JPS61119706A - Spinning die - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides composite fiber raw material yarn (OOR1pO8ltf3t
extt+eyerns). More specifically, the present invention relates to a bonded multifilament yarn,
It particularly relates to spandex yarns and spinnerets for obtaining such yarns.

Smith, U.S. Pat. No. 3,094,374 and Hunt, U.S. Pat. No. 3,428,711, describe methods for making bonded spandex filaments. In the preferred embodiment described by Smith, the thread contains individual filaments that are attached to each other to form a single group of filaments. The Hunt patent, which discloses preferred methods for making filaments in Examples 1 and 2, is incorporated herein by reference.

A typical spinneret used for the production of light denier spandex has two rings, an outer ring and an inner ring with orifices divided into groups, each group containing four holes. It consists of The spacing between the holes in each group is the same whether the group is in the inner or outer ring.

High spinning productivity is achieved by spinning cells.
l! ) is achieved by increasing the number of filament groups per. The greater the number of groups, the greater the tendency for filament migration between groups and the greater the difference in drying environment between inner and outer groups. This results in different loading force levels, which negatively affects the appearance of the yarn or fabric.

A novel spinneret in which the orifice spacing in the rings of the outer group is substantially smaller than that of the inner ring essentially eliminates force differences between the groups. Shown. Additionally, filament movement is reduced, thereby increasing yield.

DETAILED DESCRIPTION OF THE INVENTION Referring to FIG. 1, a conventional spinneret 10 selected for illustration includes a plate 12 having an outer ring 14 and an inner ring 16 each consisting of groups of orifices 14a 116a. The individual orifices within the groups in the outer and inner rings are numbered 18 and 20, respectively. The circumferential and radial spacing d between the orifices of each group 14a, 16a in the outer and inner rings 14.16 is the same for both the outer and inner rings.

For comparison, a spinneret of the present invention is shown in FIG. 2, where like numbers are used for like elements. More specifically, the spinneret 10' has orifices 14a', 1
It includes a plate 12' having an outer ring 14' and an inner ring 16- consisting of groups 6a-.

As before, each individual orifice is shown as 18' and 20' in the outer and inner rings, respectively.

Circumferential and radial spacing between orifices in the ring 14-middle group of the outer group d17J1. bidl
are the same for each group in the outer ring. In the illustrated preferred embodiment, d1 is greater than d2. However, each of the spacings d□, dl is smaller than the spacing d3 between orifices in group 168'.

Although the preferred embodiment shows dl greater than dt, spinnerets in which dl and dI are equal or dl is less than dl work equally well.

Additionally, although the preferred embodiment shows four orifices in each group, even if there are three orifices in each group, the spacing between the orifices within a group in the outer ring will vary in the inner ring. works equally well as long as the spacing between the orifices in the group is smaller than the spacing between the orifices in the group.

The loading force (Ta2O) is the stress at 300% elongation. Five samples of spandex yarn, each 5" long, are tested on a 2" gauge length using an Instron tensile tester at a strain rate of 1000% per minute.

The value of the stress in Durham (g) at 300% elongation is recorded as the loading force.

The spinneret described in connection with FIG. 2 essentially eliminates loading force differences between yarn lines or groups of coalesced filaments.

A spandex spinning solution prepared as described in Examples 1 and 2 of U.S. Patent No. 3,428,711@
It was extruded through a hole spinneret to form 16 coalesced yarn lines. The arrangement of holes in the spinneret is shown in FIG.

There are four groups of orifices per quarter of the spinneret, each group consisting of four holes.

The three groups form the outer ring by being equidistant from the center of the spinneret. The remaining groups are located between the center and outer rings. Within each group of orifices in the outer ring, the four holes are spaced approximately 0.20" (5,1u+) from each other. The hole spacing for the inner group orifices is 0.39
” (9.9mm).

The spinning solution was extruded at a rate of 6.2 pph to approximately 730 i
By winding at mpm, 16 40 denier 1llfts were obtained, each l! The fiber is four 10 pieces joined together.
It was made of denier filament. Among the 16 fibers, 12 are named outer ring fibers and 4 are named inner ring fibers.

Actual loading force (Ta2O) on inner and outer ring fibers! Table 1 shows a comparison with that of the product from a conventional spinneret in Example 2.

Example 1 was repeated using a conventional spinneret as shown in FIG. This spinneret has 64 holes arranged in 16 groups of 4 holes. Groups of 12 form the outer ring and groups of 4 form the inner ring. The spacing between orifices in each group is 0.39″ for both outer and inner ring groups (
9.9m5).

The loading forces on the inner and outer ring fibers are shown in Table 1.

Set-18'LLtL(Ta2O)q Example 1 Example 2
Inside 15,89
15.77 outside
15,90 16.39 difference
0.06
4. A 24-thread, 40-denier spandex fiber was produced using a 96-hole spinneret. The 96 holes are divided into 24 groups of 4 holes each.

There are 16 outer groups and 8 inner groups.

Hole-to-hole spacing is 0.3 for both inner and outer thread lines.
2". The solution is fed at a rate of 10.01) l) h and wound up at about 814 impm.

The load force (Ta2O) on the outer thread is 16.39g, and the tensile load force (Ta2O) on the inner thread is 15.94
o, and the difference is 0.450.

Example 3 was repeated using a 96-hole spinning rod of the present invention with a spacing of 0.35''.

The load force (Ta2O) on the outer thread was 16.89 g, and the load force on the inner thread was 16.94 g. The difference of 0.05o in the loading force (Ta2O) of each yarn line shows a large degree of improvement compared to IIH of Example 3.

[Brief explanation of the drawing]

FIG. 1 shows a top view of a prior art spinneret used for the production of spandex. FIG. 2 shows a top view of a preferred embodiment of the spinneret of the present invention for the production of spandex. Patent Applicant Dupont de Nimois & Co., Ltd.

Claims (1)

[Claims] 1. A group characterized in that the spacing between the orifices in each group in the ring of the outer group is smaller than the spacing between the orifices in each group in the ring of the inner group. A spinneret for the production of spandex filaments, consisting of a plate having an outer ring and an inner ring of orifices, each group consisting of a plurality of orifices spaced apart from each other. 2. The spinneret of claim 1, wherein there are 4 groups of orifices in the inner group of rings and 12 groups of orifices in the outer group of rings. 3. The spinneret of claim 2, wherein there are four orifices in each group. 4. There are four orifices in each group, and the spacing between the orifices in each group in the outer ring is defined as circumferential and radial spacing. Spinneret. 5. The spinneret of claim 4, wherein the circumferential spacing is greater than the radial spacing. 6. The spinneret of claim 4, wherein said circumferential spacing is equal to said radial spacing. 7. The spinneret of claim 4, wherein the circumferential spacing is less than the radial spacing.