CN103737937B - A kind of processing method improving polyester thermal contraction film longitudinal tensile strength - Google Patents
A kind of processing method improving polyester thermal contraction film longitudinal tensile strength Download PDFInfo
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- CN103737937B CN103737937B CN201310616474.4A CN201310616474A CN103737937B CN 103737937 B CN103737937 B CN 103737937B CN 201310616474 A CN201310616474 A CN 201310616474A CN 103737937 B CN103737937 B CN 103737937B
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- 229920000728 polyester Polymers 0.000 title claims abstract description 51
- 230000008602 contraction Effects 0.000 title claims abstract description 49
- 238000003672 processing method Methods 0.000 title claims abstract description 16
- 239000000463 material Substances 0.000 claims abstract description 15
- 238000001125 extrusion Methods 0.000 claims abstract description 7
- 238000005098 hot rolling Methods 0.000 claims abstract description 6
- 238000009966 trimming Methods 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 238000005096 rolling process Methods 0.000 claims abstract description 5
- 230000004927 fusion Effects 0.000 claims abstract description 4
- 239000000155 melt Substances 0.000 claims abstract description 3
- 238000005516 engineering process Methods 0.000 claims description 15
- 238000007766 curtain coating Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 23
- 230000008569 process Effects 0.000 description 13
- 229920006267 polyester film Polymers 0.000 description 9
- 229920006300 shrink film Polymers 0.000 description 9
- -1 polyethylene Polymers 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000001965 increasing effect Effects 0.000 description 5
- 238000011160 research Methods 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000011056 performance test Methods 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004513 sizing Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 238000009998 heat setting Methods 0.000 description 2
- QQVIHTHCMHWDBS-UHFFFAOYSA-L isophthalate(2-) Chemical compound [O-]C(=O)C1=CC=CC(C([O-])=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-L 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
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- 238000012360 testing method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229920002799 BoPET Polymers 0.000 description 1
- 239000005041 Mylar™ Substances 0.000 description 1
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
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- 239000000126 substance Substances 0.000 description 1
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- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
A kind of processing method improving polyester thermal contraction film longitudinal tensile strength, materials requirement according to polyester thermal contraction film, by main and auxiliary machine material formula, main and auxiliary machine blanking parameter is configured, makes material after tentatively mixing, respectively enter twin screw vented extruders plastifying fusion through blender；Melt flow stream is through reverse-flow type fine filter, extrude through die head again, the melt of extrusion is cast on chilling roller and is cooled into slab, slab is preheated by five pre-hot-rollings in longitudinal stretching equipment by traction apparatus, in longitudinal stretching equipment, carry out little multiplying power small-gap suture multiple spot by five draw rolls stretch, in longitudinal stretching equipment, thermal finalization is completed again by five setting rolls, enter in transverse stretching equipment and preheat, stretching ratio with 3 4.5 stretches in transverse stretching equipment, transverse stretching equipment is shaped, trimming, rolling；Described little multiplying power refers to that the stretching ratio in longitudinal stretching direction is 1.01 1.2, and small-gap suture refers to that the gap between draw roll is 4mm 8mm.
Description
Technical field
The present invention relates to a kind of processing method improving polyester thermal contraction film longitudinal direction hot strength.
Background technology
Along with the fast development of market economy, particularly packaging industry and false proof industry are to the demand of thermal contractive label and day
All increasings, China's domestic thermal contractive label market, it was always maintained at the good momentum of sustainable growth, average growth rate per annum in recent years
Be held in 15%～about 20%, this quick growth be other packages printing industry incomparable.Now along with people
The class urgent needs to ep-type material, is greatly facilitated polyester thermal contraction film application in the market.
It is understood that its contraction of heat shrink films as label requires to be unidirectional contraction, cause polyester heat based on this requirement
The problems such as shrink film exists the problem that longitudinal stretching is easily broken, causes later stage film printing to break film, the set disconnected mark of mark, have a strong impact on life
Produce efficiency, all bring certain economic loss and waste of material to film base material supplier and client thereof.
Its key property of thermal contracting polyester film now is the most satisfactory, such as stable contraction rate, environment-friendly type energy
Good, excellent optical performance, only its mechanical property aspect are unsatisfactory, owing to label heat shrink films draws for the most unidirectional
Stretch, cause its transverse tensile strength higher, and longitudinal tensile strength is the lowest, easily broken.
