CN111976184A - Production process of bidirectional expanded polytetrafluoroethylene sealing material - Google Patents
Production process of bidirectional expanded polytetrafluoroethylene sealing material Download PDFInfo
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- CN111976184A CN111976184A CN201910440456.2A CN201910440456A CN111976184A CN 111976184 A CN111976184 A CN 111976184A CN 201910440456 A CN201910440456 A CN 201910440456A CN 111976184 A CN111976184 A CN 111976184A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D99/00—Subject matter not provided for in other groups of this subclass
- B29D99/0053—Producing sealings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D99/00—Subject matter not provided for in other groups of this subclass
- B29D99/0089—Producing honeycomb structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
- B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
- B29K2027/18—PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene
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Abstract
The invention discloses a production process of a bidirectional expanded polytetrafluoroethylene sealing material, which comprises the steps of sleeving a bidirectional stretched polytetrafluoroethylene film on a unwinding roller, measuring the initial transverse thickness of a base film, measuring a plurality of points, observing the difference of the film thickness and recording; the elimination process is selected according to the difference of the film thickness. Pressing the wound film, and performing re-pressing; putting the re-pressed film and the cylindrical finished product roller into a shaping and heating device for shaping; naturally cooling the finished roller and the material after shaping to obtain a finished product; and (4) putting the cooled finished product roller and the cooled material into a cooling water tank again for secondary cooling to finish the production of the expanded polytetrafluoroethylene sealing material. According to the invention, through unreeling and laminating, the direction of the film can be changed, and the thickness can be measured through secondary unreeling, so that the uniformity of the thickness of the material is controlled, and the bonding force between the films is higher through salt bath sizing.
Description
Technical Field
The invention relates to a production process of a sealing material, in particular to a production process of a bidirectional expanded polytetrafluoroethylene sealing material.
Background
The bidirectional stretching expanded polytetrafluoroethylene sealing material is a porous, low-density and high-toughness material. The PTFE material not only inherits the good thermal stability, chemical stability, low surface friction coefficient and ductility of the traditional PTFE material, but also has the new characteristics of higher mechanical strength, porosity, air permeability, hydrophobicity, excellent flexibility and the like, and has wide application in the fields of machinery, electronics, electrical appliances, communication, environmental protection, aerospace industry and the like. The existing production process of the bidirectional stretching expanded polytetrafluoroethylene sealing material is a flat sealing material laminating mode, the bidirectional stretching polytetrafluoroethylene films are folded back and forth together, and then the bidirectional stretching polytetrafluoroethylene films are shaped and combined together in a mode of heating the sealing material up and down by two blocks. The biaxially oriented expanded polytetrafluoroethylene sealing material formed in such a manner has poor thickness uniformity of the sealing material, poor interlayer bonding force between material films, and insufficient continuous length of the sealing material cut into strips, which increasingly fails to meet market demands.
Patent application No. 200810034888.5 discloses a method for molding a continuous polytetrafluoroethylene biaxial stretching sealing material, which solves the problems that the polytetrafluoroethylene biaxial stretching sealing material in the prior art is difficult to produce continuously and has low production efficiency.
Patent application No. 201510922128.8 discloses a method for preparing an expanded polytetrafluoroethylene composite membrane, which comprises the steps of adding a protective cover to a roller coated with a membrane under the condition of an existing membrane covering machine set, and cooling the roller together with the protective cover during heat treatment. The protective cover can effectively reduce the cooling speed of the composite membrane in the cooling process, the method can eliminate the bulge problem of the expanded polytetrafluoroethylene composite membrane on the roller after heat treatment, and the product quality is improved.
The method discloses a preparation method of biaxially oriented polytetrafluoroethylene, which improves the quality of polytetrafluoroethylene materials on the basis of the prior art, but solves the problems that the thickness difference of the prior polytetrafluoroethylene is large, the interlayer bonding force between material films is poor, and the continuous length of the sealing material cut into strips is insufficient.
Disclosure of Invention
The invention aims to solve the defects that the existing production process for laminating the sealing material causes large thickness difference of a bidirectional stretching expanded polytetrafluoroethylene sealing material, poor interlayer bonding force between material films, insufficient continuous length of strips cut by the sealing material and the like.
