JP2579764Y2 - Melt spinning equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a melt spinning apparatus for thermoplastic synthetic fibers such as polyamide and polyester, and more particularly to a melt spinning apparatus in which a heating atmosphere below a spinneret can be adjusted simply and easily according to a brand. Things.

[0002]

2. Description of the Related Art Conventionally, melt spinning of a thermoplastic polymer such as polyamide or polyester is performed by blowing cooling air onto a yarn spun from a spinneret and then winding it.

On the other hand, in recent years, when spinning at a high speed or spinning polymers having different melt viscosities, the temperature of the die and the high temperature of the yarn forming region below the die have been controlled.

[0004] The spinning take-up device of such a system employs a method in which various heaters are attached under a base (Japanese Patent Application Laid-Open No. 54-1979).
-55618, JP-A-60-59119,
JP-A-63-99312).

These heaters have different temperature settings depending on the viscosity and composition of the spun polymer, the number of spun filaments, the denier of a single yarn (single fiber), and the like. These conditions are determined by appropriate values based on yarn physical properties and process conditions. ing.

[0006] The length of the heating zone from the base to the cooling device also needs to be changed depending on the brand. Particularly, in the case of a brand with a small single fiber denier, if the heating zone is long, the cooling between the yarns tends to be uneven. As a result, the dispersion of single fiber denier, that is, the dispersion of U% becomes a problem.

For this reason, for brands having a small single fiber denier, the method of shortening the length of the heating zone and rapidly cooling the yarn spun from the die is adopted. In this case, the surface of the base is also close to the cooling zone, and the temperature of the base decreases, so that a heating plate on the lower surface of the pack is usually used together (see Japanese Patent Application Laid-Open No. 63-99312).

[0008] In order to change the brand, it is necessary to change the structure under the base, and there is a problem that the number of workers is increased or a long time is required.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the prior art, and provides a melt-spinning apparatus which can easily and easily change a brand without changing a structure under a base. Is what you do.

[0010]

That is, the present invention provides a melt spinning apparatus having a cooling device below a spinning pack, in which spinning packs having different lengths in the yarn spinning direction can be mounted.
And divided in multiple directions in the yarn spinning direction.
The heating zone surrounding the spun yarn and the spinning pack
Yarns of the spin pack formed and mounted between the
The temperature of the heating zone corresponding to the change in the length in the spinning direction
Is adjustable .

[0011]

According to the present invention, it is possible to easily cope with a brand change by a simple operation such as replacing the spinning pack with a spinning pack having a different length without changing the configuration of the heating device disposed below the base.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG.
FIG. 2 is a sectional view showing an embodiment of the present invention.

In the figure, 1 is a spin block,
A spinning pack 2 is inserted into the spin block,
A spinneret 3 is attached to the lowermost portion, and a molten polymer is spun out from a discharge hole 4 of the spinneret 3 to form a yarn y.
A cooling device 5 for cooling the spun yarn y is provided below the spinning pack 2, and a cooling air is blown out from the outlet 6 in a direction crossing the yarn y to cool the yarn. .

A heating cylinder 8 is attached to the top of the cooling device 5 via a heat retaining plate 7. The heating cylinder 8 controls the temperature of the discharged polymer, the space temperature below the base, the temperature of the spun yarn, and the like. It has a heating device 9 to be controlled and a heat insulator 10 holding the heating device 9, and forms a heating zone 11 in a space surrounded by the heat insulator 10.

The heating device 9 is provided so as to surround the base 3, and has a plurality of independent heating elements (for example, three-stage heater blocks 9a, 9b, 9c) incorporated in the downstream direction of the yarn to enable heating control. Have been. The heating device 9 may be provided as a single unit or may be divided and arranged in a plurality of stages, and these are divided and arranged with a heat insulating material (plate) therebetween so that each can be easily controlled. May be performed.

