JPS6335725B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a spinneret for sea-island composite fibers with excellent spinnability. Conventionally, sea-island type composite fibers in which a single fiber contains a plurality of filaments that are substantially continuous in the fiber axis direction have been effectively used as synthetic leather and textile materials for synthetic leather. Various spinnerets have been proposed for producing fibers. Such a cap is composed of at least two or more cap plates, has a flow path for the sea component between the upper and lower two caps, and is provided with a tubular body into which the island component is introduced from the upper part. Sea components are supplied from the slit-shaped holes provided around the periphery to form a core-sheath type primary composite flow, which is collected into one group and collected at the gathering part of the lower mouthpiece. It is obtained by spinning fibers from a spinning hole. In order to uniformly disperse a plurality of islands in one fiber and create internal pressure in such a die, it is preferable to arrange the tubular bodies into which the island components are introduced concentrically, but the polymer of the sea component does not have such an arrangement. The polymer is introduced sequentially from the outer circumference toward the circumference while forming a primary composite flow, but it has the disadvantage that the polymer becomes more difficult to flow toward the circumference. For this reason, if the operation is continued after the start of spinning, the polymer will no longer flow around the circumference within a short period of time, resulting in a defect in which the island components merge together. The present invention was obtained in order to eliminate these defects, and consists of the following configuration. That is, the present invention introduces an island component into a tubular body and supplies a sea component from a channel provided around the tubular body to form a core-sheath type first
In a spinneret for sea-island type composite fibers, which forms a primary composite flow, collects a plurality of primary composite streams into one group, and discharges them as one fiber, the island component tubular bodies are circular or polygonal. The cross-sectional area of the sea component channel grooves is arranged in multiple rows or more in a shape, and surrounds the island component tubular body at least in the innermost periphery, and further surrounds at least a part of the island component tubular body in the outer periphery. The present invention relates to a spinneret for sea-island composite fibers, characterized in that the cross-sectional area of the sea component channel grooves is larger than that of the sea component channel grooves. The present invention will be explained in detail below using drawings,
It goes without saying that the present invention is not limited only to the following embodiments. FIG. 1 is a partial sectional view of a spinneret for sea-island composite fibers according to the present invention. In Figure 1, island component A
is discharged through the introduction hole 7 provided in the No. 1 plate 1 and flows into the inside of the tubular body 8 implanted in the No. 2 plate 2. On the other hand, the sea component B is completely separated from the island component A by a seal (not shown), etc., and passes through the introduction hole 6 circumferentially bored on the outer periphery of the No. 1 plate 1 and the No. 2 plate 2. Ocean current path 9 configured between plate 2 and No. 3 plate 3
guided by. Next, the island component A that is metered in the sea component channel groove 10 formed between the island component tubular body 8 and the No. 3 plate 3 and flows out from the inside of the tubular body 8 is surrounded, and the core is formed in the channel 11. A sheath-shaped primary composite flow is formed. The composite flow is guided to a gathering part 12 provided in the No. 4 plate 4, and a plurality of core-sheath composite flows guided from other flow channels formed in the same manner are collected as one group and are discharged from the discharge hole 13. It is discharged to form a single sea-island composite fiber. Here, 5 is an annular ring provided in the space between the second plate 2 and the third plate 3. Figure 2 shows the X-
Although the X′-line cross section is shown, in this embodiment, the second
As shown in the figure, 36 tubular bodies 8 for one gathering part 12 of the No. 4 plate 4 are arranged concentrically in four rows and are collected as one group for discharge. As mentioned above, the flow of the sea component B to one gathering part in the ocean flow path 9 is the outermost row d of the tubular body 8 of the island component.
Then, while surrounding the inner circumferential arrays c, b, and a, the inner circumferential arrays proceed toward the center in this order. In this way, the sea component shows the above-mentioned flow, but there is a drawback in that the flow becomes more difficult towards the center of a group, and islands merge together. FIG. 4 is a cross-sectional view of the yarn showing a state in which the island components in the center have merged (the shaded area in the figure). In the arrangement of 36 islands as shown in the figure, merging occurs at the center of the cross section. The figure shows a state in which three islands have merged, which is called a three-island confluence. Confluence can occur between two islands or even four islands, but the number of confluences on each island also indicates the confluence state. In the above embodiment, the number of islands in one group is 36, but the problem of merging is that the islands are arranged on concentric circles, and if there are three or more islands, it will occur from the flow of ocean components, and 36 islands. It is not limited to. As mentioned above, confluence is caused by a lack of supply of sea components. The present invention solves this problem, and includes:
The cross-sectional area of the sea component channel groove surrounding at least the innermost island component tubular body within one group of the composite flow is
Rather, the objective can be achieved by arranging the cross-sectional area of the sea component channel groove which surrounds at least a portion of the island component tubular body on the outer periphery to be larger than that of the sea component channel groove. In the present invention, the cross-sectional shape of the sea component channel groove 10 shown in FIG. The shape may be a slit-like shape that intermittently surrounds the surface, a petal-like shape, a triangular shape, a polygonal shape, etc., and the shape is not particularly limited. In the present invention, the island component tubular bodies are arranged in a plurality of rows or more in a circular or polygonal shape, but a circular shape is preferred because it is practical. For example, in a circular arrangement, if the island component tubular bodies are located at the center of a concentric circle, even one island component tubular body is counted as one row (row a), and this is considered the innermost part of the concentric circle. 2 rows (row B), 3 rows (row C), and 4 rows (row d) as the outer circumference approaches the outer circumference.
Count as. In addition, if the island component tubular body is not located at the center, one is arranged at the innermost circumference on the concentric circle.
Count them as a column (column a), and sequentially count them as 2nd column (column b), 3rd column (column c), and 4th column (column d) toward the outer circumference. On the other hand, even in the case of a polygonal shape, as in the case of the circular shape, the innermost periphery is counted as the a column, and the outermost periphery is sequentially counted as the b column, the c column, and the d column. In the present invention, the effect of applying the island component tubular bodies to a plurality of rows or more, particularly three or more rows, is greater. In the present invention, the cross-sectional area of the sea component channel groove surrounding the island component tubular body in the innermost peripheral part a row, the outer peripheral part b row,
The relationship with the cross-sectional area of the sea component channel groove surrounding the island component tubular bodies in the c and d rows is determined by taking into consideration the viscosity and discharge amount of the sea component polymer used, and the size relationship (a≧b≧c
≧d) may be determined as appropriate. In the present invention, the cross-sectional area of the sea component channel grooves surrounding the island component tubular bodies arranged at least on the innermost periphery as described above is changed from It is preferable to increase the cross-sectional area of the component channel groove by 1 to 20%. This varies depending on the type of sea component polymer used, viscosity, discharge amount, etc., but if it is less than 1%, there is no effect and merging occurs as in the conventional case. On the other hand, if it exceeds 20%, the supply of sea components at the outer periphery decreases, and confluence at the outer periphery becomes more likely to occur. Therefore, it is necessary to select such a method that the discharge amount of the sea component is constant from the outer circumference to the innermost circumference. In addition, since machining the sea component channel grooves is quite difficult in terms of accuracy, it is actually more preferable to set the difference to about 5% or more and about 10%. FIG. 3 shows an example of a sea component channel groove surrounding the island component tubular body according to the present invention, and in the case of the slit shape shown in _{FIG .} This is a preferred embodiment because the cross-sectional area can be easily adjusted by changing the width. The present invention will be explained below using examples. Example 1 80 parts of polyethylene terephthalate with an intrinsic viscosity of 0.71 (value based on orthochlorophenol at 25°C) was used as the island component, and 1% benzene solution specific viscosity at 25°C was used as the sea component.
Weighed 20 parts of 1.975 polystyrene, melt-spun it at 285°C, and discharged it at a rate of 85 g/min (68 g/min for the island component and 17 g/min for the sea component) at 900 m/min.
I rolled it up. The nozzle used was of the form shown in FIG. The main conditions are as follows. Γ Sea component outer circumferential introduction hole - 46 holes Γ No. 4 plate discharge hole - 40 holes arranged in two concentric circles. Number of islands for Γ1 discharge hole - 36 Tubular body arrangement for Γ1 discharge hole (1 group) -
Arrangement in 4 concentric rows (see Figure 2) Γ sea component channel groove - slit groove (see Figure 3) Details of 4 row arrangement of tubular bodies

