CN111844675B - Extrusion preparation method of PTFE (polytetrafluoroethylene) high-density paste extrusion pipe with caliber of more than 400 - Google Patents
Extrusion preparation method of PTFE (polytetrafluoroethylene) high-density paste extrusion pipe with caliber of more than 400 Download PDFInfo
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- CN111844675B CN111844675B CN202010768036.XA CN202010768036A CN111844675B CN 111844675 B CN111844675 B CN 111844675B CN 202010768036 A CN202010768036 A CN 202010768036A CN 111844675 B CN111844675 B CN 111844675B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
- B29C48/83—Heating or cooling the cylinders
- B29C48/832—Heating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9115—Cooling of hollow articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/02—Moulding by agglomerating
- B29C67/04—Sintering
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
Abstract
The invention discloses an extrusion preparation method of a PTFE (polytetrafluoroethylene) high-density paste extrusion tube with more than 400 calibers, which comprises the steps of raw material mixing, preforming, extrusion molding, speed and position tracking of an extruded object, control of a feedback signal on the extruder, sintering molding, position measurement and feedback control of a product after sintering of a PTFE tube with an ultra-large caliber and a preparation method of a polytetrafluoroethylene dispersion resin tube molded product. The invention also discloses paste extrusion equipment for the ultra-large-diameter PTFE pipe fitting, which comprises an extrusion driving part, a pushing and pressing assembly, a mandrel assembly, a raw material barrel, an extrusion die and a thermal forming assembly which are coaxially and sequentially connected. The invention ensures that the forming, cooling and heating processes of the paste tube are more uniform, and improves the quality and yield of the paste tube.
Description
Technical Field
The invention relates to an extrusion preparation method of a PTFE (polytetrafluoroethylene) high-density paste extrusion pipe with a caliber of more than 400.
Background
Polytetrafluoroethylene (PTFE) has the best electrical insulation, chemical stability, corrosion resistance among all plastics, and is one of the best materials for corrosion resistance in the world today. However, Polytetrafluoroethylene (PTFE) dispersion resins have a very narrow phase transition range and a loose elastic character, making it difficult to extrude or injection mold like common thermoplastics. Extrusion of a paste mixture prepared by adding an appropriate organic solvent to a fine powder (PTFE dispersion resin) prepared by emulsion polymerization is a common production method of the PTFE dispersion resin. However, the production method cannot carry out continuous production due to the particularity of PTFE, the running state of each part of the production line needs to be controlled manually in the production process, certain requirements are made on the working experience of operators, the manual operation amount in the production process is large, and the stability of the product is obviously influenced by the operation. In addition, the quality of the paste tube is general at present, and besides the control factors on equipment and process, the reason that the cooling uniformity at the position of a formed tube cannot be achieved during cooling is also a great reason. In addition, the temperature heated in the hot forming heating stage almost reaches the set temperature at once, which is not good for the quality of the product, and if the temperature can be gradually increased along the feeding direction, the control of the quality of the product can be better.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the extrusion preparation method of the PTFE high-density paste extrusion pipe with the caliber of more than 400, so that the forming cooling and forming heating processes of the paste pipe are more uniform, and the quality and the yield of the paste pipe are improved.
