Melt Spinning Equipment

Abstract

To improve heat supply efficiency from a heating box body to a spinning pack and prevent heat supply to the spinning pack from being uneven in a circumferential direction.SOLUTION: A melt spinning device 1 has a cylindrical spinning pack 2 having a spinneret 21, a heating box body 3 that has a concavity 32 into an inner space of which the spinning pack 2 is inserted and which is open downward, and a heat transfer mechanism 4 that can contact an outer peripheral surface of the spinning pack 2 inserted into the concavity 32 and has a divided member 42 that is divided into a plurality with respect to a circumferential direction of the spinning pack 2. When the spinning pack 2 is inserted into the concavity 32, members of the heat transfer mechanism 4 including the divided member 42 constitute a heat transfer path from the wall surface demarcating the concavity 32 of the heating box body 3 to the outer peripheral surface of the spinning pack 2.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a melt spinning apparatus for spinning polymers. [Background technology]

[0002] Generally, a melt spinning apparatus includes a heating box heated to a temperature equal to or higher than the melting point of the polymer, and a spin pack removably attached to the heating box. In the melt spinning apparatus, molten polymer is supplied to the spin pack through a polymer flow path formed inside the heating box, and is spun out from a spinneret of the spin pack.

[0003] For example, as shown in Patent Document 1, a heating box is formed with a recess that opens downward and into which a spinning pack is inserted. A pack mounting section for mounting the spinning pack is provided within the recess. A gap of about 1 mm exists between the heating box and the spinning pack, more specifically, between the wall surface that defines the recess formed in the heating box and the outer circumferential surface of the spinning pack mounted in the pack mounting section. Heat is supplied from the heating box to the spinning pack mounted in the pack mounting section through an air layer that exists in the gap between the heating box and the spinning pack. Because the thermal resistance of the air layer is relatively large, there is a problem in that heat from the heating box is not sufficiently transmitted to the spinning pack.

[0004] The spinning pack of the melt spinning device disclosed in Patent Document 2 (called a spinneret pack in Patent Document 2) has a tapered outer periphery of the spinneret. This melt spinning device also includes a ring-shaped heating block whose inner periphery is tapered in the same direction and in the same inclination as the tapered shape of the spinning pack. The heating block is disposed so as to contact the outer periphery of the spinneret in the spinning pack. This allows heat from the heating block to be transferred to the spinning pack without passing through an air layer. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-102435 [Patent Document 2] Japanese Utility Model Application Publication No. 60-86569 Summary of the Invention [Problem to be solved by the invention]

[0006] In Patent Document 2, a ring-shaped heating block is brought into contact with the outer peripheral surface of the spinneret of the spinning pack. Therefore, the contact between the heating block and the spinning pack may become uneven due to factors such as the machining accuracy of the components or misalignment between the heating block and the spinning pack. As a result, heat is supplied to the spinning pack unevenly in the circumferential direction.

[0007] An object of the present invention is to provide a melt spinning device that can improve the efficiency of heat supply from a heating box to a spinning pack and can prevent the heat supply to the spinning pack from becoming uneven in the circumferential direction. [Means for solving the problem]

[0008] The melt spinning apparatus of the first invention comprises a cylindrical spinning pack having a spinneret, a heating box having a recess that opens downward into its internal space into which the spinning pack is inserted, and a heat conduction mechanism that is capable of contacting the outer surface of the spinning pack inserted into the recess and has a dividing member that is divided into multiple parts in the circumferential direction of the spinning pack, and is characterized in that when the spinning pack is inserted into the recess, a heat conduction path is formed from the wall surface that defines the recess in the heating box to the outer surface of the spinning pack by members of the heat conduction mechanism, including at least the dividing member.

[0009] In the present invention, heat can be transferred from the heating box to the spinning pack via a heat transfer path formed by members of a heat transfer mechanism including at least the dividing member. Therefore, the efficiency of heat supply from the heating box to the spinning pack can be improved compared to when heat from the heating box is transferred to the spinning pack via an air layer. Furthermore, because the dividing member is divided into multiple parts in the circumferential direction of the spinning pack, uneven contact between the spinning pack and the dividing member is unlikely to occur. Therefore, uneven heat supply to the spinning pack in the circumferential direction can be suppressed.

[0010] In the melt spinning apparatus of the second invention, the dividing member is characterized in that it contacts the area of ​​the outer surface of the spinning pack inserted into the recess where the spinneret is located in the axial direction of the spinning pack.

[0011] In the present invention, the heat conduction mechanism can easily transfer heat from the heating box to the portion of the outer circumferential surface of the spin pack where the spinneret is located, thereby suppressing deterioration in yarn quality due to a low temperature of the spinneret.

[0012] In the melt spinning apparatus of the third invention, the heat conduction mechanism is located on the opposite side of the dividing member from the spinning pack, and further comprises a first inclined surface inclined so that one end in the vertical direction is located closer to the outer peripheral surface of the spinning pack than the other end, and the dividing member has a second inclined surface with the same inclination angle as the first inclined surface, and is arranged so that the second inclined surface is in contact with the first inclined surface and can move in the vertical direction.

[0013] In the present invention, the dividing member can move in the vertical direction with its second inclined surface in contact with the first inclined surface, thereby moving in the direction toward and away from the outer peripheral surface of the spinning pack, and therefore can be brought into contact with the outer peripheral surface of the spinning pack regardless of the size of the gap between the heating box and the spinning pack.

[0014] In the melt spinning apparatus of the fourth invention, the first inclined surface is inclined so that the upper end is located closer to the outer peripheral surface of the spinning pack than the lower end, and the dividing member is located below the first inclined surface.

[0015] In the present invention, by arranging the divided member below the first inclined surface, the heat conduction mechanism can be easily assembled.

[0016] In the melt spinning apparatus of the fifth invention, the dividing member is fixed to the first inclined surface by a bolt.

[0017] In the present invention, the dividing member can be fastened to the first inclined surface by bolts, which increases the contact pressure between the dividing member and the spinning pack, thereby further improving the efficiency of heat supply from the heating box to the spinning pack.

