JP2013067919A - Melt spinning apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a melt spinning apparatus capable of, even when performing conjugate spinning of a plurality of polymers, or supplying molten polymers to a number of spinning pack housings from one metering pump, uniformizing heat history of the molten polymers.SOLUTION: There is provided a melt spinning apparatus for supplying molten polymers divided by a distribution pipe from an extruder to a plurality of spinning packs through a plurality of metering pumps and melt-spinning the polymers. In the apparatus, the distribution pipe is tournament-branched so that passage times of the polymers in the distribution pipe between the extruder and the metering pumps become the same, the number of polymer paths 4-1, 4-2 and 4-3 leading to a plurality of spinning pack housings 5-1, 5-2 and 5-3 from the metering pumps is 3 or more and 12 or less, and the inner cross-sectional areas and the lengths of the polymer paths are different from each other so that the passage times of the polymers become the same.

Description

  The present invention relates to a melt spinning apparatus for melt spinning single component fibers and composite component fibers made from thermoplastic synthetic resins such as polyester and polyamide.

  In general, when melt spinning a synthetic fiber made of a thermoplastic synthetic resin such as polyester or polyamide, the molten polymer subdivided by a distribution pipe from an extruder is further fed into a plurality of spinning packs via a plurality of metering pumps. It is supplied and finally spun from the base provided in the spin pack to be fiberized.

  At this time, it has been proposed that the polymer piping system for transporting the molten polymer has a tournament branch in order to maintain the same polymer residence time (see Patent Document 1 and Patent Document 2).

  In addition, it has also been proposed that there are a plurality of polymer passages leading from a metering pump to a plurality of spin packs (see Patent Document 3).

  However, with this alone, piping becomes complicated and large in size when a polymer is supplied to a large number of spin pack housings from a composite spinning of a plurality of polymers in recent years and a single metering pump. In this case, there is a serious problem that a polymer having severe thermal deterioration has a long residence time and the polymer residence time of each weight cannot be made the same.

JP 2004-232107 A (page 5, [0024]) JP 09-31739 A (page 8, FIG. 1) Japanese Patent Laying-Open No. 2005-9090 (page 9, FIG. 1)

  Accordingly, an object of the present invention is to provide a composite spinning of a plurality of polymers, or a melt spinning apparatus for supplying a molten polymer to a plurality of spin pack housings from one metering pump, with a compact polymer passage and a short polymer residence time. An object of the present invention is to provide a melt spinning apparatus capable of making the thermal history received by a polymer uniform by making the respective residence time of the polymer polymers equal.

The present invention is to solve the above-mentioned problems, and the melt spinning apparatus of the present invention subdivides the molten polymer extruded from the extruder and the molten polymer and supplies it to the metering pump. In a distribution pipe and an apparatus for melting and spinning the finely divided molten polymer through a plurality of metering pumps through a polymer passage to a plurality of spinning pack housings,
The distribution pipe is configured to branch to a tournament so that the polymer passage times of the distribution pipe from the extruder to the metering pump are the same, and the polymer passage connected from the metering pump to a plurality of spin pack housings Is a melt spinning apparatus characterized in that the internal cross-sectional area and the length of the polymer passage are different so that the polymer passage time is the same and the polymer passage time of the polymer passage is the same. .

  According to a preferred aspect of the melt spinning apparatus of the present invention, the polymer passage is constituted by a flow path constituting member formed by stacking plate members having grooves.

  According to a preferred aspect of the melt spinning apparatus of the present invention, the melt spinning apparatus is a composite spinning machine that spins two or more kinds of molten polymers.

  According to a preferred aspect of the melt spinning apparatus of the present invention, the spinning pack is inserted into the spinning pack housing from above.

  According to a preferred aspect of the melt spinning apparatus of the present invention, the composite spinning pack is fixed using a member that does not cause an inclination.

  According to the present invention, in a melt spinning apparatus for supplying a molten polymer to a plurality of spin pack housings from a plurality of polymer composite spinning or a single metering pump, the polymer passage is compact, the polymer residence time is short, The weight polymer residence time can be made the same, the spin pack can be easily mounted, and no spots are generated in the die surface temperature. A synthetic fiber melt-spinning apparatus is provided in which the heat history received by the polymer can be made uniform and the quality of each yarn can be made uniform.

FIG. 1 is a schematic diagram showing an example of an overall view of a synthetic fiber melt spinning apparatus. FIG. 2 is a schematic plan view illustrating a spinning pack housing from a metering pump of a conventional synthetic fiber melt spinning apparatus. FIG. 3 is a schematic plan view illustrating an example of a spin pack housing from a metering pump of the synthetic fiber melt spinning apparatus of the present invention. FIG. 4 is a cross-sectional view taken along the line AA in FIG. 5 is a cross-sectional view taken along the line BB in FIG. FIG. 6 is a cross-sectional view showing details of a portion C in FIG. FIG. 7 is a cross-sectional view showing an example of the shape of a polymer passage of the synthetic fiber melt spinning apparatus of the present invention. FIG. 8 is a schematic side view showing an example of a state in which the composite spinning pack is inserted from above. FIG. 9 is a schematic front view showing an example of the prior art as seen from the Z direction of FIG. FIG. 10 is a schematic front view showing an example of the present invention as seen from the Z direction of FIG.

