CN106313577A - Production technology of biaxially oriented polyester film - Google Patents
Production technology of biaxially oriented polyester film Download PDFInfo
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- CN106313577A CN106313577A CN201610656277.9A CN201610656277A CN106313577A CN 106313577 A CN106313577 A CN 106313577A CN 201610656277 A CN201610656277 A CN 201610656277A CN 106313577 A CN106313577 A CN 106313577A
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- section
- polyester film
- stretching
- biaxially oriented
- preheating
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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
- 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
- B29C48/50—Details of extruders
- B29C48/69—Filters or screens for the moulding material
-
- 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
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- 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
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- 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
- 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
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
- B29K2067/003—PET, i.e. poylethylene terephthalate
-
- 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)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention discloses a production technology of a biaxially oriented polyester film. The technology comprises steps including measuring and mixing, pre-crystallization and drying, melt extrusion, filtration, casting, longitudinal drawing, transverse drawing, traction winding and the like; secondary filtration is adopted in filtration, the opening degree of casting mold lips is 1.3 mm, the pre-drawing rate ranges from 1 to 15, the linear speed of a chill drum ranges from 70 m/min to 75 m/min, and an electrostatic electrode adopts a steel wire; and the longitudinal drawing technology sequentially comprises three stages including a preheating stage, a drawing stage and a cooling stage. With the technology, the thickness of the polyester film can be effectively reduced, and the produced polyester film has properties of uniform thickness, excellent dielectric property, excellent heat stability and the like and can be used as a capacitor base material.
Description
Technical field
The present invention relates to field of film preparation.It is more particularly related to the life of a kind of biaxially oriented polyester film
Production. art.
Background technology
Biaxially oriented polyester film, is again BOPET film, due to its excellent physical and mechanical properties, electrical apparatus insulation performance,
Barrier property, heat resistance, optical property and dimensional stability etc., mylar has become as second of polyester and mainly should
By approach, extensively application and tape, packaging, photosensitive, electrical apparatus insulation, print, draw, the field such as label.Along with mylar
The expanding day of application, some performance of conventional polyester thin film can not meet the application at some special dimension, city
The functional polyalkylene ester film with some specific function is badly in need of in field.Such as sub-smooth type mylar, anti-static polyester film, thermal contraction
Mylar, ultrathin film, ultrathin heat transfer thin film etc..
Along with the high speed development of the industry such as electronics, electrical equipment, for the most requisite electrical equipment capacitor,
Require it constantly to miniaturization, high capacitance, high stability development.The most also certainly will require as button capacitor insulating substrate
Mylar, has a performance requirement special relative to general mylar, thickness ultrathin and uniform, excellent dielectric properties,
Excellent heat stability.
The most in the world, conventional ultra thin type polyester film processing method, the most all use the most special raw material, use
Special production line and special stretching mode are made.Wherein stretching mode the most all uses the method that single-point stretches.Wherein indulge
The maximum temperature drawn is usually no more than 100 DEG C, and stretching ratio is between 3.5～4, and the stretching ratio of cross directional stretch is 3.8～4.3
Between.These techniques are merely capable of producing the thickness 10 above BOPET film of μm, it is impossible to meet the development need of electronic enterprises
Ask, use the BOPET film of below present processes 10 μm, easily occur that became uneven is even, wrinkling transverse fissure, tension failure, volume
The situations such as film has some setbacks.
Summary of the invention
It is an object of the invention to solve at least the above, and the advantage that at least will be described later is provided.
It is a still further object of the present invention to provide the production technology of a kind of biaxially oriented polyester film, it can effectively reduce
The thickness of BOPET film, the thin film of production have the features such as thickness is uniform, dielectric properties are excellent, excellent heat stability.
In order to realize according to object of the present invention and further advantage, it is provided that the life of a kind of biaxially oriented polyester film
Production. art, comprises the following steps: metering batch mixing, pre-crystallized dry, melt extrudes, filters, slab, longitudinal stretching, cross directional stretch,
Traction rolling, it is characterised in that:
Using disc type video disc filter to carry out double-filtration at described extrusion, the aperture of coarse filter is 15～25 μ
M, the aperture that essence filters is 8～12 μm；
In described slab operation, the aperture of die lip is 1.3mm, and prestretched ratio is 1～15, the linear velocity of cold drum be 70～
75m/min, electrostatic attraction electrode uses steel wire；
Preheating section, stretch section and 3 stages of cooling section are included successively in described longitudinal stretching technique:
Preheating section, a diameter of 200nm of longitudinal stretching unit preheating roller, arrange in " one " font, pre-hot-rolling linear velocity 50
～70m/min, preheating temperature is 88～100 DEG C；
Stretch section, stretches the thin film preheated, and uses high temperature 2 or the stretching of multiple spot small-gap suture, the temperature of stretch section
Degree scope is 100～120 DEG C, and stretching ratio is 4～6；
Cooling section, carries out Stress Release and cooling to the thin film after stretching, and temperature range is 22～28 DEG C.
