JPH03104910A - Apparatus for melt spinning - Google Patents

Abstract

PURPOSE:To make atmospheric temperature under a spinneret uniform by arranging annular heaters on the outside of a supporting frame surrounding spinning packs and simultaneously providing platy heat insulating materials so as to sandwich the respective corresponding spinnerets between the heater and supporting frame. CONSTITUTION:Rectangular or elliptical annular heaters 8 fixed to the outside of a supporting framed therethrough so as to surround plural spinning packs at positions under spinning packs 1 of an apparatus for melt spinning thermoplastic synthetic fiber in which the plural spinning packs are assembled in the longitudinal direction are arranged and platy heat insulating materials 86 are simultaneously provided so as to sandwich the respective corresponding spinnerets 2 between the annular heaters and the supporting frames. Thereby, atmospheric temperature surrounding filaments is made uniform and products of good quality without any unevenness in yarn quality among the respective filaments are stably obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention is applicable to thermoplastic synthetic M&
The present invention relates to a melt-spinning apparatus for fibers, and more particularly to a melt-spinning apparatus for uniformizing the ripening atmosphere below the spinneret.

(Prior art) In general, when thermoplastic polymers such as polyamides and polyesters are melt-spun, and in particular when performing high-speed spinning or high-speed spinning and drawing, Japanese Patent Application Laid-Open No. 62-33815 describes how to do this industrially advantageously. As described above, a multi-spindle spinning method is used in which a plurality of spinning packs are arranged in a row on a spin block and a plurality of threads spun from the spinning packs are simultaneously processed in the same spinning tube.

In such a spinning device, the packs located at both ends are heated from three sides, so the temperature tends to be higher than that located in the middle, which tends to cause differences in the physical properties of the spun yarn. In this case, if the yarn spun from the spinneret is slowly cooled or is equipped with a delayed cooling section equipped with a heating cylinder or the like to delay the cooling, the yarn may flow down in a cylindrical shape inside the rectangular heating cylinder. The yarn (filament details) is close to the heating cylinder (single yarn (filament) that passes through the O position)
However, the drums are also greatly affected by the temperature, and the uneven temperature further increases the temperature.

This, together with the effects of rising and descending air currents generated in the delayed cooling section, results in the largest temperature unevenness or variation occurring in the delayed cooling section9.As a result, the atmospheric temperature surrounding the spun yarn is not uniform; There is a difference in the ambient temperature of each spindle, and the thread quality of each spindle is uneven, especially dyeing difference (spots).
The problem was that it got bigger.

(Purpose of the Invention) The present invention has been made to solve such conventional problems, and is particularly applicable when a heater such as a heating cylinder is installed below the spinneret to perform zone heating of the yarn. The object of the present invention is to provide a melt-spinning apparatus that can uniformize the temperature of the atmosphere surrounding the yarns and stably produce products of excellent quality without uneven yarn quality between the yarns.

(Structure of the Invention) That is, the present invention provides a melt-spinning apparatus for thermoplastic reed fibers incorporating a plurality of spinning packs in the longitudinal direction. A rectangular or oval annular heater is fixed to the outside of the support frame via the support frame, and a plate-shaped heat insulating material is placed between the annular heater and the support frame so as to sandwich the corresponding spinneret. This is the characteristic of the melt spinning equipment.

(Example) Hereinafter, the present invention will be explained with reference to the drawings. Figure 9 is a vertical cross-sectional view showing an example of the present invention, Figure 2 is a cross-sectional view taken along line A-A in Figure 1, and Figure 3 is a cross-sectional view taken along line A-A in Figure 1. It is a BB sectional view of FIG. 2.

In the figure, ■ is a spinning pack attached to a spin block l3, and a spinneret 2 that discharges a plurality of molten polymers.
have.

Reference numeral 3 denotes a shutter for preventing the yarn cooling air from the spinning tube 9 from blowing up unevenly in the direction of the spinneret 2 and for securing the delayed cooling section 5. It has a thread passage opening 4, and can be divided at the center so that it can be pulled out to the left and right. 6 is a heating block for shaping the delayed cooling section 5;

The heating block 6 includes a hollow rectangular heat retention ([thermal]) block 7 and a heater 8 built into the inner peripheral side thereof.

As shown in FIGS. 2 and 3, the heater 8 is a heating element (preferably a sheath heater, but any other heating element may be used) 83, which mainly consists of a plate-shaped heat transfer frame 8l and a sheath heater wound around the outside thereof. The sheath heater 83 is fixed to a bracket 84 having a T-shaped cross section.

