CN106738780A - A kind of e PTFE plunger expressing techniques - Google Patents
A kind of e PTFE plunger expressing techniques Download PDFInfo
- Publication number
- CN106738780A CN106738780A CN201611146627.3A CN201611146627A CN106738780A CN 106738780 A CN106738780 A CN 106738780A CN 201611146627 A CN201611146627 A CN 201611146627A CN 106738780 A CN106738780 A CN 106738780A
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- Prior art keywords
- ptfe
- mould
- plunger
- plungers
- control
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
-
- 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
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/475—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using pistons, accumulators or press rams
-
- 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
- B29C2948/92704—Temperature
-
- 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
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92904—Die; Nozzle zone
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a kind of e PTFE plunger expressing techniques.It includes：Polytetrafluoroethylene (PTFE) paste preform is promoted in the material chamber of extruder barrel by plunger, and tubulose is extruded into by the sizing section of extrusion die port；The compression ratio of plunger extrusion die is controlled 30 50；By the control of die entrance angle at 30 40 °；The length of setting section of mould port is controlled in 20 30mm；By mould-cavity temperature control at 45 65 DEG C.E PTFE plunger expressing techniques of the invention, grope by the process conditions that extrusion profile intensity has considerable influence, it is preferred that going out most suitable process conditions, the e PTFE thus, it is possible to obtain preferable section bar density and mechanical strength are conducive to the later stage processing and forming of e PTFE.
Description
Technical field
The invention belongs to expanded PTFE (e-PTFE) stretched film manufacture technology field, it is related to a kind of e-PTFE plungers
Expressing technique.
Background technology
E-PTFE plunger expressing techniques are the important steps in e-PTFE stretched film manufacture crafts, and pushing device is an important actor
Plug extruder, extrusion is substantially similar to traditional plunger extrusion.As shown in figure 1, the plunger extrusion equipment includes squeezing
Go out machine barrel 2 and extrusion die 4 (mouth mold), machine barrel and mould can be heated respectively, it is ensured that polytetrafluoroethylene (PTFE) paste blank is in setting
At a temperature of be extruded；Polytetrafluoroethylene (PTFE) paste preform is in material chamber 3 by extruding mould under the promotion from top to bottom of plunger 1
The sizing section 5 for having 4 ports is coated on around inner wire by tubular dielectric is extruded into.Due to the cross section size of extrusion die 4
In the cross section (the ratio between extruder barrel cross-sectional area and extrusion die cross-sectional area are referred to as compression ratio) of extruder barrel 2, work as post
Plug can form sufficiently high pressure when promoting preform in die orifice, to ensure the density and mechanical strength of extrudate.
E-PTFE plunger expressing technique conditions have considerable influence to the density and mechanical strength of extrusion profile.Existing e-
PTFE plunger expressing techniques, usually due to compression ratio, inlet angle, length of setting section, the mould-cavity temperature etc. of plunger extrusion neck ring mold
Process regulation is bad so that the e-PTFE section bars density and mechanical strength of plunger extrusion are a greater impact, i.e., section bar is close
Degree and mechanical strength are undesirable, are unfavorable for later stage processing and forming.
The content of the invention
It is an object of the invention to overcome the deficiencies in the prior art, there is provided one kind can obtain preferable section bar density and machinery is strong
Degree, is conducive to the plunger expressing technique of the e-PTFE of later stage processing and forming.
Technical scheme is as follows：
A kind of e-PTFE plungers expressing technique, it includes：Polytetrafluoroethylene (PTFE) paste preform is in the material chamber of extruder barrel
It is interior, promoted by plunger, tubulose is extruded into by the sizing section of extrusion die port；The compression ratio of plunger extrusion neck ring mold is controlled
In 30-50.
Further, the compression ratio of plunger extrusion neck ring mold is controlled in 40-50.
Further, by the control of die entrance angle at 30-40 °.
Further, by the control of die entrance angle at 35-40 °.
Further, the length of setting section of mould port is controlled in 20-30mm.
Further, the length of setting section of mould port is controlled in 20-25mm.
Further, the temperature (i.e. mould-cavity temperature) of mold cavity is controlled at 45-65 DEG C.
Further, the temperature (i.e. mould-cavity temperature) of mold cavity is controlled at 55-60 DEG C.
Beneficial effects of the present invention：
E-PTFE plungers expressing technique of the invention, is carried out by the process conditions for having considerable influence to extrusion profile intensity
Grope, preferably go out most suitable process conditions, the e-PTFE thus, it is possible to obtain preferable section bar density and mechanical strength is conducive to
The later stage processing and forming of e-PTFE.
Brief description of the drawings
Fig. 1 is a kind of structural representation of device therefor in e-PTFE plungers expressing technique.
