CN103448189A - High-precision calender for polyetrafluoroethylene microporous membrane - Google Patents
High-precision calender for polyetrafluoroethylene microporous membrane Download PDFInfo
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- CN103448189A CN103448189A CN2013104427478A CN201310442747A CN103448189A CN 103448189 A CN103448189 A CN 103448189A CN 2013104427478 A CN2013104427478 A CN 2013104427478A CN 201310442747 A CN201310442747 A CN 201310442747A CN 103448189 A CN103448189 A CN 103448189A
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Abstract
The invention discloses a high-precision calender for a polyetrafluoroethylene microporous membrane. The high-precision calender comprises a machine frame, a transmission mechanism, an upper calendering roller and a lower calendering roller and further comprises telescopic mechanisms, first bearings, first bearing seats, second bearings and second bearing seats, wherein the transmission mechanism can drive the upper calendering roller and the lower calendering roller to move in opposite directions, the upper calendering roller and the lower calendering roller are arranged on the machine frame, the telescopic mechanisms are arranged at the two ends of the upper calendering roller respectively, the first bearings are arranged at the two ends of the upper calendering roller respectively, the first bearing seats correspond to the first bearings respectively, the second bearings are arranged at the two ends of the lower calendering roller respectively, the second bearing seats correspond to the second bearings respectively, one end of each telescopic mechanism is fixedly connected to the machine frame, the other end of each extensible mechanism is fixedly connected with one of the first bearing seats, and the second bearing seats are fixedly connected to the machine frame. The high-precision calender for the polyetrafluoroethylene microporous membrane can meet the requirement for the micron-level thickness in the manufacturing process, the thickness of the polyetrafluoroethylene microporous membrane can be adjusted, the accuracy for contcalendering the thickness is high, material bars do not move leftward or rightward in the manufacturing process, the obtained calendered piece is even in thickness, and the width of the calendered piece can be controlled.
Description
Technical field
The present invention relates to a kind of polytetrafluoroethylmicroporous microporous membrane high accuracy calender.
Background technology
At present both at home and abroad the basic stretch processes method that adopts is manufactured microporous teflon membran, and technological process is: batch mixing-pressed compact-extruding-calendering-indulge drawing-horizontal is drawn etc.In recent years, polytetrafluoroethylmicroporous microporous membrane (hereinafter to be referred as the ePTFE film) is because of its increasing field of outstanding Chemical Physics performance quilt Application and Development, as middle normal temperature Environmental-protecting dust-removing filtrate, " Waterproof Breathable " function clothes fabric, bio-medical material etc.These application are to have good multi-cellular structure to common requirements of ePTFE film, and the thickness of finished film is thinned to micron order simultaneously, the thickness requirement of calendered sheeting also is as thin as below 100 microns, and thickness deviation are also micron orders.
The effect of calender is to prolong transfer roller cylinder (hereinafter to be referred as roller) with a pair of spinning in opposite directions the PTFE material strip of preceding working procedure input push and broadening, becomes even thickness and the thin slice of one fixed width is arranged, and offers lower road biaxial tension operation and continues to process.Calendered sheeting thickness is more thin more even, and the performance of final microporous membrane goods is improved and stable more favourable; Simultaneously, for improving yield rate, the width of finished film is also had to different requirements, therefore the width of calendered sheeting is also just had to different requirements.So it is the core technology of ePTFE film with the high accuracy calender that THICKNESS CONTROL and width are controlled.
There is following defect in plastic calender of the prior art:
One, roller the problems in the design, can not meet micron-sized thickness deviation requirement, and repair rate is high.1, the roller material adopts chilled cast iron or alloy chilled cast iron, and under operating temperature, inhomogeneous thermal deformation reduces surperficial mechanical precision; 2, the draw ratio of roller (active length L and roller diameter D ratio) is greater than 1, and during work, roller is easily crooked, also have roller be designed to drum type for counter-bending, in high type, middle height, at 0.02～0.1mm, obviously can't be produced ultrathin calendared sheet; 3, roller surface adopts the minute surface roughness substantially, but smooth roller and containing easily skidding between the oily PTFE material strip of formula, the thin slice broadening that can not form calendered sheeting or formation is inadequate, commonly use in the industry sand paper manual grinding roller surface, improve roughness and overcome skidding, the sand trace of manual grinding is inhomogeneous, and the tractive force of formation is also inhomogeneous, rolls the sheet thickness inevitable inhomogeneous; Cast iron gets rusty easily in addition, adds repeatedly polishing, and roller surface precision very fast (1～2 year) can not meet production requirement and needs depot repair with regard to being reduced to, and delaying production also increases the maintenance of equipment expense.
