CN118857604B - A detection device and detection method for production of degradable paperboard - Google Patents
A detection device and detection method for production of degradable paperboard Download PDFInfo
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- CN118857604B CN118857604B CN202411297680.8A CN202411297680A CN118857604B CN 118857604 B CN118857604 B CN 118857604B CN 202411297680 A CN202411297680 A CN 202411297680A CN 118857604 B CN118857604 B CN 118857604B
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- 239000011087 paperboard Substances 0.000 title claims abstract description 74
- 238000001514 detection method Methods 0.000 title claims abstract description 53
- 238000004519 manufacturing process Methods 0.000 title claims description 18
- 239000011111 cardboard Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims description 7
- 238000007664 blowing Methods 0.000 claims description 4
- 230000003213 activating effect Effects 0.000 claims 2
- 239000011229 interlayer Substances 0.000 abstract description 16
- 239000010410 layer Substances 0.000 abstract description 8
- 239000000123 paper Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 7
- 241000252254 Catostomidae Species 0.000 description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 3
- 235000017491 Bambusa tulda Nutrition 0.000 description 3
- 241001330002 Bambuseae Species 0.000 description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 3
- 239000011425 bamboo Substances 0.000 description 3
- 230000000740 bleeding effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/30—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces
- G01B11/303—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces using photoelectric detection means
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Making Paper Articles (AREA)
Abstract
The invention provides a detection device and a detection method for producing degradable paperboards, which relate to the technical field of corrugated board detection and comprise a machine case, wherein the surface of the machine case is provided with a detection mechanism, a distance measuring mechanism and a positioning mechanism, the detection mechanism comprises a sliding frame, the surface of the sliding frame is provided with a plurality of positioning cylinders, through the arrangement of the detection mechanism, air flow in a connecting pipe enters a nozzle from a through hole and is inflated into a plurality of interlayers in corrugated paper, detect the gas tightness of a plurality of intermediate layers inside corrugated paper according to air pressure sensor, can drive the carriage through the second cylinder that sets up and remove, push the nozzle into the cardboard intermediate layer in, can drive the mounting bracket through first cylinder and remove to drive the locating lever and remove to the inside intermediate layer center department of cardboard, make the air pressure sensor that the locating lever tip set up can detect the atmospheric pressure of different positions in the cardboard intermediate layer, improved the detection effect.
Description
Technical Field
The invention relates to the technical field of corrugated board detection, in particular to a detection device and a detection method for degradable board production.
Background
The degradable paperboard is an environment-friendly paperboard, also called as biodegradable paperboard, in the actual production and use process, corrugated paperboard is usually used, and the produced paperboard is often uneven in interior and even broken in part of positions due to the relation between humidity, temperature, adhesive thickness, tension, relative humidity and paperboard quality in a corrugated paperboard production line, so that the product is required to be detected in the production process.
When the quality of corrugated paper board is detected, the prior detection device judges the integrity of the corrugated paper by observing the surface of the corrugated paper, but a plurality of layers of interlayers are arranged in the corrugated paper, the inside is damaged, and when the external cracks are smaller, the detection cannot be easily detected from the surface, in the prior art, the gas is introduced into the paper board, the air tightness is detected, and a sealing plate is arranged outside, however, since the cardboard has certain softness, the sealing plate cannot be well attached to the edge of the cardboard, injected air flows are easy to overflow, the detection result is affected, meanwhile, when air is injected into an interlayer in the cardboard, the cardboard is impacted by the air flows, the cardboard is offset, and the detection result is affected when the flatness of the cardboard is detected, therefore, the detection device and the detection method for producing the degradable cardboard are provided.
Disclosure of Invention
The invention aims to solve the problems and provides a detection device and a detection method for producing degradable paperboards.
