CN114407381A - PTFE film transverse stretching uniformity adjusting device and application - Google Patents
PTFE film transverse stretching uniformity adjusting device and application Download PDFInfo
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- CN114407381A CN114407381A CN202111367464.2A CN202111367464A CN114407381A CN 114407381 A CN114407381 A CN 114407381A CN 202111367464 A CN202111367464 A CN 202111367464A CN 114407381 A CN114407381 A CN 114407381A
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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
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
- B29C69/02—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore of moulding techniques only
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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
- B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
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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
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
- B29C43/24—Calendering
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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
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/16—Straightening or flattening
- B29C53/18—Straightening or flattening of plates or sheets
-
- 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
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
- B29C55/08—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique transverse to the direction of feed
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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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- 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
- B29L2007/00—Flat articles, e.g. films or sheets
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention discloses a PTFE film transverse stretching uniformity adjusting device which comprises an unwinding roller, a degreasing box, a positioning roller, a transmission roller, an olive roller device for extruding the middle part of a blank film, a flattening roller, a static eliminating device and a winding roller, wherein the unwinding roller, the degreasing box, the positioning roller, the transmission roller, the olive roller device for extruding the middle part of the blank film, the flattening roller, the static eliminating device and the winding roller are sequentially arranged; the olive roller device comprises a plurality of olive roller pieces, and the olive roller pieces are in a shape of a football with the diameter gradually reduced from the middle area to the two ends. The invention also discloses a preparation method of the PTFE membrane by using the device. According to the invention, the middle part of the blank film is extruded through the olive rolls, so that the middle part is thin, the olive rolls are distributed into an upper row and a lower row, the upper row and the lower row are respectively driven by two motors, the speeds of the two motors are different, the rotating speed of the upper row of olive roll pieces is less than that of the lower row of olive roll pieces, the blank film passing through the olive rolls is gradually stretched through the speed difference of the two rows of olive rolls, the width is gradually expanded, and the problem of uneven stress caused by one-time stretching is solved.
Description
Technical Field
The invention relates to the technical field of PTFE (polytetrafluoroethylene) film production, in particular to a PTFE film transverse stretching uniformity adjusting device and application thereof.
Background
Polytetrafluoroethylene (PTFE) is known as the "king of plastics" because of its good chemical and electrical properties. The PTFE microporous membrane prepared by PTFE is widely applied to the fields of chemical industry, electronics, petroleum, instruments and meters and the like. The preparation process mainly utilizes the oil absorption and insolubility of PTFE resin and the volatile characteristic of olefin materials to form micropores; by utilizing the characteristic that PTFE plastics before the curing temperature also have plasticity, the PTFE microporous membrane is stretched in two directions within the processing range of the process temperature section, and finally, the required PTFE microporous membrane is obtained through high-temperature sintering, curing and molding.
The PTFE film is produced mainly through rolling, turning, stretching, etc. Only the stretched film had a good microporous structure by structural analysis and practical measurement. The PTFE film is produced by mixing PTFE resin with extrusion assistant, pressing into blank, extruding, rolling and other steps. Under heating, the extrusion aid is removed and simultaneously stretching is carried out to form a microfibrillar microporous film. Generally, the transverse stretching is performed by a heating curing device; for example, patent No. CN202110604508.2 discloses a full-automatic production line and process for twisted yarn of split PTFE fiber, which includes a stretching and sintering device for continuously heating and stretching PTFE film. The film obtained by the method has the uneven phenomenon that the middle part of the film cannot be stretched due to trapezoidal spreading, because the stress is gradually transmitted from the edge to the middle part during the transverse stretching, attenuation and hysteresis effects exist in the process, so that the thickness of the middle area of the film is larger than that of the two side areas, the result that the aperture of the middle area is small and the apertures of the two side areas are large is generated, and the using effect of the PTFE film is influenced.
