CN107984668A - It is used to prepare the re-entrant trough profiled steel sheeting and calendering process of polytetrafluoroethyltwo two-way stretch film - Google Patents
It is used to prepare the re-entrant trough profiled steel sheeting and calendering process of polytetrafluoroethyltwo two-way stretch film Download PDFInfo
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- CN107984668A CN107984668A CN201711488662.8A CN201711488662A CN107984668A CN 107984668 A CN107984668 A CN 107984668A CN 201711488662 A CN201711488662 A CN 201711488662A CN 107984668 A CN107984668 A CN 107984668A
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- transition
- calender
- transition roller
- stack
- embryo material
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- 238000003490 calendering Methods 0.000 title claims abstract description 62
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 24
- 239000010959 steel Substances 0.000 title claims abstract description 24
- 229920006302 stretch film Polymers 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title claims description 13
- 230000008569 process Effects 0.000 title claims description 10
- 230000007704 transition Effects 0.000 claims abstract description 124
- 239000000463 material Substances 0.000 claims description 109
- 210000001161 mammalian embryo Anatomy 0.000 claims description 108
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000012545 processing Methods 0.000 abstract description 8
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 31
- 239000004810 polytetrafluoroethylene Substances 0.000 description 31
- -1 polytetrafluoroethylene Polymers 0.000 description 29
- 238000012360 testing method Methods 0.000 description 12
- DCAYPVUWAIABOU-UHFFFAOYSA-N hexadecane Chemical compound CCCCCCCCCCCCCCCC DCAYPVUWAIABOU-UHFFFAOYSA-N 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 241000446313 Lamella Species 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000994 depressogenic effect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000007759 kiss coating Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/44—Compression means for making articles of indefinite length
- B29C43/46—Rollers
-
- 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
- B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
- B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
- B29C55/14—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively
- B29C55/143—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively firstly parallel to the direction of feed and then transversely thereto
-
- 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
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/44—Compression means for making articles of indefinite length
- B29C43/46—Rollers
- B29C2043/466—Rollers the rollers having specific shape, e.g. non cylindrical rollers, conical rollers
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The present invention provides a kind of re-entrant trough profiled steel sheeting for being used to prepare polytetrafluoroethyltwo two-way stretch film, including：First calender and the second calender, first calender includes the first housing and two the first stacks, second calender includes the second housing and two the second stacks, the both ends of first stack are connected to the first housing, diameter in the middle part of first stack is more than the diameter at the first stack both ends, the middle part of first stack is arc-shaped structure, and first stack middle part and the first stack both ends between be arc-shaped transition connection, the both ends of second stack are equal with the diameter at middle part, minimum range in calendering between two the first stacks is more than the minimum range between two the second stacks.Processing quality can be improved provided by the present invention for the re-entrant trough profiled steel sheeting and calendering process for preparing polytetrafluoroethyltwo two-way stretch film.
Description
Technical field
The invention belongs to the processing technique field of polytetrafluoroethylene film, is related to and is used to prepare polytetrafluoroethyltwo two-way stretch film
Re-entrant trough profiled steel sheeting and calendering process.
Background technology
Calender is by two or more rollers, is arranged by certain forms, at a certain temperature, by rubber or modeling
Material compacting extension can carry out fiber curtain canvas or wirecord fabric in the machine of kiss-coating into certain thickness and the film of surface configuration
Tool.
In the production process of polytetrafluoroethylene film, it is also desirable to polytetrafluoroethylene film is processed using to calender.
The calender for being wherein used for polytetrafluoroethylene film processing has generally included two rollers, i.e. the first stack and the second stack,
First stack is located at the surface of the second stack, therebetween with a certain distance, when for making polytetrafluoroethylene (PTFE)
When the columnar embryo material of film is by between the first stack and the second stack, due to the first stack and the second stack
Between spacing be fixed, so when embryo material is by between the first stack and the second stack, embryo material just occurs
Deformation simultaneously forms certain thickness lamellar structure, carries out longitudinal stretching again by the lamellar structure after calender and laterally draws
Stretch, so as to be formed with certain thickness polytetrafluoroethylene film, wherein longitudinal stretching is the length direction of polytetrafluoroethylene film.But
Be the first stack and the second stack when suppressing embryo material, the mid portion positioned at column embryo material has concentrated phase
To more embryo material, but after embryo material is by the first stack and the second stack, all embryo materials all have identical
Thickness, so has led to the density that the density in the middle part of embryo material lamella is more than lamella both sides, so in follow-up longitudinal stretching and horizontal stroke
To after stretching, it will cause the Density Distribution inequality of polytetrafluoroethylene film machined, processing quality is low.