85 is a fixing bolt. The heat transfer frame 81 is carved with a bank 82 having a width d somewhat larger than the outer diameter D of the base 2 on the outside thereof, and a heat insulating plate 86 having a thickness almost equal to the depth of the bank is attached to this bank 82, and a holding plate 87 is attached. Yoshi)
It is fixed. In this case, it is preferable to make the groove 82 large so that the size of the heat insulating plate 86 can be changed freely, or to carve grooves around the entire circumference, since this allows fine adjustment of heat transfer. When changing the size of the heat insulating board, if there is a gap, it can be filled with the same material as the heat transfer frame or a special material.

]0 is a cooling air outlet located at the upper part of the spinning tube 9, and has a cooling air outlet (surface) L L and a cooling character 12.

Reference numeral 14 designates an exhaust hole provided to prevent the decomposition gas from evaporating, and reference numeral 15 designates a shield for cooling the entire body by exhaust air.

In such an apparatus, the yarn y discharged from the spinneret 2 is passed through a delayed cooling section 5 surrounded by a guide shutter 7.
It flows down into the cooling chamber 2, where it is cooled and solidified by the cooling air blown out from the air outlet L1. In this case, the temperature of the atmosphere in which the falling yarn is removed is not uniform due to the turbulence of updrafts or downdrafts in the delayed cooling section.Furthermore, with the conventional surrounding heater, temperature non-uniformity is further increased. I encouraged it. As a result of numerous experiments and analyses, in the present invention, the heat transfer from the heating element is controlled by a silent plate placed at a specific position on the face of the heating element, thereby making the atmosphere heating of each cone constant. .

That is, a board 86 having a width slightly larger than the external diameter D of the cap 2 is arranged on one side of the ripe body 83 to shield it, and a heat transfer frame 81 corresponding to the part not covered by the heat insulating board 86 is arranged. The filament I flowing down in a cylindrical shape from The atmospheric temperature surrounding the yarn (filament group) y remains nearly constant.

In this case, various means can be used to control the ambient temperature, but a simple one such as controlling one point of the temperature of the generator 83 to a predetermined temperature with a temperature controller or the like can keep the entire atmosphere almost uniform. The temperature can be sufficiently controlled.In addition to the length example above, the yarn passage opening of the shutter 3, 1
If a guide shaft is provided that extends around the spinning pack four times along the spinneret and extends into the vicinity of the spinning pack 1 while gradually reducing the cross-sectional area, it is possible to reduce the accumulation of polymer decomposition residue under the spinneret. Therefore, it is preferable that the upper opening of such a guide shirt starter is sized so that the length of the short side is slightly larger than that of the spinneret 2, and the length of the long side is also slightly longer than the positions of the spinnerets at both ends. Good.

Although the above example has been described with four spinnerets, it goes without saying that the present invention is not limited to this, but can be similarly applied to cases with two to three or five or more spinnerets.

Using a melt-spinning (stretching) apparatus as shown in Figures I to 3, with a relative viscosity of 0.64 and a titanium oxide content of 0-3% by weight.
Polyester chips were spun at a temperature of 295°C and a spinning speed of 3.
Spinning at 500 m/min, drawing speed 5500 m/min, 7
A yarn of 5 denier/36 filaments was obtained.9 In this case, the yarn obtained with the same yarn r as described above and the dyed As a result of comparing the difference in wear, the conventional example had a score of 1-2 points, while the difference in the present example had a marked improvement of 0.4 points.

In addition, the denier fluctuation rate and uniformity U% are much better than before.

<Effects of the Invention> As explained above, according to the present invention, the temperature of the atmosphere surrounding the falling yarn at the lower position of the spinneret can be uniformly adjusted, and products of excellent quality can be stably obtained especially during high-speed spinning. becomes possible. Moreover, the device itself does not require complicated installation and is low cost, which has a great advantage in terms of equipment cost.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view showing an embodiment of the present invention, and Fig. 2 is a longitudinal sectional view showing an embodiment of the present invention.
Figure 3 is the BB cross-sectional view of the 2nd f/I. Ripe frame 83-・Heating element 86--・Ripe board Fig. 2 Fig.

Claims (1)

[Scope of Claims] 1. In a thermoplastic synthetic fiber melt spinning apparatus incorporating a plurality of spinning packs in the longitudinal direction, a support frame is provided at a position below the spinning pack so as to correspond to and surround the plurality of spinning packs. A rectangular or oval annular heater fixed to the outside of the support frame is provided through the support frame, and a plate-shaped heat insulating material is provided between the annular heater and the support frame so as to sandwich each corresponding spinneret. Features of melt spinning equipment. 2. The melt spinning apparatus according to claim 1, wherein the heat insulating material is detachably attached.