Patent ID: 11920259
Assignee: ZHEJIANG ALMENG NEW MATERIAL TECHNOLOGY CO., LTD.
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC D  Y | IPC D

Claim 2:
3. The method of preparing a washable flame retardant viscose fabric according to claim 2, wherein a method of preparing the flame retardant viscose yarn comprises the following steps:
(a) opening and cleaning processes: putting a flame retardant viscose on a round blow table to be grabbed, wherein a falling speed of a cotton catcher of a scutcher is 2 mm each time, a rotation speed is 960 r/min, a rotating trolley speed is 2.8 r/min, and a blade portion extending out of a rib is 2 mm, a catcher speed is 800 r/min, a fan speed is 950 r/min, a gauge of catcher and pedal roller is 12 mm, a lap roller speed is 12 r/min, a lap dry weight is 350 g/m, and a lap length is 30.9 m;
(b) carding process: a cylinder speed is 280 r/min, a licker-in roller speed is 590 r/min, a duffer speed is 15.8 r/min, a cover speed is 89 mm/min, a gauge of cylinder and licker-in is 7 mil, a gauge of feeding plate and linker-in is 20 mil, a gauge of cylinder and doffer is 4 mil, a gauge of cylinder and five points on the cover plate is 10 mil×9 mil×8 mil×8 mil×9 mil, and a dust removal knife has a height aligned with the frame, and the back of the knife is at an angle of 90° relative to the horizontal plane of the frame;
(c) drawing process: conducting a three passages drawing each using 7 cotton slivers and having a bell mouth of 3 mm, wherein a dry weight of a first-passage drawing is 17.5 g/5 m, a roller gauge is 12 mm×20 mm, and a mechanical drafting is 6.3 times, a rear zone drafting is 1.6 times; a dry weight of a second-passage drawing is 17.5 g/5 in, a roller gauge is 12 mm×20 mm, a mechanical drafting is 6.86 times, and a rear zone drafting is 1.4 times; a dry weight of a third-passage drawing is 17.5 g/5 m, a roller gauge is 18 mm×25 mm, a mechanical drafting is 6.86 times, a rear zone drafting is 1.3 times, and the third-passage drawing is detected as being within 4.5% using a USTER tester;
(d) roving process: a roving twist is 3.2 twists/10 cm, a roller gauge is 28 mm×38 mm, a rear zone drafting is 1.17 times, a nip gauge is 9 mm, a roving dry weight is 5.26 g/10 m, a mechanical drafting is 6.8 times, a front roller speed is 200 r/min, a wet weight is 5.63 g/10 m, a tex number is 563 tex, a twist coefficient is 76, a front roller diameter is 28 mm, and a number of pressing palm windings is 2;
(e) spinning process: a mechanical drafting multiple is 31.92 times, a roller gauge is 22 mm×41 mm, a rear zone drafting multiple is 1.18 times, a nip gauge is 3.5 mm, a front roller diameter is 27 mm, a front roller speed is 158 r/min; the prepared flame retardant viscose yarn has 10-20 counts, the twist is 480-710 T/m, and the twist direction is S.