CN101134367A - Method for producing thick low hot shrinkage rate polyester film - Google Patents
Method for producing thick low hot shrinkage rate polyester film Download PDFInfo
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- CN101134367A CN101134367A CNA2007101333948A CN200710133394A CN101134367A CN 101134367 A CN101134367 A CN 101134367A CN A2007101333948 A CNA2007101333948 A CN A2007101333948A CN 200710133394 A CN200710133394 A CN 200710133394A CN 101134367 A CN101134367 A CN 101134367A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92523—Force; Tension
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92904—Die; Nozzle zone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92923—Calibration, after-treatment or cooling zone
Abstract
The process of producing thick polyester film with low thermal shrinkage rate includes the following steps: 1. melting material, extruding thick sheet and cooling; 2. stripping thick sheet, heating, longitudinally stretching in the line speed of 0.2-1.1 m/s and stretching power of 2.0-3.5 to 1, longitudinally relaxing and fixing; 3. preheating, transversely stretching at 110-160 deg.c and in stretching power of 3.0-5.0 to 1, longitudinally and transversely relaxing, and fixing; 4. cooling in the line speed lower than line speed in transverse stretching, heating, longitudinally post-relaxing, cooling and fixing; 5. high voltage corona treatment; and 6. winding the film in the line speed lower than the longitudinally relaxing line speed and in the tension controlled in 100-250 N. The process can reduce the longitudinal thermal shrinkage rate to near to or equal to the transverse thermal shrinkage rate.
Description
Technical field
The present invention relates to a kind of base materials such as thin film switch, flexible print circuit board and thickness of being used in the production method of the thick low hot shrinkage factor polyester film of (0.1mm-0.35mm), belong to field of thin film fabrication.
Background technology
Along with the fast development of electron trade and the raising of people's living standard, electronic product trends towards developing towards ultralight, ultra-thin direction, this has obviously increased the demand to thin film switch, flexible print circuit board etc., and will obtain using comparatively widely as the heavy duty polyester film of its base material.Conventional thin film switch from top to bottom by face mask layer, separation layer, go up wiring board, wiring board, attachment plug and be used for rubberised layer bonding between each layer and constitute down.This face mask layer adopts biaxially oriented polyester film usually, and prints after sided corona treatment and form, and upper and lower wiring board is generally also selected biaxially oriented polyester film for use, and coats the conductive coating paint that can solidify on its surface under cryogenic conditions.Therefore film must have good insulation performance, hear resistance, fold resistance and higher resilience.
In order to make biaxially oriented polyester film satisfy above requirement, must make this kind polyester film in length and breadth two to having lower percent thermal shrinkage, purpose is to avoid that deformation takes place the variation because of temperature, humidity when making thin film switch.In addition, this film also must have higher modulus of elasticity, outstanding mechanical property and chemical resistance etc.
CN1565835A discloses " a kind of low heat shrinkage polyester film and production method thereof ", the thickness of this polyester film is equal to or less than 0.075mm, this film is to contain the multi-layer co-extruded structure of one deck structure at least, its horizontal percent thermal shrinkage is at 150 ℃, under 30 minutes the condition less than 0.4%, at 190 ℃, under 20 minutes the condition less than 1.0%.This low heat shrinkage polyester film is after polyester raw material is put into the extruder fusion, is extruded into the co-extrusion module, arrive cold drum by T type flat-die die head and cast sheet, subsequently by vertical, cross directional stretch, thermal finalization handle, loose, traction and rolling make.For reaching low requirement of shrinking, in manufacturing process, carry out longitudinal stretching earlier, carry out cross directional stretch again, make the polyester molecule chain orientation.But in loose technology to film, its horizontal percent thermal shrinkage can reach smaller value, but vertically percent thermal shrinkage is usually more than 1.0%, shrinkage factor is not significantly descended, therefore the inconsistent meeting of shrinkage factor of film vertical and horizontal makes troubles for the production and the processing of subsequent product, causes great influence also can for simultaneously the use of end product.
Summary of the invention
The invention provides a kind of production method that can reduce the thick low hot shrinkage rate polyester film of vertical percent thermal shrinkage.