In figure：1st, plunger 2, extruder barrel 3, material chamber 4, extrusion die 5, sizing section
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further illustrated.
The present invention finds out the most suitable process conditions for having considerable influence to extrusion profile intensity by experiment.
It is the experiment condition and experimental result of embodiment 1-14 the following is several EXPERIMENTAL EXAMPLEs.
Embodiment 1-14
A kind of e-PTFE plungers expressing technique method is as follows：As shown in figure 1, polytetrafluoroethylene (PTFE) paste preform is in extrusion
In the material chamber 3 of machine barrel 2, promoted by plunger 1, tubulose is extruded into by the sizing section 5 of the port of extrusion die 4.
The port mould diameter that the experiment of embodiment 1 is selected is 5mm, and the material a diameter of 50mm in chamber, i.e. compression ratio are 100.Mould is entered
Bicker degree is controlled at 40 °；The length of setting section of mould port is controlled in 25mm；The temperature (i.e. mould-cavity temperature) of mold cavity is controlled
System is at 55 DEG C.
Embodiment 2-14 controls in 30-50 the compression ratio of plunger extrusion neck ring mold；By the control of die entrance angle in 30-
50°；The length of setting section of mould port is controlled in 15-30mm；The temperature (i.e. mould-cavity temperature) of mold cavity is controlled in 45-65
℃。
The experiment condition and experimental result of embodiment 1-14
| Sequence number | Compression ratio | Inlet angle | Length of setting section | Mould-cavity temperature | Extrudate tensile strength |
| 1 | 100 | 40° | 25mm | 55℃ | 0.024MPa |
| 2 | 50 | 40° | 25mm | 55℃ | 0.035MPa |
| 3 | 40 | 40° | 25mm | 55℃ | 0.035MPa |
| 4 | 30 | 40° | 25mm | 55℃ | 0.034MPa |
| 5 | 50 | 35° | 25mm | 55℃ | 0.035MPa |
| 6 | 50 | 30° | 25mm | 55℃ | 0.033MPa |
| 7 | 50 | 50° | 25mm | 55℃ | 0.029MPa |
| 8 | 50 | 40° | 25mm | 45℃ | 0.033MPa |
| 9 | 50 | 40° | 25mm | 50℃ | 0.034MPa |
| 10 | 50 | 40° | 25mm | 60℃ | 0.035MPa |
| 11 | 50 | 40° | 25mm | 65℃ | 0.034MPa |
| 12 | 50 | 40° | 15mm | 55℃ | 0.027MPa |
| 13 | 50 | 40° | 20mm | 55℃ | 0.035MPa |
| 14 | 50 | 40° | 30mm | 55℃ | 0.033MPa |
Extrudate tensile strength is bigger, and the fento shape crystal that expression is internally formed orientation is more regular, is more conducive to the later stage
Calendering procedure, is conducive to film forming.Be can be seen that from the experimental result of upper table：
(1) in the feelings of other condition (40 ° of die entrance angle, length of setting section 25mm, 55 DEG C of mould-cavity temperature) all sames
Under condition：When dies compress ratio is 100, extrudate tensile strength only has 0.024MPa to embodiment 1；Embodiment 2 works as dies compress
Than for 50 when, embodiment 3 when dies compress ratio is 40, embodiment 4 when dies compress ratio is 30, extrudate tensile strength point
Da not 0.035MPa, 0.035MPa and 0.034MPa.As can be seen here, by dies compress than controlling in 30-50, extrudate stretching
Intensity is significantly improved, (especially compression ratio in 40-50, extrudate tensile strength highest), is more beneficial for the calendering procedure in later stage,
It is more beneficial for film forming.
(2) in the feelings of other condition (dies compress ratio is 50, length of setting section 25mm, 55 DEG C of mould-cavity temperature) all sames
Under condition：When 50 ° of die entrance angle, extrudate tensile strength only has 0.029MPa to embodiment 7；Embodiment 2 works as die entrance
During 40 ° of angle, when 35 ° of die entrance angle, embodiment 6 is when 30 ° of die entrance angle, and extrudate stretching is strong for embodiment 5
Degree reaches 0.035MPa, 0.035MPa and 0.033MPa respectively.As can be seen here, the control of die entrance angle is squeezed at 30-40 °
Go out thing tensile strength to significantly improve, (especially die entrance angle at 35-40 °, extrudate tensile strength highest) is more beneficial for
The calendering procedure in later stage, is more beneficial for film forming.
