CN213353603U - Mask sheet making machine - Google Patents
Mask sheet making machine Download PDFInfo
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- CN213353603U CN213353603U CN202022048177.2U CN202022048177U CN213353603U CN 213353603 U CN213353603 U CN 213353603U CN 202022048177 U CN202022048177 U CN 202022048177U CN 213353603 U CN213353603 U CN 213353603U
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- mask
- cloth
- roller
- gauze mask
- compression roller
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Abstract
The utility model relates to the technical field of mask production equipment, in particular to a mask sheet beating machine, which comprises a feeding frame for erecting various cloth materials, a mask forming device for rolling and welding masks, and a mask distributing device for separating and conveying the formed masks to the next station in sequence along the processing sequence of the masks, wherein the feeding frame is provided with a cloth feeding device for unreeling the cloth materials and a cloth adjusting component for adjusting the cloth conveying tension degree; the utility model discloses can be fast, conveniently carry out the independent control to the transport rate of tension of each layer cloth, can guarantee that each layer cloth passes through the hobbing roller with the ultrasonic fusion device with fast, can guarantee the quality of the gauze mask that makes.
Description
The technical field is as follows:
the utility model relates to a gauze mask production facility technical field especially relates to a gauze mask piece-punching machine.
Background art:
the mask is a sanitary article, generally refers to a device worn at the mouth and nose for filtering air entering the mouth and nose to prevent harmful gas, smell and spray from entering and exiting the mouth and nose of a wearer, and is generally made of cloth, and the types of masks include various masks, such as a flat mask, an N95 mask and a KN95 mask.
Gauze mask is in production process, need use multilayer cloth such as melt-blown cloth, non-woven fabrics through gauze mask hobbing roller and ultrasonic fusion joining device's cooperation and roll extrusion and butt fusion shaping, and multilayer cloth is because various factors such as texture difference, mounted position difference, inevitably can cause the too big or undersize of the rate of tension of some of them cloth, and each layer cloth differs through hobbing roller and ultrasonic fusion joining device's speed to influence the normal shaping of gauze mask.
The utility model has the following contents:
the utility model aims at providing a gauze mask flaker to the not enough of prior art existence, can be fast, conveniently carry out the independent control to the transport rate of tension of each layer cloth, can guarantee that each layer cloth passes through the hobbing roller with ultrasonic fusion device with fast, can guarantee the quality of the gauze mask that makes.
In order to realize the purpose, the utility model discloses a technical scheme is: the mask sheet beating machine comprises a feeding frame for arranging various cloth materials, a mask forming device for rolling and welding the mask, and a mask distributing device for separating and conveying the formed mask to the next station in sequence along the processing sequence of the mask, go up the work or material rest and be equipped with the cloth material feeding unit who is used for unreeling the cloth, a cloth adjusting part for adjusting the cloth and carry the rate of tension, cloth material feeding unit includes and rotates a plurality of cloth pay-off pivot subassemblies of connecting on last work or material rest along Y axle direction, a cloth pay-off actuating mechanism for driving cloth pay-off pivot subassembly pivoted, the quantity of cloth adjusting part is the same with the quantity of cloth pay-off pivot subassembly, each cloth adjusting part sets up with corresponding cloth pay-off pivot subassembly is corresponding respectively, the cloth is put on cloth pay-off pivot subassembly, cloth pay-off actuating mechanism's output drive is connected cloth pay-off pivot subassembly.
The cloth adjusting assembly comprises a cloth adjusting and mounting block, a switching sleeve, a first cloth adjusting rod, a second cloth adjusting rod and two rod connecting blocks, wherein the cloth adjusting and mounting block is arranged on the feeding frame; and the cloth unwound by the cloth feeding device is wound between the roller and the second cloth adjusting rod.
The cloth rim charge recovery device comprises a cloth rim charge recovery frame, a cloth rim charge recovery rotating shaft assembly rotationally connected to the cloth rim charge recovery frame, and a cloth rim charge recovery driving mechanism for driving the cloth rim charge recovery rotating shaft assembly to rotate, wherein the cloth rim charge recovery driving mechanism is arranged on the cloth rim charge recovery frame, and the output end of the cloth rim charge recovery driving mechanism is in driving connection with the cloth rim charge recovery rotating shaft assembly; the cloth that cloth material feeding unit unreeled winds in proper order and winds on cloth rim charge recovery pivot subassembly after cloth adjusting part, gauze mask forming device, gauze mask distribute the device.
