CN1307957A - Porous metal plate making process and product - Google Patents
Porous metal plate making process and product Download PDFInfo
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- CN1307957A CN1307957A CN 00128297 CN00128297A CN1307957A CN 1307957 A CN1307957 A CN 1307957A CN 00128297 CN00128297 CN 00128297 CN 00128297 A CN00128297 A CN 00128297A CN 1307957 A CN1307957 A CN 1307957A
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 25
- 239000002184 metal Substances 0.000 title claims abstract description 25
- 238000005260 corrosion Methods 0.000 claims abstract description 35
- 230000007797 corrosion Effects 0.000 claims abstract description 35
- 239000011148 porous material Substances 0.000 claims abstract description 5
- 238000010521 absorption reaction Methods 0.000 claims description 20
- 238000005530 etching Methods 0.000 claims description 17
- 239000000243 solution Substances 0.000 claims description 16
- 238000012545 processing Methods 0.000 claims description 12
- 238000004080 punching Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 9
- 238000013461 design Methods 0.000 claims description 5
- 238000011161 development Methods 0.000 claims description 5
- 229920002120 photoresistant polymer Polymers 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000012670 alkaline solution Substances 0.000 claims description 2
- 230000000717 retained effect Effects 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims 2
- 230000002378 acidificating effect Effects 0.000 claims 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 14
- 239000010959 steel Substances 0.000 description 14
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 239000000976 ink Substances 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 6
- 229910001220 stainless steel Inorganic materials 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 239000006096 absorbing agent Substances 0.000 description 4
- 239000011358 absorbing material Substances 0.000 description 3
- 238000010425 computer drawing Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 3
- 238000003672 processing method Methods 0.000 description 3
- 230000003584 silencer Effects 0.000 description 3
- 241000194386 Coelosis Species 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The present invention relates to a method for producing microporous metal plate and its product, belonging to the field of utilizing microporous plate technology to control noise pollution. In said invention chemically corrosion method is used to produce microporous metal plate, can product lots of metal microporous plates whose pore size is 0.4mm-0.1mm and perforating rate is in the range of 10.01%-0.06% and the pore size and pitch of pores can be regulated according to the requirement. Said invented production method is simple and easy to implement, its cost is low, and its microporous plate possesses good sound-absorbing effect and wide sound-absorbing frequency band, so that it possesses extensive application field.
Description
The invention belongs to the metallic plate processing technique field, particularly belong to and utilize microperforated panel control noise pollution
Technical field.
Up to the present, the method that domestic and international production and processing metal micro-holes plate mainly adopts brill, dashes, pricks the hole, this method can only be processed the metal micro-holes plate in the above aperture of 0.5mm, almost is impossible for the hole below processing 0.4mm on the metallic plate in enormous quantities.Adopt laser technology can process the micropore acoustic board of aperture, but its cost is very expensive less than 0.4mm, and long processing time, can not extensive use.In addition, because the conventional microplates processing method is subjected to the restriction of employed mould, pore size and spacing basic fixed are difficult to adjust, so can not adjust aperture and pitch of holes arbitrarily by different instructions for uses.Theoretical according to the microwell plate sound absorption, the micropore size (aperture is less than 0.4mm) that only reduces microwell plate just may obtain good acoustically effective.At present, in field of noise control and building decoration sound-absorbing material field, the micropore size of the micropore acoustic board that extensively comes into operation is all greater than 0.5mm, its sound sucting band is narrow, absorption efficiency is low, acoustic absorptivity only is about 1 above 0.5 octave band, even littler, in addition, also because existing microwell plate can not can not change microcellular structure to obtain the most effective acoustically effective at the specific occasion by actual instructions for use conversion aperture and pitch of holes to obtain the effect of broadband, high acoustic absorption.Change as need, then processing mold was again both required great effort like this, and was also expensive.
The purpose of this invention is to provide a kind of employing corroding method porous metal plate making, use this method can process the aperture in enormous quantities and be the metal micro-holes plate below the 0.4mm, aperture on the microwell plate and pitch of holes can be adjusted arbitrarily, and simple and convenient processing method is easily gone, process time is short, and is with low cost.Adopt the microperforated panel of this method processing to have that acoustically effective is good, the advantage of acoustic frequency bandwidth, sound sucting band and sound absorption peak value can be adjusted arbitrarily by instructions for use within the specific limits.This micropore acoustic board can be widely used in occasions such as hotel, restaurant, office building, market, is the best sound absorption product in various clean places, ultra-clean workshop.
