CN112846520B - Method for endowing surface of film-coated aluminum foil with black codes based on ultrafast laser - Google Patents
Method for endowing surface of film-coated aluminum foil with black codes based on ultrafast laser Download PDFInfo
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- CN112846520B CN112846520B CN202011605141.8A CN202011605141A CN112846520B CN 112846520 B CN112846520 B CN 112846520B CN 202011605141 A CN202011605141 A CN 202011605141A CN 112846520 B CN112846520 B CN 112846520B
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- 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
- B23K26/362—Laser etching
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- 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
- B23K26/14—Working by laser beam, e.g. welding, cutting or boring using a fluid stream, e.g. a jet of gas, in conjunction with the laser beam; Nozzles therefor
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- 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
- B23K26/60—Preliminary treatment
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- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/007—Marks, e.g. trade marks
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- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/08—Non-ferrous metals or alloys
- B23K2103/10—Aluminium or alloys thereof
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- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/30—Organic material
- B23K2103/42—Plastics
Abstract
The invention relates to the technical field of laser processing, in particular to a method for endowing a film-coated aluminum foil surface with a black code based on ultrafast laser, which comprises the following steps: s1, cleaning and dedusting a to-be-treated film-coated aluminum foil surface to obtain an aluminum foil sample with a clean surface; s2, blowing clean air to the surface to be processed of the aluminum foil obliquely before laser processing; s3, performing laser scanning treatment on the surface to be processed of the aluminum foil by using an ultrafast laser by using a laser processing technology, and processing a microstructure on the surface of the sample; and S4, continuously blowing clean air to the surface to be processed of the aluminum foil obliquely 200-1000ms after the laser is turned off, thus obtaining a finished product. The scheme has the advantages of simple process, high production efficiency and environmental protection, and due to the adoption of the ultrafast laser, the adverse effect of a laser heat affected zone on coding quality can be reduced to the maximum extent due to the narrow pulse width characteristic of the ultrafast laser; on the other hand, the influence on the surface film layer is only limited to a local part, a breakthrough port for the film layer to fall off is not formed, and the original adhesive force between the film layer and the aluminum foil is not reduced.
Description
Technical Field
The invention relates to the technical field of laser processing, in particular to a method for endowing a black code on the surface of a laminated aluminum foil based on ultrafast laser.
Background
The laminated aluminum foil is an important packaging material and is widely applied to packaging containers for directly containing milk powder, coffee powder, chocolate powder and other dry goods. Generally, two-dimensional codes are given on the surface of food packages to trace back products, or product marketing is performed based on interactive experiences of the two-dimensional codes. Since the laser generates a permanent mark which is not easy to remove, the method of using laser to code the surface of the food package is a common technical means.
In general, a black two-dimensional code is most easily recognized because of its high contrast with the background color. However, since metallic aluminum is a highly reflective material for laser light, it is difficult to produce a black two-dimensional code. Due to the adverse effect of the surface film layer, the film-coated aluminum foil is more difficult to generate black two-dimensional codes under the action of laser.
Therefore, it is an urgent need to solve the technical problem to develop a method for applying black codes on the surface of a film-coated aluminum foil, which has simple process and high efficiency and is suitable for industrial application.
Disclosure of Invention
The invention provides a method for endowing a surface of a laminated aluminum foil with black codes based on ultrafast laser, which solves the technical problem that the difficulty of endowing the surface of the laminated aluminum foil with the black codes is high.
The invention provides a method for endowing a black code on the surface of a film-coated aluminum foil based on ultrafast laser for solving the technical problem, which comprises the following steps:
s1, cleaning and dedusting a to-be-treated film-coated aluminum foil surface to obtain an aluminum foil sample with a clean surface;
s2, blowing clean air to the surface to be processed of the aluminum foil obliquely before laser processing;
s3, performing laser scanning treatment on the surface to be processed of the aluminum foil by using an ultrafast laser by using a laser processing technology, and processing a microstructure on the surface of the sample;
and S4, continuously obliquely blowing clean air to the surface to be processed of the aluminum foil 200-1000ms after the laser is turned off, thus obtaining a finished product.
Preferably, the S2 specifically includes: and blowing clean air to the surface to be processed of the aluminum foil obliquely 200-1000ms before the laser emits light, wherein the inclination angle of the air nozzle is 30-45 degrees, and the air pressure is set to be 0.5-0.8Mpa.
Preferably, the S3 further includes: the oblique blowing of clean air is kept during the laser scanning process.
