CN103550986A - High-air permeability woven fabric laminated filtering material and preparation method thereof as well as laminating device - Google Patents
High-air permeability woven fabric laminated filtering material and preparation method thereof as well as laminating device Download PDFInfo
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Abstract
The invention discloses a high-air permeability woven fabric laminated filtering material and a preparation method thereof as well as a laminating device. The high-air permeability woven fabric laminated filtering material comprises a woven fabric base material and a PTFE (Polytetrafluoroethylene) microporous membrane, wherein salient points are arranged on the woven fabric base material, and the PTFE microporous membrane is compounded on the salient points; the plane tensile force of the woven fabric base material is greater than the plane tensile force of the PTFE microporous membrane. The preparation method of the high-air permeability woven fabric laminated material comprises the following steps: bulging the surface of the woven fabric base material, and compounding the bulged surface with the PTFE microporous membrane at intervals at high temperature through hot pressing, thus obtaining the high-air permeability woven fabric laminated filtering material. Due to the adoption of the preparation method, the problems that a conventional laminated filtering material is low in air permeability and short in service life and the membrane is seriously damaged are solved. The high-air permeability woven fabric laminated filtering material is high in air permeability, large in treatment air volume and long in service life and has relatively high fracture resistance property; the preparation method is simple and capable of substantially reducing the damage to the membrane; the laminating device is simple in structure, convenient to use and easy to control.
Description
Technical field
The present invention relates to a kind of high Air permenbility woven fabric coated filter material, its preparation method and film covering device used thereof.
Background technology
In atmosphere dedusting industry, coated filter material with the characteristic of its surface filtration have that filter efficiency is high, running resistance is low, deashing is easy and deashing number of times is few, process that air quantity is large, long service life and being used widely.And the coating technique of coated filter material has two kinds: the one, binder method, the 2nd, high temperature hot pressing method.The former is because the temperature tolerance of binding agent is poor and ageing of binders problem is eliminated gradually, and the latter is the technique being widely adopted.The hot pressing laminating machine nucleus equipment that high temperature hot pressing method is used is comprised of a high temperature hot-rolling and a high temperature resistant rubber roll or cold steel rod.Because woven fabric coated filter material base material is all plane, in the process of overlay film, hot pressing forms through high temperature hot-rolling for PTFE microporous barrier and woven fabric base material consistency from top to bottom.So just brought following problem: no matter be binding agent overlay film or high temperature hot pressing overlay film, PTFE microporous barrier is almost completely bonding with the plane of woven fabric base material, the whole face of PTFE microporous barrier is subject to the damage of high moderate pressure, causes the brute force of film, the reduction of Air permenbility; If base material is chemical fibre woven fabric, also likely because melting chemical fibre or rolling adhesive dot and stop up PTFE micropore, cause air penetrability to reduce; Equally, base material is also obtained very closely knit by hot pressing, thereby has affected processing air quantity and the service life of coated filter material.Especially environment temperature lower and folding overweight in, the phenomenon that coated filter material face or folding line there will be film to split, this has had a strong impact on the service life of filter efficiency and filter bag.
Summary of the invention
The object of this invention is to provide a kind of high Air permenbility woven fabric coated filter material, its preparation method and film covering device used thereof.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is as follows:
An Air permenbility woven fabric coated filter material, comprises woven fabric base material and PTFE microporous barrier, and woven fabric base material is provided with salient point, and PTFE microporous barrier is compounded on salient point; The plane strain of woven fabric base material is greater than the plane strain of PTFE microporous barrier.
Above-mentioned filtrate has increased substantially filter efficiency, has strengthened processing air quantity, has extended service life; Significantly reduced the damage of PTFE microporous barrier in preparation process simultaneously, good without disconnected fine phenomenon, pliability; The plane strain that the plane strain of woven fabric base material is greater than PTFE microporous barrier has effectively overcome cryogenic film and has split phenomenon.
PTFE micropore thickness is 5～15 μ m, and aperture is 0.2～1 μ m, the surface density 100～800g/m of woven fabric base material
2.Can further extend the service life of overlay film like this, guarantee filter efficiency simultaneously.
Above-mentioned PTFE microporous barrier through batch mixing, striking adobe, push, the operation manufacture such as calendering, longitudinal stretching, cross directional stretch, thermal finalization forms.