Disclosure of Invention
The invention aims to solve the technical problem of uneven middle stretching of a film obtained by the existing heating curing type transverse stretching device for a PTFE film.
The invention solves the technical problems through the following technical means:
a PTFE membrane transverse stretching uniformity adjusting device comprises an unwinding roller for winding a blank membrane, a degreasing box for removing an extrusion aid, a positioning roller, a transmission roller, an olive roller device for extruding the middle part of the blank membrane, a flattening roller for flattening the extruded blank membrane, a static eliminating device for eliminating the static electricity of the blank membrane and a winding roller for automatically winding a thin film, which are sequentially arranged; the olive roller device comprises a plurality of olive roller pieces, and the olive roller pieces are in a shape of a football with the diameter gradually reduced from the middle area to the two ends; the olive roller pieces are regularly arranged up and down, the upper row and the lower row of the olive roller pieces are respectively driven by two motors, and the rotating speed of the olive roller pieces on the upper row is lower than that of the olive roller pieces on the lower row;
the method comprises the steps of placing a blank film on an unwinding roller, setting the temperature and the speed in a degreasing box to set values, removing an extrusion aid through the degreasing box, conveying the PTFE film to an olive roller device through a positioning roller and a driving roller in sequence, thinning the middle part of the PTFE blank film under the extrusion action of the olive roller device, flattening the extruded blank film by using a flattening roller, removing the static electricity of the blank film through a static electricity eliminating device, and finally winding by using a winding roller to obtain the PTFE blank film with thin middle and thick two sides.
According to the invention, the middle part of the blank film is extruded through the olive rolls, so that the middle part is thin, the olive rolls are distributed into an upper row and a lower row, the upper row and the lower row are respectively driven by two motors, the speeds of the two motors are different, the rotating speed of the upper row of olive roll pieces is less than that of the lower row of olive roll pieces, the blank film passing through the olive rolls is gradually stretched through the speed difference of the two rows of olive rolls, the width is gradually expanded, and the problem of uneven stress caused by one-time stretching is solved.
Preferably, the left degreasing temperature of the degreasing box is controlled to be 150-170 ℃, and the right degreasing temperature is controlled to be 170-190 ℃.
Preferably, the stretching left temperature of the degreasing box is controlled to be 210-230 ℃, and the stretching right temperature is controlled to be 210-230 ℃.
Preferably, the unreeling speed of the degreasing box is 1.8 m/min.
Preferably, the degreasing speed of the degreasing box is 1.8 m/min.
Preferably, the longitudinal drawing speed of the degreasing box is set as follows: the first drawing speed is 1.8m/min, the second drawing speed is 3m/min, the third drawing speed is 4.6m/min, the fourth drawing speed is 6m/min, and the fifth drawing speed is 7.6 m/min.
Preferably, the traction speed of the degreasing box is 7.8 m/min.
A method for preparing a PTFE membrane comprises the following steps:
(a) mixing PTFE resin and an extrusion aid, extruding and prepressing to obtain a blank film;
(b) performing secondary rolling on the blank film obtained in the step (a) by adopting the PTFE film transverse stretching uniformity adjusting device to obtain a PTFE blank film with a thin middle part and thick two sides;
(c) and (c) placing the PTFE blank membrane treated by the PTFE membrane transverse stretching uniformity adjusting device in the step (b) on a unreeling frame of a transverse drawing machine, and adjusting the stretching width, transverse drawing temperature and transverse drawing speed parameters of the transverse drawing machine to obtain the required finished PTFE membrane.
Further, the process conditions of the pre-pressing in the step (a) are set as follows: the water tank temperature is 45-55 ℃, the neck ring mold temperature is 40-50 ℃, the material cylinder temperature is 40-50 ℃, the blank film heat preservation temperature is 30-40 ℃, the upper cylinder descending time is 90-100s, the lower cylinder ascending time is 30-40s, and the extrusion pressure is 5.5-7 MPa.