In the production technology of described biaxially oriented polyester film, in order to ensure the pure of melt liquid in process of production
Degree, promotes that casting machine molten mass compactness out is good, and follow-up longitudinal stretching and cross directional stretch are unlikely to rupture of membranes, thus right
The molten mass filter in extrusion operation film head exit uses coarse filtration and essence filter cascade filtration and add pore size filter
Close, filter is revised as high-quality disc filter by plain filter, it is ensured that bigger impurity and gel do not enter casting machine
Sheet formation system, follow-up stretching not rupture of membranes.
In the production technology of described biaxially oriented polyester film, slab operation is one of key of BOPET film production,
Directly influence the stable of BOPET film and surface quality.During slab, the aperture of die lip is constant, changes product rule
During lattice, i.e. adjust prestretched ratio and realize.The existence of prestretched ratio not only can significantly reduce the pulsation feeding of dosing pump and indulge diaphragm
The adverse effect caused to thickness evenness, and the stability of molten mass flowing is had a great impact, prestretched ratio is too high, molten
Melt body is flowing instability when prestretched, the most then cause film thickness out of control, heavy then cannot be carried out Electrostatic Absorption；Prestretched was compared
Low, then can make molten mass, when Radix Aconiti Lateralis Preparata molding, packing phenomenon occur, causing film longitudinal thickness is wave uneven distribution.Prestretching
Stretch and be preferred than for 1～15, preferably 6～10.
In the production technology of described biaxially oriented polyester film, stretching process is one of key of BOPET film production,
The effect diameter of longitudinal stretching has influence on the quality of film quality and produces the stability of product.Stretch section operation, uses high temperature
2 or the stretching of multiple spot small-gap suture (in BOPET film production technology, draft temperature at 100 DEG C of hereinafter referred to as cryogenic tensiles,
It is called drawing by high temperature for more than 100 DEG C), high magnification longitudinal stretching can be realized, and can effectively realize thin film slimming, this is because
Film thickness T=Tcast/(Rm·Rt)(TcastSlab thickness, RmIndulge and draw multiplying power, RtHorizontal draw multiplying power).Little drawing gap can increase vertical
To rate of extension, and then improve thin film longitudinal fracture intensity by rate of extension increase.Pass through drawing temperature range, it is possible to carry
The uniformity of high thin film mechanical performance.
Preferably, in described longitudinal stretching operation, the longitudinal stretching equipment of employing uses Teflon material at preheating section
Roller, stretch section uses silicone rubber roller or ceramic roller, and cooling section uses chrome-plated roller.The selection of roller surface material is to reduce
Face cut and the requisite measure of roll banding.
Preferably, described preheating section pre-hot-rolling quantity is 6～10.Because Teflon material roller heat transfer coefficient is high, in advance
The quantity of hot-rolling can be greatly reduced.
Preferably, described preheating section operation drawing by high temperature adds thermal medium and uses temperature to be 90～100 DEG C of hot water, hot water ratio
Heat is big, safety non-pollution.
Preferably, described draw roll a diameter of 200～250mm, roller spacing 3～5mm.
Preferably, described preheating section and stretch section all use infrared ray auxiliary heating, the ratio of infrared ray auxiliary heating
It is 70%.Infrared heater is a kind of auxiliary heater means that BOPET film produces, and is characterized in can making in terms of thickness equal
Even intensification, to make up the deficiency of the diaphragm thickness direction temperature inequality that hot-rolling heating conduction of heat causes.
Preferably, in described longitudinal stretching operation, cooling section uses the high intensity type of cooling, and cooler-water temperature uses 12
～22 DEG C, a diameter of 250nm of longitudinal stretching unit chill roll.In longitudinal stretching, due to lepthymenia, easily rupture, mainly
It is because tandem mill cooling not, Quench ability.Unit chill roll is improved, changes major diameter into, by common
150mm is revised as 250mm, increases cooling tube, extends the cool time of film, reduces the temperature of cooling water simultaneously, control to draw
Degree of crystallinity during stretching, it is ensured that longitudinal stretching film does not ruptures.
