company news about Painting process of wooden door painting

The application technology of wood door painting is divided into three parts: the selection of paint, the design of painting process, and the application of painting equipment. First, the selection of paint
Coatings are mainly divided into: PU paint (polyurethane paint), PE paint (unsaturated resin paint), NC paint (nitro paint), UV paint (UV-curable paint), W paint (water-based paint) these five kinds. In the painting of wooden doors, the above five kinds of coatings are commonly used. They occupy different shares in different periods and different types of enterprises.

1. PU coating
PU coating is one of the most commonly used paint varieties in domestic enterprises. It has good comprehensive performance, such as: good construction performance, filling, fullness, hardness, grinding, scratch resistance have good performance. PU paint in the application of wood door coating is the most.

2, PE paint
PE paint is the most commonly used PE primer. It is divided into transparent primer, colored primer (mainly white primer). PE primer is a kind of paint with high solid content, high hardness, strong sag resistance and high fullness, but its construction performance is more complex and brittle. PE finish paint only bright products, there is no matte surface, so the use of PE finish paint in the painting of wooden doors is rare.

3, NC paint
NC paint is a very old kind of paint, and it is also a widely used variety. Its main applications on wooden doors are: transparent nitro paint, colored nitro paint (white, beige mainly). Nitrocellulose paint has better construction performance and shorter painting operation time. Transparent nitro paint is commonly used to do 'open', 'semi-open' coating effect, with good performance. The solid color lacquer multi-purpose in coating effect.

In Hong Kong-funded wooden door enterprises, when doing engineering door projects, the most common is to use nitro solid color base and nitro solid color surface to carry out painting operations. Of course, it also has limitations, such as insufficient fullness, poor hardness, poor solvent resistance, not suitable for high fullness, high gloss products.

4. UV coating
UV coatings are currently recognized as one of the two most environmentally friendly coatings in the world (the other is water-based paint). As a new paint, it has been rapidly developed in recent years, especially in the Pearl River Delta region, the Yangtze River Delta region furniture factory, wooden door factory, wood flooring factory are used very much, which is a very significant expansion of the new paint; With this matching process, equipment, technology is more and more mature.

The first companies to use UV coatings are mainly concentrated in Hong Kong-funded enterprises in the Pearl River Delta region. It is originally used to make transparent or transparent colored flat wooden door products with transparent UV bottom and UV surface. With the common development of UV coating technology and equipment technology, the construction technology of solid color UV products is also mature, and at present, many enterprises in the Pearl River Delta region have used UV coating in the production of solid color wood doors.
UV coating in addition to environmental protection, its coating performance is also very excellent, with good hardness, chemical resistance and so on. High efficiency and low cost are also key factors for UV coatings to be widely used. Its efficiency is dozens of times that of the general painting efficiency, and the cost of the paint used is 1/3-2/3 of the general paint. If labor costs are included, the savings are even greater.

However, UV coating also has its limitations, it can only be used for flat wooden doors, using the roll coating operation method. In addition, the investment of UV coating on equipment is relatively large. In the early days, the price of a complete UV coating line imported from abroad was as high as 15 million yuan. At present, there are many joint ventures and foreign-funded enterprises in the production of similar equipment production lines, with prices ranging from hundreds of thousands of yuan to several million yuan.

5, W paint
W coating is a water-based coating, its environmental protection and UV coating, is the most environmentally friendly coating variety. Waterborne coatings are a new variety of coatings with rapid development. In Europe and the United States, most of the home decoration uses water-based paint to construct. There are relatively few applications on furniture and wooden doors, but some companies use water-based coatings to meet some foreign specific customer requirements.

Water-based coatings, relatively speaking, the solid content is low, the paint film is thin, the hardness is small, the water resistance is slightly poor, the cost is high. However, with the continuous development of coating technology, these limitations are gradually being solved.

What kind of coating varieties need to be selected for wooden doors, but also according to the positioning of their products and the different requirements for the surface effect of the products. Reasonable selection, in order to achieve satisfactory results, and save labor and materials. On the contrary, they pay a high price but do not achieve the desired effect. For example, the customer requires that the wooden door has a good fullness, and the manufacturer uses NC paint for painting operations, even if it takes twice as much time and twice as much material, it can not make too good results. On the contrary, if the customer wants a fully open painting effect, the choice of NC paint at this time is an excellent choice.

Second, coating process design

1. The basic basis and procedure of its process design are:
According to the customer's requirements and standards for wooden door products, select coating varieties, determine the painting process and equipment configuration.

2, common wooden door product coating requirements and standards

(1) Requirements for environmental protection

If the customer has no special requirements, in accordance with the 'national standard GB-18581' implementation. There are more stringent environmental requirements, which can be based on the specific parameters provided by customers.

(2) Requirements for the surface effect of the coating

Overall effect: fully closed, semi-open, fully open effect. Specific usually: gloss, color, fullness, permeability, hardness, leveling, soft scratch resistance, adhesion, brittleness and so on.

(3) Chemical resistance requirements of the coating: yellowing resistance, acid and alkali resistance, resolubility

3, paint products
The selection of coating products is a very important link in the design of coating process. The specific basis of selection is: the requirements of the effect, the requirements of environmental protection, the requirements of cost, the requirements of efficiency and the requirements of operating habits.

4. Painting operation process
The painting process is the most critical part of the painting process design of wooden doors. The design of painting process is very important to the efficiency, cost and effect of painting. Sometimes, different painting processes can be designed for the same painting effect, but how to choose the most efficient job design is an important technology, which requires profound technology accumulation and painting application ability.

5. Selection and configuration of coating equipment
After the selection of coating products and the design of painting process, the selection and configuration of painting equipment will have a fundamental impact on the painting efficiency. With the continuous increase of labor costs, technical talents are increasingly scarce, and the use of automatic painting and polishing equipment is particularly important. Especially in the field of wooden door manufacturing, the grinding efficiency of the product is the most critical link of the final efficiency of wooden door manufacturing, and it is also an important reflection of the manufacturing capacity of an enterprise.