Two, rolled products is thinner, the horizontal pressure (being radial separation power) of calendering material pair roller barrel is higher, the top roller deadweight of existing calender pressurization, and without constant voltage pressurize measure, horizontal pressure just can not effectively, stably be overcome balance greatly to a certain extent, the roller spacing can't further be dwindled, and can't extrude the ultra-thin calendared sheet below 100 microns at all.
Three, the roller gap degree of regulation is low, and can not be held: be 1, the manual adjustments gap mostly, only have the patent that the patent No. is 201220063569.9 to mention pneumatic dancer rools spacing, although it is mobile that this mechanism can make roller slide more effortlessly, can't realize micron-sized accurate control; 2, there is no the minimum spacing stopping means, the spacing manually mixed up can be because the left and right of material strip jumps and changes, neglect the left thin right side thick, neglect thin in the right and thick in the left.
Four, roller spring bearing sliding bearing commonly used, under need adding high pressure duty, roller can't meet instructions for use, even after using rolling bearing instead, though can meet the high capacity requirement, the play that rolling bearing itself exists also can't guarantee the thickness and precision requirement of calendered sheeting.
Five, the fabric width of calendered sheeting can't accurately be controlled.Exist skidding and above-mentioned three to have the about material strip factors such as phenomenon that jump due to above-mentioned one, during the calendered sheeting fabric width and when wide and narrow, also can be " S " type.
Summary of the invention
The purpose of this invention is to provide a kind of polytetrafluoroethylmicroporous microporous membrane high accuracy calender.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is as follows:
A kind of polytetrafluoroethylmicroporous microporous membrane high accuracy calender, comprise frame, transmission mechanism, upper stretcher roll and bottom calender roll cylinder, transmission mechanism can drive stretcher roll and bottom calender roll cylinder move toward one another, upper stretcher roll and bottom calender roll cylinder are located on frame, also comprise: be located at the telescopic mechanism at stretcher roll two ends, the clutch shaft bearing that is located at the stretcher roll two ends and corresponding clutch shaft bearing seat and be located at the second bearing and corresponding second bearing block at bottom calender roll cylinder two ends; Telescopic mechanism one end is connected on frame, and the other end and clutch shaft bearing seat are connected, and the second bearing block is connected on frame.
The frame of above-mentioned calender is provided with rectilinear orbit, and upper stretcher roll can move up and down along the rectilinear orbit on frame, specifically can the adjusting by telescopic mechanism of its relative bottom calender roll cylinder, thus realized the adjustable function of polytetrafluoroethylmicroporous microporous membrane thickness.
Above-mentioned polytetrafluoroethylmicroporous microporous membrane high accuracy calender, also comprise the elastomeric element that is located at the stretcher roll two ends and be located at the 3rd bearing and corresponding the 3rd bearing block at stretcher roll axle two ends; Described elastomeric element one end is connected on frame by the first bearing pin, and the other end is connected on the second bearing block by the second bearing pin.But, like this by the prefastening force balance roller deadweight of adjustable elastic parts, make the bearing clearance of axle lower half remain zero, thereby guarantee the clearance control precision.Above-mentioned elastomeric element is preferably cylinder or spring mechanism.
Above-mentioned polytetrafluoroethylmicroporous microporous membrane high accuracy calender, also comprise servo electrical machinery system, precision speed reduction device, precision lead screw, nut, ramp piece and lower inclined plane piece that PLC controls; Described ramp piece and the lower inclined plane piece structure that is connected as a single entity, the upper horizontal plane of ramp piece is connected on the clutch shaft bearing seat; Described lower inclined plane piece forms transmission by nut and precision lead screw engagement; Described precision lead screw is connected with the servo electrical machinery system that PLC controls with precision speed reduction device successively.Above-mentioned transmission is feed screw nut pair, by above-mentioned improvement, both can the open loop of screen input parameter controls, and also can closed loop automatically control, and can finely tune separately by an end, also can the two ends synchronous micro-adjusting, and can make roller minimum clearance remain on setup parameter.