Further, the drawing speed of the transverse drawing machine in the step (c) is 15m/min, the transverse drawing multiple is 18 times, and the curing and shaping temperature is 300-360 ℃; the preheating transverse temperature distribution of the transverse drawing machine is as follows: the side part is 130-200 ℃ and the middle part is 210-280 ℃; the transverse drawing temperature distribution of the transverse drawing machine is as follows: the side 200-.
The invention has the advantages that:
1. according to the invention, the middle part of the blank film is extruded through the olive rolls, so that the middle part is thin, the olive rolls are distributed into an upper row and a lower row, the upper row and the lower row are respectively driven by two motors, the speeds of the two motors are different, the rotating speed of the upper row of olive roll pieces is less than that of the lower row of olive roll pieces, the blank film passing through the olive rolls is gradually stretched through the speed difference of the two rows of olive rolls, the width is gradually expanded, and the problem of uneven stress caused by one-time stretching is solved.
2. The PTFE membrane prepared by the method has good thickness uniformity, high air permeability and high filtration efficiency.
Drawings
FIG. 1 is a schematic structural diagram of a PTFE film transverse stretching uniformity adjusting device of the invention;
fig. 2 is a schematic structural view of a rugby roll in an embodiment of the invention.
The reference numbers illustrate:
1. unwinding rollers; 2. a degreasing box; 3. a positioning roller; 4. a driving roller; 5. an olive roll device; 51. an olive roll piece; 6. flattening rollers; 7. a static eliminating device; 8. and (7) winding the roller.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1, the embodiment discloses a PTFE film transverse stretching uniformity adjusting device, which includes an unwinding roller 1 for winding a blank film, a degreasing box 2 for removing an extrusion aid, a positioning roller 3, a driving roller 4, an olive roller device 5 for extruding the middle part of the blank film, a flattening roller 6 for flattening the extruded blank film, an electrostatic eliminating device 7 for eliminating the static electricity of the blank film, and a winding roller 8 for automatically winding a film, which are sequentially arranged.
As shown in fig. 1, the olive roller device 5 of the present embodiment includes a plurality of olive roller members 51, and as shown in fig. 2, the olive roller members 51 of the present embodiment have a shape of a football in which the diameter is gradually reduced toward both ends in the middle area; the olive roller pieces 51 are regularly arranged up and down, the upper row and the lower row of olive roller pieces 51 in the embodiment are respectively driven by two motors, and the rotating speed of the upper row of olive roller pieces 51 is less than that of the lower row of olive roller pieces 71.
The temperature in the degreasing tank 2 was set as: the degreasing left temperature is controlled to be 150-;
the unreeling speed of the degreasing box 2 is 1.8m/min, the degreasing speed is 1.8m/min, and the drawing speed is 7.8 m/min;
the longitudinal drawing speed of the degreasing box 2 is set as follows: the first drawing speed is 1.8m/min, the second drawing speed is 3m/min, the third drawing speed is 4.6m/min, the fourth drawing speed is 6m/min, and the fifth drawing speed is 7.6 m/min.
The working principle of the embodiment is as follows: the invention provides a PTFE film transverse stretching uniformity adjusting device, which is characterized in that a blank film is placed on an unwinding roller 1, the temperature and the speed in a degreasing box 2 are set to set values, an extrusion aid is removed through the degreasing box 2, the PTFE film is sequentially conveyed to an olive roller device 5 through a positioning roller 3 and a transmission roller 4, the middle part of the PTFE blank film is thinned under the extrusion action of the olive roller device 5, the extruded blank film is flattened through a flattening roller 6, then the static electricity of the blank film is removed through a static electricity eliminating device 7, and finally the PTFE blank film with the thin middle part and the thick two sides is obtained through winding through a winding roller 8.
