CN108437310A - A kind of device and its curing of rapid curing nonwoven full-disk buff - Google Patents
A kind of device and its curing of rapid curing nonwoven full-disk buff Download PDFInfo
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- CN108437310A CN108437310A CN201810654931.1A CN201810654931A CN108437310A CN 108437310 A CN108437310 A CN 108437310A CN 201810654931 A CN201810654931 A CN 201810654931A CN 108437310 A CN108437310 A CN 108437310A
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- Prior art keywords
- microwave
- oven body
- microwave oven
- nonwoven
- full
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- 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.)
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Classifications
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- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
- B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
-
- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
- B29C35/045—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using gas or flames
-
- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
- B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
- B29C2035/0855—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using microwave
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Thermal Sciences (AREA)
- Electromagnetism (AREA)
- Toxicology (AREA)
- Treatment Of Fiber Materials (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
Abstract
The present invention relates to a kind of devices of rapid curing nonwoven full-disk buff, including microwave oven body, microwave generator, microwave tube and rotating mechanism, microwave oven body is the box typed structure of single-open, fire door is installed in the opening of microwave oven body, it is from top to bottom sequentially installed with more microwave tubes on the two opposite side walls in inside of microwave oven body, microwave generator is mounted on the lateral wall of microwave oven body, microwave generator is connected with microwave tube, rotating mechanism is set to the lower section of microwave oven body, turntable is installed on the bottom surface of microwave oven body, the output end of rotating mechanism is sequentially connected with turntable；Also disclose its curing.The advantage of the invention is that：Change the oven heating of traditional heat transfer, so that the production time that epoxy meets material finish wheel product is greatly shortened, reduces for about 2/3rds baking production time, Power dissipation reductions about one third, the high ambient temperature problem of original mode is changed, such mode will not cause high ambient temperature.
Description
Technical field
The present invention relates to nonwoven full-disk buff production technical field, especially a kind of dress of rapid curing nonwoven full-disk buff
It sets and its curing.
Background technology
For nonwoven full-disk buff manufacturing, it is substantially at present with epoxy resin and modified resin, polyurethane resin
Curing molding is carried out with different curing agent, curing process is all to toast form, this curing mode solidification with traditional baking oven
Period is longer, and cure cycle needs 6~12 hours, seriously restricts the raising of production efficiency.And the speed that heat is transmitted is slow, meeting
Polishing wheel product inside and outside temperature difference is caused, thermal stress is generated, destroys and influence the performance of product, and the production technology of such mode
Environment temperature is high, and not environmentally, energy consumption is high.
Invention content
It is an object of the invention to overcome the prior art, a kind of device of rapid curing nonwoven full-disk buff is provided
And its curing, change the oven heating of traditional heat transfer, when making the production of epoxy composite material polishing wheel product
Between greatly shorten, reduce for about 2/3rds baking production time, Power dissipation reductions about one third changes original mode
High ambient temperature problem, such mode will not cause high ambient temperature.
The purpose of the present invention is achieved through the following technical solutions：A kind of device of rapid curing nonwoven full-disk buff, packet
Microwave oven body, microwave generator, microwave tube and rotating mechanism are included, the microwave oven body is the box typed structure of single-open,
The opening of microwave oven body is equipped with fire door, is from top to bottom sequentially installed on the two opposite side walls in inside of the microwave oven body
More microwave tubes, the microwave generator are mounted on the lateral wall of microwave oven body, and the microwave generator is connected with microwave tube,
The rotating mechanism is set to the lower section of microwave oven body, and turntable, the rotating mechanism are equipped on the bottom surface of the microwave oven body
Output end and turntable be sequentially connected.
Further, the frequency of the microwave generator is 300MHz~300GHz.
Further, metal is further fixed on the inner wall of the microwave oven body to prevent slipping through the net.
Further, it is further fixed on heating compartment at the top of the microwave oven body, is installed on the side wall of the heating compartment
Having heaters is equipped with the dedusting fan that extraneous air can be introduced to heating compartment, heater box at the top of the heating compartment
Side of the body far from heater is equipped with circulating fan, and the outlet of the entrance and heating compartment of the circulating fan connects, described
It is connected to inside the outlet of circulating fan and microwave oven body, discharge duct, the exhaust is also equipped at the top of the microwave oven body
It is connected to inside pipeline and microwave oven body.