The plane strain of woven fabric base material is preferably 1～7kg, and the plane strain of PTFE microporous barrier is preferably 0～1kg.Can further overcome cryogenic film like this and split phenomenon, not affect outward appearance and the serviceability of filtrate simultaneously.
The preparation method of above-mentioned high Air permenbility woven fabric coated filter material, by woven fabric substrate surface blistering, and the face of blistering and PTFE microporous barrier gap high temperature hot pressing is compound, obtain.
Woven fabric base material can adopt the air such as twist yarn, zero twisted yarn, folded yarn, buiky yarn or interlacing yarn or mechanically deform yarn etc. to weave.
The preferred Adoption Network weaving yarns of woven fabric base material; While weaving, weft yarn number is through 2～8 times of yarn count or through yarn count, is 2～8 times of latitude number yarn; Preferably, weft yarn number is through 2～5 times of yarn count or through yarn count, is 2～5 times of latitude number yarn; More preferably, weft yarn number is through 2～4 times of yarn count or through yarn count, is 2～4 times of latitude number yarn.Adoption Network weaving yarns, one of object is to improve gas permeability and the folding resistance of coated filter material, extends life of bag filter; Warp thread adopts the number of different times to weave from weft yarn, is mainly in order to realize the object of blistering, thereby guarantees gas permeability and the treating capacity of filtrate, extends the service life of filtrate simultaneously.
Interlacing yarn is prepared interlacing yarn nozzle used and is comprised a deferent and air inlet pipe, and deferent is vertical with air inlet pipe is connected for silk; The upper arc tube that the lower semicircle pipe that described silk deferent is 3～8mm by internal diameter and internal diameter are 6～10mm is spliced; The central angle of upper arc tube is 90～150 °; The length of silk deferent is 30～80mm, and air inlet pipe internal diameter is 2～5mm; When prepared by interlacing yarn, air pressure is 4～10kg, and over feed rate(OFR) is 5～30%, and humidity is 40～90%.Adopt above-mentioned interlacing yarn nozzle and process conditions can further guarantee gas permeability and the folding resistance of coated filter material, further extend life of bag filter.Air inlet pipe is preferably connected with silk deferent central vertical.
The raw fibre of woven fabric base material is: the mixture of one or more any proportionings in glass fibre, basalt fibre, polypropylene fibre, polyethylene fibre, polyimide fiber, PET fiber, P84 fiber, PTFE fiber, Kafra fiber, aramid fiber or PA fiber; The filament diameter of described raw fibre is 1～20 μ m, is preferably 2～16 μ m, more preferably 3～11 μ m; Can further guarantee gas permeability, folding resistance and the service life of coated filter material like this.
Woven fabric base material needs through chemical surface treatment before overlay film, gives waterproof that base material is good, heatproof, folding, acid-alkali-corrosive-resisting, antistatic and good overlay film performance.In chemical treating process, need to keep salient point upwards, not destroy the shape of salient point as far as possible, want adjusting furnace temperature to make the temperature difference of upper surface and lower surface within the scope of 10～100 ℃ simultaneously, allow chemical pretreatment solution to the top migration of salient point, the basis of establishing for overlay film.
Above-mentioned chemical surface treatment chemical pretreatment solution used is preferably comprised of following component: the water of gamma-aminopropyl-triethoxy-silane 0.2-1%, ptfe emulsion 12-18%, polyacrylate dispersion 10-14%, silicone oil-2856-10%, fluorine-containing water repellent WG-88001-3% and surplus, described percentage is mass percent.Adopt above-mentioned treatment fluid can guarantee the required physical property of base material, chemical property and overlay film performance.
Above-mentioned gap high temperature hot pressing complex method is: adopt upper and lower two high temperature hot-rollings to pressing, the temperature of hot-rolling is 260～450 ℃, speed is 0.5～25 m/min, the gap of two high temperature hot-rollings lower than blistering after the gross thickness of woven fabric base material, higher than the thickness of woven fabric base material before blistering; The cornerite of woven fabric base material on hot-rolling is 150～180 °.One of selection object of above-mentioned cornerite scope is that pre-hot substrate improves overlay film efficiency and compound film quality.