In order to achieve the purpose, the detection device for producing the degradable paperboard comprises a machine case, wherein the surface of the machine case is provided with a detection mechanism, a distance measuring mechanism and a positioning mechanism, the detection mechanism comprises a sliding frame, the surface of the sliding frame is provided with a plurality of positioning cylinders, the surface of the positioning cylinders is provided with a nozzle, the inside of the positioning cylinders is provided with a positioning rod, the surface of the positioning cylinders is provided with a connecting pipe in a communicating manner, the surface of the positioning cylinders is connected with a rotating cylinder in a rotating manner through a bearing, the surface of the rotating cylinder is provided with a plurality of rotating blades, the surface of the positioning cylinders is provided with through holes for communicating with the nozzle, the surface of the positioning rod is provided with an air pressure sensor, the surface of the nozzle is provided with a connecting cylinder, the surface of the connecting cylinder is provided with a connecting frame, the surface of the connecting frame is provided with an air bag, and the surface of the connecting cylinder is provided with a plurality of air inlets.
Preferably, the range finding mechanism includes the mounting bracket, and is a plurality of the locating lever passes through the bearing and rotates with the mounting bracket to be connected, and is a plurality of the surface of rotating the section of thick bamboo all is provided with first tooth, and is a plurality of the surface of locating lever all is provided with the second tooth, and is a plurality of first tooth is connected with the meshing of second tooth, and is a plurality of the surface of locating lever all is provided with infrared detector, and the mounting bracket of setting can drive the locating lever and remove when removing, and the first tooth of setting is meshed with the second tooth all the time for rotating the section of thick bamboo and can drive the second tooth and rotate when rotating, thereby drive the locating lever and rotate, pivoted locating lever drives infrared detector and rotates, is convenient for range finding to inside, thereby can detect the roughness of inside.
Preferably, the nozzle is mounted on a carriage, the connecting frame is mounted on the surface of the carriage, and the carriage is arranged to support the nozzle.
Preferably, the surface of machine case is provided with the workstation, the surface mounting of workstation has first cylinder and second cylinder, the output and the mounting bracket fixed connection of first cylinder, the output and the carriage fixed connection of second cylinder, the first cylinder of setting can drive the mounting bracket and remove, and the second cylinder of setting can drive the carriage and support.
Preferably, the positioning mechanism comprises a supporting frame, the surface of supporting frame is provided with a plurality of stay tubes, and is a plurality of the surface of stay tube all is provided with the sucking disc, the lower surface intercommunication of supporting frame is provided with the exhaust tube, the lower surface of workstation is provided with the air pump, the inlet end and the exhaust tube intercommunication of air pump set up, set up the air pump, when bleeding again, the cardboard can adsorb in the top of sucking disc.
Preferably, a plurality of surface intercommunication of connecting pipe is provided with the shunt tubes, the surface intercommunication of shunt tubes is provided with the air supply hose, and the shunt tubes of setting can shunt the air current, is convenient for carry out gaseous transport to a plurality of intermediate layers.
Preferably, the surface communication of air supply hose is provided with the intake pipe, the intake pipe sets up with the end intercommunication of giving vent to anger of air pump, and the intake pipe of setting can transport the gas of air pump.
Preferably, the surface of workstation is provided with the backup pad, air feed hose and intake pipe are installed in the backup pad, and the backup pad of setting can support air feed hose and intake pipe.
Preferably, a plurality of shunt tubes are installed on the sliding frame, the rotating blades are movably connected with the positioning cylinder, and the rotating blades are contacted with the positioning cylinder, so that air leakage can be effectively reduced.
The detection method for producing the degradable paperboard comprises the following steps of:
s1, placing the paperboard above a plurality of suckers.
S2, starting first air cylinders on two sides of the paper board to drive the sliding frame to move towards the paper board, propping against the paper board, starting the air pump to adsorb the paper board on the sucker, blowing air into the paper board, checking air tightness, and judging whether the paper board is damaged according to the detected value of the air pressure sensor.