Above-mentioned telescopic mechanism is hydraulic cylinder, and described hydraulic cylinder is connected on frame, and its piston rod is connected with the clutch shaft bearing seat.
Above-mentioned polytetrafluoroethylmicroporous microporous membrane high accuracy calender, also comprise fuel tank, exert pressure pressure-retaining system and related valve loop, and hydraulic cylinder is connected with related valve loop, the pressure-retaining system of exerting pressure, fuel tank successively.Aforementioned related valve loop comprises solenoid directional control valve, overflow valve, solenoid check valve and connecting line, and effect is the normal smooth working of assurance system.
The described pressure-retaining system of exerting pressure is small-sized hydraulic station or gas-liquid booster pump.Can after required pressure is set up, can automatically keep this pressure by above-mentioned improvement, no longer because of the large separate roller spacing of horizontal pressure, thereby keep the roller spacing parameter constant, thereby guarantee the constant thickness of calendared sheet.In the present invention, calendared sheet refers to be rolled the rear gained of material calendering.
Above-mentioned polytetrafluoroethylmicroporous microporous membrane high accuracy calender, also comprise the guiding Fixed width mould be connected on frame; Described guiding Fixed width mould comprises arrival end and the port of export, by extrudate, through arrival end, to the port of export, is admitted to upper stretcher roll and bottom calender roll cylinder porch; Arrival end is provided with guide channel between the port of export, and the shape of cross section of guide channel progressively is transited into from the circle of arrival end the rectangle that the port of export is flat, the width of guide channel from the arrival end to the port of export from 10～35mm broadening to 120～400mm gradually.Can effectively control the width of calendared sheet by above-mentioned improvement.
In the application, upper stretcher roll and bottom calender roll cylinder porch refer to: by extrudate, be about to enter the position between upper stretcher roll and bottom calender roll cylinder; Upper stretcher roll and bottom calender roll cylinder exit refer to: by extrudate, just left the position between upper stretcher roll and bottom calender roll cylinder after rolling.
Above-mentioned polytetrafluoroethylmicroporous microporous membrane high accuracy calender, also comprise guide roller, and described guide roller is located at the below in the exit of stretcher roll and bottom calender roll cylinder.By above-mentioned improvement by the calendared sheet after rolling from stretcher roll and bottom calender roll cylinder exit out after, to first pass through guide roller and then outflow, force like this calendared sheet that a larger wrap angle sigma is arranged on the bottom calender roll cylinder, the larger frictional traction of α value is larger, and the calendering fabric width is just wider.
Described transmission mechanism comprises speed synchronous control system, motor, reductor and the shaft coupling that two covers connect successively, and two sets of transmission mechanism are connected with bottom calender roll cylinder axle with upper stretcher roll axle by shaft coupling respectively.
The material of upper stretcher roll and bottom calender roll cylinder is the heat-resisting alloy forged steel; The draw ratio of upper stretcher roll and bottom calender roll cylinder all is less than 1; The surface of upper stretcher roll and bottom calender roll cylinder is all plated and is coated with the cloudy surface hard chrome, and the surface roughness of upper stretcher roll and bottom calender roll cylinder is 0.08～3.2 μ m.Described cloudy surface hard chrome, be by upper stretcher roll and bottom calender roll cylinder fine finishining post processing, hard chrome plating after can surface sand-blasting processing, also can the surface laser etching after hard chrome plating.The mantle friction of above-mentioned upper stretcher roll and bottom calender roll cylinder is even, and does not have at work the phenomenon of skidding, and rolls the calendared sheet even thickness that, and long service life, maintenance cost are low.
The NM technology of the present invention is prior art.
Polytetrafluoroethylmicroporous microporous membrane of the present invention can meet the manufacture craft of micron order thickness with the high accuracy calender, and thickness is adjustable, and the degree of accuracy of THICKNESS CONTROL is high, in preparation process, does not exist the material strip left and right to jump, the even thickness of gained calendared sheet; And width is controlled.