In order to achieve the purpose, the technical scheme of the invention is to design a preparation method for extruding a PTFE high-density paste extruded tube with more than 400 calibers, which comprises the steps of raw material mixing, preforming, extrusion molding, extrudate speed and position tracking, extruder control by a feedback signal, sintering molding, and position measurement and feedback control of a product after sintering an ultra-large-caliber PTFE tube, and is characterized in that the preparation method for a polytetrafluoroethylene dispersion resin (PTFE) tube molded product comprises the following steps:
s1: mixing raw materials: fully and uniformly mixing polytetrafluoroethylene dispersion resin (PTFE) + solvent (Mofu ISOPAR G) according to the proportion of 10-20% at low temperature, wherein the rotating speed of a stirrer is lower than 30 revolutions per minute during mixing, and mixing for 5-20 minutes;
s2: placing the mixed raw materials at normal temperature for 16-24 h, wherein the temperature is 20-50 ℃;
s3: the mixed raw materials enter a die for prepressing, the pressure of a prepressing oil cylinder is 7MPa, the prepressing temperature is 50 ℃, and a cylindrical die blank with good appearance is formed;
s4: pushing the die blank into a pushing press, wherein the temperature of a material cylinder is 20-40 ℃, and a pipe fitting with a certain length is formed by pushing and pressing through a die;
s5: after the extruded pipe is discharged from the die opening, the position and the extrusion speed of the extruded pipe are measured by adopting a grating, a feedback signal is transmitted back to the extruder, and the extrusion is controlled by an automatic control system according to a measurement result;
s6: the extruded and molded pipe enters a sintering furnace to be sintered at high temperature, wherein the sintering temperature is 350-400 ℃, and the time is 30-40 seconds;
s7: quenching the sintered pipe;
in the step S7, cooling the pipe after thermoforming, that is, injecting cooling water into the outer layer of the cooling layer disposed on the outer surface of the thermoforming assembly, wherein the cooling water flows through a plurality of water outlet pipelines facing the inner layer and is discharged from a water outlet disposed against the outer wall of the inner layer, and the length of the cooling water flowing through each water outlet pipeline along the direction away from the discharge port of the thermoforming assembly and close to the discharge port of the thermoforming assembly is gradually reduced; in the step S3, the warm water cooled in the step S7 is returned to the outer layer of the raw material cylinder for preliminary pressing and heating. The cooled water (namely warm water) is guided back to be used for prepressing heating, so that the temperature of the prepressing heating part is not the same, the paste is gradually thermoformed, and the quality of the product is better. The PTFE paste tube with the caliber of more than 400 is generally a paste tube with the diameter of 400 mm. The length that cooling water flows through to being close to thermoforming subassembly discharge gate orientation along keeping away from the thermoforming subassembly discharge gate in each outlet conduit reduces's setting gradually, make the cooling water follow cooling water inlet input back, only need mention and select suitable water pump according to the degressive condition of outlet conduit length and accomplish the rivers of every outlet conduit pipe mouth department and arrive the inlayer outer wall almost simultaneously, can avoid in the past the cooling water to arrive earlier and keep away from thermoforming subassembly discharge gate department, just reach near thermoforming subassembly discharge gate department at last, whole cooling process's even has been guaranteed, the quality and the yields of pasting the cream pipe are improved.
The paste tube thermoforming equipment comprises an extrusion driving part, a pushing and pressing assembly, a mandrel assembly, a raw material barrel, an extrusion die and a thermoforming assembly which are coaxially and sequentially connected, wherein the extrusion driving part is installed at the tail part of a rack, one end of the pushing and pressing assembly is connected with the extrusion driving part, the other end of the pushing and pressing assembly is connected with one end of the mandrel assembly, the raw material barrel is installed at the front part of the rack, the extrusion die is installed at the outlet end of the raw material barrel, the mandrel assembly penetrates through the centers of the raw material barrel and the extrusion die, and the thermoforming assembly is supported in front of the rack and is concentric with the raw material barrel;
an annular heating mechanism is arranged outside the raw material barrel; the outer surface of the thermal forming assembly is coated with a cooling layer, the cooling layer consists of two layers, the outer layer is provided with a cooling water inlet, the inner layer is provided with a water outlet, the inner wall of the outer layer facing the inner layer is communicated with a plurality of water outlet pipelines, and the water outlets of all the water outlet pipelines are abutted against the outer wall of the inner layer; the water outlet pipeline is in a spiral pipeline form, a cooling water inlet is arranged on the outer layer far away from the discharge hole of the thermal forming assembly, and a water outlet is arranged on the inner layer close to the discharge hole of the thermal forming assembly;
the water outlet is communicated with a reuse water pipe for guiding and reusing the cooled warm water, and the other end of the reuse water pipe is positioned on the raw material barrel and is far away from the thermal forming assembly. Reuse water pipe one end lug connection warm water, the other end is located former feed cylinder, and keeps away from the thermoforming subassembly setting and can guide the warm water to the part that just begins to heat on the former feed cylinder for the heating process of raw materials section of thick bamboo outer wall heats along the feeding direction gradually, and the temperature is higher and higher, and not in the past the thickener once heated, and the quality of product obtains further improvement like this.