And S3, in the process of S2 blowing, starting the second air cylinders on two sides of the paperboard to drive the mounting frame to move towards the position of the paperboard, and measuring the distance inside the paperboard by using the infrared detector on the positioning rod to judge the flatness inside the paperboard.
Compared with the prior art, the invention has the advantages and positive effects that,
1. The invention provides a detection device and a detection method for producing degradable paperboards, wherein the detection mechanism is arranged, air flow is pumped into an air inlet pipe through an air pump, the air flow in the air inlet pipe enters an air supply hose, the air flow in the air supply hose enters a shunt pipe, the air flow in the shunt pipe enters a connecting pipe, the air flow in the connecting pipe enters a nozzle from a through hole and is inflated into a plurality of interlayers in corrugated paper, the air tightness of the interlayers in the corrugated paper is detected according to an air pressure sensor, a sliding frame can be driven to move through a second air cylinder, the nozzle is pushed into the interlayer of the paperboards, a first air cylinder can drive a mounting frame to move, so that a positioning rod is driven to move towards the center of the interlayer in the paperboards, the air pressure sensor arranged at the end part of the positioning rod can detect the air pressures at different positions in the interlayer of the paperboards, and the detection effect is improved.
2. The invention provides a detection device and a detection method for producing degradable paperboards, when air flows are injected into a paperboard interlayer from a nozzle, the air can enter a connecting frame from an air inlet and enter an air bag, the air bag expands and bulges, and can be attached to the edge of the paperboard interlayer at the moment, so that the air flows are effectively prevented from overflowing, the interlayer in the paperboard is completely sealed, and the accuracy of an air pressure sensor in detection is improved.
3. The invention provides a detection device and a detection method for producing degradable paperboards, wherein in the process of detecting the air tightness of the inside of a paperboard, a first air cylinder can drive a mounting frame to move, a positioning rod enters the inside of a paperboard interlayer, and a laser detector at the end part of the positioning rod can be driven to enter the inside of the interlayer, so that the flatness of different positions in the interlayer can be detected by continuously moving the laser detector, and the detection range is increased.
4. The invention provides a detection device and a detection method for producing degradable paperboards, when the inside of the paperboards is filled with air, the air is pumped into an air inlet pipe through an air pump, the air enters a positioning cylinder from a connecting pipe, at the moment, the air vertically enters, a rotary blade can be pushed to rotate, so that the rotating cylinder is driven to rotate, a positioning rod can be driven to rotate through the mutual matching of a first tooth and a second tooth, a laser detector can rotate, and meanwhile, the laser detector moves in an interlayer, so that the complete detection of the flatness of the interlayer can be realized, and meanwhile, an air pressure sensor at the end part of the positioning rod rotates, so that the accuracy of air pressure detection can be improved.
5. According to the detection device and the detection method for the degradable paperboard production, when the air pump pumps air to perform air tightness detection, the air pump pumps air flow into the air inlet pipe, and the air flow near the sucker is pumped, so that negative pressure is formed in the sucker, the paperboard can be stably adsorbed on the sucker, the condition that the paperboard is deviated when the paperboard is impacted by the air flow is avoided, the influence on the detection of internal flatness is reduced, and the detection precision is improved.
Drawings
Fig. 1 is a schematic perspective view of a detecting device and a detecting method for producing degradable paperboards according to the present invention;
fig. 2 is a schematic diagram of the internal structure of a chassis of the detection device and the detection method for producing degradable paperboards according to the present invention;
FIG. 3 is a schematic view of a partial bottom view of a workbench of the detecting device and the detecting method for producing degradable paperboards;
fig. 4 is a schematic diagram of a partial top view structure of a supporting frame of a detecting device and a detecting method for producing a degradable paperboard according to the present invention;
FIG. 5 is a schematic diagram showing a partial side view of a mounting frame of a detecting device and a detecting method for producing degradable paperboards according to the present invention;
FIG. 6 is a schematic diagram showing a part of a structure of a connecting frame of a detecting device and a detecting method for producing degradable paperboards;
fig. 7 is a schematic diagram showing a partial structure of a shunt tube of a detecting device and a detecting method for producing degradable paperboards according to the present invention;
FIG. 8 is a schematic view of a partial enlarged structure at A in FIG. 7;
Fig. 9 is a schematic diagram of a partial structure of an air pressure sensor of the detecting device and the detecting method for producing degradable paperboards.
