Technical Development of Dry-type Mist Spray Painting Room

Spray paint production, the most daunting is the removal of spray mist, it (including lacquer and organic solvents, thinners and other benzene harmful substances), not only a waste of material, and if not handled, that damage the surface paint Membrane quality, and at the same time, contaminate the health of operators and people around them.

Overspray mist collection processing, generally using filter adsorption separation technology. Specifically divided into wet and dry two.

The most common wet method is the water (oil) curtain adsorption separation method. Among them, the curtain spray booth is the earliest and the most widely used. Whether it is an early long curtain or a recent multi-stage curtain, the humidity of the painting space is inconsistent with the humidity requirement of the painting environment due to the water. Sometimes water ( Oil splashes directly impair the quality of the paint film. The post-pollution and related equipment cleaning and repair are even more dirty and tired. From the production cost, the equipment investment is large, and the operating cost is high. For example, a 3m wide and 2.5m high water curtain spray booth requires about 20,000 yuan for pumps, pipes, and sink related equipment, and the pump is equipped with a motor of 4.5kw for 1 hour consumption. 4.5 electricity costs 3 yuan. It is also difficult to avoid the noise generated by water curtains. Due to wet equipment cleaning and maintenance costs are also greater.

Because of this, while improving the equipment for wet adsorption and separation of paint and fog, dry filter adsorption technology has emerged. One of the earliest applied methods was to improve on the basis of the paint curtain spray booth, that is, the use of a door-shaped steel plate overlapped and placed several times like a curtain board, it is not difficult to imagine the light * change the direction of the air flow and make the paint fog The lacquer fogging efficiency on the wall is not enough. For this reason, a fiber filter mat is added at the back. The effect of this dry spray paint room is not bad, which overcomes the main disadvantage of the wet type. However, due to the need to consider the cleaning of laminated paint and the replacement of the fiber mat, a maintenance channel and an inspection door must be provided between the two, so its floor space is more than double the original wet type. There are also more materials for the equipment and the same amount of cleaning and maintenance work. In addition, we have also seen in some intermittent spray production stations that the fiber filter mats are placed in front of the stacks. This eliminates the need for access channels and reduces the amount of cleaning work required to paint the stacks. The effect of using a viscous lacquer will quickly clog the fiber surface. Although this fiber pad is not costly, it is not suitable for use in the assembly line because it is replaced too frequently.

In recent years, with the development of spray equipment technology at home and abroad, there have been new developments in this area. With the strengthening of human environmental awareness, higher requirements have been put on the treatment of overspray mist in painting production. In order to catch up with the pace of the times, while learning to absorb the domestic and foreign coating equipment technology, combined with the national conditions developed a composite pleated maze board paint mist absorption separator, its creativity is to absorb the separation efficiency and materials The long-term durability, while considering it applies to the original wet or dry air paint removal system, the original ventilation system does not change, just use this to replace the water (oil) curtain or fiber filter mat part. The separator is made of special composite corrugated paper, punched and bonded to form a V-shaped labyrinth pleated cardboard, and then assembled with a metal frame plate to form an efficient paint mist separator.

The principle of the paint mist separator is the special design and distribution of holes in each V-shaped labyrinth so that the air flow produces the effect of the Venturi cyclone. The varnish paint liquid that has been sprayed is stopped and accumulated on the V-shaped wall of the labyrinth.

Efficient separation results from this Venturi effect, which is the combined use of paint inertia in paint fog and local changes in the velocity and direction of the air flow in the labyrinth. The reason why this type of labyrinth separator is used for a long time is mainly the shape of each labyrinth. The cavity can provide enough space for paint accumulation, concentration and separation. Its separation effect on the paint mist is greater than any of wet or dry filtration, and the service life can be more than 5 times that of the fiber mesh, and the separation efficiency can reach 98%.

The application of this composite pleated labyrinth paperboard to separate and spray paint spray technology makes the design of the paint booth more cost-effective. The V-shaped labyrinth adsorption separation tank can be placed upright and rich in rigidity. After careful design by the author, installation and replacement are very convenient. The V-shaped pleated maze board can be folded like an accordion and is easy to post, handle, store, and will naturally deploy during installation. Compared with other large-volume filter mats, it is more convenient to operate. The operating cost is lower than that of the water curtain pump of similar water curtain spray booths. It also saves the material cost of water and paint fogging agents.

The DN-210 series composite pleated maze board separator developed by the author at the end of 1997 was H680, each of which was developed as B840. Place it in the partitioning grid, and use the stop bar to position it up and down. Use the packing tape at the two interfaces to stick.

After using for a period of time, if it is found that the front plate of the V-shaped cardboard is plugged with paint, this piece should be replaced. When replacing, just remove the upper and lower stopper nuts and take the stopper and tear them. Tape, pull it down with a hook and put new cardboard on the line. Generally, it does not need to be completely replaced, and it is more economical to replace it in places where there is a lot of fog.

From the perspective of promotion and application, it is indeed a green product and is greatly welcomed by users.

The successful development of the paint sprayer's latest process material, the composite pleated labyrinth paperboard separator, is indeed a boon for the paint design work. Domestic production, cheap, its application than the water (oil) curtain in addition to paint fog and fiber filter in addition to paint mist is really provincial and good. Can be used for water (oil) curtain and fiber filter in addition to the paint spray room renovation, can also be used to improve the curtain spray room. It is applicable, convenient, economical, and affordable.