A film covering device of preparing above-mentioned high Air permenbility woven fabric coated filter material, comprises woven fabric base material feeding mechanism, PTFE microporous barrier feeding mechanism, the permanent tension force laminating machine of two hot-rolling, coated filter material tension controller and the permanent tension rolling machine of coated filter material; Woven fabric base material feeding mechanism and PTFE microporous barrier feeding mechanism join with the permanent tension force laminating machine of two hot-rollings respectively, and the permanent tension force laminating machine of two hot-rollings sequentially joins with coated filter material tension controller and the permanent tension rolling machine of coated filter material again successively.
Woven fabric base material feeding mechanism comprises that the permanent tension force unreeling machine of woven fabric base material, woven fabric base material that order is joined connect cloth machine, the permanent tension storing machine of woven fabric base material, woven fabric base material constant tension controller and woven fabric base material flatten mechanism, and woven fabric base material flatten mechanism joins with the permanent tension force laminating machine of two hot-rollings; PTFE microporous barrier feeding mechanism comprises the permanent tension force unreeling machine of PTFE microporous barrier, PTFE microporous barrier constant tension controller and the PTFE microporous barrier flatten mechanism that order is joined, and PTFE microporous barrier flatten mechanism joins with the permanent tension force laminating machine of two hot-rollings.
Adopt the preparation method of said apparatus: will initiatively unreel through the good woven fabric base material of stentering forming chemical treatment, 180 ° of coated hot-rollings are with preheating, and salient point is positioned at the outside of base material; The PTFE microporous barrier that biaxial tension is good initiatively unreels, with woven fabric base material consistency from top to bottom; The plane strain of PTFE film is the smaller the better in the situation that keeping flattening, and is generally less than 1kg.The plane strain of base material is far longer than the plane strain of PTFE microporous barrier, and object is that after peritonaeum, the film between salient point is slightly loose, and the film that can resist Yin Wendu, fold etc. causes splits; The size to the ，Gai gap, gap of pressure hot-rolling that enters the permanent tension force laminating machine of two hot-rollings after base material and PTFE microporous barrier consistency from top to bottom mixes up locking according to the height of base material salient point in advance; Base material is when fast by high temperature pair roller, high temperature heats rapidly film and the base material at salient point place, make film and salient point because the effect of temperature, pressure is firmly bonded as one, do not have the place of salient point to keep non-caked state, and be not subject to the damage of high temperature, pressure; Due to the optimum organization of temperature, gap, speed, guaranteeing in film and the sufficiently high situation of salient point bonding intensity, the damaged degree of film is minimum, and keeps bonding point still to have micropore to exist.The temperature of hot-rolling is 260～450 ℃, and speed is 0.5～25 m/min.By this film and the compound good high Air permenbility woven fabric coated filter material rolling of base material, check, cut, make and become filter bag for client.This coated filter material is surface filtration, and processing air quantity is large, windage is little, deashing number of times is few, pressure oscillation is little, filter efficiency is high, long service life, has good cost performance and economic benefit, social benefit.
The NM technology of the present invention is prior art.
Of the present inventionly effectively solved the problem that existing coated filter material air penetrability is low, membrane damage is serious, service life is short; The high Air permenbility woven fabric of the present invention coated filter material air penetrability is high, processing air quantity is large, long service life, has higher fracture resistance; Preparation method of the present invention is simple and significantly reduced the damage to film; Film covering device of the present invention is simple in structure, easy to use, easily control.
Accompanying drawing explanation
Fig. 1 is coating technique schematic diagram;
Fig. 2 is that interlacing yarn nozzle and interlacing yarn are manufactured schematic diagram;
Fig. 3 is that the A-A of Fig. 2 is to view;
Fig. 4 is four pieces of satin fabric structure figure of woven fabric;
Fig. 5 is film covering device structural representation.
In figure, 1 is woven fabric base material, 2 is salient point, 3 is PTFE microporous barrier, 4 is lower high temperature hot-rolling, 5 is upper high temperature hot-rolling, 6 is high Air permenbility woven fabric coated filter material, 7 is upper arc tube, 8 is lower semicircle pipe, 9 is air inlet pipe, 10 is raw tow, 11 is interlacing yarn, 12 is the permanent tension rolling machine of coated filter material, 13 is the permanent tension force unreeling machine of woven fabric base material, 14 is coated filter material tension controller, 15 connect cloth machine for woven fabric base material, 16 is high Air permenbility woven fabric coated filter material, 17 is the permanent tension storing machine of woven fabric base material, 18 is woven fabric base material constant tension controller, 19 is woven fabric base material flatten mechanism, 20 is the permanent tension force laminating machines of two hot-rollings, 21 is PTFE microporous barrier flatten mechanism, 22 is PTFE microporous barrier constant tension controller, 23 is PTFE microporous barrier, 24 is the permanent tension force unreeling machine of PTFE microporous barrier, 25 is silk deferent.
