In the automobile manufacturing process, body painting is one of the longest process and the most technically complex, and one of the most exhaustive parts of the three wastes. Driven by automotive and manufacturing regulations, reducing painting hazards, reducing coating costs, and improving coating quality have always been the subject of developments in coating technology. In the past ten years, the progress in terms of quality, environmental protection, and cost in new materials, new processes, and new technologies has been remarkable. In addition to the full application of environmentally friendly materials in the typical three-coat system coating process, revolutionary new processes and new technologies that were previously impossible to achieve are also applied or will be applied, which indicates that the automotive body painting technology will enter a new The period of development.
First, the four elements of automotive paint booth painting
Coating materials, coating processes, coating equipment, and coating management complement each other and promote the progress and development of coating processes and technologies. The 21st century is called the new century facing the environment. Environmental protection has received global attention and has become the most urgent research topic for mankind. The painting of automobiles and their parts is one of the most energy-intensive and three-waste parts in the automobile manufacturing process. Therefore, reducing the pollution of painting, reducing the cost of painting, and high coating quality have always been the subject of development of coating technology.
Second, the waste water generated by the paint booth of the automobile paint room pollutes nature.
In the past ten years, the progress of coating technology and equipment has been mainly reflected in the application of environmentally friendly coating materials, reducing the discharge of waste water and waste residue, reducing costs, and optimizing the automobile production process. Thanks to the advancement of coating materials, the design of the body coating system has also undergone revolutionary progress. Several typical new coating systems and new technologies have been or will be used in industrial production. China's current coating process and equipment are equivalent to the level of Europe and the United States 10 years ago, and some companies have adopted some new equipment at the international advanced level on the new coating line. Several new body painting processes.
Third, the car paint room http://coating process: reverse process technology, secondary electrophoresis process, integrated coating process, membrane technology
Reverse process: Spray the powder coating on the outer surface of the body, and then perform electrophoretic coating after hot melting, and then dry the powder/electrophoretic coating together. Using this process can reduce the amount of electrophoretic coating by about 60%, replace the electrophoretic primer and intermediate coating on the outer surface of the vehicle body with a powder coating with a thickness of 70 μm, and eliminate the intermediate coating and drying process, thereby saving material and energy costs. Reduce VOC emissions.
The second electrophoresis process: a two-coat electrophoretic material was used, and the second layer electrophoresis (35-40 μm) was used instead of the middle coating. The electrophoresis process has high stability and reliability, high pass rate, high material utilization rate, low equipment investment (no air conditioning system required), so it can save 48% of the cost, reduce the frequency of maintenance and the traditional intermediate paint slag and VOC. emission.
Integral coating process: the functional layer (15μm) with the same color as the topcoat is used instead of the middle coating. There is no need to dry between the functional layer and the topcoat, and the middle coating line is eliminated, which greatly reduces the VOC while improving production efficiency. Emissions.
4. Membrane technology is a pre-fabricated topcoat film suitable for thermoforming. The topcoat properties and appearance of the thermoformed product are very similar to those of conventional bake spray coatings. The technology is mainly applied to the production of plastic parts. The prefabricated composite coating film is formed by molding and molding the plastic parts together with the "insert molding" or "inner mold" process, and is integrated with the plastic parts to obtain a defect-free coating. Install the cover.
The body frame is manufactured by a traditional stamping and welding process. The painting shop only paints the body frame, and the top coat uses powder coating technology. Since the exposed area of ​​the body frame is small, the color of the top coat does not have to be the same as the cover, and each of the shades can be used. Large-area covers are plastic parts made by film coating technology, and there are thousands of colors. This greatly simplifies the body painting process, and reduces the coating cost while making the VOC emissions of the coating reach 7g/m2, which is far lower than the requirements of European emission regulations.
At present, automobile body painting in developed countries such as Europe and the United States is developing rapidly in popularizing and applying environmentally friendly materials. VOC emissions have been far lower than the most stringent regulatory requirements; coating automation, coating production efficiency and coating material utilization rate have been further improved; further reduction New technologies for coating costs and reduced emissions of three wastes have been born and are beginning to be applied; new technologies are no longer limited to improvements in traditional typical coating processes, and different alternative coating techniques have been applied or are about to be applied. The application of technology has a significant impact on the concept of the design and manufacture of traditional automotive bodies while simplifying the body coating process.
This is enough to show that the car body painting technology has begun to enter a new period of development, car body design and protective decoration will have more choices of technical concepts and complete manufacturing solutions. In addition to the relatively backward application of environmentally friendly materials, the typical body painting production technology currently used in China is not much different from that in Europe and America. Despite this, there is still a big gap in the research and development of coating materials and coating-related technologies in China. How to change this status quo is a common issue in painting and related industries.
PVC capillary Drainage Board is made of laminated soft rubber material, and the dense slot is opened on soft rubber plastic material. The slot hole is designed to be small inside and big outside and when you use it you should let the hole facing down. Using the principle of capillary water absorption, the water flow is poured from the bottom up to the capillary sink. The soil particles in the water will naturally precipitated by gravity, and the soil particles will not enter into the capillary water pipe, and will not generate siltation near the water channel. PVC Drain Board can produce excellent water absorption and drainage.
Product features
1. Non-blocking: use of natural gravity to separate soil and water;
2. High permeability property: 20% open hole rate has effective water absorption area;
3. High drainage efficiency: drainage board using capillary force to improve drainage efficiency;
4. Strong anti-earth pressure: arch bridge structure design, effective dispersion of stress distribution with self-cleaning function,
5. Convenient construction: the drum package will not take up the volume and reduce the transportation cost, storage, management, work cost
7. Flexibly: can be closely combined with the topography to form an infinite long, compressed highway;
8. Durability: Stoma Drainage Plate made from PVC high density polymerization material, so PVC drain board has the advantage of uv resistance and durable.
Product features
1. Non-blocking: use of natural gravity to separate soil and water;
2. High permeability property: 20% open hole rate has effective water absorption area;
3. High drainage efficiency: drainage board using capillary force to improve drainage efficiency;
4. Strong anti-earth pressure: arch bridge structure design, effective dispersion of stress distribution with self-cleaning function,
5. Convenient construction: the drum package will not take up the volume and reduce the transportation cost, storage, management, work cost
7. Flexibly: can be closely combined with the topography to form an infinite long, compressed highway;
8. Durability: Stoma drainage plate made from PVC high density polymerization material, so PVC drain board has the advantage of uv resistance and durable.
Golf course underground drainage and slope drainage, underground irrigation in arid regions, park or green space underground drainage, low wetland agriculture drainage, retaining wall and tunnel engineering field underground drainage, iron highway roadbed drainage and underground drainage, rainy season gardening landscape water supply and drainage, etc.
Basic construction specifications
In principle, the hole groove (absorbent surface) can be roughly downward, so that the soil particles can be settled by gravity to prevent blockage.
At least two percent of the embedding slope are recommended to generate siphon-age
Lay the bottom of the ditch to be leveled, compacted, then laid the wool and fine drainage belt.
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