Example 2
A method for preparing a PTFE membrane comprises the following steps:
(a) mixing PTFE resin with an extrusion aid, and prepressing the mixed PTFE resin material (with the additive amount of the additive being 26%) to obtain a blank film; the prepressing process conditions were set as shown in table 1;
table 1 shows the prepressing conditions
(b) Carrying out secondary calendering on the blank film obtained in the step (a) by adopting a PTFE film transverse stretching uniformity adjusting device in the first embodiment, placing the blank film obtained in the step (a) on an unwinding roller 1, setting the temperature and the speed in a degreasing box 2 to set values, removing an extrusion aid through the degreasing box 2, sequentially passing the PTFE film through a positioning roller 3 and a driving roller 4, conveying the PTFE film to an olive roller device 5, thinning the middle part of the PTFE blank film through the extrusion action of the olive roller device 5, flattening the extruded blank film by using a flattening roller 6, removing the static electricity of the blank film through a static electricity eliminating device 7, and finally winding by using a winding roller 8 to obtain the PTFE blank film with thin middle and thick two sides; the temperature and speed settings in the degreasing tank 2 are shown in table 2;
table 2 shows conditions for setting temperature and speed in the degreasing tank 2
(c) Placing the PTFE blank membrane treated by the PTFE membrane transverse stretching uniformity adjusting device in the step (b) on a unreeling frame of a transverse drawing machine, and adjusting the stretching width, transverse drawing temperature and transverse drawing speed parameters of the transverse drawing machine to obtain a required finished PTFE film; the technological parameters of the transverse drawing machine are shown in table 3;
table 3 shows the process parameters of the horizontal drawing machine
The finished film prepared in this example was subjected to performance testing, and the results are shown in table 10.
Example 3
A method for preparing a PTFE membrane comprises the following steps:
(a) mixing PTFE resin with an extrusion aid, and prepressing the mixed PTFE resin material (with the additive amount of the additive being 26%) to obtain a blank film; the prepressing process conditions were set as shown in table 4;
table 4 shows the prepressing conditions
(b) Carrying out secondary calendering on the blank film obtained in the step (a) by adopting a PTFE film transverse stretching uniformity adjusting device in the first embodiment, placing the blank film obtained in the step (a) on an unwinding roller 1, setting the temperature and the speed in a degreasing box 2 to set values, removing an extrusion aid through the degreasing box 2, sequentially passing the PTFE film through a positioning roller 3 and a driving roller 4, conveying the PTFE film to an olive roller device 5, thinning the middle part of the PTFE blank film through the extrusion action of the olive roller device 5, flattening the extruded blank film by using a flattening roller 6, removing the static electricity of the blank film through a static electricity eliminating device 7, and finally winding by using a winding roller 8 to obtain the PTFE blank film with thin middle and thick two sides; the temperature and speed settings in the degreasing tank 2 are shown in table 5;
table 5 shows the conditions for setting the temperature and speed in the degreasing tank 2
(c) Placing the PTFE blank membrane treated by the PTFE membrane transverse stretching uniformity adjusting device in the step (b) on a unreeling frame of a transverse drawing machine, and adjusting the stretching width, transverse drawing temperature and transverse drawing speed parameters of the transverse drawing machine to obtain a required finished PTFE film; the process parameters of the horizontal drawing machine are shown in table 6;
table 6 shows the process parameters of the drawing machine
| Multiple of horizontal drawing | 18 |
| Horizontal pulling speed (m/min) | 15 |
| Transverse preheat temperature profile/. degree.C | 180 (edge), 260 (middle), 180 (edge) |
| Transverse pull temperature distribution/. degree.C | 220 (edge portion) · 300 (middle portion) · 220 (edge portion) |
| Curing and setting temperature/. degree.C | 310-350 |
The finished film prepared in this example was subjected to performance testing, and the results are shown in table 10.
