A semi-crystalline PEEK tube extrusion production device and method

Abstract

The present application discloses a semi-crystalline PEEK tube extrusion production device and method, including an extrusion production mold and a hot air cooling component; the extrusion production mold includes an extrusion die head, an extrusion diverter cone, an extrusion mandrel, an extrusion die and a die block, one end of the extrusion die is embedded in the discharge port end of the extrusion die head, the extrusion die head and the extrusion die head form a first cavity, the extrusion diverter cone and the extrusion mandrel are arranged in the first cavity, one end of the extrusion diverter cone is fixedly connected to the extrusion mandrel, and the other end of the extrusion diverter cone is a conical structure; the hot air cooling component includes a fixedly connected base and a cover plate; the axis of the base is provided with a first through hole, and a hot air inlet and a hot air cavity are provided on the base, and the hot air inlet is connected to the hot air cavity; the axis of the cover plate is provided with a second through hole, and the cover plate and the hot air cavity form an annular hole, and the hot air cavity is connected to the second through hole through the annular hole. The semi-crystalline PEEK tube extrusion production device and method provided by the present application improve the production efficiency of semi-crystalline PEEK tubes and help to ensure the production quality of semi-crystalline PEEK tubes.

Description

Technical Field

[0001] The present application relates to the technical field of PEEK tube production, and in particular to a semi-crystalline PEEK tube extrusion production device and method. Background Art

[0002] PEEK tube is made of polyetheretherketone (PEEK) material. As a new type of special engineering plastic, PEEK has extremely excellent physical and mechanical properties. It can replace traditional materials such as metals and ceramics in many special fields and has become one of the most popular high-performance engineering plastics today. In order to ensure that PEEK tubes fully demonstrate the excellent properties of PEEK materials, most of the PEEK tubes currently used are semi-crystalline PEEK tubes.

[0003] In the prior art, the manufacturing process of semi-crystalline PEEK tubes is as follows: PEEK embryo tubes are manufactured by extruders, and PEEK embryo tubes are heat treated in ovens. Since the conditions suitable for crystallization of PEEK materials are very limited, especially the temperature range of crystallization is very small, and the cooling process cannot be too fast, during the extrusion and shaping process, if the cooling is fast, there will be no crystallization or very little crystallization, so post-crystallization heat treatment is required. In this production process, the manufactured PEEK embryo tubes are first cooled by air, then heated and kept warm in an oven for a certain period of time, and finally slowly cooled, which is time-consuming and wastes energy. In addition, when the PEEK embryo tubes are heat treated in an oven, since the PEEK embryo tubes are in a non-crystalline state, they are easily heated unevenly in the oven, which often causes some pipes to have different degrees of crystallinity during the crystallization process of heat treatment, resulting in different shrinkage rates, causing the two ends of the pipes to be easily deformed, the entire pipe to bend, etc., and the inner and outer diameters vary with the degree of crystallization, which greatly affects the accuracy of the product. Summary of the invention

[0004] The present application provides a semi-crystalline PEEK tube extrusion production device and method, which improves the production efficiency of the semi-crystalline PEEK tube and helps to ensure the production quality of the semi-crystalline PEEK tube.

[0005] In a first aspect, the present application provides a semi-crystalline PEEK tube extrusion production device, comprising an extrusion production die and a hot air cooling component arranged close to but not in contact with each other, wherein the central axis of the extrusion production die coincides with the central axis of the hot air cooling component; wherein:

[0006] The extrusion production mold comprises an extrusion die head, an extrusion flow dividing cone, an extrusion core rod, an extrusion die and a die block, one end of the extrusion die head is embedded in the discharge port end of the extrusion die head, the extrusion die head and the extrusion die head form a first cavity, the extrusion flow dividing cone and the extrusion core rod are arranged in the first cavity, one end of the extrusion flow dividing cone is fixedly connected to the extrusion core rod, the other end of the extrusion flow dividing cone is a conical structure, and the die block abuts against and supports the extrusion die head and is fixedly connected to the extrusion die head;

[0007] The hot air cooling assembly includes a base and a cover plate that are fixedly connected; a first through hole is arranged at the axis of the base, a hot air inlet is arranged on the base, a hot air cavity is arranged on the base, and the hot air inlet is connected to the hot air cavity; a second through hole is arranged at the axis of the cover plate, the diameter of the second through hole is greater than or equal to the diameter of the first through hole, the cover plate and the hot air cavity form an annular hole, and the hot air cavity is connected to the second through hole through the annular hole.