Preferably, the center wavelength of the ultrafast laser is less than 1200nm, the repetition frequency range is 50kHz-500kHz, the pulse width is less than 10ps, and the single pulse energy is less than 0.2mJ.
Preferably, the film-coated aluminum foil is 2A12 aluminum alloy, the surface film layer is polyethylene film PE, cast polypropylene film CPP or biaxially oriented polyester film BOPET, and the thickness of the surface film layer is 10-20 μm.
Preferably, the laser coding mode of the ultrafast laser is linear filling coding, and the filling distance is 0.01-0.1mm.
Preferably, the laser scanning process adopts a galvanometer system to carry out light beam scanning, and the speed of galvanometer scanning is 1500-15000 mm/s.
Has the beneficial effects that: the invention provides a method for endowing a black code on the surface of a laminated aluminum foil based on ultrafast laser, which comprises the following steps of: s1, cleaning and dedusting a to-be-treated film-coated aluminum foil surface to obtain an aluminum foil sample with a clean surface; s2, blowing clean air to the surface to be processed of the aluminum foil obliquely before laser processing; s3, performing laser scanning treatment on the surface to be processed of the aluminum foil by using an ultrafast laser by using a laser processing technology, and processing a microstructure on the surface of the sample; and S4, continuously obliquely blowing clean air to the surface to be processed of the aluminum foil 200-1000ms after the laser is turned off, thus obtaining a finished product. The technical scheme has the advantages of simple process, high production efficiency and environmental protection, and due to the adoption of the ultrafast laser, the adverse effect of a laser heat affected zone on the coding quality can be reduced to the maximum extent by the narrow pulse width characteristic of the ultrafast laser, so that the marking of high-quality black QR codes, DM codes, bar codes and the like on the surface of the film-coated aluminum foil with high reflection characteristic to the laser becomes possible; on the other hand, the influence on the surface film layer is only limited to a local part, a breakthrough opening for the film layer to fall off is not formed, and the original reduction of the adhesive force between the film layer and the aluminum foil is not caused. And meanwhile, the film layer which is not completely removed does not remain near the laser-ablated lines.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to make the technical solutions of the present invention practical in accordance with the contents of the specification, the following detailed description is given of preferred embodiments of the present invention with reference to the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a flow chart of a method for applying black codes to the surface of a laminated aluminum foil based on ultrafast laser according to the present invention;
FIG. 2 shows that the filling space is 0.05mm and the size of the QR code is 10 x 10mm in the method for applying the black code on the surface of the laminated aluminum foil based on the ultrafast laser2A temporal pre-coding path effect map.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention. The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, the present invention provides a method for applying black codes to a surface of a film-coated aluminum foil based on ultrafast laser, comprising the following steps: s1, cleaning and dedusting the surface of the coated aluminum foil to be treated to obtain an aluminum foil sample with a clean surface. The surface of the coated aluminum foil is provided with a film layer and is also a surface to be processed, and the surface is cleaned before use, so that the processing precision is prevented from being influenced by surface gravels or impurities.
S2, blowing clean air to the surface to be processed of the aluminum foil obliquely before laser processing; the cleaning mode adopts oblique blowing, and the blowing source adopts clean air. The air blowing operation is convenient, the surface of the coated aluminum foil to be processed is smooth, and dust or gravel on the surface can be cleaned through air blowing.
S3, performing laser scanning treatment on the surface to be processed of the aluminum foil by using an ultrafast laser by using a laser processing technology, and processing a microstructure on the surface of the sample;
and S4, continuously blowing clean air to the surface to be processed of the aluminum foil obliquely 200-1000ms after the laser is turned off, thus obtaining a finished product. And continuously obliquely blowing clean air to the surface to be processed of the aluminum foil 200-1000ms after the laser is turned off, so that the black QR code, DM code, bar code and the like can be generated on the surface of the film-coated aluminum foil. The surface is continuously blown within a time period of 200-1000ms after the laser processing is finished, and the quality of a finished product is influenced if the time is too early or too late.
The technical scheme has the advantages of simple process, high production efficiency and environmental protection, and due to the adoption of the ultrafast laser, the adverse effect of a laser heat affected zone on the coding quality can be reduced to the maximum extent by the narrow pulse width characteristic of the ultrafast laser, so that the marking of high-quality black QR codes, DM codes, bar codes and the like on the surface of the film-coated aluminum foil with high reflection characteristic to the laser becomes possible; on the other hand, the influence on the surface film layer is only limited to a local part, a breakthrough opening for the film layer to fall off is not formed, and the original reduction of the adhesive force between the film layer and the aluminum foil is not caused. Meanwhile, the film layer which is not completely removed does not remain near the laser-ablated lines.
