CN109603581A - A kind of polytetrafluoroethylhollow hollow fiber membrane biaxial tension mold - Google Patents
A kind of polytetrafluoroethylhollow hollow fiber membrane biaxial tension mold Download PDFInfo
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- CN109603581A CN109603581A CN201811625640.6A CN201811625640A CN109603581A CN 109603581 A CN109603581 A CN 109603581A CN 201811625640 A CN201811625640 A CN 201811625640A CN 109603581 A CN109603581 A CN 109603581A
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- Prior art keywords
- external mold
- core model
- expansion
- hole
- diameter
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/30—Polyalkenyl halides
- B01D71/32—Polyalkenyl halides containing fluorine atoms
- B01D71/36—Polytetrafluoroethene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0002—Organic membrane manufacture
- B01D67/0009—Organic membrane manufacture by phase separation, sol-gel transition, evaporation or solvent quenching
- B01D67/0013—Casting processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/08—Hollow fibre membranes
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
A kind of polytetrafluoroethylhollow hollow fiber membrane biaxial tension mold comprising external mold, core model, expansion external mold, expansion core model；The inside of external mold digs the external mold through-hole that front and back penetrates through；Core model is fixed in the external mold through-hole of external mold；A longitudinal stretching channel that back segment is wide and leading portion is narrow is formed between external mold, core model；Expansion external mold is mounted on the front end of external mold；The inside of expansion external mold digs the expansion external mold through-hole that front and back penetrates through；Expansion core model is mounted on the front end of core model；Expansion core model is fixed in the expansion external mold through-hole of expansion external mold；It expands and forms the constant biaxial tension channel in length and breadth of a width between external mold, expansion core model；Longitudinal stretching channel is connected to biaxial tension channel in length and breadth.The present invention stretches polytetrafluoroethylhollow hollow fiber membrane along horizontal and vertical both direction, so as to be simple and efficient to obtain the polytetrafluoroethylhollow hollow fiber membrane with smaller hole Jing ﹑ high porosity.
Description
Technical field
The present invention relates to a kind of hollow-fibre membrane drawing dies, double more particularly to a kind of polytetrafluoroethylhollow hollow fiber membrane
To drawing die.
Background technique
Hollow-fibre membrane is largely adopted in the UF membranes such as reverse osmosis, ultrafiltration, micro-filtration, membrane contactor and membrane reactor field
With.Common Hollow-fibre membranes material includes cellulose acetate, polyvinyl chloride, polypropylene, polyethylene, polyacrylonitrile, polysulfones, gathers
Ether sulfone, Kynoar etc..Different applications proposes different requirements to hollow-fibre membrane, including membrane aperture,
The requirement of porosity, mechanical property, corrosion resistance etc..
Polytetrafluoroethylene (PTFE) has the good characteristics such as extremely strong acid and alkali-resistance, resistance to oxidation, resistance to microbial attack, high-low temperature resistant, gathers
Tetrafluoroethene hollow-fibre membrane is other than the good characteristic with polytetrafluoroethylene (PTFE) itself, also big excellent of high, flux with intensity
Point has important application value in the fields such as extraordinary filtering, membrane contactor, membrane reactor.
A kind of processing method of polytetrafluoroethylhollow hollow fiber membrane is: polyflon is used, in lubricant
Lower progress is paste-extruded, obtains polytetrafluoroethylene (PTFE) pipe, is obtained hollow by stretching and being sintered again after removing lubricant (degreasing)
With the polytetrafluoroethylhollow hollow fiber membrane of micropore on fibre wall.Stretching step be realize micropore generate, pore size control and
The key link of hollow fiber film structure control, report and patent in this respect are few.
For squeezing out link, pushing machine extrusion is usually used in polytetrafluoroethylene (PTFE) pipe, and pushing against mold is by cone mould, mouth mold
It is formed with core model.In actual use, core model is generally 1~3 millimeter longer than mouth mold lower end.One pushing against mold of apparatus above
Squeeze out a root canal base.A kind of No. .1 expanded polytetrafluoroethyltube tube extrusion molding die of Chinese patent ZL201010185858, it is open
The device of more root canal bases is squeezed out simultaneously.
For stretching link, disclosed patent includes that a kind of polytetrafluoro is given in United States Patent (USP) US4250138 both at home and abroad
Ethylene hollow fiber stretching device, which uses similar seamless metal pipe stretching device, using the side of circular hole mould and plug
Formula realizes the stretching of polytetrafluoroethylene (PTFE).