[0018] In the melt spinning device of the sixth aspect of the invention, the heat transfer mechanism further includes a biasing member that applies an upward biasing force to the dividing member.

[0019] In the present invention, the biasing member applies an upward biasing force to the divided member, so that the divided member can be reliably brought into contact with the outer peripheral surface of the spin pack.

[0020] In the melt spinning apparatus of the seventh invention, the first inclined surface is inclined so that the lower end is located closer to the outer peripheral surface of the spinning pack than the upper end, and the dividing member is located above the first inclined surface.

[0021] In the present invention, since the dividing member is located above the first inclined surface, the dividing member moves downward due to its own weight, and therefore the dividing member can be reliably brought into contact with the outer peripheral surface of the spin pack.

[0022] In the melt spinning apparatus of the eighth invention, the heat conduction mechanism is attached to a wall surface defining the recess in the heating box body, and is characterized in that it further comprises a fixing member having the first inclined surface, and a first insulating member covering the lower surface of the fixing member.

[0023] In the present invention, the first heat insulating member can suppress heat radiation from the lower surface of the fixing member that is exposed to the outside air, thereby further improving the efficiency of heat supply from the heating box to the spinning pack.

[0024] In the melt spinning apparatus of a ninth aspect of the present invention, the heat conduction mechanism further includes a second heat insulating member that covers a lower surface of the dividing member.

[0025] In the present invention, the second heat insulating member can suppress heat radiation from the lower surface of the divided member that is exposed to the outside air, thereby further improving the efficiency of heat supply from the heating box to the spinning pack. [Brief explanation of the drawings]

[0026] [Figure 1] 1 is a cross-sectional view of a melt spinning apparatus according to a first embodiment of the present invention. [Figure 2] 2A and 2B are enlarged views of the vicinity of the lower end of the recess in the heating box of the melt spinning apparatus shown in FIG. 1, where (a) shows a state in which the bolts are loosened, and (b) shows a state in which the bolts are tightened. [Figure 3] 2 is a partially enlarged perspective view of the melt spinning apparatus shown in FIG. 1 as seen from below, showing a state in which the dividing members are disassembled. FIG. [Figure 4] 4 is a graph showing the temperature change of the spinneret in the melt spinning apparatus of the first embodiment and a comparative example. [Figure 5] 10A and 10B are cross-sectional views of the vicinity of the lower end of a recess in a heating box of a melt spinning device according to a second embodiment of the present invention, in which (a) shows the state when a spinning pack is not inserted in the recess, (b) shows the state when a spinning pack is inserted in the recess, and (c) shows the state when the spinning pack is removed from the recess. [Figure 6]FIG. 10 is a cross-sectional view of the vicinity of the lower end of a recess in a heating box of a melt spinning apparatus according to a third embodiment of the present invention. [Figure 7] FIG. 10 is a cross-sectional view of the vicinity of the lower end of a recess in a heating box of a melt spinning apparatus according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0027] First Embodiment First, the overall configuration of a melt spinning apparatus 1 according to a first embodiment of the present invention will be described with reference to Fig. 1. The melt spinning apparatus 1 mainly comprises a cylindrical spinning pack 2 having a spinneret 21, a heating box 3 having a recess 32 opening downward, a heat conduction mechanism 4, and a cooling box 6.

[0028] A pack mounting section 31, to which the spin pack 2 is removably mounted, is provided within the recess 32 of the heating box 3. The spin pack 2 mounted in the pack mounting section 31 is inserted into the internal space of the recess 32 with its axial direction aligned vertically. The recess 32 is circular in plan view. A plurality of recesses 32 are provided in a staggered pattern along a direction perpendicular to the plane of FIG. 1. A recess 32a is formed at the lower end of the wall defining the recess 32. In this specification, the wall defining the recess 32 is defined as a part of the wall defining the recess 32. A part of the heat conduction mechanism 4 is disposed in this recess 32a. The gap between the wall defining the recess 32, excluding the portion where the recess 32a is formed, and the outer peripheral surface of the spin pack 2 inserted into the recess 32 is approximately 1 mm.

[0029] Inside the heating box 3, there are provided a plurality of polymer flow paths 33 extending from a spinning pump (not shown) to spinning packs 2 attached to pack attachment parts 31 provided in the plurality of recesses 32. The pack attachment parts 31 are fixed to the bottom surfaces of the recesses 32 by screws (not shown). The pack attachment parts 31 protrude downward and have connecting parts 31a with male threads formed on their outer circumferential surfaces. The pack attachment parts 31 are formed with through holes 31b which are the terminal ends of the polymer flow paths 33.

[0030] Heat transfer medium steam supplied from a heat transfer medium boiler (not shown) is sealed in the internal space 3a of the heating box 3. The outer surface of the heating box 3 is covered with a heat insulating member 5 such as ceramic felt.

[0031] The spin pack 2 has a pack member 23 in which an internal space 2a that communicates with a polymer flow path 33 is formed when the spin pack 2 is attached to the pack attachment part 31. A filter member 22 is disposed in the internal space 2a of the pack member 23. The pack member 23 is recessed from its upper surface, and has an internal thread formed on its inner circumferential surface that corresponds to the external thread of the connection part 31a of the pack attachment part 31, forming a threaded part 23a that can be threaded with the connection part 31a. The pack member 23 also has an opening 23b at its lower end that opens in the thickness direction and connects the internal space 2a to the external space. The spinneret 21 is fitted into this opening 23b.

[0032] The cooling box 6 is disposed below the heating box 3. A packing 7 is disposed on the upper surface of the cooling box 6. The cooling box 6 can be moved up and down by a drive mechanism (not shown), and can be in a state where it abuts against the lower surface of the heating box 3 via the packing 7 (the state in FIG. 1 ), or in a state where it is separated from the lower surface of the heating box 3.

[0033] An opening 71 is formed in the packing 7 at a portion facing the recessed portion 32 of the heating box 3. Furthermore, openings 61 and 62 are formed in the upper and lower walls of the cooling box 6 at portions facing the recessed portion 32 of the heating box 3, respectively. The portion of the cooling box 6 facing the recessed portion 32 of the heating box 3 forms a yarn running space 6a through which the molten polymer spun from the spinneret 21 passes. Within the cooling box 6, the yarn running space 6a is separated from the other portions by a filter 63. Cooling air is pressure-fed to the cooling box 6 through a duct (not shown). The cooling air pressure-fed into the cooling box 6 is pressure-fed to the yarn running space 6a via the filter 63.

