KR960011586B1 - A godet roll for spinning synthetic fiber - Google Patents

Abstract

The godet roll includes grooves(1) satisfying the following equation(I) and (II) in a direction of length on the surface of the roll ý=( ý11/ D)=G100(%)=30-70(%)(I) 11/12=0.5-2(II) wherein, D : an outside diameter(cm) of the godet roll, ý : the number of grooves(8-32), 11 : the contact length(cm) of section(2) with which trough, 12 : the width(cm) of groove. The grooves play an important role in preventing the bent of yarn trace or the turbulence of yarn by reducing the contact area with yarn.

Description

Gotht Roll for Synthetic Fiber Spinning

Figure 1a is a longitudinal cross-sectional view of the high roll roll of the present invention.

b is a plan view of the roll roll of the present invention.

2 is an explanatory diagram showing a change in the apostle when using the present invention and a conventional gourd roller,

a is when using a conventional roll roll,

b shows the use of a high roll of the present invention.

* Explanation of symbols for main parts of the drawings

1: groove 2: contact surface with sour

a: entrance point b: exit point

D: Diameter of high roll roll 1 ₁ : Length of part contacted by yarn

1 ₂ : width of groove

The present invention relates to a high roll used for spinning and winding thermoplastic synthetic fibers at a high speed of 5,000 m / min (MPM) or higher.

Conventional goblet rolls have a circular shape, so when spinning and winding thermoplastic synthetic fibers at 5,000 MPM or more, they come into contact with the entire surface of the goblet rolls from the point of entry of the sago goll roll to the exit point. The friction area with the roll roll surface increased, which caused the slope to bend inward at the exit point of the yarn.In addition to the large friction area, the effect of vibration generated when the roll roll rotates at high speed Receiving the wound around the rolls of gooseul (사) will cause.

Therefore, due to such a phenomenon, a lot of cutting occurs, and this is wound on a roll of roll, which causes poor operation and deteriorates the quality of the yarn.

The present invention is to solve the above problems, it characterized in that a groove (Groove) that satisfies a predetermined condition on the surface of the high roll roll to reduce the contact area between the yarn and the high roll roll.

Hereinafter, the present invention will be described in detail by way of example.

In the present invention, grooves 1 satisfying the following formulas (I) and (II) are formed on the surface in the longitudinal direction of the gouge roll with the contact surfaces 2 at regular intervals therebetween.

next

Where η is the ratio (%) of the total length of the surface (2) where

D: Outer diameter of centrifugal roll (cm)

n: number of grooves (8-32)

1 ₁ : Length (cm) of the part (2) where thread thread contacts

1 ₂ : width of groove (cm)

According to the present invention, the contact area with the yarns is reduced due to the plurality of grooves 1 formed on the surface thereof, thereby preventing the bends and the scattering of the yarns, and as a result, the trimmings can be reduced.

However, if the groove (1) is made too much, the friction area is reduced too much, which makes it impossible to sufficiently absorb the high tension generated during high-speed spinning on the high roll, thereby increasing the winding tension of the thread wound on the winder. As a result, it is difficult to control the physical properties of yarns and lower the operability.

Therefore, the present invention is to be 30-70% the value of η in formula (I), ₁ 1/1 ₂ of Sado while maintaining appropriately the winding tension of the yarn a value of 0.2-2 hameuroseo be a bending phenomenon or Saran It was possible to prevent the phenomenon, and it was possible to produce thermoplastic synthetic fiber yarn having no trimming and good physical properties even at high spinning speed with high operability.

Example 1

Polyethylene terephthalate having an intrinsic viscosity of 0.64 was spun at a temperature of 290 ° C. through captivity of capillary diameter of 0.025 cm and number of 36 holes.

The discharge rate was also changed in order to set the winding denier at 75 while adjusting the winding speed to 5,000-6,500 MPM.

At this time, a high roll was used as the outer diameter of ψ22㎝ and the number of grooves 12. The results are shown in Table 1.

At this _{time, η = 50%, 1 1} /1 was a ₂ = 1.

Comparative Example 1

Spinning conditions were the same as in Example 1, and a circular, conventional gourd roll was used. The results are shown in Table 2.

[Example 2-4, Comparative Example 2-3]

The spinning conditions of Example 1 were the same and the winding speed was fixed at 5,000 MPM, and the tension change of the yarn was observed while changing the η and 1/1 of the high roll.

The results are shown in Table 3.

As can be seen from Table 3, it can be seen that when the winding speed is constant, the tension increases as η and 1/1 increase. In general, the most suitable yarn tension for high-speed winding of thermoplastic synthetic fiber is 0.1-0.25g / De, because of the superiority of the ease of property control and the operability of the yarn.

In more detail, Table 3 is considered to be advantageous in terms of operability due to low tension at η = 30%, but is outside the range of 1/1 = 0.5-2.

Therefore, in this condition, the frictional tension between the thread and the high roll is so low that the thread is slipped on the high roll so that there is a lot of room for irregular variation in physical properties.

On the contrary, when η = 70% and 1/1 = 2.3 or more, the frictional tension between the thread and the high roll increases and the winding tension increases, which is relatively disadvantageous in terms of operation.

Claims (1)

Synthetic Fiber Spinning Roll (Gedet Roll) formed by forming grooves (1) satisfying the following formulas (I) and (II) in the longitudinal direction thereof next

In the above formula, D: outer diameter of roll roll (cm) η: Number of grooves (8-32) 1 ₁ : Length (cm) of the part (2) where thread thread contacts 1 ₂ : width of groove (cm)

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