Paint class: How to control the color difference of the paint film

China Paint Network
News: Color, also known as color, is a variety of phenomena of light (such as red, orange, purple, etc.), is to allow people to distinguish between the size, shape or structure of the exact same object visual or percessive phenomena, is the brain through the eye and visual nerves stimulated by the feeling. The light reflected from the incoming light to the surface of the object produces electrical impulses that are fed back to the brain, forming colors when the properties of the object and the properties of the light source work together.
the size, shape, or structure of the object, a beam of incoming light shines on the surface with different results. The light that is fired into an object may be partially or completely reflected, partially or completely absorbed, or partially or completely reflected. If the white surface reflects all wavelengths of incoming light, the black surface absorbs all wavelengths of incoming light, and the green surface reflects only the green ray portion of the incoming light, while absorbing other parts of the ray.
the same object is exposed to different light sources, different colors appear. Normal human eyes can distinguish more than 1 million different colors, it is easy to distinguish between similar or similar colors, and color-blind patients can not distinguish between the natural spectrum of various colors or a certain color, and the poor ability to distinguish color is called color weakness, it and color-blind boundaries are generally not easy to strictly distinguish, but the degree of light is different.
1 Paint film color display method
1.1 tonal method
GB/T3181-2008 is applicable to color paint and related products production and use departments, the preparation and selection of color guidance, it provides the color standard of paint film and its use method, it should be combined with GSB05-1426-2001 paint film color standard sample card used together.
paint film color is indicated by number plus name. The number consists of one or two English letters and two Arabic numerals. English letters indicate tones, and Arabic numerals represent different colors of the same hue. Each color has a national uniform standard number: such as PB11 peacock blue, PB10 days (iron) blue, GY09 ice ash, R03 red and so on.
hue refers to which wavelength is dominant in the light reflected by the object, different wavelengths produce the feeling of different colors, tone is an important feature of color, which determines the fundamental characteristics of color essence. The hues consist of 5 main shades of red (R), yellow (Y), blue (B), purple (P), green (G), and these five adjacent shades of yellow (YR), green (GY), blue and green (BG), purple (PB), red and purple (RP). Each tonal range also includes several colors, such as gray tones including 5 colors: B01 dark gray, B02 medium gray, B03 light gray, B04 silver gray, B05 sea ash.
GB/T3181-2008 includes 83 colors of the main color paints currently commonly used. GSB05-1426-2001 specifies a standard sample card for these 83 colors.
1.2 CIE tricolor marking system data method
in GB/T6749-1997 specified the method of representing the color of the paint film, it is the International Lighting Commission (CIE) provisions of the instrument measured by the tricolor marking system data. Color coordinates are made clear by three vector values perpendicular to each other.
paint film color can be represented by one of the following three CIE tricolor label system data:
(1) with three stimulus values X, Y, Z,
(2) with stimulus value Y and color coordinates, X, Y indicates;
(3) is represented by CIE uniform color spatial color coordinates L, a, b, and
three stimulus values are the amount of three primary stimuli required in a tricolor system to match the color to be measured. CIE1931 standard color system, i.e. 2-degree field-of-view chroma system, expressed in X, Y, Z. CIE1964 complements the standard chroma system, the 10-degree field-of-view color system, expressed in X10, Y10, and Z10.
three stimulus values are called chromo-coordinates when compared to their time. In the CIE system, the excellent coordinates x, y, z:
x x / (X-Y-Z)
y-Y/(X-Y-Z) can be calculated by three stimulus values X, Y, Z
the uniform color space recommended by CIE in 1976 is called CIE1976L, a, b
, and color space. The space is a three-dimensional right-angle coordinate system that represents the position of the color in the color space in the lightness L and chroma coordinates, a, b, and color. The values X, Y, and Z can be adjusted by the three stimulus values X, a, and b.
the color of the paint film is determined by this method, it is carried out using a specified spectral photometer or photoelectrometer. First correct the color meter, and then under the D65 light source, 10 degrees field of view, determine the spectral photometric characteristics of the paint film, each sample measured 5 points, and then average, and then calculate the three stimulus values X10, Y10, Z10. Three stimulus values X10, Y10 and Z10 can also be directly determined using a three-stimulus chromometer.
2 Mountain push paint paint film color standard
3 paint color difference and gloss control standard
3.1
paint

the color difference between the 3.1.1.1 batch slab and the standard plate is≤
E≤0.5; 0.5;
3.1.3 batch stylus gloss (60 projection angle) conforms to: highlight paint ≥85%; semi-matt paint specified gloss ±10.
3.2 Paint supply side to ship with a product inspection report and two batches of schromets for the paint purchase acceptance inspection.
