KR101186006B1 - Melt spinning pack - Google Patents

Abstract

PURPOSE: A pack for gel spinning is provided to enhance stirring efficiency and to improve tensile strength and elasticity. CONSTITUTION: A pack for gel spinning applied to a gel spinning device comprises first to third punching plates(131-133) which are separately placed; and first to third mesh screens(141-143) which are crossed to the first to third punching plate. The hold sizes of the first to third punching plates are 6-10mm, 4-6mm, and 3-4mm, respectively.

Description

Gel spinning pack {MELT SPINNING PACK}

The present invention relates to a gel-spinning pack, and more particularly, even if the molecular weight is at least irrelevant, for example, PE gel spinning having a molecular weight of 1 million or more, the efficiency of stirring is improved to increase the draw ratio and tensile strength and The present invention relates to a gel-spinning pack that can improve the numerical value of the elastic strength and expect an overall quality improvement.

Gel spinning is a spinning method that realizes high strength and high modulus in flexible polymers such as polyethylene.

This gel spinning is to close the ideal structure by reducing the defects in the microstructure of the polymer, the basic concept is to minimize the defects inside the polymer.

The reasons for the first success of the gel spinning method in polyethylene are as follows.

1. Polyethylene is a simple chemical structure with a flat zigzag structure that does not have a bulky side chain.

2. Good crystallinity.

3. There are no strong defects between the molecular chains.

4. Ultra high molecular weight is easily obtained.

Here, 1 and 4 are important in reducing defects, and 3 is important in that the stretching is smooth.

In the manufacture of ultra high strength polyethylene fibers, the molecular weight of the raw polymer is very important. The polymer extruded in solution has a large number of entanglements, making it difficult to stretch. That is, the stretching process has a lot of entanglement in the fiber, which is a defect. Ultra-high molecular weight increases the entanglement per molecule, it is also difficult to loosen between molecular chains, showing a high melting point and practically impossible to stretch.

Therefore, the gel spinning method uses a lean solution by a solvent. Examples of the solvent include tetralin, dicarin, naphtharene and the like. In order to stretch all the molecules in a fiber, theoretically, one entanglement per molecule is most ideal. Because the entanglement in the stretching process exists as a place where the tension is broken. Therefore, the concentration of the gel spinning solution is very important in the sense that the concentration control the concentration, which determines the strength and elastic modulus of the fiber.

On the other hand, the known gel spinning device is provided with a gel spinning pack for providing a gel spinning solution with a spinning nozzle. Gel spinning pack is composed of a plurality of perforated plates, the size of the through-holes formed in the perforated plates at this time are all provided the same.

By the way, in the prior art having such a structure, it may be irrelevant when the molecular weight is small, for example, in the case of PE gel spinning having a molecular weight of 1 million or more, the agitation is not well progressed, the draw ratio is reduced and the tensile strength and elastic strength Since the overall quality improvement cannot be expected such that the figure is lower than the regulation, an alternative is required.

Korean Patent Office Application No. 20-1995-0045012 Korean Patent Office Application No. 20-2004-0014430 Korean Patent Office Application No. 10-2009-7022684 Korea Patent Office Application No. 10-2009-0136263

The object of the present invention is not only at least irrelevant of molecular weight, for example, even in the case of PE gel spinning having a molecular weight of 1 million or more, the agitation efficiency is improved, and the tensile strength and elastic strength can be improved along with the increase of the draw ratio. It is to provide a gel spray pack that can be expected to improve the quality.

On the other hand, the above object is a gel spinning pack applied to the gel spinning device,
First to third perforated plates spaced apart from each other; And
A first to third mesh screen disposed to intersect with respect to the first to third perforated plates,
The size of the through hole formed in the first to third perforated plate is gradually reduced to the perforated plate toward the spinning nozzle side of the gel spinning device, the size of the mesh formed on the first to third mesh screen is the spinning Gradually get smaller towards the mesh screen on the nozzle side,
The through hole size of the first perforated plate is 6 to 10 mm, the through hole size of the second perforated plate is 4 to 6 mm, and the through hole size of the third perforated plate is 3 to 4 mm,
The first mesh screen is 100 mesh, the second mesh screen is 200 mesh, and the third mesh screen is achieved by a gel spinning pack, characterized in that the size of 400 mesh (mesh) do.

According to the present invention, not only the molecular weight is at least irrelevant, for example, even in the case of PE gel spinning having a molecular weight of 1 million or more, the stirring efficiency is improved, and the tensile strength and the elastic strength can be improved along with the increase in the draw ratio. There is an effect that can be expected to improve.

1 is a schematic structural diagram of a gel spinning device according to an embodiment of the present invention.
Figure 2 is a side cross-sectional structural view of the gel-spinning pack applied to Figure 1;
3 is a plan view of the perforated plate shown in FIG.
4 is a graph of correlation between draw ratio, tensile strength and elastic strength.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

1 is a schematic structural diagram of a gel spinning device according to an embodiment of the present invention, Figure 2 is a side cross-sectional structural view of the gel spinning pack applied to Figure 1, Figure 3 is a plan view of the perforated plate shown in Figure 2, and 4 is a correlation graph between draw ratio, tensile strength and elastic strength.

As shown in these figures, the gel spinning device of this embodiment may include a raw material feeder 110, a gel spinning pack 120, and a spinning nozzle 150.