The mask forming device comprises a mask forming mounting seat, wherein a first mask upper compression roller, a mask hobbing roller, a second mask upper compression roller, a mask hobbing roller and a third mask upper compression roller are sequentially arranged on the mask forming mounting seat along the cloth advancing direction, a first mask lower compression roller is arranged below the first mask upper compression roller, an ultrasonic fusion device is arranged below the mask hobbing roller, a second mask lower compression roller is arranged below the second mask upper compression roller, a mask cutter pillow roller is arranged below the mask hobbing roller, a third mask lower compression roller is arranged below the third mask upper compression roller, a mask feeding channel is formed between the first mask upper compression roller and the first mask lower compression roller, an ultrasonic fusion channel is formed between the mask hobbing roller and the ultrasonic fusion device, a mask guide channel is formed between the second mask upper compression roller and the second mask lower compression roller, and a mask cutting channel is formed between the mask hobbing roller and the mask cutter pillow roller, a mask discharging channel is formed between the third mask upper pressing roller and the third mask lower pressing roller, the first mask upper pressing roller, the first mask lower pressing roller, the mask hobbing roller, the second mask upper pressing roller, the second mask lower pressing roller, the mask hobbing roller, the mask cutter pillow roller, the third mask upper pressing roller and the third mask lower pressing roller are respectively and rotatably connected to a mask forming mounting seat, and the mask forming mounting seat is provided with a mask forming power mechanism for driving the first mask upper pressing roller, the first mask lower pressing roller, the mask hobbing roller, the second mask upper pressing roller, the second mask lower pressing roller, the mask hobbing roller, the mask cutter pillow roller and the third mask upper pressing roller to rotate; the cloth that cloth material feeding unit unreeled loops through gauze mask pan feeding passageway, ultrasonic wave butt fusion passageway, gauze mask guide passageway, gauze mask blank passageway, gauze mask discharging channel.
The further improvement to above-mentioned scheme does, the device is distribute including the gauze mask and send the frame to the gauze mask, be equipped with on the gauze mask send the frame be used for carrying the gauze mask after the separation to the gauze mask conveying mechanism of next station, a cut-off piece for following the cloth with the gauze mask and separating the compression roller, gauze mask conveying mechanism includes gauze mask transport drive roll, gauze mask transport driven roller, the conveyer belt, gauze mask transport power unit, the gauze mask transport drive roll, gauze mask transport driven roller rotates respectively to be connected on the frame is sent to the gauze mask, the conveyer belt is around locating on gauze mask transport drive roll and the gauze mask transport driven roller, gauze mask transport power unit's output drive connection gauze mask transport drive roll.
The utility model has the advantages that: the utility model provides a mask making machine, which comprises a feeding frame for arranging various cloth materials, a mask forming device for rolling and welding the mask, and a mask distributing device for separating and conveying the formed mask to the next station in sequence along the processing sequence of the mask, the cloth feeding device comprises a plurality of cloth feeding rotating shaft assemblies which are rotationally connected to the feeding frame along the Y-axis direction, and a cloth feeding driving mechanism for driving the cloth feeding rotating shaft assemblies to rotate, the number of the cloth adjusting assemblies is the same as that of the cloth feeding rotating shaft assemblies, each cloth adjusting assembly is correspondingly arranged with the corresponding cloth feeding rotating shaft assembly, cloth is sleeved on the cloth feeding rotating shaft assemblies, and the output end of the cloth feeding driving mechanism is in driving connection with the cloth feeding rotating shaft assemblies; the utility model has the advantages of it is following:
1. the utility model discloses be equipped with the cloth adjusting part that is used for adjusting cloth conveying tightness respectively in each cloth pay-off pivot subassembly's corresponding position department, can be fast, conveniently carry out the independent control to corresponding cloth conveying tightness through each cloth adjusting part, can guarantee that each layer cloth passes through the hobbing roller and ultrasonic wave butt fusion device with fast to can guarantee the quality of the gauze mask that makes;
2. the first cloth adjusting rod sleeve of the utility model is provided with the roller, the cloth unreeled by the cloth feeding device winds between the roller and the second cloth adjusting rod, and the cloth can pass through more smoothly, thereby facilitating the transportation of the subsequent cloth;
3. the utility model discloses be equipped with cloth rim charge recovery unit, the pivot subassembly is retrieved to cloth rim charge through cloth rim charge recovery unit can be fast, steadily carry out the rolling with the cloth rim charge, neither can make cloth rim charge distribute in a jumble in the workshop, can carry out recycle to the cloth rim charge moreover, and the practicality is strong.