[0008] Optionally, in the above-mentioned semi-crystalline PEEK tube extrusion production device, a blowing inlet is arranged on the extrusion die head, a first blowing cavity is arranged on the extrusion diverter cone, and a second blowing cavity is arranged on the extrusion core rod. The blowing inlet, the first blowing cavity and the second blowing cavity are connected in sequence, and the tail end of the second blowing cavity is connected to the embryo outlet of the extrusion die.

[0009] Optionally, in the above-mentioned semi-crystalline PEEK tube extrusion production device, the inner surface of the hot air cavity is a truncated cone slope.

[0010] Optionally, in the above-mentioned semi-crystalline PEEK tube extrusion production device, the second through hole is a tapered hole, and the large-diameter end of the tapered hole is close to the base.

[0011] Optionally, in the above-mentioned semi-crystalline PEEK tube extrusion production device, the base is provided with a threaded hole, and the threaded hole is used for fixing the base.

[0012] Optionally, in the above-mentioned semi-crystalline PEEK tube extrusion production device, the cone angle of the cone structure is greater than or equal to 80°.

[0013] Optionally, in the above-mentioned semi-crystalline PEEK tube extrusion production device, the extrusion die head includes a conical second cavity, and the conical structure end of the extrusion splitter cone is located in the second cavity.

[0014] In a second aspect, based on the semi-crystalline PEEK tube extrusion production device provided in the first aspect of the present application, the present application further provides a semi-crystalline PEEK tube extrusion production method, the method comprising:

[0015] Drying PEEK particles;

[0016] The dried PEEK particles are injected into an extruder, and a PEEK tube embryo is extruded through the extruder;

[0017] Passing the PEEK tube embryo through a hot air cooling assembly for crystallization, wherein the temperature of the hot air is 80-250° C.;

[0018] The PEEK tube blank passing through the hot gas cooling assembly through which hot gas is passed is air cooled to obtain a semi-crystalline PEEK tube.

[0019] Optionally, in the above semi-crystalline PEEK tube extrusion production method, the drying of PEEK particles comprises:

[0020] The PEEK particles were dried in a drying oven at 160° C. for 8 hours.

[0021] Optionally, in the above semi-crystalline PEEK tube extrusion production method, the method further comprises:

[0022] After the extruder extrude the PEEK tube embryo, the PEEK tube embryo is internally blown to shape.

[0023] The semi-crystalline PEEK tube extrusion production device and method provided in the present application directly perform crystallization treatment through a hot air cooling component after the PEEK tube embryo is extruded from the extruder, and there is no need to perform crystallization heat treatment through an oven, thereby achieving one-time molding of the semi-crystalline PEEK tube, reducing energy waste, improving the production efficiency of the semi-crystalline PEEK tube, and helping to ensure the production quality of the semi-crystalline PEEK tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] Figure 1 A three-dimensional diagram of a semi-crystalline PEEK tube extrusion production device provided in an embodiment of the present application;

[0026] Figure 2 A cross-sectional view of a semi-crystalline PEEK tube extrusion production device provided in an embodiment of the present application;

[0027] Figure 3 A cross-sectional view of an extrusion die head provided in an embodiment of the present application;

[0028] Figure 4 An assembly cross-sectional view of an extrusion die head and an extrusion die provided in an embodiment of the present application;

[0029] Figure 5 A stereoscopic view of an extrusion splitter cone provided in an embodiment of the present application.

[0030] in:

[0031] 100-extrusion production mold, 101-extrusion die head, 102-extrusion diverter cone, 103-extrusion core rod, 104-extrusion die, 105-first cavity, 106-blowing inlet, 107-first blowing cavity, 108-second blowing cavity, 109-second cavity, 110-die block, 200-hot air cooling assembly, 201-base, 202-cover plate, 203-first through hole, 204-hot air inlet, 205-hot air cavity, 206-second through hole, 207-annular hole. DETAILED DESCRIPTION

[0032] The semi-crystalline PEEK tube extrusion production device and method provided in the present application improve the production efficiency of the semi-crystalline PEEK tube and help ensure the production quality of the semi-crystalline PEEK tube.

[0033] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0034] See attached Figure 1-5 , Figure 1-5 The basic structure of the semi-crystalline PEEK tube extrusion production device provided in the embodiment of the present application is shown. The semi-crystalline PEEK tube extrusion production device provided in the embodiment of the present application is described below in conjunction with each of the accompanying drawings.

