JPS6142922Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a spinneret device for melt spinning synthetic fibers. As a conventional melt-spinning spindle device for synthetic fibers, for example, the one shown in FIG. 1 is known. To explain the structure of this cap device, numeral 1 is a case in which a material layer 2 is housed, and molten polymer metered by a gear pump (not shown) is supplied to the upper end of this material layer 2. Case 1
A cap 3 is fixed to the lower end of the cap 3.
As shown in detail in FIG. 2, an introduction hole 4 and a spinning pore 5 communicating with the introduction hole 4 are formed along its outer periphery. The spinneret 3 is divided into two blocks by a dividing band 6 provided approximately in the center thereof, and this dividing band 6 has a diameter of 10 mm to facilitate winding of the synthetic fibers spun from the spinning pores 5. The width is as follows. As shown in FIG. 1, a perforated plate 7 is further interposed between the aforementioned material layer 2 and the base 3, and the perforated plate 7 is provided with a large number of communicating holes 8. A recess 9 is formed in the lower end surface of the perforated plate 7, and the communication hole 8 communicates with the introduction hole 4 via this recess 9. The case 1 described above is heated by a heating means (not shown) disposed around its outer periphery, and the molten polymer supplied to the material layer 2 is passed through the communication hole 8, the recess 9, and the introduction hole 4 into the spinning pore 5. Two multifilament synthetic fibers are produced. However, in such a conventional melt-spinning die device, the molten polymer that has passed through the communication hole 8 flows directly into one of the introduction holes 4 through the small-volume recess 9, so that the outer periphery of the case 1 The molten polymer passes through the communicating hole 8 formed in the central part of the perforated plate 7 far from the molten polymer, and the temperature decreases.
It is not possible to flow into the water on an average basis, and the water flows into one of the introduction holes 4 biasedly. As a result, the multifilament synthetic fiber produced had the problem of frequent occurrence of denier irregularities. As a result, the quality of manufactured synthetic fibers has deteriorated and the incidence of defective products has increased. In addition, a melt-preventing cap device was developed in 1973, in which a throttle plate with a throttle hole in the center was provided between a perforated plate having a large number of communicating holes on the entire surface and the cap to prevent abnormal retention of polymer. This device is proposed in Japanese Patent No. 4996, but like the conventional device, the temperature of the molten polymer passing through the communication hole in the center of the perforated plate becomes low, making it impossible to obtain uniform multifilaments. Furthermore, a melt-prevention cap device that combines a perforated plate with a plurality of concentric rows of communication holes and a throttle plate with a throttle hole in the center is disclosed in Japanese Patent Publication No. 44-22524.
This device is described in Japanese Utility Model Application Publication No. 50-30012, and although the temperature unevenness of the molten polymer is relatively small, since the communicating holes of the perforated plate are unevenly distributed near the outer periphery, the temperature difference after filtration is The polymer is not uniformly diffused, and as a result, even if it is focused through the aperture, the kneading effect is not improved and it is still not possible to prevent the occurrence of denier unevenness. This idea was created by focusing on these conventional problems, and consists of a material that allows the molten polymer to pass through, a perforated plate that has many communicating holes all over its surface located downstream of the material, and a perforated plate that A plurality of blocks each having a plurality of spinning pores are arranged downstream of the perforated plate, and includes a spinneret provided at a constant distance from each other via a dividing band, and a case for storing the material and the spinneret, and the perforated plate and A first passage that guides the polymer after passing through the perforated plate to the vicinity of the outer circumference of the case, and a second passage that converges the polymer after passing through the first passage near the dividing zone are provided between the cap and the base, and the polymer after passing through these passages is provided. It is an object of the present invention to solve the above-mentioned problems by providing a melt-spinning spinneret device characterized in that the polymer can flow into the spinning pores of each block. This invention will be explained below based on the drawings. FIG. 3 is a diagram showing an embodiment of this invention,
First, the configuration will be explained. Reference numeral 11 denotes a case, and a heating means 12 is provided on the radially outer side of the case 11. A space 13 is formed in this case 11, and the upper end of this space 13 is filled with a material 14. A supply hole is opened at the upper end of this space 13, and this supply hole is connected to a discharge hole of a gear pump (not shown). On the other hand, a perforated plate 15 is housed in the lower end of the space 13.
This porous plate 15 is in contact with the material 14 via a wire mesh 16 for supporting the material. As shown in detail in FIG. 4, the perforated plate 15 has a large number of communicating holes 17 formed over its entire surface, and these communicating holes 17 open into recesses 18 provided at the lower end of the perforated plate 15. . Again in FIG. 3, the lower end of the space 13 is closed by a base 19, which is connected to two blocks 21, 2 by a dividing band 20, as shown in detail in FIG.
It is divided into 2. two blocks 21, 22
Introduction holes 23 are bored along the outer periphery of the , and the introduction holes 23 are provided at the lower ends of these introduction holes 23.
Spinning pores 24 of smaller diameter are connected. The aforementioned dividing zone 20 is the spinning pore 2 of each block 21, 22.
It has a width of 10 mm or more so as not to interfere with the winding operation of the multifilament synthetic fibers spun from each of the fibers. Again, in FIG. 3, a distribution plate 25 and a focusing plate 26 are interposed between the perforated plate 15 and the base 19, and the upper end of the distribution plate 25 has a recess 18 as shown in detail in FIG. It has a plurality of open vertical passages 27, a collective passage 28 formed at the center of the lower end of the distribution plate 25, and a radial passage 29 connecting the vertical passages 27 and the collective passage 28. The vertical passage 27 is provided at the outer periphery equidistant from the center of the distribution plate 25, that is, near the heating means.
constitutes the first passage 30 as a whole. The first passages 30 do not necessarily need to be provided in one row, but may be provided in multiple rows. The focusing plate 26 has a seventh
As shown in detail in the figure, the second
A central hole 31 is formed as a passage, and the lower end of this central hole 31 opens into a recess 32 .
The central hole 31 and the recess 32 have a necessary and sufficient volume for the polymer flowing from the radial passage 29 to lose its flow velocity and become approximately equal in pressure, and the recess 32 communicates with the introduction hole 23 described above. . Next, the effect will be explained. The molten polymer metered by a gear pump is supplied into the space 13,
It is passed by the material 14 while descending in the space 13. Thereafter, the molten polymer flows through the wire mesh 16 into the communication holes 17 formed on the entire surface of the perforated plate 15, and after being diffused, the recesses 18 are filled. The temperature of this molten polymer differs depending on the position of the space 13 through which it has passed and the position of the communicating hole 17, since the case 11 is heated from its outer peripheral surface. The molten polymers at different temperatures pass through the first passage 30.
and the central hole 31, and these first passages 30
and are mixed while passing through the central hole 31, and in particular, since the vertical passages 27 are equidistant from the center of the distribution plate 25, their temperature becomes uniform. The molten polymer flows into the introduction hole 23 from the recess 32 and then passes through the spinning pore 24.
It is spun from the fiber and wound on a winding device as a multifilament synthetic fiber. In this way, when multifilament synthetic fibers are produced using the melt spinning nozzle device of this invention, the polymer is first diffused through the communicating holes drilled on the entire surface of the perforated plate, and then through the first passage. The temperature of the polymer is made uniform by guiding it to the vicinity of the outer periphery of the case, and then converging it to the vicinity of the dividing zone by the second passage, so that the polymer in each spinning pore 24 is uniformly kneaded. Moreover, since the temperature is constant, denier unevenness is less likely to occur in synthetic fibers, improving quality and reducing the incidence of defective products. The attached table compares the denier difference ratio of synthetic fibers (polyester fiber, 183 denier, 24 filament) produced using the conventional clasp device and the case of using the clasp device of this invention. This shows that the cap device according to the present invention is advantageous in preventing the occurrence of denier unevenness.
Note that the denier difference rate is defined by the following formula. Denier difference ratio = denier difference of multifilaments in the same die device / average denier of multifilaments in the same die device × 100 As explained above, according to this invention, the molten polymer in each spinning pore is It is possible to maintain a uniform temperature, reduce the occurrence of denier unevenness that occurs in manufactured synthetic fibers, improve the quality of synthetic fibers, and reduce the incidence of defective products. Effects can be obtained. 【table】