[0034] In the melt spinning apparatus 1 configured as described above, heat transfer medium vapor is supplied from a heat transfer medium boiler (not shown) to the internal space 3a of the heating box 3. The heat transfer medium vapor supplied to the internal space 3a of the heating box 3 heats the heating box 3 to a predetermined spinning temperature that is equal to or higher than the melting point of the polymer. Thereafter, multiple spinning packs 2 preheated to a temperature equivalent to the spinning temperature using a heater (not shown) or the like are inserted into each recess 32 of the heating box 3 and attached to the pack attachment section 31. Heat from the heating box 3 is transferred to the spinning packs 2 attached to the pack attachment section 31 by a heat conduction mechanism 4.

[0035] Then, a high-temperature molten polymer such as nylon or polyester delivered from a spinning pump (not shown) is sent into the internal space 2a of the spinning pack 2 via the polymer flow path 33. The molten polymer delivered into the internal space 2a of the spinning pack 2 is filtered by a filtering member 22 and then spun out from the spinneret 21. The molten polymer spun out from the spinneret 21 passes through the yarn traveling space 6a in the cooling box 6. At this time, the molten polymer traveling in the yarn traveling space 6a is cooled by cooling air pressure-fed into the yarn traveling space 6a.

[0036] Next, the configuration of the heat conduction mechanism 4 will be described with further reference to Figures 2(a), (b), and 3. The heat conduction mechanism 4 is disposed in the gap between the wall surface defining the recess 32 formed in the heating box 3 and the spinning pack 2 inserted into the recess 32. The heat conduction mechanism 4 mainly includes a fixing member 41, a dividing member 42 consisting of four moving blocks 43, and heat insulating members 46a and 46b. The fixing member 41 and the dividing member 42 are preferably made of a material with high thermal conductivity, such as aluminum alloy, copper alloy, ordinary steel, alloy steel, special steel, carbon fiber composite, silicone rubber, etc. The fixing member 41 and the dividing member 42 may be made of a material with a thermal conductivity at least higher than that of a non-flowing air layer.

[0037] The fixing member 41 is in contact with the wall surface that defines the recess 32 of the heating box 3. The fixing member 41 is attached to the wall surface that defines the recess 32 of the heating box 3 with bolts (not shown) or the like. The fixing member 41 is located on the opposite side of the dividing member 42 from the spin pack 2. The fixing member 41 is disposed in a recess 32a formed in the lower end of the wall surface that defines the recess 32 of the heating box 3. The fixing member 41 is disposed so as to surround the periphery of the spin pack 2 inserted into the recess 32.

[0038] 2(a) and 2(b), the fixing member 41 has a first inclined surface 41a that is inclined so that its upper end is closer to the outer peripheral surface of the spin pack 2 than its lower end. The first inclined surface 41a faces the spin pack 2 in the gap between the wall surface that defines the recess 32 formed in the heating box 3 and the outer peripheral surface of the spin pack 2 inserted into the recess 32. As shown in FIG. 3, the first inclined surfaces 41a are flat, and four of them are arranged to surround the periphery of the spin pack 2 inserted into the recess 32.

[0039] The fixed member 41 has four screw holes 41b formed therein that correspond to elongated holes 43c (described in detail later) formed in each of the four moving blocks 43 that make up the divided member 42. The screw holes 41b extend in the vertical direction and penetrate the fixed member 41. The lower ends of the screw holes 41b open to the first inclined surface 41a. The lower surface of the fixed member 41 is covered with a heat insulating member 46a such as ceramic felt.

[0040] The dividing member 42 is located between the fixed member 41 and the spin pack 2, below the first inclined surface 41a of the fixed member 41. As shown in Fig. 3, the dividing member 42 is composed of four moving blocks 43 arranged along the circumferential direction of the spin pack 2 inserted into the recess 32. That is, the dividing member 42 is divided into four parts with respect to the circumferential direction of the spin pack 2 inserted into the recess 32. The lower surface of the moving blocks 43 is covered with a heat insulating member 46b such as ceramic felt.

[0041] Each moving block 43 has a second inclined surface 43a corresponding to one of the four first inclined surfaces 41a of the fixed member 41. The second inclined surface 43a has the same inclination angle as the corresponding first inclined surface 41a. The second inclined surface 43a faces the wall surface defining the recess 32 in the gap between the wall surface defining the recess 32 formed in the heating box 3 and the outer peripheral surface of the spinning pack 2 inserted into the recess 32.

[0042] The moving block 43 has a contact surface 43b that has approximately the same curvature as the curvature of the outer peripheral surface of the spin pack 2 and can come into contact with the outer peripheral surface of the spin pack 2 inserted into the recess 32. The contact surface 43b faces the spin pack 2 in the gap between the wall surface that defines the recess 32 formed in the heating box 3 and the outer peripheral surface of the spin pack 2 inserted into the recess 32.

[0043] As shown in Figures 2(a) and 2(b), the moving block 43 has an elongated hole 43c that penetrates the moving block 43 in the up-down direction. The elongated hole 43c opens to the second inclined surface 43a. As shown in Figure 3, the elongated hole 43c has an elliptical shape that is elongated in a direction perpendicular to the outer circumferential surface of the spinning pack 2. The moving block 43 can be fixed to the fixing member 41 by threading the tip of a bolt 45 inserted into the elongated hole 43c from below into a screw hole 41b formed in the fixing member 41.

[0044] 2(a), when the bolt 45 is loosened, the moving block 43 is movable up and down with the second inclined surface 43a in contact with the first inclined surface 41a of the fixing member 41. The moving block 43 moves upward with the second inclined surface 43a in contact with the first inclined surface 41a, thereby moving in a direction approaching the spinning pack 2 (moving away from the heating box 3). The moving block 43 also moves downward with the second inclined surface 43a in contact with the first inclined surface 41a, or moves downward with the second inclined surface 43a moving away from the first inclined surface 41a, thereby moving in a direction away from the spinning pack 2 (moving towards the heating box 3).