The process chart of porous metal plate making method provided by the invention as shown in Figure 1, the porous metal plate sound absorption structure is as shown in Figure 2.The porous metal plate machining process is described below: first, according to the sound absorption requirement in the engineering application, design the structural parameters of corresponding microwell plate, comprise that micropore size d, punching rate the p ratio of the gross area (area in hole with) and the hole heart are apart from b, draw corresponding micropore layout drawing (the actual black circle that should be in the hole here) with computer, make a plate into the usefulness that transparent film is prepared against exposure then.
The second, the metallic plate that at first will prepare processing cleans, and then photosensitive film against corrosion is pasted or photoresists against corrosion is coated on the tow sides of metallic plate.
The 3rd, two transparent films that are printed on the micropore layout drawing are placed on tow sides with the metallic plate of light sensitive layer against corrosion respectively, expose in the lump.
The 4th, the metallic plate after the exposure is put into developer solution carry out development treatment.After the development, the etchant resist at place, micropore position disappears, and exposes and micropore metal surface of a size, in order to the usefulness of corrosion.(adopting printing etching resisting ink method can omit second and third and the 4th step, but utilize screen printing mode, is the seal material with the etching resisting ink, directly the micropore layout drawing is imprinted on the metallic plate.)。
The 5th, carry out chemical attack.In etching tank, spray the metallic plate that showed shadow with liquor ferri trichloridi, add acid solution in the solution to accelerate cutting speed, the metallic plate behind the spray is corroded at the place, metal surface of exposing, and is retained with the etchant resist place, so just forms microwell plate.
The 6th, with clear water clean metal plate, with alkaline solution resist layer is stripped again.
After above-mentioned six steps, be processed into needed porous metal plate at last.Utilize this method can process the micropore acoustic board of aperture for 0.4mm-0.1mm, punching rate is adjusted arbitrarily in the scope of 10.01%-0.06%.The shape in hole can be a difformity arbitrarily such as circle, square, rectangle, ellipse, triangle and polygon, and smooth smooth, the no burr of acoustic board plate face, and acoustically effective is better than existing various microwell plates greatly.
For processing aperture, in the chemical attack process, the porose place, two sides of plate is cut simultaneously with accurate aperture.Because plate is opaque, wanting to make two-sided aperture alignment is unusual difficulty, if misalignment the saturating or aperture of cutting will occur and become big.For this reason, the present invention proposes the cutting process in two-sided corrosion simultaneously and the different apertures of two-sided employing, for example a surperficial aperture of going up the hole is below the 0.4mm, another surface is hole bigger more than the 0.4mm, but the center in hole must be accurately corresponding at the tow sides of metallic plate, so just than the hole on the different surfaces that is easier to align.Simultaneously, in the middle of corrosion process, adopt the etching time method of the etching time of macropore one side, can make the aperture that erodes away reach user's requirement greater than aperture one side.Also having an advantage like this, is exactly can be by user's requirement, perhaps will be than the one side of macropore as visible surface, and perhaps will be than the one side of aperture as visible surface.
Porous metal plate making method provided by the present invention has advantages such as simple and convenient processing method, process-cycle be short, cheap, made good, the acoustic frequency bandwidth of micropore acoustic board acoustically effective, can also change micropore size and pitch of holes to obtain best acoustically effective at the varying environment demand, reach intended purposes of the present invention.
Description of drawings.Fig. 1 is porous metal plate processing process figure; Fig. 2 is the microporous sound absorbing structure schematic diagram, among the figure: the 1--micropore, 2--belongs to plate, cavity behind the 3--plate, 4--rigid body (wall etc.); Fig. 3 is the microwell plate sound absorption structure schematic diagram in different apertures.
Embodiment 1. adopts chemical corrosion method to thickness of slab t=0.1mm, and the square corrosion resistant plate of 200mm * 200mm is processed, and this stainless steel micropore acoustic board will be used for occasions such as indoor sound absorption, silencer.For example, for reducing the noise in the 250Hz-1250Hz scope, require sound-absorbing material to be higher than 0.5 at the acoustic absorptivity of this frequency range.For this reason, be d=0.1mm with the aperture design of microwell plate, pitch of holes b=1mm, punching rate is 0.79%.
