Micro-fluidic chip welding method

Abstract

The invention discloses a micro-fluidic chip welding method. The micro-fluidic chip comprises a welding fixture, a laser welding head, a moving platform for controlling the laser welding head to move,a micro-fluidic chip and a light-transmitting plate, the micro-fluidic chip and the light-transmitting plate are placed on the welding fixture respectively, and the micro-fluidic chip welding methodcomprises the following steps that the light-transmitting plate is plated with a layer of shading matter, and part of the shading matter is removed through laser marking; and a light-transmitting pathL2 consistent with a flow path L1 is formed on the light-transmitting plate; the micro-fluidic chip and a thin film are pressed by the welding fixture, the light-transmitting plate is irradiated by linear laser, the moving platform drives the laser welding head to move, and laser energy released by the laser welding head is absorbed and converted into heat energy by the micro-fluidic chip throughthe light-transmitting plate, so that a contact area between a micro-fluidic channel of the micro-fluidic chip and the thin film is melted to form a welding seam; and laser welding of the micro-fluidic chip and the film is completed. According to the micro-fluidic chip welding method, micro-fluidic channel welding with the width of 0.1 mm can be achieved; and welding can be completed through one-time scanning by adopting the line light source, and the welding efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of laser welding, in particular to a microfluidic chip welding method. Background technique [0002] Generally, the trajectory of the micro-channel is relatively complex and relatively thin. During welding, on the one hand, it is necessary to control the trajectory of laser welding, and it is difficult to control the finer laser trajectory. For example, if the difference is 0.1mm or 0.2mm , it is more difficult to control; on the other hand, if the weld is very thin (narrow width), the welding position is also very thin. That is to require that the spot be controlled to be very small, and then the control of the spot is small, which will lead to the concentration of laser energy and burn out the product; in addition, for this very narrow weld, the beam emitted by the laser will have a thermal effect, which will cause Affects the material next to the weld, making the product unsightly. [0003] Therefore, t...

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Problems solved by technology

[0006] 3) The thermal effect of the beam will heat the position of the non-welding rib, affecting the material next to the weld, and the appearance of the product is not beautiful;

[0007] Chinese Patent Document No. CN110077000A discloses a welding device and method for micro-channel transparent plastics on 2019.08.02. The method includes the following steps: placing the first micro-channel transparent plastic and the second micro-channel transparent plastic in the profiling cavity Middle; Start the clamp, reduce the height of the transparent glass medium, so that the transparent glass medium is fixedly clamped with the first microchannel transparent plastic and the second microchannel transparent plastic; start the laser, and the first microchannel transparent plastic and the second microchannel transparent plastic The micro-channel of the second micro-channel transparent plastic is used for transmission welding. This method achieves the technical effect of welding without applying light absorbing agent. The walking trajectory is consistent with the path of the microfluidic channel

[0008] Based on the above, the above welding method needs to be further improved for welding products with complex microchannel paths, small path widths, and thin product welding thicknesses.

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