[0045] As shown in FIG. 2(b), the moving blocks 43 are moved upward by tightening the bolts 45, and the contact surfaces 43b of the moving blocks 43 come into contact with the outer peripheral surface of the spin pack 2 inserted in the recess 32. When at least one moving block 43 comes into contact with the outer peripheral surface of the spin pack 2 as shown in FIG. 2(b), the contact surface 43b of the at least one moving block 43 comes into contact with the outer peripheral surface of the spin pack 2 in the circumferential direction of the spin pack 2. That is, when four moving blocks 43 come into contact with the outer peripheral surface of the spin pack 2, the dividing member 42 (four moving blocks 43) comes into contact with the outer peripheral surface of the spin pack 2 in the circumferential direction of the spin pack 2. When four moving blocks 43 come into contact with the outer peripheral surface of the spin pack 2, there is almost no gap between adjacent moving blocks 43. Therefore, the dividing member 42 (four moving blocks 43) surrounds the spin pack 2 over almost the entire circumferential direction of the spin pack 2. The contact surface 43b of the moving block 43 contacts a range A (see FIG. 2(b)) of the outer circumferential surface of the spinning pack 2 inserted into the recess 32, where the spinneret 21 is located in the axial direction (vertical direction) of the spinning pack 2. In this embodiment, the entire contact surface 43b is located within the range A.

[0046] When the contact surface 43b of the moving block 43 comes into contact with the outer peripheral surface of the spin pack 2, the fixed member 41 and the moving block 43 form a heat conduction path from the wall surface defining the recess 32 in the heating box 3 to the outer peripheral surface of the spin pack 2. As a result, heat from the heating box 3 is first conducted to the fixed member 41, which is in contact with the heating box 3. Then, the heat conducted to the fixed member 41 is conducted to the moving block 43, which is in contact with the fixed member 41. Finally, the heat conducted to the moving block 43 is conducted to the spin pack 2, which is in contact with the moving block 43.

[0047] When attaching or detaching the spinning pack 2 to or from the pack mounting part 31, the bolt 45 is loosened to make the moving block 43 movable. At this time, the moving block 43 moves downward due to gravity, moving in a direction approaching the heating box 3 (a direction away from the spinning pack 2 inserted in the recess 32). This makes the spinning pack 2 detachable from or attachable to the pack mounting part 31 (the state shown in FIG. 2(a)). After the spinning pack 2 is attached to the pack mounting part 31, the bolt 45 is tightened to make the contact surface 43b of the moving block 43 contact the outer peripheral surface of the spinning pack 2 (the state shown in FIG. 2(b)).

[0048] In the melt spinning apparatus 1, it is necessary to periodically perform a so-called surface cleaning operation to remove foreign matter adhering to the surface of the spinneret 21. The molten polymer spun from the spinneret 21 during the surface cleaning operation is discarded. Therefore, to prevent the molten polymer from being wasted, the surface cleaning operation is sometimes performed with the spinning of the molten polymer from the spinneret 21 stopped. During the surface cleaning operation, the cooling box 6 is moved downward, from a state in which the cooling box 6 abuts against the bottom surface of the heating box 3 via the packing 7, to a state in which the cooling box 6 is separated from the bottom surface of the heating box 3. After the surface cleaning operation, the cooling box 6 is moved upward, from a state in which the cooling box 6 is separated from the bottom surface of the heating box 3, to a state in which the cooling box 6 abuts against the bottom surface of the heating box 3 via the packing 7. The spin pack 2 is heated to a predetermined temperature before being attached to the heating box 3, but the spinneret 21 is exposed to the outside air until the cooling box 6 comes into contact with the underside of the heating box 3, causing the temperature of the spinneret 21 to drop. If the temperature of the spinneret 21 drops, the quality of the spun yarn will decrease when spinning of molten polymer from the spinneret 21 is resumed after the surface cleaning operation. Therefore, it is desirable to quickly increase the temperature of the spinneret 21 after the surface cleaning operation.

[0049] The temperature change of the spinneret 21 in the melt spinning apparatus of the example and comparative example is shown in the graph of Figure 4. Specifically, the graph of Figure 4 shows the temperature change of the spinneret 21 after the spinning pack 2 is attached to the heating box 3.

[0050] In the example, the material of the fixing member 41 and the dividing member 42 in the melt spinning apparatus 1 of the first embodiment described above is ordinary steel. The melt spinning apparatus of the comparative example has the same configuration as the melt spinning apparatus 1 of the above embodiment, except that it does not include the heat conduction mechanism 4 and that the recess 32 of the heating box 3 does not have a depression 32a. In the melt spinning apparatus of the comparative example, the gap between the wall surface defining the recess 32 and the outer peripheral surface of the spinning pack 2 inserted into the recess 32 is approximately 1.0 mm. In the melt spinning apparatus of the comparative example, heat is supplied from the heating box 3 to the spinning pack 2 through the air layer present in this gap of approximately 1.0 mm.

[0051] 4, the vertical axis indicates the temperature (°C) of the spinneret 21, and the horizontal axis indicates the time (min) elapsed since the spin pack 2 was attached to the heating box 3. The thick solid line indicates the temperature measured at the center of the underside of the spinneret 21 of the example, and the thick dashed line indicates the temperature measured at the center of the underside of the spinneret 21 of the comparative example. The thin solid line indicates the average temperature measured at the side of the spinneret 21 of the example, and the thin dashed line indicates the average temperature measured at the side of the spinneret 21 of the comparative example.

[0052] 4, the temperature of the center of the underside of the spinneret 21 of the Example decreases more slowly after the spin pack 2 is attached to the heating box 3 than the spinneret 21 of the Comparative Example. Furthermore, after about 3 minutes have passed since the start of measurement and the cooling box 6 is brought into contact with the underside of the heating box 3 via the packing 7, the temperature of the center of the underside of the spinneret 21 of the Example increases quickly, while the temperature of the center of the underside of the spinneret 21 of the Comparative Example increases slowly. Regarding the temperature of the side of the spinneret 21, the temperature of the spinneret 21 of the Example changes less after the spin pack 2 is attached to the heating box 3 than the spinneret 21 of the Comparative Example, and the temperature hardly decreases at all.

