함량은 생성된 카딩되고 니들링된 웹의 인장 강도에 영향을 미친다는 것이 확인되었다. 도 1의 표에서 컬럼 맨 앞의 IDA는 개질 공정의 일부로서 워시 리커에 사용되는 IDA(산업용 변성 알콜)의 비율을 지칭한다. 컬럼 맨 앞의 %는 섬유 내 수분%를 지칭하고 N/cm는 횡단 방향으로 생성된 카딩되고 니들링된 웹의 인장 강도를 나타낸다. 도 1로부터 알 수 있듯이, 워시 리커 중 IDA의 %의 감소는 컨디셔닝되지 않은 섬유로부터 만들어진 카딩되고 니들링된 웹의 인장 강도에 부정적 영향을 미친다. 또한, 상기 섬유의 수분 함량이 일단 11% 초과, 예컨대 12.5∼14%의 수분으로 상승하면, 카딩된 니들링된 웹의 인장 강도 값이 증가한다는 것을 확인할 수 있다.
실시예 2
은 함유 상처 드레싱의 인장 강도에 대한 수분 함량의 효과.
용매 스펀 셀룰로스 토우를 0.3 치환 정도로 개질하여 카르복시메틸셀룰로스를 형성하고, 유기산으로 pH를 5.5로 중화시킴으로써 드레싱을 제조하였다. 주로 유기 용매 중 이온 교환 공정에 의해, 예컨대 Ep1343510에 기술된 공정에 의해 1.2% 양이온성 은을 첨가하고, 광 안정화를 위해 염화나트륨 및 2-나트륨 EDTA 함유 유기 수용액으로 세척하고 대략 0.4% EDTA를 비말동반하였다. 이후 tween 20 및 벤제토늄 클로라이드(마감된 생성물 상에 0.135% 중량/중량 BeCl을 형성)를 포함하는 유기 용매 워시 함유 섬유 마감제로 세척한 다음 따뜻한 공기로 건조하고, 스테이플로 컷팅하고 카딩 및 니들 펀칭 공정에 의해 부직포 펠트로 처리하였다. 웹으로부터 드레싱을 크기에 맞춰 컷팅하고 광, 수분 및 증기 불투과성 열 밀봉된 호일 파우치에 포장하였다.
팩으로부터 드레싱을 제거한 후 각종 제어된 환경에 적용하였다.
제어된 환경
포장된 주위 환경, 사전 컨디셔닝 없이 테스트 됨
제로 습도: 실리카겔 흡습제 층 위에 3개 천공된 퍼스펙스 칸을 가진 정사각형 데시케이터에 보관, 최소 5일 동안 컨디셔닝됨
최소 6일 동안 25℃/60%RH
최소 6일 동안 30℃/65%RH
최소 6일 동안 40℃/75%RH
포장 개방 직후 샘플(포장된 주위 환경)을 테스트하였다. 다른 환경으로부터 제거된 샘플을 제거 동안 플라스틱 백에 밀봉한 후, 바로 테스트하였다. 플라스틱 백(또한, 상응한 제어된 환경으로 사전 컨디셔닝됨)을 테스팅 포인트때까지 샘플의 환경의 습도를 유지하는 데 사용하였다.
건조 감량( LOD )
설명 메뉴얼에 따라 조작된 Ohaus 수분 밸런스 MB23을 사용하여 샘플의 LOD를 측정하였다. 1 g 초과의 샘플 질량을 사용하였다. 칭량통에 맞게 샘플을 컷팅하여, 발열 부재로부터 충분한 간격을 갖도록 보장하였다. 110℃의 최대 온도 한계로 표준화된 방법을 사용하였다. 중단된 샘플 질량이 감소하였을 때 자동적으로 종점이 결정되었고 안정적이었다. 이러한 조건 하에서 직물은 타지않았다. 통상, 샘플은 10분 사이클로 처리되었다.
직물 두께(로프트(Loft))
Hampden Soft Materials Thickness Gauge, Model FMTml-4D, S/N 14082를 사용하여 샘플을 테스트하였다. 뱃치 당 6개 드레싱에 대해 직물 두께(때때로 로프트로 지칭됨)를 측정하였다.
