A regenerated polyester forming mold for chemical fiber with uniform heating structure

Abstract

The utility model discloses a kind of regenerated polyester forming mould for chemical fibre with uniform heating structure, including mould, resistance wire and fin, mould is horizontally arranged, the first end of mould is connected with screw extruder, the end of mould is connected with spinning beam, mould is sequentially divided into cylindrical end and conical end along melt flow direction, the outside surface of cylindrical end is embedded with helical resistance wire, the outside of cylindrical end is provided with heat insulation film, resistance wire is located between the outside surface of cylindrical end and heat insulation film, the outside of heat insulation film is provided with hollow heat insulation layer, the inside of cylindrical end is equipped with coaxial heating inner core, the outside surface of conical end is provided with fin, by the inside and outside collaborative heating mode of the multilayer heating structure outside cylindrical end and internal heating, so that melt is kept at uniform and stable temperature in cylindrical end, by setting radiating fin on the surface of conical end, effectively improve heat dissipation efficiency, inhibit the overheating risk of regenerated polyester in melt channel end.

Description

Technical Field

[0001] This utility model relates to the field of fiber production technology, specifically to a recycled polyester molding die for chemical fibers with a uniform heating structure. Background Technology

[0002] In the utility model patent application with publication number CN205800137U, publication date of December 14, 2016, entitled "Spinning Masterbatch Production Equipment", this utility model relates to spinning masterbatch production equipment. The key features of the solution are: the spinning masterbatch production equipment includes a twin-screw extruder with an inlet and an outlet. The inlet is connected to a dye addition device, and the outlet is connected to a forming mold. The dye addition device includes a storage funnel, and the bottom of the storage funnel is provided with a feeding turntable. The feeding turntable includes a circular turntable body and a component consisting of the turntable body... The rotating disc has radially outwardly distributed perturbation teeth in its central part. A central boss in the central part of the disc pushes the raw material outward from the center. A material discharge hole is provided between adjacent perforation teeth in the circumferential direction of the rotating disc. A material discharge channel is provided below the material discharge hole to convey the material to the inlet. The forming mold includes a die head with a forming hole at its head. An inner cavity communicating with the forming hole is provided inside the die head. A conical groove is provided in the inner cavity corresponding to the conical position of the head. An external heating device is provided on the outside of the die head. A heating mandrel is located at the center of the inner cavity. The advantages are: this invention provides an external heating device on the outside of the die head and a heating mandrel at the center of the inner cavity, thus heating both the inside and outside of the forming mold and avoiding uneven heating of the raw material.

[0003] In the aforementioned patents or prior art, during the spinning process of recycled polyester, the forming die is set between the screw extruder and the spinning box. The first end of the die is connected to the screw extruder, and the last end of the die is connected to the spinning box. The molten recycled polyester needs to maintain a stable temperature inside the die. Then, along the direction of melt flow, the cross-sectional area of ​​the melt channel shrinks, causing axial thermal imbalance inside the die. This results in local overheating in the end area of ​​the die, which leads to carbonization of impurities in the recycled polyester and blockage of the spinneret micropores. Utility Model Content

[0004] The purpose of this invention is to provide a mold for molding recycled polyester for chemical fibers with a uniform heating structure, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a mold for molding recycled polyester for chemical fibers with a uniform heating structure, comprising: a mold, a resistance wire, and fins;

[0006] The die is set horizontally, with the first end of the die connected to the screw extruder and the last end of the die connected to the spinning box. The die is divided into a cylindrical end and a conical end along the melt flow direction. The outer surface of the cylindrical end is inlaid with a spiral resistance wire, and the outer surface of the conical end is provided with radial fins.

[0007] Furthermore, a heat insulation film is provided on the outer side of the cylindrical end, and the resistance wire is located between the outer surface of the cylindrical end and the heat insulation film.

[0008] Furthermore, a vacuum insulation layer is provided on the outer side of the heat insulation film.

[0009] Furthermore, a columnar heating core is provided inside the cylindrical end along its own axis, and the heating core is fixedly connected to the inner wall of the cylindrical end through multiple star-shaped brackets.

