DD230030A1 - METHOD FOR THE PRODUCTION OF CELLULOSEREGENERATE FIBERS WITH BIN THICKENED CROSS SECTION - Google Patents

Abstract

The invention relates to the production of viscose fibers with a ribbon-like cross section of high strength and crimping. The aim and task is in particular the production of a mixed titre of such fibers which, together with preferably polyester or polyacrylonitrile fibers, produce a natural fiber effect in the textile fabric. The object is achieved according to the invention essentially by spinning less mature, unmated viscose with increased alkali content and modifier addition by specific slot nozzle combinations in a corresponding spin bath under defined drafting and stretching conditions.

Description

Title of the invention

Process for the production of cellulose regenerated fibers with a ribbon-shaped cross-section

Field of application of the invention

The invention relates to a method with apparatus for the production of viscose fibers with a ribbon-shaped cross section, which are characterized by high strength and crimp. These fibers, together with preferably polyester or polyacrylonitrile fibers, give a natural fiber effect in the textile fabric.

Characteristic of the known technical solutions

Methods are known for producing flat-section viscose fibers using slot dies. In order to maintain the Ouerschnittsform, the application of coagulation and regeneration accelerating Fällbäder is required. In order to produce crimped fibers under these conditions, using a slightly ripened viscose, a delay of 1 is selected, the amount of zinc sulphate in the precipitation bath is increased , or the combined yarn strands are either stretched directly by 5-35 % in a hot weak sulfuric acid bath , or the first stretched the air

by 5 to 20 % and then treated with hot water at a temperature of at least 70 ⁰ C de-energized, (see DD-PS 41 397)

The known methods each relate only to a specific titer range. The fiber strengths and the crimp are insufficient and do not meet the requirements imposed on effect fibers, especially in the processing industry.

Object of the invention

The aim of the invention is to produce viscose fibers with a ribbon-shaped cross-section of high strength and high crimp, preferably as a mixed denier, in a spinning process.

Explanation of the essence of the invention

The object of the invention is to achieve the formation of a specific ribbon-shaped fiber cross-section by combining defined technological parameters in the viscose composition and in the spinning and drawing process and to fix them so that high strengths and high crimp remain after complete regeneration. In particular, a mixed titer is to be spun by the use of special combination or component slot dies.

The object is achieved by spinning a viscose with a content of 6 to 9% by mass of cellulose, 6 to 9% by mass of sodium hydroxide and 32 to 38% by weight, based on alpha-cellulose, carbon disulfide in addition to sulfuric acid still 300-350 g / l Sodium sulfate and 5-12 g / l zinc sulfate containing spinning

bath at a temperature of 45 to 55 ⁰ C and then stretching the tow in a secondary bath with IO to 20 g / l sulfuric acid and a temperature of 90 to 93 ⁰ C.

According to the invention, using 4 geometrically different slot combinations in a spinner head with a number of different slots of a width-to-length ratio of 1:10 to 1:20, a slightly ripened / unmated viscose with a gamma value of 42 mm. 50 and an alkali ratio of 0.75 to 0.85 in a spin bath with 90 to 100 g / l sulfuric acid and the already indicated concentrations of sodium sulfate and zinc sulfate spun. The viscose customary modifiers or Modif ikatortnischenungen, eg of polyethylene glycols and monoamines or substituted higher amines in a concentration of 0.75 to 1.5 %, based on alpha-cellulose added, which significantly increase the crimp of the fiber. By adjusting a delay in the spinning bath of 1.30 to 1.50, the crimp of the resulting fiber is surprisingly also increased.

It is advantageous that for spinning a Mischtiters with a percentage distribution of the individual titers of 45 % to 1.0 tex

35 % to 1.4 tex

18 % to 3.0 tex 2% to 5.4 tex

a spinner is used with 4 slot combinations with 41 individual nozzles, in which the individual nozzles required for the Titerbereiche are distributed proportionately distributed as follows:

- 4 for 1.0 tex

- number of nozzles ig

- Number of holes

- Slot size 0.05 χ 0.350 mm

- hole distribution:

PCD no. Diameter in mm Number of holes 1 2 3 4 5 6

for 1.4 tex

- Number of nozzles

- Number of holes

- Slot size 0.05 χ 0.500 mm

- hole distribution:

PCD no. Diameter in mm Number of holes

3.5 9 4.5 12 5.7 15 6.8 18 7.9 20 9.0 23

1 3.5 7 3 21 χ 1.00 ram 2 4.95 35 5 • 18 3 5.3 0.05 7 15 in mm number of bores 4 7.65 9 11 4 5 9 PCD no. diameter 8th 7 for 3.0 tex 1 10 - Number of nozzles 2 14 - Number of holes 3 - Slot size 4 - hole distribution:

for 5.4 tex

- Number of nozzles 1

- Number of holes 15

- Slot size 0.09 χ 1.00 mm - · Hole distribution:

PCD no. Diameter in mm number of bores

1 9 9

2 6 6

In addition, the following specific slot areas can be assigned the following slot dimensions:

Titer area. Slot depth 1.0 tex 0.05 χ 0.35 mm

1.4 tex 0.05 χ 0.50 mm

3.0 tex 0.05 x 1.00 mm

5.4 tex. 0.09 κ 1.00 mm

Subsequently, a stretching in the secondary bath by 30-60 % is carried out to increase the fiber strength. A stress-free aftertreatment of the staple fiber to ensure the required elongation behavior follows suitably.

