CN203527865U - Casting sheet forming and cooling device for film production line - Google Patents
Casting sheet forming and cooling device for film production line Download PDFInfo
- Publication number
- CN203527865U CN203527865U CN201320724046.9U CN201320724046U CN203527865U CN 203527865 U CN203527865 U CN 203527865U CN 201320724046 U CN201320724046 U CN 201320724046U CN 203527865 U CN203527865 U CN 203527865U
- Authority
- CN
- China
- Prior art keywords
- cooling roll
- roll
- sharp
- sparge pipe
- sharp cooling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000001816 cooling Methods 0.000 title claims abstract description 130
- 238000004519 manufacturing process Methods 0.000 title abstract description 4
- 238000005266 casting Methods 0.000 title abstract 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 238000005507 spraying Methods 0.000 claims abstract description 11
- 238000000465 moulding Methods 0.000 claims description 16
- 238000013016 damping Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 238000001179 sorption measurement Methods 0.000 claims description 2
- 239000007921 spray Substances 0.000 abstract description 7
- 239000000126 substance Substances 0.000 abstract description 2
- 239000000498 cooling water Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 229920000642 polymer Polymers 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
- B29C48/914—Cooling of flat articles, e.g. using specially adapted supporting means cooling drums
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/919—Thermal treatment of the stream of extruded material, e.g. cooling using a bath, e.g. extruding into an open bath to coagulate or cool the material
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The utility model aims to provide a casting sheet forming and cooling device for a film production line, which includes a die head, a sheet attaching device, a water tank, a stripping roller device and a chilling roller mounted inside the water tank, wherein the die head and the stripping roller device are mounted on the two upper sides of the chilling roller respectively, and are positioned above the water tank; the sheet attaching device is mounted between the die head and the chilling roller; a cold water flow channel is arranged inside the chilling roller in the circumferential direction of the roller body; the casting sheet forming and cooling device further comprises more than one group of spray pipes; the spray pipes are straight pipes arranged inside the water tank, and uniformly surround the circumference of the chilling roller; the axial directions of the spray pipes are parallel to that of the chilling roller; a plurality of spraying holes are formed in the sides of the spraying pipes, facing the chilling roller. According to the utility model, the spray pipe cooling device is additionally arranged inside the water tank, one surface of the thick sheet, near to the chilling roller, as well as the other surface of the thick sheet, far from the chilling roller, are same cooled at the same time, so that the cooling temperatures of the two surfaces of the thick sheet are kept identical, as a result, the physical and chemical performances of the two surfaces of the thick sheet are approximately the same, and the cooling and forming quality of the thick sheet is improved.
Description
Technical field
The utility model relates to plastic film production lines, the slab cooling device that particularly slab machine is used.
Background technology
In production of plastic film, after polymer high-temperature fusant leaves die head, by means of the External Force Acting of tab device, be attached to rapidly on the sharp cooling roll surface of low temperature, best bright finish, chromium plating and carry out cooling forming.Because high-temperature fusant and sharp cooling roll can carry out heat exchange in time, melt is cooled rapidly, and when it is after stripper roll device is peeled off, just forms solid sheet, and this process is called slab process.What slab process generally adopted cooling means at present is cold roller method, in sharp cooling roll, pass into cooling water, External Force Acting by the polymer high-temperature fusant of extruding by die head by means of tab device, be attached to rapidly and on sharp cooling roll surface, carry out cooling forming, and then enter posterior drawing system through stripper roll, guide roller.But cooling owing to belonging to one side after employing said method, be that the one side that sheet is pressed close to sharp cooling roll obtains fully cooling, and the another side that deviates from sharp cooling roll does not obtain cooling, so the degree of crystallinity on sheet two sides, crystal grain thickness have certain difference, sheet is thicker, and difference is just more serious, because density difference can cause the serious warpage of sheet, form the quality that chill mark has influence on sheet, even cannot carry out next step stretching.
