Unlock instant, AI-driven research and patent intelligence for your innovation.

Process for production of polyester fiber for air-laid nonwoven fabrics

A technology of polyester fiber and manufacturing method, which is applied in the field of fibers for air-laid non-woven fabrics, which can solve the problems of reducing the filling pressure of the press-in crimping machine, instability of the crimping machine, and reduction of spinning volume, etc., and achieve the goal of passing through the screen Good stability, good texture evenness, and even curl effect

Inactive Publication Date: 2011-01-26
TEJIN FIBERS LTD
View PDF2 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the number of crimps of the fiber exemplified as an example is too small when the fineness of the fiber is small, so the filling pressure of the push-in crimper must be lowered.
Therefore, the crimp of the fiber tends to show uneven crimp close to no bending.
When the fineness of the fiber is large, the number of crimps of the fiber is set too large, so if the filling pressure of the push-in crimper is increased, the back pressure will increase, which will easily cause the crimper to be unstable.
For this disadvantage, the tow is heated with steam or the like before the crimping machine, thereby reducing the rigidity of the fiber and reducing instability
However, the curl degree of the fiber increases and the H / L becomes too high, so the screen passability deteriorates, not only the spinning amount decreases, but also there is a disadvantage that pill-shaped fiber lumps are likely to be generated

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] Use polyethylene terephthalate (PET) with IV = 0.64dL / g, Tg = 70°C, Tm = 256°C, melt it at 290°C, and use a known round-hole fiber spinning nozzle to spray Spinning under the conditions of output 0.15g / min / hole and spinning speed 1150m / min to obtain undrawn yarn. This undrawn yarn was stretched at a low ratio of 1.0 times in warm water at 90° C. higher than the glass transition temperature of PET by 20° C., and heat-treated to length. Next, after immersing the sliver obtained by heat treatment to length in an aqueous solution of an oil agent composed of potassium lauryl phosphate: polyoxyethylene-modified silicone = 80:20 (weight ratio), a press-type crimper is used Give 11 / 25mm mechanical curl. This sliver was dried at 135° C., and then cut to 10.0 mm. Measured in the state of the tow before cutting, the result is that the single yarn denier is 1.2dtex, the strength is 1.5cN / dtex, the elongation is 350%, CN=10.8 pieces / 25mm, CD=3.8%, CD / CN=0.35, CE=79%, 180°C dry he...

Embodiment 2

[0078] Change the ejection amount to 0.10g / min / hole, spin at a spinning speed of 1150m / min, stretch at a low magnification of 0.7 times in warm water at 90°C (implement overfeeding), and simultaneously perform length fixation A polyester fiber was produced under the same conditions as in Example 1 except for the heat treatment. The obtained single yarn denier is 1.3dtex, strength is 1.2cN / dtex, elongation is 370%, CN=9.7 pieces / 25mm, CD=3.3%, CD / CN=0.34, CE=85%, 180°C dry heat shrinkage -10.1% polyester. The quality of the air-laid web was evaluated using this polyester fiber, and the result was a grade 1, and the maximum spinning amount was 115 kg / hr.

Embodiment 3

[0080] Use a 15 mol% isophthalic acid copolymerized polyethylene terephthalate (PET I) with IV=0.64dL / g, Tg=65°C, Tm=215°C, melt it at 280°C, and use a known round The hole fiber spinning nozzle was spun under conditions of a discharge amount of 0.15 g / min / hole and a spinning speed of 1150 m / min to obtain an undrawn yarn. The undrawn yarn was stretched at a low ratio of 1.0 times in warm water at 90° C. higher than the glass transition temperature of PET I, which was 25° C., and heat-treated at the same time. Next, after immersing the sliver obtained by the fixed-length heat treatment in an aqueous solution of an oil agent composed of potassium lauryl phosphate: polyoxyethylene-modified silicone = 80:20 (weight ratio), use a press-type crimper to impart 11 pcs / 25mm mechanical curling. This sliver was dried at 110° C., and cut into a fiber length of 10.0 mm. Measured in the state of tow before cutting, the single yarn fineness of polyester fiber is 1.25dtex, the strength is 1...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
number of curlsaaaaaaaaaa
melting pointaaaaaaaaaa
number of curlsaaaaaaaaaa
Login to View More

Abstract

The invention aims at providing a polyester fiber for air-laid nonwoven fabrics which is extremely excellent in air-laid web formability, particularly in the ejection of fibers from a screen and which enables the production of bulky air-laid nonwoven fabrics having excellent texture. The aim is attained by a process for the production of a polyester fiber for air-laid nonwoven fabrics which has either a fineness of 10dtex or below or a fiber length of 8mm or above and exhibits a number of crimp of 8.5 waves per 25mm or above, a ratio of percentage of crimp to number of crimp of 0.65 or below,a crimp modulus of elasticity of 70% or above and which contains as the fiber-forming resin component a polyester wherein alkylene terephthalate repeating units account for at least 80 mole% of all the repeating units, which process comprises subjecting unstretched polyester filaments taken off at a spinning speed of 1500m / min or below to both stretching at a low stretch ratio of 0.60 to 1.2 and at a temperature higher than the glass transition temperature of the polyester by 10 DEG C or above and fixed-length heat treatment simultaneously.

Description

technical field [0001] The present invention relates to fibers for air-laid nonwoven fabrics, and more specifically, to polyester-based fibers for air-laid nonwoven fabrics excellent in the spinning yield of the screen. Background technique [0002] Compared with the nonwoven fabric produced by the widely used carding method in the past, the airlaid nonwoven fabric has no difference in the fiber orientation in the forward direction of the nonwoven fabric during production, and the fiber orientation in the width direction in the direction perpendicular to it is uniform and uniform. In addition, compared with non-woven fabrics produced by the pulping method, it is easier to express the bulkiness of non-woven fabrics, and it is the area where the production volume of non-woven fabrics has increased the most in recent years. In general, as shown in Patent Document 1, fibers for an airlaid nonwoven fabric are provided with planar zigzag or helical latent curls in order to impart ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): D04H1/54D01F8/06D04H1/42D01F8/14D01F8/04D04H1/541D04H1/544D04H1/55
Inventor 合田裕宪
Owner TEJIN FIBERS LTD