The accompanying drawing explanation
Fig. 1 is high accuracy calender structural representation for polytetrafluoroethylmicroporous microporous membrane.
The A-A that Fig. 2 is Fig. 1 is to enlarged diagram.
Fig. 3 is guiding Fixed width mould structure schematic diagram.
In figure, 1 is upper stretcher roll, 2 is frame, 3 is the first bearing pin, 4 is piston rod, 5 is spring mechanism, 6 is the clutch shaft bearing seat, 7 is rectilinear orbit, 8 is clutch shaft bearing, 9 is the second bearing pin, 10 is the 3rd bearing and corresponding the 3rd bearing block, 11 is upper stretcher roll axle, 12 is by the calendering material, 13 is guiding Fixed width mould, 14 is the ramp piece, 15 is the lower inclined plane piece, 17 is nut, 18 is the second bearing, 19 is the second bearing block, 20 is the second bearing block, 21 is the bottom calender roll cylinder, 22 is calendared sheet, 23 is guide roller, 24 is precision speed reduction device, 25 servo electrical machinery systems, 26 is hydraulic cylinder, 27 is fuel tank, 28 is gas-liquid booster pump, 29 is the related valve loop, 30 is shaft coupling, 31 is reductor, 32 is motor, 33 is speed synchronous control system, 34 is guide channel, 35 is the limit for width rib, 36 is installing hole.
The specific embodiment
In order to understand better the present invention, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to the following examples.
The high accuracy calender of polytetrafluoroethylmicroporous microporous membrane as shown in Figure 1, 2, comprise frame, transmission mechanism, upper stretcher roll and bottom calender roll cylinder, transmission mechanism can drive stretcher roll and bottom calender roll cylinder move toward one another, upper stretcher roll and bottom calender roll cylinder are located on frame, also comprise: be located at the hydraulic cylinder at stretcher roll two ends, the clutch shaft bearing that is located at the stretcher roll two ends and corresponding clutch shaft bearing seat and be located at the second bearing and corresponding second bearing block at bottom calender roll cylinder two ends; Hydraulic cylinder is connected on frame, and its piston rod is connected with the clutch shaft bearing seat, and the second bearing block is connected on frame.
Polytetrafluoroethylmicroporous microporous membrane high accuracy calender, also comprise the spring mechanism that is located at the stretcher roll two ends and be located at the 3rd bearing and corresponding the 3rd bearing block at stretcher roll axle two ends; Described spring mechanism one end is connected on frame by the first bearing pin, and the other end is connected on the 3rd bearing block by the second bearing pin.
Polytetrafluoroethylmicroporous microporous membrane high accuracy calender, also comprise servo electrical machinery system, precision speed reduction device, precision lead screw, nut, ramp piece and lower inclined plane piece that PLC controls; Described ramp piece and the lower inclined plane piece structure that is connected as a single entity, the upper horizontal plane of ramp piece is connected on the clutch shaft bearing seat; Described lower inclined plane piece forms transmission by nut and precision lead screw engagement; Described precision lead screw is connected with the servo electrical machinery system that PLC controls with precision speed reduction device successively.
Polytetrafluoroethylmicroporous microporous membrane high accuracy calender, also comprise fuel tank, gas-liquid booster pump and related valve loop, and hydraulic cylinder is connected with related valve loop, gas-liquid booster pump, fuel tank successively.
As shown in Figure 3, polytetrafluoroethylmicroporous microporous membrane high accuracy calender, also comprise the guiding Fixed width mould be connected on frame; Described guiding Fixed width mould comprises arrival end and the port of export, by extrudate, through arrival end, to the port of export, is admitted to upper stretcher roll and bottom calender roll cylinder porch; Arrival end is provided with guide channel between the port of export, and the shape of cross section of guide channel progressively is transited into from the circle of arrival end the rectangle that the port of export is flat, the width of guide channel from the arrival end to the port of export from 20mm gradually broadening to 200mm.Polytetrafluoroethylmicroporous microporous membrane high accuracy calender, also comprise guide roller, and described guide roller is located at the below in the exit of stretcher roll and bottom calender roll cylinder.Force like this calendered sheeting that a larger wrap angle sigma, the present embodiment α=120 ° are arranged on the bottom calender roll cylinder.
