CN110794494B - Drying box for anti-glare optical substrate - Google Patents
Drying box for anti-glare optical substrate Download PDFInfo
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- CN110794494B CN110794494B CN201911223402.7A CN201911223402A CN110794494B CN 110794494 B CN110794494 B CN 110794494B CN 201911223402 A CN201911223402 A CN 201911223402A CN 110794494 B CN110794494 B CN 110794494B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0268—Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method
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Abstract
The invention provides a diffuse reflection material and a preparation method thereof. The diffuse reflective material comprises: a substrate; the substrate comprises one or two diffuse reflection coatings, wherein the one or two diffuse reflection coatings are arranged on the substrate and are made of raw materials, the raw materials comprise modified silazane polymers, and the diffuse reflection coatings comprise SION. The front and back surfaces of the substrate may need to be prepared coated on one or both surfaces. The diffuse reflection material and the preparation method provided by the invention have better adhesive force with a substrate, friction resistance and the like, and the characteristics of the diffuse reflection coating are improved.
Description
Technical Field
The invention relates to the field of optical electronic industry, in particular to a drying box for an anti-dazzle optical substrate.
Background
Anti-glare (AG) is the atomization of the surface of a product, and can achieve a diffuse reflection effect on the light reflection of a light source or a reflective light source in the surrounding environment. The technology can greatly reduce the visual interference of the surrounding reflected image to the user, and simultaneously can greatly reduce the influence of the pollution caused by the fact that the common fingerprints are easy to accumulate on the surface. In short, the technology is used for protecting the eyes and vision of the human body so as to achieve the effects of improving the watching comfort and protecting the eyes.
The principle is that the double-side or single-side of the high-quality substrate is specially processed, so that the high-quality substrate has a lower reflectance ratio, the light reflectivity is reduced, a clear and transparent visual effect is created by using a technology, and a user can experience a better visual effect.
The traditional anti-glare coating of the optical substrate has poor characteristics, the anti-glare coating and the optical substrate have poor combination stability, low friction resistance and easy shedding.
Therefore, it is necessary to provide a drying oven for an anti-glare optical substrate to solve the above technical problems.
Disclosure of Invention
The invention provides a drying box for an anti-glare optical substrate, which solves the problems of poor combination stability, low friction resistance and easy falling of the traditional diffuse reflection coating and the substrate, and obviously improves the surface hardness of the substrate.
In order to solve the above technical problem, the present invention provides a diffuse reflection substrate, including:
a substrate;
one or two diffuse reflective coatings, one or two of said diffuse reflective coatings being disposed on said substrate.
One or both of the front and back surfaces of the substrate may need to be patterned with a diffuse reflective coating.
Preferably, the diffuse reflection coating is made of a making raw material, the making raw material comprises a modified silazane polymer, and the anti-glare coatings made of the modified silazane polymer comprise SION.
By using a modified silazane polymer as a main raw material for the coating;
has the following properties;
pencil hardness: greater than or equal to 9H;
gloss (60 ° test): 90-140 (adjustable);
transparency (visible light): greater than 91%;
adhesion (cross-hatch method): grade 0 or above;
rub resistance (1KG weight x rubber x10000 cycles): no defect;
acid resistance (10% hydrochloric acid), about one month;
Modulus：36.2Gpa；
Hardness：2.8Gpa；
binding: greater than 100 cycles (3 Φ PET);
contact Angle: greater than 100;
Accelerated weathering：98％，500hr。
a method for preparing a diffuse reflection substrate comprises the following steps:
s1: firstly, mixing and adjusting a modified silazane polymer solution and dimethylbenzene according to a ratio;
s2: cleaning the surface of a base material to be constructed;
s3: then the solution of the modified silazane polymer and the mixed solution of xylene are uniformly attached to the surface of the base material through equipment such as dip coating, spray coating, spin coating, printing and the like;
s4: and drying the prepared base material through a drying box in a manner of drying and curing at the low temperature of 150 ℃ and at the high temperature of 350-1000 ℃.
Preferably, a first fixing plate and a second fixing plate are fixedly connected between two sides of the inner wall of the drying box, a first limiting plate is fixedly connected to one side of the first fixing plate, and a compressing assembly is arranged on the second fixing plate.
