WO2018205482A1

WO2018205482A1 - Filtering film processed using laser and laser processing system

Info

Publication number: WO2018205482A1
Application number: PCT/CN2017/103375
Authority: WO
Inventors: 陶沙; 赵晓杰
Original assignee: 英诺激光科技股份有限公司
Priority date: 2017-05-11
Filing date: 2017-09-26
Publication date: 2018-11-15
Also published as: CN106944751A

Abstract

Disclosed is a filtering film processed using a laser. A micropore array for filtering microparticles is distributed on the filtering film, the diameters of the micropores being 0.1 micrometer to 1 millimeter. Further disclosed is a laser processing system for processing the filtering film, the system comprising a laser device (1), a beam expanding device (2), a diffraction optical element (7), a galvanometer unit (3), a lens (4), an object carrying mechanism (5) and a corresponding control unit (6) provided in sequence. By means of the selection of laser processing parameters, with the aid of the galvanometer and the object carrying mechanism, a micropore array with pore diameters ranging from hundreds of nanometers to hundreds of micrometers can be manufactured on a filtering film made of a selected material. Said system can be used for processing the filtering film, being high in working efficiency, low in production cost and large in micropore density, and having no tool consumption and good filtering effect.

Description

Filter film and laser processing system using laser processing

Technical field

The invention belongs to the field of environmental protection, and relates to a filter film or a filter screen processed by laser and a laser processing system for processing the filter film or the 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 environmentally friendly enterprises, among which microfiltration technology and products, especially The demand for filtration membranes (nets) for filtering micron to nanoscale contaminants continues to increase. Microfiltration refers specifically to the removal of particulates, bacteria and other contaminants from gas-phase and liquid-phase suspensions. It is mainly achieved by membrane separation technology. The separation mechanism of the membrane is mainly sieve retention, and the solids with a size larger than the membrane pore size. Particles or particle aggregates can be widely used in wastewater, sewage treatment, food, pharmaceutical industry, desalination projects, air pollution control and other fields.

Especially in recent years, the fine particles in the air are seriously polluted, and the concentration of particulate matter (PM2.5) with aerodynamic equivalent diameter less than 2.5 microns in the environment is high, which seriously affects the air quality, compared with the coarser atmospheric particles. It has large area and strong activity, and it is easy to attach toxic and harmful substances such as heavy metals and microorganisms. It has a long residence time in the atmosphere and a long transportation distance, which has a great impact on human health and the atmospheric environment. However, the existing filter membrane processing device has a complicated structure and high production cost, and at the same time, the membrane material can filter fine particles.

Summary of the invention

In order to solve the above technical problems, the present invention proposes a laser processing system which can be used for filtering contaminated particles of different sizes (several hundred nanometers to several hundreds of micrometers) and a laser processing system for preparing filter holes.

The technical solution of the present invention is:

The present invention provides a filter membrane processed by laser, on which a microwell array for filtering microparticles is distributed, in which the micropores have a diameter of 0.1 μm to 1 mm.

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

Preferably, the pores have a pore diameter of not more than 2.5 μm.

The present invention also provides a laser processing system for processing the filter film, the processing system comprising a laser, a beam expander, a diffractive optical element, a galvanometer unit, a lens, a carrier mechanism, which are sequentially disposed along a laser light path, Also included is a control unit that is electrically coupled to the laser, galvanometer unit, and carrier mechanism.

Preferably, a CCD image sensor is further provided, the CCD image sensor being disposed adjacent to the galvanometer unit, the camera of the CCD image sensor being oriented toward a load plane of the carrier mechanism.

Preferably, the laser emits a laser beam having a wavelength of less than 2000 nm.

Preferably, the pulse width of the laser may be in the order of milliseconds, microseconds, nanoseconds, picoseconds or femtoseconds.