The specific embodiment
In order to understand better the present invention, below in conjunction with embodiment, further illustrate content of the present invention, but content of the present invention is not only confined to the following examples.
Embodiment 1
Woven fabric base material is glass fiber weaving cloth, and through the whole Adoption Network yarns of weft yarn, weft yarn number is 2 times through yarn count, therefore presents bump structure, the gross thickness 0.6 ± 0.05mm of woven fabric base material, surface density 550g/m
2, fabric structure: four pieces of satin (Crowfoot satin), substrate plane tension force 2.6kg;
Interlacing yarn interlacing yarn nozzle used and technological parameter are as shown in Figure 2,3: interlacing yarn nozzle lower semicircle pipe internal diameter is 6mm, and upper arc tube internal diameter is 10mm, and upper arc tube central angle is 120 °, silk road pipe range 45mm, air inlet pipe internal diameter is 3.5, air pressure 6kg, over feed rate(OFR) 20%, humidity 60%.
Woven fabric base material chemical surface treatment before overlay film chemical pretreatment solution used comprises: gamma-aminopropyl-triethoxy-silane (Nanjing Lian Gui Chemical Co., Ltd.) 0.5%, ptfe emulsion (concentrated dispersion liquid for weaving, solid content 60%; Zhong Hao Chenguang Research Institute of Chemical Industry Co., Ltd) 15%, polyacrylate dispersion (dermatine emulsion, solid content 50%; Beijing Dongfang Yakeli Chemical Science Co., Ltd) 12% fluorine-containing water repellent WG-8800(Jiangsu Jia Yefu material Science and Technology Ltd. silicone oil-285(Jinan Xin Qiye Chemical Co., Ltd.) 8%) 2%, all the other are water, and it is stand-by that uniform stirring is mixed into suspension.In chemical treating process, need to keep salient point upwards, do not destroy the shape of salient point as far as possible, bake out temperature: 230 ℃ of cloth bottom surfaces, 250 ℃ of cloth upper surfaces, allowing chemical pretreatment solution move to the top of salient point, is the basis that overlay film is established, 280 ℃ of film forming (emulsion forms in conjunction with firmly soft film on the surface of base material) temperature;
Woven fabric base material, when overlay film, adopts stentering forming impregnation process technique, and permanent tension force is controlled completely.Film covering device, comprises woven fabric base material feeding mechanism, PTFE microporous barrier feeding mechanism, the permanent tension force laminating machine of two hot-rolling, coated filter material tension controller and the permanent tension rolling machine of coated filter material; Woven fabric base material feeding mechanism and PTFE microporous barrier feeding mechanism join with the permanent tension force laminating machine of two hot-rollings respectively, and the permanent tension force laminating machine of two hot-rollings sequentially joins with coated filter material tension controller and the permanent tension rolling machine of coated filter material again successively.
Woven fabric base material feeding mechanism comprises that the permanent tension force unreeling machine of woven fabric base material, woven fabric base material that order is joined connect cloth machine, the permanent tension storing machine of woven fabric base material, woven fabric base material constant tension controller and woven fabric base material flatten mechanism, and woven fabric base material flatten mechanism joins with the permanent tension force laminating machine of two hot-rollings; PTFE microporous barrier feeding mechanism comprises the permanent tension force unreeling machine of PTFE microporous barrier, PTFE microporous barrier constant tension controller and the PTFE microporous barrier flatten mechanism that order is joined, and PTFE microporous barrier flatten mechanism joins with the permanent tension force laminating machine of two hot-rollings.
Utilize said apparatus by blistering compound through woven fabric base material and the PTFE microporous barrier gap high temperature hot pressing of chemical pretreatment solution processing; Adopt stentering forming impregnation process technique, permanent tension force is controlled completely.The gap of two hot-pressing rollers is 0.5mm, 360 ℃ of upper roll temperatures, and 220 ℃ of lower roll temperatures, pressure 0.4MPa, 5 ms/min of linear velocities, obtain high Air permenbility woven fabric coated filter material.
