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EP-4033015-B1 - MELT SPINNING DEVICE

EP4033015B1EP 4033015 B1EP4033015 B1EP 4033015B1EP-4033015-B1

Inventors

  • KOJIMA, Shogo

Dates

Publication Date
20260506
Application Date
20211214

Claims (7)

  1. A melt spinning device (1, 101, 201, 301) comprising: a cylindrical spinning pack (2) including a spinneret (21) ; a heated box (3) including a concave portion (32) having an internal space into which the spinning pack (2) is inserted, the concave portion (32) being open downward; and a heat conduction mechanism (4, 104, 204, 304) including a separated member (42, 142, 242, 342) which is able to make contact with an outer circumferential surface of the spinning pack (2) inserted into the concave portion (32), the separated member (42, 142, 242, 342) being separated into plural members with respect to a circumferential direction of the spinning pack (2), the heat conduction mechanism (4, 104, 204, 304) further including one or more members which include at least the separated member (42, 142, 242, 342), and the one or more members forming a heat conduction path from a wall surface defining the concave portion (32) in the heated box (3) to the outer circumferential surface of the spinning pack (2) when the spinning pack (2) is inserted into the concave portion (32), wherein the heat conduction mechanism (4, 104, 204) further includes a first inclined surface (41a, 141a, 241a) provided to oppose the spinning pack (2) over the separated member (42, 142, 242), the first inclined surface (41a, 141a, 241a) being inclined so that one end of the first inclined surface (41a, 141a, 241a) in an up-down direction is close to the outer circumferential surface of the spinning pack (2) as compared to the other end of the first inclined surface (41a, 141a, 241a) in the up-down direction, and the separated member (42, 142, 242) includes a second inclined surface (43a, 143a, 243a) an inclination angle of which is identical with an inclination angle of the first inclined surface (41a, 141a, 241a), the separated member (42, 142, 242) being movable in the up-down direction while the second inclined surface (43a, 143a, 243a) is in contact with the first inclined surface (41a, 141a, 241a), wherein the separated member (42) is fixed to the first inclined surface (41a) by a bolt (45), and wherein the first inclined surface (41a, 241a) is inclined so that an upper end of the first inclined surface (41a, 241a) is close to the outer circumferential surface of the spinning pack (2) as compared to a lower end of the first inclined surface (41a, 241a), and the separated member (42, 242) is provided below the first inclined surface (41a, 241a).
  2. A melt spinning device (1, 101, 201, 301) comprising: a cylindrical spinning pack (2) including a spinneret (21) ; a heated box (3) including a concave portion (32) having an internal space into which the spinning pack (2) is inserted, the concave portion (32) being open downward; and a heat conduction mechanism (4, 104, 204, 304) including a separated member (42, 142, 242, 342) which is able to make contact with an outer circumferential surface of the spinning pack (2) inserted into the concave portion (32), the separated member (42, 142, 242, 342) being separated into plural members with respect to a circumferential direction of the spinning pack (2), the heat conduction mechanism (4, 104, 204, 304) further including one or more members which include at least the separated member (42, 142, 242, 342), and the one or more members forming a heat conduction path from a wall surface defining the concave portion (32) in the heated box (3) to the outer circumferential surface of the spinning pack (2) when the spinning pack (2) is inserted into the concave portion (32), wherein the heat conduction mechanism (4, 104, 204) further includes a first inclined surface (41a, 141a, 241a) provided to oppose the spinning pack (2) over the separated member (42, 142, 242), the first inclined surface (41a, 141a, 241a) being inclined so that one end of the first inclined surface (41a, 141a, 241a) in an up-down direction is close to the outer circumferential surface of the spinning pack (2) as compared to the other end of the first inclined surface (41a, 141a, 241a) in the up-down direction, and the separated member (42, 142, 242) includes a second inclined surface (43a, 143a, 243a) an inclination angle of which is identical with an inclination angle of the first inclined surface (41a, 141a, 241a), the separated member (42, 142, 242) being movable in the up-down direction while the second inclined surface (43a, 143a, 243a) is in contact with the first inclined surface (41a, 141a, 241a), wherein the first inclined surface (41a, 241a) is inclined so that an upper end of the first inclined surface (41a, 241a) is close to the outer circumferential surface of the spinning pack (2) as compared to a lower end of the first inclined surface (41a, 241a), the separated member (42, 242) is provided below the first inclined surface (41a, 241a), and wherein the heat conduction mechanism (204) further includes a biasing member (247) which applies an upward biasing force to the separated member (242).