In order to improve the cooling effect of sheet, strengthen the cooling effect that sheet deviates from sharp cooling roll another side, prior art has been developed cold roller-tank method cooling technology: the sharp cooling roll that passes into cooling water is placed in the tank that cooling water is housed, the polymer high-temperature fusant that die head is extruded by means of the External Force Acting of tab device be attached on sharp cooling roll surface, introduce again in water, carry out two-sided cooling, then the guide roller in being dipped in tank carries out further cooling forming, then through extruding, dewaters, blows water traction and enter posterior drawing system.This kind of technology belongs to two-sided cooling, but because tank volume is larger, the water temperature in tank cannot remain consistent with sharp cooling roll surface temperature, and cooling effect will not reach requirement, and the Forming Quality of sheet is still had to considerable influence.
Utility model content
The utility model aims to provide a kind of slab moulding cooling device of film line, and the chilling temperature on sheet two sides is consistent, thereby allows the performance on sheet two sides approach, and improves the quality of the cooling forming of sheet.
For achieving the above object, the technical solution of the utility model is: the slab moulding cooling device of film line comprises tank, die head, tab device, stripper roll device and is arranged on the sharp cooling roll in tank; Described die head, stripper roll device are installed on respectively the both sides of sharp cooling roll and locate on the upper side, are positioned at the top of tank, and tab device is installed on position between die head and sharp cooling roll; In described sharp cooling roll, be provided with the cold water runner along the circumferential layout of roll body, also comprise more than one group sparge pipe, described sparge pipe is straight type pipe, be arranged in tank, be positioned at sharp cooling roll near a side of die head, the axially parallel of the axial and sharp cooling roll of sparge pipe, sparge pipe has a plurality of hole for water sprayings towards a side of sharp cooling roll.
Described sparge pipe is located near die head one side, because high near the sheet temperature of this side of die head, easily make this side tank temperature drift, water temperature and sharp cooling roll surface temperature in this side tank are differed greatly, sheet distortion is often more serious in this side, therefore the present invention sprays temperature and the identical cooling water of cooling water temperature in sharp cooling roll by sparge pipe, sheet is carried out to auxiliary temperature-reducing, the chilling temperature on sheet two sides is consistent, guarantees that sheet has good Forming Quality.
Preferably, the left and right sides of described sharp cooling roll is all provided with more than one group sparge pipe, and the sparge pipe of respectively organizing of same side is communicated with by water inlet pipe.In the left and right sides of sharp cooling roll, all spray temperature and the identical cooling water of cooling water temperature in sharp cooling roll, further promoted the uniformity of sheet two sides chilling temperature, promoted sheet Forming Quality.
Described water inlet pipe is provided with two, is communicated with respectively with the two ends of each group sparge pipe, and it is shaped as circular arc, circumscribed polygon or inscribed polygon, matches with the shape of sharp cooling roll.When it is shaped as circular arc, its center of circle preferably overlaps with the roll surface center of circle of sharp cooling roll.Such design is intake simultaneously and can be guaranteed pressure and the speed of cooling water flow by both sides, sheet is obtained quick and fully cooling, pressure, the underfed problem very few, that do not reach cooling effect of spraying water while avoiding causing because jet pipe is long cooling water to flow into far-end.
Described tank is provided with overflow pipe away from a side of sharp cooling roll, overflow pipe install after filtration with cooling device after, be communicated with water inlet pipe, like this design realized recycling of water trough inner water, greatly saved water resource.
Further preferred version is: the both sides of described sharp cooling roll are all provided with the sparge pipe of 3-7 group.The sparge pipe of 3-7 group designs, and has more covered the area of sheet, has further increased the uniformity of sheet both sides chilling temperatures, makes sheet have best Forming Quality.
Described sparge pipe is connected by pipe joint with water inlet pipe, is convenient to sparge pipe dismounting, cleans.
The top of the sharp cooling roll described in the slab moulding cooling device of described film line, sharp cooling roll is installed between die head and stripper roll device except damping roller and the sharp cooling roll air knife that dewaters, by these two devices, remove the water on sharp cooling roll surface, make the polymer high temperature melting physical efficiency that stays in die head under tab device auxiliary, better fit in sharp cooling roll surface.