  In introducing the melted thermoplastic polymer of the present invention, such as polyester or polyamide, to the spin pack, it is important to make the thermal history received by the polymer until entering the spin pack uniform. Therefore, in the melt spinning apparatus, the polymer passage time of the distribution pipe between the extruder and each metering pump is the same, and the polymer passage time of the polymer passage leading from the metering pump to the plurality of spin packs is the same. It is important that the polymer passages leading from the metering pump to the plurality of spin packs are 3 or more and 12 or less, and that the internal cross-sectional areas of the polymer passages are different.

  In the present invention, the fact that the polymer passage times in the polymer passages are the same means that the variation in the polymer passage time is within 10% at the maximum in each spin pack housing.

  In the case of polyester, for example, the inner diameter of the pipe is determined so that the polymer residence time from the extruder to each spin pack housing is within 10 minutes and the pressure loss of the polymer is 10 Mpa or less. The variation within 10% at the maximum means, for example, that the polymer residence time is within 48 seconds in each spin pack housing when the polymer residence time is 8 minutes.

  If this variation exceeds 10%, the heat history applied to the molten polymer is different, which affects the yarn physical properties. This is because when the time during which the molten polymer is exposed to a high temperature is long, the thermal deterioration proceeds, and in particular, the high viscosity molten polymer has a great influence.

  In recent years, in order to make the melt spinning machine compact, the number of ports of the metering pump has been increased. The aim is to reduce the number of motors, reducers and switches that drive the metering pump. Therefore, in order to make the melt spinning machine compact, in the present invention, the polymer passage leading from the metering pump to the spinning pack is set to 3 or more, and the scale of the yarn winding machine is set to 12 or less. Winders exceeding 12 yarns have poor operability and workability.

  The melt spinning apparatus of the present invention includes the function of a composite spinning machine that spins two or more kinds of polymers. The term “two or more types of polymers” used herein means different polymers, polymers having different viscosities or polymers having different properties.

  In the present invention, the molten polymer discharged and supplied from the metering pump to the plurality of spin packs is guided to the spin pack housing through a flow path component formed by stacking plate-like members having grooves. A melt spinning apparatus is obtained.

  FIG. 1 is a schematic diagram showing an example of the entire melt spinning apparatus for synthetic fibers of a single component polymer. In FIG. 1, the cooling device, oiling device, take-up device, and winder device are not shown. In FIG. 1, the polymer melted by the extruder 7 is normally tournament-distributed and subdivided by a polymer pipe 6 as shown in the figure. That is, the polymer discharged from the extruder 7 is divided into two by piping having the same inner diameter and the same length. Then, it is further divided into two by the same length and the same length of piping. After that, the metering pump 8 (three ports are shown in this figure) performs constant metering, and one of the three ports is guided through the polymer pipe 6-1 to one 5-1 of the spin pack housing. . The remaining two ports are also guided through polymer pipes 6-2 and 6-3, respectively, to one of the spin pack housings 5-2 and 5-3.

  FIG. 2 is a schematic plan view showing an example from a metering pump to a spin pack housing of a conventional synthetic fiber melt spinning apparatus.

  FIG. 1 shows an example using a single component polymer for the sake of clarity, but FIG. 2 shows an example using a three-component (A component, B component, and C component) polymer. Molten polymer delivered from metering pumps (not shown) of the respective components is sent to the spin pack housing 5 (5-1, 5-2 and 5-3). In that case, in each component, it is desirable that the polymer pipes 6 (6-1, 6-2, 6-3,...) Have the same volume. Therefore, conventionally, since the inner diameter of the polymer pipe 6 is determined by the standard, the polymer pipe 6 having the same size is used. Therefore, as shown in FIG. 2, the polymer pipe 6-1 near from the metering pump to the spin pack housing 5 is twisted and lengthened so that the polymer retention volume is the same as that of the far polymer pipe 6-3. Now, as you can easily imagine, there are many types of polymers, and the more ports out of the metering pump, the more complex and larger the spinning machine.

  The polymer passage block 1 serving to guide the polymer discharged from the metering pump to the spin pack housing is a member for connecting the spin pack housing 5 and the metering pump.

  The A component polymer passage 2 indicates a passage for guiding the polymer discharged from the metering pump to the spin pack housings 5-1, 5-2, and 5-3. The same applies to the B component polymer passage 3. The same applies to the C component polymer passage 4.

  FIG. 3 is a schematic plan view showing an example from the metering pump to the spin pack housing of the synthetic fiber melt spinning apparatus of the present invention.

  For example, in the case of component C, the melted polymer sent from the metering pump has the same internal volume of 4-1, 4-2, 4-3. The cross-sectional area is large and the length is guided to the spin pack housing 5-1 through the short C component polymer passage 4-1. Similarly, the farthest spin pack housing 5-3 is led to the farthest spin pack housing 5-3 through the C component polymer passage 4-3 having a small internal cross-sectional area and a long length. Similarly, the intermediate spin pack housing 5-2 is led to the spin pack housing 5-2 through the medium internal cross-sectional area and the medium length C component polymer passage 4-2. These are shown in FIG. 5 (a cross-sectional view of the B part in FIG. 4).

