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Lacquer furniture construction FAQ

Time：2014-07-30　Click：

Furniture factory in the coating production process, often in the face of all kinds of lacquer disease, greatly affect the furniture production efficiency, lead to high pass rate, large amount of rework.

The 1 film white (or white)

(1) abnormal phenomena: coatings during drying or drying paint appears milky white or wood, substrate background unclear phenomenon, serious and even without light, dulling.

(2) cause: Construction in the high temperature environment; water containing paint or thinner; construction of oil-water separator malfunctions, moisture into the coatings wet; glaze; hand sweat stain workpiece workpiece or water wet; disposable too thick coating substrate; high moisture content; grinding place after a long time, the moisture adsorption in the film surface; primer containing high content of thick powder coated in dark plate waiting.

(3) preventive measures: to avoid the construction in high temperature and high humidity environment; control the moisture content of the substrate, must fully after drying coating can be carried out; paint or thinner in storage and coating construction process to avoid into the water; regularly check and clear water in the oil-water separator; wet focuses not on to the next stage of coating; hot weather construction to prevent the operator hand sweat stain workpiece; such as water, need to wait for the workpiece completely dry after the painting; try to avoid the time of thick coating; inter layer after grinding placed time should not be too long, lest moisture adsorbed on the surface of the paint film, should as soon as possible for spraying the next procedure; primer containing powder the high amount of thick plate fine to avoid coated in dark.

After spraying white (or white) found, can add air defense white water, anti white of a certain amount of water to replace the original with diluent ratio from less to more, a small amount of problem solving, not much amount limit amount of white water, prevention is primary diluent 25%. The correct method is mixing before putting anti white water and diluent according to the required amount allocation, stir well, then add in coatings.

2. Blistering or pinholes

(1) anomaly: the coating in the construction process between the two paint film surface exhibits a circular protrusion deformation, usually generated between the surface to be coated with paint, or; the bubble is a coated cells present in the film-like morbid, if the coating film in the coating process and the drying process of the collapse of bubble flow but not the final level, the formation of pinholes; a presence of pinholes in the coating by needling similar into the pores of the disease.
(2) Reason: wood moisture content is high, there is no closure or closure is not good; wood eyes too deep; oily or aqueous putty or primer is not completely dry when wet coating surface coating on; thinner selection unreasonable, too volatile fast; paint into the water; a coating is too thick; high viscosity workers; excessive amount of addition curable Jing; construction temperature is too high, dry too fast; strong convection, resulting in dry too fast; improper gun operation.
(3) preventive measures: control of wood moisture content less than 12%; as much as possible the use of sealer, dark wood eye plate for more to be closed; should, after the putty, primer fully dry before construction surface coating; add slow the water, adjusting the evaporation rate; strictly avoid paint into the water; thin coating many times, especially in light of primer and topcoat; the right amount to reduce the viscosity of construction; rata adding hardener; above 35 degrees to avoid the construction, such as not avoid, you can add the right amount of water slowly dry; the transformation of the spray booth ventilation; to strengthen training of personnel to operate the spray.

(1) anomaly: the size of the film flow after several flat drying exist ranging irregularly distributed circular pit (crater) phenomenon.
(2) Reason: coating the surface of the contaminated oils, waxes, hand perspiration and the like; water is brought into the air with the coating; environmental contamination; coating itself is contaminated; oil spray air or water; the surface to be painted is too smooth; two-component paint sometimes with uneven tone, there will be shrinkage; paint is not complete.
(3) Precautions: Avoid coating surface oils, waxes, hand sweat and other pollution; handle oil-water separator, let go of the water inside the compressor; cut off the sources of pollution; replace paint; regular cleaning of oil-water separators; surface polished pretreatment; still later after full mix thoroughly with paint, then paint; paint matching principles to be together.

The bottom bite

Anomalies: the film during drying paint swell upper or lower after the paint dried paint from the bottom of the lower layer to produce the projections, deformed or even peeling phenomenon.
Cause: The underlying coating is not complete; the lower one spray paint is too thick; the lower the upper paint does not dry on construction; upper paint containing too strong solvent; coating surface contamination.
Precautions: painting needs to be based on selecting the right paint varieties, and pay attention to matching the performance of the underlying coating; lower disposable spray paint can not be too thick, in order to avoid the bottom of the drying time is too long or quit; the underlying paint to fully dry, to be the next step painting process; general upper paint thinner, the strong solvent not too much, so as to avoid damage to the underlying paint; paint surface should be cleaned of contaminants before construction.

5. Slow dry or quit

(1) anomaly: the drying rate after coating application exception, appear slow dry or quit.
(2) Cause: PU paint hardener not add or increase the amount is not enough; the construction of low temperature or humidity is too high; when dealing with white, anti-Whitewater adding excess fat; sheet metal with a high content of oil or grease; paint is not complete; disposable spray thick; interlayer spacing is too short; finish is dry too fast, surface dry bottom quit.
(3) Preventive measures: use of qualified paint products; must be filtered before use with paint before a good tune and control the amount of paint, so as not to place too long; thinners to dissolve the intensity and amount to be appropriate; construction tools necessary clean, and maintain a good spray booth sanitation; grinding process should pay attention to dust, dust removal system to ensure the effectiveness and correct operation of the gun.

6. Particles

(1) anomaly: more dry film surface of the particles, the particles just like prickly-like projections, feel rough, not smooth.
(2) Reason: coarse paint itself; that the use of paint unfiltered; place for too long after the transfer of oil; paint thinners to dissolve poor, high viscosity coating construction; construction tools unclean; sanding dust when handling unclean ; dust removal system is bad, poor working environment; gun gas, oil is not adjusted.
(3) Preventive measures: use of qualified paint products; must be filtered before use with paint before a good tune and control the amount of paint, so as not to place too long; thinners to dissolve the intensity and amount to be appropriate; construction tools necessary clean, and maintain a good spray booth sanitation; grinding process should pay attention to dust, dust removal system to ensure the effectiveness and correct operation of the gun.

