CN107138859B - Laser online marking method and device for packaging material with surface film - Google Patents
Laser online marking method and device for packaging material with surface film Download PDFInfo
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- CN107138859B CN107138859B CN201710373926.9A CN201710373926A CN107138859B CN 107138859 B CN107138859 B CN 107138859B CN 201710373926 A CN201710373926 A CN 201710373926A CN 107138859 B CN107138859 B CN 107138859B
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- 239000005022 packaging material Substances 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000007246 mechanism Effects 0.000 claims description 25
- 238000004806 packaging method and process Methods 0.000 claims description 25
- 238000001514 detection method Methods 0.000 claims description 17
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 8
- 239000000758 substrate Substances 0.000 claims description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 4
- 239000001569 carbon dioxide Substances 0.000 claims description 4
- 238000005286 illumination Methods 0.000 claims description 3
- 239000013307 optical fiber Substances 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 230000008569 process Effects 0.000 abstract description 2
- 238000010330 laser marking Methods 0.000 description 27
- 210000003128 head Anatomy 0.000 description 19
- 239000000463 material Substances 0.000 description 16
- 235000013365 dairy product Nutrition 0.000 description 13
- 235000013305 food Nutrition 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 9
- 230000003746 surface roughness Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 239000003973 paint Substances 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 235000013361 beverage Nutrition 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 229940079593 drug Drugs 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 210000002489 tectorial membrane Anatomy 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 235000013410 fast food Nutrition 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000976 ink Substances 0.000 description 1
- 235000021056 liquid food Nutrition 0.000 description 1
- 235000020124 milk-based beverage Nutrition 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 235000021055 solid food Nutrition 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/361—Removing material for deburring or mechanical trimming
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/24—Ablative recording, e.g. by burning marks; Spark recording
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Thermal Transfer Or Thermal Recording In General (AREA)
- Auxiliary Devices For And Details Of Packaging Control (AREA)
Abstract
The invention discloses a laser on-line marking method and device for a packaging material with a surface film. The marking process comprises the following steps: leading in the pattern to be marked in the industrial personal computer, setting parameters of a laser, controlling laser beams generated by the laser to act on the inside of a transparent film layer of the inner layer of the packaging material or act on the inside of a colored layer through the transparent film layer, marking the pattern on the inside of the transparent film layer or the inside of the colored layer of the inner layer of the packaging material, detecting the marked pattern after marking, and rejecting detected products with unqualified marking. The pattern of the invention is marked in the transparent film layer or the colored layer, the anti-counterfeiting identification codes such as the two-dimensional code and the lot number are never worn, the inner surface of the packaging material is not damaged, the tissue layer structure and the sealing performance of the original packaging material are not damaged, the speed of marking the anti-counterfeiting identification codes such as the two-dimensional code and the lot number is high, the effect is clear and attractive, and the invention is suitable for packaging materials with various surface films.
Description
Technical Field
The invention belongs to the technical field of laser marking, and particularly relates to a laser online marking method and device for a packaging material with a surface film.
Background
With the improvement of the living standard of modern people, the attention on the health of the human body is increasing, especially in the field of fast-food consumer products, the inner surface of many packaging materials is covered with a transparent protective film to prevent food, medicines, beverages, dairy products and the like which directly enter the mouth of the human body from directly contacting with the packaging materials, because the inner surface of the packaging materials without the film is usually provided with substances harmful to the human body, such as printing ink, paint, pigment and the like.
On the other hand, with the rapid development of modern technology, counterfeit commodities are also becoming more and more rampant. While the traditional anti-counterfeiting technology is easy to imitate, the laser marking technology is difficult to erase because the generated mark is permanent, and is increasingly applied to commodity anti-counterfeiting. Meanwhile, various links of production, processing, circulation and sales of the commodity are traced, and the application of the laser marking technology to the packaging material is further promoted.
When the packaging material with the inner surface coated with the film is processed by adopting a laser marking technology, one case is that the film layer on the inner surface is broken down, and the other case is that the laser beam cannot penetrate the film layer and cannot be absorbed by the film layer. The former situation can cause that the transparent film layer can not play a role in protecting at one part, especially for fluid substances such as beverages, dairy products and the like, the probability of direct contact with the harmful layer of the packaging material is larger, and the defects are obvious. The latter situation may render laser marking simply impractical.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a laser on-line marking method and a device for packaging materials with surface coating, which ensure that the inner surface of the packaging materials is not damaged during marking and the sealing protection function of the packaging materials is ensured
The technical scheme adopted by the invention is as follows: a method for laser on-line marking of packaging materials for surface coating comprises the following steps: leading in the pattern to be marked in the industrial personal computer, setting parameters of a laser, controlling laser beams generated by the laser to act on the inside of a transparent film layer of the inner layer of the packaging material or act on the inside of a colored layer through the transparent film layer, marking the pattern on the inside of the transparent film layer or the inside of the colored layer of the inner layer of the packaging material, detecting the marked pattern after marking, and rejecting detected products with unqualified marking.