  That is, it is important to make the internal cross-sectional area and length of the polymer passages different so that the polymer passage times of the polymer passages are the same.

  4 is a cross-sectional view of the A section in FIG. In FIG. 4, the A component polymer passage 2 shows a state immediately before the molten polymer fed from the metering pump enters the spin pack housing 5. This leads the polymer to part A of the spin pack shown in FIG. Similarly, the B component polymer passage 3 leads the polymer to the B portion of the spin pack shown in FIG. Similarly, the C component polymer passage 4 leads the polymer to the C portion of the spin pack shown in FIG.

  FIG. 6 is a cross-sectional view showing details of a portion C in FIG. That is, a plurality of grooved plates 14 are stacked and fixed with bolts 13 to form a polymer passage. By doing so, a polymer passage having an arbitrary cross-sectional area can be obtained. The need for overlapping grooved plates 14 is to machine the grooves. This is because it is difficult to drill a hole in the block because the polymer passage is bent.

  In addition, by making the polymer passage in such a structure that can be dismantled, it is easy to wash the polymer, and it is easy to confirm whether or not the washing is possible. This is an important point for producing a wide variety of polymers.

  FIG. 7 shows an example of the cross-sectional shape of the polymer passage in the synthetic fiber melt spinning apparatus of the present invention. The cross-sectional shape of the polymer passage may be a quadrangle as shown on the left side of FIG. 7, but abnormal stagnation of the molten polymer can be prevented by using a curved surface with as few edges as possible as shown on the right side of FIG. 7. Of course, the cross-sectional shape of the polymer passage is preferably circular as shown in FIG.

  FIG. 8 shows a state in which the composite spinning pack 9 is inserted from above. When trying to filter a plurality of molten polymers, the composite spin pack becomes large and heavy. For this reason, work cannot be performed only by hand, and an assisting device such as a hoist or a chain block is required. Therefore, the workability is superior when the composite spinning pack 9 is inserted from above.

  However, as shown in FIG. 9 (a conventional example is shown in the view seen from the Z direction in FIG. 8) with the screw 10 that presses the packing 11 for sealing the molten polymer, the composite spin pack 9 is moved to an arrow (←). The force to tilt in the direction works. As a result, the lower left of the composite spin pack 9 comes into contact with or approaches the spin pack housing 5, resulting in a higher temperature than the lower right. As a result, the molten polymer temperature in the composite spinning pack 9 also rises, and left and right ejection spots are generated due to the lowered molten polymer viscosity.

  A method for preventing this is shown in FIG. FIG. 10 shows an example of the present invention as seen from the Z direction of FIG. That is, the stopper 12 is provided so that the composite spinning pack 9 does not tilt. This may be attached to the spin pack housing 5 side as shown in FIG. 10, or may be attached to the composite spin pack 9 side.

  By using the melt spinning apparatus of the present invention, for example, when changing from a colored polymer to a transparent polymer, it can be confirmed that the previous polymer is surely cleaned. In addition, polytrimethylene terephthalate and high-viscosity polyester that are severely thermally deteriorated are particularly effective because the residence time of the polymer can be minimized. Other polymers are effective because they have the property of thermal degradation.

1: Polymer passage block for guiding the polymer discharged from the metering pump to the spin pack housing 2: A component polymer passage 3: B component polymer passage 4: C component polymer passage 5: Spin pack housing 6: Polymer pipe 7: Extruder 8: Metering pump 9: Composite spinning pack 10: Pressing screw 11: Packing 12: Stopper 13: Bolt 14: Grooved plate

Claims (5)

  An extruder for extruding the molten polymer, a distribution pipe for subdividing the molten polymer extruded from the extruder and supplying it to the metering pump, and a plurality of the subdivided molten polymers via a plurality of metering pumps through the polymer passage, In the apparatus for supplying and melt-spinning to a single spinning pack housing, the distribution pipe is configured to branch to a tournament so that the polymer passage times of the distribution pipe between the extruder and the metering pump are the same, respectively. The internal cross-sectional area and the length of the polymer passage are set so that the polymer passage leading from the metering pump to the plurality of spin pack housings is 3 or more and 12 or less, and the polymer passage time of the polymer passage is the same. A melt spinning apparatus having a different configuration.   2. The melt spinning apparatus according to claim 1, wherein the polymer passage is constituted by a flow path constituting member formed by stacking plate-like members having grooves.   3. The melt spinning apparatus according to claim 1, wherein the melt spinning apparatus is a composite spinning machine that spins two or more kinds of molten polymers.   The melt spinning apparatus according to any one of claims 1 to 3, wherein the spinning pack is configured to be inserted into the spin pack housing from above.   The melt spinning apparatus according to any one of claims 1 to 4, wherein the composite spinning pack is fixed using a member that does not tilt the composite spinning pack.

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