Pigments Test Sieve

What is a Pigments Test Sieve?

Pigments test sieve is a device used for screening and grading pigments particles. It is usually used in laboratories or small-scale production to test the screening and grading of pigments particles. The design and principle of this pigments test sieve are similar to large-scale screening equipment in industrial production, but on a smaller scale and for more experimental and research purposes.

Video of Pigments Test Sieve

What is the function of Pigments Test Sieve?

① Particle size distribution: Determine the size range of pigments particles (such as <45μm accounts for 90%), which affects dispersibility, hiding power and color uniformity.

② Fineness detection: Determine the fineness of the pigments after grinding (such as the percentage passing through a 325 mesh sieve) to ensure that the application standard is met.

③ Impurity removal: Screen out oversized particles or foreign matter to avoid affecting the appearance and performance of the final product.

Working principle of pigments test sieve

Pigments test sieve uses vibration force to make the sieve body and the screen vibrate, and the pigments particles are screened on the screen.

The pigments particles are divided into particles of different sizes according to the aperture size of the screen, thereby achieving the screening and grading of pigments particles.

Applicable materials for pigments test sieves

Material type	Common applications	Remarks
Inorganic pigments	Red iron oxide, yellow iron oxide, titanium dioxide, carbon black, ultramarine, etc.	Widely used in coatings, plastics, inks, ceramics and other industries
Organic pigments	Phthalocyanine blue, phthalocyanine green, azo pigments, quinacridone pigments, etc.	Widely used in coatings, plastics, inks, textiles and other industries
Metallic pigments	Aluminum powder, copper powder, zinc powder, etc.	Widely used in anti-corrosion coatings, metal coatings, printing inks and other industries
Fluorescent pigments	Phosphor, luminous powder, etc.	Widely used in safety signs, Advertising, special coatings and other industries
Pearlescent pigments	mica titanium pearlescent pigments, glass pearlescent pigments, etc.	widely used in automotive coatings, cosmetics, plastic products and other industries
Dyes	acid dyes, alkaline dyes, reactive dyes, etc.	widely used in textiles, leather, paper and other industries
Color fillers	talcum powder, kaolin, calcium carbonate, barium sulfate, etc.	widely used in coatings, plastics, rubber, papermaking and other industries
Other powdered materials	ceramic powder, metal powder, food powder, pharmaceutical powder, etc.	suitable for various powdered materials that require particle size analysis

Classification of pigments test sieves

1. Single-layer test sieve

Structural features: single-layer sieve, usually round or square, with a common diameter of 200mm or 300mm, equipped with a single mesh sieve (such as 325 mesh, pore size 45μm).

Function: used for single-target screening, such as detecting pigments fineness or removing oversized particles.

2. Multi-layer test sieve (double or triple layer)

Structural features: 2-3 layers of sieves are stacked, with decreasing mesh numbers (such as 100 mesh on the upper layer, 200 mesh on the middle layer, and 325 mesh on the lower layer), which can be driven by a screening machine (such as a vibrating screen or a swinging screen).

Function: Simultaneously achieve grading and impurity removal, and separate a variety of particle size ranges.

3. Wet screening test sieve

Structural features: single or multi-layer sieves, the sieve material is corrosion-resistant (such as stainless steel).

Function: Through water washing and screening, it can handle pigments that are easy to agglomerate or contain moisture.

Type	Number of screen layers	Screen surface size	Screening capacity	Common mesh	Power
Single-layer screen	1	1m×2m	1-15t/h	100-400 mesh	1.5-3kW
Double-layer screen	2	1.5m×2.5m	2-20t/h	50-325 mesh	2.2-5kW
Multi-layer screen	3	2m×3m	3-25t/h	50-400 mesh	3-7.5kW

The structure of pigments test sieve

Pigments test sieve is usually composed of the sieve body (sieve frame), screen mesh, vibration mechanism, feed port and discharge port, support structure, base and other main parts. These parts together constitute the structure of pigments test sieve, and through collaborative work, the screening and grading of pigments particles can be achieved.