Concrete implementation step: 1) according to above-mentioned sound absorption requirement, the aperture of designing micropore should equal 0.1mm, and punching rate is 0.79%, distance between the hole is 1mm (calculating by square arrangement), in view of the above, can utilize computer drawing to go out this micropore layout drawing, and be printed on the transparent film.Draw a hole heart distance in addition again and be all 1mm, and the aperture is the transparent film of 0.4mm; 2) corrosion resistant plate that will corrode is placed in the cleaning machine and cleans, and removes the greasy dirt and the dust on surface, and photosensitive film against corrosion is attached on the tow sides of clean corrosion resistant plate by the heating rolling depression method; 3) transparent film that is painted with the micropore arrangement pattern that draws by aforementioned calculation is placed on the front of the corrosion resistant plate that pasted film, simultaneously will be 1) in draw good spacing 1mm, the aperture is that the transparent film of 0.4mm is placed on the reverse side of corrosion resistant plate and guarantees that the hole heart of positive and negative face aligns, and together put into exposure machine, the time for exposure is 5s.4) corrosion resistant plate after will exposing is put into 1% sodium carbonate solution and is developed, 25 ℃, time is 60s, the etchant resist of the stainless steel micropore position after the development disappears, the stainless steel surfaces in 0.1mm aperture is exposed in the corrosion resistant plate front, simultaneously, the stainless steel surfaces in 0.4mm aperture is correspondingly exposed in corrosion resistant plate reverse side and micropore corresponding position, front.5) corrosion resistant plate after will developing is put into etching tank, with Baume degrees is that 42 ° liquor ferri trichloridi sprays this corrosion resistant plate, the hydrochloric acid and the nitric acid of adding 1% in the solution, the stainless steel surfaces place of exposing will be corroded, reverse side (one side in 0.4mm aperture) etching time is 4 minutes and 10 seconds, and positive (the micropore one side in 0.1mm aperture) etching time is 1 minute and 20 seconds; 6) corrosion resistant plate after the corrosion cleans with clear water, with 3% sodium hydroxide solution resist layer is stripped again, and the striping time is 60s, and solution temperature is 60 ℃.
After taking above-mentioned 6 steps, just made desired microwell plate, utilized this microwell plate to do the sound absorber of the dark D=100mm of coelosis, as seen its acoustic absorptivity has surpassed desired index being between 0.5～0.72 between the 250Hz-1250Hz after tested.The time of processing microwell plate is 5 minutes/m
2Institute's consumption material expense is 210 yuan/m
2Under the identical situation of acoustically effective, approximately need time 24 hours/m if adopt laser means to process same micropore acoustic board
2, institute's consumption material expense is 10000 yuan/m
2
1) according to above-mentioned sound absorption requirement, the length of side of designing micropore and be square hole should equal 0.4mm, and punching rate is 1.03%, distance between the hole is 3.5mm (calculating by square arrangement), in view of the above, can utilize computer drawing to go out the micropore layout drawing, and micropore pattern is printed on the printing screen; 2) steel plate that will corrode is placed in the cleaning machine and cleans, the greasy dirt on surface, place to go and dust; 3) micropore on the silk screen is imprinted on the tow sides of steel plate with etching resisting ink, surface of steel plate is exposed at the micropore place, and other place is covered by etching resisting ink.4) steel plate that will be printed on micropore pattern is put into etching tank, is the liquor ferri trichloridi spray corrosion resistant plate of 42 ° of Baume degrees with concentration, adds 2% hydrochloric acid and nitric acid in the solution, and the corrosion resistant plate surface of exposing will be corroded, and etching time is 15 minutes; 5) after the steel plate after the corrosion washes with clear water, with 5% sodium hydroxide solution etching resisting ink is removed, going the China ink time is 90s again, and solution temperature is 40 ℃.