Further, the rotating mechanism includes electric rotating machine, retarder and rotary shaft, and the electric rotating machine is fixedly mounted
At the upper side of pedestal, drive pulley is installed on the output shaft of the electric rotating machine, the retarder is fixedly mounted on pedestal
The top other side, driven pulley is equipped on the input shaft of the retarder, and the drive pulley is logical with driven pulley
Belt transmission connection is crossed, driving gear is installed on the output shaft of the retarder, the rotary shaft is vertically-mounted, and rotary shaft
Lower end driven gear is installed, the driving gear is connect with driven gear by Toothed Belts Gearing, the upper end of the rotary shaft
It is fixedly connected with turntable.
Further, control cabinet is also installed on the side wall of microwave oven body, the control cabinet occurs with microwave respectively
Device, heater, circulating fan, dedusting fan and electric rotating machine control connection.
Further, melt pit is provided with below the microwave oven body, the rotating mechanism is set in melt pit, the melt pit
Upper surface it is concordant with ground, and melt pit entrance is provided on the upper surface of melt pit.
A kind of curing of the device of rapid curing nonwoven full-disk buff, includes the following steps：
S1, the brandreth equipped with nonwoven full-disk buff to be baked is pushed into microwave oven body, and is fixed on corresponding rotation
On platform；
S2, fire door is closed, starts rotating mechanism so that turntable is with the brandreth equipped with nonwoven full-disk buff to be baked
Rotated with certain speed, while starting microwave generator, control the power of microwave oven body between 10~80KW, temperature 60~
Between 180 DEG C, heating time is 1.5~3h；
S3, stop heating, open fire door, after nonwoven full-disk buff natural cooling, take out, complete baking.
Further, in step s 2, further include the steps that using Cycling hot-blast heating, the specific steps are：Opening heater,
Dedusting fan and circulating fan, heater heat the air introduced in heating compartment by dedusting fan, then by recycling
Air after heating is introduced microwave oven body by wind turbine, and auxiliary heating is carried out to nonwoven full-disk buff, then through discharge duct by air
Discharge.
Further, alternately, alternate interval time is 1~5min, control for Cycling hot-blast heating and microwave heating
Return difference is 1~10 DEG C.
The present invention has the following advantages：
1, the oven heating for changing traditional heat transfer is aided with Cycling hot-blast heating using microwave heating, makes epoxy
The production time for meeting material finish wheel product greatly shortens, and reduces for about 2/3rds baking production time, is ensureing to produce
Under the premise of product cured effect, shorten the baking-curing time, product is come out of the stove ahead of time.
2, homogeneous heating of the invention so that the consolidated structures of nonwoven full-disk buff evenly, imitate by rubbing down polishing consistency
Fruit is more preferably.
3, metal is arranged on microwave oven body inner wall and prevents slipping through the net by the present invention, prevents microwave leakage, microwave leakage amount is in fire door
Outer 5 centimeters are about 1mw/cm2, far below national standard≤5mw/cm2。
4, energy conservation and environmental protection, Power dissipation reductions about one third, changes the high ambient temperature problem of original mode, such mode
It will not cause high ambient temperature.
Description of the drawings
Fig. 1 is the structural diagram of the present invention one；
Fig. 2 is the structural schematic diagram two of the present invention；
Fig. 3 is enlarged structure schematic diagram at A in Fig. 2；
Fig. 4 is that the rotating mechanism of the present invention is mounted on the structural schematic diagram in melt pit；
In figure：1- microwave oven bodies, 2- microwave generators, 3- microwave tubes, 4- fire doors, 5- rotating mechanisms, 6- turntables, 7- rows
Feed channel, 8- heating compartments, 9- heaters, 10- circulating fans, 11- dedusting fans, 12- metals are anti-to slip through the net, 13- melt pits, 14-
Melt pit entrance, 15- pedestals, 16- electric rotating machines, 17- drive pulleys, 18- retarders, 19- driven pulleies, 20- belts,
21- driving gears, 22- rotary shafts, 23- driven gears, 24- tooth bands.
Specific implementation mode
The present invention will be further described below in conjunction with the accompanying drawings, but protection scope of the present invention is not limited to following institute
It states.
