JPH0625364U - Melt spinning equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a melt spinning device capable of easily and easily changing brands without changing the structure of a spinneret. [Structure] The heating device 7 is provided with a plurality of heaters 7-1 to 3-3 capable of independently controlling heating in the yarn flow-down direction, and a shutter 8 which can be opened and closed is provided under each heater 7-1 to 3. -1 ~
3 is provided, and the slide plate 8b is moved in and out to regulate the length L of the heating zone 9. When changing to another brand, corresponding to this brand, it is possible to change the spinning pack and to change the condition such that the slide plate 8b at a predetermined position is projected to change various conditions such as the length of the heating zone.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 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 the heating atmosphere below the spinneret can be easily and easily adjusted according to the brand.

[0002]

[Prior art]

 Conventionally, melt-spinning of a thermoplastic polymer such as polyamide or polyester has been performed by blowing cooling air onto a yarn spun by a spinneret and then winding it.

On the other hand, in recent years, during spinning at high speed and spinning of polymers having different melt viscosities, the temperature of the spinneret and the high temperature of the yarn forming region under the spinneret have been controlled.

The spin winding device of such a system adopts a method of attaching various heaters under the spinneret (JP-A-54-55618, JP-A-60-59119, and JP-A-63-99312). (See the official gazette).

These heaters have different temperature settings depending on the viscosity of the spun polymer, the composition, the number of spun filaments, single yarn (single fiber) denier, etc., and these conditions are set to appropriate values depending on the physical properties of the yarn and the process condition. It has established.

Further, it is necessary to change the heating zone length from under the spinneret to the cooling device depending on the brand. Especially for brands with small single fiber denier, if this heating zone is long, variations in cooling between yarns are likely to occur. As a result, the dispersion of single fiber denier, that is, the dispersion of U% becomes a problem.

Therefore, for brands with small single fiber denier, the length of the heating zone is shortened and the yarn spun from the spinneret is rapidly cooled. In this case, since the die surface is close to the cooling zone and the die temperature is lowered, it is usual to use the heating plate on the lower surface of the pack as well (see JP-A-63-99312).

[0008] In this way, when changing the brand, it is necessary to change the structure under the mouthpiece, and there are problems that the number of workers increases and much loss time is required.

[0009]

[Problems to be solved by the device]

 The present invention has been made for the purpose of solving the problems in the prior art, and provides a melt spinning apparatus capable of easily and easily changing brands without changing the structure of the lower die.

[0010]

[Means for Solving the Problems]

 That is, in the present invention, in a melt spinning apparatus having a cooling device below a spinning pack, a heating zone having a heating device surrounding a spun yarn is formed between the spinning pack and the cooling device, and the heating zone is heated. Melt spinning, characterized in that the device is composed of heaters that are divided in a plurality of stages at least in the yarn down-flow direction, and that a shutter for controlling a heating zone is provided between the heaters. It is a device.

[0011]

[Action]

 According to the present invention, the length of the heating zone can be easily adjusted or changed without changing the configuration of the heating device arranged under the spinneret by a simple operation such as exchanging the spinning packs with different lengths. It is possible to easily and quickly deal with brand changes and work therefor.

[0012]

【Example】

 Hereinafter, the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the present invention.

In the figure, 1 is a spin block, a spin pack 2 is inserted in the spin block 1, a spinneret 3 is attached to the bottom of the spin block 1, and a spinneret 3 is melted from an ejection hole 4 of the spinneret 3. The polymer is spun into yarn y. A cooling device 5 for cooling the spun yarn y is disposed below the spinning pack 2, and cooling air is blown from the air outlet 6 in a direction traversing the yarn y to cool the yarn. ing.

A heating device 7 is mounted between the spinning pack 2 and the cooling device 5 so as to surround the spun yarn, and a heating zone 9 is formed between the heating device 7 and the temperature of the discharged polymer and the space temperature below the spinneret. Alternatively, the temperature of the spun yarn can be controlled.

