The importance of lacquering on wooden doors

The choice of wooden doors is the face project of every family. It represents a way of life and a manifestation of our kindness to ourselves. With the continuous development of China's national economy, the pockets of our people are slowly rising, and the requirements for quality of life are getting higher and higher. This provides business opportunities for enterprises and faces challenges. How to guide the market consumption, provide environmentally friendly, beautiful, value-for-money products to the vast number of consumers, is the subject that every enterprise should face. It can be predicted that the market will have higher and higher requirements for the comprehensive quality of wooden doors, and the requirements for painting will be higher and higher. How to improve the connotation of products and standardize the standards of the industry, the wooden door committee has taken a key step, the overall level and strength of the industry will be highlighted, it will be independent of furniture and home improvement, and continue to high speed in an independent and healthy industry. development of.

China's wooden door industry is an emerging industry. Under the efforts of the Wood Door Association, it has achieved brilliant results in the past few years. However, there are still many factors affecting the healthy development of the wooden door industry. There is still much room for improvement in coating selection, coating process design, coating management, painting safety and many other aspects.

At present, most enterprises in the wood door market do not require high quality paints, which will inevitably lead to the appearance of wooden doors. The quality of the paint directly leads to improvement in coating management and production efficiency. In terms of coating varieties, polyurethane coatings are currently mainly used. Modern coatings should be coated with suitable products for efficient production, energy conservation, and environmental pollution. It is also the development trend of coatings. Therefore, the coating material should be made of polyurethane as the main coating material, which can provide good appearance decoration. With the development of modern coatings, unsaturated polyester lacquers have been widely used in the industrial production of wood. With the development and development of photosensitive coatings, they have gradually been accepted by the majority of wood manufacturing enterprises. Its excellent efficiency has attracted the attention of the majority of wood manufacturers, while the modern coating industry is developing towards a basic non-polluting water-based coating system, which will be the development direction of the main lacquer materials for our wood manufacturing.

In the process of painting, many manufacturers of wooden door industry still have many factors restricting the development of wooden doors.

First, painting equipment

At present, some manufacturers' coating equipment and painting environment are not ideal. They are mainly operated by gas-pneumatic spray guns. There is no formal gas distribution station and air purification system. The painting site is not standardized enough and the environment is poor. There are no formal standard job sites and spray booths. We should establish a gas distribution station and air purification system suitable for our own requirements and production. The equipment should be "online coating" based on mechanical spraying and automatic showering and roller coating. There should be a regular spray booth and painting line. Keep the site clean and tidy, and conditionally equip with a constant temperature system to ensure the quality of the coating and the stability of the production process. Door giants such as Stars and Maxim have introduced advanced coating lines to improve the level of mechanization, meet market needs and improve production efficiency, while improving the environment and setting an example for the development of the wooden door industry.

Second, the coating process design

Excellent coating materials, without the proper process, can not be used even if the coating itself has the best performance. At present, the use of two-component polyurethane coatings, unsaturated polyester coatings, photosensitive coatings, and other high-quality, high-demand coatings, as well as new processes and new equipment, are used in the wood coating process. The importance of process design.

To design the coating process, first of all, the coating should be selected according to the requirements of its own quality, and the principle of mutual matching must be followed. Secondly, to determine a reasonable coating process, a good coating must achieve a good performance of the coating through a reasonable coating process. Nowadays, the commonly used coatings are divided into a high-gloss coating process and a matte finishing process according to the film surface gloss. The exposed wood holes are divided into a closed-type finishing process and an open-type finishing process, and can be classified into a transparent finishing process and a color finishing process according to the texture classification. The third method is to select a reasonable coating method, and the painting method is a method in which the coating variety and the painting process are combined to carry out specific implementation. Therefore, the coating method is an important factor to ensure the quality of the coating.

Third, painting management

Painting is the final finishing of the product, so it is especially important for the manufacture of wood, and now some of the company's job site management is more casual. The personnel were not trained, the process was not standardized, and the management was loose, resulting in unsatisfactory quality and increased costs. Therefore, we attach great importance to talent training, production management, painting engineering operations, painting equipment, etc. The industrial production of modern wooden doors requires a close integration of technology and management. With the upgrading of technology, scientific and technological progress, there are better and more energy-saving coatings and mechanical equipment. Therefore, the coating industry should make progress and improve painting operations and management with a modern mindset. In the painting management, six links must be clarified. (1) Understand the factors of production: what to do, what to do, how to do it, where to do it, and when to do it; (2) Analyze the production composition: processing, inspection, handling, stagnation (3) Clear management functions; (4) Strengthen the quality control of painting operations; (5) Improve product quality management; (6) Conduct a summary analysis of bad projects.