The present invention is that the technical scheme that achieves the above object is: a kind of production method of thick low hot shrinkage rate polyester film is characterized in that:
(1), fusion, extrudes: dried polyester raw material is sent into fusion in the extruder, extruded sheet through melt pipe, thick fine filter and die head, depanning die head temperature when extruding sheet is controlled at 280 ℃-295 ℃, linear velocity when sheet is extruded is controlled at 0.1m/s-0.3m/s, with the slab roller and the cold wind that are lower than 40 ℃ of temperature sheet is cooled off;
(2), longitudinal stretching, loose, typing: sheet carries out preheating through the roller by 60 ℃ of-80 ℃ of temperature after the stripper roll, enter 110 ℃～150 ℃ infrared ray thermal treatment zone heating, and at linear velocity, the 2.0-3.5 of 0.2m/s-1.1m/s: carry out longitudinal stretching under 1 the vertical stretching ratio, time is less than 0.5s, undertaken vertically loosely again by the roller that is lower than the longitudinal stretching linear velocity, prepare cross directional stretch with the roller typing diaphragm that is lower than 75 ℃ of temperature subsequently;
(3), cross directional stretch, loose, typing: two side forms are clamped the both sides of diaphragm, send in the heating cabinet and carry out preheating with 100 ℃-150 ℃ temperature, time is controlled at 10s-60s, again 110 ℃-160 ℃ temperature, 3.0～5.0: carry out cross directional stretch under 1 the horizontal stretching ratio, time is controlled at 10s-60s, it is loose simultaneously diaphragm to be carried out vertical and horizontal subsequently, finalizes the design under 200 ℃-250 ℃ temperature again, and the time is controlled at 10s-80s;
(4), loose, typing: diaphragm cools off by the roller that is lower than horizontal draw line speed and is lower than 60 ℃ of temperature, roller 110 ℃ of-160 ℃ of temperature heats diaphragm again, vertically loose after diaphragm carried out, at last with being lower than the roller of 60 ℃ of temperature to the diaphragm cooling and shaping;
(5), sided corona treatment: membrane surface is carried out high-voltage corona handle;
(6), rolling: wind-up roll is with vertical loose linear velocity coiling diaphragm after being lower than, and the tension force of diaphragm is controlled at 100-250N.
The present invention is in the longitudinal stretching process, diaphragm after stretching is carried out vertically loose typing more earlier, and in the cross directional stretch process, also be that behind cross directional stretch diaphragm to be carried out vertical and horizontal simultaneously loose, carry out high-temperature shaping again, on distraction procedure, again diaphragm is heated afterwards, make do not obtain fully as yet loose strand can in the longitudinal traction process, further obtain loose, after cooling and shaping is made the low thermal shrinkage polyester film.The present invention has all increased loose operation in longitudinal stretching and cross directional stretch process, therefore can obviously reduce vertical shrinkage factor of film, makes the shrinkage factor of the vertical and horizontal of thick low hot shrinkable polyester film reach basically identical.Its transverse modulus of elasticity of heavy duty polyester film of producing by production method of the present invention is greater than 4500Mpa, longitudinal modulus of elasticity is greater than 4000Mpa, and vertically percent thermal shrinkage is at 150 ℃, under 30 minutes less than 0.6%, laterally percent thermal shrinkage is at 150 ℃, under 30 minutes less than 0.6%.
The specific embodiment
Embodiment 1
The present invention produces thick low hot shrinkage rate polyester film, carries out according to the following steps.
(1), adopt direct esterification technology to prepare pure polyester slice and contain antiblocking agent as polyester masterbatch.With TPA and EG by 1: 1.1-1: 2.0 molar ratio mixes, and adds and contains SiO
2Ethylene glycol suspension and catalyst, stabilizing agent carry out esterification, wherein SiO
2Mass fraction be 0.01%-0.8%, at 260 ℃-290 ℃, vacuum 10pa-70pa, carry out polycondensation reaction under the reaction time 2-3h then, make the polyester slice raw material.Polyester raw material after drying, the polyester raw material that moisture is lower than 30ppm is sent into fusion in the extruder, extrude sheet through melt pipe, coarse filter, fine filter and die head, the temperature of die head is controlled at 280 ℃-285 ℃ when extruding sheet, the linear velocity of sheet is controlled at 0.1m/s-0.2m/s when extruding, and with the slab roller and the cold wind that are lower than 40 ℃ of temperature sheet is cooled off.