Further, the pattern inside the transparent film layer or inside the colored layer is marked with a depth of less than 10 μm.
The working principle of the method is different according to the different wave bands of the adopted laser light sources. For the laser light source with the wavelength smaller than 650nm, the working principle of the method is as follows: the lifting support is finely adjusted in the Z direction by fine control of the servo motor, so that laser beams penetrate through the transparent film layer on the inner surface of the material, the focused laser beams are focused on the second colored layer, and the energy density of the laser absorbed by the colored layer is greater than the critical value of material damage, so that a micron-sized fracture layer is generated on the surface of the material. The energy of the laser beam is regulated and controlled by a control technology such as a computer, so that the microscopic performance of the second colored layer can be just changed without generating a macroscopic burst layer, the action range of the laser beam is limited within a few micrometers on the surface of the second colored layer, and the whole second colored layer is not penetrated. Thus, the observer cannot clearly observe the marking pattern formed after laser marking no matter from the angle of the front surface or the back surface of the packaging material to be perpendicular to the surface of the material. Only when strong light irradiates the surface of the material or the observation angle is inclined with the vertical direction, the marking pattern after laser marking can be identified by the contrast of the surface roughness of the second colored layer.
For the laser light source with the wavelength larger than 650nm, the working principle of the method is as follows: the laser beam is mostly absorbed by the first transparent film layer on the surface of the material, and the laser beam cannot penetrate the transparent film layer on the inner surface of the packaging material to reach the second colored layer. The laser marking head is finely adjusted in the Z direction by finely controlling the servo motor, so that the focus of laser beam convergence is just positioned inside a transparent film layer on the inner surface of the packaging material, and the energy density of laser absorbed by the transparent film layer is greater than the critical value of damage of the transparent film layer, thereby enabling the surface of the transparent film layer to generate a micron-sized cracking layer. The energy of the laser beam is regulated and controlled by a control technology such as a computer, so that the microscopic performance of the first transparent film layer can be just converted but not burst, the action range of the laser beam is limited within a few micrometers of the surface of the first transparent film layer, and the whole transparent film layer is not penetrated. In this way, the observer can not clearly observe the marking pattern formed after laser marking by observing the front or back surface perpendicular to the surface of the material. Only when strong light irradiates the surface of the material or the observation angle is inclined with the vertical direction, the marking pattern after laser marking can be identified by the contrast of the surface roughness.
The utility model provides a laser on-line marking device for packaging material of surface tectorial membrane, includes the support and sets up in operation cabinet and lifting support of support one side, install the industrial computer on the operation cabinet, install the laser instrument on the lifting support, the industrial computer is connected with the laser instrument electricity, install conveying platform on the support, place the packaging material of surface tectorial membrane on the conveying platform, the marking head of laser instrument just is to the conveying platform top, be equipped with detection mechanism and rejecting mechanism on the support, detection mechanism sets up in the conveying platform top, rejecting mechanism sets up in conveying platform one side, marking head, detection mechanism and rejecting mechanism arrange in proper order along conveying platform's advancing direction.
Further, the detection mechanism comprises a strong light source for providing illumination detection and an industrial camera for discriminating the marked pattern.
Further, the packaging material comprises a first transparent film layer, a colored layer and a substrate layer which are sequentially laminated, wherein the first transparent film layer is an inner layer of the packaging material.
Further, the first transparent film layer comprises a plurality of layers of transparent films, and the transparent films are EVA transparent films, PE transparent films, PP transparent films, PET transparent films, PVC transparent films, TPR transparent films or TPU transparent films.
Further, a second transparent film layer is arranged between the colored layer and the basal layer.
Further, the laser is any one of an all-solid-state infrared laser, a green laser, an ultraviolet laser, an optical fiber laser or a carbon dioxide laser, and the laser output by the laser is pulse laser or continuous laser.
Still further, the lifting support comprises a screw rod, a turbine for coarse adjustment and a servo motor for fine adjustment, wherein the screw rod is connected with the turbine in a matched mode, the screw rod is connected with the servo motor through a coupler, and the servo motor is electrically connected with an industrial control computer.