Example 4
A method for preparing a PTFE membrane comprises the following steps:
(a) mixing PTFE resin with an extrusion aid, and prepressing the mixed PTFE resin material (with the additive amount of the additive being 26%) to obtain a blank film; the prepressing process conditions were set as shown in table 7;
table 7 shows the prepressing process conditions:
(b) carrying out secondary calendering on the blank film obtained in the step (a) by adopting a PTFE film transverse stretching uniformity adjusting device in the first embodiment, placing the blank film obtained in the step (a) on an unwinding roller 1, setting the temperature and the speed in a degreasing box 2 to set values, removing an extrusion aid through the degreasing box 2, sequentially passing the PTFE film through a positioning roller 3 and a driving roller 4, conveying the PTFE film to an olive roller device 5, thinning the middle part of the PTFE blank film through the extrusion action of the olive roller device 5, flattening the extruded blank film by using a flattening roller 6, removing the static electricity of the blank film through a static electricity eliminating device 7, and finally winding by using a winding roller 8 to obtain the PTFE blank film with thin middle and thick two sides; the temperature and speed in the degreasing box 2 are set as the process parameters of the horizontal drawing machine shown in table 8;
table 8 shows the process parameters of the drawing machine
(c) Placing the PTFE blank membrane treated by the PTFE membrane transverse stretching uniformity adjusting device in the step (b) on a unreeling frame of a transverse drawing machine, and adjusting the stretching width, transverse drawing temperature and transverse drawing speed parameters of the transverse drawing machine to obtain a required finished PTFE film; the process parameters of the horizontal drawing machine are shown in table 9;
table 9 shows the process parameters of the drawing machine
The finished film prepared in this example was subjected to performance testing, and the results are shown in table 10.
Comparative example 1
This comparative example differs from example 2 in that: the olive roll treatment was not performed, and other steps and process parameters were the same as those of example 2.
The finished film prepared in this comparative example was subjected to performance test, and the results are shown in table 10.
Comparative example 2
This comparative example differs from example 3 in that: the olive roll treatment was not performed, and other steps and process parameters were the same as those of example 3.
The finished film prepared in this comparative example was subjected to performance test, and the results are shown in table 10.
Comparative example 3
This comparative example differs from example 4 in that: the olive roll treatment was not performed, and other steps and process parameters were the same as those of example 4.
The finished film prepared in this comparative example was subjected to performance test, and the results are shown in table 10.
Table 10 shows the results of performance tests on the finished films of examples 2 to 4 and comparative examples 1 to 3
As can be seen from the results of table 10, the PTFE films obtained in the examples of the present invention have better properties than those of the PTFE films of the three comparative examples, which indicates that the addition of the olive roll 51 can solve the problem that the intermediate portion of the PTFE green film cannot be pulled apart during the transverse drawing process; in example 2, the thickness uniformity was better than that in example 1/3, and the air permeability was higher.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a PTFE membrane transverse stretching homogeneity adjusting device which characterized in that: the device comprises an unwinding roller for winding a blank film, a degreasing box for removing an extrusion aid, a positioning roller, a transmission roller, an olive roller device for extruding the middle part of the blank film, a flattening roller for flattening the extruded blank film, an electrostatic eliminating device for eliminating the static electricity of the blank film and a winding roller for automatically winding a thin film, which are sequentially arranged; the olive roller device comprises a plurality of olive roller pieces, and the olive roller pieces are in a shape of a football with the diameter gradually reduced from the middle area to the two ends; the olive roller pieces are regularly arranged up and down, the upper row and the lower row of the olive roller pieces are respectively driven by two motors, and the rotating speed of the olive roller pieces on the upper row is lower than that of the olive roller pieces on the lower row;
the method comprises the steps of placing a blank film on an unwinding roller, setting the temperature and the speed in a degreasing box to set values, removing an extrusion aid through the degreasing box, conveying the PTFE film to an olive roller device through a positioning roller and a driving roller in sequence, thinning the middle part of the PTFE blank film under the extrusion action of the olive roller device, flattening the extruded blank film by using a flattening roller, removing the static electricity of the blank film through a static electricity eliminating device, and finally winding by using a winding roller to obtain the PTFE blank film with thin middle and thick two sides.