In order to solve the technical problems, the invention provides the following technical scheme:
a production process of a bidirectional expanded polytetrafluoroethylene sealing material comprises the following steps:
1) covering the biaxially oriented polytetrafluoroethylene film on a unwinding roller, measuring the initial transverse thickness of the base film (measuring the width of the film, measuring one point every 12-14cm at an average interval of 1.65-1.75m width), measuring about 12-14 points, and observing and recording the difference of the film thickness;
2) winding the biaxially oriented polytetrafluoroethylene film on the unwinding roller onto a cylindrical finished product roller through an unwinding device;
3) setting different pressures on the film wound on the cylindrical finished product roller through a cylindrical compression roller to tightly attach the film together; controlling the pressure to be 0.4-0.6 MPa;
4) measuring the thickness of the film on a cylindrical finished product roller after winding and laminating for 5min by using a high-precision thickness gauge, marking the position of the finished product roller corresponding to the first step of the process, measuring the width of the film to be 1.65-1.75m, measuring 12-14 points at intervals of 12-14cm according to average distance, observing the difference of the transverse thickness of the film after winding and laminating for 5min, and performing the following step a according to the difference: if the thickness difference of the films on the two sides is too large, if the thickness difference is (1.25, 1.24, 1.23, 1.17, 11.1, 1.09, 1.05, 1.01, 0.98, 0.97, 0.95, 0.93) mm, the film on the unwinding roller is rotated 180 degrees clockwise, and is wound and laminated again for 5min, and the thickness at the time is recorded as 2.18, 2.17, 2.16, 2.10, 2.09, 2.13, 2.12, 2.09, 2.17, 2.16, 2.15, 2.14mm until the transverse thickness difference of the film on the cylindrical finished roller is not large; b: if the middle thickness of the film is too different from the thicknesses of two sides, such as 1.25, 1.24, 1.23, 1.21, 1.0, 0.98, 0.95, 0.97, 1.05, 1.23, 1.25, 1.23 and 1.26mm, the transverse thicknesses of the films are 1.73, 1.69, 1.71, 1.72, 1.73, 1.70, 1.68, 1.74, 1.75, 1.76, 1.72 and 1.74 mm after the secondary complementary unwinding and lamination for 10 circles until the transverse thicknesses of the films on the cylindrical finished roll are not different from those of the films on the left and right sides, the biaxially oriented polytetrafluoroethylene films with the larger middle thickness are adopted, such as 0.05, 0.048, 0.047, 0.042, 0.071, 0.072, 0.069, 0.047, 0.046 and 0.043 mm; if the film thickness is more uniform, recording the whole transverse thickness of the film on the cylindrical finished product roller after the preset trial-manufacture thickness is reached, and measuring 12-14 points, such as 1.51, 1.53, 1.52, 1.50, 1.49, 1.56, 1.54, 1.53, 1.48, 1.56, 1.49 and 1.52;
5) Re-pressing the wound film in the previous step for 5-10min at 0.4-0.6 MPa;
6) and (3) putting the re-pressed film and a cylindrical finished product roller into a shaping heating device for shaping, wherein the shaping temperature is 350-370 ℃ (the interlayer bonding force between the films is lower than 350 ℃ through production summary shaping temperature), and the shaping time is 5-25 min.
7) Naturally cooling the finished roller and the material after shaping to a finished product, wherein the temperature of the lower end of the original roller is 250-260 ℃, and the material cooled to 250-260 ℃ has the best hand feeling according to the production summary;
8) putting the cooled finished product roller and the cooled material into a cooling water tank again for secondary cooling for 2-5 min;
9) and cutting the material subjected to secondary cooling into sealing material materials or strips.
The shaping heating device is an oven or a heating plate.