A kind of use fluting hot-rolling stretching device is given in United States Patent (USP) US4496507, uses heating roller in the device
Cylinder carries out temperature control, and piece doughnut of one-off drawing easily occurs doughnut rupture in drawing process, doughnut collapses
The problems such as.
A kind of No. .2 polytetrafluoroethylhollow hollow fiber stretching device of Chinese patent ZL201010508798, discloses one kind
The degreasing be made of deflector roll, draw roll and chill roll and stretching device.
A kind of Chinese patent ZL201010504784 .3 method for controlling aperture of polytetrafluoroethylhollow hollow fiber membrane, it is public
It has opened and a kind of has used aqueous dispersion type fluorinated dispersion concentration liquid coating polytetrafluoroethylhollow hollow fiber membrane surface to control aperture.
In summary, during stretching use more complicated device to polytetrafluoroethylhollow hollow fiber membrane into
Row stretches, and whether uses which kind of stretching device and means, is longitudinal stretching, i.e., is pulled up along pipe length side.
Summary of the invention
The technical problem to be solved in the present invention is that: a kind of polytetrafluoroethylhollow hollow fiber membrane biaxial tension mold is provided,
Horizontal and vertical biaxial tension is realized in such a way that auxiliary mould squeezes expansion, so as to be simple and efficient to obtain with smaller
The polytetrafluoroethylhollow hollow fiber membrane of Kong Jing ﹑ high porosity.
In order to solve the above-mentioned technical problem, the present invention proposes a kind of following technical scheme: polytetrafluoroethylhollow hollow fiber membrane
Biaxial tension mold comprising external mold, core model, expansion external mold, expansion core model；
The inside of external mold digs the external mold through-hole that front and back penetrates through；
External mold through-hole includes external mold through-hole back segment interconnected from back to front, external mold through-hole leading portion；
External mold through-hole back segment is truncated cone-shaped, and diameter is from back to front gradually from large to small；
External mold through-hole leading portion is that cylindrical and diameter is constant；
Core model is fixed in the external mold through-hole of external mold；
Core model includes the core model back segment being sequentially connected from back to front, core model leading portion；
Core model back segment is truncated cone-shaped, and diameter is from back to front gradually from large to small；
Core model leading portion is that cylindrical and its diameter is constant；
A longitudinal stretching channel that back segment is wide and leading portion is narrow is formed between external mold, core model；
Expansion external mold is mounted on the front end of external mold；
The inside of expansion external mold digs the expansion external mold through-hole that front and back penetrates through；
Expansion external mold through-hole includes expansion external mold through-hole back segment interconnected from back to front, expansion external mold through-hole middle section, expansion
External mold through-hole leading portion；
Expansion external mold through-hole back segment and expansion external mold through-hole leading portion are all that cylindrical and diameter is all constant；
The diameter for expanding external mold through-hole back segment is equal to the diameter of external mold through-hole leading portion；
The diameter for expanding external mold through-hole leading portion is bigger than the diameter for expanding external mold through-hole back segment；
Expanding external mold through-hole middle section is truncated cone-shaped, and diameter gradually changes from small to big from back to front；
Expansion core model is mounted on the front end of core model；
Expansion core model is fixed in the expansion external mold through-hole of expansion external mold；
Expansion core model includes the expansion core model back segment being sequentially connected from back to front, expansion core model middle section, expansion core model leading portion；
Expansion core model back segment and expansion core model leading portion are all that cylindrical and diameter is all constant；
The diameter for expanding core model back segment is equal to the diameter of core model leading portion；
The diameter for expanding core model leading portion is bigger than the diameter for expanding core model back segment；
Expanding core model middle section is truncated cone-shaped, and diameter gradually changes from small to big from back to front；
It expands and forms the constant biaxial tension channel in length and breadth of a width between external mold, expansion core model；
Longitudinal stretching channel is connected to biaxial tension channel in length and breadth.
The above technical solution is further limited in that before the mode being threadedly coupled other than expansion external mold is mounted on external mold
End.
The above technical solution is further limited in that before the mode being threadedly coupled within expansion core model is mounted on core model
End.
The above technical solution is further limited in that the diameter of expansion external mold through-hole leading portion is more straight than external mold through-hole leading portion
Diameter is big by 10%~200%.
The above technical solution is further limited in that the diameter of expansion core model leading portion is bigger than the diameter of core model leading portion by 10%
~200%.