Two sides of the optical substrate to be dried can be limited through the pressing assembly and the first limiting plate, and drying can not be performed in surface contact with the coating of the substrate.
Preferably, the compressing assembly comprises four sliding rods and four sliding rods, one ends of the sliding rods are fixedly connected with one side of the second fixing plate, the surface of each sliding rod is sequentially sleeved with a pushing plate and a second limiting plate from inside to outside, and the anti-slip mat is bonded on one side, opposite to the first limiting plate, of the second limiting plate.
The non-slip mat can prevent to cause the damage when first limiting plate and second limiting plate centre gripping optical substrate to it, and can improve and rub between the optical substrate, stability when improving the centre gripping.
Preferably, the pushing plate is located between the second limiting plate and the surface of the sliding rod is fixedly connected with an elastic piece, and one side of the pushing plate, which is close to the second fixing plate, is fixedly connected with a sliding rail.
Preferably, sliding connection has the slider on the slide rail, one side of slider is rotated and is connected with the bending plate, the last pot head of bending plate is equipped with the movable block, the equal fixedly connected with gag lever post in both sides of movable block, first spacing groove has been seted up to the upside on bending plate surface.
Through setting up slide rail and slider, when carrying out spacingly through rotating the folded plate to the side of optical substrate, the folded plate can drive the slider rebound to the centre department that promotes the piece when the horizontal direction promotes the slider, and is spacing through the centre department to promoting the piece, makes spacing more stable.
Preferably, the drying box is arranged between two sides of the inner wall of the drying box and is fixedly connected with a bottom supporting assembly below the first fixing plate, and the bottom supporting plate comprises two strip-shaped plates.
Preferably, a supporting block is fixedly connected between the two strip-shaped plates, an anti-slip block is bonded to the top of the supporting block, a rectangular groove is formed in the top of the second fixing plate, a protective pad is bonded to the bottom of the inner surface of the rectangular groove, and second limiting grooves are formed in one side of the second fixing plate and located on two sides of the rectangular groove.
The anti-skidding block can increase the friction between supporting shoe and the optical substrate bottom, improves the stability of placing.
The protective pad can protect the turning position of the folded plate when the folded plate rotates.
Preferably, one side of the drying box is provided with a heating device, and one side of the heating device is communicated with a gas transmission assembly.
Compared with the related art, the drying box for the anti-glare optical substrate provided by the invention has the following beneficial effects:
the invention provides a drying box for an anti-glare optical substrate, which has diversified application range, can be mainly applied to anti-glare, anti-fouling and anti-fingerprint treatment of various optical glass panels/cover plates of mobile phones, game machines, notebooks, liquid crystal screens, electronic white boards, integrated education machines, instrument boards for vehicles and ships, monitoring system protection boards, satellite navigation systems, camera lenses, medical equipment, solar photovoltaics and the like, and surface hardening and light diffusion treatment of organic glass and plastic optical materials, and can effectively prevent glare.
The coating properties were as follows:
the main components are as follows: a SION;
pencil hardness: greater than or equal to 9H;
gloss (60 ° test): 90-140 (adjustable);
transparency (visible light): greater than 91%;
adhesion (cross-hatch method): grade 0 or above;
rub resistance (1KG weight x rubber x10000 cycles): no defect;
acid resistance (10% hydrochloric acid), about one month;
Modulus：36.2Gpa；
Hardness：2.8Gpa；
binding: greater than 100 cycles (3 Φ PET);
contact Angle: greater than 100;
Accelerated weathering：98％，500hr。
drawings
Fig. 1 is a schematic structural view of a first embodiment of a drying oven for an anti-glare optical substrate according to the present invention;
FIG. 2 is a block flow diagram of a method for manufacturing a diffusely reflecting substrate according to the present invention;
FIG. 3 is a graph of the peeling off of a coated diffusely reflective substrate after a destructive scribing test;
FIG. 4 is a comparison graph of the illumination conditions of the diffuse reflection substrate and the conventional anti-glare substrate according to the present invention;
FIG. 5 is a comparison graph of the anti-smudge and anti-fingerprint effect of the diffuse reflection substrate of the present invention and a conventional optical substrate;
fig. 6 is a schematic structural diagram of a diffuse reflection substrate according to a second embodiment of the present invention;
FIG. 7 is an enlarged view of portion A of FIG. 6;
FIG. 8 is a schematic view of the external structure shown in FIG. 6;
FIG. 9 is a partial side view of the hold down assembly shown in FIG. 6;
fig. 10 is a schematic view of the structure of the installation tube shown in fig. 8.
