CN100358614C - Manufacture process and apparatus for PTFE supported composite filtering film - Google Patents
Manufacture process and apparatus for PTFE supported composite filtering film Download PDFInfo
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- CN100358614C CN100358614C CNB2005100231933A CN200510023193A CN100358614C CN 100358614 C CN100358614 C CN 100358614C CN B2005100231933 A CNB2005100231933 A CN B2005100231933A CN 200510023193 A CN200510023193 A CN 200510023193A CN 100358614 C CN100358614 C CN 100358614C
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Abstract
The present invention discloses a manufacture method of composite polytetrafluoroethylene bracing filtering film and a manufacture device. The surface temperature for heating a composite roller is higher than the temperature of the melting point of a bracing material, and the surface temperature for cooling the composite roller is lower than the temperature of the thermal deformation of the bracing material; thus, the surface of the bracing material is partially melted, and is effectively bonded and compounded with the bracing polytetrafluoroethylene filtering film. Thereby, the method has the advantages that the bracing material can not be melted or thermally deformed, the ventilation characteristic of the microporous polytetrafluoroethylene filtering film is kept, the defects that the single microporous polytetrafluoroethylene filtering film can not be braced automatically and is easily deformed can be overcome, the single microporous polytetrafluoroethylene filtering film can be easily folded and processed into a pleat-shaped filter element, the morphological structure and the hole diameter of the original film are kept, the influence on ventilation property is little, and the shrinkage and the formability of the filtering film material are greatly improved. The composite film has the physical and chemical characteristics of good solvent resistance and high-temperature sterilization. A composite device has the advantages of compact structure and adjustable parameter, and can satisfy the requirements of continuous and composite industrial production in bulk.
Description
Technical field
The present invention relates to a kind of filter membrane, especially the manufacture method that relates to a kind of polytetrafluoroethylene (PTFE) supported composite filtering film, this composite membrane is made as a whole micropore filtering film, the aperture that has still kept original film morphosis and film, gas permeability descends few, and has improved the shrinkage and the mouldability of filter membrane material greatly.
Background technology
The polytetrafluoroethylene (PTFE) material is in macromolecular material, and performance is outstanding; High temperature resistant, acid and alkali-resistance, organic solvent have nontoxic and biocompatibility again.When the polytetrafluoroethylene (PTFE) miillpore filter of drawing and forming is used for gas or liquid filtering, have than other macromolecular material (as regenerated cellulose, nylon, Kynoar, polyether sulfone) percent opening that miillpore filter is bigger, better combination properties such as particulate obstruction and durability are the filtering materials that there is extensive use in fields such as current chemical industry, medical treatment, food, electronics.But before filter membrane is with the filter core form practical application that folds, need filter membrane is folded with the saturating amount of increase membrane area raising, and single polytetrafluoroethylene (PTFE) miillpore filter film is thin, matter is soft, yielding, can not self-supporting.The filter membrane work in-process needs the support ability moulding of one or more layers other porous material like this, but it is directly folding with backing material the polytetrafluoroethylene (PTFE) miillpore filter, folding forming difficulty not only, the percent defective height, and film and backing material break away from easily in application, influence result of use and life cycle.Therefore people consider polytetrafluoroethylene (PTFE) miillpore filter and backing material are combined with each other, but existing complex method all can't be obtained effect preferably.
Present complex method mainly contains following several, method as extensive use in textile industry with the continuous composite spinning face of gluing mode auxiliary material, printing industry use in the gluing mode and be the hot pressing overlay film of form of discontinuity, and with melt portions low melting point backing material and with the thermoplastic resin powder as adhesive hot pressing, make polytetrafluoroethylene (PTFE) film and backing material lamination, bonding etc.But above these method and apparatus all have bigger defective for the polytetrafluoroethylene (PTFE) miillpore filter with high-melting-point, non-adhesion properties, general adhesive can be blocking microporous, reduce the permeability of the effective filtration area and the goods of film greatly, but and use special adhesive or heat-fusible materials very complicated on synthetic and processing technology.These methods in actual applications in addition, it is found that only laminated roller being heated to uniform temperature is to be difficult to effectively backing material is laminated on the surface of poly tetrafluoroethylene, is not laminated firm inadequately, reducing service life greatly, is exactly that backing material is melted and causes waste product.