With the development of synthetic resins, there are more and more coatings, and the composition of coatings is becoming more and more complicated. In order to promote the rationalization of the painting project, many new coating methods have been designed, and coating equipment suitable for large production methods has been developed, and the phenomenon and causes of coating film defects are also increasing. It is very difficult to find film defects caused by various factors such as coating and painting. Sometimes it takes a lot of effort to find out, but sometimes the morbidity that cannot be ascertained will disappear without knowing it. We should use the stable quality paint under the correct technical guidance, correctly grasp and use the painting machine, and keep it. A neat and tidy working environment, actively eliminating all external factors that may cause film defects.

The type, composition and quantity of wood are different, which will seriously affect the quality of the film. The moisture content of the porous material of wood not only affects the deformation and cracking of the furniture during use, but also the quality of the coating film in the painting process. The appearance of bubbles, flaking and the like in the coating film is related to the moisture content of the wood.

(1) There are many reasons for the occurrence of film defects. The following are common:

1. The influence of paint. The coating is the main body for forming the coating film, so the quality of the coating has a great influence on the quality of the coating film.

1) Whether the selection of paint varieties is reasonable.

2) Whether the interaction between the bottom and top coats is appropriate.

3) Whether the quality of the paint meets the specified quality indicators.

4) Whether the coating additives such as leveling agent, defoaming agent, drier, initiator and accelerator in the coating composition meet the requirements for use.

5) Whether the resin is gelled during the storage process before use, the pigment is sedimented, some components are separated and precipitated, and particles are generated.

2. The effect of adding thinner. In order to meet the construction requirements of different types of coating machines and the requirements of different manual operators, it is generally necessary to use additional thinner to adjust the construction viscosity before painting. In order to reduce costs, many users use self-purchasing dilute solvents such as xylene and butyl acetate. These solvents are often not subjected to the necessary technical treatment and quality control. Once an unqualified dilution solvent is added, many intentions will be generated. Unexpected consequences such as:

1) The effect of water content in the solvent. Solvents that have not been distilled or layered are often water-containing, and the water content has a great influence on the quality of the coating film. Mainly: â—‹1 makes the nitrocellulose paint film white; â—‹2 makes the coating film of most coatings turbid ; â—‹ 3 large-area bubbles appear in the polyurethane or PU polyester coating film.

2) The effect of solvent evaporation rate. The solvent evaporation rate is mostly related to the boiling point of the solvent. The high boiling point solvent volatilizes slowly, the low boiling point solvent evaporates quickly, and the solvent evaporation rate affects the drying property, leveling property and coating workability of the coating film.

3. The influence of painting machinery. The coating machines currently used include spraying equipment, lacquering machine, roll coating machine, ultraviolet curing machine, etc., which are continuously produced and intermittently operated. These coating machines and auxiliary equipment such as drying equipment and transmissions are used. Whether it is appropriate or not, it has a great impact on the quality of the film.

4. The influence of painting tools. Painting tools refer to hand-painting, squeegee, paint, cotton balls and paint containers in addition to painting machines. The cleaning degree, use and storage of these coating tools are all for finishing work and film quality. Have a certain impact.

5. The impact of the painting environment. The painting environment mainly includes the effects of environmental conditions such as cleaning, ventilation, temperature, humidity, and lighting of the painting room and drying room on the painting operation and the drying process of the coating film.

6. The effect of pre-coating treatment. Pre-coating treatment refers to the surface treatment of the coated wood, including uniform material selection, decolorization, degreasing, wood moisture content control, embedded putty, and pre-coating grinding.

7. The impact of painting operations. Such as:

1), the correct ingredients. When using two-component polyurethane coating, PU polyester coating or three-component unsaturated polyester coating, one side should be strictly according to the manufacturer's product description, and on the other hand, the usage time should be correctly determined according to the use requirements. For example, a two-component polyurethane coating or a PU polyester coating requires about 15 minutes of aging time; an unsaturated polyester coating should be used immediately after compounding to avoid waste due to delayed curing.

