JPH0610209A - Filament heat-treating unit for high speed spinning - Google Patents

Abstract

PURPOSE:To provide the subject heat-treating unit capable of freely shifting the heating zone in the vertical direction in a state where the heat-treating unit is fixed and of also freely selecting the heating zone length in producing fibers different, e.g. in the single yarn fineness, the kind of polymer and the take-off speed. CONSTITUTION:In a filament heat-treating unit comprising at least a heating cylinder and designed so as to heat the atmosphere of a high-speed span filament cooled and coagulated once, this heat-treating unit for high speed spinning is characterized by heat-insulating cylinders 3 and 4 detachably installed on one or both ends of the inner peripheral surface of the heating cylinder 1. According to the kind of fiber, the distance from the nozzle to the heating zone can be changed in a state where the heat-treating unit is fixed. Various kinds of fibers, therefore, can be produced by the same spinning machine in a state where the heat-treating unit is fixed. Consequently, the faults in the conventional technique, i.e., problems, e.g. about extension of a new device for shifting the heat-treating unit, control of the thread handling area and accuracy of setting of the heat-treating unit can be solved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a yarn heat treatment apparatus used for high speed spinning of synthetic fibers. More specifically, a yarn used for high-speed spinning in which a thermoplastic polymer is melt-spun, the spun yarn is once cooled and solidified below the glass transition temperature, and then passed through a heating zone for heat drawing and heat treatment, and then taken at a high speed. The present invention relates to a strip heat treatment device.

[0002]

2. Description of the Related Art In recent years, for the purpose of cost reduction, high-speed spinning has been industrialized by incorporating the drawing step into the spinning step, omitting it, and increasing the winding speed. One of them is a high-speed spinning process using a heated direct spinning drawing method, which has a reheating zone after a cooling zone. FIG. 2 shows an example of this high-speed spinning process. In FIG. 2, the thermoplastic polymer is melt-spun from the spinneret 7, the yarn is once cooled and solidified by the cooling zone 8 to a temperature below the glass transition temperature, and then passed through the heating zone 9 for heat drawing and heat treatment, and the oiling guide. 10, the running yarn 12 is processed by the entanglement device 11, and 4000 by the first godet roll 13.
It is taken up at a speed of m / min or more, and wound up by the winder 15 via the second Gode roll.

According to this method, a fiber having mechanical properties that can be practically used and is equivalent to the fiber obtained by the conventional two steps of spinning and drawing can be obtained. However, the disadvantage of this method is that if the position or length of the heating zone is not appropriate for the yarn, the optimum drawing tension will not be applied to the yarn and the mechanical properties of the resulting fiber will be insufficient and There is a problem that sex deteriorates. For example, if a heat treatment apparatus is installed at the same position as a normal fiber for clothing having a single yarn fineness of about 2 to 3d and an ultrafine fiber of 1d or less is spun, a drawing tension higher than the optimum drawing tension is applied to the yarn, so Yarn occurs and the resulting fiber has low elongation. If the fiber has a low elongation, the success rate of automatic switching of the winder is deteriorated, or the shape of the winding package is deteriorated, resulting in unevenness of the package end surface. on the other hand,
In the case of a fiber having a single fineness of 4d or more and a large fineness, only a lower drawing tension than the optimum drawing tension is applied to the yarn, resulting in low strength,
Only fibers with high elongation and poor mechanical properties can be obtained.

Further, when melt spinning a high-melting polymer having a high degree of polymerization or a polymer having an ionic group introduced therein, a drawing tension lower than the optimum drawing tension is imparted to the yarn, as in the case of the large fineness yarn. Only fibers with low strength and high elongation and inferior mechanical properties can be obtained. On the contrary, in the case of the low melt viscosity polymer, as in the case of the ultrafine fibers, a drawing tension higher than the optimum drawing tension is applied to the yarn, so that single fiber breakage and / or yarn breakage occurs and the operability deteriorates.

These problems are caused by the drawing tension applied to the drawing point where the yarn entering the heating zone is heated and drawn, and the optimum drawing tension determined by the polymer substrate and the fiber structure before entering the heating zone. It occurs because and do not match. That is, the drawing tension in the heating zone mainly contributes to the air resistance from the spinneret to the heating zone, the distance from the spinneret to the heating zone is long, the single yarn fineness is thin, and the air resistance is high if the take-up speed is high. If the distance is short, the single yarn fineness is large, and the take-up speed is slow, the air resistance decreases and the drawing tension becomes low. Further, the high orientation fiber, the high degree of polymerization polymer or the polymer into which an ionic group is introduced has a high optimal stretching tension, while the low orientation fiber or the low degree of polymerization polymer has a low optimal stretching tension. In this way, not all types of drawing tension can be optimized. In order to solve these problems, there is a conventional example in which the distance from the spinneret to the heating zone is controlled by the single yarn fineness, the take-up speed, the melt viscosity and the like.
See, for example, JP-A 1-225313, JP-A 61-215714 and JP-A 61-231215. In these examples, as the single yarn fineness is smaller, the take-up speed is faster, and the melt viscosity is lower, the heating zone is closer to the die, and when the single-filament fineness is larger, the take-up rate is slower and the melt viscosity is higher, the heating zone is closer to the die. It is stipulated that it should be installed far away, and in actuality, the purpose is to be achieved by moving the heat treatment equipment.

However, in actual production, it is desired to produce a large number of different types of single yarn fineness, take-up speed or polymers with the same heat treatment apparatus, but with the conventional method, the heat treatment apparatus is changed every time the type is changed. In order to move it or adjust the length of the desired heating zone, it is necessary to try to connect the heating tubes in multiple stages. For this reason, there has been a drawback that a new facility is installed and a great deal of labor is required for adjusting the yarn path, resulting in an increase in cost. Further, if the accuracy of the installation position of the heating device is poor, there is a problem that the yarn quality may vary among the devices.