Summary of the invention
According to the problems referred to above technical issues that need to address of the present invention it is: based on polyester thermal contraction film longitudinal direction mechanics now
Weak point present on performance, it is provided that a kind of transverse tensile strength is high, and the good shrinkage factor of longitudinal direction hot strength is steady
Fixed, the good polyester thermal contraction film of surface printability.It is an object of the invention to provide a kind of simple, there is the suitable of universality
A kind of method improving longitudinal tensile strength in polyester thermal contraction film.
A kind of processing method improving polyester thermal contraction film longitudinal tensile strength, it is characterised in that: according to polyester thermal contraction film
Materials requirement, by main and auxiliary machine material formula, main and auxiliary machine blanking parameter is configured, at the beginning of blender makes material
Twin screw vented extruders plastifying fusion is respectively enterd after step mixing；Melt flow stream filters off miscellaneous through reverse-flow type fine filter
After matter, melt flow stream is extruded through die head, and the melt of extrusion is cast on chilling roller and is cooled into slab, and then slab is led to
Cross traction apparatus to be preheated by five pre-hot-rollings in longitudinal stretching equipment, then by five in longitudinal stretching equipment
Individual draw roll carries out the stretching of little multiplying power small-gap suture multiple spot, then completes thermal finalization by five setting rolls in longitudinal stretching equipment,
Subsequently enter in transverse stretching equipment and preheat, stretch in transverse stretching equipment with the stretching ratio of 3-4.5, laterally
Stretcher is shaped, trimming, rolling；Described little multiplying power refers to that the stretching ratio in longitudinal stretching direction is 1.01-1.2,
Small-gap suture refers to that the gap between draw roll is 4mm-8mm.
Wherein, the extruder of the predrying function of twin screw band is used.
Wherein, the reverse-flow type fine filter of bottom in and top out structural formula is used.
Wherein, multi-drawing technology is used during cross directional stretch.
Wherein, extruder temperature is 265-285 DEG C.
Wherein, die head temperature is 270-280 DEG C.
Wherein, melt extrusion is cooled into slab with 25-50 DEG C of curtain coating on chilling roller.
Wherein, slab by traction apparatus in longitudinal stretching equipment by five pre-hot-rollings with 95-100 DEG C of preheating, then
At 75-82 DEG C in longitudinal stretching equipment, carry out little multiplying power small-gap suture multiple spot by five draw rolls and stretch, then by five
Setting roll is with 100-110 DEG C of thermal finalization in longitudinal stretching equipment.
Wherein, after thermal finalization, preheat with 95-105 DEG C in transverse stretching equipment, with 70-77 DEG C at cross directional stretch
Equipment is shaped, carries out trimming, rolling at 20-40 DEG C.
For solving above-mentioned technical problem, the following key technology of the present invention:
1, preferred twin screw band predrying function extruder, removes drying mode required during single screw rod production and processing, both warps from
Ji reduces again the physical damage brought in dry run to raw material.
2, the reverse-flow type fine filter that preferred market can be bought: such filtration device structure is bottom in and top out structure, permissible
Realize need not aborning interrupt extrusion, only need to change discharging orientation by rotating reversal valve, so that it may be automatically performed
The switch operating of fondant filter, thus improve production efficiency, reduce the waste of raw material, cost-effective.
3, longitudinal thermal finalization technology: in longitudinal stretching equipment will quickly slab after cooling carry out preheating, little of little multiplying power
It is re-fed in transverse stretching equipment after the stretching of gap multiple spot, thermal finalization, can effectively eliminate polyester film by longitudinal thermal finalization and exist
The internal stress produced in longitudinal stretching process, it is ensured that polyester film does not longitudinally shrink.
In above-mentioned key technology, described longitudinal thermal finalization technology uses the stretching of little multiplying power small-gap suture multiple spot and heat is fixed
Type technology.Bigger stretching ratio can improve the vertical mixing coefficient of polyester film, but does not allows in longitudinal heat setting process
Easily eliminate the internal stress that film produces in drawing process, cause film longitudinal direction percent thermal shrinkage to exceed standard, it is impossible to enough to meet it as heat
The contraction requirement of shrink label.If but not carrying out longitudinal stretching and certainly will cause low, the easily broken phenomenon of longitudinal film hot strength.
As the requirement of label shrink film but also the spy that it is carried out by longitudinal this research of hot strength of polyester film is increased for not only meeting it
Study carefully.Research finds: by increasing longitudinal stretching equipment, carries out little multiplying power small-gap suture multiple spot pulling method, then by longitudinally
Heat setting process, can effectively eliminate the internal stress that polyester film produces in drawing process, optimizes polyester interior molecules knot
Structure, it is ensured that polyester film does not longitudinally shrink, and its hot strength of the polyester film after certain draw ratio has certain increasing
Add, thus make up the deficiency of polyester thermal contraction film longitudinal direction terms of mechanics.