Description of the drawings:
fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural view of the mask forming device of the present invention.
Fig. 3 is a schematic structural view of the mask dispensing device of the present invention.
Fig. 4 is a schematic structural diagram of the cloth adjusting assembly of the present invention.
Fig. 5 is a schematic structural view of the cloth scrap recycling device of the present invention.
Description of reference numerals: a material loading frame 1, a mask forming device 3, a mask forming mounting seat 31, a first mask upper press roller 32, a first mask lower press roller 33, a mask hobbing roller 34, a second mask upper press roller 35, a second mask lower press roller 36, a mask hobbing roller 37, a mask pillow roller 38, a third mask upper press roller 39, a third mask lower press roller 40, a mask forming power mechanism 401, a mask distribution device 4, a mask distribution frame 41, a mask conveying mechanism 42, a mask conveying drive roller 421, a mask conveying driven roller 422, a conveying belt 423, a mask conveying power mechanism 424, a dividing sheet 43, a distribution press roller 44, a cloth feeding device 5, a cloth feeding rotating shaft component 51, a cloth feeding drive mechanism 52, a cloth adjusting component 6, a cloth adjusting mounting block 61, a switching sleeve 62, a first cloth adjusting rod 63, a second cloth adjusting rod 64, a rod connecting block 65, a roller 66, a cloth rim material recovery device 8, A cloth scrap recovery frame 81, a cloth scrap recovery rotating shaft assembly 82, a cloth scrap recovery driving mechanism 83 and an ultrasonic welding device 9.
The specific implementation mode is as follows:
the present invention will be further described with reference to the accompanying drawings, as shown in fig. 1-5, the present invention sequentially comprises a material loading frame 1 for mounting various kinds of cloth, a mask forming device 3 for rolling and welding the mask, and a mask distributing device 4 for separating and conveying the formed mask to the next station along the mask processing sequence, wherein the material loading frame 1 is provided with a cloth feeding device 5 for unwinding the cloth and a cloth adjusting assembly 6 for adjusting the tension of cloth feeding, the cloth feeding device 5 comprises a plurality of cloth feeding rotating shaft assemblies 51 rotatably connected to the material loading frame 1 along the Y-axis direction, and a cloth feeding driving mechanism 52 for driving the cloth feeding rotating shaft assemblies 51 to rotate, the number of the cloth feeding rotating shaft assemblies 51 in the present embodiment is four, and the number of the cloth adjusting assemblies 6 is the same as the number of the cloth feeding rotating shaft assemblies 51, each cloth adjusting assembly 6 is arranged corresponding to the corresponding cloth feeding rotating shaft assembly 51, the cloth is sleeved on the cloth feeding rotating shaft assembly 51, and the output end of the cloth feeding driving mechanism 52 is in driving connection with the cloth feeding rotating shaft assembly 51; the utility model discloses be equipped with the cloth adjusting part 6 that is used for adjusting the cloth and carries the elasticity respectively in each cloth pay-off pivot subassembly 51's corresponding position punishment, the angle of adjusting pole 63 can be adjusted the cloth transport tension through adjusting the cloth and adjusting position of installation piece 61 on last work or material rest 1 and the relative first cloth of second cloth adjusting pole 64, can be quick through each cloth adjusting part 6, conveniently carry the tension to corresponding cloth and adjust alone, can guarantee that each layer cloth passes through the hobbing roller and ultrasonic fusion device 9 with fast, thereby can guarantee the quality of the gauze mask that makes.
