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The use of waterborne wood paint coating line is in a wooden chair
preface
Wood has the advantage of light weight, strength, easy processing, low thermal conductivity, good electrical insulating function, resonance outstanding merits and so on. And because of the natural wood texture and texture with the aesthetic feeling of like nature itself, wooden products constantly liked by people and is special in the furniture industry, wood furniture to account for more than 90%.
Household market, economical wooden chair is one of the wooden furniture of consumer love. Whether their own restaurant, restaurant, hotel guest room as all kinds of layers, everywhere can see fine about not stingy wooden chairs. Wooden chairs in furniture sales, according to some proportion also quite large. So follow produce wooden chair enterprise vigorously, developed the suitable coating paint for wooden chairs and colorants and other products, is crucial in the furniture market.
A, wooden chair commonly used coating type
Commonly used solvent wood coatings have polyurethane (PU) coating, nitrocellulose (NC) paint, alkyd coatings, unsaturated polyester (PE) coatings, ultraviolet (UV) curing coatings, acid (AC) curing coatings, etc.
B, wooden chair line was introduced
2.1, an assembly line
Current production compare with big produce wooden chair manufacturer, produce general secondary planning of eat chair manufacturer 1000 tons or more, so much is required to produce manufacturer has a very high production efficiency. So produce wooden chair manufacturer USES mostly coating line homework. Eat chair line first walked by loading bay, active system (the ground or hanging), center for the paint system, water screen type spray paint room, dust grinding machine, heating system and baked coherent system.
Center for paint system is from the center for more homework points in the paint room to plant focus cycle walks coating, the paint and walks and spraying equipment, predecessors, economy applicable skills improvement, make the coating quality and degree of technology has made great progress. For high-pressure airless spraying paint concentrate produced with high efficiency, and popular air spraying, produce efficiency can progress several times; Pollution is small, the situation and popular air spraying, paint mist cut by more than 70%, greatly reduce the pollution of the situation, to improve the operator's task premise, reduces the labor intensity; Can construction large viscosity and high solid coatings, a film thickness, cutting spraying times; Don't use squeeze air and reduce the pollution of the water, oil, dust and other impurities and the chances of coating defects, flat coating appearance, good plumpness, coating structure compact, attached to the output is strong, can advance the using life of coating.
Adopt heating coherent system which are forced to avoid the waterborne wood coatings moisture volatilizes slower, boring time long defects, can maximum horizontal acceleration workshop production process, the yield efficiency and solvent NC coating at all.
C, the coating process
Eat chair coating used for ju wood, oak wood, northeast China ash, maple wood, such as coating results is given priority to with open and half open. And varnish and color paint, varnish can do nature (do not do any color results) coating as a result, also can do the bright color painting as a result, the bright color results ordinary bottom color coloring process: Solid color more ordinary black and white. Technology adopted ordinary are two bottom side or bottom of the two sides, every times spray 1 ~ 2 guns, each time after coating spray to dry at room temperature about 10 min, coating table dry after entering the baking system to forced drying (normal temperature measured in 30 ~ 40 ℃) 1 h or so, cooling grinding dust after 10 min, and then into the next procedure. Through a wooden chair after coating film lubrication is exquisite, feel is good, wood varnish were blazing in clear, natural color, solid color paint hiding power, that never fade, color temperature or gorgeous. To produce all eat chair manufacturer use water dish greatly line and typical coating process.
Based on coating line of waterborne wood paint formula, from boring speed, sag resistance, resistance to bite wood reinforcement results and anti aging results on thinking about design.
D. 1, choice of main body of the resin
Is often seen in waterborne wood coatings resin has the following categories: waterborne alkyd resin, water-based acrylic emulsion, water-based polyurethane body, waterborne acrylate modified polyurethane emulsion and waterborne epoxy resin and water-based uv-curable resin [4]. Waterborne alkyd resin dry slow, poor coating hardness; Waterborne epoxy resin is a multicomponent system, water-based uv-curable wood coatings needs a specific device, use not convenient. Most appropriate as the wooden chair coating of water-based resin system for waterborne acrylic emulsion, waterborne polyurethane dysfunctional body and waterborne acrylic modified polyurethane resin, these a few kinds of resin is one component, when using only need adjust viscosity in accordance with the requirements of factory, can use continuously, there is no time limit and equipment limitations.D. 2, choice of film forming additives
In order to reach the result of the quick drying, when choosing film-forming agent, we can choose a few product of volatile speed relatively quickly, such as DPM, PnB, BDG, etc. Open time to film, of course, also can match the product of the higher boiling point, such as DPnB, TPnB twelve ester and alcohol, but moderation additives and the compatibility test and resin. Wooden chair coating are mostly demand forced baking dry, so the film-forming additives added quantity does not demand too much.D. 5, colorant formula design
In order to advance efficiency, wooden chair color when produce mostly USES the coloring process, and at the end of shi foreman degrees boring distance as long as 10 minutes, when the average and coloring, strong pull mu wen result. So the wooden chair with colorants demand has strong penetration and good anti floating color function. We can choose ferric oxide series of water-based pigment paste, good color fastness and has a good sense of clarity and order; If demand better lit degrees, can choose water-based metal complexing dye. Colorant first is given priority to with water, in order to avoid the floating color and attached to the output, demand add 10% water-based resin to package pigment or dye particles, water-based resin choose small particle size and good penetration results, and add the excess substrate wetting agent to reduce the surface tension of the product, improve spread out the results of the colorant, can repair the average color.E、Epilogue
After reasonable formula design of waterborne wood paint after coating line, wooden chair, the output through the test, can be a stern test Sweden IKEA. Waterborne wood coatings, therefore, the current used in China are greatly ikea generation works to replace traditional solvent-based NC lacquer to produce wooden chairs. Because of waterborne wood coatings produced wooden chair besides reached the solvent on the mechanical function of NC lacquer as a result, but also has more and more environmental protection this selling point, with strong market competitiveness in the market.
Follow coating category extension from time to time, to be painting objects increasing varieties, each painting objects to the functional requirement of the results of coating and coating also each different, prompting varieties of paint coating industry division is becoming more and more thin. In the process of the development of waterborne wood coatings, in view of its characteristics, choose a suitable coating category, then select a method of optimal coating can foster strengths and circumvent weaknesses, make the waterborne wood coatings are surrounded in the process of the market to find a good break mouth, and then accelerate the industrialization course of waterborne wood coatings and skills to carry out [5]. Waterborne wood coatings in the successful use of the coating line is wooden chair, to the expansion of the waterborne wood coatings using category and has major significance.