CN106944751A - A kind of filter membrane and laser-processing system using Laser Processing - Google Patents

Abstract

The invention discloses a filter membrane processed by laser, which can be used to filter pollution particles with different sizes ranging from hundreds of nanometers to hundreds of microns. It has a wide range of applications, and it is better when the pore size of the filter membrane obtained by laser processing is smaller than the pollution particles; a laser processing system for processing the filter membrane is also disclosed, which includes sequentially arranged lasers, beam expanders, diffraction Optical components, vibrating mirror unit, lens, object-carrying mechanism and corresponding control unit. Through the selection of laser processing parameters, supplemented by vibrating mirrors and object-carrying mechanisms, micropore arrays with pore diameters ranging from hundreds of nanometers to hundreds of microns can be made on the filter membranes of selected materials. This system can be used to process filter membranes (net), which has high working efficiency, low production cost, no tool loss, high pore density, and good filtering effect.

Description

A filter membrane processed by laser and laser processing system

technical field

The invention belongs to the field of environmental protection, and relates to a filter film or filter net processed by laser and a laser processing system for processing the filter film or filter net.

Background technique

In recent years, global air pollution and water pollution have become more and more serious. In order to alleviate the adverse effects of gas or liquid pollutants on people, filtration technology has been valued and developed by researchers and environmental protection enterprises. Among them, microfiltration technology and products, especially energy The demand for filter membranes (nets) for filtering micron to nanoscale pollutants is increasing. Microfiltration specifically refers to the method of intercepting particles, bacteria and other pollutants from the gas phase and liquid phase suspension, which is mainly realized by membrane separation technology. Particle or particle aggregate interception can be widely used in wastewater, sewage treatment, food, pharmaceutical industry, seawater desalination engineering, air pollution control and other fields.

Especially in recent years, the pollution of fine particulate matter in the air has been serious, and the concentration of particulate matter (PM2.5) with an aerodynamic equivalent diameter of less than 2.5 microns in the environment has remained high, seriously affecting air quality. Compared with coarser atmospheric particles, its Large area, strong activity, easy to attach toxic and harmful substances such as heavy metals and microorganisms, which stay in the atmosphere for a long time and transport distance, which has a great impact on human health and the atmospheric environment. However, the structure of the existing filter membrane processing device is relatively complicated, the production cost is high, and the particles that can be filtered by the membrane material are very limited.

Contents of the invention

In order to solve the above technical problems, the present invention proposes a filter membrane (net) processed by laser that can be used to filter pollution particles of different sizes (hundreds of nanometers to hundreds of microns) and a laser processing system for preparing filter holes.

Technical scheme of the present invention is:

The invention provides a filter membrane processed by laser. A micropore array for filtering microparticles is distributed on the filter membrane. In the micropore array, the diameter of the micropore is 0.1 micron-1 mm.

Preferably, the filter membrane is made of metal or non-metal, the metal includes but not limited to stainless steel and aluminum, and the non-metal includes but not limited to plastic; the thickness of the filter membrane is 1 micron to 2 mm.

Preferably, the diameter of the micropores is not greater than 2.5 μm.

The present invention also provides a laser processing system for processing the filter film, the processing system includes a laser, a beam expander, a diffractive optical element, a vibrating mirror unit, a lens, and an object-carrying mechanism arranged sequentially along the laser optical path, It also includes a control unit electrically connected with the laser, the vibrating mirror unit and the object-carrying mechanism.

Preferably, a CCD image sensor is further included, the CCD image sensor is arranged adjacent to the vibrating mirror unit, and the camera of the CCD image sensor faces the object-carrying plane of the object-carrying mechanism.

Preferably, the wavelength of the laser beam emitted by the laser is less than 2000nm.

Preferably, the pulse width of the laser can be at millisecond, microsecond, nanosecond, picosecond or femtosecond level.

Preferably, the vibrating mirror unit includes an X-Y vibrating mirror, an angle measurement sensor, and a driving mechanism for driving the X-Y vibrating mirror to rotate;

Preferably, the loading mechanism is an X-Y axis moving platform.