Compared with the prior art, the invention has the following remarkable advantages:
1) according to the invention, through unreeling and laminating, the direction of the film can be changed, the thickness can be measured through secondary unreeling, and the uniformity of the thickness of the material can be controlled;
2) the binding force between the layers of the films is higher through salt bath sizing;
3) the invention can cut strips and plates with different specifications and sizes at will.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The production process of the biaxially oriented expanded polytetrafluoroethylene sealing material of the invention is described in detail below with reference to process flow diagrams and specific examples:
example 1: for case a (180 clockwise rotation of film on unwind roll); the following describes the present invention in detail by taking the preparation of expanded polytetrafluoroethylene sealing material with thickness of 0.78 + -0.1 mm and density of 0.4-0.6g/cm as an example:
for preparation of 0.78. + -. 0.1mm, density 0.4-0.6g/cm3Setting the initial pressing composite thickness to be 1.1-1.2mm and the post-pressing thickness to be 1.0-1.1 mm; the initial pressure and the secondary pressure are 0.4MPa, the setting temperature is 360 ℃, the setting time is 8min, the primary cooling temperature is 260 ℃, and the secondary cooling is 2 min;
1) sleeving a biaxially oriented polytetrafluoroethylene film on a unwinding roller, measuring the initial transverse thickness of the base film, measuring about 12-14 points, observing the difference of the film thickness, and recording; overall initial base film thickness 40, 35, 34, 32, 30, 25, 24, 22, 21, 20, 19, 17 (here unit thickness is um);
2) winding the biaxially oriented polytetrafluoroethylene film on the unwinding roller onto a cylindrical finished product roller through an unwinding device, adjusting the pressure to be 0.4MPa, and measuring the overall film thickness to be 0.81, 0.72, 0.68, 0.64, 0.60, 0.5, 0.48, 0.44, 0.42, 0.4, 0.38 and 0.34 (the unit thickness is mm) when the number of winding turns is 20, clockwise rotating the film on the unwinding roller by 180 degrees, and measuring the overall film thickness after winding for 20 turns again: 1.14, 1.16, 1.15, 1.20, 1.21, 1.22, 1.18, 1.17, 1.16, 1.15, 1.13, 1.14 (here in mm of unit thickness);
3) And (3) finishing unreeling the film after the initial pressing is finished, re-pressing for 5min under 0.4MPa, and measuring the overall re-pressing thickness as follows: 1.08, 1.09, 1.05, 1.06, 1.10, 1.09, 1.08, 1.04, 1.06, 1.03, 1.06 (here in mm of unit thickness);
4) putting the re-pressed film and a cylindrical finished product roller into a shaping heating device for shaping, wherein the shaping temperature is 360 ℃, and the shaping time is 8 min;
5) cooling the shaped material and the finished roller in a natural environment until the temperature of the lower end of the finished roller is 260 ℃;
6) putting the cooled finished product roller and the cooled material into a cooling water tank again for secondary cooling for 2 min;
7) the thickness of the whole material after cooling is measured as follows: 0.78, 0.76, 0.79, 0.82, 0.85, 0.86, 0.83, 0.79, 0.82, 0.76, 0.78 and 0.79, the final material has relatively uniform forming thickness (unit thickness is mm in the present case);
8) the measured material is cut into the desired sealing material and tape.