(2), longitudinal stretching, loose, typing: sheet is peeled off through stripper roll, roller by 70 ℃ of-75 ℃ of temperature carries out preheating, heat the infrared ray thermal treatment zone that sheet is entered 130 ℃-150 ℃, linear velocity at 0.2m/s-0.5m/s, 2.0-2.5: 1 vertical stretching ratio carries out longitudinal stretching, time is controlled at heats longitudinal stretching in the 0.5s, undertaken vertically loose by the roller that is lower than the longitudinal stretching linear velocity again, vertically loose linear velocity is 0.975-0.98 with the linear velocity ratio of longitudinal stretching: 1, with the roller typing diaphragm that is lower than 65 ℃ of-75 ℃ of temperature, prepare cross directional stretch subsequently.
(3), cross directional stretch, loose, typing: two side forms are clamped the both sides of diaphragm, send in the heating cabinet preheating temperature with 100 ℃-110 ℃, time is controlled at 50s-60s, temperature, 3.0-3.5 at 130 ℃-150 ℃: 1 horizontal stretching ratio carries out cross directional stretch, time is controlled at 50s-60s, simultaneously diaphragm is carried out the two-way loose of vertical and horizontal subsequently, finalize the design under 200 ℃ of-210 ℃ of temperature, the time is controlled at 70s-80s.
(4), loose, typing: diaphragm cools off by the roller that is lower than horizontal draw line speed and is lower than 60 ℃ of temperature, roller 140 ℃ of-150 ℃ of temperature heats diaphragm, and it is vertically loose after diaphragm carried out, roller through being lower than 60 ℃ of temperature is to the diaphragm cooling and shaping again, and the linear velocity of loose, typing and the linear velocity of cross directional stretch are than being 0.975-0.98: 1.
(5), sided corona treatment: again membrane surface is carried out high-voltage corona and handle.
(6), rolling: wind-up roll is to be lower than vertically loose linear velocity coiling diaphragm of back, this moment, the linear velocity of wind-up roll was 0.975-0.98 with the back vertically ratio of loose linear velocity: 1, and the tension force of diaphragm is controlled at 200-250N, makes the thick low hot shrinkage factor polyester film of 0.35mm at last.
Embodiment 2
The present invention produces thick low hot shrinkage rate polyester film, carries out according to the following steps.
(1), after the polyester raw material drying, the polyester raw material that moisture is lower than 40ppm is sent into fusion in the extruder, extrude sheet through melt pipe, coarse filter, fine filter and die head, the temperature of depanning die head is controlled at 285 ℃-290 ℃ when extruding sheet, the linear velocity of sheet is controlled at 0.15m/s-0.2m/s when extruding, and with the slab roller and the cold wind of 30 ℃ of temperature sheet is cooled off.
(2), longitudinal stretching, loose, typing: sheet is peeled off through stripper roll, roller by 75 ℃ of-80 ℃ of temperature carries out preheating, sheet enters 120 ℃-140 ℃ infrared ray thermal treatment zone heating, linear velocity at 0.38m/s-0.56m/s, 2.5-2.8: 1 vertical stretching ratio carries out longitudinal stretching, time is controlled at carries out longitudinal stretching in the 0.4s, undertaken vertically loose by the roller that is lower than the longitudinal stretching linear velocity again, linear velocity that should be vertically loose is 0.98-0.99 with the linear velocity ratio of longitudinal stretching: 1, with the roller typing diaphragm of 55 ℃ of-65 ℃ of temperature, prepare cross directional stretch subsequently.
(3), cross directional stretch, loose, typing: two side forms are clamped the both sides of diaphragm, send in the heating cabinet preheating temperature with 120 ℃-130 ℃, time is controlled at 40s-50s, again at 140 ℃-160 ℃ temperature, 3.5-4.0: 1 horizontal stretching ratio carries out cross directional stretch, time is controlled at 40s-50s, it is loose simultaneously diaphragm to be carried out vertical and horizontal subsequently, finalizes the design under 210 ℃-220 ℃ temperature again, and the time is controlled at 60s-70s.
