ASTM D412-0 “Removal of Varnish on Wood Surfaces”

This chapter is applicable to the application of varnish to the surface of wood parapets, hardwood doors and Windows, door and window sets, fixed furniture, stair hardwood handrails, etc.

ASTM D412-0 “Removal of Varnish on Wood Surfaces”

I. Main Materials:

Paint: varnish, alkyd varnish, bottom varnish, surface varnish, lacquer, etc.

Filling material: gypsum powder, white powder, pigment, etc., the putty should be used in accordance with the performance of the paint.

3 Thinner: alkyd thinner, gasoline, alcohol, etc.

4 Polishing agent: soap, sand wax, polish wax, etc.

5 The plasticity and workability of putty used should meet the construction requirements, and according to the performance of primer and finish paint matching selection.

Paint and supporting materials need to have factory certificate, quality certificate, coating harmful substance content test report. The content of harmful substances in the coating and the selection of diluent shall comply with the relevant provisions of the Limit of harmful substances in Solve-based Wood Coating for Interior Decoration Materials (GB18581-2001) and the Code for Indoor Environmental Pollution Control of Civil Construction Engineering (GB50325-2001).

ASTM D412-0 “Removal of Varnish on Wood Surfaces”

Ii. Main machines and tools:

The main machines and tools include: knife, steel skin scraper, rubber scraper, horn scraper, paint brush, row brush, oil brush, putty trough, large paint bucket, small paint bucket, oil spoon, measuring cylinder, gauze screen, hemp silk, lint cloth, cotton silk, white cloth, mask, gloves, wood sandpaper, water sandpaper, pliers, small hammer, safety belt, high stool, foot board, polishing machine, etc.

ASTM D412-0 “Removal of Varnish on Wood Surfaces”

Iii. Operating conditions:

1 Wet operation has been completed, the environment is clean, dry and well ventilated, the operating temperature is stable above 10℃, and the relative humidity should not be greater than 60%. The moisture content of wood base shall not exceed 10%. If the interior is not closed during paint construction, wind protection measures should be taken, otherwise the construction shall not be carried out in windy weather.

Before THE construction of a large area, make a good sample in advance, after the owner and the quality inspection department acceptance appraisal, before the construction of a large area.

3. Before construction, the handover inspection should be carried out carefully with the previous process, and the problems found should be dealt with.

4 For the operation above 3.6m, scaffolding should be set up in advance, and the safety acceptance shall be completed, and the construction of plumbing and electrical engineering shall be completed.

ASTM D412-0 “Removal of Varnish on Wood Surfaces”

Iv. Operation process:

(I) Process flow:

(2) Operation process:

1. Basic treatment: remove dust and stains from wood surface. If there is oil, can be scrubbed clean with thinner. The depth of the nail into the wood surface should be greater than 0.5㎜. Polish the base surface along the wood grain, not horizontal grinding or oblique grinding. After grinding and grinding all floating objects, wipe the surface clean, such as wood surface color should be done bleaching treatment (bleaching agent generally with hydrogen peroxide: ammonia =4:1).

2. Sealing oil, putty polishing: first sealing oil and putty polishing smooth.

3. Brush THE FIRST TIME VARNISH: varNISH should be painted along the direction of wood grain, not horizontal brush, oblique brush, brush leakage and flow drop, and should maintain the appropriate thickness. Varnish should be spaced one day after drying, until it is fully dry, particles and flying spines all warped, conducive to polishing.

4. Color: Rub evenly with a soft white cloth.

5. Brush the second to fourth times of varnish: check the effect of color matching and coloring, after meeting the requirements, you can apply the second to fourth times of varnish in turn. After each time the varnish is applied to dry, it is necessary to use 1# old wood sandpaper to polish it again, and the fine particles on the film are ground off and wiped clean before the next time the varnish is applied.

6. Color matching and color fixing: If the local color is found to be inconsistent with the color of the sample after the fourth varnish is applied, color matching and color fixing should be carried out according to the color of the sample. Oil color or fine color can be used to match color and repair color. To the area of small putty scar, generally can use oil color, to the larger area of color inconsistent can use color fine.