Example 2: for case a (no clockwise 180 ° adjustment of the film on the unwind roll); the following describes the present invention in detail by taking the preparation of expanded polytetrafluoroethylene sealing material with thickness of 0.78 + -0.1 mm and density of 0.4-0.6g/cm as an example:
For preparation of 0.78. + -. 0.1mm, density 0.4-0.6g/cm3Setting the initial pressing composite thickness to be 1.1-1.2mm and the post-pressing thickness to be 1.0-1.1 mm; the initial pressure and the secondary pressure are 0.4MPa, the setting temperature is 360 ℃, the setting time is 8min, the primary cooling temperature is 260 ℃, and the secondary cooling is 2 min;
1) sleeving a biaxially oriented polytetrafluoroethylene film on a unwinding roller, measuring the initial transverse thickness of the base film, measuring about 12-14 points, observing the difference of the film thickness, and recording; overall initial base film thickness 40, 35, 34, 32, 30, 25, 24, 22, 21, 20, 19, 17 (here unit thickness is um);
2) winding the biaxially oriented polytetrafluoroethylene film on the unwinding roller onto a cylindrical finished product roller through an unwinding device, adjusting the pressure to be 0.4MPa, and measuring the overall film thickness to be 0.81, 0.72, 0.68, 0.64, 0.60, 0.5, 0.48, 0.44, 0.42, 0.4, 0.38 and 0.34 (the unit thickness is mm) when the number of winding turns is 20, without adjustment, and measuring the overall film thickness after winding for 20 turns again: 1.62, 1.46, 1.36, 1.28, 1.20, 1.0, 0.96, 0.88, 0.84, 0.8, 0.76, 0.68 (here in mm of unit thickness);
3) and (3) finishing unreeling the film after the initial pressing is finished, re-pressing for 5min under 0.4MPa, and measuring the overall re-pressing thickness as follows: 1.56, 1.35, 1.26, 1.18, 1.1, 1.0, 0.86, 0.78, 0.74, 0.7, 0.66, 0.65 (here in mm of unit thickness);
4) Putting the re-pressed film and a cylindrical finished product roller into a shaping heating device for shaping, wherein the shaping temperature is 360 ℃, and the shaping time is 8 min;
5) cooling the shaped material and the finished roller in a natural environment until the temperature of the lower end of the finished roller is 260 ℃;
6) putting the cooled finished product roller and the cooled material into a cooling water tank again for secondary cooling for 2 min;
7) the thickness of the whole material after cooling is measured as follows: 1.23, 1.18, 1.05, 0.95, 0.82, 0.83, 0.79, 0.65, 0.62, 0.6, 0.54, 0.45 and 0.44 of the final material with larger forming thickness deviation (here, the unit thickness is mm);
from the above two examples, it can be seen that if the film is not rotated by 180 ° in the initial pressing stage under the condition of the occurrence of the condition a, the final forming thickness of the material is larger while smaller.
Example 3: for case b (carry out the second complementary type unreeling winding lamination)
The following describes the present invention in detail by taking the preparation of expanded polytetrafluoroethylene sealing material with thickness of 1.18 + -0.13 mm and density of 0.4-0.6g/cm as an example:
for preparation of 1.18. + -. 0.13mm, density 0.4-0.6g/cm3Setting the initial composite thickness of the product to be 1.75-1.85mm and the post-composite thickness to be 1.65-1.75 mm; the initial pressure and the secondary pressure are 0.45MPa, the setting temperature is 365 ℃, the setting time is 15min, the primary cooling temperature is 250 ℃, and the secondary cooling is 2 min;
Sleeving a biaxially oriented polytetrafluoroethylene film on a unwinding roller, measuring the initial transverse thickness of the base film, measuring about 12-14 points, observing the difference of the film thickness, and recording; overall initial base film thickness 40, 42, 40, 30, 25, 22, 21, 30, 41, 42, 43 (here unit thickness is um);
2) winding the biaxially oriented polytetrafluoroethylene film on the unwinding roller onto a cylindrical finished product roller through an unwinding device, adjusting the pressure to be 0.4MPa, and when the number of winding turns is 20, measuring the overall film thickness to be 0.8, 0.84, 0.8, 0.6, 0.44, 0.42, 0.6, 0.82, 0.84, 0.86 (the unit thickness is mm), and similarly using the biaxially oriented polytetrafluoroethylene films with larger middle thickness and thinner left and right sides to be 0.05, 0.048, 0.047, 0.042, 0.071, 0.072, 0.069, 0.068, 0.049, 0.047, 0.046, 0.043 (the unit thickness is mm), and after carrying out secondary complementary winding and laminating for 20 turns, measuring the overall film thickness: 1.78, 1.79, 1.82, 1.83, 1.74, 1.79, 1.83, 1.75, 1.82, 1.79, 1.80, 1.74 (here in mm of unit thickness);