7. Loss of light

(1) anomaly: loss of gloss paint just refers to the film after curing no gloss, or gloss bad, uneven phenomenon.
(2) Reason: hot and humid weather can cause the loss of light; spraying air pressure is too big, too small oil; construction viscosity is too low, add too much thinner; diluent evaporation rate is too fast, resulting in loss of light; mismatches cured agent; matte paint brush that line did not stir; the coating is too thin, leveling bad.
(3) Preventive measures: adding an appropriate amount of water slowly dry, coating weight control, bad weather stop construction; control the spray pressure, oil; reduce the amount of diluent added; selection of slow dry thinner or add slow dry water; supporting the use of curing agent; matte paint to mix evenly with paint before; and so on to ensure adequate film thickness.

8. Sagging

(1) anomalies: Coating applied to a vertical surface, the sag resistance due to the wet paint leaving poor downwardly moved, the surface of dripping, sagging, uneven film phenomenon.
(2) Cause: The painted surface is too smooth; low viscosity coating application; disposable spray coating is too thick; spraying too close to the gun moving too slow; concave uneven edges or objects, corner, line angle slot at brushing likely to cause uneven jointed, thicker at the necessary flow; construction ambient temperature is too low, the film dries slowly; the primary surface of objects with oil, water and dirt and paint incompatible influence stick Next, resulting in sagging film; paint pigment containing heavy too, some paint sagging.
(3) Precautions: viscosity to maintain normal; non-disposable impasto; adjusting the environmental temperature, the surface should be dealt with smooth, clean, remove surface oil, water and other contaminants; choose the right paint.

9. Cellulite

(1) anomaly: the coating surface presents many semicircular projections, the shape of orange peel-like markings.
(2) Reason: adding too much water dilution; each painting too thick, heavy spray improper time; construction ambient temperature is too high or too low, the object surface uneven, dirty, substrates of complex shape and contain water; construction improper operation.
(3) Preventive measures: proportional plus diluent; For thicker thin spray coating should be repeated at intervals appropriate to dry, every film should not be too thick; ambient temperature is not too high or too low construction; handle the remaining surface spray, without water and oil; proper construction.
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10. The color separation

(1) anomaly: the film after construction uneven paint color, shades or irregularities phenomenon.
(2) Reason: the lower layer of paint does not dry that is coated with lacquer; thinners to dissolve it is not enough; the pre-construction stirred inadequate; pigment dispersion improper selection or bad; the inferior quality of the paint itself.
(3) Prevention: to enhance skills, control of film thickness, the lower layer is fully dry before applying paint; selection of qualified diluent; stir; use good quality of the coatings.

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11. Wrinkling

(1) anomaly: in the construction of finish or paint dry, shrink film surface, the formation of wrinkles phenomenon.
(2) causes: excessive speed paint dry, uneven coating drying; disposable thick coating, drying table inconsistent; construction ambient temperature is too high; namely construction primer paint is not dry; improper or abnormal use of the curing agent ; bottom paint sanding uneven.
(3) Precautions: Adjust paint dry construction speed; control coating uniformly consistent, control the temperature of the environment; the underlying paint to fully dry before topcoat; choose the correct curing agent; the underlying paint polish evenly.
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12. The dry film weight of sand marks

(1) anomaly: After the painting is completed, can clearly see the underlying paint polished colored sand marks or substrate polished sand marks marks.
(2) Reason: Reverse substrate is polished; too coarse sandpaper; bottom paint is not completely dry on the polished; paint dry speed is too slow; paint coating is too thin; polished clean later, the impact of the upper wet paint.
(3) Precautions: When the substrate must be polished smooth polished grain direction; first with appropriate sandpaper, use coarse sandpaper, and back to fine sandpaper; proper use of sealer, underlying paint must be completely dry before sanding and removing the paint flour dust; use normal construction paint dry speed; as the underlying film is not enough, can be combined again primer; coat should be thick enough; periodic inspection and replacement of sanding sandpaper.

(1) anomaly: the phenomenon of the film deposited on the surface of a binder or more liquid components, exudate oily and sticky called sweating or leaking.
(2) causes: material surface treatment is not good, the substrate containing wax, mineral oil, other oils; coating is dry on the next painting or grinding together; the film has forced drying by heating, but poor ventilation.
(3) Precautions: Before spraying properly handle the material surface; to the right paint pigment to binder ratios, low resin content of paints, paint avoid high humidity and temperatures in the environment; together under the coating dry before painting or polished; heating forced drying time, while good ventilation.

14. Frost

(1) anomaly: the coating surface showing many cream-like or fine particles of smoke-like phenomenon, known as frost or fog, usually 1-2 days after spraying or weeks later, the whole or partial film the cast a mist of fine particles similar plum maturity, and often appear in the varnish.
(2) Reason: Tut Tu humidity, wind, environment polluting gases, and moisture is the main reason; often water-resistant paint will absorb atmospheric moisture accumulation in the surface fog. There are other reasons, too much change when spraying room temperature curing agent is added too much; too much with a quick-drying solvent; paint itself is the problem.
(3) Precautions: Avoid spraying in humidity, wind and other environmental carried out, but also pay attention to moisture, smoke, and other anti-gas after spraying; to keep the temperature constant; do not add too much hardener; relative slow drying of the solvent.

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