After taking above-mentioned 5 steps, just made desired microwell plate, by the sound absorber that this microwell plate and D=105mm cavity are formed, after tested, its acoustic absorptivity is between 0.43～0.94 in 250Hz～1000Hz scope, has as seen surpassed desired index.Be 12 minutes/m process time
2, institute's consumption material expense is 80 yuan/m
2
Embodiment 3. obtains better acoustically effective in order to make the individual layer microcellular structure, must widen the absorption band of microwell plate.For example: noise is no more than 7 seconds based on medium and low frequency for making the room reverberation time in 125Hz～1250Hz scope in the spinning power-equipment room, requires the acoustic absorptivity in frequency bandwidth is 125Hz～1250Hz scope to be not less than 0.4.For this reason, need on same microwell plate, to process the micropore in different apertures.In the present embodiment, on the square cold-rolled steel sheet of same 400mm * 400mm, process the micropore in two kinds of different apertures, to reach the effect of widening absorption band.Implementation step: 1) get the thick t=0.3mm of steel plate, high-frequency resonance (f
0=500Hz, a
Max=1) the aperture d of micropore the time
1Should equal 0.25mm, the hole heart is apart from b
1Be 3.5mm, punching rate is 0.4%; Low-frequency resonance (f
0=200Hz, a
Max=0.89) micropore size d the time
2Should equal 0.4mm, the hole heart is apart from b
2Be 14mm, punching rate is 0.06%.Like this, be the micropore of 0.25mm every 3.5mm, every three 0.25mm holes the aperture is increased to 0.4mm, two kinds of aperture combination microwell plate designs of individual layer have just been finished.On transparent film, draw out this micropore layout drawing then; 2) utilize glue spreading method, with photoresists against corrosion attached on the steel plate positive and negative; 3) two transparent films that are painted with above-mentioned micropore pattern are placed on the tow sides of the steel plate of having photoresists against corrosion, and together put into exposure machine, the time for exposure is 30s.4) steel plate after will exposing is put into 1% sodium carbonate solution and is developed, and 25 ℃, the time is 60s, and the glue against corrosion of the micropore size of the surface of steel plate micropore position after the development disappears, and exposes surface of steel plate.5) steel plate after will developing is put into etching tank, and the surface of steel plate place of exposing will be corroded, and etching time is 11 minutes and 40 seconds, and corrosion temperature is 48 ℃; 6) steel plate after the corrosion cleans with clear water, with 3% sodium hydroxide solution resist layer is stripped again, and the time of removing photoresist is 2min, and solution temperature is 60 ℃.
After taking above-mentioned 6 steps, just made desired microwell plate, by sound absorber structure such as Fig. 3 that this microwell plate and cavity D=100mm form, the test data curve shows, acoustic absorptivity is not less than 0.4 in 125Hz～1250Hz scope, has as seen reached desired index.Be 12 minutes/m process time
2, institute's consumption material expense is 130 yuan/m
2
Concrete implementation step: according to above-mentioned sound absorption requirement, the aperture of designing micropore should equal 0.075mm, and punching rate is 10.01%, distance between the hole is 0.21mm (calculating by square arrangement), in view of the above, can utilize computer drawing to go out this micropore layout drawing, and be printed on the transparent film.Draw a hole heart distance in addition again and be all 0.21mm, and the aperture is the transparent film of 0.15mm.All the other steps have just been made desired microwell plate with embodiment 1, utilize this microwell plate to do the sound absorber of the dark D=100mm of coelosis, and as seen its acoustic absorptivity has surpassed desired index being between 0.4～0.45 between the 400Hz-1250Hz after tested.The time of processing microwell plate is 5 minutes/m
2Institute's consumption material expense is 210 yuan/m
2Under the identical situation of acoustically effective, approximately need time 24 hours/m if adopt laser means to process same micropore acoustic board
2, institute's consumption material expense is 10000 yuan/m
2
Claims (3)
1. the method for a porous metal plate making, several steps in the following order carries out: the first, according to the sound absorption requirement, design the microwell plate parameter, comprise micropore size, punching rate, pitch of holes etc., draw out the micropore layout drawing, and make a plate into transparent film; The second, the metallic plate of preparing processing is cleaned, then light-sensitive surface against corrosion is attached to or photoresists against corrosion is coated on the tow sides of metallic plate; The 3rd, two transparent films that are printed on the micropore layout drawing are placed on the metallic plate tow sides of having light sensitive layer against corrosion respectively, expose in the lump; The 4th, the metallic plate after the exposure to be put into developer solution carry out development treatment, the etchant resist at the place, micropore position, back of perhaps developing disappears, and exposes the metal surface; The 5th, in etching tank, add the metallic plate that solution spraying that acidic materials make showed shadow with ferric trichloride, with the etching resisting ink metallic plate that the seal material is printed on the micropore layout drawing perhaps with this solution spraying, the metal that exposes the place, metal surface behind the spray is corroded, and is retained with the metal at etchant resist place; The 6th, with clear water clean metal plate, soak metallic plate with alkaline solution again, the stripping resist layer.
