Maliy pr. V. O., 62/2, liter A, St. Petersburg, Russian Federation, 199178

Laboratory sieves with slotted holes

INDUSTRIES

Food

 Construction

 Chemical

Pharmaceutical

 APPLICATIONS

Building materials, crushed stone, polymers, cereals, grain, animal feed.

  
 

CHARACTERISTICS

PARAMETRES

VALUES

Inner frame diameter, mm

200

300

Size of apertures in perforated plate, mm

0,8 х 20 — 35,5 х 120 

Maximum weight of sieve with perforated plate, kg

0,5

0,7

Maximum sample weight for sieve with perforated plate, kg

0,5

1

Size of slotted holes

Slotted hole*, mm

1,0х20

1,5х15

1,5х20

1,7х20

1,8х20

2,0х20

2,2х20

2,4х20

2,5х20

2,6х20

2,7х20

2,8х20

3,0х20

3,2х20

3,5х20

4,0х20

5,0х20

7 х 20

7,5х20

8 х 20

8 х 30

8 х 32

10х20

10х40

12х20

12х40

18х30

*Production of sieves with other sizes of holes is possible.

ADVANTAGES

SIEVES COMPATIBILITY

Laboratory sieves S 20/50 and S 30/50 are compatible with Ø 200 and 300 mm sieves of other brands.

NO CROSS-CONTAMINATION OF SAMPLES

The sieve frame is made of stainless steel (AISI 304). The ingress of sample particles between the frame and the screening element is excluded due to their tight fit to each other.

SIEVE SETS

Sieve sets for the required tasks can be formed.

It is recommended to use sieves as part of sieve shakers based on VP 30VP 30TVPS or VP 50 vibration drive.

It is possible to supply sieves with increased frame height or complete with intermediate rings.

SIEVES WITH PERFORATED PLATE

In S 20/50 and S 30/50 laboratory sieves, a stainless steel sheet with slotted holes is used.

The sieving element with standard holes is made of perforated sheet, other cell sizes are laser cut.

DAMPING RINGS AND EMBOSSING

The shock-absorbing sealing ring eliminates the collision of the sieves and ensures their tight connection to each other, and also facilitates the disassembly of the sieve column. Radial shoulders and embossing provide high rigidity of the sieve.

 

CALIBRATION CERTIFICATE

Production quality is confirmed by a calibration certificate.

LASER ENGRAVING

Laser engraving labeling contains the following information:

  • Sieve type
  • Opening size
  • Serial number
  • Date of production
  • Specifications
  • Frame material
  • Sieving surface material
  • Contact information

DESCRIPTION OF THE DEVICE

Laboratory sieve C 20/50 and S 30/50 consists of a frame, a sieving surface, a connecting element and a shock-absorbing sealing ring.

In the place of attachment of the sieving surface and on the upper end of the frame, radial shoulders are made, and in the middle part there is an embossing, which ensures the rigidity of the sieve.

The sieving element is tightly attached to the frame. The exclusion of cavities and gaps in which particles of material can accumulate reduces the risk of cross-contamination of samples, improving the quality of the sieve analysis.

Labeling is performed by laser engraving.

The shock-absorbing sealing ring eliminates the possibility of impacting the ends of the sieves and provides a tight connection between the sieves, with the intermediate rings, trays and covers.

Types of perforated plates:

  • Plates with zone perforation;
  • Laser cut plates.

OPERATING PRINCIPLE

The sieve analysis is performed using one or more sieves, a tray and a cover. The number of sieves, as well as and shape of the perforated plate apertures are determined by the conditions of the analysis.

The sieve column can be equipped with intermediate rings to increase the height of the sieve, which allows loading larger samples onto the sieve, as well as intermediate trays for installing several sets of sieves in one column.

The material to be sieved is loaded into the upper sieve. The sieve column complete with tray and cover must be shaken manually or using a VP 30VP 30TVPS or VP 50 vibration drive. Using the vibration drive allows to increase productivity of sieving due to high-frequency reciprocating screw oscillations of the platform on which the column of sieves is fixed.

Particles of material which are smaller than the size of the sells / apertures in the sieving surface of the upper sieve fall through on the next sieve, where the cycle repeats. As a result, the sample is distributed between the sieves and the tray in accordance with the fractional content. At the end of the sieving process, the contents of each sieve are weighed and the particle size distribution of the sample is determined.

S 30/50 sieve scheme

Zone perforation plates

Laser perforation plates

Intermediate tray, intermediate ring, cover, tray, and shock-absorbing sealing ring