Here, in a normal operation, for example, the lower surface of the spinneret 3 is located at substantially the same position as the lower surface of the spin block 1, and in this case, the length L of the heating zone 11 (from the lower surface of the nozzle 3 to the heat insulating plate 7). (Distance to the lower surface). The length L of the heating zone 11 is about 50 to 150 mm for a standard brand of polyester, and the heating device is operated by appropriately controlling the heating device to a predetermined temperature.

However, in special brands, especially brands having extremely small single fiber denier, the length L
When the temperature of the heating device 9 is changed in the range of 50 to 150 mm, good physical properties cannot be obtained. This is because the single fiber denier is small and therefore sensitive to temperature, and if the spun yarn is not rapidly cooled, the variation in denier becomes large.

When changing the brand to such a fine denier brand, the spinning pack is naturally replaced. At this time, a pack having a large pack length corresponding to the fine denier for which the brand is to be changed may be attached. .

That is, as shown by a two-dot chain line, the lower surface of the spinneret 3 is spun by forming the long spinning pack 2 'without changing the heat insulator 10 and the heating device 9 attached via the heat insulating plate 7. It is made to protrude from the lower surface of the block 1.

By causing the spin pack 2 'to protrude from the spin block 1 in this manner, the temperature of the spin pack or the die in the corresponding portion is reduced. In this case, for example, the heating device 9 is provided with a three-stage heater block. 9a,
9b and 9c, when the lower surface of the spinning pack 2 'is projected to the position of the second heater block 9b, the second heater block 9b is set to the same temperature as the pack 2'. The third-stage heater block 9c is set to the same temperature or a different temperature to prevent the above-described temperature drop and to maintain an appropriate temperature suitable for the conditions.

More specifically, as described above, 3
A polyester chip having a relative viscosity of 0.64 and a titanium oxide content of 0.3% by weight was spun at a spinning speed of 3500 m / min and a drawing speed of 5 using a spinning apparatus provided with a heater block of steps.
75 denier, which is a standard brand produced at 200 m / min.
Fine denier brand 32 denier / 7 under the same conditions except for changing the spinning pack from 36 filaments
Changed to 2 filaments.

At this time, a spinning pack having a heating zone length L = 90 mm, which is almost the same as that of a normal brand, was spun at a set temperature of 350 ° C. in all three heater blocks. It was 1.2% or more, far exceeding the target of 0.7%. However, as shown by a two-dot chain line in FIG. 1, a spinning pack in which the lower surface of the spinning pack projects to the position of the second heater block (L = 40)
mm) The U% drops to 0.7% at the set temperature of 295 ° C., which is the same temperature as the spinning temperature in both the third-stage heater blocks, and 0.6% when the third stage heater block is turned off. % Or less, resulting in a great improvement.

Although the above description is for a single spinneret, it goes without saying that the same can be applied to a case where a plurality of spinnerets are provided. In addition, although an example of the change to fine denier has been described, the present invention is not limited to the change of brand, and can be similarly applied to the case of changing the manufacturing conditions without distinguishing general or special brand.

[0024]

[Effects of the Invention] As described above, according to the present invention, it is possible to easily and easily respond to required conditions without changing the structure under the base when changing brands or manufacturing conditions.
This has an extremely remarkable effect that flexible production is possible.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spin block 2 Spin pack 3 Spinneret 5 Cooling device 7 Heating plate 8 Heating cylinder 9 Heating device 10 Heat insulator 11 Heating zone

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-269807 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) D01D 1/00-13/02

Claims (1)

(57) [Scope of request for utility model registration] In a melt spinning apparatus having a cooling device below a spinning pack, a spinning pack having a different length in a yarn spinning direction can be freely mounted.
And is divided in an adjustable manner in the yarn spinning direction in a plurality of stages,
In addition, the heating zone surrounding the spun yarn and the spinning pack and cooling
The length change in the yarn spinning direction of the installed spin pack formed between the
A melt spinning apparatus characterized in that the temperature of the heating zone can be adjusted accordingly .