[0010] Furthermore, the star-shaped support includes multiple legs, each with a left-hand or right-hand groove on its end surface, and adjacent legs have opposite rotation directions at their ends.

[0011] Furthermore, the height of the fins increases continuously along the melt flow direction, the cross-section of the fins is teardrop-shaped, and the thickness of the bottom of the fins is greater than the thickness of the top.

[0012] Compared with the prior art, the beneficial effects of this utility model are: the recycled polyester molding die for chemical fibers with a uniform heating structure is reasonable and has the following advantages:

[0013] (1) This technical solution solves the problem of uneven temperature of recycled polyester melt after entering the mold through the multi-level heating structure of the cylindrical end. The resistance wire embedded in the outer surface of the cylindrical end directly heats the mold base. With the synergistic heat insulation of the outer heat insulation film and the vacuum heat insulation layer, the heat loss is significantly reduced. The coaxial heating core is stably supported by the star bracket. The left and right swirling grooves on the surface of its legs drive the melt to generate bidirectional swirling flow, effectively eliminating the stagnant area behind the bracket. This internal and external synergistic heating system makes the melt maintain a uniform and stable temperature at the cylindrical end.

[0014] (2) The technical solution optimizes the flow effect of the melt in the mold by alternating rotation of the star-shaped support. The left and right swirling grooves at the ends of adjacent legs induce shear vortices in opposite directions, forming a self-balancing micro-mixing zone inside the melt. This efficiently breaks down impurity polymers in the recycled polyester. At the same time, the fluid generated by the swirling collision continuously washes and heats the inner core surface, preventing impurity deposition and carbonization. This maintains the smoothness of the flow channel and makes the internal orientation structure of the chemical fiber tend to be balanced, avoiding the brittle fracture defects of the chemical fiber caused by traditional unidirectional flow.

[0015] (3) This technical solution improves heat dissipation efficiency by setting radial fins on the surface of the cone end. The fins are designed with a gradually increasing height along the melt flow direction, which is exactly in line with the trend of increasing heat flux density at the cone end. The teardrop-shaped cross section combined with the thickened bottom structure maximizes the heat dissipation surface area while ensuring mechanical strength. The radial arrangement of the fins guides the airflow to penetrate the gap between the fins along the curved surface, eliminates the airflow dead zone of the parallel fins, effectively suppresses the risk of overheating of recycled polyester at the end of the flow channel, and ensures stable molding of the melt. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0018] Figure 3 This utility model Figure 2 A magnified view of a portion at point A shown;

[0019] Figure 4 This is a three-dimensional structural diagram of the cylindrical end and the resistance wire in this utility model;

[0020] Figure 5 This is a three-dimensional structural diagram of the heating core and star-shaped support in this utility model;

[0021] Figure 6 This utility model Figure 5 A magnified view of a portion of point B is shown below;

[0022] Figure 7 This is a three-dimensional structural diagram of the conical end and fins of this utility model;

[0023] In the diagram: 1. Mold; 11. Cylindrical end; 12. Conical end; 2. Resistance wire; 3. Heat insulation film; 4. Vacuum heat insulation layer; 5. Heating core; 6. Star-shaped bracket; 61. Left-hand groove; 62. Right-hand groove; 7. Fin. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-7 The present invention provides a technical solution as follows:

[0026] Example 1:

[0027] In this embodiment, a mold for molding recycled polyester for chemical fibers with a uniform heating structure is provided, comprising: mold 1, resistance wire 2 and fins 7;

[0028] The mold 1 is set horizontally. The first end of the mold 1 is connected to the screw extruder, and the second end of the mold 1 is connected to the spinning box. The mold 1 is divided into a cylindrical end 11 and a conical end 12 along the melt flow direction. The outer surface of the cylindrical end 11 is inlaid with a spiral resistance wire 2, and the outer surface of the conical end 12 is provided with radial fins 7.

[0029] A heat insulation film 3 is provided on the outer side of the cylindrical end 11, and the resistance wire 2 is located between the outer surface of the cylindrical end 11 and the heat insulation film 3.