As shown in FIG. 2, the filling pitch is 0.05mm, and the size of the QR code is 10 × 10mm2A temporal pre-coding path effect map.
Preferably, the S2 specifically includes: and blowing clean air obliquely to the surface to be processed of the aluminum foil 200-1000ms before the laser emits light, wherein the inclination angle of the air nozzle is 30-45 degrees, and the air pressure is set to be 0.5-0.8Mpa. Because the surface smoothness of the film-coated aluminum foil directly influences the processing precision, and dust and impurity particles are very easily adhered to the surface of the film-coated aluminum foil, through verification and analysis, clean air needs to be blown obliquely to the surface to be processed of the aluminum foil, namely the surface of the film-coated aluminum foil, 200-1000ms before the laser is started before the laser emits light, so that the surface cleanness can be ensured, resources cannot be wasted, and the surface is prevented from being blown constantly.
Preferably, the S3 further includes: the process of laser scanning treatment is kept to blow clean air obliquely. During laser machining, it is also necessary to keep the blow air constantly. And stopping blowing air after 200-1000 ms. Namely, continuously blowing clean air obliquely to the surface to be processed of the aluminum foil 200-1000ms after the marking laser is turned off.
In a preferable scheme, the central wavelength of the ultrafast laser is less than 1200nm, the repetition frequency range is 50kHz-500kHz, the pulse width is less than 10ps, and the single pulse energy is less than 0.2mJ. The pulse width is one of important factors for ensuring that the black two-dimensional code is marked, the smaller the pulse width is, the higher the instantaneous energy of the laser is, the higher the peak power is, the action time of the laser on the surface of the material can be effectively shortened, and the instantaneous single-pulse laser acts on the surface of the material to mark the material without damaging the material.
In the preferred scheme, the mean laser power range of the ultrafast laser is 40-70W, the central wavelength range of the laser is 1064 +/-2 nm, the marking speed range is 200-3500mm/s, and the repetition frequency range is 50-300KHz. In one specific implementation scenario, the size of the QR code is 10 × 10mm2-12 × 12mm2The spacing between the filling lines is 0.01-0.1mm, specifically the filling spacing is 0.05mm. The optimized laser marking parameters are as follows: the average laser power is 40-70W, the laser central wavelength is 1064 +/-2 nm, the marking speed is 200-3500mm/s, and the repetition frequency is 50-300KHz.
In a preferred scheme, the film-coated aluminum foil is 2A12 aluminum alloy, the surface film layer is polyethylene film PE, cast polypropylene film CPP or biaxially oriented polyester film BOPET, and the thickness of the surface film layer is 10-20 μm.
In the preferable scheme, the laser scanning adopts a galvanometer system to carry out light beam scanning, the speed of the galvanometer scanning is 1500-15000 mm/s, and the on-off of the laser and the scanning range, scanning track and processing speed of the galvanometer system are controlled and set by a computer program.
The following is a brief description of the process with a specific embodiment:
firstly, cleaning and dedusting the surface of the laminated aluminum foil to be processed to obtain an aluminum foil sample with a clean surface. The specific cleaning method can be ultrasonic cleaning or clean air blowing, and liquid and the like remained on the surface need to be dried after the cleaning is finished.
And secondly, blowing clean air obliquely to the surface to be processed of the aluminum foil 200-1000ms before the laser emits light, wherein the inclination angle of the air nozzle is 30-45 degrees, and the air pressure is set to be 0.5-0.8Mpa.
And thirdly, optimizing the laser marking parameters, and processing the required QR code on the surface of the aluminum foil by utilizing the optimized laser marking parameters through a linear filling laser marking mode.
The size of the QR code is 10-10 mm 2-12-1 mm2, and the distance between the filling straight lines is 0.01-0.1mm. The optimized laser marking parameters are as follows: the average laser power is 40-70W, the laser central wavelength is 1064 +/-2 nm, the marking speed is 200-3500mm/s, and the repetition frequency is 50-300KHz.
And then, continuously blowing clean air to the surface to be processed of the aluminum foil in an inclined way 200-1000ms after the marking laser is turned off.