3) and (3) finishing unreeling the film after the initial pressing is finished, re-pressing for 5min under 0.45MPa, and measuring the overall re-pressing thickness as follows: 1.68, 1.69, 1.72, 1.73, 1.64, 1.69, 1.73, 1.65, 1.72, 1.69, 1.7, 1.64 (here in mm of unit thickness);
4) Putting the re-pressed film and a cylindrical finished product roller into a shaping heating device for shaping, wherein the shaping temperature is 365 ℃, and the shaping time is 15 min;
5) cooling the shaped material and the finished product roller in a natural environment until the temperature of the lower end of the finished product roller is 250 ℃;
6) putting the cooled finished product roller and the cooled material into a cooling water tank again for secondary cooling for 2 min;
7) the thickness of the whole material after cooling is measured as follows: 1.23, 1.18, 1.15, 1.24, 1.17, 1.19, 1.16, 1.18, 1.15, 1.19, 1.21 and 1.22, the final material has uniform forming thickness (unit thickness is mm in the embodiment);
8) taking a section of material to carry out interlayer binding force detection, wherein the test result is 1.1N/cm
Example 4: for case b (not performing secondary complementary unreeling winding lamination)
The following describes the present invention in detail by taking the preparation of expanded polytetrafluoroethylene sealing material with thickness of 1.18 + -0.13 mm and density of 0.4-0.6g/cm as an example:
for preparation of 1.18. + -. 0.13mm, density 0.4-0.6g/cm3Setting the initial composite thickness of the product to be 1.75-1.85mm and the post-composite thickness to be 1.65-1.75 mm; the initial pressure and the secondary pressure are 0.45MPa, the setting temperature is 365 ℃, the setting time is 15min, the primary cooling temperature is 250 ℃, and the secondary cooling is 2 min;
Sleeving a biaxially oriented polytetrafluoroethylene film on a unwinding roller, measuring the initial transverse thickness of the base film, measuring about 12-14 points, observing the difference of the film thickness, and recording; overall initial base film thickness 40, 42, 40, 30, 25, 22, 21, 30, 41, 42, 43 (here unit thickness is um);
2) winding the biaxially oriented polytetrafluoroethylene film on the unwinding roller onto a cylindrical finished product roller through an unwinding device, adjusting the pressure to be 0.4MPa, and measuring the thickness of the whole film to be 0.8, 0.84, 0.8, 0.6, 0.44, 0.42, 0.6, 0.82, 0.84 and 0.86 (the unit thickness is mm) when the number of winding turns is 20, wherein the thickness of the whole film is measured after the film is not subjected to secondary complementary unwinding, winding and laminating for 25 turns: 1.8, 1.79, 1.82, 1.68, 1.35, 1.28, 1.30, 1.34, 1.65, 1.76, 1.80, 1.74 (here in mm of unit thickness);
3) and (3) finishing unreeling the film after the initial pressing is finished, re-pressing for 5min under 0.45MPa, and measuring the overall re-pressing thickness as follows: 1.7, 1.69, 1.72, 1.58, 1.2, 1.25, 1.3, 1.55, 1.65, 1.7, 1.64 (here in mm of unit thickness);
4) putting the re-pressed film and a cylindrical finished product roller into a shaping heating device for shaping, wherein the shaping temperature is 365 ℃, and the shaping time is 15 min;
5) Cooling the shaped material and the finished product roller in a natural environment until the temperature of the lower end of the finished product roller is 250 ℃;
6) putting the cooled finished product roller and the cooled material into a cooling water tank again for secondary cooling for 2 min;
7) the thickness of the whole material after cooling is measured as follows: 1.18, 1.15, 1.16, 0.95, 0.7, 0.65, 0.63, 0.65, 0.89, 1.09, 1.18 and 1.15 of the final material with larger forming thickness deviation (here, the unit thickness is mm);
according to the two examples, on the premise that the condition b occurs, the material is not subjected to secondary complementary type unreeling, winding and laminating, the final forming thickness of the material is thicker at two sides, and thinner in the middle.
Example 5: aiming at the setting temperature of lower than 350 DEG C
The following describes the present invention in detail by taking the preparation of expanded polytetrafluoroethylene sealing material with thickness of 1.18 + -0.13 mm and density of 0.4-0.6g/cm as an example:
the specific implementation completely refers to example 3, the setting temperature is changed to 340 ℃, the interlayer bonding force between the films is finally detected to be 0.55N/cm, and the interlayer bonding force is poor, so that the final material is easy to delaminate, according to the summary of production experience, the setting temperature is 350-370 ℃, the interlayer bonding force between the films is optimal and is kept at 1.0-1.8N/cm, and the material with good bonding force is not easy to delaminate.
