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Sea-island composite fiber, ultrafine fiber, and composite die

A composite fiber and composite spinning technology, which is applied in spinneret assemblies, conjugated synthetic polymer rayon, fiber processing, etc. Head or fall off, stress distribution suppression, high productivity effect

Active Publication Date: 2012-10-03
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, it does not take into account the protection of the so-called composite polymer stream when the polymers discharged from the distribution holes and merged form a composite stream and are compressed and discharged.

Method used

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  • Sea-island composite fiber, ultrafine fiber, and composite die
  • Sea-island composite fiber, ultrafine fiber, and composite die
  • Sea-island composite fiber, ultrafine fiber, and composite die

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0178] Polyethylene terephthalate (PET1 Melt viscosity: 120 Pa?s, Toray Co., Ltd. T301T) as the island component, and 5.0 mol% of sodium isophthalate 5-sulfonate as the sea component were copolymerized The PET (copolymerized PET1 melt viscosity: 140Pa?s A260 manufactured by Toray Co., Ltd.) was melted at 290°C, measured, and poured into the assembly figure 2 The spin pack of the composite spinneret shown discharges the composite polymer stream from the discharge orifice. It should be noted that four measuring plates are stacked, and the flow path is set in such a way as to expand downstream, and the sea component and the island component are measured step by step through the orifice (φ0.4 L / D=1.5) in each measuring plate. polymer. In addition, 10 distribution plates are stacked, and a flow channel for distributing a fine polymer flow in the fiber cross-sectional direction is provided. 1000 distribution holes for the island components are perforated on the distribution plate...

Embodiment 2～4

[0183] From the method described in Example 1, except that the composite ratio of the sea / island component is changed stepwise to 20 / 80 (Example 2), 50 / 50 (Example 3), and 70 / 30 (Example 4) , implement according to embodiment 1. The evaluation results of these island-in-the-sea composite fibers are shown in Table 1. Similar to Example 1, the circumscribed circle diameter and shape homogeneity of the island components were excellent, and there was no change (◯) even after 72 hours. The results are shown in Table 1.

[0184] [Table 1]

[0185]

Embodiment 5

[0197] In addition to using polyethylene terephthalate (PET2 Melt viscosity: 110Pa?s, Toray Co., Ltd. T900F) as the island component, 8.0 mol% of 5-sodium sulfoisophthalate is copolymerized as the sea component. PET (copolymerized PET2 melt viscosity: 110 Pa?s), except that the draw ratio was 4.0 times, all were implemented as in Example 1. The sea-island composite fiber can be stretched at a high ratio, so that the strength can be relatively increased. Other evaluation results are shown in Table 3. As in Example 1, the circumscribed circle diameter and shape homogeneity of the island components were excellent.

[0198] In addition, the manufacturing method of the copolymerized PET2 used as a sea component in Example 5 is as follows.

[0199] Add 8.7 kg of dimethyl terephthalate, 1.2 kg of dimethyl isophthalate-5-sodium sulfonate (equivalent to 8 mol% relative to the total acid content of the obtained polymer), 5.9 kg of ethylene glycol, 50 g of lithium acetate was heated to...

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Abstract

Disclosed is a sea-island composite fiber in which the island component is ultrafine fibers having a noncircular cross-section, the ultrafine fibers being uniform in the degree of non-circularity and in the diameter of the circumscribed circle. The sea-island composite fiber comprises an easily soluble polymer as the sea component and a sparingly soluble polymer as the island component, and is characterized in that the island component has a circumscribed-circle diameter in the range of 10-1,000 nm, a dispersion in circumscribed-circle diameter of 1-20%, a degree of non-circularity of 1.2-5.0, and a dispersion in the degree of non-circularity of 1-10%.

Description

technical field [0001] The present invention relates to a sea-island composite fiber. Even if the cross-sectional shape of ultrafine fibers produced from the sea-island composite fiber is irregular, the shape is excellent in homogeneity. Background technique [0002] Fibers made of thermoplastic polymers such as polyester and polyamide are widely used not only for clothing, but also for indoor and vehicle interiors and industrial applications due to their excellent mechanical properties and dimensional stability, and their industrial value is extremely high. However, as the uses of fibers are becoming more diverse, the required characteristics are also becoming more diverse, and there are cases where existing polymers cannot cope. In contrast, molecular engineering of polymers from scratch presents cost and time concerns. Therefore, it is sometimes chosen to develop a composite fiber that combines the properties of multiple polymers. In such a composite fiber, by coating t...

Claims

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Application Information

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IPC IPC(8): D01F8/04D01D4/06D01D5/30D01D5/36
CPCD01F8/04D01D5/30D01D5/36D01D4/06D01D5/253Y10T428/2931Y10T428/2976Y10T428/249921Y10T442/614Y10T442/622Y10T442/626Y10T442/64D01D5/06D10B2331/02D10B2331/04
Inventor 增田正人木代明船越祥二船津义嗣水上诚二
Owner TORAY IND INC
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