The laser marking method of the invention can select to mark the shallow layer pattern below 10 microns on the surface of the transparent film layer by laser, or can select to make the laser beam penetrate the transparent film layer to reach the middle colored layer of the packaging material, and mark the shallow layer pattern below 10 microns on the surface of the middle layer by laser. The transparent film layer on the surface of the packaging material cannot be broken down by the two methods, and the sealing performance is good; the marked pattern is observed from the angle of the vertical material surface by naked eyes, so that the pattern formed after laser marking cannot be clearly observed, and the pattern after laser marking can be identified through the contrast of the surface roughness of the marked layer only after the material surface is irradiated by strong light or the observed angle is inclined to the vertical direction to a certain extent. Moreover, the processed surface is the inner surface of the packaging material, and in actual commodity packaging, only the package is disassembled, so that the processed part can be found. Thus, the possibility of counterfeit is greatly reduced, and the traceability of the commodity is easier to realize in this way.
The pattern of the invention is marked in the transparent film layer or the colored layer, the anti-counterfeiting identification codes such as two-dimensional codes, batch numbers and the like are never worn, the inner surface of the packaging material is not damaged, and the tissue layer structure and the sealing performance of the original packaging material are not damaged. The device integrates marking, detection and rejection, shortens the subsequent operation procedures, has higher efficiency, has high speed of marking anti-counterfeiting identification codes such as two-dimension codes, batch numbers and the like, has clear and beautiful effect, is suitable for packaging materials with various surface films, and can be widely applied to the fields of industries such as liquid foods, milk drinks, solid foods, medicines, chemical products, daily necessities and the like.
Drawings
Fig. 1 is a schematic structural diagram of a marking device according to the present invention.
Fig. 2 is a schematic structural view of a surface-coated packaging material according to the present invention.
FIG. 3 is a schematic diagram of a marking location according to the present invention.
In the figure: 1-first transparent film layer, 2 transparent film, 3-colored layer, 4-second transparent film layer, 5-basal layer, 6-third transparent film layer, 7-operation cabinet, 8-industrial computer, 9-laser, 10-marking head, 11-lifting bracket, 12-conveying platform, 13-packaging material, 14-light source, 15-industrial camera, 16-detection mechanism, 17-rejecting mechanism and 18-support.
Detailed Description
The invention will now be described in further detail with reference to the drawings and specific examples, which are given for clarity of understanding and are not to be construed as limiting the invention.
As shown in fig. 1, the laser online marking device for the surface-coated packaging material comprises a support 18, an operation cabinet 7 and a lifting support 11, wherein the operation cabinet 7 and the lifting support 11 are positioned on two sides or the same side of the support 18, an industrial personal computer 8 is installed on the operation cabinet 7, a laser 9 is installed on the lifting support 11, the industrial personal computer 7 is electrically connected with the laser 9, a conveying platform 12 is installed on the support 18, the surface-coated packaging material 13 is placed on the conveying platform 12, the conveying platform 12 conveys the surface-coated packaging material 13 at a certain speed, a marking head 10 of the laser 9 is right over the conveying platform 12, a detection mechanism 16 and a removing mechanism 17 are arranged on the support 08, the detection mechanism 16 is arranged above the conveying platform 12, the removing mechanism 17 is arranged on one side of the conveying platform 12, and the marking head 10, the detection mechanism 16 and the removing mechanism 17 are sequentially arranged along the advancing direction (namely, arrow X direction shown in fig. 1).
The industrial personal computer 8 is internally provided with a marking control system, and the marking control system can realize a plurality of functions of controlling the switching light of a laser, the vibrating mirror action on a laser marking head, the fine adjustment of a lifting bracket, the acquisition and online editing of the content to be marked, the communication with a conveying platform control system, the communication with an industrial camera, the input and output of important signals and the like.
The lifting support 11 takes a screw rod with a thin lead as a main body structure, is provided with a manual turbine and a servo motor, the servo motor is electrically connected with an industrial control computer, the manual turbine can realize rough adjustment, and the servo motor is connected with the screw rod through a coupler, so that electric fine adjustment can be realized.
The detection mechanism 16 includes an intense light source 14 for providing illumination detection and an industrial camera 15 for screening the marked pattern.