Preferably, the galvanometer unit comprises an X-Y galvanometer, an angle measuring sensor and a driving mechanism for driving the X-Y galvanometer to rotate;

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

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

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

(1) A laser-processed filter membrane according to the present invention, wherein the filter membrane is provided with a microwell array for filtering microparticles, and the micropore array has a diameter of 0.1 μm to 1 mm. It can filter contaminated particles of different sizes (several hundred nanometers to several hundred micrometers), and has a wide application range. When the prepared filter membrane (net) has a smaller pore diameter than the contaminated particles, the filter pores of the filter membrane are prepared by laser processing. The processing efficiency is high, the equipment itself has no loss, and the filter membrane with large pore density and quantity can be prepared, and the production cost is reduced, and the obtained filter membrane can be used as a mask or other filtering products as needed.

(2) The filter film processed by laser according to the present invention, the filter film is made of metal or non-metal, and the metal includes, but is not limited to, stainless steel, aluminum, and the non-metal includes, but not limited to, plastic. The filter membrane has a thickness of 1 micrometer to 2 millimeters, and the filter membrane has a wide selection of materials, and the filter membranes of different materials can be applied to different filtration occasions.

(3) A laser processing system for processing the filter film according to the present invention, comprising a laser, a beam expander, a diffractive optical element, a galvanometer unit, a lens, and a carrier mechanism which are sequentially disposed along a laser beam path, and further includes A control unit electrically coupled to the laser, the galvanometer unit, and the carrier mechanism. The system can monitor the laser drilling process in real time with high reliability, high processing efficiency and high precision, and is suitable for industrial mass production of filtration membranes.

DRAWINGS

In order to make the content of the present invention easier to understand, the present invention will be further described in detail below with reference to the accompanying drawings

1 is a schematic view showing the structure of a laser processing system according to a second embodiment of the present invention.

Reference numerals in the figures are denoted as: 1-laser; 2-expansion beam device; 3-galvanometer unit; 4-lens; 5-load mechanism; 6-control unit; 7-diffractive optical element.

detailed description

Example 1

The embodiment provides a filter membrane processed by laser, wherein the filter membrane is distributed with a micropore array for filtering microparticles of different particle sizes, wherein the micropore array has a diameter of 0.1 μm to 1 mm. Preferably, it is 2-500 μm. According to different requirements, the micropores can be processed into different pore diameters by laser processing. In the embodiment, the pore diameter of the micropores is preferably not more than 2.5 μm, which is suitable for filtering micro particles such as PM2.5. Its filtering effect is good, and it does not need to be superimposed on multiple layers when used. The material of the filter film may be metal or non-metal material, wherein the metal material may be selected from conventional materials such as stainless steel or aluminum, and the non-metal material may be selected from plastic. The thickness of the filter film is 1 micrometer to 2 millimeters, according to requirements. Choose a different thickness. As a transformable embodiment, the filter membrane may be a filter mesh having different aperture meshes made by laser, and may function as a filter particulate.

Example 2

The embodiment provides a laser processing system for processing the filter film (mesh), as shown in FIG. 1, comprising a laser 1 arranged sequentially along a laser beam path, and a beam expander 2 for changing a diameter of a laser beam. a diffractive optical element (DOE) 7, a galvanometer unit 3 for deflecting the laser beam, a lens 4 for focusing the laser beam, and a carrier mechanism 5 with the carrier plane of the carrier mechanism 5 facing the lens 4 The light exiting surface further includes a control unit 6 electrically connected to the laser 1, the galvanometer unit 3 and the carrier mechanism 4. The diffractive optical element 7 is disposed between the beam expanding device 2 and the galvanometer unit 3, and functions to diffract the laser beam into a plurality of parallel beams, and can simultaneously form a plurality of micropores on the filter film or directly form micropores. The array improves the efficiency of laser drilling.