[0035] As attached Figure 1 and 2 As shown, the semi-crystalline PEEK tube extrusion production device provided in the embodiment of the present application includes an extrusion production die 100 and a hot air cooling component 200 that are arranged close to each other but not in contact. Among them:

[0036] The extrusion production mold 100 includes an extrusion die head 101, an extrusion flow dividing cone 102, an extrusion core rod 103, an extrusion die 104 and a die block 110. One end of the extrusion die 104 is embedded in the discharge port end of the extrusion die head 101. The extrusion die 104 and the extrusion die head 101 form a first cavity 105. The extrusion flow dividing cone 102 and the extrusion core rod 103 are arranged in the first cavity 105. One end of the extrusion flow dividing cone 102 is fixedly connected to the extrusion core rod 103. The other end of the extrusion flow dividing cone 102 is a conical structure. The die block 110 abuts against and supports the extrusion die 104 and is fixedly connected to the extrusion die head 101.

[0037] The hot air cooling assembly 200 includes a base 201 and a cover plate 202 that are fixedly connected; a first through hole 203 is arranged at the axis of the base 201, a hot air inlet 204 is arranged on the base 201, a hot air cavity 205 is arranged on the base 201, and the hot air inlet 204 is connected to the hot air cavity 205; a second through hole 206 is arranged at the axis of the cover plate 202, the diameter of the second through hole 206 is greater than or equal to the diameter of the first through hole 203, the first through hole 203 is concentric or nearly concentric with the second through hole 206, the cover plate 202 and the hot air cavity 205 form an annular hole 207, and the hot air cavity 205 is connected to the second through hole 206 through the annular hole 207.

[0038] The extrusion production die 100 is used for extrusion forming of a PEEK tube embryo of a semi-crystalline PEEK tube. One end of the extruder is connected to the extruder, and the other end is the PEEK tube embryo outlet. The molten material conveyed by the extruder enters from one end of the extrusion production die 100, and then outputs the PEEK tube embryo through the other end of the extrusion production die 100. The hot air cooling component 200 is used for crystallization of the PEEK tube embryo. Specifically, the PEEK tube embryo produced by extrusion production die 100 passes through the hot air cooling component 200 after coming out of the extrusion production die 100. In order to facilitate the smooth passage of the PEEK tube embryo during the processing, the central axis of the extrusion production die 100 coincides with the central axis of the hot air cooling component 200.

[0039] In the specific implementation manner of this application, as shown in the attached Figure 2-4 As shown, one end of the extrusion die 101 is used to connect to the extruder, and the other end is used to embed the extrusion die 104. There is a cavity in the extrusion die 101, which is used to hold the extrusion diverter cone 102 and the extrusion core rod 103 and convey the material delivered by the extruder. The extrusion die 101 and the extrusion die 104 form a first cavity 105, and the extrusion diverter cone 102 and the extrusion core rod 103 are arranged in the first cavity 105.

[0040] The extrusion core rod 103 cooperates with the extrusion die 104 , and the extrusion core rod 103 and the extrusion die 104 are combined to form a channel for the molten material to flow and an outlet that meets the size of the semi-crystalline PEEK tube.

[0041] As attached Figure 2 and 5As shown, one end of the extrusion diverter cone 102 is connected to the extrusion core rod 103 for fixing the position of the extrusion diverter cone 102; one end is set to a conical structure for diverting the molten material and guiding the molten material; the molten material passes through the extrusion diverter cone 102 and flows into the extrusion core rod 103 and the extrusion die 104 to form a channel for the molten material to flow. In a specific embodiment of the present application, the cone angle of the conical structure is greater than or equal to 80°, preferably 90-120°, and the diversion effect is more obvious, ensuring the uniformity of the flow of the molten material. In addition, a through cavity for the flow of the molten material is set on the extrusion diverter cone 102,

[0042] In a specific embodiment of the present application, the extrusion die 101 includes a conical second cavity 109, and the conical structure end of the extrusion diverter cone 102 is located in the second cavity 109. The conical second cavity 109 is used to achieve a gradual change in the cross-sectional area of ​​the cavity of the extrusion die 101, and the conical second cavity 109 helps to achieve coordination with the conical structure of the extrusion diverter cone 102, thereby facilitating the uniformity of the flow of the molten material and ensuring the flow rate of the molten material.

[0043] The die block 110 is fixedly connected to the extrusion die head 101 and is used to fix the extrusion die 104 . The extrusion die head 101 is usually connected with bolts to facilitate the disassembly and replacement of the extrusion die head 101 .