The rejecting mechanism 17 consists of a supporting seat, a rotary cylinder, a lifting cylinder and a sucker, wherein the rotary cylinder and the lifting cylinder are electrically connected with an industrial control computer. When unqualified products are detected, the lifting cylinder firstly acts downwards, so that the sucking disc can contact the packaging material to suck the packaging material by the aid of the sucking force, and then the lifting cylinder moves upwards. Then, the rotary cylinder rotates 180 degrees to rotate the end with the packaging material to the outer side of the conveying platform, then the lifting cylinder acts downwards to approach the waste box, the sucking disc withdraws the adsorption force, and the packaging material with unqualified marking falls back into the waste box under the action of gravity.
As shown in fig. 2, the surface-coated packaging material 13 is composed of the first transparent film layer 1, the colored layer 3, and the base layer 5, which are closely adhered from the inside to the outside. The first transparent film layer 1 may be further composed of a plurality of transparent films 2 having a smaller thickness. Likewise, the intermediate colored layer 3 and the outer base layer 5 may also be composed of a multilayer material. A second transparent film layer 4 may also be added between the coloured layer 3 and the substrate layer 5. A third transparent film layer 6 may also be added to the exterior of the substrate layer 5.
The first transparent film layer 1, the second transparent film layer 4 and the third transparent film layer 6 have substantially the same structure, and the first transparent film layer 1 is any one of an EVA transparent film, a PE transparent film, a PP transparent film, a PET transparent film, a PVC transparent film, a TPR transparent film and a TPU transparent film, or is a laminate of these films, and the thickness thereof is generally 0.2mm or less.
The colored layer 3 is a pigment layer, a paint layer, an ink layer or a metal foil, and the thickness thereof is generally 1mm or less.
The substrate layer 5 is a cardboard, plastic or metal plate, typically having a thickness of 1-3mm.
The laser 9 is any one of an all-solid-state infrared laser, a green laser, an ultraviolet laser, an optical fiber laser or a carbon dioxide laser, and the laser output by the laser is pulse laser or continuous laser.
The method for realizing laser marking on the inner surface of the packaging material with the surface coated by the marking device comprises the following steps:
1) The content to be marked is imported into an industrial personal computer, and the marked content is generally the production date, batch number, quality guarantee period, bar code, two-dimensional code and the like of the packaging material;
2) Manually shaking a hand wheel on the lifting support, and roughly adjusting the lifting support to ensure that the focused focal position of the laser beam after passing through the marking head of the laser is approximately on the packaging material on the conveying platform;
3) Inputting corresponding instructions on a marking control system according to different wave bands of a laser light source, controlling a servo motor on a lifting bracket through the instructions, and driving a marking head of a laser on the lifting bracket to finely adjust up and down by the servo motor so that the focal position of a laser beam is on a first transparent film layer or a colored layer of a packaging material, as shown in fig. 3;
for the laser source with the wavelength less than 650nm, the laser beam is controlled to penetrate through the first transparent film layer of the packaging material, the focused focal point of the laser beam acts on the point B on the colored layer, and the energy density of the laser absorbed by the colored layer is greater than the critical value of material damage, so that a micron-sized cracking layer is generated on the surface of the colored layer. The energy of the laser beam is regulated and controlled by a control technology such as a computer, so that the microscopic performance of the colored layer can be just converted without generating a macroscopic burst layer, the action range of the laser beam is limited within 10 micrometers of the surface of the colored layer (namely, the vertical distance between the point B and the surface 3.1 of the colored layer is smaller than 10 micrometers), and the whole colored layer is not penetrated. Thus, the observer cannot clearly observe the marking pattern formed after laser marking no matter from the angle of the front surface or the back surface of the packaging material to be perpendicular to the surface of the material. Only when strong light irradiates the surface of the material or the observation angle is inclined with the vertical direction to a certain extent, the marking pattern after laser marking can be identified through the contrast of the surface roughness of the colored layer.
For a laser source with the wavelength larger than 650nm, most of laser beams are absorbed by a first transparent film layer of a packaging material, the focused focal point of the laser beams acts on the point A on the colored layer, the laser beams can not penetrate through the first transparent film layer to reach the colored layer, the focused focal point of the laser beams is just positioned on the first transparent film layer by adjusting the height of a laser marking head on equipment, and the energy density of the laser beams absorbed by the first transparent film layer is larger than the damage critical value of the laser beams, so that a micron-sized broken layer is generated on the surface of the broken layer. The energy of the laser beam is regulated and controlled by a control technology such as a computer, so that the microscopic performance of the first transparent film layer can be just converted but not burst, the action range of the laser beam is limited within 10 micrometers of the surface of the first transparent film layer (namely, the vertical distance between the point A and the surface 1.1 of the first transparent film layer is smaller than 10 micrometers), and the whole first transparent film layer is not penetrated. In this way, the observer can not clearly observe the marking pattern formed after laser marking by observing the front or back surface perpendicular to the surface of the material. Only when strong light irradiates the surface of the material or the observation angle is inclined with the vertical direction, the marking pattern after laser marking can be identified by the contrast of the surface roughness.