Investigative technique is analyzed: be longitudinally fixed in process of production generally, for current unidirectional polyester thermal contraction film
Type technique, thus cause polyester thermal contraction film the most easily broken, hot strength is the lowest, and some polyester thermal contraction film is at warp
The phenomenon that longitudinal stretching breaks entirely even occurs after placement after a while, causes polyester thermal contraction film storge quality poor.
For solving this technological deficiency, different manufacturers also make great efforts to study its solution, as add toughener, modifying agent and
Improving cross directional stretch technique etc., but it is the worst to improve effect, it is impossible to tackle the problem at its root, my company is through concentrating on studies
Find to add longitudinal tensile fixture before transverse stretching equipment device, just can reach enhancing by easy longitudinal stretching equipment
The effect of longitudinal tensile strength.
The stretching of above-mentioned what is called noted herein little multiplying power small-gap suture multiple spot refers to: between so-called small-gap suture refers between draw roll
Gap is the least, and my company is set to 4mm-8mm, and otherwise stretching spacing conference causes film constriction amount big.Little multiplying power refers to longitudinal direction
Stretching ratio is the least, and for the stretching ratio of 1.01-1.5, one is because stretching ratio crosses conference and cause when thermal finalization processes
The bigger internal stress that produce cannot be completely eliminated in drawing process, and cause longitudinal contraction rate to exceed standard and do not reach customer requirement；
Two to be because thermal contractive label requirement be simple tension, does not increase the necessity of the biggest draw ratio.Multiple spot stretching refers to
Use five draw rolls that polyester carries out multi-drawing, thus ensure that stretching is uniformly.
Stablizing in order to ensure lateral shrinkage simultaneously, this research realizes horizontal multi-drawing by increasing stretch zones, this
Invention uses cross directional stretch section length to be 10 meters and progressively stretches to ensure that cross directional stretch is uniform, and level of stretch is big, thus
Guarantee that lateral shrinkage is big and it is stable to shrink.
The method have the benefit that
The present invention, according to the contraction principle of heat shrink films, utilizes aforesaid equipment and moulding process, and working out one can have
Effect improves the method for polyester thermal contraction film longitudinal tensile strength.The method has a beneficial effect in detail below:
The present invention can use longitudinal thermal finalization technology and horizontal multi-drawing technology to control accurately by repeatedly putting into practice discovery
The polymer processed stretching in the course of processing, setting process link, thus it is effectively improved longitudinal hot strength.Research is sent out
The longitudinal hot strength of the polyester thermal contraction film that now uses this production technology to prepare all can reach 260N/mm2Above, laterally
Hot strength is up to 300N/mm2Above, and percent thermal shrinkage is stably, other function admirables.
Accompanying drawing explanation
Fig. 1 is longitudinal stretching apparatus sketch of the present invention；
Fig. 2 is transverse stretching equipment sketch of the present invention；
Fig. 3 is many samples longitudinal direction amorphous polyester heat shrink films thermal contraction curve chart (water-bath 95 DEG C, 10s).
Fig. 4 is many samples longitudinal direction amorphous polyester heat shrink films tensile strength curve figure.
Detailed description of the invention
Implementation given below is the concrete detailed description to the present invention, simultaneously it is pointed out here that following implementation is to this
Being further explained in detail of secondary invention, is not to be construed as the restriction to this invention protection domain, if be familiar with in this field
Technical staff only makes the improvement on non-intrinsically safe according to present invention, will still belong to protection scope of the present invention.
Below in conjunction with detailed description of the invention, the present invention is described in detail, it is pointed out here that be merely just easy to statement to enumerate polyester heat
Shrink film a kind of preparation method therein, the present invention is a kind of improves the processing method of polyester thermal contraction film longitudinal tensile strength also
Being not limited to this formula, it is adapted to any one polyester thermal contraction film.
Test preferred several formula
Main frame: polyethylene terephthalate-1,4 cyclohexane dimethanol ester 70-90wt%, polyethylene terephthalate
Ester 10-30wt%, isophthalate modified polyethylene terephthalate 5-20wt%, according to above-mentioned mass percent model
Enclosing mixing, mass percent sum is 100wt% or polyethylene terephthalate-1,4-CHDM ester
100wt% or isophthalate modified polyethylene terephthalate 100wt%.
Subsidiary engine: polyethylene terephthalate-1,4 cyclohexane dimethanol ester 90wt%, slipping agent 6wt%, antistatic
Agent 2wt%, processing aid 2wt%, mix according to above-mentioned mass fraction, and mass percent sum is 100wt%.
