The furniture is widely used in the production of furniture to paint the furniture. The spraying process has high production efficiency, and the formed paint film is even and delicate, smooth and high in adhesion. However, the paint that was atomized by the high-pressure air during the spraying process formed a large amount of paint mist. The paint mist is composed of paint particles and a solvent, and the paint mist has a small specific gravity and floats in the air. The sedimentation of the paint mist on the surface of the workpiece will affect the quality of the workpiece, and the operator's inhalation of the paint mist will also endanger the health of the body. Many furniture manufacturers use water curtain spray booths to remove paint mist and improve the spray construction environment.
Water curtain spray booth single curtain or double curtain
The water curtain spray booth (hereinafter referred to as the water curtain machine) used to be a single curtain type. After the sprayed air is atomized by the compressed air, it is sprayed from the spray gun to the surface of the workpiece. The excess paint mist flows under the negative pressure of the water curtain machine to the exhaust port below the water curtain plate, and the air flow in the entire spray area flows obliquely downward. Air port. Woodworking machinery manufacturers have designed the water curtain panel as a double curtain in consideration of the better airflow in the spray environment and the size of the water curtain plate limited by the width of the stainless steel plate. There is no essential change in the single curtain type and the double curtain type. The double curtain type adds an exhaust port in the middle of the water curtain plate, and the middle exhaust port forms a parallel flow of the air flow by the flow of the paint mist generated from the spray gun to the exhaust port. The air flow is advantageous for spraying a large-area workpiece in the horizontal direction, which can reduce the interference of the paint mist on the sprayed workpiece and improve the quality of the paint film.
What are the disadvantages of the water curtain spray booth?
Some shortages of a product are inevitable, as is the water curtain machine. Its biggest drawback is that the humidity is high during operation. Since water is used as the adsorbent for the paint mist, in order to improve the adsorption performance, the water must be circulated at a high speed, and the air containing the paint mist is sprayed and cleaned. A large amount of water is sprayed and volatilized in the water curtain machine to make the humidity of the spray booth improve. We all know that many coatings in furniture painting are not suitable for construction in high humidity environments. High humidity will affect the quality of the film and the speed of drying. A series of measures such as increasing the amount of exhaust air and delivering enough dry and clean air are generally used to reduce the humidity in the painting environment.
Some countries do not use water curtains, which are mainly related to the environmental protection laws of the area. Some countries consider the difficulty of water pollution treatment, so many regulations strictly control the discharge of sewage, and do not allow the sewage of the water curtain machine to be discharged without treatment. Therefore, furniture companies often avoid regulations and adopt dry filtration to absorb paint mist. . According to our current situation, the amount of sewage generated by the water curtain machine is relatively small. When the paint residue in the sewage is filtered, the impact of the discharge on the environment is still relatively small. After the water curtain machine adsorbs the solvent and paint in the air, it is an improvement over the original discharge.
Although there are some shortcomings in the water curtain machine, it has many advantages: the investment is low, the price of a water curtain machine with a working surface of 3 meters is only about 10,000 yuan; the operating cost is low, the water circulation is repeatedly washed, and the cost of the paint mist is absorbed. Very low; the treatment effect is good. If the water curtain machine is adjusted very well, the treatment efficiency can reach more than 85%. Because the water curtain machine has the above characteristics, it will not be eliminated in a relatively long period of time.
What should I pay attention to when choosing a water curtain spray booth?
There are two types of water curtain machines that are common today: a spray booth type with a grille and a tuyere type without a grille. The water curtain machine with the ground grid consists of a side plate, a ground grid and a top plate on both sides to form a relatively complete construction environment. When the paint is applied, the workpiece is sent to the painting station, and then removed after the spraying is completed. The water curtain machine without the ground grille is generally a direct pass type of product, that is, the product is moved to the water curtain machine before the process, and then flows to the next process after spraying, which is very suitable for production in the form of a line, but the paint mist is discharged. The effect is not as good as the former one.
The water curtain of the water curtain machine is a relatively key component. The component always works in water and is easily rusted and corroded. Therefore, the water curtain plate should be made of stainless steel. The commonly used stainless steel plate is 304, and some equipment manufacturers use it to reduce costs. The stainless steel is made of 430 water curtain plates, and the price of stainless steel 430 is 2/3 of stainless steel 304. This kind of water curtain plate will not be used for a long time. In addition, the shape and manufacturing process of the water curtain plate are also very particular. The water curtain plate with the correct shape can make the water flow on the whole water curtain plate flow smoothly. There is no dry area, no water flow beats, and the water curtain plate is most taboo is water flow splash. Splashing water droplets splash on the workpiece to form a flaw, which directly affects the quality of the product.
Although the structure of the water curtain machine is simple, in order to ensure the normal operation and service life of the equipment, the material used for the water curtain machine should also meet the specifications. Some equipment manufacturers do not consider the interests of users very freely. The material thickness of the side panel steel plate of the water curtain machine should be above 1.2mm. The rigidity of the steel plate is too thin, the vibration is easy to occur during operation, and the working noise is relatively large. Since the water tank of the water curtain machine is always full of water, the volume of the water tank itself is large. In order to ensure the service life and work stability, the thickness of the water tank steel plate should be 2.5mm or more. If the water tank can be made of stainless steel, it is more ideal. .
The light color, brightness and light source position of the illumination source of the water curtain machine should conform to the application habits of the enterprise and the specific requirements of the sprayed product.
At present, the water curtain machine sold on the market does not meet the safety requirements for fireproof and explosion-proof. For the water curtain machine with fireproof and explosion-proof requirements, the manufacturer shall declare to the supplier when ordering, so that the manufacturer can illuminate and control the electric appliance in the water curtain machine. Wiring, motor and other aspects are configured according to the requirements of fire and explosion protection, of course, the price of the product is more expensive.
How to make the water curtain spray booth use better
The water curtain machine is a device that forcibly discharges the exhaust gas during spraying. The water curtain machine has no purification effect on the environment of the painting workshop. In order to improve the quality of the spray, the cleaning work of the spray shop must be done. When the curtain machine is running, it introduces a negative pressure in the spraying area, and the airflow of the whole environment flows to the water curtain machine, so the fresh air to be supplemented should be filtered. There are many types of filter materials, such as filter cloth, natural plant fiber, non-woven fabric, foam plastic, and the like.
For filter materials, we must consider the filtration efficiency, the size of the filter material, the regeneration of the filter material and the cost of use. The area of ​​the filtered air inlet to supplement the fresh air should not be too small. The air inlet area can be calculated according to the exhaust air volume, and the wind speed should not exceed 2m/s. The filter material for the air inlet should be regenerated or replaced at regular intervals and implemented to the person. When the filter material of the port is saturated, the filter purification function is lost.
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