Summary of the invention
Technical problem to be solved by this invention is the manufacture method that a kind of polytetrafluoroethylene (PTFE) supported composite filtering film is provided at above-mentioned prior art present situation, by the manufacturing equipment of special use and special manufacture method, can effectively backing material be laminated on the surface of poly tetrafluoroethylene, not only laminated firm, improve the yield rate of product and the service life of product, and do not influenced the gas permeability of polytetrafluoroethylene (PTFE) miillpore filter; The present invention has overcome single polytetrafluoroethylene (PTFE) miillpore filter can not self-supporting, yielding, be unfavorable for the folding defective that is processed into pleat shaped filter element commonly used, and the aperture that has kept original film morphosis and film, the gas permeability influence is very few, and has improved the shrinkage and the mouldability of filter membrane material greatly.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of manufacture method of polytetrafluoroethylene (PTFE) supported composite filtering film, form by polytetrafluoroethylene (PTFE) miillpore filter and one deck backing material being superimposed together make, this manufacture method is as follows: 1. polytetrafluoroethylene (PTFE) miillpore filter and backing material are transported to by heating is compound by feeding rolling transmission device and roll roller and cooling combined rolling in the press fit device that roller constitutes, polytetrafluoroethylene (PTFE) miillpore filter and the compound roller that rolls of heating are pressed close to, backing material and the cooling combined roller that rolls are pressed close to; 2. by heater make the compound surface temperature of rolling roller of described heating be higher than described backing material melting temperature and smaller or equal to 300 ℃, make described cooling combined surface temperature of rolling roller be lower than the heat distortion temperature of described backing material by cooling device, and be higher than 0 ℃; 3. roll roller and described cooling combined rolling provides the pressing of 3～20MPa pressure between the roller in that described heating is compound, described polytetrafluoroethylene (PTFE) miillpore filter and described backing material machinery are pressed together; 4. the recombination line speed of controlling diaphragm is at 1 meter/minute～30 meters/minute; 5. by composite membrane rolling roller bearing the supported composite filtering film after compound being wound up into the composite membrane rolling rolls on the roller.
According to the difference of backing material, heat the compound roll surface temperature that rolls and to select different numerical value with the cooling combined roll surface temperature that rolls.
Described backing material is a polypropylene mesh, and the compound roll surface temperature that rolls of described heating is 180～300 ℃, and the cooling combined roll surface temperature that rolls is 20～85 ℃.
Described backing material is a polyester non-woven fabric, and the compound roll surface temperature that rolls of described heating is 270～300 ℃, and the cooling combined roll surface temperature that rolls is 15～60 ℃.
Described backing material is a nylon screen, and the compound roll surface temperature that rolls of described heating is 225～300 ℃, and the cooling combined roll surface temperature that rolls is 10～40 ℃.
Compared with prior art, the invention has the advantages that by being arranged on the compound heater that rolls in the roller of heating makes the compound surface temperature of rolling roller of the heating of pressing close to the polytetrafluoroethylene (PTFE) miillpore filter be higher than the melting temperature of backing material, and make the cooling combined surface temperature of rolling roller of pressing close to be lower than the heat distortion temperature of backing material with backing material by being arranged on the cooling combined cooling device that rolls the roller below, like this can with the surface portion fusing of the bonding backing material of polytetrafluoroethylene (PTFE) miillpore filter, can either guarantee that polytetrafluoroethylene (PTFE) miillpore filter and backing material are bonding effectively and compound for one, be unlikely again and backing material all melted or make the backing material thermal deformation; The present invention has overcome single polytetrafluoroethylene (PTFE) miillpore filter can not self-supporting, yielding, is unfavorable for the folding defective that is processed into pleat shaped filter element commonly used, and has improved the shrinkage and the mouldability of filter membrane material greatly; But composite membrane has the physicochemical characteristic of good anti-solvent high-temperature sterilization equally, and microporous teflon membran compound industrial production requirement continuously in enormous quantities can be regulated, can be satisfied to the compact conformation of set composite, complex parameter; The many uniform Halogen lamp LEDs of heating are evenly distributed on and roll roller inside, can guarantee rational heating rate and temperature homogeneity.According to production requirement, the drawing and setting that apparatus of the present invention both can be combined in the microporous teflon membran production process carries out the online compound of film and backing material afterwards with before the rolling, also can be independently compound to microporous teflon membran.