The expanded polytetrafluoroethylene sealing material finally prepared through the steps is uniform in thickness and high in interlayer bonding force.
The density of the expanded polytetrafluoroethylene sealing material prepared by the invention is 0.4-0.6 g/cm. The method can also be applied to expanded polytetrafluoroethylene sealing materials with other densities, and the pressure of the compression roller is correspondingly adjusted.
The setting temperature and the setting time are different for materials with different specifications, and the details are shown in a table 1:
TABLE 1 design process parameter table
Claims (5)
1. A production process of a bidirectional expanded polytetrafluoroethylene sealing material is characterized by comprising the following steps:
sleeving a biaxially oriented polytetrafluoroethylene film on an unwinding roller, measuring the initial transverse thickness of the base film, measuring about 12-14 points, observing the difference of the film thickness and recording;
winding the polytetrafluoroethylene film stretched in two directions on the unwinding roller onto a cylindrical finished product roller through an unwinding device;
setting different pressures on the film wound on the cylindrical finished product roller through a cylindrical compression roller to tightly attach the film together;
measuring the thickness of a film on a cylindrical finished product roller after winding and laminating for 5min by using a high-precision thickness gauge, marking the fixed position of the finished product roller, wherein the width of the film is generally 1.65-1.75m, measuring 12-14 points corresponding to the first step procedure at an average interval of 12-14cm, observing the difference of the transverse thickness of the film after winding and laminating for 5min, and eliminating the difference according to the different differences, wherein the step a comprises the following steps: if the thickness difference of the films on the two sides is too large, the film on the unwinding roller is rotated by 180 degrees clockwise, and is wound and laminated for 5min again, and the thickness at the moment is recorded until the transverse thickness difference of the film on the cylindrical finished product roller is not large; b: if the difference between the middle thickness of the film and the thicknesses of the two sides of the film is too large, the biaxially oriented polytetrafluoroethylene film with the large middle thickness and the thin left and right sides of the film is adopted, and after 10 circles of secondary complementary unreeling, winding and laminating are carried out until the difference between the transverse thicknesses of the films on the cylindrical finished product roller is not large; c, if the thickness of the film is more uniform, recording the integral transverse thickness of the film on the cylindrical finished product roller after the preset trial-manufacture thickness is reached, and measuring 12-14 points;
The wound film is initially pressed in the previous procedure, and then re-pressing is carried out;
putting the re-pressed film and the cylindrical finished product roller into a shaping and heating device for shaping;
naturally cooling the finished roller and the material after shaping to obtain a finished product;
putting the cooled finished product roller and the cooled material into a cooling water tank again for secondary cooling for 2-5 min;
and cutting the material subjected to secondary cooling into sealing material materials or strips.
2. The process for producing an expanded polytetrafluoroethylene sealing material according to claim 1, wherein the press rolls are set to have different pressures of 0.4 to 0.6 MPa.
3. The process for producing an expanded polytetrafluoroethylene sealing material according to claim 1, wherein the re-pressing conditions are as follows: the repressing time is 5-10min, and the repressing pressure is 0.4-0.6 Mpa.
4. The process for producing expanded polytetrafluoroethylene sealing material according to claim 1, wherein the setting temperature is 350 ℃ to 370 ℃ and the setting time is 5 to 25 min.
5. The process for producing an expanded polytetrafluoroethylene sealing material according to claim 1, wherein the shaping and heating device is an oven or a heating plate.
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| CN115923205A (en) * | 2023-02-20 | 2023-04-07 | 四川省众望科希盟科技有限公司 | Method and system for laminating multilayer films for sealing aerospace flap structure |
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| CN208738179U (en) * | 2018-10-11 | 2019-04-12 | 长鑫存储技术有限公司 | Semiconductor thin film structure |
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| CN115923205A (en) * | 2023-02-20 | 2023-04-07 | 四川省众望科希盟科技有限公司 | Method and system for laminating multilayer films for sealing aerospace flap structure |
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