The control unit 6 is a control terminal of a conventional computer, a mobile phone, etc.; the laser 1 is a semiconductor laser, and the laser beam emits a wavelength of 266-1064 nm; the beam expander 2 is a laser beam expander, and the beam expansion factor is 1-10 times, used to change the beam diameter and divergence angle of the laser beam to make the laser focusing effect better; the galvanometer unit 3 includes a set of XY galvanometers, which can be rotated in the X and Y directions, respectively. The laser beam is reflected to achieve a deflection effect on the laser, and the galvanometer is connected with an angle measuring sensor for measuring the deflection angle of the X and Y galvanometers and transmitting the measured information to the control unit 6, and further comprising driving the XY a drive mechanism for rotating the galvanometer, wherein the drive mechanism is a conventional servo motor; the lens 4 may be a plano-convex lens, a lenticular lens or a normal scanning lens to perform focusing on the laser beam; the carrier mechanism 5 For the XY axis moving platform, the movement of the workpiece to be perforated filter film can be driven in the X and Y directions under the control of the control unit 6.

Further, a CCD image sensor is further disposed, and the CCD image sensor is disposed adjacent to the galvanometer unit, and the camera of the image sensor faces the loading plane of the loading mechanism 5 to monitor the laser drilling process in real time.

The embodiment further provides a laser drilling system using the filter film (net) of the embodiment 1 for laser drilling, which comprises the following steps:

S1, using the control unit 6 to make a processing pattern, setting the aperture and hole spacing to be punched, and introducing the graphic information to the terminal of the laser 1;

S2, placing the filter film (mesh) workpiece to be processed on the load plane of the loading mechanism 5, setting the laser focus position and laser processing parameters, and setting the pulse width and power of the laser according to the thickness and material of the filter film (net). For the parameters such as the wavelength, the pulse width of the laser can be set to the millisecond, microsecond, nanosecond, picosecond or femtosecond level according to different filter membranes. In this embodiment, the filter membrane (net) is made of plastic material and has a thickness of 5 -60 μm;

S3, turning on the laser 1, performing laser drilling, simultaneously starting the CCD image sensor, real-time monitoring of the laser drilling process, and controlling the loading mechanism 5 to move in the X and Y directions during the laser drilling process, Punching is performed at different positions of the workpiece.

It is apparent that the above-described embodiments are merely illustrative of the examples, and are not intended to limit the embodiments. Other variations or modifications of the various forms may be made by those skilled in the art in light of the above description. There is no need and no way to exhaust all of the implementations. Obvious changes or variations resulting therefrom are still within the scope of the invention.

Claims

A filter membrane processed by laser, characterized in that a microporous array for filtering microparticles is distributed on the filter membrane, and the pores have a diameter of 0.1 μm to 1 mm.
The filter film processed by laser according to claim 1, wherein the filter film is made of metal or non-metal, and the metal includes, but is not limited to, stainless steel or aluminum; and the non-metal includes but is not limited to plastic. The filter has a thickness of from 1 micron to 2 mm.
The filter film processed by laser according to claim 2, wherein the pores have a pore diameter of not more than 2.5 μm.
A laser processing system for processing the filter membrane according to any one of claims 1 to 3, characterized in that the processing system comprises a laser, a beam expanding device, a diffractive optical element, a vibration, which are sequentially disposed along a laser beam path a mirror unit, a lens, and a carrier mechanism, wherein a load plane of the carrier mechanism faces a light exit surface of the lens, and further includes a control unit electrically connected to the laser, the galvanometer unit, and the load mechanism.
A laser processing system according to claim 4, further comprising a CCD image sensor, said CCD image sensor being disposed adjacent to said galvanometer unit, said camera of said CCD image sensor facing said carrier mechanism Load plane.
A laser processing system according to claim 5, wherein said laser emits a laser beam having a wavelength of less than 2000 nm.
The laser processing system of claim 6 wherein said laser has a pulse width in the order of milliseconds, microseconds, nanoseconds, picoseconds or femtoseconds.
The laser processing system according to claim 7, wherein said galvanometer unit comprises an X-Y galvanometer, an angle measuring sensor, and a driving mechanism that drives said X-Y galvanometer rotation.
The laser processing system of claim 8 wherein said carrier mechanism is an X-Y axis moving platform.
The laser processing system of claim 9 wherein said lens is a plano-convex lens, a lenticular lens or a flat field scanning lens.