The illustration is 1, a case, 2, a detection mechanism, 201, a sliding frame, 202, a positioning cylinder, 203, a nozzle, 204, a positioning rod, 205, a connecting pipe, 206, a rotating cylinder, 207, a rotating blade, 208, an air pressure sensor, 209, a connecting cylinder, 210, a connecting frame, 211, an air bag, 3, a distance measuring mechanism, 301, a mounting frame, 302, a first tooth, 303, a second tooth, 304, an infrared detector, 4, a positioning mechanism, 401, a supporting pipe, 402, a sucker, 403, an exhaust pipe, 404, an air pump, 405, a supporting frame, 8, a workbench, 9, a first air cylinder, 10, a second air cylinder, 11, a shunt pipe, 12, an air supply hose, 13, an air inlet pipe, 14 and a supporting plate.
Detailed Description
In order that the above objects, features and advantages of the application will be more clearly understood, a further description of the application will be rendered by reference to the appended drawings and examples. It should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced otherwise than as described herein, and therefore the present invention is not limited to the specific embodiments of the disclosure that follow.
Embodiment 1, as shown in fig. 1-9, a detecting device for producing degradable paperboards, including a chassis 1, the surface of the chassis 1 is provided with a detecting mechanism 2, a ranging mechanism 3 and a positioning mechanism 4, the detecting mechanism 2 includes a sliding frame 201, the surface of the sliding frame 201 is provided with a plurality of positioning cylinders 202, the surface of the plurality of positioning cylinders 202 is provided with a nozzle 203, the inside of the plurality of positioning cylinders 202 is provided with a positioning rod 204, the surface of the plurality of positioning cylinders 202 is provided with a connecting pipe 205 in a communicating manner, the surface of the plurality of positioning cylinders 202 is connected with a rotating cylinder 206 in a rotating manner through bearings, the surface of the plurality of rotating cylinder 206 is provided with a plurality of rotating blades 207, the surface of the plurality of positioning cylinders 202 is provided with a through hole for communicating with the nozzle 203, the surface of the plurality of positioning rods 204 is provided with a pneumatic sensor 208, the surface of the plurality of nozzles 203 is provided with a plurality of connecting cylinders 209, the surface of the plurality of connecting cylinders 209 is provided with a connecting frame 210, the surface of the connecting frame 210 is provided with an air bag 211, and the surface of the plurality of connecting cylinders 209 is provided with a plurality of air inlets.
The effect that its whole embodiment 1 reaches is, carriage 201 drives the link 210 removal of surface, link 210 drives the gasbag 211 of surface and supports the outer wall of cardboard, can avoid effectively when carrying out the gas injection to the inside intermediate layer of cardboard, the condition that the air current overflows, let in the air current of perpendicular entering in the connecting pipe 205, can blow inside rotating vane 207 and rotate, when the air current moves to the through-hole department of seting up on the positioning tube 202, the air current gets into the inside of nozzle 203, and the blowout air current, can detect the atmospheric pressure of inside through air pressure sensor 208 this moment, when the atmospheric pressure increases gradually, indicate that the cardboard does not take place the broken hole, when inside pressure keeps stable level, indicate that the cardboard is inside to have the damage, can find out the intermediate layer of corresponding emergence damage this moment.