As depicted in figs. 1 and 2, a kind of device of rapid curing nonwoven full-disk buff, including microwave oven body 1, microwave occur
Device 2, microwave tube 3 and rotating mechanism 5, the microwave oven body 1 is the box typed structure of single-open, in the opening of microwave oven body 1
Place is equipped with fire door 4, and fire door 4 is clamshell doors, and have can lock structure, on the two opposite side walls in inside of the microwave oven body 1
More microwave tubes 3 are from top to bottom sequentially installed with, the microwave generator 2 is mounted on the lateral wall of microwave oven body 1, described micro-
Wave producer 2 is connected with microwave tube 3, and microwave tube 3 is horizontally disposed, and the rotating mechanism 5 is set to the lower section of microwave oven body 1, described
Turntable 6 is installed, turntable 6 is mounted on by bearing on the bottom surface of microwave oven body 1, turntable 6 on the bottom surface of microwave oven body 1
It can be rotated relative to the bottom surface of microwave oven body 1, output end and the turntable 6 of the rotating mechanism 5 are sequentially connected.
Further, the frequency of the microwave generator 2 is 300MHz~300GHz, i.e., wavelength is in 100cm~1mm ranges
The interior electromagnetic wave between infrared between radio wave.Microwave heating is the conduction by heat radiation from outward appearance to inner essence by external heat source
Formula heats, and has short heating cycle, homogeneous heating, product machinery and good physical properties etc. excellent relative to traditional mode of heating
Gesture.
Further, be further fixed on that metal is anti-to slip through the net 12 on the inner wall of the microwave oven body 1, metal is anti-slip through the net 12 aperture
Less than 3mm, microwave can be shielded completely, prevent microwave leakage.
Further, the top of the microwave oven body 1 is further fixed on heating compartment 8, pacifies on the side wall of the heating compartment 8
Equipped with heater 9, the top of the heating compartment 8 is equipped with the dedusting fan 11 that extraneous air can be introduced to heating compartment 8,
Side of the heating compartment 8 far from heater 9 is equipped with circulating fan 10, entrance and the heating compartment 8 of the circulating fan 10
The outlet of outlet connection, the circulating fan 10 is connected to 1 inside of microwave oven body, and the top of the microwave oven body 1 is also equipped with
Discharge duct 7, the discharge duct 7 are connected to 1 inside of microwave oven body.
Further, as shown in figure 3, the rotating mechanism 5 includes electric rotating machine 16, retarder 18 and rotary shaft 22, institute
It states electric rotating machine 16 and 15 upper side of pedestal is fixedly mounted, drive pulley is installed on the output shaft of the electric rotating machine 16
17, the retarder 18 is fixedly mounted on the 15 top other side of pedestal, and driven skin is equipped on the input shaft of the retarder 18
Belt wheel 19, the drive pulley 17 are sequentially connected with driven pulley 19 by belt 20, the output shaft of the retarder 18
On driving gear 21 is installed, the rotary shaft 22 is vertically-mounted, and the lower end of rotary shaft 22 is equipped with driven gear 23, described
Driving gear 21 is sequentially connected with driven gear 23 by tooth band 24, and the upper end of the rotary shaft 22 is fixedly connected with turntable 6.
Further, control cabinet is also installed on the side wall of microwave oven body 1, the control cabinet occurs with microwave respectively
Device 2, heater 9, circulating fan 10, dedusting fan 11 and the control connection of electric rotating machine 16.
Further, as shown in figure 4, the lower section of the microwave oven body 1 is provided with melt pit 13, the rotating mechanism 5 is set to
In melt pit 13, the upper surface of the melt pit 13 is concordant with ground, and melt pit entrance 14 is provided on the upper surface of melt pit 13.
A kind of curing of the device of rapid curing nonwoven full-disk buff, includes the following steps：
S1, the brandreth equipped with nonwoven full-disk buff to be baked is pushed into microwave oven body 1, and is fixed on corresponding rotation
On platform 6；
S2, fire door 4 is closed, starts rotating mechanism 5 so that turntable 6 is with to be baked equipped with nonwoven full-disk buff
Brandreth is rotated with certain speed, while starting microwave generator 2, controls the power of microwave oven body 1 between 10~80KW, temperature
Between 60~180 DEG C, heating time is 1.5~3h；
S3, stop heating, open fire door 4, after nonwoven full-disk buff natural cooling, take out, complete baking.
