（6） Construction technology of mixed color paint for wood facing 1
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Construction preparation (1) technical requirements before construction, the technical disclosure personnel must carry out the written technical disclosure of wood facing paint construction to the construction team（ 2) Material requirements coating: nitro paint (3) main machines and tools brush, paibi, shovel （ 4) Working conditions: 1) the construction environment should have good ventilation
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After the plastering works, ground works, wood decoration works, plumbing and electrical works are completed, the environment is relatively dry, and the relative temperature is not more than 60%; The moisture content of the structure surface to be decorated with wood veneer shall not be greater than 8% – 12%
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The indoor temperature is generally not less than 10 ℃ ° C。 2) After the sample room is inspected and identified by the owner and the supervision company, the team can be organized to carry out large-scale construction
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3) Before construction, the material of wooden doors and windows and the appearance of wood veneer shall be inspected, and the unqualified ones shall be replaced
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The moisture content of wood products is not more than 8% – 12%
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4) Before operation, the process handover inspection shall be carried out carefully, and the paint construction shall not be carried out if it does not meet the specification requirements
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5) Before construction, all kinds of materials must be submitted for inspection and sealed after being confirmed by the owner and the supervisor
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The samples that have been submitted for inspection must be accepted by the owner and the supervision company when they enter the site in large quantities
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Only after the relevant written acceptance sheet is issued can they be used out of the warehouse
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2
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Key quality points (1) key requirements of materials: 1) there should be use instructions, storage validity and product certificate, and the variety and color should meet the design requirements
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2) The selection of paint, diluent and other materials must comply with the requirements of code for indoor environmental pollution control of civil building engineering (GB 50325-2001-3.3.2) and limits of harmful substances in solvent based wood coatings for interior decoration materials (GB 18581), and have the limit level test report of relevant harmful substances issued by relevant national environmental testing institutions（ 2) Key technical requirements: 1) the base putty should be scraped and ground to be firm and free from pulverization, peeling and cracks
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2) Solvent based coating shall be applied evenly and firmly without leakage, bottom penetration, peeling and anti rust
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3) The latter painting must be carried out after the previous painting is dry（ 3) Key quality requirements: 1) the hinge groove, upper and lower risers, mortise and nail holes, cracks, knots and edge defects should be filled with putty, sandpaper grinding should be in place
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It should be operated according to regulations and process standards
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2) The base putty shall be smooth, solid and firm without pulverization, peeling and cracks
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3) The paint shall be evenly applied and firmly bonded without bottom penetration, peeling and rust
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4) The ambient temperature of general painting construction should not be lower than + 10 ℃ °， The relative temperature should not be more than 60%
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3
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Construction Technology (1) process flow ( 2) Key points of Construction: 1) base treatment: before coating, dust, oil stains, glue marks and wood burrs on the surface of wood shall be removed, and defective parts shall be filled, polished and decolorized
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2) Brush base oil: brush in strict accordance with the brushing order, and brush until even
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3) Puttying: the cracks, nail holes and incomplete edges shall be embedded and leveled
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The upper and lower risers and tenons should be repaired
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4) Sanding paper: the putty should be dried thoroughly
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When sanding paper, do not wear through the film, protect the edges and corners, and pay attention not to leave loose traces of putty
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After grinding, clean it up and wipe the scattered dust with damp cloth
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5) Brush the first coat of paint: the viscosity of the paint is thin and uniform
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After finishing the painting of doors, windows and wood veneers, check carefully to see if there is any missing brush
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Finally, fix the movable fan temporarily
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6) Sanding paper and glass installation: after the paint is dry, polish it with paper
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The operation method and requirements are the same as those of the construction process (4), and then install the glass
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7) Painting for the second time: painting is the same as the key points of construction technology (5)
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If there is glass in wooden doors and windows, clean the inside and outside of the glass with damp cloth or waste newspaper, and pay attention not to damage the putty and octagonal corner of the glass (if the glass glue is applied, wait until the glue is dry)
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Sanding paper requirements are the same as the key points of construction technology (4)
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When using new sandpaper, two pieces of sandpaper must be grinded to remove coarse sand particles to prevent the paint film from being scratched
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8) Brush the last coat of paint: pay attention to the paint does not flow does not fall, bright uniform, consistent color
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Putty (glass glue) should be dried thoroughly
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Check carefully