[0053] (Effects of the first embodiment) As described above, the melt spinning apparatus 1 of this embodiment includes the cylindrical spinning pack 2 having the spinneret 21, the heating box 3 having the recess 32 that opens downward and into which the spinning pack 2 is inserted, and the heat conduction mechanism 4 that is capable of contacting the outer circumferential surface of the spinning pack 2 inserted into the recess 32 and that has a dividing member 42 that is divided into four moving blocks 43 in the circumferential direction of the spinning pack 2. When the spinning pack 2 is inserted into the recess 32, a heat conduction path is formed from the wall surface that defines the recess 32 in the heating box 3 to the outer circumferential surface of the spinning pack 2 by the members of the heat conduction mechanism 4, including the dividing member 42.

[0054] Therefore, heat from the heating box 3 can be transferred to the spinning pack 2 via a heat transfer path formed by the members of the heat transfer mechanism 4, including the dividing member 42. This improves the efficiency of heat supply from the heating box 3 to the spinning pack 2 compared to when heat from the heating box 3 is transferred to the spinning pack 2 via an air layer. Furthermore, since the dividing member 42 is divided into multiple parts in the circumferential direction of the spinning pack 2, uneven contact between the spinning pack 2 and the dividing member 42 is unlikely to occur. This prevents heat from being supplied to the spinning pack 2 unevenly in the circumferential direction.

[0055] In the melt spinning apparatus 1 of this embodiment, the dividing member 42 (moving block 43) contacts a range A on the outer circumferential surface of the spinning pack 2 inserted into the recess 32, where the spinneret 21 is located in the axial direction (vertical direction) of the spinning pack 2. Therefore, the heat from the heating box 3 can be easily transferred by the heat conduction mechanism 4 to the portion of the outer circumferential surface of the spinning pack 2 where the spinneret 21 is located. Therefore, a deterioration in yarn quality due to a low temperature of the spinneret 21 can be suppressed.

[0056] In the melt spinning apparatus 1 of this embodiment, the heat conduction mechanism 4 is located on the opposite side of the dividing member 42 from the spin pack 2, and further includes a first inclined surface 41a that is inclined so that its upper end is closer to the outer circumferential surface of the spin pack 2 than its lower end. The dividing member 42 (moving block 43) has a second inclined surface 43a with the same inclination angle as the first inclined surface 41a, and is disposed so as to be movable up and down with the second inclined surface 43a in contact with the first inclined surface 41a. Therefore, the dividing member 42 (moving block 43) can move toward and away from the outer circumferential surface of the spin pack 2 by moving up and down with its second inclined surface 43a in contact with the first inclined surface 41a. Therefore, the dividing member 42 (moving block 43) can be brought into contact with the outer circumferential surface of the spin pack 2 regardless of the size of the gap between the heating box 3 and the spin pack 2.

[0057] In the melt spinning apparatus 1 of this embodiment, the dividing member 42 (moving block 43) is located below the first inclined surface 41a. Therefore, by disposing the dividing member 42 (moving block 43) below the first inclined surface 41a, the heat conduction mechanism 4 can be easily assembled.

[0058] In the melt spinning apparatus 1 of this embodiment, the heat conduction mechanism 4 is attached to a wall surface that defines the recess 32 in the heating box 3 and further includes a fixing member 41 having a first inclined surface 41a, and the dividing member 42 (moving block 43) is fixed to the fixing member 41 (first inclined surface 41a) with a bolt 45. Therefore, the dividing member 42 (moving block 43) and the fixing member 41 can be fastened and fixed with the bolt 45, which can increase the contact pressure between the dividing member 42 (moving block 43) and the spinning pack 2. This can further improve the efficiency of heat supply from the heating box 3 to the spinning pack 2.

[0059] In the melt spinning apparatus 1 of this embodiment, the lower surface of the fixing member 41 is covered with the heat insulating member 46a. Therefore, the heat insulating member 46a can suppress heat radiation from the lower surface of the fixing member 41 that is exposed to the outside air. This can further improve the efficiency of heat supply from the heating box 3 to the spinning pack 2.

[0060] In the melt spinning apparatus 1 of this embodiment, the lower surface of the dividing member 42 (moving block 43) is covered with the heat insulating member 46b. Therefore, the heat insulating member 46b can suppress heat radiation from the lower surface of the dividing member 42 (moving block 43) that is exposed to the outside air. This can further improve the efficiency of heat supply from the heating box 3 to the spinning pack 2.

[0061] Second Embodiment Next, a melt spinning apparatus 101 according to a second embodiment of the present invention will be described with reference to Fig. 5. The configuration of the melt spinning apparatus 101 of this embodiment is the same as the configuration of the melt spinning apparatus 1 of the first embodiment, except for the heat conduction mechanism 104. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.

[0062] The heat conduction mechanism 104 of the present embodiment differs mainly from the heat conduction mechanism 4 of the first embodiment in the positional relationship between the fixed member 141 and the dividing member 142. That is, in the heat conduction mechanism 4 of the first embodiment, the dividing member 42 is located below the first inclined surface 41a of the fixed member 41, but in the heat conduction mechanism 104 of the present embodiment, the dividing member 142 is located above the first inclined surface 141a of the fixed member 141.

[0063] The first inclined surface 141a of the fixing member 141 is inclined so that the lower end is located closer to the outer circumferential surface of the spinning pack 2 than the upper end. The lower surface of the fixing member 141 is covered with a heat insulating member 146a such as ceramic felt.

[0064] The fixing member 141 has four first screw holes 141b and four second screw holes 141c. The first screw holes 141b and the second screw holes 141c extend in the up-down direction and penetrate the fixing member 141. The first screw holes 141b and the second screw holes 141c open to the first inclined surface 141a. The four first screw holes 141b and the four second screw holes 141c are provided corresponding to the four moving blocks 143 that constitute the dividing member 142, which will be described later. The first screw holes 141b are provided in a gap between the heating box 3 and the spinning pack 2 inserted in the recess 32, closer to the heating box 3 than the second screw holes 141c.