(4), loose, typing: diaphragm cools off by the roller that is lower than horizontal draw line speed and is lower than 40 ℃ of temperature, roller with 150 ℃ of-160 ℃ of temperature heats diaphragm, and it is vertically loose after diaphragm carried out, again through the roller of 45 ℃ of-50 ℃ of temperature to the diaphragm cooling and shaping, the linear velocity of loose, typing and the linear velocity of cross directional stretch are than being 0.98-0.99: 1.
(5), sided corona treatment: again membrane surface is carried out high-voltage corona and handle.
(6), rolling: wind-up roll is to be lower than vertically loose linear velocity coiling diaphragm of back, this moment, the linear velocity of wind-up roll was 0.98-0.99 with the back vertically ratio of loose linear velocity: 1, and the tension force of diaphragm is controlled at 150N-200N, makes the thick low hot shrinkage factor polyester film of 0.3mm at last.
Embodiment 3
The present invention produces thick low hot shrinkage rate polyester film, carries out according to the following steps.
(1), polyester raw material after drying, the polyester raw material that moisture is lower than 40ppm is sent into fusion in the extruder, extrude sheet through melt pipe, coarse filter, fine filter and die head, the temperature of depanning die head is controlled at 290 ℃-295 ℃ when extruding sheet, the linear velocity of sheet is controlled at 0.15m/s-0.2m/s when extruding, and with the slab roller and the cold wind of 30 ℃ of temperature sheet is cooled off.
(2), longitudinal stretching, loose, typing: sheet is peeled off through stripper roll, roller by 75 ℃ of-80 ℃ of temperature carries out preheating, sheet enters 120 ℃-140 ℃ infrared ray thermal treatment zone heating, linear velocity with 0.38m/s-0.56m/s, 2.5-2.8: 1 vertical stretching ratio carries out longitudinal stretching, time is controlled at carries out longitudinal stretching in the 0.3s, undertaken vertically loose by the roller that is lower than the longitudinal stretching linear velocity again, linear velocity that should be vertically loose is 0.99-0.995 with the linear velocity ratio of longitudinal stretching: 1, with the roller typing diaphragm of 50 ℃ of-65 ℃ of temperature, prepare cross directional stretch subsequently.
(3), cross directional stretch, loose, typing: two side forms are clamped the both sides of diaphragm, send in the heating cabinet preheating temperature with 120 ℃-130 ℃, time is controlled at 40s-50s, again at 140 ℃-160 ℃ temperature, 3.5-4.0: 1 horizontal stretching ratio carries out cross directional stretch, time is controlled at 40s-50s, it is loose simultaneously diaphragm to be carried out vertical and horizontal subsequently, finalizes the design under 210 ℃ of-220 ℃ of temperature again, and the time is controlled at 60s-70s.
(4), loose, typing: diaphragm is by being lower than horizontal draw line speed and cooling off at the roller that is lower than 40 ℃ of temperature, roller with 140 ℃ of-150 ℃ of temperature heats diaphragm, and it is vertically loose after diaphragm carried out, again through the roller of 45 ℃ of-50 ℃ of temperature to the diaphragm cooling and shaping, the linear velocity of loose, typing and the linear velocity of cross directional stretch are than being 0.99-0.995: 1.
(5), sided corona treatment: again membrane surface is carried out high-voltage corona and handle.
(6), rolling: wind-up roll is to be lower than vertically loose linear velocity coiling diaphragm of back, this moment, the linear velocity of wind-up roll was 0.99-0.995 with the back vertically ratio of loose linear velocity: 1, and the tension force of diaphragm is controlled at 150N-200N, makes the thick low hot shrinkage factor polyester film of 0.25mm at last.
Embodiment 4
The present invention produces thick low hot shrinkage rate polyester film, carries out according to the following steps.
(1), after the polyester raw material drying, the polyester raw material that moisture is lower than 40ppm is sent into fusion in the extruder, extrude sheet through melt pipe, coarse filter, fine filter and die head, the temperature of depanning die head is controlled at 290 ℃-295 ℃ when extruding sheet, the linear velocity of sheet is controlled at 0.2m/s-0.25m/s when extruding, and with the slab roller and the cold wind of 35 ℃ of temperature sheet is cooled off.