What are the advantages of pigments test sieve?

1. Handling small pigments particles that are easy to clog the screen

Pigments particle size is often <45μm (such as titanium dioxide), which is easy to embed into the sieve hole. Pigments test sieve is equipped with a bouncing ball to vibrate the screen to remove the blockage. When screening carbon black, the blockage rate can be reduced from 15% to 2%.

2. Easy to agglomerate and affect the screening accuracy

Pigments (such as ultramarine) agglomerate after absorbing moisture and are difficult to disperse. Wet screening is done by washing with water or pre-drying the material. For example, after wet screening of ultramarine pigments, the screening accuracy is increased to 98%.

3. The particle size distribution of pigments particles is complex

Pigments particle size range is wide (such as 1-100μm), and multi-stage separation is required. Pigments test sieve adopts a multi-layer screen design and one-time classification. For example, when screening and recovering pigments, the three-layer sieve divides the particles into three specifications to meet different uses.

4. Prevent dust from flying and polluting the environment

When dry screening pigments (such as iron oxide yellow), fine powder is easy to generate dust. Pigments test sieve adopts a fully enclosed design. When screening 1 ton of pigments, the dust collector controls the dust concentration below 0.3mg/m³.

Recommended mesh number for pigments test sieves

Low mesh number (50-150 mesh): suitable for pigments with larger particle size (such as fluorescent pigments, metallic pigments), screening coarse particles or grading.

Medium mesh number (150-325 mesh): suitable for most pigments (such as iron oxide, ultramarine), balancing fineness and efficiency.

High mesh number (325-500 mesh): used for ultrafine pigments (such as carbon black, silica), testing fineness or removing dust.

Technical parameters of pigments test sieve

Item	Parameter/Specification	Description
Screen aperture	20 microns-several millimeters	Select according to the particle size of pigments particles
Screen material	stainless steel, brass, nylon, etc.	corrosion-resistant, wear-resistant, adapted to pigments characteristics
Screen frame size	diameter 200 mm, 100 mm, etc.	Select according to screening requirements
Screen frame material	stainless steel, brass, plastic, etc.	corrosion-resistant, wear-resistant, adapted to pigments characteristics
Bottom cover and top cover	stainless steel, plastic, etc.	prevent pigments particles from splashing and leaking
Sealing ring	rubber, silicone, etc.	ensure that pigments particles do not leak during screening
Number of screening layers	1-5 layers	multi-layer screens can be customized according to screening requirements
Screening accuracy	conform to international standards such as ISO and ASTM	ensure the accuracy and repeatability of screening results

Comparison table of mesh number and aperture of pigments test sieve

Mesh number	Aperture (micrometer)	Applicable material particle size range (micrometer)
20 mesh	850	500-850
40 mesh	425	250-425
60 mesh	250	150-250
80 mesh	180	100-180
100 mesh	150	75-150
120 mesh	125	60-125
140 mesh	106	50-106
170 mesh	90	45-90
200 mesh	75	38-75
230 mesh	63	32-63
270 mesh	53	25-53
325 mesh	45	20-45
400 mesh	38	15-38
500 mesh	25	10-25
635 mesh	20	5-20

What is pigments test sieve used for?

The application scenarios of pigments test sieve in the pigments industry are very wide, covering multiple links such as particle size analysis, quality control, application research, production process improvement, and R&D experiments. Its high-precision screening and other characteristics can effectively solve the problems faced by pigments particles in the production and application process, and it is an indispensable key equipment in the pigments industry.

Precautions for pigments test sieve

1. When selecting a pigments test sieve, it is necessary to select a suitable mesh aperture and screening method according to the particle size range, properties and test requirements of the material.

2. For materials that are easy to agglomerate, sticky or have strong static electricity, it may be necessary to use ultrasonic test sieves or add antistatic agents and other auxiliary measures.

3. Before screening, pigments should be pretreated, such as drying and crushing, to ensure the accuracy of the screening results.

4. After screening, sieve should be thoroughly cleaned to prevent cross-contamination of samples.

Customer Cases of Pigments Test Sieve