[0044] The cover plate 202 seals the hot air cavity 205 of the base 201 with an annular hole 207, that is, the hot air enters from the hot air inlet 204, disperses in the hot air cavity 205, and is discharged through the annular hole 207. The discharged hot air is used for the crystallization of the PEEK tube embryo. Specifically, the hot air forms the conditions for the crystallization of the PEEK tube embryo in the form of blowing through the hot air cooling component, and the PEEK tube embryo is quickly cooled to the hot air temperature by the hot air flow. The temperature of the hot air is 80-250°C. Generally, the temperature of the hot air should be higher than the temperature suitable for PEEK crystallization, about 210 to 250 degrees. The hot air cooling component 200 is supported and fixed by a bracket. Specifically, a threaded hole is set on the base 201, one end of the bracket is fixed to the base 201 through the threaded hole, and the other end of the bracket is fixedly connected to the extruder.

[0045] The extrusion production mold 100 and the hot air cooling assembly 200 are close but not in contact, that is, the extrusion production mold 100 and the hot air cooling assembly 200 can be relatively close but not touching. The closer they are, the earlier the PEEK tube embryo will be shaped. However, if they are touching, the temperature of the mold will be reduced, making the surface of the PEEK tube rough. In the specific implementation of the present application, the number of hot air cooling assemblies 200 is not limited to one, and the number of hot air cooling assemblies 200 can be selected according to the thickness of the PEEK tube embryo and actual needs.

[0046] In the semi-crystalline PEEK tube extrusion production device provided in the embodiment of the present application, after the PEEK tube embryo exits the die, the temperature of the PEEK tube embryo quickly drops to below 260 degrees due to the action of hot air, making it hard and fixed, but the temperature of the PEEK tube embryo is still close to the temperature of the hot air, and it drops very slowly, which is conducive to the crystallization of the PEEK tube embryo, and the extruded PEEK tube embryo is kept warm and crystallized, so that the crystallinity of the PEEK tube embryo remains consistent during the production process. And the crystallinity of the PEEK tube embryo can be adjusted by adjusting the hot air temperature and flow rate control. Among them, the crystallinity can be directly observed from the color and transparency of the surface of the produced pipe. PEEK in a completely amorphous state is coffee-colored and transparent, and crystallized PEEK is beige and opaque. As the crystallinity increases, its color changes from dark to light, and its transparency changes from transparent to opaque.

[0047] The semi-crystalline PEEK tube extrusion production device provided in the embodiment of the present application directly performs crystallization treatment through a hot air cooling component after the PEEK tube embryo is extruded from the extruder, and does not need to be subjected to crystallization heat treatment in an oven, thereby achieving one-time molding of the semi-crystalline PEEK tube, reducing energy waste, improving the production efficiency of the semi-crystalline PEEK tube, and helping to ensure the production quality of the semi-crystalline PEEK tube.

[0048] To further optimize the technical solution, in the semi-crystalline PEEK tube extrusion production device provided in the embodiment of the present application, a blowing inlet 106 is provided on the extrusion die head 101, a first blowing cavity 107 is provided on the extrusion diverter cone 102, and a second blowing cavity 108 is provided on the extrusion mandrel 103. The blowing inlet 106, the first blowing cavity 107 and the second blowing cavity 108 are connected in sequence, and the tail end of the second blowing cavity 108 is connected to the embryo outlet of the extrusion die 104, which is used to blow air into the PEEK tube embryo produced by the extruder for blow molding. Blow molding uses a gas mass flowmeter to quantitatively blow air into the inner cavity of the embryo to ensure its size, roundness and shape.

[0049] In the specific implementation of the present application, the inner surface of the hot air cavity 205 is a truncated cone slope. Figure 2 As shown, the cross section of the hot air cavity 205 is an inclined surface, which is inclined away from the extrusion production mold 100, which helps to improve the uniformity of hot air circulation, ensure that the hot air flows out of the annular hole 207 evenly, and ensure the uniform heating of the PEEK tube embryo.

[0050] Furthermore, the second through hole 206 is a tapered hole, and the large diameter end of the tapered hole is close to the base 201. The tapered hole has a guiding effect on the hot air, so that the hot air diffuses along the moving direction of the PEEK tube embryo, thereby improving the utilization rate of the hot air.

[0051] Based on the semi-crystalline PEEK tube extrusion production device provided in the embodiment of the present application, the present application also provides a semi-crystalline PEEK tube extrusion production method, the method comprising:

[0052] Drying PEEK particles;

[0053] The dried PEEK particles are injected into an extruder, and a PEEK tube embryo is extruded through the extruder;

[0054] Passing the PEEK tube embryo through a hot air cooling assembly for crystallization, wherein the temperature of the hot air is 80-250° C.;

[0055] The PEEK tube blank passing through the hot gas cooling assembly through which hot gas is passed is air cooled to obtain a semi-crystalline PEEK tube.