(2), longitudinal stretching, loose, typing: sheet is peeled off through stripper roll, roller by 65 ℃ of-75 ℃ of temperature carries out preheating, sheet enters 130 ℃-140 ℃ infrared ray thermal treatment zone heating, linear velocity at 0.5m/s-0.88m/s, 2.5-3.2: 1 vertical stretching ratio carries out longitudinal stretching, time is no more than 0.3s and carries out longitudinal stretching, undertaken vertically loose by the roller that is lower than the longitudinal stretching linear velocity again, linear velocity that should be vertically loose is 0.975-0.985 with the linear velocity ratio of longitudinal stretching: 1, with the roller typing diaphragm that is lower than 60 ℃ of-70 ℃ of temperature, prepare cross directional stretch subsequently.
(3), cross directional stretch, loose, typing: two side forms are clamped the both sides of diaphragm, send into preheating under 130 ℃-150 ℃ temperature in the heating cabinet, time is controlled at 20s-50s, again at 120 ℃-130 ℃ temperature, 3.5-4.5: 1 horizontal stretching ratio carries out cross directional stretch, time is controlled at 20s-50s, it is loose simultaneously diaphragm to be carried out vertical and horizontal subsequently, finalizes the design under 230 ℃ of-240 ℃ of temperature again, and the time is controlled at 40s-60s.
(4), loose, typing: diaphragm is by being lower than horizontal draw line speed and cooling off at the roller that is lower than 40 ℃ of temperature, roller through 130 ℃ of-140 ℃ of temperature heats diaphragm again, and it is vertically loose after diaphragm carried out, again through the roller of 45 ℃ of-50 ℃ of temperature to the diaphragm cooling and shaping, the linear velocity of loose, typing and the linear velocity of cross directional stretch are than being 0.975-0.985: 1.
(5), sided corona treatment: again membrane surface is carried out high-voltage corona and handle.
(6), rolling: wind-up roll is to be lower than vertically loose linear velocity coiling diaphragm of back, this moment, the linear velocity of wind-up roll was 0.975-0.985 with the back vertically ratio of loose linear velocity: 1, and the tension force of diaphragm is controlled at 120N-180N, makes the thick low hot shrinkage factor polyester film of 0.20mm at last.
Embodiment 5
The present invention produces thick low hot shrinkage rate polyester film, carries out according to the following steps.
(1), after the polyester raw material drying, the polyester raw material that moisture is lower than 40ppm is sent into fusion in the extruder, extrude sheet through melt pipe, coarse filter, fine filter and die head, the temperature of depanning die head is controlled at 290 ℃-295 ℃ when extruding sheet, the linear velocity of sheet is controlled at 0.25m/s-0.3m/s when extruding, and with the slab roller and the cold wind of 30 ℃ of temperature sheet is cooled off.
(2), longitudinal stretching, loose, typing: sheet is peeled off through stripper roll, roller by 65 ℃ of-70 ℃ of temperature carries out preheating, sheet enters 110 ℃-130 ℃ infrared ray thermal treatment zone heating, with linear velocity, the 3.0-3.2 at 0.75m/s-0.96m/s: 1 vertical stretching ratio, time is no more than 0.3s and carries out longitudinal stretching, undertaken vertically loose by the roller that is lower than the longitudinal stretching linear velocity again, linear velocity that should be vertically loose is 0.985-0.995 with the linear velocity ratio of longitudinal stretching: 1, with the roller typing diaphragm of 40 ℃ of-50 ℃ of temperature, prepare cross directional stretch subsequently.
(3), cross directional stretch, loose, typing: two side forms are clamped the both sides of diaphragm, send in the heating cabinet preheating temperature with 140 ℃-150 ℃, time is controlled at 30s-60s, again at 110 ℃-130 ℃ temperature, 4.0-5.0: 1 horizontal stretching ratio carries out cross directional stretch, time is controlled at 30s-60s, it is loose simultaneously diaphragm to be carried out vertical and horizontal subsequently, finalizes the design under 240 ℃ of-250 ℃ of temperature again, and the time is controlled at 40s-60s.
(4), loose, typing: diaphragm cools off by the roller that is lower than horizontal draw line speed and is lower than 40 ℃ of temperature, roller through 150 ℃ of-160 ℃ of temperature heats diaphragm again, and vertically loose after diaphragm carried out, vertically loose after again through the roller of 35 ℃ of-45 ℃ of temperature to the diaphragm cooling and shaping.The linear velocity of linear velocity and the cross directional stretch of loose, typing is than being 0.985-0.995: 1.