Comparative example 1
Substantially the same manner as Example 1, difference is: woven fabric base material is glass fiber weaving cloth, weft yarn varicosity, thickness 0.6 ± 0.05mm, surface density 550g/m
2fabric structure: four pieces of satin (Crowfoot satin), do not have bump structure, substrate plane tension force 2.6kg.
Embodiment 2
Glass fiber weaving cloth, through the whole Adoption Network yarns of weft yarn, weft yarn number is 2 times through yarn count, therefore presents bump structure, the gross thickness 0.8 ± 0.05mm of woven fabric, surface density 750g/m
2fabric structure: four pieces of satin, substrate plane tension force 3kg;
Interlacing yarn of the present invention nozzle used and technological parameter are: interlacing yarn nozzle lower semicircle pipe internal diameter is 6mm, and upper arc tube internal diameter is 10mm, and the central angle of upper arc tube is 120 °, silk road pipe range 45mm, air inlet pipe internal diameter is 3.5mm, air pressure 6kg, over feed rate(OFR) 20%, humidity 60%.
Woven fabric base material chemical surface treatment before overlay film chemical pretreatment solution used comprises: gamma-aminopropyl-triethoxy-silane (Nanjing Lian Gui Chemical Co., Ltd.) 0.5%, ptfe emulsion (Zhong Hao Chenguang Research Institute of Chemical Industry Co., Ltd) 15%, polyacrylate dispersion (Beijing Dongfang Yakeli Chemical Science Co., Ltd) 12%, silicone oil-285(Jinan Xin Qiye Chemical Co., Ltd.) 8%, fluorine-containing water repellent WG-8800(Jiangsu Jia Yefu material Science and Technology Ltd.) 2%, all the other are water, and it is stand-by that uniform stirring is mixed into suspension.In chemical treating process, need to keep salient point upwards, do not destroy the shape of salient point as far as possible, bake out temperature: 240 ℃ of cloth bottom surfaces, 260 ℃ of cloth upper surfaces, allowing chemical pretreatment solution move to the top of salient point, is the basis that overlay film is established, 280 ℃ of film forming (emulsion forms in conjunction with firmly soft film on the surface of base material) temperature.
Comparative example 2
Substantially the same manner as Example 1, difference is: woven fabric base material is glass fiber weaving cloth, weft yarn varicosity, thickness 0.8 ± 0.05mm, surface density 750g/m
2fabric structure: four pieces of satin (Crowfoot satin), do not have bump structure, substrate plane tension force 3.5kg.
The technique not illustrating in the various embodiments described above all can be with reference to existing technique.
Under 127Pa pressure, detect base material and retroperitoneal ventilative situation, adopt three pin industrial sewing machines, the compound stitching sewing machine of tetrafluoro/glass, and in low temperature (5 ℃ of <) situation, observe folding and unfolded film and split situation, the results are shown in Table 1:
Table 1
| Sequence number | Glass base material (cm/s) | Coated filter material (cm/s) | Sewing caudacoria splits phenomenon | Folding caudacoria splits phenomenon |
| Comparative example 1 | 20 | 1.5 | Seriously | Seriously |
| Embodiment 1 | 20 | 4 | Nothing | Nothing |
| Comparative example 2 | 15 | 1.2 | Seriously | Seriously |
| Embodiment 2 | 15 | 3 | Nothing | Nothing |
Because the coated filter material of technique of the present invention and device fabrication is greatly improved aspect splitting in ventilative, cryogenic film, process that air quantity is large, long service life, saved dedusting operating cost.
Claims (10)
1. a high Air permenbility woven fabric coated filter material, is characterized in that: comprise woven fabric base material and PTFE microporous barrier, woven fabric base material is provided with salient point, and PTFE microporous barrier is compounded on salient point; The plane strain of woven fabric base material is greater than the plane strain of PTFE microporous barrier.
2. high Air permenbility woven fabric coated filter material as claimed in claim 1, is characterized in that: PTFE micropore thickness is 5～15 μ m, and aperture is 0.2～1 μ m, the surface density 100～800g/m of woven fabric base material
2.