[0056] Further, in the semi-crystalline PEEK tube extrusion production method provided in the embodiment of the present application, the drying of the PEEK particles comprises:

[0057] The PEEK particles were dried in a drying oven at 160° C. for 8 hours.

[0058] Further, in the semi-crystalline PEEK tube extrusion production method provided in the embodiment of the present application, the method further includes:

[0059] After the extruder extrude the PEEK tube embryo, the PEEK tube embryo is internally blown to shape.

[0060] Each embodiment in this specification is described in a progressive manner, and the same and similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments, and the relevant parts refer to the partial description of the method embodiment. It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. After considering the specification and practicing the invention here, those skilled in the art will easily think of other embodiments of the present application. This application is intended to cover any variation, use or adaptive change of the present application, which follows the general principles of the present application and includes common knowledge or customary technical means in the art that are not invented in this application. The specification and embodiments are only regarded as exemplary, and the true scope and spirit of the present application are indicated by the following claims.

[0061] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A semi-crystalline PEEK tube extrusion production device, characterized in that: It comprises an extrusion production die and a hot air cooling component which are arranged close to each other but not in contact, and the central axis of the extrusion production die coincides with the central axis of the hot air cooling component; wherein: The extrusion production mold comprises an extrusion die head, an extrusion flow dividing cone, an extrusion core rod, an extrusion die and a die block, one end of the extrusion die head is embedded in the discharge port end of the extrusion die head, the extrusion die head and the extrusion die head form a first cavity, the extrusion flow dividing cone and the extrusion core rod are arranged in the first cavity, one end of the extrusion flow dividing cone is fixedly connected to the extrusion core rod, the other end of the extrusion flow dividing cone is a conical structure, and the die block abuts against and supports the extrusion die head and is fixedly connected to the extrusion die head; The extrusion die head is provided with a blowing inlet, the extrusion diverter cone is provided with a first blowing cavity, the extrusion mandrel is provided with a second blowing cavity, the blowing inlet, the first blowing cavity and the second blowing cavity are connected in sequence, and the tail end of the second blowing cavity is connected with the embryo outlet of the extrusion die; The hot air cooling assembly comprises a base and a cover plate which are fixedly connected; a first through hole is arranged at the axis of the base, a hot air inlet is arranged on the base, a hot air cavity is arranged on the base, and the hot air inlet is connected to the hot air cavity; a second through hole is arranged at the axis of the cover plate, the diameter of the second through hole is greater than or equal to the diameter of the first through hole, the cover plate and the hot air cavity form an annular hole, and the hot air cavity is connected to the second through hole through the annular hole; The inner surface of the hot air cavity is a truncated cone slope; The second through hole is a tapered hole, and the large diameter end of the tapered hole is close to the base; the large diameter of the second through hole is greater than or equal to the diameter of the first through hole; The method for extrusion production using the semi-crystalline PEEK tube extrusion production device comprises: Drying PEEK particles; The dried PEEK particles are injected into an extruder, and a PEEK tube embryo is extruded through the extruder; Passing the PEEK tube embryo through a hot air cooling assembly for crystallization, wherein the temperature of the hot air is 80-250° C.; The PEEK tube blank passing through the hot gas cooling assembly through which hot gas is passed is air cooled to obtain a semi-crystalline PEEK tube.

2. The semi-crystalline PEEK tube extrusion production device according to claim 1, characterized in that: The base is provided with a threaded hole, and the threaded hole is used for fixing the base.

3. The semi-crystalline PEEK tube extrusion production device according to claim 1, characterized in that: The cone angle of the cone structure is greater than or equal to 80°.

4. The semi-crystalline PEEK tube extrusion production device according to claim 1, characterized in that: The extrusion die head comprises a conical second cavity, and the conical structure end of the extrusion splitter cone is located in the second cavity.

5. The semi-crystalline PEEK tube extrusion production device according to claim 1, characterized in that: The drying of PEEK particles comprises: The PEEK particles were dried in a drying oven at 160° C. for 8 hours.

6. The semi-crystalline PEEK tube extrusion production device according to claim 1, characterized in that: The method further comprises: After the extruder extrude the PEEK tube embryo, the PEEK tube embryo is internally blown to shape.

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