[0007]

DISCLOSURE OF THE INVENTION The present invention has been obtained as a result of repeated studies for solving these problems, and has been achieved for products of different varieties such as single yarn fineness, polymer type and take-up speed. When a fiber is to be produced, the object is to provide a yarn heat treatment device in which the heating zone can be freely set up and down while the yarn heat treatment device is fixed and the heating zone length can be freely selected. is there.

[0008]

SUMMARY OF THE INVENTION The above object is to provide a yarn heat treatment apparatus for heating an atmosphere of a high-speed spun yarn which is once cooled and solidified, and which comprises at least a heating cylinder. This is achieved by a yarn heat treatment device for high-speed spinning, characterized in that a heat insulating cylinder is attached to the inner peripheral surface and is detachably provided.

The present invention will be described in more detail with reference to the drawings. FIG. 1 is a longitudinal sectional view showing an example of a concrete device of the present invention of the yarn heat treatment device 9 in FIG. Figure 1
The yarn heat treatment apparatus of No. 1 comprises a heating cylinder 1, a covering material 2, heat insulating cylinders 3 and 4, and fixing members 5 and 6. The heating cylinder 1 is heated by electric heat. The heating cylinder 1 has a length of 2.5 m, and the heating cylinder 1 has an inner diameter of about 2 to 3 cm. In this example, the heat insulating cylinders 3 and 4 are provided on the inner peripheral surfaces of the heating cylinder 1 at both upper and lower ends.
I am wearing. The upper heat insulating cylinder 3 is fixed to the upper part of the heating cylinder by the fixing member 5, and the lower heat insulating cylinder 4 is fixed to the fixing member 6.
Is fixed to the lower part of the heating cylinder 3. The heat insulating cylinders 3 and 4 have a doughnut-shaped cross section in a portion having a constant thickness, and a "Teflon" coating is applied to the inner peripheral surface.

The heat insulating cylinders 3 and 4 have a thickness of about 1 cm and can sufficiently shield the heat from the inner peripheral surface of the heating cylinder 1. Further, by making the narrowed portion on the inner circumference of the heat insulating cylinder longer, it is possible to prevent the inflow of the accompanying airflow and the outflow of the heating gas due to the pressure loss, and it is possible to precisely control the length of the heating zone. Further, the fixing member 5 of the upper heat insulating cylinder 3 has a conical shape on the upper side to separate the accompanying airflow. Both the upper and lower adiabatic cylinders have a tapered inner end of the heating cylinder from the inner circumference toward the outer circumference, so that the air flow in the heating zone is rectified.

In FIG. 1, an example of heating the heating cylinder by an electric heating system is shown, but a jacket heating system using a heating medium can also be adopted.

The heat treatment apparatus of the present invention can obtain appropriate yarn physical properties for fibers of different types such as single yarn fineness, polymer type, and take-up speed. It is possible to set the optimum position and length of the heating zone for the product type by removing or changing the length, inner diameter, or other shape. In order to enable the heat insulating cylinder to be fixed to the inner peripheral surface of one end or both ends, a method of providing a fixing member on a part of the shape of the heat insulating cylinder or fixing with a fixing member as in the above example is adopted. It is preferable.

The length of the heating cylinder of the heat treatment apparatus may be selected from the balance between the necessity of covering the optimum heating position and length of each product type and the operability, and preferably 1.5 to 4 m. The inner diameter of the heat treatment apparatus is preferably 1 to 10 cm. If it is less than 1 cm, the yarn may come into contact with the inner wall of the heat treatment apparatus or be fused to cause frequent yarn breakage. Again 10
If it is larger than cm, problems such as deterioration of heating efficiency occur.

Further, as the material of the heat insulating cylinder, it is preferable to use a material coated with "Teflon" or the like on the surface in order to prevent fusion with the yarn and enhance the durability of the heat insulating cylinder itself. There is no limitation, and commonly used materials can be applied. When the heat-insulating cylinder has a concentric cross-section, the outer diameter of the heat-insulating cylinder is slightly smaller than the inner diameter of the heat treatment apparatus, and the inner diameter is preferably 7 mm or more from the viewpoint of securing the yarn path, but is particularly limited. is not. Further, in order to enhance the heat insulating effect, the heat insulating cylinder is preferably provided with a narrowed portion as in the above example.

[0015]

EFFECTS OF THE INVENTION By using the yarn heat treatment apparatus for high speed spinning of the present invention, the distance from the spinneret to the heating zone can be changed according to the product type even when the heat treatment apparatus is fixed, and the heat treatment apparatus is fixed. Various types of products can be produced as they are. Therefore, it is possible to solve the problems of the addition of new equipment for moving the heat treatment apparatus, the adjustment of the yarn path, the accuracy of installation of the heating apparatus, etc.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an example of a yarn heat treatment apparatus of the present invention.

FIG. 2 is a schematic view showing an example of a process of high-speed yarn production by a generally employed heating direct spinning drawing method.

[Explanation of symbols]

 1: Heating cylinder 2: Covering material 3, 4: Thermal insulation cylinder 5, 6: Fixing member 7: Spindle 8: Cooling zone 9: Yarn heat treatment device 10: Focusing lubrication guide 11: Entanglement device 12: Running yarn 13: No. 1 god roll 14: second god roll 15: high speed winder

Claims (1)

[Claims] 1. A yarn heat treatment apparatus for heating an atmosphere of a high-speed spun yarn once cooled and solidified, comprising at least a heating cylinder, wherein a heat insulating cylinder is attached to an inner peripheral surface of one end or both ends of the heating cylinder. A yarn heat treatment device for high-speed spinning, which is provided so that it can be pulled out freely.