Raw material feeder 110 is a part for supplying the raw material of the fiber. In the case of the present invention, since the molecular weight is small, for example, PE gel spinning of 1 million or more is possible. In particular, UHMWPE (Ultra High Molecular Weight Polyethylene) gel spinning is also possible.

The lower part of the raw material feeder 110 is provided with an extruder 115 for metering, extruding and conveying a predetermined amount of the raw material supplied.

Spinning nozzle 150 serves to substantially form the fiber through a plurality of nozzle holes (not shown).

The spinning nozzle 150 may be disposed in the cooling duct 160 because the raw material needs to be cooled in the process of changing the fiber through the spinning nozzle 150.

An air inlet 161 is formed at one side of the cooling duct 160 and an air outlet 162 is formed at the other side, and the fiber is circulated to the air outlet 162 through the air inlet 161. Can be cooled.

The lower part of the spinning nozzle 150 is provided with a post-treatment device 170 for winding, stretching, heat setting and post-processing the fiber to be cooled.

On the other hand, the gel spinning pack 120 is disposed between the raw material feeder 110 and the spinning nozzle 150.

As shown in FIG. 2, the gel spinning pack 120 has a structure in which a plurality of perforated plates 131 to 133 and a plurality of mesh screens 141 to 143 are arranged to cross each other.

In the present embodiment, three perforated plates 131 to 133 and three mesh screens 141 to 143 are used, and for convenience, the first to third perforated plates 131 to 133 and the first to third meshes are used. It is referred to as the screen (141 ~ 143).

A plurality of through holes 131a to 133a are formed in the first to third perforated plates 131 to 133 as shown in FIG. 3. In this case, the size of the through holes 131a to 133a formed in the first to third punching plates 131 to 133 may be gradually reduced from the first punching plate 131 to the third punching plate 133. do.

In the present embodiment, the size of the through hole 131a of the first perforated plate 131 is 6 to 10 mm, the size of the through hole 132a of the second perforated plate 132 is 4 to 6 mm, and the through hole 133 of the third perforated plate 133a. The size may be 3-4 mm.

As such, when the sizes D1 to D3 of the through holes 131a to 133a formed in the first to third perforated plates 131 to 133 gradually decrease from the first perforated plate 131 to the third perforated plate 133, As the raw material melted can be spread and spread evenly while going to the first perforated plate 131, the second perforated plate 132, and the third perforated plate 133, the yield of the process can be expected to be improved, as in the prior art. Concentration in the central area can overcome the blockages, such as clogging of pores or poor yields.

The first to third mesh screens 141 to 143 are porous meshes, and lattice holes (not shown) may also be formed in the first to third mesh screens 141 to 143. One mesh screen 141 is manufactured to have a size of 100 mesh, a second mesh screen 152 is 200 mesh, and a third mesh screen 143 has a size of 400 mesh.

As such, when the first to third mesh screens 141 to 143 are manufactured, the raw materials melted together with the first to third perforated plates 131 to 133 can be widely and evenly dispersed and diffused, thereby improving the yield of the process. Also, excellent quality improvement of the fiber can be expected.

As described above, according to the present invention, not only the molecular weight is at least irrelevant, for example, even in the case of PE gel spinning having a molecular weight of 1 million or more, the stirring efficiency is improved, and the tensile strength and the elastic strength can be improved while the draw ratio is increased. Therefore, overall quality improvement can be expected. This can be confirmed through the graph of FIG. 4.

As shown in the graph of FIG. 4 and Equation 1 below, the stirring function is proportional to X, T, and M.

[Equation 1]

In addition, the stirring function K may be represented by Equation 2 below.

&Quot; (2) "

Meanwhile, in the conventional PE gel spinning, the temperature of the all-line spinning process is performed within the range of 190 to 250 ° C., but in the present invention, the temperature of the gel spinning pack 120 and the spinning nozzle 150 is higher than that of the conventional process. It can be made 5-10 degreeC high (range 200-260 degreeC).

As described above, the sizes D1 to D3 of the through holes 131a to 133a formed in the first to third perforated plates 131 to 133 in the gel spinning pack 120 may be the third perforated plates in the first perforated plate 131. As it gradually proceeds to (133) to obtain a dispersed effect (dispersed effect and distribution effect) of the stirring as shown in Table 1 below it can be expected to improve the quality due to the increase in the draw ratio.

[Table 1]

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, such modifications or variations will have to be belong to the claims of the present invention.

110: raw material feeder
115: extruder
120: gel room pack
131 to 133: first to third punched plates
141 to 143: first to third mesh screens
150: spinning nozzle
160: cooling duct
161: air inlet
162: air outlet
160: post-processing device

Claims (8)

delete delete delete delete As a gel spinning pack applied to a gel spinning device,
First to third perforated plates spaced apart from each other; And
A first to third mesh screen disposed to intersect with respect to the first to third perforated plates,
The size of the through hole formed in the first to third perforated plate is gradually reduced to the perforated plate toward the spinning nozzle side of the gel spinning device, the size of the mesh formed on the first to third mesh screen is the spinning Gradually get smaller towards the mesh screen on the nozzle side,
The through hole size of the first perforated plate is 6 to 10 mm, the through hole size of the second perforated plate is 4 to 6 mm, and the through hole size of the third perforated plate is 3 to 4 mm,
Wherein the first mesh screen is 100 mesh, the second mesh screen is 200 mesh, and the third mesh screen has a size of 400 mesh. delete delete delete

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