Preferably, described cross directional stretch technique includes preheating section, stretch section, heat-setting section and 4 rank of cooling section successively
Section:
Preheating section, tentatively shapes to the thin film through being formerly coated with, and eliminates stress, and preheating prepares stretching, and temperature is
70～100 DEG C；
Stretch section, stretches the thin film preheated, and the temperature range of stretch section is 97～110 DEG C, and stretching ratio is 4
～5；
Heat-setting section, carries out thermal finalization to the thin film after stretching, makes the sequence of membrane molecular chain stable, and heat setting temperature is
225～240 DEG C；
Cooling section, carries out Stress Release and cooling to the thin film after thermal finalization, and temperature range is 40～60 DEG C.
Preferably, in described cross directional stretch operation, the effect of thermal finalization is that the molecular chain orientation making thin film is changed into knot
Brilliant orientation, thus eliminate internal stress, make thin film have good heat resistance.It is said that in general, after thermal finalization, thin film
Degree of crystallinity is up to 45%～55%, thus reduces the percent thermal shrinkage of thin film, it is ensured that the dimensional stability of thin film.If but heat is fixed
Type temperature is too high, on the one hand can reduce the hot strength of thin film, the most easily makes thin film because film crystal unity is too high
Become fragile, cause sizing rupture of membranes；Heat setting temperature is too low, does not reaches the requirement of thermal finalization, makes film heat stability energy bad.And
Ultrathin membrane is on the low side due to minimal thickness, and its thermal finalization speed is more a lot of soon than conventional thin film, if with conventional thermal finalization work
Skill produces, and can cause the thin film lax difficulty after thermal finalization on the contrary, and the horizontal percent thermal shrinkage of final products is higher.The present invention
The heat setting temperature used is between 225～240 DEG C, it is ensured that the stability of film dimensions, and thermal finalization air channel uses wind simultaneously
Pressure is uniform, the wind field of homogeneous temperature, it is ensured that the thickness evenness of thin film.
The present invention at least includes following beneficial effect:
(1), during extrusion is melted, melt is carried out twice filtration, the large-scale impurity of melt can be removed, prevent impurity to essence
The infringement of close apparatus.
(2) stretch section uses 2 small-gap suture stretchings of high temperature, can realize high magnification longitudinal stretching, thus can be in casting film condition
High speed drawing-die is realized in the case of constant；Multiplying power is drawn, it is possible in the case of casting film condition is constant, it is achieved thin film by improving to indulge
Slimming；Little drawing gap can increase longitudinal stretching speed, and then it is strong to improve thin film longitudinal fracture by rate of extension increase
Degree；Little drawing gap can reduce and vertical draws constriction amount, and constriction amount is little, and in production, ratio shared by film side film is the least, and product yield carries
High.
(3) during slab, by controlling prestretched ratio, it is possible to achieve the conversion of multi-thickness specification.
(4) in longitudinal stretching operation, select the surface rubber roll of different materials, can effectively reduce face cut and
Roll banding.
Accompanying drawing explanation
Fig. 1 is present invention process flow chart.
Detailed description of the invention
The present invention is described in further detail below in conjunction with the accompanying drawings, to make those skilled in the art with reference to description literary composition
Word can be implemented according to this.
The preparation of embodiment 1:8 μm BOPET film,
Fig. 1 is shown in technological process, and wherein main technique is as follows:
Filter progress: the aperture of coarse filter is 20 μm, the aperture that essence filters is 10 μm.
Slab operation: the aperture of die lip is 1.3mm, prestretched ratio: 11.8, the linear velocity of cold drum is 70m/min, electrostatic electricity
Pole uses steel wire.
Longitudinal stretching:
Warm-up phase, pre-hot-rolling uses Teflon material roller, a diameter of 200nm, quantity 10；Pre-hot-rolling linear velocity 50m/
Min, preheating temperature is 88 DEG C, and the ratio of infrared ray auxiliary heating is 70%；
Stretch section, silicone rubber roller, diameter 200mm, the temperature of stretch section 100 DEG C, stretching ratio is 4.45, and infrared ray is auxiliary
The ratio helping heating is 70%；
Cooling section, a diameter of 250nm of chrome-plated roller, chilling temperature 25 DEG C.