3. high Air permenbility woven fabric coated filter material as claimed in claim 1 or 2, is characterized in that: the plane strain of woven fabric base material is 1～7kg, and the plane strain of PTFE microporous barrier is 0～1kg.
4. a preparation method for the high Air permenbility woven fabric coated filter material described in claim 1-3 any one, is characterized in that: by woven fabric substrate surface blistering, and the face of blistering and PTFE microporous barrier gap high temperature hot pressing is compound, obtain.
5. method as claimed in claim 4, is characterized in that: woven fabric base material Adoption Network weaving yarns; While weaving, weft yarn number is through 2～8 times of yarn count or through yarn count, is 2～8 times of latitude number yarn.
6. method as claimed in claim 5, is characterized in that: interlacing yarn is prepared interlacing yarn nozzle used and comprised a deferent and air inlet pipe, and deferent is vertical with air inlet pipe is connected for silk; The upper arc tube that the lower semicircle pipe that described silk deferent is 3～8mm by internal diameter and internal diameter are 6～10mm is spliced; The central angle of upper arc tube is 90～150 °, and the length of silk deferent is 30～80mm, and air inlet pipe internal diameter is 2～5mm; When prepared by interlacing yarn, air pressure is 4～10kg, and over feed rate(OFR) is 5～30%, and humidity is 40～90%.
7. the method as described in claim 4-6 any one, is characterized in that: the raw fibre of woven fabric base material is: the mixture of one or more any proportionings in glass fibre, basalt fibre, polypropylene fibre, polyethylene fibre, polyimide fiber, PET fiber, P84 fiber, PTFE fiber, Kafra fiber, aramid fiber or PA fiber; The filament diameter of described raw fibre is 1～20 μ m; After woven fabric substrate surface blistering, with chemical pretreatment solution, carry out surface treatment, chemical pretreatment solution is comprised of following component: the water of gamma-aminopropyl-triethoxy-silane 0.2-1%, ptfe emulsion 12-18%, polyacrylate dispersion 10-14%, silicone oil-2856-10%, fluorine-containing water repellent WG-88001-3% and surplus, described percentage is mass percent.
8. the method as described in claim 4-6 any one, it is characterized in that: gap high temperature hot pressing complex method is: adopt upper and lower two high temperature hot-rollings to pressing, the temperature of hot-rolling is 260～450 ℃, speed is 0.5～25 m/min, the gap of two high temperature hot-rollings lower than blistering after the gross thickness of woven fabric base material, higher than the thickness of woven fabric base material before blistering; The cornerite of woven fabric base material on hot-rolling is 150～180 °.
9. a film covering device of preparing high Air permenbility woven fabric coated filter material described in claim 1-4 any one, is characterized in that: comprise woven fabric base material feeding mechanism, PTFE microporous barrier feeding mechanism, the permanent tension force laminating machine of two hot-rolling, coated filter material tension controller and the permanent tension rolling machine of coated filter material; Woven fabric base material feeding mechanism and PTFE microporous barrier feeding mechanism join with the permanent tension force laminating machine of two hot-rollings respectively, and the permanent tension force laminating machine of two hot-rollings sequentially joins with coated filter material tension controller and the permanent tension rolling machine of coated filter material again successively.
10. film covering device as claimed in claim 9, it is characterized in that: woven fabric base material feeding mechanism comprises that the permanent tension force unreeling machine of woven fabric base material, woven fabric base material that order is joined connect cloth machine, the permanent tension storing machine of woven fabric base material, woven fabric base material constant tension controller and woven fabric base material flatten mechanism, and woven fabric base material flatten mechanism joins with the permanent tension force laminating machine of two hot-rollings; PTFE microporous barrier feeding mechanism comprises the permanent tension force unreeling machine of PTFE microporous barrier, PTFE microporous barrier constant tension controller and the PTFE microporous barrier flatten mechanism that order is joined, and PTFE microporous barrier flatten mechanism joins with the permanent tension force laminating machine of two hot-rollings.
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Effective date of registration: 20200220 Address after: 210000 No.30, Andri, Yuhua West Road, Nanjing, Jiangsu Province Patentee after: Nanjing Glass Fibre Research and Design Institute company limited Address before: Jiangning District of Nanjing City, Jiangsu province 211100 Jiangning Science Park Tong Road No. 99 Patentee before: Sinoma Science & Technology Co.,Ltd. |
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