2) Strengthen the interlaminar grinding. Interlaminar grinding is a powerful measure to eliminate film bubbles, increase adhesion between layers, and increase the flatness of the film.

3) Correctly grasp the coating amount of the paint. The amount of coating applied is an indirect test for coating thickness. The control of coating thickness may have a direct impact on possible bubble, leveling, fullness and dry film permeability.

4) Check the sample frequently and correct the color difference in time.

5) Different coating surfaces should adopt different finishing processes.

(2) defects in coating film

It can be classified according to the defects that occur during the process of painting and the subsequent use, mainly in the following three types:

1. The defects generated during the painting operation are bubbles, whitish, sag, and biting the bottom;

2. The defects produced on the dry film after painting are mainly pinholes, shrinkage holes, orange lines, color difference, discoloration, dryness, brush marks and unclear wood grain;

3. Possible defects in the coating film during the use of furniture include color cracking, osmosis, flaking and white spots.

(3) Safety production of painting

At present, most of the wood coatings used for finishing furniture surfaces are diluted with organic solvents, and the content of organic solvents is about 60% in construction applications. These hydrocarbons, benzenes, alcohols, ester lamps and ketone solvents are easy to use. Combustible and explosive. At the same time, the gas of such organic solvents is also toxic to the health of the human body. It can stimulate human skin, mucous membranes, eyes, trachea and other organs; when the amount of organic solvent gas is inhaled, it can also cause headache, vertigo, blood cell reduction, Thrombosis, easy fatigue and bleeding gums should be strengthened, so safety and hygiene should be strengthened during the production process.

(4) The production safety management of the paint shop of the wood factory mainly has the following items:

1. Control the amount of paint stored. Strictly control the paint inventory of warehouses and production workshops. The setting and management of warehouses and workshops should comply with relevant laws and regulations such as fire protection laws and dangerous goods management regulations.

2. Strengthen the management of fire. All levels of personnel in furniture manufacturing plants should receive safety production education and learn to use various fire-fighting equipment. Fireworks are strictly prohibited, equipped with fire extinguishers and sand buckets.

3. Strengthen the inspection and maintenance of the safe operation of production equipment, especially pay attention to the regular cleaning, safety inspection and repair of the spray booth and workshop exhaust fan.

4. Control the amount of parts corresponding to the dry room and strengthen ventilation. A large amount of diluted solvent from the coated furniture parts accumulates indoors, and if there is no good ventilation, there is sometimes an explosion.

5. Strengthen the collection and management of flammable materials such as silk, fry, waste solvents, etc., so as to avoid spontaneous combustion and cause fire.

6. Pay attention to the operator's dressing and charging, and often sprinkle water on the ground to prevent fire caused by electrostatic discharge.

7. Pay attention to workshop lighting management.

8. Frequently check the electrical equipment and lighting circuits for fear of good condition and find that the fault should be repaired in time.

9. Regularly organize the physical examination of workers and find problems in time for treatment or exchange work.

10. Use high-quality paint with low toxicity as much as possible.

Sichuan Ruilaishi Coating Co., Ltd., located in Wenjiang District of Chengdu City, has been focusing on furniture wood lacquer for the past nine years. It has been operating with the integrity of the company and serving the society. The company, BYK and other multinational companies work closely together to introduce Italian paint research and development technology and advanced production technology. The product quality and stability have won unanimous praise in the furniture industry. It can be said that witnessed the rapid development of the entire furniture industry, there is deep research and practice in painting.

All of the above are the valuable opinions provided by the technicians of Sichuan Ruilais Coating Co., Ltd. to the wooden door enterprises. Here I will relay them to you, hoping to help everyone.

At present, Sichuan Ruilai Shi Coating Co., Ltd. has started cooperation with the wooden door industry. Chongqing Meixin Jiameimen has started to use the company's products, and has passed the quality and price certification of the products in the star suit door. After the cooperation with the company, the wooden door enterprises such as Chengdu Imperial Wind can also feel the stability of Ruilai Shi. Excellent product quality and comprehensive technical support. Sichuan Ruilai Shi hopes to have more opportunities to serve the majority of wooden door enterprises.

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