직물 건조 인장 강도
리본 컷팅 다이 및 프레스를 사용하여 길이를 따라(기계 방향) 및 폭을 가로질러(횡단 방향) 2.5 cm x 7.5 cm 직사각형 스트립을 컷팅하였다. 표 1에 기술된 바와 같이 샘플을 컨디셔닝하였다. 100 mm/분의 일정한 분리 속도에서 50 mm 테스트 길이가 신장되었을 때 피크 힘 및 발생된 힘에 의한 신장을 기록하였다.
결과
[표 1]
Figure pct00001
건조 감량은 110℃에서 가열함으로써 제거될 수 있는 휘발성 물질 전부에 대한 합계이다. 이것은 에탄올, 물 및 어느 정도의 아세트산을 포함한다.
이 실시예를 위한 상기 특정 섬유의 경우, 텍스타일 실험은 본 발명에 따른 상처 드레싱에 사용되는 섬유가 대략 18∼20℃에서 42%∼50% RH로 성공적으로 텍스타일화될 수 있다는 것을 확인시켜주었다. 실험은 10.5% 내지 11.5% w/w 수분 함량을 가진 섬유가 효율적으로 카딩될 수 있다는 것을 시사한다.
결과는 인장 강도, 로프트 및 LOD가 모두 평형 수분 함량의 함수임이 확인되었다. 이 결과는 9% 초과의 수분 함량을 가진 섬유가 텍스타일화되어 본 발명에 사용하기에 적당한 드레싱을 제조할 수 있다는 것을 시사한다.
실시예 3
재료
이 연구에 2개의 겔화 섬유 유형을 사용하였다; 셀룰로스 에틸설포네이트(CES) 및 카르복시메틸 셀룰로스(CMC).
[표 1] 사용된 겔화 섬유의 요약
Figure pct00002
방법
BS EN 5079:1996에 기술된 바와 같이 카드 윈도우 상에 단일 섬유를 마운팅하였다. 추가적으로, 토우 번들을 제조하여 수분 함량을 평가하였다.
최소 16시간 동안 선택된 상대 습도에서 컨디셔닝되기 전에 1시간 동안 105℃에서 섬유를 오븐 건조하였다. 오븐 건조된 토우 번들(W1) 및 컨디셔닝된 토우 번들(W2)의 질량을 취하여, 하기 식 1을 사용하여 섬유의 수분 함량을 평가하였다.
식 1:
Figure pct00003
BS EN 5079:1996에 기술된 방법을 이용하여 컨디셔닝된 샘플의 단일 섬유 인장 강도를 시작하였다.
45% RH, 65% RH, 및 85% RH에서 섬유를 테스트하였다.
결과
표 2에서 확인되는 바와 같이, 45% RH 및 85% RH에서 컨디셔닝된 샘플보다 65% RH에서 컨디셔닝된 샘플에서 유의적으로 더 높은 (P≤0.05) 인장 강도가 확인되는 결과를 발견하였다.
[표 2]
Figure pct00004

Claims (43)

  1. 7 중량% 이상의 수분 함량을 갖는 섬유를 처리함으로써 수득되는, 횡방향(cross direction)으로 측정하였을 때 3 N/cm 이상의 인장 강도를 갖는 니들링된(needled) 섬유의 화학적 개질된 셀룰로스 웹.
  2. 7 중량% 이상의 수분 함량을 갖는 화학적 개질된 셀룰로스 섬유.
  3. 제1항 또는 제2항에 있어서, 11 중량%∼18 중량%의 수분 함량을 갖는 웹 또는 섬유.
  4. 제1항 또는 제2항에 있어서, 12 중량%∼15 중량%의 수분 함량을 갖는 웹 또는 섬유.
  5. 제1항 또는 제2항에 있어서, 15 중량%의 수분 함량을 갖는 웹 또는 섬유.
  6. 제1항 내지 제5항 중 어느 하나의 항에 있어서, 섬유는, 99 중량% 미만의 수혼화성 유기 용매를 포함하는 세척 조성물을 사용하는 세척 단계를 포함하는 화학적 개질 공정으로부터 수득되는 것인 웹 또는 섬유.
