The traditional cleaning industry has a variety of cleaning methods, mostly using chemical agents and mechanical methods for cleaning.
Under the increasingly stringent environmental protection regulations in China, and people’s growing awareness of environmental protection and safety, the types of chemicals that can be used in industrial production and cleaning will become less and less.
How to find a cleaner and non-invasive cleaning method is a problem we have to consider.
Laser cleaning is characterized by non-abrasive, non-contact, non-thermal effects and objects suitable for various materials, and is considered to be the most reliable and most effective solution. At the same time, laser cleaning can solve problems that cannot be solved using traditional cleaning methods.
二. The physical principle of laser cleaning
The beam emitted by the laser is absorbed by the contaminant layer on the surface to be treated. Absorption of large energy forms a rapidly expanding plasma (highly ionized unstable gas), generating shock waves. The shock wave turns the contaminants into pieces and is rejected.
Compared with traditional cleaning methods such as mechanical friction cleaning, chemical corrosion cleaning, liquid solid strong impact cleaning, and high-frequency ultrasonic cleaning, laser cleaning has obvious five advantages:
Environmental Advantages: Laser cleaning is a "green" cleaning method. It does not require the use of any chemicals or cleaning fluids. The cleaned waste is basically solid powder, small in size, easy to store, recyclable, no photochemical reaction, no It will produce pollution. Can easily solve the environmental problems caused by chemical cleaning. An exhaust fan can often solve the problem of waste generated by cleaning.
Advantageous Effect: The traditional cleaning method is often contact cleaning, which has mechanical force on the surface of the cleaning object. The surface of the damaged object or the cleaning medium adheres to the surface of the object to be cleaned, cannot be removed, and secondary pollution occurs. Laser cleaning is not available. Grinding and non-contact, non-thermal effects do not damage the substrate and these problems are solved.
Control advantages: The laser can be transmitted through the optical fiber, cooperate with the robot hand and the robot to easily achieve long-distance operation, and can clean the parts that are not easily reached by traditional methods. This can be used in some dangerous places to ensure the safety of personnel.
Convenient advantages: Laser cleaning can remove various types of contaminants on the surface of various materials and achieve cleanliness that cannot be achieved by conventional cleaning. It is also possible to selectively clean the surface of the material without damaging the surface of the material.
Cost advantages: Laser cleaning speed, high efficiency, save time; purchase of laser cleaning system Although the initial one-time investment is higher, but the cleaning system can be used for a long period of time, the operating cost is low, and more importantly, it can be easily automated. Costing: A single cleaning efficiency of 8 square meters per hour running costs about 5 degrees of electricity, that is cleaning costs 4 cents per square meter, in addition to the initial cost, the late 4 cents per square meter.
三. Laser cleaning used in various fields
Laser cleaning technology is a new type of cleaning technology that has been rapidly developed in the past 10 years. It has gradually replaced traditional cleaning processes in many fields with its own advantages and irreplaceability. Laser cleaning can be used not only to clean organic contaminants, but also to clean inorganic materials, including metal corrosion, metal particles, and dust. The following describes some practical applications. These technologies have been very mature and have been widely used.
1. Mold laser cleaning
2. Weapons and equipment laser cleaning
3. Aircraft old paint laser cleaning
4. Exterior wall laser cleaning
5. Laser cleaning machine in the electronics industry
6. Precise deesterification laser cleaning in the precision instrument industry
7. Nuclear power plant reactor pipe laser cleaning
In summary, laser cleaning plays an important role in many fields, such as automobile manufacturing, semiconductor wafer cleaning, precision parts processing and manufacturing, military equipment cleaning, building exterior wall cleaning, cultural relics protection, circuit board cleaning, and precision parts. Processing, manufacturing, liquid crystal display cleaning, chewing gum remnants and other areas can play an important role.
The application of laser cleaning in defense military equipment: such as various aircraft stripping and rust removal, various ship equipment, various weapons and equipment rust removal, all kinds of tank artillery rust, all kinds of parts rust, etc. There is great potential for development. In particular, laser cleaning has obvious advantages such as environmental protection, convenience, safety, and low-cost use, and is a new, efficient, and safe process technology.