Reference numbers in the figures: 1. the base plate, 2, diffuse reflection coating, 3, the stoving case, 4, first fixed plate, 5, the second fixed plate, 6, first limiting plate, 7, compress tightly the subassembly, 71, the slide bar, 72, the slurcam, 73, the second limiting plate, 74, the slipmat, 75, the elastic component, 76, the slide rail, 77, the slider, 78, the folded plate, 79, the movable block, 710, first spacing groove, 711, the gag lever post, 8, the bottom sprag subassembly, 81, the bar board, 82, the supporting shoe, 83, the slipmat, 9, the rectangular channel, 10, the second spacing groove, 11, the protection pad, 12, heating device, 13, the gas transmission subassembly, 131, the air pump, 132, the gas-supply pipe, 133, the connecting pipe, 134, the installation pipe, 135, the intake pipe, 136, the shower nozzle.
Detailed Description
The invention is further described with reference to the following figures and embodiments.
Referring to fig. 1, fig. 2 and fig. 3 in combination, wherein fig. 1 is a schematic structural diagram of a drying oven for an anti-glare optical substrate according to a first embodiment of the present invention; FIG. 2 is a block flow diagram of a method for manufacturing a diffusely reflecting substrate according to the present invention; FIG. 3 is a graph showing the peeling of a coated substrate after a destructive scribing test, and FIG. 4 is a graph showing the comparison of the illumination conditions of a diffuse reflection substrate provided by the present invention and a conventional optical substrate; fig. 5 is a comparison graph of the anti-smudge and anti-fingerprint of the diffuse reflection substrate provided by the invention and the existing optical substrate. A diffusely reflective substrate comprising:
a substrate 1;
one or two diffuse reflective coatings 2, one or two diffuse reflective coatings 2 being arranged on said substrate 1.
The diffuse reflection coating 2 is made of a making raw material, the making raw material comprises a modified silazane polymer, and the made coatings comprise SION.
The method comprises the following steps:
s1: firstly, mixing and adjusting a modified silazane polymer solution and dimethylbenzene according to a ratio;
s2: cleaning the surface of the optical base material to be constructed;
s3: then the solution of the modified silazane polymer and the mixed solution of xylene are uniformly attached to the surface of the base material through equipment such as dip coating, spray coating, spin coating, printing and the like;
s4: and drying the prepared base material through a drying box 3 in a manner of drying at low temperature of 150 ℃ and then drying and curing at high temperature of 350-1000 ℃ as required.
The coating is dried at low temperature for 3 minutes and then at high temperature for 1 hour, and the coating is better cured on the optical substrate and is more firmly combined in a high-low temperature drying mode;
the spraying equipment can be spin coating, wiping, spraying, dip coating, printing and the like.
The working principle of the drying box for the anti-dazzle optical substrate provided by the invention is as follows:
firstly, mixing and adjusting a modified silazane polymer solution and dimethylbenzene according to a ratio;
cleaning the surface of a base material to be constructed;
then the modified silazane polymer solution and dimethylbenzene are mixed according to the ratio to adjust the mixed solution, and the mixed solution is sprayed on the surface of the optical base material through spraying equipment;
and drying the sprayed optical base material through a drying box 3 in a manner of drying at low temperature of 150 ℃ and then drying and curing at high temperature of 350-1000 ℃ as required.