Has the advantages that:
(1) Because the ultrafast laser is adopted, the adverse effect of a laser heat affected zone on coding quality can be reduced to the maximum extent due to the narrow pulse width characteristic of the ultrafast laser, so that the marking of high-quality black QR codes, DM codes, bar codes and the like on the surface of the film-coated aluminum foil with high reflection characteristic to the laser becomes possible;
(2) The influence on the surface film layer is only limited to local parts, a breakthrough for the film layer to fall off is not formed, and the original adhesive force between the film layer and the aluminum foil is not reduced. And meanwhile, the film layer which is not completely removed does not remain near the laser-ablated lines.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; the present invention may be readily implemented by those of ordinary skill in the art as illustrated in the accompanying drawings and described above; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the scope of the invention as defined by the appended claims; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (4)
1. A method for endowing a black code on the surface of a laminated aluminum foil based on ultrafast laser is characterized by comprising the following steps:
s1, cleaning and dedusting a to-be-treated film-coated aluminum foil surface to obtain an aluminum foil sample with a clean surface; the film-coated aluminum foil is 2A12 aluminum alloy, the surface film layer is polyethylene film PE, cast polypropylene film CPP or biaxially oriented polyester film BOPET, and the thickness of the surface film layer is 10-20 mu m;
s2, blowing clean air to the surface to be processed of the aluminum foil obliquely before laser processing; specifically, the laser blows clean air obliquely to the surface to be processed of the aluminum foil 200-1000ms before light is emitted, the inclination angle of an air nozzle is 30-45 degrees, and the air pressure is set to be 0.5-0.8Mpa;
s3, performing laser scanning treatment on the surface to be processed of the aluminum foil by using an ultrafast laser by using a laser processing technology, and processing a microstructure on the surface of the sample; the center wavelength of the ultrafast laser is less than 1200nm, the range of the repetition frequency is 50kHz-500kHz, the pulse width is less than 10ps, and the single pulse energy is less than 0.2mJ;
and S4, continuously blowing clean air to the surface to be processed of the aluminum foil obliquely 200-1000ms after the laser is turned off, thus obtaining a finished product.
2. The method for applying black codes to the surface of the film-coated aluminum foil based on the ultrafast laser as claimed in claim 1, wherein the step S3 further comprises: the process of laser scanning treatment is kept to blow clean air obliquely.
3. The method for giving the black code on the surface of the laminated aluminum foil based on the ultrafast laser as claimed in claim 1, wherein the laser coding mode of the ultrafast laser is linear filling coding, and the filling distance is 0.01-0.1mm.
4. The method for applying the black color code on the surface of the film-coated aluminum foil based on the ultrafast laser as claimed in claim 1, wherein the laser scanning process adopts a galvanometer system to scan the light beam, and the speed of the galvanometer scanning is 1500mm/s-15000mm/s.
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| US20050255406A1 (en) * | 2004-05-11 | 2005-11-17 | Shlomo Assa | Marking on a thin film |
| JP2007229778A (en) * | 2006-03-02 | 2007-09-13 | Toppan Printing Co Ltd | Marking method and apparatus |
| US8451873B2 (en) * | 2010-02-11 | 2013-05-28 | Electro Scientific Industries, Inc. | Method and apparatus for reliably laser marking articles |
| CN103481692B (en) * | 2013-09-02 | 2016-08-17 | 武汉立德激光有限公司 | In the method that the film lower floor of compound film packing material carries out body laser inner carving marking anti-counterfeiting identification code |
| CN106425108B (en) * | 2016-09-06 | 2019-08-23 | 深圳华工激光设备有限公司 | The laser etching method and system of RFID label antenna |
| CN107138859B (en) * | 2017-05-24 | 2023-12-15 | 江苏华工激光科技有限公司 | Laser online marking method and device for packaging material with surface film |
| CN207223204U (en) * | 2017-10-12 | 2018-04-13 | 武汉雷恩博激光科技有限公司 | 3M flexible label paper laser marking machines |
| CN209716778U (en) * | 2019-01-24 | 2019-12-03 | 大族激光科技产业集团股份有限公司 | Laser processing device |
| CN109664026B (en) * | 2019-02-22 | 2021-03-30 | 陕西科技大学 | Laser marking method for small-size two-dimensional code on surface of aluminum alloy |
| CN109986212A (en) * | 2019-05-13 | 2019-07-09 | 大族激光科技产业集团股份有限公司 | A kind of laser color marking system and its method |
| CN210334771U (en) * | 2019-07-04 | 2020-04-17 | 大族激光科技产业集团股份有限公司 | Laser marking device |
| CN110315215A (en) * | 2019-08-01 | 2019-10-11 | 南理工泰兴智能制造研究院有限公司 | The laser on-line marking method and apparatus of packaging material for surface coating |
| CN111230320B (en) * | 2020-03-16 | 2022-05-17 | 深圳泰德激光技术股份有限公司 | Laser marking method for surface of anodic aluminum oxide |
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