The further technical proposal is that the adopted solvent is Mobil ISOPAR G solvent oil which accounts for 10 to 20 weight percent of the mixed ingredients, and the ingredient proportion is changed along with the types of the resin.
The further technical scheme is that a temperature sectional control method is adopted for sintering when the pipe enters a sintering furnace for high-temperature sintering.
The further technical scheme is that the pushing process adopts automatic control.
The further technical scheme is that the automatic control is a linkage control system, and each part is monitored and subjected to feedback control in the pushing process.
The invention has the advantages and beneficial effects that: the forming cooling and forming heating processes of the paste tube are more uniform, and the quality and the yield of the paste tube are improved; the cooled water (namely warm water) is guided back to be used for prepressing heating, so that the temperature of the prepressing heating part is not the same, the paste is gradually thermoformed, and the quality of the product is better. Reuse water pipe one end lug connection warm water, the other end is located former feed cylinder, and keeps away from the thermoforming subassembly setting and can guide the warm water to the part that just begins to heat on the former feed cylinder for the heating process of raw materials section of thick bamboo outer wall heats along the feeding direction gradually, and the temperature is higher and higher, and not in the past the thickener once heated, and the quality of product obtains further improvement like this. The paste tube is more uniformly formed and cooled, and the quality and yield of the paste tube are improved. With the cooling water from the cooling water inlet input back, only need mention and select suitable water pump according to the degressive condition of outlet pipe way length and just accomplish the rivers of every outlet pipe way mouth department and arrive the inlayer outer wall almost simultaneously, can avoid in the past the cooling water to arrive earlier and keep away from thermoforming subassembly discharge gate department, just reachs near thermoforming subassembly discharge gate department at last, guaranteed whole cooling process's even, improve the quality and the yields of pasting the cream pipe.
Drawings
FIG. 1 is a schematic structural view of paste extrusion equipment for an ultra-large-diameter PTFE pipe fitting, which is involved in the extrusion preparation method of a PTFE high-density paste extrusion pipe with a diameter of more than 400 according to the invention;
FIG. 2 is a schematic view of a portion of the thermoformed assembly of FIG. 1.
In the figure: 1. an extrusion drive member; 2. a pushing assembly; 3. a mandrel assembly; 4. a raw material barrel; 5. extruding the mould; 6. a PTFE paste extruded tube; 7. a thermoformed component; 8. a frame; 9. a heating mechanism; 10. an outer layer; 11. a cooling water inlet; 12. an inner layer; 13. a water outlet; 14. a water outlet pipeline; 15. the water pipe is recycled.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The invention relates to a preparation method for extruding a PTFE (polytetrafluoroethylene) high-density paste extruded tube with more than 400 calibers, which comprises the steps of raw material mixing, preforming, extrusion molding, speed and position tracking of an extruded material, control of a feedback signal on an extruder, sintering molding, position measurement and feedback control of a product sintered by an ultra-large-caliber PTFE tube, and is characterized in that the preparation method for a polytetrafluoroethylene dispersion resin (PTFE) tube molded product comprises the following steps:
s1: mixing raw materials: fully and uniformly mixing polytetrafluoroethylene dispersion resin (PTFE) and a solvent (Mofu ISOPAR G) according to a proportion of 10-20% at a low temperature, wherein the rotating speed of a stirrer is lower than 30 revolutions per minute during mixing, and mixing for 5-20 minutes;
s2: placing the mixed raw materials at normal temperature for 16-24 h, wherein the temperature is 20-50 ℃;
s3: the mixed raw materials enter a die for prepressing, the pressure of a prepressing oil cylinder is 7MPa, and the prepressing temperature is 50 ℃, so that a cylindrical die blank with good appearance is formed;
s4: pushing the die blank into a pushing press, wherein the temperature of a material cylinder is 20-40 ℃, and a pipe fitting with a certain length is formed by pushing and pressing through a die;
s5: after the extruded pipe is discharged from the die opening, the position and the extrusion speed of the extruded pipe are measured by adopting a grating, a feedback signal is transmitted back to the extruder, and the extrusion is controlled by an automatic control system according to a measurement result;
s6: the extruded and molded pipe enters a sintering furnace to be sintered at high temperature, wherein the sintering temperature is 350-400 ℃, and the time is 30-40 seconds;
s7: quenching the sintered pipe;
in the step S7, the pipe after the hot forming is cooled, and in the step S3, the warm water cooled in the step S7 is returned to the outer layer of the raw material cylinder for preliminary heating.
