How to solve the problem of painting wooden furniture with "oil-to-water" (I)

In wood furniture coating, due to the speciality of water-based paint raw materials, formulation design and construction, the requirements for coating operations are higher. How to solve the "oil-to-water" transformation of furniture parts spraying problem, today we discuss this topic.
"spraying" is the process of coating system construction operation of paint

. The spraying system carries the functions of coating transport and atomization, and is the key equipment to present the protection, decoration, corrosion protection (protection) and isolation of the coating to the surface of the work piece. Water-like wood paint to get a good effect on the presentation, it is necessary to choose a suitable spraying system, of which the choice of spray gun is particularly important. The conventional spray system consists of a gun section and a paint delivery system section.
the first part: spray gun
spray gun according to the pressure of work can be classified into two categories: low-pressure gun, high-pressure gun.
low-pressure gun, according to the paint supply mode can be divided into: gravity type, upper suction type, pressure delivery type, according to the paint atomization pressure size can be divided into: HVLP (LP) gun (low pressure), environmental spray gun (medium pressure), traditional gun (high pressure).
: Air-free and air-assisted spray guns can be divided.
the second part: paint transport
How to choose a set of water-based wood paint work, but also in line with the actual needs of production of "good" spraying system? We can consider the following factors.
01 The hardware factors of the spray system
When selecting the spray system equipment, consideration should be given to:
is robust, wear-resistant and durable, reducing the replacement cycle of the equipment and fragile parts.
construction is lightweight and suitable for coating operation, and the operator is easy to hold, light weight, easy to operate and easy to maintain.
supply of spare parts is adequate, accessories market share is large, easy to purchase.
to meet the spraying operation flow requirements: 1, spray gun caliber selection, that is, the amount of paint to be sprayed per minute. (General water-based wood paint requires a flow of about 200mL/Min); 2, the power size of the conveyor system selection, that is, to several spray guns to work properly.
02 spray system efficiency and atomization effect
the choice of spray transmission efficiency is high, the finer the atomized particles spray gun. Reduce paint waste, which is conducive to wet coating film leveling. The higher the paint rate, the less waste of paint, the less environmental pollution around. We know that the gun is the use of compressed air atomization coating, when the atomization effect meets the coating requirements, the greater the air pressure at the gun cap, spray overspray (paint spray splash) the more obvious, the lower the transmission efficiency. The following list of several different spray gun normal atomization pressure parameters compared to the following:
in practical application, spray gun according to the paint transmission efficiency and atomization effect selection reference is as follows:
from the table above, the traditional spray gun atomization of good paint required air pressure is very large, transmission efficiency is low and paint oversputtering serious, effective paint utilization rate can only reach about 35%, the paint itself waste is not in line with energy conservation and emission reduction, reduce waste environmental protection requirements. In order to improve the efficient utilization rate of coatings, reduce the pressure of waste disposal and discharge, improve the operating environment of operators, it is recommended to avoid the choice and use of such spray guns. On the contrary, the advantages of the high-pressure auxiliary spray gun indicators are obvious, suitable for spraying high viscosity coating, that is, can reduce the amount of paint solvent added, shorten the wet film drying time, but also can reduce the overspray phenomenon, improve the flatness of the product paint, reduce the burden of the post-staff grinding ground work, to meet the needs of environmental protection coating.
of coating: according to the requirements of the furniture work parts coating section.
mainly from the transmission paint type, efficiency, transmission distance, operating objects for the selection of reference basis, the reference comparison is as follows:
low-pressure system cleaning convenience, more suitable for a small number of diverse, spray colored paint, two-liquid or three-liquid type of paint.
high-pressure system transmission efficiency, because of its cleaning more troublesome, cleaning is not in place easy to clog the system. Therefore, it is not recommended to use in long-distance transport of colored paint, two-liquid or three-liquid paint.
03 coating system is suitable for the paint viscosity range
different spray equipment, the system has its most suitable viscosity range. In order to achieve better paint coating effect of furniture, we can further optimize the subdivision of the spray system according to the required coating viscosity, to meet the specific requirements of the spraying operation link in the furniture coating process. Spraying equipment matching and application range reference selection is as follows: (wood liquid coating)
through the above, we have learned in the "oil-to-water" transformation of furniture coating on the spray system requirements, in the selection of water-based paint spraying equipment can be comprehensive reference to the above points, according to the actual status of the coating production line on the spray system reasonable optimization upgrade, so that in the "oil-to-water" coating transformation process more smoothly, product film effect is better, the coating process VOCs and lower costs.
as the saying goes: a good horse deserves a good saddle. Good spraying system also need to have a skilled paint master operation, how to correctly operate the air spray gun system, play its best spraying effect, wonderful content please reveal the next issue!
source: Dabao paint