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CA-3139273-C - APPARATUS AND METHOD FOR MANUFACTURING FIBROUS WEB, FIBRILLA FIBER AGGREGATE, OR NONWOVEN FABRIC, AND FIBROUS WEB, FIBRILLA FIBER AGGREGATE, OR NONWOVEN FABRIC MANUFACTURED THEREBY

CA3139273CCA 3139273 CCA3139273 CCA 3139273CCA-3139273-C

Abstract

The present invention relates to an apparatus for manufacturing a fibrous web, a fibrilla fiber aggregate, or a nonwoven fabric by using a woven fabric, a method for manufacturing a fibrous web, a fibrilla fiber aggregate, or a nonwoven fabric by using the apparatus, and a fibrous web, a fibrilla fiber aggregate, or a nonwoven fabric manufactured by the method, especially, a fibrous web, a fibrilla fiber aggregate, or a nonwoven fabric for use in a hemostatic agent or an anti-adhesive agent.

Inventors

  • Hye Sung Yoon
  • Jin Su Kim

Assignees

  • SAMYANG HOLDINGS CORPORATION

Dates

Publication Date
20260505
Application Date
20190612
Priority Date
20190524

Claims (8)

  1. CLAIMS 1. A method for preparing fibrous web, fibrillar fiber aggregate or nonwoven fabric, the method comprising a step of passing woven fabric starting material comprising oxidized regenerated cellulose through a machine to process into fibrous web, the machine comprising a feed roller; a cylinder equipped with a flat bar on a surface thereof; a doffer; and a stripper; wherein teeth are formed on surfaces of the feed roller, the flat bar, the cylinder, the doff er and the stripper, and wherein the woven fabric is fed via the feed roller into the cylinder, passes between the flat bar and the cylinder, and then passes through the doffer and the stripper sequentially.
  2. 2. The method of Claim 1, wherein: the teeth formed on the surface of the feed roller satisfy one or more conditions of a height of from 2.0 to 6.0 mm, an angle of from 50 to 85°, a thickness of from 0.5 to 2.5 mm, a number of from 3 to 20/inch; the teeth formed on the surface of the cylinder satisfy one or more conditions of a height of from 2.0 to 6.0 mm, an angle of from 50 to 85°, a thickness of from 0.5 to 2.5 mm, a number of from 3 to 20/inch; the teeth formed on the surface of the flat bar satisfy one or more conditions of a height of from 0.5 to 5.0 mm, an angle of from 50 to 90°, a thickness of from 0.5 to 2.5 mm, a number of from 3 to 20/inch; and the teeth formed on the surface of the doffer satisfy one or more conditions of a height of from 2.0 to 6.0 mm, an angle of from 30 to 80°, a thickness of from 0.5 to 2.5 mm, a number of from 3 to 20/inch; and Date Re9ue/Date Received 2024-01-26 5 3. 10 4. 5. 6. 20 7. the teeth formed on the surface of the stripper satisfy one or more conditions of a height of from 2.0 to 6.0 mm, an angle of from 30 to 80°, a thickness of from 0.5 to 2.5 mm, a number of from 3 to 20/inch.
  3. The method of Claim 1 or 2, wherein: the feed roller is operated at a speed of from 0.1 to 1 mpm (meter per minute); the cylinder is operated at a speed of from 100 to 350 rpm (revolution per minute); and the doff er is operated at a speed of from 2 to 4 mpm (meter per minute).
  4. The method of any one of Claims 1 to 3, further comprising a step of calendaring a plurality of the prepared fibrous webs to prepare fibrillar fiber aggregate.
  5. The method of any one of Claims 1 to 3, further comprising the steps of: combining a plurality of the prepared fibrous webs in a non-weaving manner; and calendaring the combined plurality of the fibrous webs to prepare nonwoven fabric.
  6. The method of any one of Claims 1 to 5, wherein the prepared fibrous web has a density of from 10 g/m2 to 60 g/m2 .
  7. The method of Claim 4, wherein the prepared fibrillar fiber aggregate has a density of from 100 g/m2 to 600 g/m2 .
  8. 8. The method of Claim 5, wherein the prepared nonwoven fabric has a density of from 50 g/m2 to 600 g/m2 . 21 Date Re9ue/Date Received 2024-01-26