4) Editing the technological parameters such as laser power, laser frequency, marking speed, switching light delay and the like required by marking on a marking control system;
5) The sensor on the conveying platform detects the conveyed packaging material, triggers the laser to emit light and the vibrating mirror on the laser marking head to perform on-line marking;
6) The packaging material after marking is transmitted to the positions of the light source and the industrial camera through the conveying platform, the industrial camera is used for screening the marked patterns under strong light irradiation, if the patterns are qualified, the packaging material is conveyed to the next working procedure; if the packaging material is unqualified, the industrial camera outputs information to the marking control system, and the marking control system sends an instruction to a removing mechanism next to the industrial camera to remove the unqualified packaging material from the conveying platform.
After the devices are connected according to the schematic device structure shown in fig. 1. The marking control system is connected with hardware of the marking control system through a data connecting wire, the hardware of the marking control system is connected with the laser and the marking head, after the marking control system receives a trigger signal sent by a sensor on the conveying platform, the laser is controlled to switch light and shake the mirror on the marking head to achieve marking of required patterns, and the marking process is specifically described by taking two packaging materials as examples.
Example one: and (5) marking a dairy product packaging box.
The dairy product packaging box is composed of 6 layers of PE transparent films, aluminum foils, PE transparent films, paperboards and PE transparent films from inside to outside. The production date and batch number of each packing box are marked on line on the two PE transparent films on the surface, and the steps are as follows:
1) The production date and batch number to be marked are transmitted to the industrial personal computer through the corresponding interface, and the industrial personal computer leads the production date and batch number to the software of the marking control system;
2) Manually shaking a hand wheel on the lifting support, roughly adjusting the lifting support, and enabling the focused focal position of the laser beam after passing through the laser marking head to be approximately on a dairy product packaging box covered on the upper surface of the conveying platform;
3) The selected laser is a carbon dioxide laser with the wavelength of 9.3-10.6 microns, a corresponding instruction is input on a marking control system, a servo motor on a lifting support is controlled by the instruction, and a laser marking head on the lifting support is driven by the servo motor to finely adjust up and down, so that the focal position of a laser beam is just on a first PE transparent film of a dairy product packaging box;
4) Selecting laser repetition frequency of 50KHz, laser delay of 50 mu s on, laser delay of 30 mu s off, jump delay of 30 mu s, vibrating mirror scanning speed of 4500mm/s and jump speed of 9000mm/s on software of a marking control system;
5) The sensor on the conveying platform detects the conveyed dairy product packaging box, triggers the laser to emit light and the vibrating mirror on the laser marking head to perform on-line marking;
6) The dairy product packaging box after marking is transmitted to the position where the strong light source and the industrial camera are located through the conveying platform, the marked patterns are screened by the industrial camera under strong light irradiation, 100 dairy product packaging boxes are tested in a short time, and all the dairy product packaging boxes are qualified.
In the practical product, the side of the dairy product packaging box marked with the production date and the batch number is arranged on the inner surface of the packaging box, the marking depth is below 10 microns, marked contents are not easy to identify by naked eyes, and the marked contents can be identified by the contrast of the surface roughness of the dairy product packaging box only under the irradiation of strong light, so that the dairy product packaging box can play a good role in anti-counterfeiting and tracing.
Example two: marking the food packaging cover.
The food packaging cover is composed of 3 layers of PET transparent film, paint layer and aluminum plate from inside to outside. The production date and batch number of each food packaging cover are marked on line on the middle paint layer, and the steps are as follows:
1) The production date and batch number to be marked are transmitted to the industrial personal computer through the corresponding interface, and the industrial personal computer leads the production date and batch number to the software of the marking control system;
2) Manually shaking a hand wheel on the lifting support, and roughly adjusting the lifting support to ensure that the focused focal position of the laser beam after passing through the laser marking head is approximately on the packaging material coated on the upper surface of the conveying platform;
3) The selected laser is an ultraviolet laser with the wavelength of 355nm, a corresponding instruction is input on a marking control system, a servo motor on the lifting support is controlled by the instruction, and a laser marking head on the lifting support is driven by the servo motor to finely adjust up and down, so that the focal position of a laser beam is just on a middle paint layer of the food packaging cover;
4) Selecting laser repetition frequency of 20KHz, laser delay of 80 mu s on, laser delay of 120 mu s off, jump delay of 50 mu s, vibrating mirror scanning speed of 7000mm/s and jump speed of 10000mm/s on software of a marking control system;
5) The sensor on the conveying platform detects the conveyed packaging material with the film coated on the surface, triggers the laser to emit light and the galvanometer on the laser marking head to complete on-line marking;
6) The food packaging cover after marking is transmitted to the position where the strong light source and the industrial camera are located through the conveying platform, the marked patterns are screened by the industrial camera under strong light irradiation, and 200 food packaging covers are tested in a short time and are all qualified.