Preferably, the lens may be a plano-convex lens, a double-convex lens or a flat-field scanning lens.

The above technical solution of the present invention has the following advantages compared with the prior art:

(1) The filter membrane processed by laser according to the present invention, the filter membrane is distributed with a micropore array for filtering microparticles, and in the micropore array, the diameter of the micropore is 0.1 micron-1 mm. It can filter pollution particles of different sizes (hundreds of nanometers to hundreds of microns), and has a wide range of applications. When the filter membrane (mesh) pore size is smaller than the pollution particles, the effect is better; at the same time, the filter holes of the filter membrane are made by laser processing. , high processing efficiency, no loss of equipment itself, can prepare filter membranes with large pore density and large quantity, which reduces production costs, and the prepared filter membranes can be used as masks or other filter products according to needs.

(2) The filter membrane utilizing laser processing according to the present invention, the material of the filter membrane is metal or non-metal, the metal includes but not limited to stainless steel, aluminum, the non-metal includes but not limited to plastic, the The thickness of the filter membrane is 1 micron-2 mm, and the material of the filter membrane is widely selected, and filter membranes of different materials can be applied to different filter occasions.

(3) The laser processing system for processing the filter film according to the present invention includes a laser, a beam expander, a diffractive optical element, a vibrating mirror unit, a lens, and an object-carrying mechanism arranged sequentially along the laser light path, and also includes A control unit electrically connected with the laser, the vibrating mirror unit and the object-carrying mechanism. The system can monitor the laser drilling process in real time, has high reliability, high processing efficiency and precision, and is suitable for industrial mass production of filter membranes.

Description of drawings

In order to make the content of the present invention more easily understood, the present invention will be described in further detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein

FIG. 1 is a schematic structural diagram of a laser processing system according to Embodiment 2 of the present invention.

The reference numerals in the figure are represented as: 1-laser; 2-beam expander; 3-galvanometer unit; 4-lens; 5-object-carrying mechanism; 6-control unit; 7-diffractive optical element.

detailed description

Example 1

This embodiment provides a filter membrane processed by laser, on which a micropore array for filtering microparticles of different particle sizes is distributed, and in the micropore array, the diameter of the micropore is 0.1 μm-1 mm, It is preferably 2-500 μm. According to different requirements, the micropores can be laser-processed into different apertures. In this embodiment, the aperture of the micropores is preferably not greater than 2.5 μm, which is suitable for filtering PM2.5 and other micro particles. Its filtering effect is good, and it does not need to be stacked in multiple layers when used. The material of the filter membrane can be metal or non-metal material, wherein the metal material can be selected as conventional materials such as stainless steel or aluminum, and the non-metal material can be selected from plastic. Choose from different thicknesses. As an alternative embodiment, the filter membrane may also be a filter screen with different apertures made by laser, and it only needs to play the role of filtering particles.

Example 2

The present embodiment provides a kind of laser processing system for processing described filter membrane (net), and it as shown in Figure 1, comprises the laser device 1 that is arranged sequentially along the laser light path, is used to change the beam expander 2 of laser beam diameter , a diffractive optical element (DOE) 7, a galvanometer unit 3 for deflecting the laser beam, a lens 4 for focusing the laser beam, and an object-carrying mechanism 5, the object-carrying plane of the object-carrying mechanism 5 faces the lens 4 The light output surface of the laser beam also includes a control unit 6 electrically connected to the laser 1 , the vibrating mirror unit 3 and the object-carrying mechanism 4 . The diffractive optical element 7 is arranged between the beam expander 2 and the vibrating mirror unit 3, and plays the role of diffracting the laser beam into multiple parallel beams, and can simultaneously form multiple micropores on the filter film or directly form micropores array, improving the efficiency of laser drilling.