Transmission mechanism comprises speed synchronous control system, motor, reductor and the shaft coupling that two covers connect successively, and two sets of transmission mechanism are connected with bottom calender roll cylinder axle with upper stretcher roll axle by shaft coupling respectively.
The material of upper stretcher roll and bottom calender roll cylinder is the heat-resisting alloy forged steel; The draw ratio of upper stretcher roll and bottom calender roll cylinder all is less than 1; The surface of upper stretcher roll and bottom calender roll cylinder is all plated and is coated with the cloudy surface hard chrome, and the surface roughness of upper stretcher roll and bottom calender roll cylinder is 1.5 μ m.
3000 rev/mins of the present embodiment servomotor rotating speeds, total reduction ratio i=4800:1, screw mandrel pitch p=1.5, inclined-plane slope: h/b=1/50, servomotor often turns 160 and turns, and the screw nut driving pair can drive top chock 6 by oblique mechanism and rises or descend 1 micron, realizes the adjustment of micron order gap; Set linear velocity 10m/min, PTFE charging bar diameter
can produce wide 300mm, thickness 100 ± 1 μ m calendered sheetings.
Claims (10)
1. a polytetrafluoroethylmicroporous microporous membrane high accuracy calender, comprise frame, transmission mechanism, upper stretcher roll and bottom calender roll cylinder, transmission mechanism can drive stretcher roll and bottom calender roll cylinder move toward one another, upper stretcher roll and bottom calender roll cylinder are located on frame, it is characterized in that: also comprise: be located at the telescopic mechanism at stretcher roll two ends, the clutch shaft bearing that is located at the stretcher roll two ends and corresponding clutch shaft bearing seat and be located at the second bearing and corresponding second bearing block at bottom calender roll cylinder two ends; Telescopic mechanism one end is connected on frame, and the other end and clutch shaft bearing seat are connected, and the second bearing block is connected on frame.
2. polytetrafluoroethylmicroporous microporous membrane as claimed in claim 1 high accuracy calender is characterized in that: also comprise the elastomeric element that is located at the stretcher roll two ends and be located at the 3rd bearing and corresponding the 3rd bearing block at stretcher roll axle two ends; Described elastomeric element one end is connected on frame by the first bearing pin, and the other end is connected on the 3rd bearing block by the second bearing pin.
3. polytetrafluoroethylmicroporous microporous membrane as claimed in claim 1 or 2 high accuracy calender, is characterized in that: also comprise servo electrical machinery system, precision speed reduction device, precision lead screw, nut, ramp piece and lower inclined plane piece that PLC controls; Described ramp piece and the lower inclined plane piece structure that is connected as a single entity, the upper horizontal plane of ramp piece is connected on the clutch shaft bearing seat; Described lower inclined plane piece forms transmission by nut and precision lead screw engagement; Described precision lead screw is connected with the servo electrical machinery system that PLC controls with precision speed reduction device successively.
4. polytetrafluoroethylmicroporous microporous membrane as claimed in claim 1 or 2 high accuracy calender, it is characterized in that: telescopic mechanism is hydraulic cylinder, and described hydraulic cylinder is connected on frame, its piston rod is connected with the clutch shaft bearing seat.
5. polytetrafluoroethylmicroporous microporous membrane as claimed in claim 4 high accuracy calender is characterized in that: also comprise fuel tank, exert pressure pressure-retaining system and related valve loop, hydraulic cylinder is connected with related valve loop, the pressure-retaining system of exerting pressure, fuel tank successively.
6. polytetrafluoroethylmicroporous microporous membrane as claimed in claim 5 high accuracy calender, it is characterized in that: the described pressure-retaining system of exerting pressure is small-sized hydraulic station or gas-liquid booster pump.
7. polytetrafluoroethylmicroporous microporous membrane as claimed in claim 1 or 2 high accuracy calender, is characterized in that: also comprise the guiding Fixed width mould be connected on frame; Described guiding Fixed width mould comprises arrival end and the port of export, by extrudate, through arrival end, to the port of export, is admitted to upper stretcher roll and bottom calender roll cylinder porch; Arrival end is provided with guide channel between the port of export, and the shape of cross section of guide channel progressively is transited into from the circle of arrival end the rectangle that the port of export is flat, the width of guide channel from the arrival end to the port of export from 10～35mm broadening to 120～400mm gradually.