Cross directional stretch:
Preheating section, temperature is 75 DEG C；
Stretch section, temperature 100 DEG C, stretching ratio is 4；
Heat-setting section, temperature is 230 DEG C；
Cooling section, temperature range is 45 DEG C；
The preparation of embodiment 2:6 μm BOPET film
Fig. 1 is shown in technological process, and wherein main technique is as follows:
Filter progress: the aperture of coarse filter is 15 μm, the aperture that essence filters is 8 μm.
Slab operation: the aperture of die lip is 1.3mm, prestretched ratio: 14.8, the linear velocity of cold drum is 72m/min, electrostatic electricity
Pole uses steel wire.
Longitudinal stretching:
Warm-up phase, pre-hot-rolling uses Teflon material roller, a diameter of 200nm, quantity 10；Pre-hot-rolling linear velocity 60m/
Min, preheating temperature is 90 DEG C, and the ratio of infrared ray auxiliary heating is 70%；
Stretch section, draw roll ceramic roller, diameter 220mm, the temperature of stretch section is 110 DEG C, and stretching ratio is 5, infrared ray
The ratio of auxiliary heating is 70%；
Cooling section, a diameter of 250nm of chrome-plated roller, chilling temperature scope is 28 DEG C.
Cross directional stretch:
Preheating section, temperature is 80 DEG C；
Stretch section, temperature range is 97 DEG C, and stretching ratio is 5；
Heat-setting section, temperature is 240 DEG C；
Cooling section, temperature range is 60 DEG C.
The preparation of embodiment 3:10 μm BOPET film
Fig. 1 is shown in technological process, and wherein main technique is as follows:
Filter progress: the aperture of coarse filter is 25 μm, the aperture that essence filters is 12 μm.
Slab operation: the aperture of die lip is 1.3mm, prestretched ratio: 8.2, the linear velocity of cold drum is 75m/min, electrostatic electricity
Pole uses steel wire.
Longitudinal stretching:
Warm-up phase, pre-hot-rolling uses Teflon material roller, a diameter of 200nm, quantity 10；Pre-hot-rolling linear velocity 65m/
Min, preheating temperature is 100 DEG C, and the ratio of infrared ray auxiliary heating is 70%；
Stretch section, draw roll ceramic roller, diameter 250mm, the temperature of stretch section is 108 DEG C, and stretching ratio is 4, infrared ray
The ratio of auxiliary heating is 70%；
Cooling section, a diameter of 250nm of chrome-plated roller, chilling temperature scope is 28 DEG C.
Cross directional stretch:
Preheating section, temperature is 88 DEG C；
Stretch section, temperature range is 102 DEG C, and stretching ratio is 4；
Heat-setting section, temperature is 238 DEG C；
Cooling section, temperature range is 58 DEG C.
It is as shown in the table for the performance of the product obtained:
Although embodiment of the present invention are disclosed as above, but it is not restricted in description and embodiment listed
Using, it can be applied to various applicable the field of the invention completely, for those skilled in the art, and can be easily
Realizing other amendment, therefore under the general concept limited without departing substantially from claim and equivalency range, the present invention does not limit
In specific details with shown here as the legend with description.
Claims (8)
1. the production technology of biaxially oriented polyester film, comprises the following steps: metering batch mixing, pre-crystallized dry, melt extrudes, mistake
Filter, slab, longitudinal stretching, cross directional stretch, draws rolling, it is characterised in that:
Using disc type video disc filter to carry out double-filtration at described extrusion, the aperture of coarse filter is 15～25 μm, essence
The aperture filtered is 8～12 μm；
In described slab operation, the aperture of die lip is 1.3mm, and prestretched ratio is 1～15, and the linear velocity of cold drum is 70～75m/
Min, electrostatic attraction electrode uses steel wire；
Preheating section, stretch section and 3 stages of cooling section are included successively in described longitudinal stretching technique:
Preheating section, longitudinal stretching unit preheating roller a diameter of 200nm, in " one " font arrange, pre-hot-rolling linear velocity be 50～
70m/min, preheating temperature is 88～100 DEG C；
Stretch section, stretches the thin film preheated, and the temperature range of stretch section is 100～120 DEG C, stretching ratio be 4～
6；
Cooling section, carries out Stress Release and cooling to the thin film after stretching, and temperature range is 22～28 DEG C.
2. the production technology of biaxially oriented polyester film as claimed in claim 1, it is characterised in that described longitudinal stretching operation
In, the longitudinal stretching equipment of employing uses Teflon material roller at preheating section, and stretch section uses silicone rubber roller or pottery
Roller, cooling section uses chromium plating roller.