Further, in step s 2, further include the steps that using Cycling hot-blast heating, the specific steps are：Open heater
9, dedusting fan 11 and circulating fan 10, heater 9 add the air introduced in heating compartment 8 by dedusting fan 11
Heat, then the air after heating is introduced into microwave oven body 1 by circulating fan 10, auxiliary heating is carried out to nonwoven full-disk buff, then pass through
Air is discharged discharge duct 7.
Further, alternately, alternate interval time is 1~5min, control for Cycling hot-blast heating and microwave heating
Return difference is 1~10 DEG C, and temperature correction is 1~10 DEG C.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
Understanding without departing from the principles and spirit of the present invention can carry out these embodiments a variety of variations, modification, replace
And modification, the scope of the present invention is defined by the appended.
Claims (10)
1. a kind of device of rapid curing nonwoven full-disk buff, it is characterised in that：Including microwave oven body (1), microwave generator
(2), microwave tube (3) and rotating mechanism (5), the microwave oven body (1) is the box typed structure of single-open, in microwave oven body
(1) opening is equipped with fire door (4), is from top to bottom installed successively on the two opposite side walls in inside of the microwave oven body (1)
There are more microwave tubes (3), the microwave generator (2) to be mounted on the lateral wall of microwave oven body (1), the microwave generator
(2) it is connected with microwave tube (3), the rotating mechanism (5) is set to the lower section of microwave oven body (1), the bottom surface of the microwave oven body (1)
On turntable (6) is installed, output end and the turntable (6) of the rotating mechanism (5) are sequentially connected.
2. a kind of device of rapid curing nonwoven full-disk buff according to claim 1, it is characterised in that：The microwave hair
The frequency of raw device (2) is 300MHz~300GHz.
3. a kind of device of rapid curing nonwoven full-disk buff according to claim 1, it is characterised in that：The micro-wave oven
Metal is further fixed on the inner wall of body (1) to prevent slipping through the net (12).
4. a kind of device of rapid curing nonwoven full-disk buff according to claim 1, it is characterised in that：The micro-wave oven
It is further fixed on heating compartment (8) at the top of body (1), having heaters (9) is installed on the side wall of the heating compartment (8), it is described to add
Extraneous air can be introduced the dedusting fan (11) of heating compartment (8), heating compartment (8) by being equipped at the top of hot tank body (8)
Side far from heater (9) is equipped with circulating fan (10), the entrance of the circulating fan (10) and going out for heating compartment (8)
Mouth connects, and is connected to inside the outlet of the circulating fan (10) and microwave oven body (1), the top of the microwave oven body (1) is also pacified
Equipped with discharge duct (7), it is connected to inside the discharge duct (7) and microwave oven body (1).
5. a kind of device of rapid curing nonwoven full-disk buff according to claim 4, it is characterised in that：The whirler
Structure (5) includes electric rotating machine (16), retarder (18) and rotary shaft (22), and pedestal (15) is fixedly mounted in the electric rotating machine (16)
Upper side is equipped with drive pulley (17), the fixed peace of the retarder (18) on the output shaft of the electric rotating machine (16)
Mounted in the other side above pedestal (15), driven pulley (19), the active are installed on the input shaft of the retarder (18)
Belt pulley (17) is sequentially connected with driven pulley (19) by belt (20), is equipped on the output shaft of the retarder (18)
Driving gear (21), the rotary shaft (22) is vertically-mounted, and the lower end of rotary shaft (22) is equipped with driven gear (23), described
Driving gear (21) is sequentially connected with driven gear (23) by tooth band (24), the upper end of the rotary shaft (22) and turntable
(6) it is fixedly connected.
6. a kind of device of rapid curing nonwoven full-disk buff according to claim 5, it is characterised in that：Microwave oven body
(1) be also installed with control cabinet on side wall, the control cabinet respectively with microwave generator (2), heater (9), circulated air
Machine (10), dedusting fan (11) and electric rotating machine (16) control connection.
7. a kind of device of rapid curing nonwoven full-disk buff according to claim 6, it is characterised in that：The micro-wave oven
Melt pit (13) is provided with below body (1), the rotating mechanism (5) is set in melt pit (13), the upper surface of the melt pit (13)
It is concordant with ground, and melt pit entrance (14) is provided on the upper surface of melt pit (13).