(3) in other condition (dies compress ratio is 50,40 ° of die entrance angle, length of setting section 25mm) all sames
In the case of：When 45 DEG C of mould-cavity temperature, when 50 DEG C of mould-cavity temperature, embodiment 2 works as 55 DEG C of mould-cavity temperature to embodiment 9 to embodiment 8
When, when 60 DEG C of mould-cavity temperature, when 65 DEG C of mould-cavity temperature, extrudate tensile strength is respectively embodiment 11 embodiment 10
0.033MPa, 0.034MPa, 0.035MPa, 0.035MPa and 0.034MPa.As can be seen here, by mould-cavity temperature control in 45-65
DEG C when, extrudate tensile strength is significantly improved, (especially mould-cavity temperature at 55-60 DEG C, extrudate tensile strength highest), is more had
Beneficial to the calendering procedure in later stage, film forming is more beneficial for.
(4) it is homogeneous in other conditions (dies compress ratio is 50,40 ° of die entrance angle, mould-cavity temperature control at 55 DEG C)
In the case of：As length of setting section 15mm, extrudate tensile strength only has 0.027MPa to embodiment 12；Embodiment 13 is when fixed
During type segment length 20mm, as length of setting section 25mm, as length of setting section 30mm, extrudate draws embodiment 14 embodiment 2
Stretch intensity respectively 0.035MPa, 0.035MPa and 0.033MPa.As can be seen here, by length of setting section control in 20-30mm,
Extrudate tensile strength is significantly improved, (especially length of setting section in 20-25mm, extrudate tensile strength highest), more favorably
In the calendering procedure in later stage, film forming is more beneficial for.
It follows that a kind of preferred e-PTFE plungers expressing technique of the present invention is as follows：Polytetrafluoroethylene (PTFE) paste prefabricated blank
Material is promoted in the material chamber of extruder barrel by plunger, and tubulose is extruded into by the sizing section of extrusion die port；Plunger is squeezed
The compression ratio of outlet mold is controlled in 30-50；By the control of die entrance angle at 30-40 °；By the length of setting section control of mould port
System is in 20-30mm；The temperature (i.e. mould-cavity temperature) of mold cavity is controlled at 45-65 DEG C.
Further Optimizing Technical of the invention is：The compression ratio of plunger extrusion neck ring mold is controlled in 40-50；By mould
Tool inlet angle control is at 35-40 °；The length of setting section of mould port is controlled in 20-25mm；By the temperature of mold cavity (i.e.
Mould-cavity temperature) control at 55-60 DEG C.
Theory analysis and explanation：
(1) influence for compressing when die size of mould
The compression ratio of mould, be defined as the ratio between material chamber sectional area and mouth mold sectional area (i.e. extruder barrel cross-sectional area with squeeze
Go out the ratio between mould cross-sectional area).The compression of extrusion die is the key factor for influenceing microfibre to be formed.Inlet angle θ is respectively
10 °, 20 °, 45 ° of circular mouth mold with different compression ratios, deformation process during Solid state extrusion, discovery can be divided into two stages：
When compression ratio≤60, deformation is mainly unbodied entangled molecule chain and is straightened and along extrusion direction orientation, crystalline region strand
Elastic deformation can only then occur because being limited by crystal, or the motion of small range is produced in crystalline region；Work as compression ratio>60
When, deform and occur mainly in crystal region, including interchain sliding and the extraction of connection molecule chain, and the fento shape crystalline substance for forming orientation
Body.
Polyflon can provide a processing compression ratio for recommendation when dispatching from the factory, be processed under the compression ratio recommended,
PTFE fibre-forming performances are best.Therefore, preferably from the mould extrusion that dies compress is more suitable than with resin compression ratio, if dies compress
Than less than resin compression ratio, being then extruded into fine deficiency, extrudate intensity is small, it is impossible to further stretching.If dies compress ratio is more than
Resin compression ratio, then extrusion pressure is too big, causes extrusion difficult, extrudate rough surface.
Port mould diameter and the selection that the selection reality of material chamber diameter is exactly product compression ratio during pushing.According to testing
Know, under the premise of other condition identicals, product compression ratio is bigger, and the packing of product is higher, and physical property is better；Instead
It, the packing of product is just smaller, and physical property is poorer.But product compression ratio is excessive, then can cause to push difficulty, not even
(extrusion) can be pushed.Therefore, it is the compression ratio control of plunger extrusion neck ring mold is most suitable in 40-50.
(2) influence of the die entrance angle to extrudate intensity：
Extrudate intensity first increases to be reduced afterwards.From the flow mechanism of paste, with the increase of die entrance angle, θ,
Resin particle is subject to " pulling force " of radial direction bigger therefore better into fine effect, however, continue to increase inlet angle, then due to extrusion
Pressure increases rapidly, and the microfibre that oneself forms is broken, and causes extrudate intensity to have decline.Therefore, by die entrance angle
Degree control is most suitable at 35-40 °.
(3) the shadow noon of section of shaping:
The shadow noon of section of shaping, i.e. influence of the draw ratio in thin footpath area to the tensile strength of dry and unsintered extrudate.