Described sparge pipe length is consistent with sharp cooling roll gauge, makes sheet obtain maximum water spray cooling, has avoided waste simultaneously.
The hole for water spraying of offering on described sparge pipe is Long Circle.
Described tab device is air knife tab device, electrostatic paster adsorption device or vacuum suction apparatus, or other the sheet that can promote fits in the device of sharp cooling roll; The preferred tag air knife of the present invention, when making sheet laminating sharp cooling roll, also plays the effect of cooling sheet in advance.
On the filter or cooling device being communicated with in described tank, with overflow pipe, be provided with water replanishing device, described water replanishing device is controlled by liquid level ball valve, when liquid level is when controlling ball valve, gives whole system automatic makeup filled water amount.
The beneficial effects of the utility model are:
1, by increase sparge pipe in tank, when sheet obtains even effective cooling near the one side of sharp cooling roll, making sheet deviate from sharp cooling roll another side obtains identical cooling equally, the chilling temperature on sheet two sides is consistent, thereby the physics on sheet two sides, chemical property are approached, promote the cooling forming quality of sheet.
2, by the sparge pipe structure of decision design, the chilling temperature that makes sheet two sides is uniformity more, thereby has further promoted the cooling forming quality of sheet.
Accompanying drawing explanation:
The structural representation of the slab moulding cooling device of a kind of film line that Fig. 1 the utility model embodiment provides;
The structural representation of the sparge pipe that Fig. 2 the utility model embodiment provides.
1-tank, 2-die head, 3-tab device, 4-sharp cooling roll, 5-stripper roll device, 6-sparge pipe, 7-hole for water spraying, 8-water inlet pipe, 9-overflow pipe, 10-pipe joint, 11-sharp cooling roll is except damping roller, 12-sharp cooling roll air knife that dewaters, 13-deflector roll, 14-the pressure roller that dewaters, 15-blowoff valve, 16-sheet.
The specific embodiment
Below in conjunction with accompanying drawing, illustrate the utility model.
Embodiment 1
As shown in Figure 1 and Figure 2, the slab moulding cooling device of film line, comprises tank 1, die head 2, tab device 3, stripper roll device 5 and is arranged on the sharp cooling roll 4 in tank 1; Described die head 2, stripper roll device 5 are installed on respectively the both sides of sharp cooling roll 4 and locate on the upper side, are positioned at the top of tank 1, and tab device 3 is installed on position between die head 2 and sharp cooling roll 4; In described sharp cooling roll 4, be provided with the cold water runner along the circumferential layout of roll body; The left and right sides of described sharp cooling roll 4 is all provided with sparge pipe 6, left side is provided with 7 groups, right side is provided with 5 groups, described sparge pipe 6 is straight type pipe, be arranged in tank 1, the axially parallel of the axial and sharp cooling roll of sparge pipe 6, sparge pipe 6 has a plurality of hole for water sprayings 7 towards a side of sharp cooling roll 4, in the present embodiment, on every group of sparge pipe, there are 16 hole for water sprayings 7.The sparge pipe 6 of respectively organizing of same side connects by water inlet pipe 8, described water inlet pipe 8 is provided with two, is communicated with respectively with the two ends of each group sparge pipe 6, and it is shaped as circular arc, its center of circle overlaps with the center of circle of sharp cooling roll 4 roll surfaces, and described sparge pipe 6 length are consistent with sharp cooling roll 4 gauges.
As shown in Figure 1, the bottom of described tank 1 is provided with overflow pipe 9, overflow pipe 9 install after filtration and cooling device after, be communicated with water inlet pipe 8.Tank 1 bottom is provided with blowoff valve 9.Water in tank, after overflow pipe 9, after filtration, cooling, is transmitted back to water inlet pipe 8, and ejection from sparge pipe 6, recycles thereby realize.
Tank 1 is provided with water replanishing device, and described water replanishing device is controlled by liquid level ball valve, when liquid level is when controlling ball valve, when the damage by water of 1 li of tank consumes when large, gives whole system automatic makeup filled water amount.