(5), sided corona treatment: again membrane surface is carried out high-voltage corona and handle.
(6), rolling: wind-up roll is to be lower than vertically loose linear velocity coiling diaphragm of back, this moment, the linear velocity of wind-up roll was 0.985-0.995 with the back vertically ratio of loose linear velocity: 1, and the tension force of diaphragm is controlled at 120N-160N, makes the thick low hot shrinkage factor polyester film of 0.15mm at last.
Embodiment 6
The present invention produces thick low hot shrinkage rate polyester film, carries out according to the following steps.
(1), after the polyester raw material drying, the polyester raw material that moisture is lower than 40ppm is sent into fusion in the extruder, extrude sheet through melt pipe, coarse filter, fine filter and die head, the temperature of depanning die head is controlled at 285 ℃-290 ℃ when extruding sheet, the linear velocity of sheet is controlled at 0.25m/s-0.3m/s when extruding, and with the slab roller and the cold wind of 35 ℃ of temperature sheet is cooled off.
(2), longitudinal stretching, loose, typing: sheet is peeled off through stripper roll, roller by 60 ℃ of-65 ℃ of temperature carries out preheating, sheet enters 110 ℃-130 ℃ infrared ray thermal treatment zone heating, linear velocity, 3.2-3.5 at 0.8m/s-1.1m/s: 1 vertical stretching ratio, time is no more than 0.4s and carries out longitudinal stretching, undertaken vertically loose by the roller that is lower than the longitudinal stretching linear velocity again, linear velocity that should be vertically loose is 0.985-0.99 with the linear velocity ratio of longitudinal stretching: 1, with the roller typing diaphragm of 45 ℃ of-55 ℃ of temperature, prepare cross directional stretch subsequently.
(3), cross directional stretch, loose, typing: two side forms are clamped the both sides of diaphragm, send in the heating cabinet preheating temperature with 130 ℃-150 ℃, time is controlled at 30s-50s, again at 110 ℃-130 ℃ temperature, 4.0-5.0: 1 horizontal stretching ratio carries out cross directional stretch, time is controlled at 30s-50s, it is loose simultaneously diaphragm to be carried out vertical and horizontal subsequently, finalizes the design under 240 ℃ of-250 ℃ of temperature again, and the time is controlled at 40s-50s.
(4), loose, typing: diaphragm is by being lower than horizontal draw line speed and cooling off at the roller that is lower than 40 ℃ of-50 ℃ of temperature, roller through 110 ℃ of-120 ℃ of temperature heats diaphragm, and it is vertically loose after diaphragm carried out, again through the roller of 35 ℃ of-45 ℃ of temperature to the diaphragm cooling and shaping, the linear velocity of loose, typing and the linear velocity of cross directional stretch are than being 0.985-0.99: 1.
(5), sided corona treatment: again membrane surface is carried out high-voltage corona and handle.
(6), rolling: wind-up roll is to be lower than vertically loose linear velocity coiling diaphragm of back, this moment, the linear velocity of wind-up roll was 0.99-0.995 with the back vertically ratio of loose linear velocity: 1, and the tension force of diaphragm is controlled at 100N-150N, makes the thick low hot shrinkage factor polyester film of 0.10mm at last.
The present invention tests the thick low hot shrinkage factor polyester film of the above embodiments, see Table 1 its transverse modulus of elasticity greater than 4500Mpa, longitudinal modulus of elasticity is greater than 4000Mpa, vertically percent thermal shrinkage is at 150 ℃, under 30 minutes less than 0.6%, laterally percent thermal shrinkage is less than at 150 ℃, under 30 minutes less than 0.6%, vertically shrinkage factor near or equal lateral shrinkage.