The initial tensile strength of extrudate increases and increases with thin footpath area draw ratio, when draw ratio exceedes certain value (i.e. dies compress ratio
During for 40-50, length of setting section is 20-25mm.In the case where the compression ratio of mould is certain, because the diameter of extruder barrel is consolidated
It is fixed constant, therefore the diameter of mould port sizing section is also certain) after, tensile strength declines on the contrary.Because major diameter
When smaller, extrudate outlet bulking effect is serious, and during increase draw ratio, the fiber formed in extrusion is fully loose along extrusion direction
Relax and be orientated, when continuing to increase draw ratio, due to extrusion resistance increase so that few fibers are broken, and intensity declines on the contrary.Cause
This, the draw ratio in thin footpath area at certain value (when i.e. dies compress ratio is 40-50, length of setting section is 20-25mm), extrudate
Maximum intensity.
The draw ratio in thin footpath area also has similar influence to extrudate intensity after sintering, but much weaker is wanted in this influence, and this is
Because after sintered, fiber substantially disappears in extrudate, therefore, thin footpath head of district footpath compares extrudate tensile strength shadow after sintering
Ring little.
Claims (8)
1. a kind of e-PTFE plungers expressing technique, it is characterised in that it includes：Polytetrafluoroethylene (PTFE) paste preform is in extruder
In the material chamber of cylinder, promoted by plunger, tubulose is extruded into by the sizing section of mould port；By the compression ratio of plunger extrusion neck ring mold
Control is in 30-50.
2. e-PTFE plungers expressing technique as claimed in claim 1, it is characterised in that by the compression ratio control of plunger extrusion neck ring mold
System is in 40-50.
3. e-PTFE plungers expressing technique as claimed in claim 1 or 2, it is characterised in that the control of die entrance angle exists
30-40°。
4. e-PTFE plungers expressing technique as claimed in claim 3, it is characterised in that by the control of die entrance angle in 35-
40°。
5. e-PTFE plungers expressing technique as claimed in claim 1 or 2, it is characterised in that by the sizing segment length of mould port
Degree control is in 20-30mm.
6. e-PTFE plungers expressing technique as claimed in claim 5, it is characterised in that by the length of setting section control of mould port
System is in 20-25mm.
7. e-PTFE plungers expressing technique as claimed in claim 1 or 2, it is characterised in that by mould-cavity temperature control in 45-65
℃。
8. e-PTFE plungers expressing technique as claimed in claim 7, it is characterised in that by mould-cavity temperature control at 55-60 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611146627.3A CN106738780B (en) | 2016-12-13 | 2016-12-13 | A kind of e-PTFE plunger extrusion process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611146627.3A CN106738780B (en) | 2016-12-13 | 2016-12-13 | A kind of e-PTFE plunger extrusion process |
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| Publication Number | Publication Date |
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| CN106738780A true CN106738780A (en) | 2017-05-31 |
| CN106738780B CN106738780B (en) | 2019-02-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110480975A (en) * | 2019-07-25 | 2019-11-22 | 青岛大学 | A kind of full-automatic plunger type PTFE strip extruder of efficient stable |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101007242A (en) * | 2006-12-27 | 2007-08-01 | 中材科技股份有限公司 | Preparation method of expanding microporous poly tetrafluoroethylene |
| CN103055721A (en) * | 2013-01-30 | 2013-04-24 | 四川大学 | Preparation method for high-flux high-strength polytetrafluoroethylene hollow fibrous membrane |
| CN103101195A (en) * | 2013-01-18 | 2013-05-15 | 浙江国泰密封材料股份有限公司 | Preparation method of PTFE (Poly Tetra Fluoro Ethylene) film for flexible sealing board |
-
2016
- 2016-12-13 CN CN201611146627.3A patent/CN106738780B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101007242A (en) * | 2006-12-27 | 2007-08-01 | 中材科技股份有限公司 | Preparation method of expanding microporous poly tetrafluoroethylene |
| CN103101195A (en) * | 2013-01-18 | 2013-05-15 | 浙江国泰密封材料股份有限公司 | Preparation method of PTFE (Poly Tetra Fluoro Ethylene) film for flexible sealing board |
| CN103055721A (en) * | 2013-01-30 | 2013-04-24 | 四川大学 | Preparation method for high-flux high-strength polytetrafluoroethylene hollow fibrous membrane |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110480975A (en) * | 2019-07-25 | 2019-11-22 | 青岛大学 | A kind of full-automatic plunger type PTFE strip extruder of efficient stable |
| CN110480975B (en) * | 2019-07-25 | 2021-02-23 | 青岛大学 | Efficient and stable full-automatic plunger type PTFE (Polytetrafluoroethylene) strip extruder |
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| CN106738780B (en) | 2019-02-22 |
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