1-9, The ranging mechanism 3 comprises a mounting frame 301, a plurality of positioning rods 204 are rotatably connected with the mounting frame 301 through bearings, first teeth 302 are arranged on the surfaces of a plurality of rotating cylinders 206, second teeth 303 are arranged on the surfaces of a plurality of positioning rods 204, the first teeth 302 are meshed with the second teeth 303, infrared detectors 304 are arranged on the surfaces of a plurality of positioning rods 204, nozzles 203 are mounted on a sliding frame 201, connecting frames 210 are mounted on the surfaces of the sliding frame 201, a workbench 8 is arranged on the surfaces of a machine case 1, first air cylinders 9 and second air cylinders 10 are mounted on the surfaces of the workbench 8, the output ends of the first air cylinders 9 are fixedly connected with the mounting frame 301, and the output ends of the second air cylinders 10 are fixedly connected with the sliding frame 201.
The effect that its whole embodiment 2 reaches is, the mounting bracket 301 of setting can drive the locating lever 204 and remove when removing, the first tooth 302 of setting is in mesh with the second tooth 303 all the time, make the section of thick bamboo 206 can drive the second tooth 303 when rotating and rotate, thereby drive the locating lever 204 and rotate, the pivoted locating lever 204 drives infrared detector 304 and rotates, be convenient for range finding to inside, thereby can detect the roughness of inside, the carriage 201 of setting can support nozzle 203, the first cylinder 9 of setting can drive the mounting bracket 301 and remove, the second cylinder 10 of setting can drive the carriage 201 and remove.
1-9, The positioning mechanism 4 comprises a support frame 405, a plurality of support pipes 401 are arranged on the surface of the support frame 405, suction cups 402 are arranged on the surfaces of the plurality of support pipes 401, an exhaust pipe 403 is arranged on the lower surface of the support frame 405 in a communicating manner, an air pump 404 is arranged on the lower surface of the workbench 8, an air inlet end of the air pump 404 is arranged in a communicating manner with the exhaust pipe 403, a shunt pipe 11 is arranged on the surface of the plurality of connecting pipes 205 in a communicating manner, an air supply hose 12 is arranged on the surface of the shunt pipe 11 in a communicating manner, an air inlet pipe 13 is arranged in the surface of the air supply hose 12 in a communicating manner, an air outlet end of the air pump 404 in a communicating manner is arranged on the air inlet pipe 13, a support plate 14 is arranged on the surface of the workbench 8, the air supply hose 12 and the air inlet pipe 13 are arranged on the support plate 14, the plurality of shunt pipes 11 are arranged on the sliding frame 201, and the rotating blades 207 are movably connected with the positioning cylinder 202.
The effect that its whole embodiment 3 reached is, sets up air pump 404, and when bleeding again, the cardboard can adsorb in the top of sucking disc 402, and shunt tubes 11 that set up can shunt the air current, and the transportation of gas is carried out to a plurality of intermediate layers to being convenient for, and intake pipe 13 that set up can transport the gas that air pump 404 pumped, and backup pad 14 that set up can support air supply hose 12 and intake pipe 13, sets up rotary vane 207 and positioning tube 202 contact, can effectively reduce the gas leakage.