This patent is not limited to above formula, and the modifying agent of polyester copolymer is not only M-phthalic acid, it is also possible to be
Other carboxylic acids graft modification agent, such as fatty acid, phthalic acid, p-phthalic acid etc..As long as polyesters thermal contraction
Film is all within this patent protection domain.
Described main and auxiliary machine all preferably twin screw vented extruders, the preferred polyethylene terephthalate-Isosorbide-5-Nitrae of described raw material-
Cyclohexanedimethanoester ester is SK Chemical of Korea S or Yi Siman film level product, and polyethylene terephthalate is armorphous bottle level
Polyester slice.
Based on above-mentioned technology, a kind of its technological process of processing method improving polyester thermal contraction film longitudinal tensile strength of the present invention
And temperature process parameter is:
By main auxiliary machine formula, main auxiliary machine blanking parameter is configured, enters double after blender makes material tentatively mix
Screw exhausting-type extruder plastifying fusion, preferred 265-285 DEG C of extruder temperature, then melt flow stream is through reverse-flow type essence mistake
Filter filters off impurity in material, and melt is extruded through die head afterwards, preferred 270-280 DEG C of die head temperature, then melt extrusion
On chilling roller, preferred 25-50 DEG C of curtain coating is cooled into slab, and then slab is led in longitudinal stretching equipment by traction apparatus
Cross preferred 95-100 DEG C of five pre-hot-rollings to preheat, then in longitudinal stretching equipment preferably 75-82 DEG C by five stretchings
Roller carries out the stretching of 1.01-1.20 little multiplying power small-gap suture multiple spot, is longitudinally being drawn by preferred 100-110 DEG C of five setting rolls afterwards
Stretch and equipment completes thermal finalization (see figure 1), be then passed through the film that longitudinal stretching crosses and enter transverse stretching equipment by chain folder
Entrance, is shown in Fig. 2, preheats in transverse stretching equipment with preferred 95-105 DEG C, with the stretching ratio of 3-4.5 laterally
Stretching in stretcher, preferably 70-77 DEG C completes sizing in transverse stretching equipment, carries out trimming, receipts at 20-40 DEG C
Volume.
Preferred 265-275 DEG C of the temperature of the most main and auxiliary machine filter and melt pipeline, line speed is preferred
40m/min～60m/min.
Described main and auxiliary machine all preferably twin screw vented extruders.The reverse-flow type essence of the preferred bottom in and top out of fine filter filters
Device, this filter is the most commercially available.
Longitudinally sizing and cross directional stretch concrete operations:
By completing warm through the thick sheet of over-quenching roller cooling molding by five each and every one high-precision metal metal rollers, anxious
Cold roller diameter is 1400mm.Then, under the velocity gradient set, the sheet material after preheating is carried out through five draw rolls
Little multiplying power small-gap suture multiple spot stretches, and then through five setting rolls, the mylar after too small multiplying power stretches is carried out heat fixed
Type, rear film enter in transverse stretching equipment and complete to preheat, stretch, shape, cool down.Concrete longitudinal stretching equipment is pre-
Hot-zone, drawing zone, shaping area see that Fig. 1, transverse stretching equipment regional are shown in Fig. 2.
Carry out the production of thermal contracting polyester film according to above-mentioned technological process, temperature parameter and equipment requirements, be given below by this
Method carries out producing the full performance test value of gained nominal thickness 40um polyester thermal contraction film and corresponding test multiple samples heat
Shrinkage factor curve, is shown in Table 1 and Fig. 3, and it is thick to be given under same formula, technique being not added with longitudinal stretching equipment gained nominal
The full performance test value of degree 40um polyester thermal contraction film, is shown in Table 2.
Table 1 40um longitudinal direction thermal finalization polyester thermal contraction film full performance test table
Table 2 40um normal polyester heat shrink films full performance test table
Being contrasted by table 1 and table 2 after can drawing the longitudinal thermal finalization technology of employing and horizontal multi-drawing technology, polyester heat is received
The mechanical property of contracting film is improved, and other performance remains on excellent.By the longitudinal direction sizing film obtained is carried out repeatedly
Sampling draws percent thermal shrinkage curve and the tensile strength curve figure of polyester thermal contraction film, sees Fig. 3 and Fig. 4, can from Fig. 3
To find out that polyester thermal contraction film is horizontal, longitudinal direction percent thermal shrinkage curve is stable, longitudinally, laterally direction shrinkage factor fluctuation width
Spending little, stable contraction rate, polyester thermal contraction film performance is optimized.As can be seen from Figure 4 polyester thermal contraction film laterally,
Longitudinal direction hot strength is the biggest, and uniformly, stably, during stretching, polyester thermal contraction film all can pass through tensile yield
Point, does not ruptures.Meanwhile, repeatedly research finds the stretching of the polyester thermal contraction film longitudinal direction using this production technology to prepare
Intensity all can reach 260N/mm2Above, transverse tensile strength is up to 300N/mm2Above, and percent thermal shrinkage is stable, its
His function admirable.