8. polytetrafluoroethylmicroporous microporous membrane as claimed in claim 7 high accuracy calender, it is characterized in that: also comprise guide roller, described guide roller is located at the below in the exit of stretcher roll and bottom calender roll cylinder.
9. polytetrafluoroethylmicroporous microporous membrane as claimed in claim 1 or 2 high accuracy calender, it is characterized in that: described transmission mechanism comprises speed synchronous control system, motor, reductor and the shaft coupling that two covers connect successively, and two sets of transmission mechanism are connected with bottom calender roll cylinder axle with upper stretcher roll axle by shaft coupling respectively.
10. polytetrafluoroethylmicroporous microporous membrane as claimed in claim 1 or 2 high accuracy calender is characterized in that: the material of upper stretcher roll and bottom calender roll cylinder is the heat-resisting alloy forged steel; The draw ratio of upper stretcher roll and bottom calender roll cylinder all is less than 1; The surface of upper stretcher roll and bottom calender roll cylinder is all plated and is coated with the cloudy surface hard chrome, and the surface roughness of upper stretcher roll and bottom calender roll cylinder is 0.08～3.2 μ m.
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| CN201310442747.8A CN103448189B (en) | 2013-09-25 | 2013-09-25 | A kind of polytetrafluoroethylmicroporous microporous membrane calender |
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| CN201310442747.8A CN103448189B (en) | 2013-09-25 | 2013-09-25 | A kind of polytetrafluoroethylmicroporous microporous membrane calender |
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| CN103448189B CN103448189B (en) | 2016-01-20 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105500576A (en) * | 2014-10-10 | 2016-04-20 | 住友橡胶工业株式会社 | Manufacturing device for rubber strip |
| CN108453981A (en) * | 2018-02-24 | 2018-08-28 | 深州市工程塑料有限公司 | Heavy metal ion adsorbed film continuous calendering equipment and the method for preparing adsorbed film with it |
| CN112519072A (en) * | 2020-11-23 | 2021-03-19 | 德清新源恒塑料科技有限公司 | Polytetrafluoroethylene film calender |
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| US3600747A (en) * | 1969-05-21 | 1971-08-24 | Firestone Tire & Rubber Co | System for calender control |
| CN102161222A (en) * | 2011-01-05 | 2011-08-24 | 鑫永铨股份有限公司 | Continuous extruding and rolling method of silica gel |
| CN203557611U (en) * | 2013-09-25 | 2014-04-23 | 中材科技股份有限公司 | High-precision calender for polytetrafluoroethylene microporous film |
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2013
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Patent Citations (3)
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| US3600747A (en) * | 1969-05-21 | 1971-08-24 | Firestone Tire & Rubber Co | System for calender control |
| CN102161222A (en) * | 2011-01-05 | 2011-08-24 | 鑫永铨股份有限公司 | Continuous extruding and rolling method of silica gel |
| CN203557611U (en) * | 2013-09-25 | 2014-04-23 | 中材科技股份有限公司 | High-precision calender for polytetrafluoroethylene microporous film |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105500576A (en) * | 2014-10-10 | 2016-04-20 | 住友橡胶工业株式会社 | Manufacturing device for rubber strip |
| CN105500576B (en) * | 2014-10-10 | 2020-02-07 | 住友橡胶工业株式会社 | Rubber strip manufacturing device |
| CN108453981A (en) * | 2018-02-24 | 2018-08-28 | 深州市工程塑料有限公司 | Heavy metal ion adsorbed film continuous calendering equipment and the method for preparing adsorbed film with it |
| CN108453981B (en) * | 2018-02-24 | 2024-01-30 | 深州市工程塑料有限公司 | Heavy metal ion adsorption film continuous calendaring equipment and method for preparing adsorption film by using same |
| CN112519072A (en) * | 2020-11-23 | 2021-03-19 | 德清新源恒塑料科技有限公司 | Polytetrafluoroethylene film calender |
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Effective date of registration: 20200303 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: 210012, No. 30, Xi An Road, Yuhua West Road, Jiangsu, Nanjing Patentee before: Sinoma Science & Technology Co.,Ltd. |
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