The blowoff valve 9 of tank 1 bottom can be used to sewage effluent, is convenient to cleaning sink 1.
As shown in Figure 2, described sparge pipe 6 is connected by pipe joint 10 with water inlet pipe 8.The hole for water spraying 7 of offering on described sparge pipe 6 is Long Circle.
As shown in Figure 1, the top of described sharp cooling roll 4 is provided with sharp cooling roll except damping roller 11 and the sharp cooling roll air knife 12 that dewaters between die head 2 and stripper roll device 5.
As shown in Figure 1, the below of pressing close to sharp cooling roll 4 and being positioned at die head 2 is provided with tab device 3, and described tab device 3 is tag air knife, by blowing out gases at high pressure, make sheet good fit in sharp cooling roll 4 surfaces.
As shown in Figure 1, the bottom of tank 1 is provided with blowoff valve 15, for getting rid of the sewage of tank 1, is convenient to changing the cooling water in tank 1.
The course of work of the present embodiment is achieved in that
Horizontal plane in tank 1 is controlled to 210 °, sharp cooling roll 4 angle of circumference to be located, the polymer high-temperature fusant that die head 2 is extruded is attached on sharp cooling roll 4 surfaces by means of the External Force Acting of tab device 3, form sheet 16, sheet 16 along with the rotation of sharp cooling roll 4, enter in water, carry out cooling, simultaneously sparge pipe 6 ejection temperature and the identical cooling water of cooling water temperature in sharp cooling roll 4, the one side that now sheet 16 is pressed close to sharp cooling roll 4 obtains fully cooling, and sheet 16 deviates from sharp cooling roll 4 another sides, under the effect of sparge pipe 6, obtain too cooling, thereby guaranteed the cooling forming quality of sheet, after sheet 16 is peeled off by stripper roll device 5, under deflector roll 13 guiding, in tank 1, continue a cooling segment distance, then leave tank 1, by a pair of dewater pressure roller 14 and the sheet air knife that dewaters, remove the remaining globule, enter subsequent processing.
Embodiment described above is only one of embodiment of the present utility model, rather than whole embodiment.Embodiment based in the utility model, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
Claims (10)
1. a slab moulding cooling device for film line, comprises tank (1), die head (2), tab device (3), is arranged on the sharp cooling roll (4) in tank (1), and stripper roll device (5); Described die head (2), tab device (3), stripper roll device (5) are installed on respectively the both sides of sharp cooling roll (4) and locate on the upper side, are positioned at the top of tank (1), and wherein die head (2), tab device (3) are positioned at the same side of sharp cooling roll (4); Described tab device (3) is positioned between die head (1) and sharp cooling roll (4); In described sharp cooling roll (4), be provided with the cold water runner along the circumferential layout of roll body, it is characterized in that: also comprise more than one group sparge pipe (6), described sparge pipe (6) is straight type pipe, be arranged in tank (1), be positioned at sharp cooling roll (4) near a side of die head (2), the axially parallel of the axial and sharp cooling roll of sparge pipe (6), sparge pipe (6) has a plurality of hole for water sprayings (7) towards a side of sharp cooling roll (4).
2. the slab moulding cooling device of film line as claimed in claim 1, it is characterized in that: the left and right sides of described sharp cooling roll (4) is all provided with more than one group sparge pipe (6), the sparge pipe (6) of respectively organizing of same side is communicated with by water inlet pipe (8).
3. the slab moulding cooling device of film line as claimed in claim 2, it is characterized in that: described water inlet pipe (8) is provided with two, be communicated with the two ends of each group sparge pipe (6) respectively, it is shaped as circular arc, circumscribed polygon or inscribed polygon, matches with the shape of sharp cooling roll (4).
4. the slab moulding cooling device of film line as claimed in claim 2, it is characterized in that: described tank (1) is provided with overflow pipe (9) away from a side of sharp cooling roll (4), overflow pipe (9) install after filtration and cooling device after, be communicated with water inlet pipe (8).