Adopt method and apparatus of the present invention, optimize complex condition and carry out serialization production, the polytetrafluoroethylene (PTFE) supported composite filtering film stable performance that obtains, do, the peel strength height of wet condition, compare with the polytetrafluoroethylene (PTFE) miillpore filter before compound, original morphosis and aperture that one side has kept film, gas permeability decline is few on the other hand, can remain on more than 85% of original film Air permenbility.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention ten;
Fig. 2 is the structural representation of the embodiment of the invention 11;
The structural representation that Fig. 3 cooperates with hydraulic transmission for press fit device of the present invention;
Fig. 4 is the structural representation of hydraulic transmission of the present invention;
Fig. 5 is the structural representation of press fit device of the present invention and temperature element and control device;
Fig. 6 is the structural representation of the cooling device of fan formation of the present invention.
The specific embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
Embodiment one: a kind of manufacture method of polytetrafluoroethylene (PTFE) supported composite filtering film, form by polytetrafluoroethylene (PTFE) miillpore filter and one deck polypropylene mesh being superimposed together make, this manufacture method is as follows: 1. will be arranged on the polytetrafluoroethylene (PTFE) miillpore filter on the polytetrafluoroethylene (PTFE) miillpore filter feeding roller bearing and be arranged on polypropylene mesh on the backing material feeding roller bearing and be transported to by the heating that is arranged above and below is compound by driving control system and roll roller and cooling combined rolling in the press fit device that roller constitutes, polytetrafluoroethylene (PTFE) miillpore filter and the compound roller that rolls of heating are pressed close to, polypropylene mesh and the cooling combined roller that rolls are pressed close to; 2. by to make the compound surface temperature of rolling roller of heating be 300 ℃ by evenly being arranged on the heater that constitutes of compound 18 Halogen lamp LEDs that roll in the roller of heating, cooling combinedly roll cooling device that roller below constitutes along cooling combined 5 fans that axially are set up in parallel that roll roller to make cooling combined surface temperature of rolling roller be 20 ℃ by being arranged on: 3. roll roller and cooling combined rolling provides the pressing of 3MPa pressure between the roller in the hydraulic pressure transfer mode in that heating is compound, polytetrafluoroethylene (PTFE) miillpore filter and polypropylene mesh machinery are pressed together by being arranged on the cooling combined hydraulic pressure transmission device that rolls on the roll shaft; 4. the recombination line speed of rotating speed controlling diaphragm by the control buncher is 5 meters/minute; 5. by composite membrane rolling roller bearing the supported composite filtering film after compound being wound up into the composite membrane rolling rolls on the roller.
Embodiment two: a kind of manufacture method of polytetrafluoroethylene (PTFE) supported composite filtering film, basic skills is identical with embodiment one, difference be step 2. in the heating compound surface temperature of rolling roller be 150 ℃, cooling combined surface temperature of rolling roller is 85 ℃, heating is compound in 3. rolls roller and the cooling combined pressing pressure that rolls between the roller is 20MPa for step, step 4. in recombination line speed be 15 meters/minute.
Embodiment three: a kind of manufacture method of polytetrafluoroethylene (PTFE) supported composite filtering film, basic skills is identical with embodiment one, difference be step 2. in the heating compound surface temperature of rolling roller be 230 ℃, cooling combined surface temperature of rolling roller is 40 ℃, heating is compound in 3. rolls roller and the cooling combined pressing pressure that rolls between the roller is 10MPa for step, step 4. in recombination line speed be 30 meters/minute.