Wherein, the control unit 6 is a conventional computer, mobile phone and other control terminals; the laser 1 is a semiconductor laser, and the wavelength of the laser beam it sends is 266-1064nm; the beam expander 2 is a laser beam expander, and its beam expansion factor is 1-10 times, used to change the beam diameter and divergence angle of the laser beam, so that the laser focusing effect is better; the galvanometer unit 3 includes a set of X-Y galvanometers, and this set of lenses can be rotated in the directions of the X and Y axes respectively. Reflect the laser beam to realize the deflection effect of the laser. The galvanometer is connected with an angle measurement sensor, which is used to measure the deflection angle of the X and Y galvanometers and transmit the measured information to the control unit 6. It also includes driving the X-Y The driving mechanism for the galvanometer to rotate, the driving mechanism is a conventional servo motor; the lens 4 can adopt a plano-convex lens, a double-convex lens or an ordinary scanning lens, which can focus the laser beam; the object-carrying mechanism 5 It is an X-Y axis moving platform, which can drive the filter membrane workpiece to be perforated to move along the X and Y directions under the control of the control unit 6 .

Furthermore, a CCD image sensor is also included, and the CCD image sensor is arranged adjacent to the galvanometer unit, and the camera of the image sensor faces the object-carrying plane of the object-carrying mechanism 5 to monitor the laser drilling process in real time.

This embodiment also provides a method for laser drilling using the laser processing system of the filter membrane (net) described in Embodiment 1, which includes the following steps:

S1, use the control unit 6 to make processing graphics, set the aperture and hole spacing to be punched, and import the graphic information to the laser 1 terminal;

S2, place the filter film (net) workpiece to be processed on the loading plane of the loading mechanism 5, set the laser focus position and laser processing parameters, and set the pulse width, power, Wavelength and other parameters, the pulse width of the laser can be set to milliseconds, microseconds, nanoseconds, picoseconds or femtoseconds according to the different filter membranes. In this embodiment, the filter membrane (net) is made of plastic with a thickness of 5 -60μm;

S3, turn on the laser device 1, perform laser drilling, and start the CCD image sensor at the same time, monitor the laser drilling process in real time throughout the whole process, and control the movement of the loading mechanism 5 in the X and Y axis directions during the laser drilling process, so as to Different positions of the workpiece are drilled.

Apparently, the above-mentioned embodiments are only examples for clear description, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And the obvious changes or changes derived therefrom are still within the scope of protection of the present invention.

Claims (10)

1. a kind of filter membrane using Laser Processing, it is characterised in that be distributed with the filter membrane for filtering microparticle In microwell array, the microwell array, a diameter of 0.1 micron -1 millimeter of micropore.

2. the filter membrane according to claim 1 using Laser Processing, it is characterised in that the material of the filter membrane is gold Category is nonmetallic, and the metal includes but is not limited to stainless steel, aluminium；The nonmetallic including but not limited to plastics, the filtering The thickness of net is 1 micron -2 millimeters.

3. the filter membrane according to claim 2 using Laser Processing, it is characterised in that the aperture of the micropore is not more than 2.5μm。

4. a kind of laser-processing system for being used to process the filter membrane described in claim any one of 1-3, it is characterised in that described System of processing include be sequentially arranged along laser optical path laser, expand device, diffraction optical element, galvanometer unit, lens, load Thing mechanism, the loading plane of the loading mechanism towards the lens exiting surface, also including with the laser, galvanometer unit The control unit electrically connected with loading mechanism.

5. laser-processing system according to claim 4, it is characterised in that also including ccd image sensor, the CCD Imaging sensor is disposed adjacent with the galvanometer unit, and the camera of the ccd image sensor is towards the loading mechanism Loading plane.

6. laser-processing system according to claim 5, it is characterised in that the laser beam wavelength that the laser is sent is small In 2000nm.

7. laser-processing system according to claim 6, it is characterised in that the pulsewidth of the laser can for millisecond, microsecond, Nanosecond, psec or femtosecond rank.

8. laser-processing system according to claim 7, it is characterised in that the galvanometer unit includes X-Y galvanometers, angle Measurement sensor and the drive mechanism for driving the X-Y galvanometers to rotate.

9. laser-processing system according to claim 8, it is characterised in that the loading mechanism is X-Y axle mobile platforms.

10. laser-processing system according to claim 9, it is characterised in that the lens can be planoconvex spotlight, biconvex Lens or flat field scanning lens.