The cloth adjusting assembly 6 comprises a cloth adjusting and mounting block 61, a switching sleeve 62, a first cloth adjusting rod 63, a second cloth adjusting rod 64 and two rod connecting blocks 65, the cloth adjusting and mounting block 61 is arranged on the feeding frame 1, the first cloth adjusting rod 63 is inserted on the cloth adjusting and mounting block 61 along the Y-axis direction through the switching sleeve 62, the second cloth adjusting rod 64 is arranged side by side with the first cloth adjusting rod 63 through the two rod connecting blocks 65, the first cloth adjusting rod 63 is sleeved with a roller 66, cloth can pass through the first cloth adjusting rod smoothly, and subsequent cloth can be conveyed conveniently; the cloth unwound by the cloth feeding device 5 is wound between the roller 66 and the second cloth adjusting rod 64.
The utility model also comprises a cloth rim charge recovery device 8, wherein the cloth rim charge recovery device 8 comprises a cloth rim charge recovery frame 81, a cloth rim charge recovery rotating shaft component 82 rotationally connected to the cloth rim charge recovery frame 81, and a cloth rim charge recovery driving mechanism 83 for driving the cloth rim charge recovery rotating shaft component 82 to rotate, the cloth rim charge recovery driving mechanism 83 is arranged on the cloth rim charge recovery frame 81, and the output end of the cloth rim charge recovery driving mechanism 83 is in driving connection with the cloth rim charge recovery rotating shaft component 82; the cloth unwound by the cloth feeding device 5 is sequentially wound on the cloth scrap recovery rotating shaft assembly 82 after passing through the cloth adjusting assembly 6, the mask forming device 3 and the mask distributing device 4; through the cloth rim charge recovery pivot subassembly 82 of cloth rim charge recovery unit 8 can be fast, steadily carry out the rolling with the cloth rim charge, neither can make the cloth rim charge distribute in the workshop in a jumble, can carry out recycle to the cloth rim charge moreover, the practicality is strong.
The mask forming device 3 comprises a mask forming mounting seat 31, the mask forming mounting seat 31 is sequentially provided with a first mask upper pressure roller 32, a mask hobbing roller 34, a second mask upper pressure roller 35, a mask hobbing roller 37 and a third mask upper pressure roller 39 along the cloth advancing direction, a first mask lower pressure roller 33 is arranged below the first mask upper pressure roller 32, an ultrasonic fusion device 9 is arranged below the mask hobbing roller 34, a second mask lower pressure roller 36 is arranged below the second mask upper pressure roller 35, a mask cutter pillow roller 38 is arranged below the mask hobbing roller 37, a third mask lower pressure roller 40 is arranged below the third mask upper pressure roller 39, a mask feeding channel is formed between the first mask upper pressure roller 32 and the first mask lower pressure roller 33, an ultrasonic fusion channel is formed between the mask hobbing roller 34 and the ultrasonic fusion device 9, a mask guide channel is formed between the second mask upper pressure roller 35 and the second mask lower pressure roller 36, a mask blank channel is formed between the mask hobbing roller 37 and the mask pillow roller 38, a mask discharge channel is formed between the third mask upper compression roller 39 and the third mask lower compression roller 40, the first mask upper compression roller 32, the first mask lower compression roller 33, the mask hobbing roller 34, the second mask upper compression roller 35, the second mask lower compression roller 36, the mask hobbing roller 37, the mask pillow roller 38, the third mask upper compression roller 39 and the third mask lower compression roller 40 are respectively and rotatably connected to the mask forming mounting seat 31, and the mask forming mounting seat 31 is provided with a mask forming power mechanism 401 for driving the first mask upper compression roller 32, the first mask lower compression roller 33, the mask hobbing roller 34, the second mask upper compression roller 35, the second mask lower compression roller 36, the mask hobbing roller 37, the mask pillow roller 38 and the third mask upper compression roller 39 to rotate; the cloth that cloth material feeding unit 5 unreeled loops through gauze mask pan feeding passageway, ultrasonic wave butt fusion passageway, gauze mask guide passageway, gauze mask blank passageway, gauze mask discharging channel.