Embodiment four: a kind of manufacture method of polytetrafluoroethylene (PTFE) supported composite filtering film, form by polytetrafluoroethylene (PTFE) miillpore filter and one deck polyester non-woven fabric being superimposed together make, this manufacture method is as follows: 1. will be arranged on the polytetrafluoroethylene (PTFE) miillpore filter on the polytetrafluoroethylene (PTFE) miillpore filter feeding roller bearing and be arranged on polyester non-woven fabric on the backing material feeding roller bearing and be transported to by the heating that is arranged above and below is compound by driving control system and roll roller and cooling combined rolling in the press fit device that roller constitutes, polytetrafluoroethylene (PTFE) miillpore filter and the compound roller that rolls of heating are pressed close to, polyester non-woven fabric and the cooling combined roller that rolls are pressed close to; 2. by to make the compound surface temperature of rolling roller of heating be 270 ℃ by evenly being arranged on the heater that constitutes of compound 16 Halogen lamp LEDs that roll in the roller of heating, cooling combinedly roll cooling device that the roller below constitutes along cooling combined 4 fans that axially are set up in parallel that roll roller to make cooling combined surface temperature of rolling roller be 15 ℃ by being arranged on; 3. roll roller and cooling combined roll roller between provide the pressing of 5MPa pressure in the hydraulic pressure transfer mode in that heating is compound by being arranged on the cooling combined hydraulic pressure transmission device that rolls on the roll shaft, polytetrafluoroethylene (PTFE) miillpore filter and polyester non-woven fabric machinery are pressed together; 4. the recombination line speed of rotating speed controlling diaphragm by the control buncher is 5 meters/minute; 5. by composite membrane rolling roller bearing the supported composite filtering film after compound being wound up into the composite membrane rolling rolls on the roller.
Embodiment five: a kind of manufacture method of polytetrafluoroethylene (PTFE) supported composite filtering film, basic skills is identical with embodiment four, difference be step 2. in the heating compound surface temperature of rolling roller be 290 ℃, cooling combined surface temperature of rolling roller is 60 ℃, heating is compound in 3. rolls roller and the cooling combined pressing pressure that rolls between the roller is 17MPa for step, step 4. in recombination line speed be 12 meters/minute.
Embodiment six: a kind of manufacture method of polytetrafluoroethylene (PTFE) supported composite filtering film, basic skills is identical with embodiment four, difference be step 2. in the heating compound surface temperature of rolling roller be 300 ℃, cooling combined surface temperature of rolling roller is 40 ℃, heating is compound in 3. rolls roller and the cooling combined pressing pressure that rolls between the roller is 9MPa for step, step 4. in recombination line speed be 28 meters/minute.
Embodiment seven: a kind of manufacture method of polytetrafluoroethylene (PTFE) supported composite filtering film, form by polytetrafluoroethylene (PTFE) miillpore filter and one deck nylon screen being superimposed together make, this manufacture method is as follows: 1. will be arranged on the polytetrafluoroethylene (PTFE) miillpore filter on the polytetrafluoroethylene (PTFE) miillpore filter feeding roller bearing and be arranged on nylon screen on the backing material feeding roller bearing and be transported to by the heating that is arranged above and below is compound by driving control system and roll roller and cooling combined rolling in the press fit device that roller constitutes, polytetrafluoroethylene (PTFE) miillpore filter and the compound roller that rolls of heating are pressed close to, nylon screen and the cooling combined roller that rolls are pressed close to; 2. by to make the compound surface temperature of rolling roller of heating be 300 ℃ by evenly being arranged on the heater that constitutes of compound 16 Halogen lamp LEDs that roll in the roller of heating, cooling combinedly roll cooling device that the roller below constitutes along cooling combined 4 fans that axially are set up in parallel that roll roller to make cooling combined surface temperature of rolling roller be 10 ℃ by being arranged on; 3. roll roller and cooling combined roll roller between provide the pressing of 5.0MPa pressure in the hydraulic pressure transfer mode in that heating is compound by being arranged on the cooling combined hydraulic pressure transmission device that rolls on the roll shaft, polytetrafluoroethylene (PTFE) miillpore filter and nylon screen machinery are pressed together; 4. the recombination line speed of rotating speed controlling diaphragm by the control buncher is 30 meters/minute; 5. by composite membrane rolling roller bearing the supported composite filtering film after compound being wound up into the composite membrane rolling rolls on the roller.
Embodiment eight: a kind of manufacture method of polytetrafluoroethylene (PTFE) supported composite filtering film, basic skills is identical with embodiment seven, difference be step 2. in the heating compound surface temperature of rolling roller be 250 ℃, cooling combined surface temperature of rolling roller is 30 ℃, heating is compound in 3. rolls roller and the cooling combined pressing pressure that rolls between the roller is 20MPa for step, step 4. in recombination line speed be 1 meter/minute.
Embodiment nine: a kind of manufacture method of polytetrafluoroethylene (PTFE) supported composite filtering film, basic skills is identical with embodiment seven, difference be step 2. in the heating compound surface temperature of rolling roller be 225 ℃, cooling combined surface temperature of rolling roller is 40 ℃, heating is compound in 3. rolls roller and the cooling combined pressing pressure that rolls between the roller is 10MPa for step, step 4. in recombination line speed be 10 meters/minute.