2. a micropore acoustic board is characterized in that micropore size between 0.4mm-0.1mm, and punching rate is in the 10.01%-0.06% scope, and aperture and pitch of holes are adjusted arbitrarily according to the requirement of sound absorption frequency, and the shape in hole can be an arbitrary shape.
3. according to the method for the described porous metal plate making of claim 1, the double-edged pore size of wherein said metallic plate can be inequality, but the center in hole should be accurately corresponding at the metallic plate tow sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001282972A CN1136082C (en) | 2000-12-15 | 2000-12-15 | Porous metal plate making process and product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001282972A CN1136082C (en) | 2000-12-15 | 2000-12-15 | Porous metal plate making process and product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1307957A true CN1307957A (en) | 2001-08-15 |
| CN1136082C CN1136082C (en) | 2004-01-28 |
Family
ID=4593107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001282972A Expired - Lifetime CN1136082C (en) | 2000-12-15 | 2000-12-15 | Porous metal plate making process and product |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1136082C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100458444C (en) * | 2007-03-28 | 2009-02-04 | 山东轻工业学院 | Micro-pool array chip processing method capable of being as ultra microhole analytical plate |
| WO2011009240A1 (en) * | 2009-07-24 | 2011-01-27 | 青钢金属建材股份有限公司 | Method of making micro-holes on metal plate |
| CN104989939A (en) * | 2015-07-02 | 2015-10-21 | 辽宁融达新材料科技有限公司 | Punched foamed aluminum panel and manufacturing method thereof |
| CN117556527A (en) * | 2024-01-12 | 2024-02-13 | 中国铁路设计集团有限公司 | Railway station room micropore parameter optimization method based on reverberation time control |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1039559A (en) * | 1989-04-08 | 1990-02-14 | 河北省群众艺术馆 | The preparation method of carving picture on metal by etching |
-
2000
- 2000-12-15 CN CNB001282972A patent/CN1136082C/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100458444C (en) * | 2007-03-28 | 2009-02-04 | 山东轻工业学院 | Micro-pool array chip processing method capable of being as ultra microhole analytical plate |
| WO2011009240A1 (en) * | 2009-07-24 | 2011-01-27 | 青钢金属建材股份有限公司 | Method of making micro-holes on metal plate |
| CN102439239A (en) * | 2009-07-24 | 2012-05-02 | 青钢金属建材股份有限公司 | Method of making micro-holes on metal plate |
| AU2009350309B2 (en) * | 2009-07-24 | 2012-05-24 | Ckm Applied Materials Corp. | Method of making micro-holes on metal plate |
| CN102439239B (en) * | 2009-07-24 | 2013-11-13 | 青钢金属建材股份有限公司 | Method of making micro-holes on metal plate |
| CN104989939A (en) * | 2015-07-02 | 2015-10-21 | 辽宁融达新材料科技有限公司 | Punched foamed aluminum panel and manufacturing method thereof |
| CN104989939B (en) * | 2015-07-02 | 2018-01-02 | 辽宁融达新材料科技有限公司 | One kind perforation foam aluminium plate preparation method |
| CN117556527A (en) * | 2024-01-12 | 2024-02-13 | 中国铁路设计集团有限公司 | Railway station room micropore parameter optimization method based on reverberation time control |
| CN117556527B (en) * | 2024-01-12 | 2024-03-26 | 中国铁路设计集团有限公司 | Railway station room micropore parameter optimization method based on reverberation time control |
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|---|---|
| CN1136082C (en) | 2004-01-28 |
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Effective date of registration: 20090821 Address after: No. 28, Zhenxing Road, Changping Park, Zhongguancun science and technology zone, Beijing, Changping District Patentee after: Beijing Lvchuang Acoustic Engineering Design Research Institute Co., Ltd Address before: No. 28 Zhenxing Road, Changping County, Beijing Patentee before: Beijing Luchuang Acoustic Engineering Co., Ltd. |
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Denomination of invention: Porous metal plate making process and product Effective date of registration: 20100707 Granted publication date: 20040128 Pledgee: Zhongguancun Beijing science and technology Company limited by guarantee Pledgor: Beijing Lvchuang Acoustic Engineering Design Research Institute Co., Ltd Registration number: 2010990000804 |
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Date of cancellation: 20120821 Granted publication date: 20040128 Pledgee: Zhongguancun Beijing science and technology Company limited by guarantee Pledgor: Beijing Lvchuang Acoustic Engineering Design Research Institute Co., Ltd Registration number: 2010990000804 |
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