The content of the invention
It is an object of the invention to provide the re-entrant trough profiled steel sheeting and calendering process for being used to prepare polytetrafluoroethyltwo two-way stretch film,
Aim to solve the problem that the problem of processing quality is low.
In order to solve the above technical problems, the present invention provides a kind of calendering for being used to prepare polytetrafluoroethyltwo two-way stretch film
Unit, including：First calender and the second calender, first calender and second calender are used for successively to embryo
Material is rolled, and first calender includes the first housing and in being symmetrical arranged up and down, and is rotationally connected with described the
Two the first stacks of one body, second calender includes the second housing and in being symmetrical arranged up and down, and the company of rotation
Two the second stacks of the second housing are connected to, the both ends of first stack are connected to the first housing, described
Diameter in the middle part of first stack is more than the diameter at the first stack both ends, and the middle part of first stack is arc-shaped
Structure, and be that arc-shaped transition connects between the middle part of first stack and the first stack both ends, described second
The both ends of stack are equal with the diameter at middle part, and the minimum range in calendering between two first stacks is more than two
Minimum range between second stack.
The present invention is further arranged to, and the minimum range in calendering between two first stacks is 100-1000
Micron.
The present invention is further arranged to, and the minimum range in calendering between two second stacks is micro- for 50-500
Rice.
The present invention is further arranged to, and has further included transition apparatus, the transition apparatus be located at first calender and
Between second calender, the embryo material for being pointed between first calender and second calender is propped up
Support.
The present invention is further arranged to, and the transition apparatus includes transition bracket and is rotationally connected with transition bracket
First Transition roller and the second transition roller, the First Transition roller are higher than first stack, and second transition roller is less than institute
The second stack is stated, when carrying out transition to embryo material, embryo material bypasses first mistake successively after first calender calendering
Enter second calender after crossing the top of roller and the lower section of second transition roller.
The present invention is further arranged to, and the First Transition roller and second transition roller are both provided with several.
The present invention is further arranged to, and is both provided between the adjacent First Transition roller and adjacent second transition roller
Setpoint distance.
The present invention is further arranged to, and second transition roller is liftable to be connected to the transition bracket.
The present invention is further arranged to, and the both ends of the First Transition roller and second transition roller are rotationally connected with institute
State transition bracket, the diameter in the middle part of the First Transition roller is more than the diameter at the First Transition roller both ends, the First Transition
The middle part of roller is arc-shaped structure, and is arc-shaped mistake between the middle part of the First Transition roller and the First Transition roller both ends
Cross connection, the diameter in the middle part of second transition roller is more than the diameter at the second transition roller both ends, second transition roller
Middle part is arc-shaped structure, and is that arc-shaped transition connects between the middle part of second transition roller and the second transition roller both ends
Connect.
Present invention also offers a kind of using the calendering process that as above any one of them re-entrant trough profiled steel sheeting is rolled, including
Following steps：
S1, carries out first step calendering to embryo material by the first calender, is preliminary sheet by embryo material calendering, and cause just
The interior thickness of the sheet embryo material of step is less than thickness of two sides；
S2, the middle part of the embryo material in S1 and both sides are carried out second step calendering by the second calender, and cause embryo
The interior thickness of material is consistent with thickness of two sides.
Compared with prior art, the present invention provides the re-entrant trough profiled steel sheeting and pressure for being used to prepare polytetrafluoroethyltwo two-way stretch film
Prolong method, when the embryo material to polytetrafluoroethylene film rolls, be first embryo material enter on the first calender two
Between the middle part of a first stack, the first calender runs and embryo material is rolled, and embryo material is pressed into initial sheet, wherein
Since the diameter in the middle part of the first stack is more than the diameter at both ends, so the first stack is more than the calendering stroke in the middle part of embryo material
The calendering stroke of both sides；Embryo material out enters the second calender afterwards from the first calender, and receives two second pressures
Prolong the calendering of roller, be parallel between two the second stacks, so allow for the flake structure that embryo material forms consistency of thickness.