In the heating device 7, independent heaters are incorporated in the yarn flow-down direction over a plurality of stages (three stages of heaters or heater blocks 7-1, 7-2, 7-3 in this example). Is heating controllable. Under these heaters 7-1 to 3-3, there are provided shutters 8-1, 8-2 and 8-3 made of metal or heat insulating material which can be opened and closed. The shutter 8 is configured to include a frame plate 8a and a slide plate 8b housed in the frame plate 8a. As shown in the figure, the slide plate 8b is moved in and out (opened / closed) as necessary to regulate the length of the heating zone 9. I am doing it as I do.

Here, in 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 9 (from the lower surface of the spinneret 3 to the protective shutter 8b). The distance to the bottom surface) is formed. The length L of the heating zone 9 is about 50 to 150 mm in the standard brand of polyester, and the heating device is operated by appropriately controlling the heating device to a predetermined temperature.

However, in the case of special brands, especially those with extremely small single fiber denier, good physical properties can be obtained even if the temperature of the heating device 7 is changed within the range of the heating zone length L of 50 to 150 mm. I can't. This is because the single-fiber denier is small and therefore sensitive to temperature, and the denier variation becomes large unless the spun yarn is cooled rapidly.

When changing to such a fine denier brand, of course, the spinning pack is replaced, but at this time, a pack corresponding to the fine denier for which the brand is changed is attached.

In this case, when the brand in use with the slide plate 8b of the lowest shutter protruding is changed to another brand, corresponding to this brand, for example, as shown in the figure at the same time when the spinning pack is replaced, Then, the slide plate 8b of the shutter at the intermediate position may be changed to a protruding state and various conditions such as the length of the heating zone may be changed, and the structure under the cap is not changed at all.

By changing the spinning pack 2 in this way, the temperature of the spinning pack or the spinneret or the temperature below the spinneret corresponding to the spinning pack 2 also changes, but at this time, the heaters 7-1, 7- 2, 7-3 is the temperature corresponding to the brand, for example, the heaters 7-1 and 7-2 are adjusted to the same temperature, and the heater 7-3 is a lower temperature or an appropriate temperature according to the conditions as off. To be held.

More specifically, using a spinning apparatus equipped with a three-stage heater (heater block) as described above, a relative viscosity of 0.64 and a titanium oxide content of 0.3% by weight are used. Polyester chips were spun at a spinning speed of 3500 m / min and a drawing speed of 5200 m / min. The normal denomination of 75 denier / 36 filaments, which was in production, was replaced with the spinning pack, but the denier was 32 denier under the same conditions. Change to / 72 filament.

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 used, and spinning was performed at a set temperature of 350 ° C. with a three-stage heater block. U% which is an index of denier uniformity Was 1.2% or more, far exceeding the target of 0.7%. However, as shown in the figure, the slide plate 8a of the shutter at the intermediate position is changed to the protruding state, and the other slide plates are stored so that L = 40 mm, and the heater block at the bottom is turned off. In the case of spinning as above, the result was greatly improved to less than 0.6%.

Although an example in which shutters are attached under each heater has been described, it is not always necessary to attach shutters under all heaters. Also, depending on the case, it is possible to use the shutter by changing it to a necessary place.

Although the above is the case of a single spinneret, it goes without saying that the same applies to the case of having a plurality of spinnerets. Furthermore, although an example of changing to fine denier has been described, the present invention is not limited to changing a brand, and can be similarly applied to the case of changing manufacturing conditions without distinction between general and special brands. In addition, although an example in which the packs have the same length has been described, the packs are not limited to this and different lengths can be used.

[0025]

[Effect of device]

 As described above, according to the present invention, it is possible to easily and easily respond to the required conditions without changing the structure of the base when changing the brand or manufacturing conditions, and flexible production is possible. It has a very remarkable effect.

[Brief description of drawings]

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

[Explanation of symbols]

 1 Spin block 2 Spin pack 3 Spinneret 5 Cooling device 7 Heating device 8 Shutter 9 Heating zone

Claims (1)

[Scope of utility model registration request] 1. A melt spinning apparatus having a cooling device below a spinning pack, wherein a heating zone having a heating device surrounding a spun yarn is formed between the spinning pack and the cooling device, and the heating device for the heating zone is A melt spinning apparatus comprising a heater divided into at least a plurality of stages in a yarn flow-down direction and provided with a shutter for regulating a heating zone between the heaters.