[0065] A bolt 145a is fitted into the first screw hole 141b from below. A bolt 145b is fitted into the second screw hole 141c from below. A boost member 145c for pushing up the moving block 143 is attached to the tip of the bolt 145b, as will be described in detail later. In this embodiment, the upper end surface of the boost member 145c is an inclined surface with the same inclination angle as the above-mentioned third inclined surface 143c of the moving block 143. The upper end surface of the boost member 145c may also be a horizontal surface.

[0066] The dividing member 142 is made up of four movable blocks 143 arranged along the circumferential direction of the spinning pack 2 inserted into the recess 32. Each movable block 143 has a second inclined surface 143a having the same inclination angle as the first inclined surface 141a of the fixed member 141. The movable block 143 is movable in the vertical direction with the second inclined surface 143a in contact with the first inclined surface 141a of the fixed member 141. A recess 143d that opens downward is formed in the second inclined surface 143a.

[0067] The moving block 143 has a contact surface 143b that can come into contact with the outer circumferential surface of the spinning pack 2 inserted into the recess 32. Furthermore, the moving block 143 has a third inclined surface 143c that is inclined so that its upper end is located closer to the outer circumferential surface of the spinning pack 2 than its lower end. The third inclined surface 143c faces diagonally downward and connects the second inclined surface 143a and the contact surface 143b. The third inclined surface 143c is covered with a heat insulating member 146b such as ceramic felt.

[0068] 5(a), when the spinning pack 2 is not inserted in the recess 32, the tip of the bolt 145a screwed into the first screw hole 141b is positioned in the recess 143d formed in the moving block 143. This prevents the moving block 143 from slipping down the first inclined surface 141a of the fixing member 141.

[0069] 5(b), after inserting the spinning pack 2 into the recess 32, the bolt 145a is loosened so that the tip of the bolt 145a is positioned in the first screw hole 141b, whereby the moving block 143 moves downward by its own weight. Then, the contact surface 143b of the moving block 143 comes into contact with the outer circumferential surface of the spinning pack 2 inserted into the recess 32. At this time, the fixing member 141 and the moving block 143 form a heat conduction path from the wall surface defining the recess 32 in the heating box 3 to the outer circumferential surface of the spinning pack 2.

[0070] As shown in Figure 5(c), when removing the spinning pack 2 from the recess 32, first, the bolt 145b is tightened. As a result, the upper end surface of the push-up member 145c attached to the bolt 145b comes into contact with the third inclined surface 143c of the moving block 143, and the moving block 143 is pushed up. Then, the contact surface 143b of the moving block 143 is separated from the outer peripheral surface of the spinning pack 2 inserted in the recess 32. Thereafter, the bolt 145a is tightened so that the tip of the bolt 145a is positioned within the recess 143d of the moving block 143, as shown in Figure 5(a), and the spinning pack 2 is removed from the recess 32.

[0071] (Effects of the second embodiment) According to this embodiment, in addition to the effects based on the same configuration as in the first embodiment, the following effect can be obtained. In the melt spinning apparatus 101 of this embodiment, the first inclined surface 141a is inclined so that the lower end is located closer to the outer peripheral surface of the spinning pack 2 than the upper end, and the dividing member 142 (moving block 143) is located above the first inclined surface 141a. Therefore, the dividing member 142 (moving block 143) moves downward by its own weight and reliably comes into contact with the outer peripheral surface of the spinning pack 2.

[0072] <Third embodiment> Next, a melt spinning apparatus 201 according to a third embodiment of the present invention will be described with reference to Fig. 6. The configuration of the melt spinning apparatus 201 of this embodiment is substantially the same as the configuration of the melt spinning apparatus 1 of the first embodiment, except for the heat conduction mechanism 204. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.

[0073] The main difference between the heat conduction mechanism 204 of the present embodiment and the heat conduction mechanism 4 of the first embodiment is the structure for pushing up the moving block 243 (divided member 242). That is, in the heat conduction mechanism 4 of the first embodiment, the moving block 43 (divided member 42) is moved upward by tightening the bolts 45, but in the heat conduction mechanism 204 of the present embodiment, the moving block 243 (divided member 242) is pushed up and moved upward by the fitting member 248.

[0074] Similar to the heat conduction mechanism 4 of the first embodiment, the heat conduction mechanism 204 includes a fixed member 241 whose lower surface is covered with a heat insulating member 246a, and a divided member 242 whose lower surface is covered with a heat insulating member 246b and which is divided into four moving blocks 243. In addition, the heat conduction mechanism 204 includes springs 247 attached to the lower surface of each moving block 243, and disk-shaped fitting members 248 fitted into the lower ends of the recesses 32.

[0075] By fitting the fitting member 248 into the lower end of the recess 32, the moving block 243 is pushed up via the spring 247 attached to the lower surface of the moving block 243. Then, the moving block 243 moves upward with its second inclined surface 243a in contact with the first inclined surface 241a of the fixed member 241, and the contact surface 243b comes into contact with the outer peripheral surface of the spinning pack 2.

[0076] A male thread 248a is formed on the outer peripheral surface of the fitting member 248. A female thread 232b is formed on the lower end of the wall defining the recess 32. The fitting member 248 can be fitted into the lower end of the recess 32 by engaging the male thread 248a of the fitting member 248 with the female thread 232b on the wall defining the recess 32. A circular opening 248b is formed in the center of the fitting member 248 to expose the spinneret 21 to the outside. The diameter D2 of the opening 248b is larger than the diameter D1 of the spin pack 2. Therefore, by loosening the fitting of the fitting member 248, the spin pack 2 can be attached or detached without removing the fitting member 248 from the lower end of the recess 32. The fitting member 248 is made of a material with high thermal conductivity, such as an aluminum alloy, a copper alloy, ordinary steel, an alloy steel, a special steel, a carbon fiber composite, or silicone rubber. The lower surface of the fitting member 248 is covered with a heat insulating member 246c such as ceramic felt.