When embryo material is rolled in the first calender, since the diameter in the middle part of the first stack is greater than the diameter of both sides,
So so that embryo material relative to cylindrical embryo material there are more embryo materials to live from middle part to both sides under the action of the first stack
It is dynamic, but the calendering stroke being subject in the middle part of embryo material is maximum, so so that the thickness in the middle part of embryo material is small after the calendering of the first calender
Thickness in both sides, at the same density be more than embryo material both sides density, and the partial density more remote with middle part distance is smaller, thickness more
Greatly；After embryo material is entered in the second calender, the spacing between two the second stacks is consistent, while two second calenderings
The minimum range being smaller than between two the first stacks between roller, so the second calender can be into whole embryo material
Row calendering, for the second stack when being rolled, the part in the middle part of embryo material is subject to the stroke that the second stack rolls
The stroke rolled less than embryo material both sides, so the calendering degree that the part of embryo material both sides is subject to is more than what center section was subject to
Calendering degree, so for the thin slice that calendering comes out, the density increase degree of both sides is more than middle increase degree, still
Since the density before the calendering of the second calender in the middle part of embryo material is more than the density of both sides, so after by rolling twice, just
To a certain extent so that the density among thin slice and the difference between the density of both sides are provided with a degree of reduction, so
It is also possible that the density for the polytetrafluoroethylene film produced is more uniformly distributed after follow-up stretched operation is completed, structure is equal
Even property higher, so as to improve the quality of processing.
Brief description of the drawings
Fig. 1 is the structure diagram of re-entrant trough profiled steel sheeting in one embodiment of the invention；
Fig. 2 is the structure diagram of the first stack in one embodiment of the invention；
Fig. 3 is the structure diagram of the second stack in one embodiment of the invention；
Fig. 4 is the structure diagram of First Transition roller in one embodiment of the invention.
Wherein, 1, the first housing；2nd, the first stack；3rd, the second housing；4th, the second stack；5th, transition bracket；6th,
One transition roller；7th, the second transition roller.
Embodiment
Below in conjunction with the drawings and specific embodiments to the polytetrafluoroethyltwo two-way stretch film proposed by the present invention of being used to prepare
Re-entrant trough profiled steel sheeting and calendering process are described in further detail.According to following explanation and claims, advantages of the present invention and spy
Sign will become apparent from.It should be noted that attached drawing uses using very simplified form and non-accurate ratio, only to side
Just the purpose of the embodiment of the present invention, is lucidly aided in illustrating.The same or similar reference numeral represents same or similar in attached drawing
Component.
Embodiment 1
A kind of re-entrant trough profiled steel sheeting for being used to prepare polytetrafluoroethyltwo two-way stretch film, as shown in Figures 1 to 4, including：First pressure
Prolong machine and the second calender, first calender and second calender are used to successively roll embryo material, described
First calender includes the first housing 1 and in being symmetrical arranged up and down, and is rotationally connected with two of the first housing 1
One stack 2, second calender includes the second housing 3 and in being symmetrical arranged up and down, and is rotationally connected with described second
Two the second stacks 4 of body 3, the both ends of first stack 2 are connected to the first housing 1, first calendering
The diameter at the middle part of roller 2 is more than the diameter at 2 both ends of the first stack, and the middle part of first stack 2 is arc-shaped structure,
And be arc-shaped transition connection between the middle part of first stack 2 and 2 both ends of the first stack, second calendering
The both ends of roller 4 are equal with the diameter at middle part, and the minimum range in calendering between two first stacks 2 is more than two institutes
State the minimum range between the second stack 4.
Minimum range in calendering between two first stacks 2 is 100-1000 microns, and the present embodiment takes 400
Micron.Minimum range in calendering between two second stacks 4 is 50-500 microns, and the present embodiment takes 250 microns.