Compared with the related art, the drying box for the anti-glare optical substrate provided by the invention has the following beneficial effects:
the application range is diversified, and the anti-dazzle liquid crystal display can be mainly applied to anti-dazzle, anti-fouling and anti-fingerprint treatment of various optical glass panels/cover plates of mobile phones, liquid crystal screens, electronic white boards, integrated education machines, instrument boards for vehicles and ships, monitoring system protection plates, satellite navigation systems, camera lenses, solar photovoltaics and the like, and effective anti-dazzle treatment of surface hardening and light diffusion treatment of organic glass and plastic optical materials.
The coating properties were as follows:
the main components are as follows: a SION;
pencil hardness: greater than or equal to 9H;
gloss (60 ° test): 90-140 (adjustable);
transparency (visible light): greater than 91%;
adhesion (cross-hatch method): grade 0 or above;
rub resistance (1KG weight x rubber x10000 cycles): no defect;
acid resistance (10% hydrochloric acid), about one month;
Modulus：36.2Gpa；
Hardness：2.8Gpa；
binding: greater than 100 cycles (3 Φ PET);
contact Angle: greater than 100;
Accelerated weathering：98％，500hr。
second embodiment
Referring to fig. 6, 7, 8, 9 and 10 in combination, a second embodiment of the present application provides another drying oven for an anti-glare optical substrate based on the drying oven for an anti-glare optical substrate provided in the first embodiment of the present application. The second embodiment is only the preferred mode of the first embodiment, and the implementation of the second embodiment does not affect the implementation of the first embodiment alone.
Specifically, the difference that is used for stoving case of anti-dazzle optical substrate that the second embodiment of this application provided lies in for the stoving case of anti-dazzle optical substrate, first fixed plate 4 and second fixed plate 5 of fixedly connected with between the both sides of stoving 3 inner walls, the first limiting plate 6 of one side fixedly connected with of first fixed plate 4, be provided with on the second fixed plate 5 and compress tightly subassembly 7.
The distance between the first fixing plate 4 and the second fixing plate 5 is greater than that of the base plate 1, the fixing mode of the first fixing plate 4 and the drying box 3 is welding or bonding, the number of the pressing assemblies 7 is multiple, preferably eight, the number can be specifically set according to the size of the drying box 3, and the number of the first limiting plates 6 corresponds to that of the pressing assemblies 7;
the top of the drying box 3 is provided with a box door, and the box door is provided with an air vent.
Compress tightly subassembly 7 includes four slide bars 71, four the one end of slide bar 71 all with one side fixed connection of second fixed plate 5, slide bar 71's surface from inside to outside in proper order the cover be equipped with slurcam 72 and second limiting plate 73, second limiting plate 73 with the relative one side of first limiting plate 6 all bonds and has the slipmat.
The slide rod 71 and the second fixing plate 5 are fixed and fixed by welding or bonding, the slide rod 71 is sleeved with a push plate 72 from inside to outside, the "inside" refers to one side close to the second fixing plate 5, and the push plate 72, the second limit plate 73 and the surface of the slide rod 71 can slide relatively.
An elastic member 75 is fixedly connected between the pushing plate 72 and the second limiting plate 73 and on the surface of the sliding rod 71, and a sliding rail 76 is fixedly connected to one side of the pushing plate 72 close to the second fixing plate 5.
The resilient member 75 is a spring or other resilient element.
Sliding connection has slider 77 on slide rail 76, one side of slider 88 is rotated and is connected with folded plate 78, folded plate 78's last pot head is equipped with movable block 79, the equal fixedly connected with gag lever post 711 in both sides of movable block 79, first spacing groove 710 has been seted up to the upside on folded plate 78 surface.
The rubber pad is bonded on the inner side of the movable block 79, so that the friction between the movable block 79 and the surface of the folded plate 78 can be increased, the movable block 79 cannot move randomly relative to the upper side of the folded plate 78, and the folded plate 78 is divided into an upper side and a lower side relative to the inflection point.
Between the both sides of 3 inner walls of stoving case and being located the below fixedly connected with bottom sprag assembly 8 of first fixed plate 4, bottom sprag assembly 8 includes two strip shaped plate 81.
One side opposite to the two strip-shaped plates 81 is provided with an arc-shaped surface, so that hot air from the lower part can be guided to the two coating surfaces of the optical substrate 1, and the drying of the two surfaces of the optical substrate 1 is facilitated.