The mask distributing device 4 comprises a mask distributing frame 41, a mask conveying mechanism 42 for conveying the separated mask to the next station is arranged on the mask distributing frame 41, a separating piece 43 for separating the mask from cloth, a distributing compression roller 44 for flattening the separated mask, and a nose bridge strip pasting is performed on the mask in the later stage, the mask conveying mechanism 42 comprises a mask conveying driving roller 421, a mask conveying driven roller 422, a conveying belt 423 and a mask conveying power mechanism 424, the mask conveying driving roller 421 and the mask conveying driven roller 422 are respectively connected to the mask distributing frame 41 in a rotating mode, the conveying belt 423 winds the mask conveying driving roller 421 and the mask conveying driven roller 422, and the output end of the mask conveying power mechanism 424 is connected with the mask conveying driving roller 421 in a driving mode.
The working principle is as follows:
each layer of cloth required by the mask is respectively sleeved on the four cloth feeding rotating shaft assemblies 51; the cloth feeding driving mechanism 52 drives each cloth feeding rotating shaft assembly 51 to rotate and unreel the cloth; the unreeled cloth is wound between the roller 66 and the second cloth adjusting rod 64, then sequentially wound through the mask forming device 3 and the mask distributing device 4, and finally wound on the cloth rim charge recycling rotating shaft assembly 82, and the conveying tension of each cloth is respectively and independently adjusted through each cloth adjusting assembly 6; the mask hobbing roller 34 of the mask forming device 3 and the ultrasonic welding device 9 roll and weld the cloth of each layer, and the mask hobbing roller 37 cuts the mask from the cloth strip; the utility model discloses a tensioning degree is carried to corresponding cloth fast, conveniently to each cloth adjusting part 6 and is adjusted alone, can guarantee that each layer cloth passes through the hobbing roller with fast and ultrasonic wave butt fusion device 9 to can guarantee the quality of the gauze mask that makes.
Of course, the above description is only the preferred embodiment of the present invention, so all the equivalent changes or modifications made by the structure, features and principles in accordance with the claims of the present invention are included in the claims of the present invention.
Claims (5)
1. Gauze mask mascerating machine, its characterized in that: the mask processing sequence sequentially comprises a feeding frame (1) for erecting various cloth materials, a mask forming device (3) for rolling and welding the masks, and a mask distributing device (4) for separating and conveying the formed masks to a next station, wherein a cloth feeding device (5) for unreeling the cloth materials and a cloth adjusting assembly (6) for adjusting the cloth conveying tension degree are arranged on the feeding frame (1), the cloth feeding device (5) comprises a plurality of cloth feeding rotating shaft assemblies (51) which are rotationally connected to the feeding frame (1) along the Y-axis direction, and a cloth feeding driving mechanism (52) for driving the cloth feeding rotating shaft assemblies (51) to rotate, the number of the cloth adjusting assemblies (6) is the same as that of the cloth feeding rotating shaft assemblies (51), and each cloth adjusting assembly (6) is respectively arranged corresponding to the corresponding cloth feeding rotating shaft assembly (51), the cloth is sleeved on the cloth feeding rotating shaft component (51), and the output end of the cloth feeding driving mechanism (52) is connected with the cloth feeding rotating shaft component (51) in a driving mode.
2. The mask making machine according to claim 1, wherein: the cloth adjusting assembly (6) comprises a cloth adjusting and mounting block (61), a switching sleeve (62), a first cloth adjusting rod (63), a second cloth adjusting rod (64) and two rod connecting blocks (65), the cloth adjusting and mounting block (61) is arranged on the upper material rack (1), the first cloth adjusting rod (63) is inserted on the cloth adjusting and mounting block (61) along the Y-axis direction through the switching sleeve (62), the second cloth adjusting rod (64) is arranged side by side with the first cloth adjusting rod (63) through the two rod connecting blocks (65), and the first cloth adjusting rod (63) is sleeved with a roller (66); the cloth unreeled by the cloth feeding device (5) winds between the roller (66) and the second cloth adjusting rod (64).