3. the production technology of biaxially oriented polyester film as claimed in claim 1, it is characterised in that the pre-hot-rolling of described preheating section
Quantity is 6～10.
4. the production technology of biaxially oriented polyester film as claimed in claim 1, it is characterised in that described preheating section operation is high
Temperature stretching adds thermal medium and uses the hot water of 90～100 DEG C.
5. the production technology of biaxially oriented polyester film as claimed in claim 1, it is characterised in that described draw roll is a diameter of
200～250mm, roller spacing 3～5mm.
6. the production technology of biaxially oriented polyester film as claimed in claim 1, it is characterised in that described preheating section and stretching
Section all uses infrared ray auxiliary heating, and the ratio of infrared ray auxiliary heating is 70%.
7. the production technology of biaxially oriented polyester film as claimed in claim 1, it is characterised in that described longitudinal stretching operation
Middle cooling section uses the high intensity type of cooling, and cooler-water temperature uses 12～22 DEG C, longitudinal stretching unit chill roll a diameter of
250nm。
8. the production technology of biaxially oriented polyester film as claimed in claim 1, it is characterised in that described cross directional stretch technique
Include preheating section, stretch section, heat-setting section and 4 stages of cooling section successively:
Preheating section, tentatively shapes to the thin film through being formerly coated with, eliminate stress, preheating prepare stretching, temperature be 70～
100℃；
Stretch section, stretches the thin film preheated, and the temperature range of stretch section is 97～110 DEG C, and stretching ratio is 4～5；
Heat-setting section, carries out thermal finalization to the thin film after stretching, makes the sequence of membrane molecular chain stable, heat setting temperature be 225～
240℃；
Cooling section, carries out Stress Release and cooling to the thin film after thermal finalization, and temperature range is 40～60 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610656277.9A CN106313577A (en) | 2016-08-11 | 2016-08-11 | Production technology of biaxially oriented polyester film |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610656277.9A CN106313577A (en) | 2016-08-11 | 2016-08-11 | Production technology of biaxially oriented polyester film |
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| CN106313577A true CN106313577A (en) | 2017-01-11 |
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ID=57740728
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| CN201610656277.9A Pending CN106313577A (en) | 2016-08-11 | 2016-08-11 | Production technology of biaxially oriented polyester film |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111300783A (en) * | 2020-02-26 | 2020-06-19 | 四川省科学城久信科技有限公司 | Preparation process of double-sided electrically-polarized polypropylene film |
| CN112805137A (en) * | 2018-10-05 | 2021-05-14 | 东洋纺株式会社 | Biaxially oriented polyamide film and rolled polyamide film roll |
| CN113844141A (en) * | 2021-09-23 | 2021-12-28 | 上海索康医用材料有限公司 | Expanded polytetrafluoroethylene surgical isolating membrane and manufacturing process thereof |
| CN114683592A (en) * | 2022-04-14 | 2022-07-01 | 江苏慧智新材料科技有限公司 | Preparation method of high-flatness heat-resistant polyester film and polyester film |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112805137A (en) * | 2018-10-05 | 2021-05-14 | 东洋纺株式会社 | Biaxially oriented polyamide film and rolled polyamide film roll |
| CN112805137B (en) * | 2018-10-05 | 2022-11-29 | 东洋纺株式会社 | Biaxially oriented polyamide film and rolled polyamide film roll |
| CN111300783A (en) * | 2020-02-26 | 2020-06-19 | 四川省科学城久信科技有限公司 | Preparation process of double-sided electrically-polarized polypropylene film |
| CN113844141A (en) * | 2021-09-23 | 2021-12-28 | 上海索康医用材料有限公司 | Expanded polytetrafluoroethylene surgical isolating membrane and manufacturing process thereof |
| CN113844141B (en) * | 2021-09-23 | 2023-09-15 | 上海索康医用材料有限公司 | Expanded polytetrafluoroethylene surgical isolation membrane and manufacturing process thereof |
| CN114683592A (en) * | 2022-04-14 | 2022-07-01 | 江苏慧智新材料科技有限公司 | Preparation method of high-flatness heat-resistant polyester film and polyester film |
| CN114683592B (en) * | 2022-04-14 | 2023-12-22 | 江苏慧智新材料科技有限公司 | Preparation method of high-flatness heat-resistant polyester film and polyester film |
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Application publication date: 20170111 |