  7. 제1항, 제3항 내지 제6항 중 어느 하나의 항에 있어서, 3 N/cm∼25 N/cm의 인장 강도를 갖는 카딩(carding) 및 니들링에 의해 처리된 웹.
  8. 제7항에 있어서, 80∼120 gsm의 평량을 갖는 웹.
  9. 제7항 또는 제8항에 있어서, 7 N/cm∼25 N/cm의 인장 강도를 갖는 웹.
  10. 제7항 내지 제9항 중 어느 하나의 항에 있어서, 10 N/cm∼25 N/cm의 인장 강도를 갖는 웹.
  11. 화학적 개질된 셀룰로스 섬유의 부직포 웹의 제조 방법으로서,
    (i) 7% 이상의 수분 함량을 갖는 화학적 개질된 셀룰로스 섬유를 수득하는 단계;
    (ii) 섬유를 카딩 및 니들링하여 섬유의 부직포 웹을 제조하는 단계
    를 포함하는 방법.
  12. 제11항에 있어서, 섬유는, 99 중량% 미만의 유기 용매를 포함하는 조성물로 섬유를 세척하는 단계를 포함하는 화학적 개질 공정으로부터 수득되는 것인 방법.
  13. 제12항에 있어서, 세척 조성물은 95 중량% 미만의 수혼화성 유기 용매를 포함하는 것인 방법.
  14. 제12항 또는 제13항에 있어서, 세척 단계 후, 섬유는 7% 이상의 수분 함량으로 건조되는 것인 방법.
  15. 제12항에 있어서, 섬유는, 40% 이상의 상대 습도를 갖는 공기 중에서 섬유를 컨디셔닝하여 섬유의 수분 함량을 7% 이상으로 증가시킴으로써 수득되는 것인 방법.
  16. 제18항에 있어서, 상대 습도는 45%∼85%인 방법.
  17. 제18항 또는 제19항에 있어서, 상대 습도는 50%∼65%인 방법.
  18. 제11항 내지 제17항 중 어느 하나의 항에 있어서, 섬유는 11 중량%∼18 중량%의 수분 함량을 갖는 것인 방법.
  19. 제11항 내지 제18항 중 어느 하나의 항에 있어서, 섬유는 12 중량%∼15 중량%의 수분 함량을 갖는 것인 방법.
  20. 제11항 내지 제19항 중 어느 하나의 항에 있어서, 섬유는 14 중량%∼15 중량%의 수분 함량을 갖는 것인 방법.
  21. 화학적 개질된 셀룰로스 섬유의 부직포 웹의 제조 방법으로서,
    (i) 셀룰로스 섬유 또는 필라멘트를 수득하고 상기 셀룰로스를 치환에 의해 화학적 개질시켜 이의 흡수성을 증가시키는 단계; 다음으로
    (ii) 상기 섬유를 물 및 최대 99 중량%의 수혼화성 유기 용매를 포함하는 조성물로 세척하는 단계; 그리고 다음으로
    (iii) 상기 섬유를 제어된 분위기 하에서 7 중량% 이상의 수분 함량으로 건조하는 단계
    를 포함하는 방법.
  22. 제21항에 있어서, 세척 조성물은 95 중량% 미만의 유기 용매를 포함하는 것인 방법.
  23. 제21항 또는 제22항에 있어서, 웹을 니들링하여 상처 드레싱을 형성하는 추가 단계를 포함하는 것인 방법.
  24. 제23항에 있어서, 멸균 및 제어 환경 하에서 드레싱을 유지하는 파우치에 드레싱을 밀봉 및 멸균하는 추가 단계를 포함하는 것인 방법.
  25. 제21항 내지 제24항 중 어느 하나의 항에 있어서, 섬유는 11 중량%∼18 중량%의 수분 함량을 갖는 것인 방법.
  26. 제21항 내지 제25항 중 어느 하나의 항에 있어서, 섬유는 12 중량%∼15 중량%의 수분 함량을 갖는 것인 방법.
  27. 제21항 내지 제26항 중 어느 하나의 항에 있어서, 섬유는 14 중량%∼15 중량%의 수분 함량을 갖는 것인 방법.