In the working principle, a paperboard is placed above a plurality of suckers 402, the first air cylinder 9 drives the end part of the positioning rod 204 to enter the paperboard through the mounting frame 301, so that the infrared detector 304 is in the paperboard, the second air cylinder 10 drives the sliding frame 201 to move, the sliding frame 201 drives the connecting frame 210 on the surface to move, the connecting frame 210 drives the air bag 211 on the surface to prop against the outer wall of the paperboard, at the moment, the air flow is pumped through the air pump 404, so that the air flow at the position of the suckers 402 can enter the supporting tube 401, at the moment, the air flow can adsorb the paperboard on the suckers 402, the pumped air flow sequentially enters the exhaust tube 403 through the supporting tube 405 and enters the air inlet tube 13 through the air pump 404, the air flow in the air inlet tube 13 enters the air supply hose 12, the air flow in the air supply hose 12 enters the shunt tube 11, and the air flow in the shunt tube 11 enters the connecting tube 205, the air flow in the connecting pipe 205 vertically enters the inside of the positioning cylinder 202, at this time, the inner rotating blade 207 can be blown to rotate, when the air flow rotates to the through hole formed on the positioning cylinder 202, the air flow enters the inside of the nozzle 203 and is sprayed out, at this time, the air pressure in the inside can be detected through the air pressure sensor 208, when the air pressure is gradually increased, the air pressure indicates that no hole breaking occurs on the paper board, when the internal pressure keeps stable, the inside of the paper board is indicated to be broken, and then in the process of detecting the internal air tightness, the rotating blade 207 can rotate to drive the first tooth 302 to rotate, the first tooth 302 drives the second tooth 303 to rotate, the second tooth 303 drives the positioning rod 204 to rotate, meanwhile, the first air cylinder 9 is started, the first air cylinder 9 drives the mounting frame 301 to move, the positioning rod 204 is driven to move towards the inside of the paper board, meanwhile, the positioning rod 204 rotates to drive the infrared detector 304 on the surface to rotate in the moving process, and at this time, the internal flatness can be detected.
The wiring diagrams of the air pressure sensor 208, the infrared detector 304, the air pump 404, the first air cylinder 9 and the second air cylinder 10 in the present invention belong to common knowledge in the art, the working principle thereof is a known technology, and the model thereof is selected to be a proper model according to actual use, so the control mode and wiring arrangement of the air pressure sensor 208, the infrared detector 304, the air pump 404, the first air cylinder 9 and the second air cylinder 10 are not explained in detail.
The present invention is not limited to the above-mentioned embodiments, and any equivalent embodiments which can be changed or modified by the technical content disclosed above can be applied to other fields, but any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical substance of the present invention without departing from the technical content of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (3)
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| CN202411297680.8A CN118857604B (en) | 2024-09-18 | 2024-09-18 | A detection device and detection method for production of degradable paperboard |
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| CN202411297680.8A CN118857604B (en) | 2024-09-18 | 2024-09-18 | A detection device and detection method for production of degradable paperboard |
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| CN118857604B true CN118857604B (en) | 2025-02-14 |
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Citations (2)
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| CN112444346A (en) * | 2020-11-26 | 2021-03-05 | 薛汇晖 | Air tightness detection device for packaging container and implementation method thereof |
| CN114440777A (en) * | 2022-02-09 | 2022-05-06 | 连云港麦达包装有限公司 | Thickness detection device and method for corrugated paper packaging box production |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62279931A (en) * | 1986-05-29 | 1987-12-04 | レンゴ−株式会社 | Defective detector for single-sided corrugated board |
| JP3551990B2 (en) * | 1994-12-06 | 2004-08-11 | 日本農薬株式会社 | Bag defect detection device in the case |
| JP5274350B2 (en) * | 2009-04-14 | 2013-08-28 | キヤノン株式会社 | Recording material surface detection apparatus and image forming apparatus including the same |
| CN217605533U (en) * | 2021-12-29 | 2022-10-18 | 株洲市荷塘区瑞美包装有限公司 | A bending resistance detection device for corrugated cardboard production |
| CN116474697A (en) * | 2023-05-18 | 2023-07-25 | 福建省三明正元化工有限公司 | Preparation method and production device for producing water glass with low energy consumption |
| CN117799234A (en) * | 2023-11-16 | 2024-04-02 | 龙利得智能科技股份有限公司 | Corrugated paper local repair equipment for printing and packaging |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112444346A (en) * | 2020-11-26 | 2021-03-05 | 薛汇晖 | Air tightness detection device for packaging container and implementation method thereof |
| CN114440777A (en) * | 2022-02-09 | 2022-05-06 | 连云港麦达包装有限公司 | Thickness detection device and method for corrugated paper packaging box production |
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