Method for manufacturing poly(ethyleneterephthalate) drawn fiber, poly(ethyleneterephthalate) drawn fiber and tire-cord
a manufacturing method and tire technology, applied in the direction of yarn, melting spinning method, transportation and packaging, etc., can solve the problems of high heat shrinkage ratio and low elasticity, reduce the elasticity and dimensional stability of tires, and process is required, and achieves superior dimensional stability and tensile strength, uniform physical properties, and high fineness.
Active Publication Date: 2016-05-03
KOLON IND INC
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AI Technical Summary
Benefits of technology
[0020]According to the present invention, a tire-cord showing superior dimensional stability and tenacity and uniform physical properties while having high fineness, and a manufacturing method thereof can be provided. The tire-cord can be preferably used as a body ply cord for a pneumatic tire, thereby improving steerability and riding comfort of the vehicle.
Problems solved by technology
However, it has a disadvantage of reducing elasticity and dimensional stability of the tire after curing process due to its high heat shrinkage ratio.
However, they still have high heat shrinkage ratio and low elasticity, and thus the PCI process is required.
Since the undrawn fiber having high crystallinity has a relatively narrow region to be drawn, non-uniform drawing or breakage due to friction easily occurs when the undrawn fiber is drawn at a ultra-high speed and a high drawing ratio using a ultra high-speed spinning equipment.
For this reason, there is a limitation in the drawing ratio of the undrawn fiber having high crystallinity when applied to the ultra high-speed spinning equipment, and sufficient drawing cannot be given to the fiber, resulting in a great reduction in tensile strength of the drawn fiber.
In particular, it is more difficult to secure a sufficient distance between holes in the spinneret and uniform cooling during the manufacturing process of the drawn fiber having a high fineness of 2000 denier or more and the tire-cord, and thus a great reduction in physical properties such as tenacity occurs, and a tire-cord having uniform physical properties cannot be obtained.
In more detail, when the drawn fiber having a high fineness and the tire-cord are manufactured using the known spinning equipment, the amount of polymers staying in a spinning chimney is increased to generate non-uniform cooling between inner and outer layers, and thus it is difficult to produce a drawn fiber having uniform physical properties and monofilaments with an uniform cross-sectional area and a tire-cord, and the fineness of monofilaments is increased to increase a discharge speed of the melt in the spinneret, and thus it is difficult to provide sufficient spinning draft.
Thus, an orientation difference occurs due to the larger cooling difference between inner and outer layers of monofilaments so as to reduce tenacity, and dimensional stability is also reduced due to the low spinning draft, resulting in unsatisfactory characteristics of tire-cord.
However, this twisting method requires high production costs, and tenacity is damaged by friction due to twisting, and thus there are many difficulties in productivity improvement in manufacturing of a fiber with a thick fineness and sufficient tenacity.
Recently, as the use of RADIAL tire is increased because of the above problems, it is required to provide a tire-cord having a large fineness and excellent and uniform physical properties, but satisfactory progress has not been achieved yet.
However, as the intrinsic viscosity of the polymer is increased, a large difference in intrinsic viscosities between the inner and outer layers of the polymer chip is generated.
Therefore, the spinnability deteriorates due to the heterogeneity of the viscosity, and the increased intrinsic viscosity of the polymer increases the melt viscosity of the polymer, which increases discharge pressure in the spinneret during spinning, leading to deterioration in spinnability and productivity.
In order to solve these problems, a method of reducing the melt viscosity by increasing spinning temperature has been used, but reduction of polymerization degree is generated due to thermal degradation and hydrolysis of the polymer, and thus it is difficult to achieve high tenacity.
An example of the former is stearic acid, but its addition to a resin has a disadvantage of reducing the melt viscosity and molecular weight at the same time.
Thus, it is economically unfavorable, and the presence of residues is increased by partial agglomeration and poor dispersion of the viscosity-reducing agent, resulting in deterioration of tensile property and processability.
Method used
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Experimental program
Comparison scheme
Effect test
examples [UNK]
Examples 6˜10
[0064]A PET tire-cord was manufactured by ‘Z-twisting’ the drawn fibers of any one of Examples 1 to 5 to have a predetermined total fineness and twist per meter (TPM), ‘S-twisting’ 2 plies of the Z twisted fibers with the same twisting level, dipping in an RFL adhesive solution, and drying and heat-treating the same. In this regard, the used drawn fiber, drawn fiber fineness, Twist Multiplier (TM) and heat treatment conditions for the cord are the same as in the following Table 3, and the composition of the RFL adhesive solution and drying conditions were in accordance with the typical conditions for the manufacture of PET tire-cord.
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Abstract
Disclosed are a method for manufacturing a drawn fiber, which is suitable for manufacturing a poly(ethylene terephthalate) drawn fiber showing superior strength and dimensional stability and having a high fineness of 2000 denier or more without breakage or reduction in physical properties during the manufacturing process, and a poly(ethylene terephthalate) drawn fiber and a tire-cord obtained therefrom.
Description
CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a National Stage of International Application No. PCT / KR2012 / 007709 filed Sep. 25, 2012, claiming priority based on Korean Patent Application No. 10-2011-0097692, filed Sep. 27, 2011, the contents of all of which are incorporated herein by reference in their entirety.TECHNICAL FIELD[0002]The present invention relates to a method for manufacturing a drawn fiber, which is able to manufacture a high strength poly(ethylene terephthalate) drawn fiber showing superior strength and dimensional stability and having a high fineness of 2000 denier or more without breakage or deterioration in physical properties during the manufacturing process, and a poly(ethylene terephthalate) drawn fiber and a tire-cord obtained therefrom.BACKGROUND ART[0003]A tire is a complex body of fiber / steel / rubber, and generally has a structure as illustrated in FIG. 1. Herein, body ply is, also called carcass, a reinforcing cord layer inside the tire,...
Claims
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IPC IPC(8): D01D5/08D02G3/48D02J1/22D01F6/60D01D5/12D01F6/62B60C9/00D01D5/098D01D10/02
CPCD01F6/60B60C9/0042D01D5/08D01D5/098D01D5/12D01D10/02D01F6/62D02G3/48D02J1/22D10B2331/04
InventorPARK, SUNG-HOCHUNG, ILKIM, GI-WOONG
OwnerKOLON IND INC