Embodiment ten: the manufacturing installation that uses when a kind of polytetrafluoroethylene (PTFE) supported composite filtering film is made, comprise feeding rolling transmission device 1, press fit device 2 and control device 3, control device 3 outputs a control signal to feeding rolling transmission device 1 and press fit device 2, feeding rolling transmission device 1 comprises polytetrafluoroethylene (PTFE) miillpore filter feeding roller bearing 11, backing material feeding roller bearing 12, composite membrane rolling roller bearing 13, roller 14 is rolled in polytetrafluoroethylene (PTFE) miillpore filter feeding transmission, roller 15 is rolled in backing material feeding transmission and roller 16 is rolled in composite membrane rolling transmission, press fit device 2 rolls roller 21 and rolls relative cooling combined of roller 21 and roll roller 22 and be arranged above and below and constitute with heating is compound by heating is compound, heat compound surface of rolling roller 21 and be coated with mirror face stainless steel, the cooling combined roller 22 that rolls is to coat rubber outer outside the stainless steel internal layer, heat and compoundly roll roller 21 and the cooling combined roller 22 that rolls drive to be rotated by the buncher (not shown), their rotating speed is controlled by the control signal that control device 3 outputs to buncher, the cooling combined axle that rolls roller 22 is provided with hydraulic pressure transmission device 23, as shown in the figure, hydraulic pressure transmission device 23 comprises two symmetrically arranged vertical direction motion slide blocks 231, Pressure gauge 232, hydraulic plumbing system 233 and hand supercharging handle 234, heat compound roller 21 inside of rolling and be provided with the heater 24 that constitutes by equally distributed 18 Halogen lamp LEDs, cooling combined below of rolling roller 22 has constituted cooling device 25 along cooling combined 5 fans that axially are set side by side with that roll roller 22, heat and compoundly roll roller 21 and the cooling combined roller 22 that rolls is provided with temperature element thermocouple 26 and measures the temperature of rolling the roller surface, temperature measurement signal is transported to control device 3, and feeding rolling transmission device 1 is provided with by the magnetic tension control mechanism, tension force that torque motor and automatic tension controller are formed and correction control device (not shown).
Embodiment 11: other structure is identical with embodiment ten, and to be press fit device 2 roll roller 21 and be arranged above and below and constitute with the compound cooling combined roller 22 that rolls of relative two of roller 21 that rolls of heating by two heating are compound difference.
In the foregoing description, heater 24 can be to be the electrothermal tube of medium with the Oil, Water, Gas, or adopt modes such as combustion gas heating, infrared heating, heating using microwave, high-frequency heating, radiation heating, Steam Heating, heater 24 can be arranged on compound roller 21 inside of rolling of heating, also can be arranged on heating and compoundly roll roller 21 outsides, or inside and outsidely be provided with simultaneously.
Claims (4)
1, a kind of manufacture method of polytetrafluoroethylene (PTFE) supported composite filtering film, form by polytetrafluoroethylene (PTFE) miillpore filter and one deck backing material being superimposed together make, it is characterized in that this manufacture method is as follows: 1. polytetrafluoroethylene (PTFE) miillpore filter and backing material are transported to by heating is compound by feeding rolling transmission device and roll roller and cooling combined rolling in the press fit device that roller constitutes, polytetrafluoroethylene (PTFE) miillpore filter and the compound roller that rolls of heating are pressed close to, backing material and the cooling combined roller that rolls are pressed close to; 2. by heater make the compound surface temperature of rolling roller of described heating be higher than described backing material melting temperature and smaller or equal to 300 ℃, make described cooling combined surface temperature of rolling roller be lower than the heat distortion temperature of described backing material by cooling device, and be higher than 0 ℃; 3. roll roller and described cooling combined rolling provides the pressing of 3～20MPa pressure between the roller in that described heating is compound, described polytetrafluoroethylene (PTFE) miillpore filter and described backing material machinery are pressed together; 4. the recombination line speed of controlling diaphragm is at 1 meter/minute～30 meters/minute; 5. by composite membrane rolling roller bearing the supported composite filtering film after compound being wound up into the composite membrane rolling rolls on the roller.