Ausführunqsbeispie1

The process according to the invention is explained in more detail in the following example:

An unmated viscose with 8.3 % cellulose, 6.3 % sodium hydroxide and 34.% carbon disulfide and a modifier blend of 0.75% by weight of dimethylamine and 0.5% by weight of polyethylene glycol, based in each case on alpha-cellulose, at a spinngamma value of 45

at a flow rate of 173.6 g / min through a die head containing the following single nozzles and slot dimensions:

- 19 individual nozzles with 97 holes of slot size 0.05 χ 0.350 mm

- 14 individual nozzles with 73 holes of slot size 0.05 χ 0.5GO mm

7 individual nozzles with 35 holes of slot size 0.05 χ 1.00 mm

1 single nozzle with 15 holes of slot size 0.09 χ 1.00 mm

For the rest, the device values correspond to those specified in point 2 of the invention claim.

The viscose passes into an aqueous precipitation bath with the composition 100 g / l sulfuric acid, 350 g / l sodium sulfate, 7.5 g / l zinc sulfate at a temperature of 52 ⁰ C.

The coagulated with a delay in the spinning bath of 1.36 and most regenerated tow is in a second bath containing 15 g / l sulfuric acid at a temperature of 96 ⁰ C stretched by 48 % , cut to mm lengths of fibers and de-energized as a flake treated. The spinning speed is 50 m / min. The spun fibers represent a blend titer consisting of 45 % titer 1.0 tex 35 % titer 1.4 tex

18 % titer 3.0 tex 2 % titer 5.4 tex.

  - 7 The individual titers have the following main characteristics

Titer fineness-related stretch Entangling (tex) Tear Dry (%) (mN / tex)

1.0 187 1.4 • 182 3.0 ISO 5.4 156

18 21

21 21

20 18

16 17

Claims (3)

invention claim 1. A process for producing cellulose regenerated fibers having a ribbon-like cross section by spinning a viscose containing 6 to 9% by mass of cellulose, 6 to 9% Hassel sodium hydroxide and 32-38% by mass, based on alpha-cellulose, carbon disulfide in sulfuric acid 300% 350 g / l sodium sulfate and 5-12 g / l zinc sulfate containing spin bath having a temperature of 45 to 55 ⁰ C and then stretching the tow in a secondary bath with 10 to 20 g / l sulfuric acid and a temperature of 90 to C, characterized in that 4 geometrically different slit combinations in a spinneret with a number of different slits of a width to length ratio of 1:10 to 1:20 at an alkali ratio of 0.75 to 0.35 of a slightly ripened, unmated viscose with a gamma value of 42 - 50 and at a sulfuric acid concentration of 90 - 100 g / l used in the spinning bath and the usual viscose modifiers or Modifik at concentrations of 0.75 to 1.5 %, based on alpha-cellulose, wherein a delay in the spinning bath of 1.30 to 1.50 and a draw in the secondary bath by 30 to 60 % are made. 2. Apparatus for carrying out the method according to item 1, characterized by 4 slot combinations in a spinning head with 41 individual nozzles, in which at a percentage distribution of the titre of 1.0 tex = 45 % 1.4 tex * »35 % 3.0 tex = 18% 5.4 tex = 2 % the individual nozzles on the spinning head are composed as follows: for 1.0 tex Number of nozzles ^ g · - Number of holes - Slot size 0.05 χ 0.350 mm - hole distribution: PCD no. Diameter in mm Number of holes 1 2 3 4 5 6 for 1.4 tex - Number of nozzles - Number of holes - Slot size 0,05 χ 0,500 mm - hole distribution: PCD no. Diameter in mm Number of holes 1 2 3 4 5 - 10 - ·> ''> Ι '? β * η for 5.4 tex   - Number of nozzles 1 - Number of holes 15 - Slot size 0.09 χ 1.00 mm - hole distribution: PCD no. Diameter in mm number of bores 1 9 9 - 2 6 6 3. Apparatus for carrying out the method according to item 1, characterized in that the following specific slot areas are assigned the following slot dimensions: Titerbereich Schlitzabmessunq 1.0 tex 0.05 χ 0.35 mm 1.4 tex 0.05 x 0.50 mm 3.0 tex 0.05 χ 1.00 mm 5.4 tex 0.09 χ I ₁ OO mm