Further included transition apparatus, the transition apparatus between first calender and second calender,
Embryo material for being pointed between first calender and second calender is supported.Wherein, the transition apparatus
Including 6 and second transition roller 7 of transition bracket 5 and the First Transition roller being rotationally connected with transition bracket 5, wherein First Transition
For roller 6 as the shape of the second transition roller 7, the First Transition roller 6 is higher than first stack 2, second transition roller 7
Less than second stack 4, when carrying out transition to embryo material, embryo material is after first calender calendering successively around described
Enter second calender behind the top of First Transition roller 6 and the lower section of second transition roller 7.
Preferably, the First Transition roller 6 and second transition roller 7 are both provided with several.Adjacent first mistake
Cross between roller 6 and adjacent second transition roller 7 and be both provided with setpoint distance, wherein setpoint distance is 50 centimetres.
Second transition roller 7 is connected to the transition bracket 5 by the way that elevator is liftable, so as to change first
Difference in height between 6 and second transition roller 7 of transition roller.
The both ends of the First Transition roller 6 and second transition roller 7 are rotationally connected with the transition bracket 5, described
The diameter at the middle part of First Transition roller 6 is more than the diameter at 6 both ends of First Transition roller, and the middle part of the First Transition roller 6 is circle
Arcuate structure, and be that arc-shaped transition connects between the middle part of the First Transition roller 6 and 6 both ends of First Transition roller, institute
The diameter for stating the middle part of the second transition roller 7 is more than the diameter at 7 both ends of the second transition roller, and the middle part of second transition roller 7 is
Arc-shaped structure, and be arc-shaped transition connection between the middle part of second transition roller 7 and 7 both ends of the second transition roller.
Present invention also offers a kind of using the calendering process that as above any one of them re-entrant trough profiled steel sheeting is rolled, including
Following steps：
S1, carries out first step calendering to embryo material by the first calender, is preliminary sheet by embryo material calendering, and cause just
The interior thickness of the sheet embryo material of step is less than thickness of two sides；
S2, the middle part of the embryo material in S1 and both sides are carried out second step calendering by the second calender, and cause embryo
The interior thickness of material is consistent with thickness of two sides.
Present invention also offers a kind of production method of polytetrafluoroethylene film, comprise the following steps：
Step 1, it is 1 according to mass ratio by isomery hexadecane and polytetrafluoroethyldispersion dispersion resin：0.26 mixing, obtains batch mixing；
Step 2, the batch mixing in step 1 is pressed into the cylinder blank of Ф 120mm in advance under the pressure of 3MPa；
Step 3, the blank of cylinder is put into extruder, the round bar embryo material of Ф 20mm is forced at 50 DEG C；
Step 4, the first calender carries out first step calendering to round bar embryo material, is sheet embryo material by embryo material calendering, and cause
The interior thickness of sheet embryo material is less than thickness of two sides；
Step 5, the second calender carries out second step calendering to the middle part of the sheet embryo material in step 4 and both sides, and
So that the interior thickness of embryo material is consistent with thickness of two sides；
Step 6, the isomery hexadecane in polytetrafluoroethyldispersion dispersion resin is removed in the environment of 150 DEG C, obtains base band,
Wherein the thickness of this base band is 230 ± 5 microns, and density is 1.638 ± 0.05g/cm3；
Step 7, the base band in step 6 is subjected to longitudinal stretching in 280 DEG C of drawing oven, stretching ratio is 3 times, base
Band emitting rate is 3.5m/s；
Step 8, the base band after longitudinal stretching is subjected to cross directional stretch on tenter, draft temperature is 30 DEG C, forms film；
Step 9, the film in step 8 is sintered in 350 DEG C of sintering baking ovens, completes processing.