[0077] (Effects of the third embodiment) According to this embodiment, in addition to the effects based on the same configuration as in the first embodiment, the following effect can be obtained. In the melt spinning apparatus 201 of this embodiment, when the fitting member 248 is fitted into the lower end of the recess 32, an upward biasing force is applied to the moving block 243 by the spring 247. Therefore, the moving block 243 (divided member 242) can be reliably brought into contact with the outer peripheral surface of the spinning pack 2.

[0078] <Fourth embodiment> Next, a melt spinning apparatus 301 according to a fourth embodiment of the present invention will be described with reference to Fig. 7. The configuration of the melt spinning apparatus 301 of this embodiment is substantially the same as the configuration of the melt spinning apparatus 1 of the first embodiment, except for the heat conduction mechanism 304. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and description thereof will be omitted.

[0079] The heat conduction mechanism 304 of this embodiment differs from the heat conduction mechanism 4 of the first embodiment mainly in the structure for moving the movable block 343 (divided member 342). That is, in the heat conduction mechanism 4 of the first embodiment, the movable block 43 is moved up and down while the second inclined surface 43a of the movable block 43 is in contact with the first inclined surface 41a of the fixed member 41, thereby moving the movable block 43 in a direction approaching the spinning pack 2 and a direction away from the spinning pack 2. On the other hand, in the heat conduction mechanism 304 of this embodiment, the movable block 343 (divided member 342) is supported by a spring 341, which is a compression coil spring that expands and contracts in a direction approaching the spinning pack 2 and a direction away from the spinning pack 2.

[0080] The springs 341 are provided corresponding to the respective moving blocks 343 of the dividing member 342. The material of the springs 341 and the dividing member 342 is preferably a material with high thermal conductivity, such as aluminum alloy, copper alloy, ordinary steel, alloy steel, special steel, carbon fiber composite, silicone rubber, etc. The material of the springs 341 and the dividing member 342 may be any material as long as it has a thermal conductivity at least higher than that of the non-flowing air layer.

[0081] One end of the spring 341 is attached to the surface of the moving block 343 that faces the heating box 3. The spring 341 is detachably attached to the heating box 3 so that the other end opposite to the side attached to the moving block 343 comes into contact with a wall surface that defines the recess 32 in the heating box 3.

[0082] The spring 341 is disposed in a recess 332a formed at the lower end of the wall surface defining the recess 32 of the heating box 3. The contact surface 343b of the moving block 343 is located outside the recess 332a. When no external force is applied to the moving block 343, the length of the heat conduction mechanism 304 in the thickness direction of the gap is greater than the size of the gap G (see FIG. 7(b)) between the wall surface defining the recess 32 in the recess 332a and the outer peripheral surface of the spinning pack 2. The wall surface defining the recess 332a is composed of a bottom surface facing the outer peripheral surface of the spinning pack 2 inserted into the recess 32 and side surfaces located at both ends of the bottom surface in the up-down direction. The upper and lower surfaces of the moving block 343 are in contact with both side surfaces of the recess 332a. That is, the vertical length of the moving block 343 is approximately equal to the vertical length of the recess 332a.

[0083] An inclined surface 343a is formed on the moving block 343. The inclined surface 343a is formed on the lower surface of the portion of the moving block 343 opposite to the side where the spring 341 is attached in the thickness direction of the gap (the left-right direction in FIGS. 7(a) and 7(b)). The inclined surface 343a is inclined so that the lower end is located closer to the heating box 3 than the upper end in the thickness direction of the gap. The inclined surface 343a is covered with a heat insulating member 346b.

[0084] 7(a), when the spinning pack 2 is inserted into the recess 32 from below, the upper end of the spinning pack 2 comes into contact with the inclined surface 343a of the moving block 343. When the upper end of the spinning pack 2 comes into contact with the inclined surface 343a of the moving block 343, the spinning pack 2 is pushed up, causing the moving block 343 to move in a direction approaching the heating box 3, and the spring 341 contracts.

[0085] As shown in Figure 7(b), when the spin pack 2 is completely inserted into the recess 32, the contact surface 343b of the moving block 343 comes into contact with the outer circumferential surface of the spin pack 2. More specifically, the contact surface 343b of the moving block 343 comes into contact with the area of ​​the outer circumferential surface of the spin pack 2 inserted into the recess 32 where the spinneret 21 is located in the vertical direction. The spring 341 compresses according to the size of the gap between the wall surface defining the recess 32 and the outer circumferential surface of the spin pack 2. The spring 341 applies a biasing force to the moving block 343 in the direction toward the outer circumferential surface of the spin pack 2.

[0086] When the contact surface 343b of the moving block 343 comes into contact with the outer circumferential surface of the spin pack 2, the spring 341 and the moving block 343 form a heat conduction path from the wall surface defining the recess 32 in the heating box 3 to the outer circumferential surface of the spin pack 2. As a result, heat from the heating box 3 is conducted to the moving block 343 from both side surfaces of the recess 332a that contact the upper and lower surfaces of the moving block 343. Heat from the heating box 3 is also conducted to the moving block 343 via the spring 341. Finally, the heat conducted to the moving block 343 is conducted to the spin pack 2 that is in contact with the moving block 343.

[0087] (Effects of the third embodiment) According to this embodiment, in addition to the effects based on the same configuration as in the first embodiment, the following effects can be obtained: In the melt spinning apparatus 301 of this embodiment, the spring 341 applies a biasing force to the moving block 343 in a direction toward the outer peripheral surface of the spinning pack 2, so that the dividing member 342 (moving block 343) can be reliably brought into contact with the spinning pack 2.

[0088] (Variation) Although the embodiments of the present invention have been described above with reference to the drawings, the specific configurations should not be considered to be limited to these embodiments. The scope of the present invention is defined by the claims rather than the above description of the embodiments, and further includes all modifications within the meaning and scope of the claims.

[0089] In the above embodiment, the dividing member 42 (142, 242, 342) is divided into four parts in the circumferential direction of the spinning pack 2, but this is not limiting. The dividing member 42 (142, 242, 342) may be divided into two or more parts.