Claims (9)
1. the processing method improving polyester thermal contraction film longitudinal tensile strength, it is characterized in that: according to the materials requirement of polyester thermal contraction film, by main and auxiliary machine material formula, main and auxiliary machine blanking parameter is configured, makes material after tentatively mixing, respectively enter twin screw vented extruders plastifying fusion through blender；Melt flow stream is after reverse-flow type fine filter filters off impurity, melt flow stream is extruded through die head, the melt of extrusion is cast on chilling roller and is cooled into slab, then slab is preheated by five pre-hot-rollings in longitudinal stretching equipment by traction apparatus, then in longitudinal stretching equipment, carry out little multiplying power small-gap suture multiple spot by five draw rolls to stretch, in longitudinal stretching equipment, thermal finalization is completed again by five setting rolls, subsequently enter in transverse stretching equipment and preheat, use cross directional stretch section length to be 10 meters progressively to stretch, stretch in transverse stretching equipment with the stretching ratio of 3-4.5, transverse stretching equipment is shaped, trimming, rolling；Described little multiplying power refers to that the stretching ratio in longitudinal stretching direction is 1.01-1.2, and small-gap suture refers to that the gap between draw roll is 4mm-8mm.
A kind of processing method improving polyester thermal contraction film longitudinal tensile strength, it is characterised in that use the extruder of the predrying function of twin screw band.
A kind of processing method improving polyester thermal contraction film longitudinal tensile strength, it is characterised in that use the reverse-flow type fine filter of bottom in and top out structural formula.
A kind of processing method improving polyester thermal contraction film longitudinal tensile strength, it is characterised in that use multi-drawing technology during cross directional stretch.
A kind of processing method improving polyester thermal contraction film longitudinal tensile strength, it is characterised in that extruder temperature is 265-285 DEG C.
A kind of processing method improving polyester thermal contraction film longitudinal tensile strength, it is characterised in that die head temperature is 270-280 DEG C.
A kind of processing method improving polyester thermal contraction film longitudinal tensile strength, it is characterised in that melt extrusion is cooled into slab with 25-50 DEG C of curtain coating on chilling roller.
A kind of processing method improving polyester thermal contraction film longitudinal tensile strength, it is characterized in that slab is passed through traction apparatus and passed through five pre-hot-rollings in longitudinal stretching equipment with 95-100 DEG C of preheating, then at 75-82 DEG C in longitudinal stretching equipment, carry out little multiplying power small-gap suture multiple spot by five draw rolls to stretch, then by five setting rolls with 100-110 DEG C of thermal finalization in longitudinal stretching equipment.
A kind of processing method improving polyester thermal contraction film longitudinal tensile strength, after it is characterized in that thermal finalization, transverse stretching equipment preheats with 95-105 DEG C, shapes in transverse stretching equipment with 70-77 DEG C, carry out trimming, rolling at 20-40 DEG C.
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| CN105774003A (en) * | 2015-12-18 | 2016-07-20 | 山东东宇鸿翔柜橱材料有限公司 | Production process of PETG high-resistance high light film |
| US10090500B2 (en) * | 2016-09-20 | 2018-10-02 | Sumitomo Chemical Company, Limited | Film-stretching apparatus and method of producing film |
| CN110571389B (en) * | 2019-08-02 | 2022-03-11 | 河北金力新能源科技股份有限公司 | Forming device and forming method for lithium battery diaphragm casting sheet |
| CN110480893B (en) * | 2019-09-16 | 2024-03-22 | 江苏光辉包装材料有限公司 | Flat membrane method polyester heat shrinkage label membrane soaking reinforced cooling treatment device |
| CN115195095A (en) * | 2022-05-17 | 2022-10-18 | 中材锂膜有限公司 | High-safety stretching device for wet-process synchronous lithium ion battery diaphragm |
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| JPH0773877B2 (en) * | 1989-11-21 | 1995-08-09 | 帝人株式会社 | Method for producing biaxially oriented polyester film |
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