Description

APPARATUS AND METHOD FOR MANUFACTURING FIBROUS WEB, FIBRILLA FIBER AGGREGATE, OR NONWOVEN FABRIC, AND FIBROUS WEB, FIBRILLA FIBER AGGREGATE, OR NONWOVEN FABRIC MANUFACTURED THEREBY TECHNICAL FIELD The present invention relates to a machine for preparing fibrous web, fibrillar fiber aggregate or nonwoven fabric by using woven fabric, a method for preparing fibrous web, fibrillar fiber aggregate or nonwoven fabric by using the machine, and fibrous web, fibrillar fiber aggregate or nonwoven fabric prepared by the method, in particular, fibrous web, fibrillar fiber 10 aggregate or nonwoven fabric for hemostatic or antiadhesive use. BACKGROUND ART N onwoven fabric refers to a fabric product prepared by entangling various fibers according to their interacting properties to fonn a web in a sheet (cloth) fonn and combining 15 them by mechanical and physical means, without passing through processes of twining, weaving, knitting, etc. A method for preparing nonwoven fabric generally consists of three (3) procedures of web formation - web combination - processing, etc. The web formation is a procedure of making a web by dispersing and stacking fibers on a conveyer with a thickness as unifonn as 20 possible. The web combination is a procedure of entangling or bonding fiber aggregate by giving suitable strength to provide shape stability, in order not to let the fibers separated. The processing is a procedure of completing nonwoven fabric through dyeing or other process necessary for the final use. Nonwoven fabric preparation is divided into wet method and dry method according to 1 the manner of web fannation. The wet method and the dry method are distin,6>uished according to whether the web is fanned in a wet condition or in a dry condition. That is, in the dry method, web is fanned from fibers in air, whereas in the wet method, fibers are dispersed in liquid to obtain web. As such, web formation methods are sorted according to the medium in 5 which the fibers are dispersed, i.e., air or liquid. Or, nonwoven fabric may also be divided into long fiber nonwoven fabric and short fiber nonwoven fabric according to the kind of fiber. Oxidized regenerated cellulose (ORC) is a known absorptive hemostatic material. There are many disclosed methods for forming various types of hemostatic products based on oxidized cellulose (OC) in powder, woven fabric, nonwoven fabric, knitted fabric, or other form 10 or combination thereof. The presently used hemostatic dressing for affected part comprises knitted or nonwoven fabric comprising oxidized regenerated cellulose (ORC). Korean Patent Laid-open Publication No. 2013-0101109 discloses a method of manufacturing a resorbable hemostatic nonwoven dressing, comprising the steps of a) providing cellulose yam having filaments of minimal twist; b) fanning a multi-yam, single feed circular 15 knitted cellulose fabric having minimal twist; c) scouring the cellulose fabric; d) oxidizing the scoured fabric; e) pliabilizing the oxidized fabric; t) de-knitting the pliabilized fabric to fann a continuous strand having a crimp from about 2.0 crimps/cm (5 crimps/inch) to about 4.7 crimps/cm ( 12 crimps/inch); g) cutting the continuous strand to fann staples, said staples having length from about 3.8 to about 10.8 cm (about 1 ½ to about 4¼ inches); h) carding the staples into 20 a carded batt; i) needle-punching and three-dimensionally entangling the carded batt to fonn a single layer non-woven felt. However, the above method has a problem that the manufacturing process is long and complicated because it comprises the steps of pliabilizing the oxidized fabric, de-knitting the pliabilized fabric to fonn a continuous strand, and cutting the continuous strand to fonn staple 2 fibers in a specific length. In addition, most of machines generally used for manufacturing fibrous web, nonwoven fabric or the like use, as raw materials tufts of fibers scrapped into short fibers already, and a method for manufacturing fibrous web, nonwoven fabric, etc. in a short time by feeding the 5 fabric directly and conducting the cutting and combing simultaneously has not been known yet. In particular, according to the characteristics of the machine for manufacturing fibrous web, nonwoven fabric, etc., the physical properties of the fanned fibrous web and nonwoven fabric change sensitively. The physical properties of the fanned fibrous web and nonwoven fabric are detennined even by slight difference in operation speed of each component, as well as 10 by the order of combining the components, existence or absence of tooth in each component of the machine, physical features of the tooth such as shape, length, angle, arrangement, etc. Thus, it is needed to develop a machine capable of manufacturing good fibrous web and nonwoven fabric with optimized combination of components and operating condition, and a fibrous web and nonwoven fabric manufactured by using the machine and having good hemostatic or 15 antiadhesive effect. CONT