Compared with prior art, the present invention have it is following the utility model has the advantages that polytetrafluoroethylhollow hollow fiber membrane first flow through external mold,
The longitudinal stretching channel that the back segment formed between core model is wide and leading portion is narrow, from large to small due to cross section of fluid channel product, to polytetrafluoroethyl-ne
Alkene hollow-fibre membrane carries out compression extruding, realizes the longitudinal stretching to polytetrafluoroethylhollow hollow fiber membrane；Then, polytetrafluoroethylene (PTFE)
Hollow-fibre membrane flows through the constant biaxial tension channel in length and breadth of the width formed between expansion external mold, expansion core model, due to tapered
Expanding extruding realizes the cross directional stretch to polytetrafluoroethylhollow hollow fiber membrane.So as to be simple and efficient to obtain with smaller hole Jing ﹑
The polytetrafluoroethylhollow hollow fiber membrane of high porosity.
Detailed description of the invention
Fig. 1 is the perspective view of polytetrafluoroethylhollow hollow fiber membrane biaxial tension mold of the present invention.
Fig. 2 is the left view of polytetrafluoroethylhollow hollow fiber membrane biaxial tension mold of the present invention.
Fig. 3 is the cross-sectional view in the direction A-A in Fig. 2.
Specific embodiment
Please refer to Fig.1 to Fig.3, a kind of polytetrafluoroethylhollow hollow fiber membrane biaxial tension mold, including external mold 1, core model 2,
Expand external mold 3, expansion core model 4.
External mold 1 and core model 2 are fixed on pushing equipment (not shown) outlet end.
The inside of external mold 1 digs the external mold through-hole 12 that front and back penetrates through.
External mold through-hole 12 includes external mold through-hole back segment 122 interconnected from back to front, external mold through-hole leading portion 124.
External mold through-hole back segment 122 is truncated cone-shaped, and diameter is from back to front gradually from large to small.
External mold through-hole leading portion 124 is that cylindrical and diameter is constant.
Core model 2 is fixed in the external mold through-hole 12 of external mold 1.
Core model 2 includes core model back segment 22, the core model leading portion 24 being sequentially connected from back to front.
Core model back segment 22 is truncated cone-shaped, and diameter is from back to front gradually from large to small.
Core model leading portion 24 is that cylindrical and its diameter is constant.
A longitudinal stretching channel (not labeled) that back segment is wide and leading portion is narrow is formed between external mold 1, core model 2.
The mode being threadedly coupled other than expansion external mold 3 is mounted on the front end of external mold 1.
The inside of expansion external mold 3 digs the expansion external mold through-hole 32 that front and back penetrates through.
Expanding external mold through-hole 32 includes expansion external mold through-hole back segment 322 interconnected from back to front, expansion external mold through-hole
Middle section 324, expansion external mold through-hole leading portion 326.
Expansion external mold through-hole back segment 322 and expansion external mold through-hole leading portion 326 are all that cylindrical and diameter is all constant.
The diameter for expanding external mold through-hole back segment 322 is equal to the diameter of external mold through-hole leading portion 124.
The diameter for expanding external mold through-hole leading portion 326 is bigger by 10%~200% than the diameter for expanding external mold through-hole back segment 322, also
It is to say, the diameter for expanding external mold through-hole leading portion 326 is bigger by 10%~200% than the diameter of external mold through-hole leading portion 124.
Expanding external mold through-hole middle section 324 is truncated cone-shaped, and diameter gradually changes from small to big from back to front.
The mode being threadedly coupled within expansion core model 4 is mounted on the front end of core model 2.
Expansion core model 4 is fixed in the expansion external mold through-hole 32 of expansion external mold 3.
Expansion core model 4 includes the expansion core model back segment 42 being sequentially connected from back to front, expansion core model middle section 44, expansion core model
Leading portion 46.
Expansion core model back segment 42 and expansion core model leading portion 46 are all that cylindrical and diameter is all constant.
The diameter for expanding core model back segment 42 is equal to the diameter of core model leading portion 24.
The diameter for expanding core model leading portion 46 is bigger by 10%~200% than the diameter for expanding core model back segment 42, that is to say, that expansion core
The diameter of mould leading portion 46 is bigger than the diameter of core model leading portion 24 by 10%~200%.
Expanding core model middle section 44 is truncated cone-shaped, and diameter gradually changes from small to big from back to front.
It expands and forms the constant channel of the biaxial tension in length and breadth (not labeled) of a width between external mold 3, expansion core model 4.
Longitudinal stretching channel is connected to biaxial tension channel in length and breadth, drawing when passing through for polytetrafluoroethylhollow hollow fiber membrane
It stretches.
