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Plastic color matching specific steps, listen to senior engineers give you analysis

Company News > Plastic color matching specific steps, listen to senior engineers give you analysis

According to the given conditions, including the type of plastic, plastic products, plastic molding process. The use of plastic products also includes light resistance and weather resistance, migration, covering power, transparency, aging resistance, toxicity (heavy metals), food hygiene (FDA), acid and alkali resistance, solvent resistance, mechanical strength, thermal properties, electrical properties, etc..

Set items including colorant shape, color matching, colorant, selection (including the amount of additive, colorant variety selection), design formula, repeated color matching test, colorant variety selection after color matching, including weather resistance, dispersity, deformation, filter, migration, heat sealing, safety, coloring cost.

1, first understand the sample requirements

Plastic type of the sample;

Plastic use of the sample;

Sample forming process.

According to the above three conditions can understand the product selection of colorant needs to meet the requirements (heat resistance, light resistance, weather resistance, resistance to migration, safety). In addition, color matching personnel also need to confirm the customer requirements of the colorant dosage form (pigment dry powder, color masterbatch, sand, modified material), the customer requirements of the coloring proportion (add) to confirm.

2. Design the preliminary formula according to customer requirements

The selection of pigments. According to the sample of transparent, opaque or translucent colorant selection.

Comprehensive consideration of coloring cost. Cost is also a very important consideration, the price of the paint is as important as the performance of the paint.

Draw up a preliminary recipe. After repeated research, from the hue, brightness, shade and other aspects of repeated comparison with the standard color sample and reference differences, on this basis, the reference colorant formula was revised, the preliminary formula was drawn up. In the absence of reference, plastic products (samples) should be carefully analyzed color light, tone and brightness, determine color attributes, and then according to the Munsell color system color matching, and formulation.

3, repeatedly adjust small sample as close as possible to the customer sample

At present, the plastic matching method used by various enterprises is actually a trial and error method, which is not very scientific, but it is still very recognized in the color matching of the plastic industry, which is widely used by most enterprises.

Color matching personnel in accordance with the preliminary formulation of the physical coloring test, the actual coloring sample and the standard color sample and reference together for comparison, further adjust the coloring formula. Then the samples were prepared according to the adjusted formula for comparison.

4, color comparison

The color comparison between samples and samples provided by customers is a very important part of color matching. According to the customer sample production process to make samples for comparison, film products are often compared by blowing film method, injection products by injection method, fiber products by spinning method.

(1) The influence of light source

It is better to use natural light source for visual inspection. If possible, standard light source box can be used. Otherwise, the color of the two samples may look the same due to the phenomenon of "heterochromia" under some lights, but there is a large color difference under natural light.

(2) The influence of thickness

Different thickness of the product to the human eye feeling is not the same; Small thickness is more transparent, the color becomes lighter, so the color matching should try to make the sample and customer sample thickness is consistent, can not be consistent can be roughly speculated.

(3) Influence of surface state

Different surface of its light reflection is different, such as on the same sample, the color of the matte surface of the high gloss surface obviously gives a person different feeling, on the same sample, rough surface is deeper and darker than smooth surface, so the colorimetric observation should be compared with similar parts of the surface as far as possible.

(4) the influence of resin

The same pigment is applied in different resins with different colors, which is caused by different natural color and transparency of resins, so color matching should pay attention to the use of resins provided by customers for color matching to ensure the accuracy of color, especially the color matching of modified materials.

(5) colorimetric judgment error

In the process of checking the most likely problem is colorimetric error, error of judgment is mainly caused by lack of experience, usually can only be solved by constant practice, constantly rich experience, appropriate use of some instruments such as colorimeter can also help correct judgment.

5. Heterochromia

A pair of samples are made from different colorants. They match colors when viewed by a particular observer under a particular light source.

If the lighting changes, the object will no longer match. Heterochromatism is a common and sometimes unpleasant phenomenon, but it makes it possible to match many different pigments. Toxic colorants can be replaced with non-toxic ones.

Expensive colorants can be replaced by cheaper colorants to reduce costs. Because of the phenomenon of heterochromia, it is possible to reformulate a formula using different colorants. Colorists can assign coordinates to items in a color space so that they match colors, even though they are made of different colorants. The only way to eliminate the conditional color matching of objects is to use the same colorant.

Source: Green plastic additives

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Plastic color matching specific steps, listen to senior engineers give you analysis

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