In conclusion re-entrant trough profiled steel sheeting and calendering side provided by the present invention for preparing polytetrafluoroethyltwo two-way stretch film
Method, when being rolled, round bar embryo material is entered in the first calender, is subject to the calendering effect of the first stack 2 to be formed
Sheet embryo material, sheet embryo material bypass several 6 and second transition rollers 7 of First Transition roller successively after being come out from the first calender,
Enter afterwards in the second calender, and be subject to the calendering effect of the second stack 4；Wherein due to the middle part of the first stack 2
Diameter is greater than the diameter at both ends, so when rolling to round bar embryo material, the row that is calendered in the middle part of round bar embryo material
Journey distance is more than the calendering stroke distances of round bar embryo material both sides, simultaneously because being all round between the middle part of the first stack 2 and both sides
The structure of arc, while such round bar embryo material middle part is subject to the calendering of the first stack 2, the embryo material at middle part is also simultaneously towards two
Lateral movement, and reduce embryo material total amount possessed by middle part, while the middle part of the sheet embryo material formed by the first calender
Density is larger, and thickness is smaller.
Sheet embryo material is after entering in the second calender, and the second stack 4 rolls sheet embryo material, due to two
It is parallel between a second stack 4, so when rolling to sheet embryo material, it becomes possible to which sheet embryo material is rolled
Into the base band of consistency of thickness；Wherein the second stack 4 rolls sheet embryo material both sides when rolling to sheet embryo material
Stroke be more than to the calendering stroke in the middle part of sheet embryo material, so during calendering, allow for the density of sheet embryo material both sides
Increase degree be more than sheet embryo material in the middle part of density increase degree, still, due to sheet embryo material enter the second calender it
Preceding Density Distribution situation is more than the density of both sides for the density at middle part, so passes sequentially through the first calender and the second calender
Density contrast between the middle part and both sides of the base band for allowing for obtaining afterwards has carried out one and has made up, to a certain extent so that base
It is more close balanced with overall density.
During follow-up longitudinal stretching and cross directional stretch, since the density of base band is more balanced, so in longitudinal drawing
When stretching with cross directional stretch, the degree that base band deforms upon is also more balanced, equally also so that after subsequent heat shaping
The bulk properties such as the density of film are also more closely, improve the quality of polytetrafluoroethylene film.
Wherein successively around after 6 and second transition roller 7 of First Transition roller after embryo material comes out from the first calender
Enter in the second calender, embryo material can carry out of short duration support when on transition apparatus to embryo material, so as to compared with
Good prevents embryo material from being sprung back after by the first calender；Simultaneously because the second transition roller 7 is liftable, so work as
When the emitting rate of first calender is more than the process velocity of the second calender, the second transition roller 7 can be driven to decline
And more embryo materials are supported by transition apparatus, it is therefore prevented that embryo material touches ground and pollution etc. occurs；It is identical, when
When the speed ratio second that first calender sends embryo material rolls mach slow-footed, the second transition roller 7 can rise, and
A part of embryo material is released, so as to prevent embryo material that excessive tension force effect occurs, protective effect is played to embryo material.
Moreover, since all there is setpoint distance between each other in adjacent 6 and second transition roller 7 of First Transition roller,
It so can not only preferably prevent adjacent embryo material from mutual friction occurs, while also increase positioned at the first calender and the
Total embryo material storage volume, can store more embryo materials between two calenders.Simultaneously because 6 and second mistake of First Transition roller
It is all the diameter that mid diameter is more than both ends to cross roller 7, so when the embryo material to intermediate thin both sides thickness carries out transition support
Wait, additionally it is possible to improve the stability of strutting system between 6 and second transition roller 7 of embryo material and First Transition roller, while 6 He of First Transition roller
The supporting force bigger at the middle part of the second transition roller 7, also preferably prevents embryo material to spring back.
Now take the common polytetrafluoroethylene film of in the market and the polytetrafluoroethylene film of the present embodiment production is surveyed
Try, take polytetrafluoroethylene film at random in test and tested as sample, wherein test content includes：
Grammes per square metre tests (g/m2), grammes per square metre test is tested according to ISO3801；
Air penetrability tests (mm/s), and air penetrability is tested according to GB/T5453-1997, is tested under the conditions of Δ P=200KPa；
Vapor transfer rate (g/m2× 24hr), vapor transfer rate is tested according to ASTM E96-X1.1.6；
Test result is as shown in the table：
It can be seen that the standard of each item data of polytetrafluoroethylene film processed by the present embodiment by above-mentioned data
Difference is respectively less than polytetrafluoroethylene film common on existing market, i.e., re-entrant trough profiled steel sheeting through this embodiment, calendering process and
The production method of polytetrafluoroethylene film enables to grammes per square metre between polytetrafluoroethylene (PTFE) various pieces, thickness, air penetrability and thoroughly
Moisture close to and balance so that the quality higher of polytetrafluoroethylene film.