[0090] In the above embodiment, the entire contact surface 43b (143b, 243b, 343b) of the dividing member 42 (142, 242, 342) is in contact with the area A on the outer circumferential surface of the spin pack 2 where the spinneret 21 is located in the axial direction (vertical direction) of the spin pack 2. However, this is not limited to this. A part of the contact surface 43b (143b, 243b, 343b) of the dividing member 42 (142, 242, 342) may be in contact with the area A, or the entire dividing member 42 (142, 242, 342) may be in contact with a part outside the area A.

[0091] Furthermore, in the above embodiment, the fixing member 41 (141, 241) having the first inclined surface 41a (141a, 241a) is attached to the wall surface that defines the recess 32 in the heating box 3, but this is not limited to this. The first inclined surface 41a (141a, 241a) may be formed on the heating box 3.

[0092] Additionally, in the above-described embodiment, the lower surface of the fixing member 41 (141, 241) is covered with the heat insulating member 46a (146a, 246a). Also, the lower surface of the dividing member 42 (142, 242, 342) is covered with the heat insulating member 46b (146b, 246b, 346b). However, these heat insulating members 46a (146a, 246a) and 46b (146b, 246b, 346b) may be omitted. Also, only one of the heat insulating member 46a (146a, 246a) and the heat insulating member 46b (146b, 246b, 346b) may be provided.

[0093] In the second embodiment described above, the moving block 143 is pushed up by the push-up member 145c attached to the bolt 145b when the spinning pack 2 is removed from the recess 32, but the present invention is not limited to this. That is, the pushing-up member 145c may not be provided, and the moving block 143 may be pushed up by the tip of the bolt 145b.

[0094] In the above-described third embodiment, the case where the male thread 248a is formed on the outer peripheral surface of the fitting member 248 and the female thread 232b that meshes with the male thread 248a is formed on the lower end of the wall surface that defines the recess 32 has been described, but the present invention is not limited to this. That is, for example, a male thread may be formed on the outer peripheral surface of the spin pack 2, and a female thread that meshes with the male thread may be formed on the inner peripheral surface of the fitting member 248.

[0095] In the fourth embodiment described above, the upper and lower surfaces of the movable block 343 are in contact with both side surfaces of the recess 332a, but this is not limiting. That is, the vertical length of the movable block 343 may be sufficiently smaller than the vertical length of the recess 332a, and the upper and lower surfaces of the movable block 343 may be spaced apart from both side surfaces of the recess 332a. In this case, it is preferable that not only the inclined surface 343a but also the lower surface of the movable block 343 be covered with a heat insulating member.

[0096] In the above embodiment, when the four moving blocks 43 (143, 243, 343) come into contact with the outer peripheral surface of the spinning pack 2, the dividing members 42 (142, 242, 342) surround the spinning pack 2 over almost the entire circumferential direction of the spinning pack 2. However, this is not limiting. That is, when the four moving blocks 43 (143, 243, 343) come into contact with the outer peripheral surface of the spinning pack 2, gaps may be formed between adjacent moving blocks 43 (143, 243, 343). Furthermore, the contact surfaces 43b (143b, 243b, 343b) of the four moving blocks 43 (143, 243, 343) do not all need to be in contact with the outer peripheral surface of the spinning pack 2. That is, it is sufficient that only a portion of the contact surfaces 43b (143b, 243b, 343b) come into contact with the outer peripheral surface of the spinning pack 2. [Explanation of symbols]

[0097] 1, 101, 201, 301 Melt spinning equipment 2 spinning packs 3 Heating box 4, 104, 204, 304 Heat conduction mechanism 21 Spinneret 32 recess 41, 141, 241 Fixing member 41a, 141a, 241a 1st slope 42, 142, 242, 342 Divided parts 43a, 143a, 243a 2nd slope 45 volts 46a, 146a, 246a: Heat insulating member (first heat insulating member) 46b, 146b, 246b, 346b Heat insulating member (second heat insulating member) 247 Springs (biasing members)

Claims

1. a cylindrical spin pack having a spinneret; a heating box having an inner space having a recessed portion that opens downward and into which the spinning pack is inserted; a heat conduction mechanism that is capable of contacting an outer peripheral surface of the spinning pack inserted into the recess and has a divided member that is divided into a plurality of parts in the circumferential direction of the spinning pack, when the spinning pack is inserted into the recess, a heat conduction path is formed from a wall surface defining the recess in the heating box to an outer peripheral surface of the spinning pack by members of the heat conduction mechanism including at least the dividing member, the heat conduction mechanism further includes a first inclined surface formed on a member separate from the dividing member, the first inclined surface is inclined so that one end in the vertical direction is located closer to the outer peripheral surface of the spin pack than the other end, and is located on the opposite side of the dividing member from the spin pack, The dividing member has a second inclined surface having the same inclination angle as the first inclined surface, and is arranged so as to be movable in the vertical direction with the second inclined surface in contact with the first inclined surface.

2. 2. The melt spinning apparatus according to claim 1, wherein the dividing member contacts a region of the outer circumferential surface of the spin pack inserted into the recess, the region corresponding to the spinneret in the axial direction of the spin pack.

3. the first inclined surface is inclined so that an upper end thereof is located closer to an outer peripheral surface of the spin pack than a lower end thereof, 3. The melt spinning apparatus according to claim 1, wherein the dividing member is located below the first inclined surface.

4. 4. The melt spinning apparatus according to claim 3, wherein the dividing member is fixed to the first inclined surface by a bolt.

5. 4. The melt spinning apparatus according to claim 3, wherein the heat transfer mechanism further comprises a biasing member that applies an upward biasing force to the dividing member.

6. the first inclined surface is inclined so that a lower end thereof is located closer to an outer peripheral surface of the spinning pack than an upper end thereof, 3. The melt spinning apparatus according to claim 1, wherein the dividing member is located above the first inclined surface.

7. The heat conduction mechanism is a fixing member attached to a wall surface that defines the recess in the heating box and having the first inclined surface; a first heat insulating member covering a lower surface of the fixing member; The melt spinning apparatus according to any one of claims 1 to 6, further comprising:

8. 8. The melt spinning apparatus according to claim 1, wherein the heat transfer mechanism further comprises a second heat insulating member covering a lower surface of the dividing member.

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