In the actual product, the side of the food packaging cover marked with the production date and the batch number faces the inside of the food packaging can, the marking depth is below 10 microns, and the food packaging cover can be identified by the contrast of the surface roughness by adopting strong light irradiation only under the condition of opening the food packaging cover and is not easy to identify by naked eyes, so that the food packaging cover can play a good role in anti-counterfeiting and tracing.
What is not described in detail in this specification is prior art known to those skilled in the art.
Claims (6)
1. A laser on-line marking method for a packaging material with a surface film is characterized by comprising the following steps: leading in a pattern to be marked, setting parameters of a laser, and controlling the laser beam generated by the laser to act on the inside of a transparent film layer of the inner layer of the packaging material when the laser wavelength is more than 650nm so that the pattern is marked in the inside of the transparent film layer of the inner layer of the packaging material; when the laser wavelength is less than 650nm, controlling laser beams generated by a laser to penetrate through a transparent film layer to act inside a colored layer, marking patterns inside the colored layer of the packaging material, detecting the marked patterns after marking is finished, and removing detected products with unqualified marks; the marking depth of the pattern inside the transparent film layer or inside the colored layer is less than 10 mu m.
2. A laser on-line marking device for realizing the laser on-line marking method for a surface-coated packaging material according to claim 1, characterized in that: the automatic packaging machine comprises a support (18) and an operation cabinet (7) and a lifting support (11) which are arranged on one side of the support (18), wherein an industrial personal computer (8) is arranged on the operation cabinet (7), a laser (9) is arranged on the lifting support (11), the industrial personal computer (8) is electrically connected with the laser (9), a conveying platform (12) is arranged on the support (18), a packaging material (13) with a film coated on the surface is placed on the conveying platform (12), a marking head (10) of the laser (9) is right opposite to the upper side of the conveying platform (12), a detection mechanism (16) and a removing mechanism (17) are arranged on the support (18), the detection mechanism (16) is arranged above the conveying platform (12), the removing mechanism (17) is arranged on one side of the conveying platform (12), and the marking head (10), the detection mechanism (16) and the removing mechanism (17) are sequentially arranged along the advancing direction of the conveying platform (12). The detection mechanism (16) comprises a strong light source (14) for providing illumination detection and an industrial camera (15) for screening the marked pattern; the lifting support comprises a screw rod, a turbine for coarse adjustment and a servo motor for fine adjustment, wherein the screw rod is connected with the turbine in a matched mode, the screw rod is connected with the servo motor through a coupler, and the servo motor is electrically connected with an industrial control computer.
3. The laser on-line marking device according to claim 2, wherein: the packaging material (13) comprises a first transparent film layer (1), a colored layer (3) and a substrate layer (5) which are sequentially arranged in a laminated mode, wherein the first transparent film layer (1) is an inner layer of the packaging material.
4. A laser on-line marking device as claimed in claim 3, wherein: the first transparent film layer (1) comprises a plurality of layers of transparent films (2), and the transparent films are EVA transparent films, PE transparent films, PP transparent films, PET transparent films, PVC transparent films, TPR transparent films or TPU transparent films.
5. A laser on-line marking device as claimed in claim 3, wherein: a second transparent film layer (4) is arranged between the colored layer (3) and the basal layer (5).
6. The laser on-line marking device according to claim 2, wherein: the laser (9) is any one of an all-solid-state infrared laser, a green laser, an ultraviolet laser, an optical fiber laser or a carbon dioxide laser, and the laser output by the laser is pulse laser or continuous laser.
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| CN201710373926.9A CN107138859B (en) | 2017-05-24 | 2017-05-24 | Laser online marking method and device for packaging material with surface film |
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| CN107138859B true CN107138859B (en) | 2023-12-15 |
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