A supporting block 82 is fixedly connected between the two strip-shaped plates 81, and an anti-skid block 83 is bonded on the top of the supporting block 82.
The quantity of supporting shoe 82 is provided with four, and equally divide the distribution, and non slipping spur 83, protection pad 11, non slipping spur 83 all can be rubber material or silica gel material.
The aperture of the second limiting groove 10 is the same as the diameter of the limiting rod 711, and the turning part of the folded plate 78 is located at one side of the bottom of the inner surface of the rectangular groove 9 and contacts with the protection pad 11.
And a heating device 12 is arranged on one side of the drying box 3, and a gas transmission assembly 13 is communicated with one side of the heating device 12.
The inside heater that sets up of heating device 12, the heater can be for electric heating wire's mode heating, and can adjust the stability of heating, adds the temperature of the inside air of device 12 shells through the heating, then transmits to stoving case 3 inside through defeated gas subassembly 13 and dries, and the inside temperature sensor that is provided with of heating device 12, and the screen is controlled in the outside setting.
The gas transmission assembly 13 comprises a gas pump 131, the input end of the gas pump 131 is communicated with the instant heating device 12 through a gas inlet pipe 135, the output end of the gas pump 131 is communicated with a connecting pipe 133 through a gas transmission pipe 132, the connecting pipe 133 is arranged at the side of the bottom of the drying box 3, six mounting pipes 134 are uniformly communicated with one side of the connecting pipe 133, the top of each mounting pipe 134 is communicated with a spray head 135, the right end of each spray head 135 is six, and one end of each spray head 135 penetrates through the bottom of the drying box 3 and extends into the drying box 3;
the power supply part in the drying device is powered by an external power supply.
When the two coated surfaces of the substrate 1 are dried, the substrate 1 is held by two hands above two sides of the peripheral side surface and then placed on the bottom support assembly 8, one side of the substrate is in contact with the first limiting plate 6, the substrate is supported by the strip-shaped plate 81, and friction between the substrate 1 and the bottom of the substrate is increased by arranging the anti-slip blocks;
then one hand is prevented from keeping the balance of the top of the substrate 1, the other hand presses the rotary folding plate 78, the folding plate pushes the slide block 77 in the horizontal direction, meanwhile, when the slide block 77 moves upwards, the slide block 77 pushes the push plate 72, the push plate 72 pushes the second limit plate 73 through the elastic piece 75, the second limit plate 73 clamps the substrate 1, and the elastic piece is continuously compressed, when the folding plate 78 rotates to the upper side, the bottom of the upper side is parallel to the bottom of the inner surface of the rectangular groove 9;
at this time, the movable block 79 is pushed to enable the limiting rods 711 at two sides to be inserted into the two second limiting grooves 10, the folding plate 78 is limited, and at this time, the movable block 79 is located in the first limiting groove 710 to limit the movable block 79, so that the limiting is more stable;
at this time, the slide block 77 moves to the middle position of the push plate 72, the middle position of the push plate 72 is limited, so that the limiting is more stable, the compression amount of the elastic member 75 is half of the total length of the elastic member, and the second limiting plate 73 clamps the substrate 1 more stably through the elastic thrust of the elastic member 75;
then, sequentially placing other substrates 1 on the bottom support assembly 8, and then limiting;
then drying the mixture by matching the heating device 12 with the gas transmission assembly 13;
after drying, one hand holds the substrate 1, the other hand lifts the movable block 79 slightly upwards to leave the first limiting groove 710, then moves towards the rear side to drive the limiting rod 711 to move out of the second limiting groove 10, rotates the folding plate 78 upwards, and then can take down the dried substrate 1.