The equipment used in the preparation method is shown in fig. 1 and fig. 2, and comprises an extrusion driving part 1, a pushing component 2, a mandrel component 3, a raw material barrel 4, an extrusion die 5 and a thermal forming component 7 which are coaxially and sequentially connected, wherein the extrusion driving part 1 is arranged at the tail part of a frame 8, one end of the pushing component 2 is connected with the extrusion driving part 1, the other end of the pushing component is connected with one end of the mandrel component 3, the raw material barrel 4 is arranged at the front part of the frame 8, the extrusion die 5 is arranged at the outlet end of the raw material barrel 4, the mandrel component 3 passes through the centers of the raw material barrel 4 and the extrusion die 5, and the thermal forming component 7 is supported in front of the frame 8 and is concentric with the raw material barrel 4. An annular heating mechanism 9 is arranged outside the raw material barrel (the heating mechanism 9 can be a coating layer, and a heating wire or an electric heating pipe is arranged in the heating mechanism 9, and the power of the electric heating pipe is greatly increased compared with that of the traditional paste pipe with 200-caliber or 150-caliber); the outer surface of the thermal forming component 7 is coated with a cooling layer, the cooling layer is composed of two layers, a cooling water inlet 11 is arranged on the outer layer 10, a water outlet 13 is arranged on the inner layer 12, a plurality of water outlet pipelines 14 are communicated with the inner wall of the outer layer 10 facing the inner layer 12, and water outlets of all the water outlet pipelines 14 are abutted against the outer wall of the inner layer 12. The water outlet pipe 14 is in the form of a spiral pipe, the cooling water inlet 11 is arranged on the outer layer 10 far away from the discharge port of the thermoforming assembly, and the water outlet 13 is arranged on the inner layer 12 near the discharge port of the thermoforming assembly. The length of cooling water flowing through each water pipeline along the direction from the discharge hole far away from the thermal forming assembly to the discharge hole close to the thermal forming assembly is gradually reduced. The extrusion driving part is an oil press. The water outlet 14 is communicated with a reuse water pipe 15 for guiding and reusing the cooled warm water, and the other end of the reuse water pipe is positioned on the raw material barrel and is far away from the thermal forming assembly.
Installing a die assembly 5 at the outlet end of the raw material barrel 4; preheating the feedstock by the thermoforming assembly 7; placing the prefabricated PTFE blank into a raw material cylinder 4; installing the mandrel component 3; starting an extrusion driving part 1, namely a high-power oil press, so that the pushing and pressing assembly 2 is in contact with the PTFE blank and pushes and presses at a preset speed; the pipe fitting is prefabricated through a PTFE paste extrusion pipe 6; the prefabricated pipe passes through the thermoforming component 7, and is a finished pipe of the PTFE paste extruded pipe.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
- The preparation method of the PTFE high-density paste extruded tube with the caliber of more than 1.400 comprises the steps of raw material mixing, preforming, extrusion molding, speed and position tracking of an extruded material, control of a feedback signal on the extruder, sintering molding, and position measurement and feedback control of a product after sintering of the PTFE tube with the ultra-large caliber, and is characterized in that the preparation method of a polytetrafluoroethylene dispersion resin (PTFE) tube molded product comprises the following steps:s1: mixing raw materials: fully and uniformly mixing Polytetrafluoroethylene (PTFE) dispersion resin and Mofu ISOPAR G solvent oil at low temperature, wherein the Mofu ISOPAR G solvent oil accounts for 10-20 wt% of the mixed ingredients, the rotating speed of a stirrer is lower than 30 revolutions per minute during mixing, and the mixing is carried out for 5-20 minutes;s2: placing the mixed raw materials at normal temperature for 16-24 h, wherein the temperature is 20-50 ℃;s3: the mixed raw materials enter a die for prepressing, the pressure of a prepressing oil cylinder is 7MPa, the prepressing temperature is 50 ℃, and a cylindrical die blank with good appearance is formed;s4: the die blank enters a pushing press machine for pushing, the temperature of a material cylinder is 20-40 ℃, and a pipe fitting with a certain length is formed through pushing of a die;s5: after the extruded pipe is discharged from the die opening, the position and the extrusion speed of the extruded pipe are measured by adopting a grating, a feedback signal is transmitted back to the extruder, and the automatic control system controls the extrusion according to the measurement result;s6: the extruded and molded pipe enters a sintering furnace to be sintered at high temperature, the sintering temperature is 350-400 ℃, the temperature is controlled in a segmented mode, and the time is 30-40 seconds;s7: quenching the sintered pipe;in the step S7, cooling the pipe after thermoforming, that is, injecting cooling water into the outer layer of the cooling layer disposed on the outer surface of the thermoforming assembly, wherein the cooling water flows through a plurality of water outlet pipelines facing the inner layer and is discharged from a water outlet disposed against the outer wall of the inner layer, and the length of the cooling water flowing through each water outlet pipeline along the direction away from the discharge port of the thermoforming assembly and close to the discharge port of the thermoforming assembly is gradually reduced; in the step S3, the warm water cooled in the step S7 is returned to the outer layer of the raw material cylinder for preliminary pressing and heating.
