JPH0589460U - Melt spinning equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a melt spinning apparatus capable of easily and easily changing brands without changing the structure of a spinneret. [Structure] When changing brands, the spinneret 3 is replaced with a long spinning pack 2'shown by a two-dot chain line without changing the heating cylinder 8.
The lower surface of the spin block 1 is projected from the lower surface of the spin block 1. Although the temperature of the spinning pack or the spinneret corresponding to the protruding portion is lowered, the heating device 9 has a three-stage heater block 9
The heater blocks 9a to 9b, which are divided into a, 9b, and 9c and correspond to the pack protrusion length, are set to the same temperature as the pack 2 ', and the third heater block 9c is set to the same temperature or a different temperature. The above-mentioned temperature drop is prevented from occurring and the temperature is maintained at an appropriate temperature that meets the conditions.

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 a heating atmosphere below a spinneret can be easily and easily adjusted according to a 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 (Japanese Patent Laid-Open Nos. 54-55618, 60-59119, and 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, the length of the heating zone from below the spinneret to the cooling device also needs to be changed depending on the brand. Especially for a brand with a 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, the die surface is also close to the cooling zone, and the die temperature decreases, so it is usual to use a 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 above 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, the present invention is a melt spinning apparatus having a cooling device below a spinning pack, and a heating zone having a heater surrounding a spun yarn is formed between the spinning pack and the cooling device. Is divided into a plurality of stages at least in the yarn flow-down direction, and the melt-spinning apparatus is characterized in that.

[0011]

[Action]

 According to the present invention, the brand can be easily changed without changing the configuration of the heating device disposed under the spinneret by a simple operation such as exchanging the spinning packs having different lengths.

[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, a spinneret 3 is attached to the lowermost part of the spin pack 3, and molten polymer is discharged from a discharge hole 4 of the spinneret 3. The spun yarn y is formed. A cooling device 5 for cooling the spun yarn y is arranged below the spinning pack 2, and cooling air is blown 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 insulating plate 7. The heating cylinder 8 has a temperature of the discharged polymer, a space temperature below the spinneret, a temperature of a spun yarn, and the like. The heating device 9 for controlling the heating device 9 and the heat insulator 10 for holding the heating device 9 are provided, and the heating zone 11 is formed in the space surrounded by the heat insulator 10.

The heating device 9 is provided so as to surround the spinneret 3, and independent heating elements in the yarn flow-down direction are incorporated over a plurality of stages (for example, three stages of heater blocks 9a, 9b, 9c), The heating is controllable. The heating device 9 may be provided in one body, or may be divided and arranged in a plurality of stages, and these are divided and arranged with a heat insulating material (plate) interposed so that each can be easily controlled. You may do so.

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 11 (from the lower surface of the spinneret 3 to the heat insulating plate 7). The distance to the bottom surface) is formed. The length L of the heating zone 11 is about 50 to 150 mm in the standard polyester brand, and the heating device is appropriately controlled to operate at a predetermined temperature.

However, in the case of special brands, particularly those with extremely small single fiber denier, good physical properties can be obtained even if the temperature of the heating device 9 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 thus sensitive to temperature, and the denier variation becomes large unless the spun yarn is cooled rapidly.

When changing to such a fine denier brand, the spinning packs are of course replaced, but at this time, a pack having a large pack length corresponding to the fine denier whose brand is changed may be attached. ..

That is, as shown by the two-dot chain line, the lower surface of the spinneret 3 is spun by forming a 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 project from the lower surface of the block 1.

By causing the spinning pack 2'to project from the spin block 1 in this manner, the temperature of the spinning pack or the spinneret at a portion corresponding to this decreases, but in this case, for example, the heating device 9 has a three-stage heater block. When the lower surface of the spinning pack 2'is divided into 9a, 9b and 9c so as to project to the position of the second heater block 9b, the second heater block 9b has the same temperature as the pack 2 '. The heater block 9c in the third stage is set to the same temperature or a different temperature to prevent the above-mentioned temperature drop from occurring and to maintain the temperature at an appropriate level.

More specifically, a polyester device having a relative viscosity of 0.64 and a titanium oxide content of 0.3% by weight is prepared by using the spinning apparatus having the three-stage heater block as described above. Changed from 75 denier / 36 filaments, which is a normal brand in production at a spinning speed of 3500 m / min and a drawing speed of 5200 m / min, to 32 denier / 72 filaments, which is a fine denier brand, under almost the same conditions except that the spinning pack was replaced. did.

At this time, a spinning pack having a heating zone length L = 90 mm, which is almost the same as the ordinary brand, was used, and spinning was carried out at a set temperature of 350 ° C. with a heater block of three stages, and U% which is an index of denier uniformity was obtained. Was 1.2% or more, far exceeding the target of 0.7%. However, as shown by the chain double-dashed line in FIG. 1, the lower surface of the spinning pack is a spinning pack projecting to the position of the second-stage heater block (L = 40 mm), and the three-stage heater block has the same temperature as the spinning temperature 295. At the set temperature of ° C, U% fell to 0.7%, and when spinning was performed with the heater block in the third stage turned off, the result was 0.6% or less, which was a great improvement.

The above is the case of a single spinneret, but it goes without saying that the same applies to the case of having a plurality of spinnerets. Also, although an example of changing to a fine denier has been explained, 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.

[0024]

[Effect of the 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 reference numerals] 1 spin block 2 spinning pack 3 spinneret 5 cooling device 7 heat retaining plate 8 heating cylinder 9 heating device 10 heat insulator 11 heating zone

Claims (1)

[Scope of utility model registration request] 1. A melt spinning apparatus having a cooling device below the spin pack, wherein a heating zone having a heater surrounding a spun yarn is formed between the spin pack and the cooling device,
A melt spinning apparatus, wherein a heater in the heating zone is divided so as to be adjustable at least in a yarn flow-down direction in a plurality of stages.