A kind of preparation method of SMT template surface superhydrophobic structure

Abstract

The invention discloses a preparation method of a super-hydrophobic structure on the surface of an SMT template. The preparation method is characterized in that the focus of a picosecond optical fiber laser is focused on the surface of the SMT template so as to form a superfine structure on the surface of the SMT template, and the focus of a quasi-continuous optical fiber laser is focused on a first preset position above the surface of the SMT template to conduct processing on the SMT template. According to the preparation method of the super-hydrophobic structure on the surface of the SMT template, the superfine structure made through laser is applied to the field of SMT templates, the solder paste demoulding rate and the printing quality in the SMT template printing process are promoted, and meanwhile the made superfine structure is high in strength and high in friction resistance and corrosion resistance. Therefore, the production efficiency is improved, and the service life of printing templates is prolonged.

Description

technical field [0001] The invention relates to the field of making SMT templates, in particular to a method for preparing a superhydrophobic structure on the surface of an SMT template. Background technique [0002] The SMT printing process is one of the most front-end and most important processes in the SMT process. During the printing process, the SMT template has problems such as solder paste adhesion, low soldering rate, and frequent cleaning of the stencil, especially in the era of electronic products represented by smart phones. After the development of light and thin, and the widespread use of 01005 small devices and ultra-fine pitch devices, the corresponding printing template opening size is getting smaller and smaller, the problem of low soldering rate and insufficient solder paste during soldering is becoming more and more serious, which seriously affects Welding quality, increased stencil cleaning frequency and consumable costs, also reduces production efficienc...

AI Technical Summary

Problems solved by technology

[0002] The SMT printing process is one of the most front-end and most important processes in the SMT process. During the printing process, the SMT template has problems such as solder paste adhesion, low soldering rate, and frequent cleaning of the stencil, especially in the era of electronic products represented by smart phones. After the development of light and thin, and the widespread use of 01005 small devices and ultra-fine pitch devices, the corresponding printing template opening size is getting smaller and smaller, the problem of low soldering rate and insufficient solder paste during soldering is becoming more and more serious, which seriously affects Welding quality, which increases the frequency of stencil cleaning and the cost of consumables, also reduces productivity

[0003] There are two main methods to solve the above problems: the first is to use ultrasonic treatment, electrochemical polishing and other processes to remove burrs and reduce surface roughness, but the printing effect is still not good for small devices and ultra-fine pitches; the second is Increase the hydrophobicity of the surface of the steel sheet to increase the release rate, including two methods, the first is to coat the surface of the steel sheet with a nano-coating to reduce the surface energy, and the second is to make a microstructure on the surface of the steel sheet to increase the hydrophobicity. The traditional method It is made by chemical etching method, which has a certain effect, but due to its serious chemical pollution, it is harmful to the environment and operators, and the process is complex, the production structure is single and many parameters are uncontrollable, which seriously restricts its use effect

[0004] The rapid development of laser technology has brought new directions and technological breakthroughs to the fabrication of material surface microstructures. Laser fabrication of surface structures has the advantages of flexibility, high efficiency, and controllability. Although lasers currently fabricate hydrophobic structures on the surface of materials It has been realized, but for the SMT template field, due to the special requirements of its use, the surface hydrophobic structure simply made by the traditional method cannot be applied to the surface of the SMT template; specifically, the surface hydrophobic structure made by the traditional laser has poor friction resistance and can only be used It is used for places and items that are not moving, such as the surface of decorative materials, while SMT templates need to withstand high pressure and multiple times of repeated friction in the printing process. The structure causes huge corrosion, so if the traditional laser-made surface hydrophobic structure is simply applied to the surface of the SMT stainless steel template, it only needs to be printed once or twice, and the microstructure on the template surface will be destroyed by pressure. Therefore, the laser-made microstructure The application of hydrophobic technology to SMT templates and other fields that require repeated friction has been greatly limited

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