2. The PTFE film transverse stretching uniformity adjusting device of claim 1, wherein: the left degreasing temperature of the degreasing box is controlled to be 150-170 ℃, and the right degreasing temperature is controlled to be 170-190 ℃.
3. The PTFE film transverse stretching uniformity adjusting device of claim 1, wherein: the stretching left temperature of the degreasing box is controlled to be 210-230 ℃, and the stretching right temperature is controlled to be 210-230 ℃.
4. The PTFE film transverse stretching uniformity adjusting device of claim 1, wherein: the unreeling speed of the degreasing box is 1.8 m/min.
5. The PTFE film transverse stretching uniformity adjusting device of claim 1, wherein: the degreasing speed of the degreasing box is 1.8 m/min.
6. The PTFE film transverse stretching uniformity adjusting device of claim 1, wherein: the longitudinal drawing speed of the degreasing box is set as follows: the first drawing speed is 1.8m/min, the second drawing speed is 3m/min, the third drawing speed is 4.6m/min, the fourth drawing speed is 6m/min, and the fifth drawing speed is 7.6 m/min.
7. The PTFE film transverse stretching uniformity adjusting device of claim 1, wherein: the traction speed of the degreasing box is 7.8 m/min.
8. A method for preparing a PTFE membrane is characterized by comprising the following steps:
(a) mixing PTFE resin and an extrusion aid, extruding and prepressing to obtain a blank film;
(b) performing secondary rolling on the PTFE film obtained in the step (a) by using the PTFE film transverse stretching uniformity adjusting device as defined in any one of claims 1 to 7 to obtain a PTFE film blank with a thin middle part and thick two sides;
(c) and (c) placing the PTFE blank membrane treated by the PTFE membrane transverse stretching uniformity adjusting device in the step (b) on a unreeling frame of a transverse drawing machine, and adjusting the stretching width, transverse drawing temperature and transverse drawing speed parameters of the transverse drawing machine to obtain the required finished PTFE membrane.
9. The method for producing a PTFE membrane according to claim 8, wherein: the process conditions of the pre-pressing in the step (a) are set as follows: the water tank temperature is 45-55 ℃, the neck ring mold temperature is 40-50 ℃, the material cylinder temperature is 40-50 ℃, the blank film heat preservation temperature is 30-40 ℃, the upper cylinder descending time is 90-100s, the lower cylinder ascending time is 30-40s, and the extrusion pressure is 5.5-7 MPa.
10. The method for producing a PTFE membrane according to claim 8, wherein: the drawing speed of the transverse drawing machine in the step (c) is 15m/min, the transverse drawing multiple is 18 times, and the curing and shaping temperature is 300-; the preheating transverse temperature distribution of the transverse drawing machine is as follows: the side part is 130-200 ℃ and the middle part is 210-280 ℃; the transverse drawing temperature distribution of the transverse drawing machine is as follows: the side 200-.
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| CN112026156A (en) * | 2019-06-04 | 2020-12-04 | 安徽省众望科希盟科技有限公司 | Method for ensuring uniform transverse thickness of biaxially oriented PTFE (polytetrafluoroethylene) film |
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2021
- 2021-11-18 CN CN202111367464.2A patent/CN114407381A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102303407A (en) * | 2011-09-16 | 2012-01-04 | 中国人民解放军总后勤部军需装备研究所 | Equipment and method for preparing polytetrafluoroethylene (PTFE) membrane by three-dimensional (3D) stretching |
| CN204526131U (en) * | 2015-04-16 | 2015-08-05 | 青岛远东富隆新材料有限公司 | Multistage the indulging of polytetrafluoroethylene (PTFE) draws stretching device |
| CN112026156A (en) * | 2019-06-04 | 2020-12-04 | 安徽省众望科希盟科技有限公司 | Method for ensuring uniform transverse thickness of biaxially oriented PTFE (polytetrafluoroethylene) film |
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