Embodiment 2
A kind of production method of polytetrafluoroethylene film, is with the difference of embodiment 1, comprises the following steps：
Step 1, it is 1 according to mass ratio by isomery hexadecane and polytetrafluoroethyldispersion dispersion resin：0.3 mixing, obtains batch mixing；
Step 2, the batch mixing in step 1 is pressed into the cylinder blank of Ф 120mm in advance under the pressure of 1MPa；
Step 3, the blank of cylinder is put into extruder, the round bar embryo material of Ф 20mm is forced at 60 DEG C；
Step 4, the first calender carries out first step calendering to round bar embryo material, is sheet embryo material by embryo material calendering, and cause
The interior thickness of sheet embryo material is less than thickness of two sides；
Step 5, the second calender carries out second step calendering to the middle part of the sheet embryo material in step 4 and both sides, and
So that the interior thickness of embryo material is consistent with thickness of two sides；
Step 6, the isomery hexadecane in polytetrafluoroethyldispersion dispersion resin is removed in the environment of 200 DEG C, obtains base band,
Wherein this base thickness is 300 ± 5 microns, and density is 1.638 ± 0.05g/cm3；
Step 7, the base band in step 6 is subjected to longitudinal stretching in 260 DEG C of drawing oven, stretching ratio is 4 times, base
Band emitting rate is 4.5m/s；
Step 8, the base band after longitudinal stretching is subjected to cross directional stretch on tenter, draft temperature is 30 DEG C, forms film；
Step 9, the film in step 8 is sintered in 350 DEG C of sintering baking ovens, completes processing.
Wherein, thickness will be depressed into the step 4 in the middle part of embryo material as 500 microns.By the thickness of embryo material in the step 5
Degree is depressed into as 280 microns, and the first stack 2, the second stack 42 are pre-heated to 60 DEG C before calendering.
Now take the common polytetrafluoroethylene film of in the market and the polytetrafluoroethylene film of the present embodiment production is surveyed
Try, take polytetrafluoroethylene film at random in test and tested as sample, wherein test content includes：Bubble pressure test
(MPa), wherein bubble pressure test is tested according to QB/T 5002-2016；
Air flux tests (m3/m2/ h), wherein air flux test is according to QB/T5002-2016, in Δ P=
Tested under the conditions of 0.01MPa；
It can be seen that the standard of each item data of polytetrafluoroethylene film processed by the present embodiment by above-mentioned data
Difference is respectively less than polytetrafluoroethylene film common on existing market, i.e., the production method of polytetrafluoroethylene film through this embodiment
Enable to bubble pressure, thickness and air flux between polytetrafluoroethylene film various pieces close to and balance so that
The quality higher of polytetrafluoroethylene film.
It should be noted that each embodiment is described by the way of progressive in this specification, each embodiment emphasis is said
Bright is all the difference with other embodiment, between each embodiment identical similar portion mutually referring to.
Foregoing description is only the description to present pre-ferred embodiments, not to any restriction of the scope of the invention, this hair
Any change, the modification that the those of ordinary skill in bright field does according to the disclosure above content, belong to the protection of claims
Scope.
Claims (10)
- A kind of 1. re-entrant trough profiled steel sheeting for being used to prepare polytetrafluoroethyltwo two-way stretch film, it is characterised in that including：First calender with And second calender, first calender and second calender are used to successively roll embryo material, first pressure Prolong machine and include the first housing and in being symmetrical arranged up and down, and be rotationally connected with two first calenderings of the first housing Roller, second calender includes the second housing and in being symmetrical arranged up and down, and is rotationally connected with the two of the second housing A second stack, the both ends of first stack are connected to the first housing, the diameter in the middle part of first stack More than the diameter at the first stack both ends, the middle part of first stack is arc-shaped structure, and described first rolls It is arc-shaped transition connection between the middle part of roller and the first stack both ends, the both ends of second stack and middle part Diameter is equal, and the minimum range in calendering between two first stacks is more than between two second stacks Minimum range.