  3. A melt spinning device (1, 101, 201, 301) comprising: a cylindrical spinning pack (2) including a spinneret (21); a heated box (3) including a concave portion (32) having an internal space into which the spinning pack (2) is inserted, the concave portion (32) being open downward; and a heat conduction mechanism (4, 104, 204, 304) including a separated member (42, 142, 242, 342) which is able to make contact with an outer circumferential surface of the spinning pack (2) inserted into the concave portion (32), the separated member (42, 142, 242, 342) being separated into plural members with respect to a circumferential direction of the spinning pack (2), the heat conduction mechanism (4, 104, 204, 304) further including one or more members which include at least the separated member (42, 142, 242, 342), and the one or more members forming a heat conduction path from a wall surface defining the concave portion (32) in the heated box (3) to the outer circumferential surface of the spinning pack (2) when the spinning pack (2) is inserted into the concave portion (32), the heat conduction mechanism (4, 104, 204) further including a first inclined surface (41a, 141a, 241a) provided to oppose the spinning pack (2) over the separated member (42, 142, 242), the first inclined surface (41a, 141a, 241a) being inclined so that one end of the first inclined surface (41a, 141a, 241a) in an up-down direction is close to the outer circumferential surface of the spinning pack (2) as compared to the other end of the first inclined surface (41a, 141a, 241a) in the up-down direction, the separated member (42, 142, 242) including a second inclined surface (43a, 143a, 243a) an inclination angle of which is identical with an inclination angle of the first inclined surface (41a, 141a, 241a), the separated member (42, 142, 242) being movable in the up-down direction while the second inclined surface (43a, 143a, 243a) is in contact with the first inclined surface (41a, 141a, 241a), the first inclined surface (141a) being inclined so that a lower end of the first inclined surface (141a) is close to the outer circumferential surface of the spinning pack (2) as compared to an upper end of the first inclined surface (141a), the separated member (142) being provided above the first inclined surface (141a), a concave portion (143d), which is open downward, being formed in the second inclined surface (143a), a screw hole (141b) being formed in a member (141) provided with the first inclined surface (141a), the screw hole (141b) being formed along the up-down direction and penetrating this member (141), a bolt (145a) being fitted to the screw hole (141b) in an upward direction, when a leading end of the bolt (145a) is positioned in the concave portion (143d), the separated member (142) being separated from an outer circumferential surface of the spinning pack (2), and when the leading end of the bolt (145a) is positioned in the screw hole (141b), the separated member (142) moves downward by the own weight of the separated member (142) to make contact with the outer circumferential surface of the spinning pack (2).
  4. The melt spinning device (1, 101, 201) according to any one of claims 1 to 3, wherein, the heat conduction mechanism (4, 104, 204) further includes: a fixing member (41, 141, 241) which is attached to the wall surface defining the concave portion (32) in the heated box (3), the fixing member (41, 141, 241) including the first inclined surface (41a, 141a, 241a); and a first heat insulation member (46a, 146a, 246a) which covers a lower surface of the fixing member (41, 141, 241) .
  5. A melt spinning device (1, 101, 201, 301) comprising: a cylindrical spinning pack (2) including a spinneret (21) ; a heated box (3) including a concave portion (32) having an internal space into which the spinning pack (2) is inserted, the concave portion (32) being open downward; and a heat conduction mechanism (4, 104, 204, 304) including a separated member (42, 142, 242, 342) which is able to make contact with an outer circumferential surface of the spinning pack (2) inserted into the concave portion (32), the separated member (42, 142, 242, 342) being separated into plural members with respect to a circumferential direction of the spinning pack (2), the heat conduction mechanism (4, 104, 204, 304) further including one or more members which include at least the separated member (42, 142, 242, 342), and the one or more members forming a heat conduction path from a wall surface defining the concave portion (32) in the heated box (3) to the outer circumferential surface of the spinning pack (2) when the spinning pack (2) is inserted into the concave portion (32), wherein a separated member (342) is supported by springs (341) which are compression coil springs configured to elongate and contract in the direction toward and away from the spinning pack (2).
  6. The melt spinning device (1, 101, 201, 301) according to one of the preceding claims, wherein, the separated member (42, 142, 242, 342) is configured to make contact with an area, the area being a part of the outer circumferential surface of the spinning pack (2) inserted into the concave portion (32), and the spinneret (21) being formed in the area in an axial direction of the spinning pack (2).
  7. The melt spinning device (1, 101, 201, 301) according to any one of claims 1 to 6, wherein, the heat conduction mechanism (4, 104, 204, 304) further includes a second heat insulation member (46b, 146b, 246b, 346b) which covers a lower surface of the separated member (42, 142, 242, 342).