- 2. The extrusion preparation method of the PTFE high-density paste extruded tube with the caliber of more than 400 as claimed in claim 1, wherein the equipment used for thermal forming the paste tube comprises an extrusion driving part, a pushing and pressing component, a mandrel component, a raw material tube, an extrusion die and a thermal forming component which are coaxially and sequentially connected, the extrusion driving part is arranged at the tail part of the frame, one end of the pushing and pressing component is connected with the extrusion driving part, the other end of the pushing and pressing component is connected with one end of the mandrel component, the raw material tube is arranged at the front part of the frame, the extrusion die is arranged at the outlet end of the raw material tube, the mandrel component passes through the centers of the raw material tube and the extrusion die, and the thermal forming component is supported at the front part of the frame and is concentric with the raw material tube;an annular heating mechanism is arranged outside the raw material barrel; the outer surface of the thermal forming component is coated with a cooling layer, the cooling layer consists of two layers, the outer layer is provided with a cooling water inlet, the inner layer is provided with a water outlet, the inner wall of the outer layer facing the inner layer is communicated with a plurality of water outlet pipelines, and the water outlets of all the water outlet pipelines are arranged against the outer wall of the inner layer; the water outlet pipeline is in a spiral pipeline form, a cooling water inlet is arranged on the outer layer far away from the discharge hole of the thermal forming assembly, and a water outlet is arranged on the inner layer close to the discharge hole of the thermal forming assembly; the water outlet is communicated with a reuse water pipe for guiding and reusing the cooled warm water, and the other end of the reuse water pipe is positioned on the raw material barrel and is far away from the thermal forming assembly.
- 3. The extrusion preparation method of the PTFE high-density paste extruded tube with the caliber of more than 400 as claimed in claim 2, wherein the extrusion process is automatically controlled.
- 4. The extrusion preparation method of the PTFE high density paste extruded tube with the caliber above 400 as claimed in claim 3, wherein the automatic control is a linkage control system, and each part is monitored and feedback controlled in the extrusion process.
- 5. The extrusion preparation method of the PTFE high density paste extruded tube with the caliber of more than 400 as claimed in claim 4, wherein the extrusion driving part is an oil press.
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| CN202010768036.XA CN111844675B (en) | 2020-08-03 | 2020-08-03 | Extrusion preparation method of PTFE (polytetrafluoroethylene) high-density paste extrusion pipe with caliber of more than 400 |
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| CN111452331A (en) * | 2020-05-09 | 2020-07-28 | 安徽皖通管业制造有限公司 | PE100 level polyethylene pipe production is with cooling setting device |
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| CN111844675A (en) | 2020-10-30 |
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Denomination of invention: Extrusion Preparation Method for PTFE High Density Paste Extrusion Tube with a Diameter of Above 400 Effective date of registration: 20230320 Granted publication date: 20220819 Pledgee: Jiangyin branch of Bank of China Ltd. Pledgor: JIANGNAN FLUOROPLASTIC Co.,Ltd. Registration number: Y2023980035434 |