- 2. re-entrant trough profiled steel sheeting according to claim 1, it is characterised in that in calendering between two first stacks Minimum range is 100-1000 microns.
- 3. re-entrant trough profiled steel sheeting according to claim 2, it is characterised in that in calendering between two second stacks Minimum range is 50-500 microns.
- 4. re-entrant trough profiled steel sheeting according to any one of claims 1 to 3, it is characterised in that further included transition apparatus, the mistake Device is crossed between first calender and second calender, for being pointed to first calender and described Embryo material between two calenders is supported.
- 5. re-entrant trough profiled steel sheeting according to claim 4, it is characterised in that the transition apparatus includes transition bracket and rotation The First Transition roller and the second transition roller being connected on transition bracket, the First Transition roller are higher than first stack, institute State the second transition roller and be less than second stack, when carrying out transition to embryo material, embryo material is after first calender calendering Enter second calender after bypassing the top of the First Transition roller and the lower section of second transition roller successively.
- 6. re-entrant trough profiled steel sheeting according to claim 5, it is characterised in that the First Transition roller and second transition roller are equal It is provided with several.
- 7. re-entrant trough profiled steel sheeting according to claim 6, it is characterised in that the adjacent First Transition roller and adjacent described second Setpoint distance is both provided between transition roller.
- 8. according to claim 5 to 7 any one of them re-entrant trough profiled steel sheeting, it is characterised in that second transition roller is liftable It is connected to the transition bracket.
- 9. re-entrant trough profiled steel sheeting according to claim 8, it is characterised in that the First Transition roller and second transition roller Both ends are rotationally connected with the transition bracket, and the diameter in the middle part of the First Transition roller is more than the First Transition roller both ends Diameter, the middle part of the First Transition roller are arc-shaped structure, and the middle part of the First Transition roller and the First Transition roller It is that arc-shaped transition connects between both ends, the diameter in the middle part of second transition roller is more than the straight of the second transition roller both ends Footpath, the middle part of second transition roller are arc-shaped structure, and the middle part of second transition roller and second transition roller two It is arc-shaped transition connection between end.
- 10. a kind of calendering process rolled using such as claim 1 to 9 any one of them re-entrant trough profiled steel sheeting, its feature are existed In comprising the following steps：S1, carries out first step calendering to embryo material by the first calender, is preliminary sheet by embryo material calendering, and cause tentatively The interior thickness of sheet embryo material is less than thickness of two sides；S2, the middle part of the embryo material in S1 and both sides are carried out second step calendering by the second calender, and cause embryo material Interior thickness is consistent with thickness of two sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711488662.8A CN107984668A (en) | 2017-12-29 | 2017-12-29 | It is used to prepare the re-entrant trough profiled steel sheeting and calendering process of polytetrafluoroethyltwo two-way stretch film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711488662.8A CN107984668A (en) | 2017-12-29 | 2017-12-29 | It is used to prepare the re-entrant trough profiled steel sheeting and calendering process of polytetrafluoroethyltwo two-way stretch film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107984668A true CN107984668A (en) | 2018-05-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711488662.8A Pending CN107984668A (en) | 2017-12-29 | 2017-12-29 | It is used to prepare the re-entrant trough profiled steel sheeting and calendering process of polytetrafluoroethyltwo two-way stretch film |
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| CN (1) | CN107984668A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112571708A (en) * | 2020-11-17 | 2021-03-30 | 中国电子科技集团公司第四十六研究所 | Calendering method of ultrathin polytetrafluoroethylene substrate |
| CN112720993A (en) * | 2020-12-02 | 2021-04-30 | 界首市天鸿新材料股份有限公司 | Adjusting mechanism of lithium battery diaphragm calender |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112571708A (en) * | 2020-11-17 | 2021-03-30 | 中国电子科技集团公司第四十六研究所 | Calendering method of ultrathin polytetrafluoroethylene substrate |
| CN112720993A (en) * | 2020-12-02 | 2021-04-30 | 界首市天鸿新材料股份有限公司 | Adjusting mechanism of lithium battery diaphragm calender |
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