Description

BACKGROUND OF THE INVENTION The present invention relates to a melt spinning device for producing a yarn from polymer. Typically, a melt spinning device includes (i) a heated box which is heated so that the temperature of the box is equal to or higher than a melting point of polymer and (ii) a spinning pack which is detachably attached to the heated box. In the melt spinning device, molten polymer supplied to the spinning pack via a polymer path is spun out from a spinneret of the spinning pack. The polymer path is formed inside the heated box. For example, JP 2012-102435 A discloses a heated box having a concave portion into which a spinning pack is inserted and which is open downward. In the concave portion, a pack attaching portion to which the spinning pack is attached is provided. There is a gap which is approximately 1 mm in width between a heated box and a spinning pack, i.e., between (i) a wall surface defining a concave portion formed in the heated box and (ii) the outer circumferential surface of the spinning pack attached to the pack attaching portion. To the spinning pack attached to the pack attaching portion, heat from the heated box is transferred via an air layer at this gap between the heated box and the spinning pack. Because heat resistance of the air layer is relatively high, the heat from the heated box may not be sufficiently transferred to the spinning pack. JP S60-86569 U discloses a melt spinning device in which a spinning pack (i.e., spinneret pack in JP S60-86569 U) includes a spinneret having a tapered outer circumferential surface. This melt spinning device includes a heating block which has a tapered inner circumferential surface and which is ring-shaped. The tapered inner circumferential surface of the heating block has the same inclination as that of the tapered outer circumferential surface of the spinning pack. The heating block is provided to be in contact with the outer circumferential surface of the spinneret of the spinning pack. Because of this, heat from the heating block is transferred to the spinning pack without passing the air layer. US 3 830 617 A is related to a melt spinning apparatus in which opposed heat transfer surfaces are gripped by displaceable further heat transfer surfaces. In this context, two parts of a wedge are slidably coupled by a bolt so as to displace heat transfer surfaces and exert pressure so as to ensure good heat transfer. A similar apparatus is known from "Spinning pack with wedge contact" published in Research Disclosure, Kenneth Mason publications, Hampshire, UK, GB, volume 122, number 19, June 1, 1974. Further background information relevant to the present invention may be found in the following documents, US 3,830,617 A, and Anonymous, "Spinning pack with wedge contact", RESEARCH DISCLOSURE, Kenneth Mason Publications, Hampshire, UK, vol. 122, no. 19, 1 June 1974, XP007102555, ISSN: 0374-4353. SUMMARY OF THE INVENTION JP S60-86569 U discloses a ring-shaped heating block which is in contact with the outer circumferential surface of a spinneret of a spinning pack. The heating block and the spinning pack may not be entirely in contact with each other but be partially in contact with each other because of, i.e., (i) the accuracy in production of members and (ii) the difference of positions between the heating block and the spinning pack. As a result, heat is transferred to the spinning pack unevenly in the circumferential direction of the spinning pack. An object of the present invention is to provide a melt spinning device which improves the efficiency in transferring heat from a heated box to a spinning pack, and which is able to suppress the heat transfer to the spinning pack in the circumferential direction of the spinning pack from becoming uneven. [Solution to Problem] The invention is defined in independent claims 1,2, 3 and 5. Preferred embodiments are described in the further claims. The invention is disclosed in alternative apparatus configurations corresponding to the embodiments described below. The following paragraphs describe aspects of the invention reflected in the claims. According to a first aspect of the invention, a melt spinning device includes: a cylindrical spinning pack including a spinneret; a heated box including a concave portion having an internal space into which the spinning pack is inserted, the concave portion being open downward; and a heat conduction mechanism including a separated member which is able to make contact with an outer circumferential surface of the spinning pack inserted into the concave portion, the separated member being separated into plural members with respect to a circumferential direction of the spinning pack, and the heat conduction mechanism further including one or more members which include at least the separated member, and the one or more members forming a heat conduction path from a wall surface defining the concave portion in the heated box to the outer circumferential surfac