  28. (i) 셀룰로스 섬유 또는 필라멘트를 수득하고 상기 셀룰로스를 치환에 의해 화학적 개질시켜 이의 흡수성을 증가시키는 단계;
    (ii) 단계 (i) 이후 상기 섬유를 물 및 최대 99 중량%의 수혼화성 유기 용매를 포함하는 혼합물에서 세척하는 단계;
    (iii) 상기 섬유를 7 중량% 이상의 수분 함량으로 건조하는 단계
    를 포함하는 방법에 의해 수득되는, 7 중량% 이상의 수분 함량을 갖는 화학적 개질된 셀룰로스 섬유 또는 필라멘트.
  29. 제28항에 있어서, 세척 조성물은 95 중량% 미만의 유기 용매를 포함하는 것인 방법.
  30. 제28항 또는 제29항에 있어서, 섬유를 카딩 및 니들링하여 상처 드레싱을 형성하는 추가 단계를 포함하는 것인 방법.
  31. 제30항에 있어서, 멸균 환경 하에서 드레싱의 수분 함량을 유지하는 파우치에 드레싱을 밀봉 및 멸균하는 추가 단계를 포함하는 것인 방법.
  32. 제28항 내지 제31항 중 어느 하나의 항에 있어서, 섬유 또는 필라멘트는 11 중량%∼18 중량%의 수분 함량을 갖는 것인 방법.
  33. 제28항 내지 제32항 중 어느 하나의 항에 있어서, 섬유 또는 필라멘트는 12 중량%∼15 중량%의 수분 함량을 갖는 것인 방법.
  34. 제28항 내지 제33항 중 어느 하나의 항에 있어서, 섬유 또는 필라멘트는 14 중량%∼15 중량%의 수분 함량을 갖는 것인 방법.
  35. 화학적 개질된 셀룰로스 섬유의 부직포 웹의 제조 방법으로서,
    (i) 셀룰로스 섬유 또는 필라멘트를 수득하고 상기 셀룰로스를 치환에 의해 화학적 개질시켜 이의 흡수성을 증가시키는 단계; 다음으로
    (ii) 상기 섬유를 최대 99 중량%의 유기 용매를 포함하는 조성물로 세척하는 단계; 그리고 다음으로
    (iii) 상기 섬유를 40% 이상의 상대 습도를 갖는 분위기 하에서 컨디셔닝하여 섬유의 수분 함량을 7% 이상으로 증가시키는 단계
    를 포함하는 방법.
  36. 제35항에 있어서, 세척 조성물은 95 중량% 미만의 유기 용매를 포함하는 것인 방법.
  37. 제35항 또는 제36항에 있어서, 컨디셔닝은 45%∼85%의 상대 습도를 갖는 공기 하에 있는 것인 방법.
  38. 제35항 내지 제37항 중 어느 하나의 항에 있어서, 상대 습도는 50%∼65%인 방법.
  39. 제35항 내지 제38항 중 어느 하나의 항에 있어서, 섬유는 11 중량%∼18 중량%의 수분 함량을 갖는 것인 방법.
  40. 제35항 내지 제39항 중 어느 하나의 항에 있어서, 섬유는 12 중량%∼15 중량%의 수분 함량을 갖는 것인 방법.
  41. 제35항 내지 제40항 중 어느 하나의 항에 있어서, 섬유는 14 중량%∼15 중량%의 수분 함량을 갖는 것인 방법.
  42. 제35항 내지 제41항 중 어느 하나의 항에 있어서, 섬유를 카딩 및 니들링하여 상처 드레싱을 형성하는 추가 단계를 포함하는 것인 방법.
  43. 제42항에 있어서, 멸균 환경 하에서 드레싱의 수분 함량을 유지하는 파우치에 드레싱을 밀봉 및 멸균하는 추가 단계를 포함하는 것인 방법.
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US11286601B2 (en) 2022-03-29
BR112015014816A2 (pt) 2017-07-11
JP2019065452A (ja) 2019-04-25
AU2018204434B2 (en) 2020-05-14
AU2013366038A1 (en) 2015-07-16
CN105008611A (zh) 2015-10-28
US20150354096A1 (en) 2015-12-10
MX2015007771A (es) 2015-09-04
CA2895896A1 (en) 2014-06-26
US20200299865A1 (en) 2020-09-24
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