[0030] A vacuum insulation layer 4 is provided on the outside of the heat insulation film 3.

[0031] A columnar heating core 5 is provided inside the cylindrical end 11 along its own axis. The heating core 5 is fixedly connected to the inner wall of the cylindrical end 11 by multiple star-shaped brackets 6.

[0032] The star-shaped support 6 includes multiple legs, and each leg has a left-hand groove 61 or a right-hand groove 62 on its end surface. The rotation directions of adjacent legs are opposite.

[0033] The height of fin 7 increases continuously along the melt flow direction. The cross-section of fin 7 is teardrop-shaped, and the thickness of the bottom of fin 7 is greater than that of the top.

[0034] Working principle: In use, firstly, recycled polyester enters the cylindrical end 11 of the die 1 from the screw extruder. At this time, the resistance wire 2 embedded in the surface of the cylindrical end 11 directly heats the inside of the die 1. At the same time, the heat insulation film 3 and the vacuum heat insulation layer 4 work together to block heat leakage. The heating core 5, which is coaxially set with the cylindrical end 11, starts at the same time. The left-hand swirling groove 61 and the right-hand swirling groove 62 set on the end surface of the legs of the star-shaped support 6 guide the melt to generate bidirectional swirling flow, eliminate the stagnation area behind the star-shaped support 6, and enhance radial heat exchange.

[0035] Secondly, when the melt flows through the cylindrical end 11, a uniform temperature field is formed under the combined action of the internal and external heating sources and the swirling disturbance. The impurity clusters in the melt are sheared by the swirling flow, preventing impurities from adhering to the surface of the heating core 5, so that the melt can maintain a stable temperature inside the cylindrical end 11.

[0036] Finally, when the melt enters the conical end 12, the radial fins 7 on the outer wall can match the heat load distribution through the gradually increasing height design. The teardrop-shaped cross section optimizes the airflow penetration efficiency, quickly removes the shear heat of the melt and the heat stored in the mold 1, prevents overheating at the end from causing carbonization, and ultimately ensures that the melt with a uniform temperature is stably transported to the spinning box to form chemical fibers.

[0037] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A molding die for recycled polyester fibers with a uniform heating structure, characterized in that, include: Mold (1), resistance wire (2) and fins (7); The mold (1) is set horizontally. The first end of the mold (1) is connected to the screw extruder, and the last end of the mold (1) is connected to the spinning box. The mold (1) is divided into a cylindrical end (11) and a conical end (12) along the melt flow direction. The outer surface of the cylindrical end (11) is inlaid with a spiral resistance wire (2), and the outer surface of the conical end (12) is provided with radial fins (7).

2. The recycled polyester molding die for chemical fibers with a uniform heating structure according to claim 1, characterized in that, A heat insulation film (3) is provided on the outer side of the cylindrical end (11), and the resistance wire (2) is located between the outer surface of the cylindrical end (11) and the heat insulation film (3).

3. The recycled polyester molding die for chemical fibers with a uniform heating structure according to claim 2, characterized in that, A vacuum insulation layer (4) is provided on the outside of the heat insulation film (3).

4. The recycled polyester molding die for chemical fibers with a uniform heating structure according to claim 1, characterized in that, The cylindrical end (11) has a columnar heating core (5) arranged along its own axis inside. The heating core (5) is fixedly connected to the inner wall of the cylindrical end (11) by multiple star-shaped brackets (6).

5. A mold for molding recycled polyester for chemical fibers with a uniform heating structure according to claim 4, characterized in that, The star-shaped support (6) includes multiple legs, and each leg has a left-handed groove (61) or a right-handed groove (62) on its end surface, with the rotation directions of adjacent legs being opposite.

6. A mold for molding recycled polyester for chemical fibers with a uniform heating structure according to claim 1, characterized in that, The height of the fin (7) increases continuously along the melt flow direction. The cross-section of the fin (7) is teardrop-shaped. The thickness of the bottom of the fin (7) is greater than the thickness of the top.

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