7. Polishing: after the fourth time of varnish drying, grinding with 280# ~ 320# water sandpaper, requiring smooth grinding, careful grinding, grinding all parts to, pay attention to the edges and corners can not grind white or grind through. Wipe off the sewage after polishing and wipe clean with water.

ASTM D412-0 “Removal of Varnish on Wood Surfaces”

8. Brush the varnish for the fifth and sixth times: as the last two times of the varnish grinding process, the application method is the same as above. At the same time, the sixth paint is required in the fifth paint has not been completely dry under the condition of continuous brushing, which is conducive to the full and smooth coating film, and is not easy to be worn or worn through in the grinding back.

9. Grinding: After the last two times the finish paint is dry, use 400# ~ 500# water sandpaper dipped in soapy water to polish the gloss of the coating surface. When grinding, the force should be uniform, requiring smooth and meticulous grinding, and the surface gloss should be completely polished and smooth. Wipe and dry after grinding.

10. Sand wax: first of all, the sand wax with kerosene into porridge, with a clean flannelette dip in sand wax, along the direction of wood grain back and forth rub, until no bright stars. The strength should be even, the edges and corners should be rubbed, and the edges and corners should not be worn out. Finally, wipe the surface of the floating wax with a clean lint cloth, and use the polishing machine with even force.

11. Wipe THE POLISH wax: with a clean white cloth will polish wax package in the inside, in the paint coating repeatedly rub rub, wipe evenly, wipe clean, until bright.

ASTM D412-0 “Removal of Varnish on Wood Surfaces”

V. Quality Standards:

(I) Main control items:

1. The variety, type and performance of the paint selected for the paint project should meet the design requirements. The content of harmful substances in the paint and the selection of diluent shall comply with the relevant provisions in the Limit of harmful substances in solve-based wood coatings for Interior decoration Materials (GB18581-2001) and the Code for Indoor Environmental Pollution Control of Civil Construction Engineering (GB50325-2001).

2. The color, gloss and pattern of the paint project should meet the design requirements.

3. The paint project should be painted evenly, firmly bonded, not leakage, through the bottom, peeling and anti rust.

4. The moisture content of wood base shall not exceed 10%.

(2) General items:

1. The finishing quality and inspection method of wood surface varnish should comply with the following table.

Quality and test method of wood surface varnish grinding and refinishing

Inspection method for ordinary finish and advanced finish of sub-project

ASTM D412-0 “Removal of Varnish on Wood Surfaces”

1. The color is basically consistent and uniform

2. The brown eye of wood grain is scraped flat and the wood grain is clearly observed

3 Gloss, smooth gloss is basically uniform, smooth without blocking hand feel gloss is uniform, smooth observation, hand touch inspection

4 Brushless brushless observation

It is not allowed to observe the obvious places OF ribbing, falling and wrinkled skin

Observe the cleanliness of doors and Windows, hardware and glass

The CONNECTION BETWEEN THE COATING AND other decoration materials and equipment should be consistent, and the interface should be clear.

Vi. Protection of finished products:

1 Clean up the surrounding environment before brushing oil to prevent dust from flying and affect the quality of paint.

2. Pay attention to environmental hygiene when painting each time, and do not paint in windy weather and indoor cleaning. Doors and Windows after each paint brush, the doors and Windows should be fixed with a spike hook or wooden wedge to avoid sticking the paint coating.

ASTM D412-0 “Removal of Varnish on Wood Surfaces”

3 Be careful not to knock and stain the paint surface. The oil stains on the ground should be cleaned up in time.

4. Assign special personnel to take care of the painting after finishing.

Seven, should pay attention to the problems:

1 angular putty is not smooth: mainly putty is not full, and caused by contraction. The solution is to fill the putty again, until it is smooth, dry and smooth with sandpaper.

2 Wear edges and angles: mainly the edges and angles are easy to wear out, wear out. Do not use too much force when grinding water sandpaper and sand wax, and use light grinding to keep the edges and corners intact.

3 flow drop: it is mainly caused by uneven brushing, too thick coating, too much oil on the brush, or too low temperature. The solution is to sand the advection drop with water.

4 Hardware pollution: the operation should be careful, timely clean the pollution. Hardware as far as possible in the paint after the installation, paint can be pre-installed hardware hole drilling.

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