Table 1
| Index | Unit | Embodiment | Method of testing | ||||||
| 1 | 2 | 3 | 4 | 5 | 6 | ||||
| Thickness | mm | 0.35 | 0.3 | 0.25 | 0.2 | 0.15 | 0.1 | GB/T12802 .2-2004 | |
| Mist degree | ％ | 4.5 | 4.1 | 4.0 | 3.8 | 3.7 | 3.4 | GB/T12802 .2-2004 | |
| Hot strength | Vertically | Mpa | 140 | 150 | 150 | 160 | 170 | 175 | GB/T12802 .2-2004 |
| Laterally | 170 | 180 | 180 | 185 | 190 | 195 | |||
| Tensile modulus of elasticity | Vertically | Mpa | 4060 | 4100 | 4100 | 4170 | 4200 | 4250 | GB/T12802 .2-2004 |
| Laterally | 4560 | 4600 | 4560 | 4600 | 4800 | 5100 | |||
| Percent thermal shrinkage | Vertically | ％ | 0.5 | 0.5 | 0.6 | 0.6 | 0.6 | 0.4 | 150 ℃，30min |
| Laterally | 0.4 | 0.4 | 0.6 | 0.6 | 0.5 | 0.5 | |||
Claims (7)
1. the production method of a thick low hot shrinkage rate polyester film is characterized in that:
(1), fusion, extrudes: dried polyester raw material is sent into fusion in the extruder, extruded sheet through melt pipe, thick fine filter and die head, depanning die head temperature when extruding sheet is controlled at 280 ℃-295 ℃, linear velocity when sheet is extruded is controlled at 0.1m/s-0.3m/s, with the slab roller and the cold wind that are lower than 40 ℃ of temperature sheet is cooled off;
(2), longitudinal stretching, loose, typing: sheet carries out preheating through the roller by 60 ℃ of-80 ℃ of temperature after the stripper roll, enter 110 ℃～150 ℃ infrared ray thermal treatment zone heating, linear velocity, 2.0～3.5 with 0.2m/s-1.1m/s: carry out longitudinal stretching under 1 the vertical stretching ratio, time is less than 0.5s, undertaken vertically loosely again by the roller that is lower than the longitudinal stretching linear velocity, prepare cross directional stretch with the roller typing diaphragm that is lower than 75 ℃ of temperature subsequently;
(3), cross directional stretch, loose, typing: two side forms are clamped the both sides of diaphragm, send in the heating cabinet and under 100 ℃-150 ℃ temperature, carry out preheating, time is controlled at 10s-60s, again 110 ℃-160 ℃ temperature, 3.0～5.0: carry out cross directional stretch under 1 the horizontal stretching ratio, time is controlled at 10s-60s, it is loose simultaneously diaphragm to be carried out vertical and horizontal subsequently, finalizes the design under 200 ℃-250 ℃ temperature again, and the time is controlled at 10s-80s;
(4), loose, typing: diaphragm cools off by the roller that is lower than horizontal draw line speed and is lower than 60 ℃ of temperature, roller 110 ℃ of-160 ℃ of temperature heats diaphragm again, vertically loose after diaphragm carried out, at last with being lower than the roller of 60 ℃ of temperature to the diaphragm cooling and shaping;
(5), sided corona treatment: membrane surface is carried out high-voltage corona handle;
(6), rolling: wind-up roll is with vertical loose linear velocity coiling diaphragm after being lower than, and the tension force of diaphragm is controlled at 100-250N.
2. the production method of thick low hot shrinkage rate polyester film according to claim 1, it is characterized in that: the described linear velocity of extruding sheet is controlled between the 0.15m/s-0.2m/s.
3. the production method of thick low hot shrinkage rate polyester film according to claim 1 is characterized in that: the linear velocity of described vertically loose linear velocity and longitudinal stretching is than being 0.975-0.995: 1.
4. the production method of thick low hot shrinkage rate polyester film according to claim 1 is characterized in that: the linear velocity of the vertically loose linear velocity in described back and cross directional stretch is than being 0.975-0.995: 1.
5. the production method of thick low hot shrinkage rate polyester film according to claim 1, it is characterized in that: described vertical stretching ratio is 2.5-3.2: 1, horizontal stretching ratio is 3.5-4.5: 1.
6. the production method of thick low hot shrinkage rate polyester film according to claim 1, it is characterized in that: during described longitudinal stretching after the roller of 65 ℃ of-75 ℃ of temperature carries out preheating, 120 ℃-140 ℃ infrared ray thermal treatment zone heating, heat time heating time is less than 0.3s again.
7. the production method of thick low hot shrinkage rate polyester film according to claim 1, it is characterized in that: the preheating under 110 ℃ of-140 ℃ of temperature of described cross directional stretch, time is controlled at 20s-50s, carries out cross directional stretch again under 120 ℃-150 ℃ temperature, and the time is controlled at 20s-50s.
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