3. The mask making machine according to claim 1, wherein: the cloth scrap recovery device (8) comprises a cloth scrap recovery frame (81), a cloth scrap recovery rotating shaft assembly (82) rotationally connected to the cloth scrap recovery frame (81), and a cloth scrap recovery driving mechanism (83) used for driving the cloth scrap recovery rotating shaft assembly (82) to rotate, wherein the cloth scrap recovery driving mechanism (83) is arranged on the cloth scrap recovery frame (81), and the output end of the cloth scrap recovery driving mechanism (83) is in driving connection with the cloth scrap recovery rotating shaft assembly (82); the cloth unreeled by the cloth feeding device (5) is sequentially wound on the cloth scrap recovery rotating shaft assembly (82) after passing through the cloth adjusting assembly (6), the mask forming device (3) and the mask distributing device (4).
4. The mask making machine according to claim 1, wherein: the mask forming device (3) comprises a mask forming mounting seat (31), the mask forming mounting seat (31) is sequentially provided with a first mask upper compression roller (32), a mask hobbing roller (34), a second mask upper compression roller (35), a mask hobbing roller (37) and a third mask upper compression roller (39) along the cloth advancing direction, a first mask lower compression roller (33) is arranged below the first mask upper compression roller (32), an ultrasonic fusion welding device (9) is arranged below the mask hobbing roller (34), a second mask lower compression roller (36) is arranged below the second mask upper compression roller (35), a mask cutter pillow roller (38) is arranged below the mask hobbing roller (37), a third mask lower compression roller (40) is arranged below the third mask upper compression roller (39), a mask feeding channel is formed between the first mask upper compression roller (32) and the first mask lower compression roller (33), and an ultrasonic fusion welding channel is formed between the mask hobbing roller (34) and the ultrasonic fusion welding device (9), form gauze mask guide passageway between compression roller (35) and second gauze mask lower pressure roller (36) on the second gauze mask, form gauze mask blank passageway between gauze mask hobbing cutter roller (37) and gauze mask pillow roller (38), form gauze mask discharge channel between compression roller (39) and third gauze mask lower pressure roller (40) on the third gauze mask, compression roller (32) on the first gauze mask, compression roller (33) under the first gauze mask, gauze mask hobbing roller (34), compression roller (35) on the second gauze mask, compression roller (36) under the second gauze mask, gauze mask hobbing cutter roller (37), gauze mask sword pillow roller (38), compression roller (39) on the third gauze mask, compression roller (40) rotate respectively and connect on gauze mask shaping mount pad (31) under the third gauze mask, gauze mask shaping mount pad (31) are equipped with and are used for driving compression roller (32) on the first gauze mask, compression roller (33) under the first gauze mask hobbing roller (34), compression roller (35) on the second gauze mask, A mask forming power mechanism (401) which rotates by a second mask lower compression roller (36), a mask hobbing cutter roller (37), a mask pillow roller (38) and a third mask upper compression roller (39); the cloth that cloth material feeding unit (5) unreeled loops through gauze mask pan feeding passageway, ultrasonic wave butt fusion passageway, gauze mask guide passageway, gauze mask blank passageway, gauze mask discharging channel.
5. The mask making machine according to claim 1, wherein: device (4) is distribute including the gauze mask and puts up (41) including the gauze mask, be equipped with on the gauze mask distributes frame (41) and be used for carrying the gauze mask after the separation to gauze mask conveying mechanism (42) of next station, be used for separating gauze mask from the cloth division piece (43), be used for distributing compression roller (44) with the gauze mask that separates flattens, gauze mask conveying mechanism (42) are including gauze mask transport drive roller (421), gauze mask transport driven roller (422), conveyer belt (423), gauze mask transport power unit (424), gauze mask transport drive roller (421), gauze mask transport driven roller (422) rotate respectively and connect in gauze mask distribute frame (41), conveyer belt (423) are around locating on gauze mask transport drive roller (421) and gauze mask transport driven roller (422), gauze mask transport power unit's (424) output drive connection gauze mask transport drive roller (421).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022048177.2U CN213353603U (en) | 2020-09-17 | 2020-09-17 | Mask sheet making machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022048177.2U CN213353603U (en) | 2020-09-17 | 2020-09-17 | Mask sheet making machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213353603U true CN213353603U (en) | 2021-06-04 |
Family
ID=76153589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022048177.2U Active CN213353603U (en) | 2020-09-17 | 2020-09-17 | Mask sheet making machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213353603U (en) |
-
2020
- 2020-09-17 CN CN202022048177.2U patent/CN213353603U/en active Active
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