2, the manufacture method of polytetrafluoroethylene (PTFE) supported composite filtering film as claimed in claim 1, it is characterized in that described backing material is a polypropylene mesh, the compound roll surface temperature that rolls of described heating is 180～300 ℃, and the cooling combined roll surface temperature that rolls is 20～85 ℃.
3, the manufacture method of polytetrafluoroethylene (PTFE) supported composite filtering film as claimed in claim 1, it is characterized in that described backing material is a polyester non-woven fabric, the compound roll surface temperature that rolls of described heating is 270～300 ℃, and the cooling combined roll surface temperature that rolls is 15～60 ℃.
4, the manufacture method of polytetrafluoroethylene (PTFE) supported composite filtering film as claimed in claim 1, it is characterized in that described backing material is a nylon screen, the compound roll surface temperature that rolls of described heating is 225～300 ℃, and the cooling combined roll surface temperature that rolls is 10～40 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100231933A CN100358614C (en) | 2005-01-10 | 2005-01-10 | Manufacture process and apparatus for PTFE supported composite filtering film |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100231933A CN100358614C (en) | 2005-01-10 | 2005-01-10 | Manufacture process and apparatus for PTFE supported composite filtering film |
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| Publication Number | Publication Date |
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| CN1672779A CN1672779A (en) | 2005-09-28 |
| CN100358614C true CN100358614C (en) | 2008-01-02 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1326935C (en) * | 2005-12-05 | 2007-07-18 | 浙江理工大学 | Method for preparing PTFE film material for air degerming |
| CN100425332C (en) * | 2006-12-07 | 2008-10-15 | 浙江理工大学 | Preparation method of membrane-covered filter material for high-temperature flue gas/dust integrated treatment |
| CN101931085B (en) * | 2009-06-22 | 2012-12-19 | 宁波大学 | Preparation method for fuel cell compound proton exchange membrane enhanced by using SiO2 three-dimensional ultra-thin membrane |
| CN102441329A (en) * | 2010-10-09 | 2012-05-09 | 私立中原大学 | Moulding method and apparatus for asymmetric porous membrane material |
| CN103273717B (en) * | 2013-05-10 | 2016-01-06 | 安徽洁滤环保科技有限公司 | The method of hot pressing equipment complex and production coated filter material thereof |
| CN109603557B (en) * | 2018-12-25 | 2021-01-12 | 上海福赛特机器人有限公司 | Film folding device and method |
| CN112108007B (en) * | 2020-09-24 | 2022-07-26 | 中原工学院 | Polytetrafluoroethylene nanofiber filtering material and processing method thereof |
| CN113499644B (en) * | 2021-08-02 | 2022-11-18 | 江苏纤凯新材料有限公司 | Cold roll hot melting compound machine and tectorial membrane filter material production equipment thereof |
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| CN1123536A (en) * | 1993-03-25 | 1996-05-29 | 卡瑙德金属箱公开有限公司 | Process and apparatus for producing laminated materials |
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| CN1672779A (en) | 2005-09-28 |
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Assignee: Ningbo Changqi Fluoroplastic Product Co., Ltd. Assignor: Ningbo University Contract fulfillment period: 2008.9.10 to 2014.9.9 contract change Contract record no.: 2008330000646 Denomination of invention: Manufacture process and apparatus for PTFE supported composite filtering film Granted publication date: 20080102 License type: Exclusive license Record date: 2008.9.24 |
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Free format text: EXCLUSIVE LICENCE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.9.10 TO 2014.9.9 Name of requester: NINGBO CHANGQI FLUORIDE PLASTICS CO., LTD. Effective date: 20080924 |
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Assignee: Ningbo Changqi Fluoroplastic Product Co., Ltd. Assignor: Ningbo University Contract fulfillment period: 2008.9.10 to 2014.9.9 contract change Contract record no.: 2008990000576 Denomination of invention: Manufacture process and apparatus for PTFE supported composite filtering film Granted publication date: 20080102 License type: Exclusive license Record date: 2008.10.8 |
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| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.9.10 TO 2014.9.9; CHANGE OF CONTRACT Name of requester: NINGBO CHANGQI FLUORIDE PLASTICS CO., LTD. Effective date: 20081008 |
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Granted publication date: 20080102 Termination date: 20150110 |
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