8. a kind of curing of the device of rapid curing nonwoven full-disk buff as described in claim 1~7 any one,
It is characterized in that：Include the following steps：
S1, the brandreth equipped with nonwoven full-disk buff to be baked is pushed into microwave oven body (1), and is fixed on corresponding turntable
(6) on；
S2, fire door (4) is closed, starts rotating mechanism (5) so that turntable (6) is equipped with nonwoven full-disk buff with to be baked
Brandreth rotated with certain speed, while starting microwave generator (2), the power of control microwave oven body (1) 10~80KW it
Between, for temperature between 60~180 DEG C, heating time is 1.5~3h；
S3, stop heating, open fire door (4), after nonwoven full-disk buff natural cooling, take out, complete baking.
9. curing according to claim 8, it is characterised in that：In step s 2, further include using Cycling hot-blast heating
The step of, the specific steps are：Heater (9), dedusting fan (11) and circulating fan (10) are opened, heater (9) is to by removing
The air that dirt wind turbine (11) introduces in heating compartment (8) is heated, then is introduced the air after heating by circulating fan (10)
Microwave oven body (1) carries out auxiliary heating to nonwoven full-disk buff, then air is discharged through discharge duct (7).
10. curing according to claim 9, it is characterised in that：Cycling hot-blast heating and microwave heating alternately,
Alternate interval time is 1~5min, and control return difference is 1~10 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810654931.1A CN108437310B (en) | 2018-06-22 | 2018-06-22 | Device for quickly curing non-woven fabric polishing wheel and curing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810654931.1A CN108437310B (en) | 2018-06-22 | 2018-06-22 | Device for quickly curing non-woven fabric polishing wheel and curing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108437310A true CN108437310A (en) | 2018-08-24 |
| CN108437310B CN108437310B (en) | 2020-07-17 |
Family
ID=63207210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810654931.1A Active CN108437310B (en) | 2018-06-22 | 2018-06-22 | Device for quickly curing non-woven fabric polishing wheel and curing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108437310B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101913121A (en) * | 2010-07-14 | 2010-12-15 | 华南理工大学 | Method for preparing non-woven fabric polishing abrasive tool with high abrasion resistance |
| CN103506581A (en) * | 2013-10-21 | 2014-01-15 | 机械科学研究总院先进制造技术研究中心 | Microwave drying equipment suitable for drying of large-size sand mold |
| CN207201852U (en) * | 2017-09-22 | 2018-04-10 | 长齐胜餐饮管理（深圳）有限公司 | Microwave hot air combined roasting plant |
-
2018
- 2018-06-22 CN CN201810654931.1A patent/CN108437310B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101913121A (en) * | 2010-07-14 | 2010-12-15 | 华南理工大学 | Method for preparing non-woven fabric polishing abrasive tool with high abrasion resistance |
| CN103506581A (en) * | 2013-10-21 | 2014-01-15 | 机械科学研究总院先进制造技术研究中心 | Microwave drying equipment suitable for drying of large-size sand mold |
| CN207201852U (en) * | 2017-09-22 | 2018-04-10 | 长齐胜餐饮管理（深圳）有限公司 | Microwave hot air combined roasting plant |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108437310B (en) | 2020-07-17 |
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Effective date of registration: 20200619 Address after: No. G11, dashishan Industrial Zone, Dongying Village Committee, Beitong Town, Yangdong District, Yangjiang City, Guangdong Province Applicant after: Guangdong Weiyi Grinding Technology Development Co., Ltd Applicant after: Guangdong Weiyi polishing material Co., Ltd Address before: 529900 East Yingcun village committee of Bei Yi Town, Yangdong District, Yangjiang, Guangdong, two C14, No. Applicant before: YANGJIANG WEIYE POLISHING MATERIAL Co.,Ltd. |
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Effective date of registration: 20211230 Address after: 529500 No. c14-2, dashishan Industrial Zone, Dongying Village Committee, Beiguan Town, Yangdong District, Yangjiang City, Guangdong Province Patentee after: YANGJIANG WEIYE POLISHING MATERIAL CO.,LTD. Address before: 529900 No. G11, dashishan Industrial Zone, Dongying Village Committee, beiinertial Town, Yangdong District, Yangjiang City, Guangdong Province (residence declaration) Patentee before: Guangdong Weiyi Grinding Technology Development Co., Ltd Patentee before: Guangdong Weiyi polishing material Co., Ltd |
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