The present invention has following the utility model has the advantages that polytetrafluoroethylhollow hollow fiber membrane first flows through is formed between external mold 1, core model 2
Back segment is wide and longitudinal stretching channel that leading portion is narrow, from large to small due to cross section of fluid channel product, to polytetrafluoroethylhollow hollow fiber membrane
Compression extruding is carried out, realizes the longitudinal stretching to polytetrafluoroethylhollow hollow fiber membrane；Then, polytetrafluoroethylhollow hollow fiber membrane stream
The constant biaxial tension channel in length and breadth of the width formed between stretched external mold 3, expansion core model 4, it is real due to tapered expanding extruding
Now to the cross directional stretch of polytetrafluoroethylhollow hollow fiber membrane.There is smaller hole Jing ﹑ high porosity so as to be simple and efficient to obtain
Polytetrafluoroethylhollow hollow fiber membrane.
Claims (5)
1. a kind of polytetrafluoroethylhollow hollow fiber membrane biaxial tension mold, which is characterized in that outside it includes external mold, core model, expands
Mould, expansion core model；
The inside of external mold digs the external mold through-hole that front and back penetrates through；
External mold through-hole includes external mold through-hole back segment interconnected from back to front, external mold through-hole leading portion；
External mold through-hole back segment is truncated cone-shaped, and diameter is from back to front gradually from large to small；
External mold through-hole leading portion is that cylindrical and diameter is constant；
Core model is fixed in the external mold through-hole of external mold；
Core model includes the core model back segment being sequentially connected from back to front, core model leading portion；
Core model back segment is truncated cone-shaped, and diameter is from back to front gradually from large to small；
Core model leading portion is that cylindrical and its diameter is constant；
A longitudinal stretching channel that back segment is wide and leading portion is narrow is formed between external mold, core model；
Expansion external mold is mounted on the front end of external mold；
The inside of expansion external mold digs the expansion external mold through-hole that front and back penetrates through；
Expansion external mold through-hole includes expansion external mold through-hole back segment interconnected from back to front, expansion external mold through-hole middle section, expansion
External mold through-hole leading portion；
Expansion external mold through-hole back segment and expansion external mold through-hole leading portion are all that cylindrical and diameter is all constant；
The diameter for expanding external mold through-hole back segment is equal to the diameter of external mold through-hole leading portion；
The diameter for expanding external mold through-hole leading portion is bigger than the diameter for expanding external mold through-hole back segment；
Expanding external mold through-hole middle section is truncated cone-shaped, and diameter gradually changes from small to big from back to front；
Expansion core model is mounted on the front end of core model；
Expansion core model is fixed in the expansion external mold through-hole of expansion external mold；
Expansion core model includes the expansion core model back segment being sequentially connected from back to front, expansion core model middle section, expansion core model leading portion；
Expansion core model back segment and expansion core model leading portion are all that cylindrical and diameter is all constant；
The diameter for expanding core model back segment is equal to the diameter of core model leading portion；
The diameter for expanding core model leading portion is bigger than the diameter for expanding core model back segment；
Expanding core model middle section is truncated cone-shaped, and diameter gradually changes from small to big from back to front；
It expands and forms the constant biaxial tension channel in length and breadth of a width between external mold, expansion core model；
Longitudinal stretching channel is connected to biaxial tension channel in length and breadth.
2. a kind of polytetrafluoroethylhollow hollow fiber membrane biaxial tension mold according to claim 1, which is characterized in that expansion
The mode being threadedly coupled other than external mold is mounted on the front end of external mold.
3. a kind of polytetrafluoroethylhollow hollow fiber membrane biaxial tension mold according to claim 1, which is characterized in that expansion
The mode being threadedly coupled within core model is mounted on the front end of core model.
4. a kind of polytetrafluoroethylhollow hollow fiber membrane biaxial tension mold according to claim 1, which is characterized in that expansion
The diameter of external mold through-hole leading portion is bigger by 10%~200% than the diameter of external mold through-hole leading portion.
5. a kind of polytetrafluoroethylhollow hollow fiber membrane biaxial tension mold according to claim 1, which is characterized in that expansion
The diameter of core model leading portion is bigger than the diameter of core model leading portion by 10%~200%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811625640.6A CN109603581A (en) | 2018-12-28 | 2018-12-28 | A kind of polytetrafluoroethylhollow hollow fiber membrane biaxial tension mold |
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| CN201811625640.6A CN109603581A (en) | 2018-12-28 | 2018-12-28 | A kind of polytetrafluoroethylhollow hollow fiber membrane biaxial tension mold |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117140933A (en) * | 2023-10-27 | 2023-12-01 | 江苏美能膜材料科技有限公司 | Processing equipment for hollow fiber membrane production |
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