Can fix spacingly through the optical substrate that bottom sprag subassembly 8 cooperation first limiting plate 6 and compress tightly subassembly 7 and treat the stoving, this fixed mode can realize through alone, easy operation is convenient, uses manpower sparingly, and can not make two coated faces leak in the outside completely with the face contact of coating to optical substrate 1 spacing position, guarantees the quality and the speed of drying.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (2)
1. A drying oven for an anti-glare optical substrate, comprising:
an optical substrate;
one or two diffuse reflective coatings, one or two of said diffuse reflective coatings disposed on said optical substrate;
when the optical substrate is coated with the diffuse reflection coating and then dried by a drying box, a first fixing plate and a second fixing plate are fixedly connected between two sides of the inner wall of the drying box, a first limiting plate is fixedly connected to one side of the first fixing plate, and a pressing assembly is arranged on the second fixing plate;
the pressing assembly comprises four sliding rods, one ends of the four sliding rods are fixedly connected with one side of the second fixing plate, a pushing plate and a second limiting plate are sequentially sleeved on the surfaces of the sliding rods from inside to outside, and anti-skid pads are bonded on the opposite sides of the second limiting plate and the first limiting plate;
an elastic piece is fixedly connected between the pushing plate and the second limiting plate and positioned on the surface of the sliding rod, and a sliding rail is fixedly connected to one side, close to the second fixing plate, of the pushing plate;
the sliding rail is connected with a sliding block in a sliding mode, one side of the sliding block is connected with a folding plate in a rotating mode, a movable block is sleeved at the upper end of the folding plate, limiting rods are fixedly connected to two sides of the movable block, and a first limiting groove is formed in the upper side of the surface of the folding plate;
a bottom support assembly is fixedly connected between two sides of the inner wall of the drying box and below the first fixing plate, and comprises two strip-shaped plates;
the top of the second fixing plate is provided with a rectangular groove, the bottom of the inner surface of the rectangular groove is bonded with a protective pad, and one side of the second fixing plate is located on two sides of the rectangular groove and is provided with a second limiting groove.
2. The drying oven for anti-glare optical substrates according to claim 1, wherein a heating device is disposed on one side of the drying oven, and a gas transmission assembly is connected to one side of the heating device.
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| CN201911223402.7A CN110794494B (en) | 2019-12-03 | 2019-12-03 | Drying box for anti-glare optical substrate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911223402.7A CN110794494B (en) | 2019-12-03 | 2019-12-03 | Drying box for anti-glare optical substrate |
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| CN110794494B true CN110794494B (en) | 2021-12-03 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106154365A (en) * | 2015-04-16 | 2016-11-23 | 深圳市光峰光电技术有限公司 | The preparation method of a kind of diffusing reflection layer and Wavelength converter |
| US20180185875A1 (en) * | 2015-08-31 | 2018-07-05 | Asahi Glass Company, Limited | Translucent structure, method for manufacturing same, and article |
| CN108264842A (en) * | 2016-12-30 | 2018-07-10 | 株式会社东进世美肯 | Anti-glare coating composition and anti-glare substrate comprising same |
| CN208671507U (en) * | 2018-06-11 | 2019-03-29 | 丁奇 | A kind of modified plank drying unit for building |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104246540B (en) * | 2012-05-09 | 2016-05-18 | 大日本印刷株式会社 | Blooming, polarizer, liquid crystal panel and image display device |
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2019
- 2019-12-03 CN CN201911223402.7A patent/CN110794494B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106154365A (en) * | 2015-04-16 | 2016-11-23 | 深圳市光峰光电技术有限公司 | The preparation method of a kind of diffusing reflection layer and Wavelength converter |
| US20180185875A1 (en) * | 2015-08-31 | 2018-07-05 | Asahi Glass Company, Limited | Translucent structure, method for manufacturing same, and article |
| CN108264842A (en) * | 2016-12-30 | 2018-07-10 | 株式会社东进世美肯 | Anti-glare coating composition and anti-glare substrate comprising same |
| CN208671507U (en) * | 2018-06-11 | 2019-03-29 | 丁奇 | A kind of modified plank drying unit for building |
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Effective date of registration: 20221103 Address after: First floor, No. 2, Jianshe East Road, Shitan Town, Zengcheng District, Guangzhou, Guangdong 510000 Patentee after: Guangzhou MingEn Machinery Technology Co.,Ltd. Address before: 441000 No. 807, Dongqi street, Laohekou City, Xiangyang City, Hubei Province Patentee before: Du Xiongfei |
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