[Brief explanation of the drawing]

Fig. 1 is a front sectional view of a conventional melt spinning spinneret device, Fig. 2 is a plan view of the spinneret shown in Fig. 1, and Fig. 3
The figure is a front cross-sectional view showing one embodiment of the melt spinning nozzle device according to this invention, FIG. 4 is a plan view of the perforated plate shown in FIG. 3, and FIG. 5 is a plan view of the nozzle shown in FIG. 3. , FIG. 6 is a plan view of the distribution plate shown in FIG. 3,
FIG. 7 is a plan view of the focusing plate shown in FIG. 3. 12... Heating means, 14... Material, 15... Perforated plate, 17... Communication hole, 19... Cap, 20...
Dividing zone, 21, 22...block, 24...spinning pore, 30...first passage, 31...second passage.

Claims (1)

[Scope of utility model registration request] A filter medium for filtering heated and melted polymer, a perforated plate located downstream of the filter medium and having a large number of communicating holes all over its surface, and a plurality of blocks each having a plurality of spinning pores located downstream of the perforated plate. In a melt-spinning spinneret device comprising spinnerets provided at a constant distance from each other via a dividing band, and a case for storing a filter medium and the spinneret, a perforated plate is provided between the perforated plate and the spinneret in the case. A first passage that guides the polymer after passing through the case near the outer periphery of the case, and a second passage that focuses the polymer after passing through the first passage near the dividing zone are provided, and the polymer passes through these passages and is spun into each block. A melt-spinning spinneret device characterized by allowing flow into pores.