5. the slab moulding cooling device of film line as claimed in claim 2, is characterized in that: the both sides of described sharp cooling roll (4) are all provided with the sparge pipe (6) of 3-7 group.
6. the slab moulding cooling device of film line as claimed in claim 2, is characterized in that: described sparge pipe (6) is connected by pipe joint (10) with water inlet pipe (8).
7. the slab moulding cooling device of film line as claimed in claim 1, it is characterized in that: the top of described sharp cooling roll (4), is positioned at and sharp cooling roll is installed except damping roller (11) and the sharp cooling roll air knife (12) that dewaters between die head (2) and stripper roll device (5).
8. the slab moulding cooling device of film line as claimed in claim 1, is characterized in that: described sparge pipe (6) length is consistent with sharp cooling roll (4) gauge.
9. the slab moulding cooling device of film line as claimed in claim 1, is characterized in that: the hole for water spraying (7) of offering on described sparge pipe (6) is Long Circle.
10. the slab moulding cooling device of film line as claimed in claim 1, is characterized in that: described tab device (3) is air knife tab device, electrostatic paster adsorption device or vacuum suction apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320724046.9U CN203527865U (en) | 2013-11-18 | 2013-11-18 | Casting sheet forming and cooling device for film production line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320724046.9U CN203527865U (en) | 2013-11-18 | 2013-11-18 | Casting sheet forming and cooling device for film production line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203527865U true CN203527865U (en) | 2014-04-09 |
Family
ID=50414122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320724046.9U Expired - Lifetime CN203527865U (en) | 2013-11-18 | 2013-11-18 | Casting sheet forming and cooling device for film production line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203527865U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104760260A (en) * | 2015-03-26 | 2015-07-08 | 常州回天新材料有限公司 | Cold roll of casting machine for producing sewage treatment films |
| CN107283696A (en) * | 2017-07-21 | 2017-10-24 | 江苏中大包装材料有限公司 | A kind of squash type plastic sheeting cooling device |
| CN107379356A (en) * | 2017-07-21 | 2017-11-24 | 江苏中大包装材料有限公司 | A kind of plastic sheeting cooling device |
| WO2020177206A1 (en) * | 2019-03-05 | 2020-09-10 | 桂林电器科学研究院有限公司 | Casting device for plastic film production line and air knife |
| CN114665224A (en) * | 2022-04-18 | 2022-06-24 | 四川卓勤新材料科技有限公司 | Air inlet return air nozzle assembly and efficient cooling device for back of lithium ion battery diaphragm |
-
2013
- 2013-11-18 CN CN201320724046.9U patent/CN203527865U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104760260A (en) * | 2015-03-26 | 2015-07-08 | 常州回天新材料有限公司 | Cold roll of casting machine for producing sewage treatment films |
| CN107283696A (en) * | 2017-07-21 | 2017-10-24 | 江苏中大包装材料有限公司 | A kind of squash type plastic sheeting cooling device |
| CN107379356A (en) * | 2017-07-21 | 2017-11-24 | 江苏中大包装材料有限公司 | A kind of plastic sheeting cooling device |
| CN107283696B (en) * | 2017-07-21 | 2019-11-12 | 江苏中大包装材料有限公司 | A kind of anhydrous cooling device of squash type plastic film |
| CN107379356B (en) * | 2017-07-21 | 2019-11-12 | 江苏中大包装材料有限公司 | A kind of Waterless plastic film cooling device |
| WO2020177206A1 (en) * | 2019-03-05 | 2020-09-10 | 桂林电器科学研究院有限公司 | Casting device for plastic film production line and air knife |
| CN114665224A (en) * | 2022-04-18 | 2022-06-24 | 四川卓勤新材料科技有限公司 | Air inlet return air nozzle assembly and efficient cooling device for back of lithium ion battery diaphragm |
| CN114665224B (en) * | 2022-04-18 | 2023-12-15 | 四川卓勤新材料科技有限公司 | Air inlet return nozzle assembly and efficient cooling device for back surface of lithium ion battery diaphragm |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140409 |