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Fix movable door (window) and pay attention to finished product protection
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9) Winter construction: indoor should be carried out under heating conditions, the room temperature should be balanced, and the temperature should not be lower than + 10 ℃ ° C
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The relative humidity should not be more than 60%
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A special person shall be assigned to open and close the windows to facilitate moisture removal and ventilation
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4
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Quality standard (1) main control item 1) the type, model and performance of the coating used in solvent based coating engineering shall meet the design requirements
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Inspection method: check the product certificate, performance, environmental protection test report and site acceptance record
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2) The color and luster of solvent based coating engineering shall meet the design requirements
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Inspection method: observation 3) solvent based coating engineering should be applied evenly and firmly without leakage, bottom penetration, peeling and anti rust
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Test method: observation and hand touch
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4) The base putty shall be smooth, solid and firm without pulverization, peeling and cracks（ 2) General items General items of applying solvent based coating on the surface of wood decoration 5
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Finished product protection (1) before painting, the garbage and dust on the construction site should be cleared to avoid affecting the quality of the paint（ 2) After each painting, all movable door leaves and finished wood veneers should be temporarily fixed to prevent the paint surfaces from bonding with each other and affecting the quality
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Warning signs should be set when necessary（ 3) The paint dripping on the ground or windowsill shall be wiped clean immediately after oil painting
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The hardware and glass shall be protected with newspaper and other isolation materials in advance and removed before the completion of the project（ 4) After painting, a special person shall be assigned to take care of it
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Touching is strictly prohibited
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6
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Quality record (1) the material shall have certificate and environmental protection test report（ 2) There should be quality inspection and evaluation data for project acceptance
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7
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The quality problems and preventive measures of Painting Engineering: (1) common quality problems: serious brush marks
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Cause analysis: A
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uneven brush caused by too large brush or too hard bristle or poor storage of brush
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B
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The viscosity of the coating is too high and the diluent develops too fast
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C
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In the brushing of wood products, there is no vertical operation along the grain direction
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D
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The surface to be coated has strong absorptive capacity to the coating, so it is difficult to brush
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E
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The paint is oily or mixed with water, so that the leveling property of the paint is poor
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Preventive measures: A
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according to the site, try to use a new paint brush
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The bristles of the paint brush must be soft and even
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The force is average and the action is light
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B
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To adjust the viscosity of the coating, the matching diluent should be used first, and the construction should be carried out along the grain direction
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C
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First seal the bottom with low viscosity paint, and then brush normally
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D
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The selected coating should have good leveling property and proper volatilization
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If the coating is mixed with water, it should be sucked out with filter paper and then reused
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E
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Treatment: use water sandpaper to polish gently, clean up and then brush the paint（ 2) Common quality problems: cause analysis of cross pollution: A
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During the construction, the finished product protection is not done or the protection is not in place, the quality inspection is not in place and not careful
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B
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The awareness of finished product protection of construction personnel is poor, and the construction is careless
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C
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Preventive measures for reverse construction (for example, the hinges of doors and windows are installed first and then painted): A
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before construction, all parts that will produce cross pollution shall be protected in place and tightly protected
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B
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When the quality personnel check the quality, they should strengthen the strength, be careful and thoughtful, strengthen the finished product protection awareness of the construction personnel, and often train their construction technology and quality awareness
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C
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According to the sequence of construction procedures (such as doors and windows, should be painted before the hinge)（ 3) Common quality problems: nail hole obvious cause analysis: A, nail too big
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B
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When the putty is applied to the nail hole, it is not completed.
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