[Table] As a result, no merging occurred even after 10 days from the start of spinning. Comparative Example Spinning was carried out under the same conditions as in Example 1. however,
Each row of slit-like grooves has a long side of l ₁ 0.59 mm and a short side of l ₂ 0.1
All were set to be the same as mm. As a result, three two-island confluences occurred three days after the start of spinning. After 10 days of continuing spinning, there were 10 yarns with 2-island confluence, 3 with 3-island confluence, and 1 with 4-island confluence. This made it impossible to put it into practical use. In Example 1, the composite time sea component discharge fluctuation is
4.1%, but in the comparative example it was 9.1%, about 2%.
There was a large change in the number of times. As is clear from the above examples, the present invention has excellent effects in that it can prevent the occurrence of merging of island components, stabilize the quality, and significantly extend the spinning period.

[Brief explanation of the drawing]

Figure 1 is a schematic sectional view of a spinneret for producing sea-island composite fibers, Figure 2 is a sectional view taken along line X-X' in Figure 1, and Figure 3 is a sectional view taken along line Y-Y' in Figure 1. FIG. 4 is a schematic cross-sectional view of the thread showing the island merging state. 6: sea component introduction hole, 7: island component introduction hole, 8: island component tubular body, 9: ocean flow path, 10: sea component flow path groove,
11: Channel, 12: Gathering part, 13: Discharge hole.

Claims (1)

[Claims] 1. Guide the island component into the tubular body, supply the sea component from the channel provided around the tubular body to form a core-sheath type primary composite flow, and combine multiple primary composite streams into one group. In a spinneret for a sea-island type composite fiber, which is configured to aggregate into a single fiber and discharge it as a single fiber, the island component tubular bodies are arranged in plural rows or more in a circular or polygonal shape, and at least the The cross-sectional area of the sea component channel surrounding the island component tubular body is
1. A spinneret for sea-island type composite fibers, characterized in that the cross-sectional area of the sea-component channel groove surrounding at least a part of the island-component tubular body in the outer periphery of the spinneret is larger than that of the sea-component channel groove.