3.3 After receiving the inspection report and the model, according to GB/T9761-1988 "color paint and varnish visual contrast" to visually see whether the batch slab brought by the supply side is consistent with the standard color plate, visual inspection did not have a more obvious color difference, color testing with chromaometer. The batch slabs brought by the inspection paint supply should meet the following requirements: the chroma difference between the
3.3.1 batch slab and the standard plate E≤1.±≥
0;
3.4 The batch sci-slab brought by the paint supply side meets the requirements, and then randomly selects the inspection batch paint spray plate inspection, the self-spray plate inspection meets the following requirements:
3.4.1 batch sampling from the color difference between the spray plate and the standard
plate E≤1.0; 3.4.2 batch sampling from the color difference between the spray plate and the upper batch sci-off plate≤ E≤1.0;
3.4.3 batch sampling from the spray plate gloss (60 projection angle) conforms to: high-gloss paint ≥85%;;
3.5 After the acceptance of the purchase of paint, in the coating and construction process sprayed on different substrates (mainly blasting substrates and acid-washed phosphate substrates) on the paint color difference and gloss detection standards are as follows:
3.5.1 acid-washed phosphates (cab, hood, The color difference between the tank, cab apron, etc., and the standard sint control is E≤1.5;
3.5.2 blast parts (mainly thick plate welded structural parts) and other components and standard schromette color difference control is E≤2;
3.5.3 gloss (60 projection angle) conforms to: high-gloss finish ≥8±5%;
4 Responsibilities and Permissions
4.1 Technical department is responsible for the development of the opposite paint color difference and gloss control standards, is responsible for the archiving of standard slabs, regular updates (valid for one year), is responsible for the internal coating requirements of the department sables Issued, archived, and regularly updated (valid for one year) to provide the basis for the color inspection of the appearance of products produced by coating and assembly,
4.2 Procurement Management is responsible for requiring paint suppliers to provide standard slabs, paint inspection reports and batch spads
4.3 The inspection department is responsible for comparing and confirming the sci-visual plates that should be used when comparing the self-inspection (the appearance color of the coating product is required), and
4.4 the purchasing department is responsible for the distribution, archiving, and periodic distribution of the scissers of suppliers who have purchased the painted products from the company Update (valid for one year);
5 standard sci-slab use
departments using standard sci-visual inspection of infested materials, coating, assembly of the appearance of color, visual inspection-based, chroma meter measurement as a supplement, visual judgment qualified is qualified. In the visual color ratio requires the use of W45 to W60 light source, distance from the object under test 30 to 50CM, there is no color object around the reflected visual time of 30 seconds. Place the appliance on the same plane as the standard slab, wear gloves when using the standard slab, and do not touch the front of the standard schromette with your bare hands.
5.1 Replacement and recycling of standard slabs
There are generally two cases of replacement of standard spades: First, standard spads cause damage, loss or color deviation during use. Due to the high quality requirements of standard spads and the low pass rate for one-time production, the number of spads produced successfully per batch is limited. Protection of standard slabs must be strengthened to reduce damage caused by abnormal use. Second, the standard slab is over-valid or the standard slab of this batch is used up. Standard slabs must be made in the same batch, do not allow multi-batch mixing, after the release of new batches of standard spades, the old batch must be recycled scrap.
5.2 Custody and calibration of standard slabs
Standard spades may change color during use due to sunlight exposure, contamination in use or improper preservation, and the following requirements are required for the storage of standard syllabs:
5.2.1 syllabs need to be stored in a special plastic bag package to prevent contamination and bruising
; 2.2 The quasi-scissor must be managed by a person, without the consent of the administrator, no one else may take access to it,
5.2.3 Departments or foreign manufacturers must check the standard sciSM color once a month,
5.2.4 sci-color plate users from the date of receipt of the standard sci-chroma board every 3 months must go to the standard sci-color board management department for calibration. Calibration requires a visual match between the standard slab and the standard slab stored by the scuette management, and the standard slab is measured with a color difference meter
, and then compared to the chroma difference between the measured value and the sint label;
6 Note
6.1 slab label is the symbol of the standard slab, so the standard slab label is not allowed to be altered or replaced without authorization. The sampler's signature requires handwriting and, if necessary, a stamp on the label. If the label is damaged, contact the technical department for replacement.
6.2 Standard Schrome Use Department should immediately stop using standard spad color deviations during use and contact the Technical Department for schrome replacement.
6.3 Standard Schromette in the use of the process, in the event of color disputes, can organize the relevant departments and
coatings
and external co-parts suppliers to jointly judge.
7 Summary
With the change of people's consumption concept and the improvement of aesthetic standards, the appearance quality of construction machinery products are developing in a direction that gives people a good sense of vision and psychology. The appearance quality of construction machinery products is also developing in a beautiful direction, but in addition to the improvement in the shape design, the quality of product surface coating is also more and more attention by consumers. Through the implementation of the digital standard of paint film color, the management and application of standard slab, we can control the color difference and gloss of paint film very well.