Grupo

Glosario

Pore size

Filters are rated according to the size of particles they can remove. Particles that are bigger than the indicated pore size are removed. Smaller particles pass through the fabric. The size of particles is measured in micro-meters or 'microns', one micron being equal to one-millionth of a meter, the typical size of coal dust or flour. The smallest bacteria are about 0.5 µm.

Raster

See 'Half-tone'

Raster ruling L/cm or L/pi

The raster ruling is indicated in lines resp. dots per cm or inch. In screen printing, rasters between 5 L/cm till max. 48 L/cm can be printed, depending on the mesh used.
Guideline: the smallest dot must have a minimal diameter of two threads and one mesh opening.

Register

1: Exact congruence between original (e.g. diapositive) and the printed image
2: Multi colour printing: exact congruence between originals of the various colors and their printed images (color register)
3: Exact congruence of images at the beginning and the end of a print run, or between intermediate printings.

Residual shrinkage

The amount of shrinkage remaining in a fabric after it has undergone all fabric weaving, washing and heat setting steps.

Retentate

Substance retained in the upstream side of a filter.

RF (radio frequency) welding

Utilizes specific bands of radio frequency waves which are directed through specially constructed tooling to form localized melting/joining of certain dielectric thermoplastic materials. Can be used to form hermetic seals. Also known as high frequency or dielectric welding.

Satin weave

For satin/atlas weave, the weft passes under one warp thread and then over the next two or more. The adjacent weft thread follows the same pattern but staggered by at least two warp threads. In this way a fabric is made in which parallel weft threads predominate on the top surface and warp threads are thus mostly exposed on the bottom surface.
This results in a particularly smooth surface.

Sawtoothing

The edges of printed lines and areas are spiky. Main reason: coating thickness too small, and/or RZ value too high

Screen printing frame

Aluminium and steel are the mostly used materials for screen printing frames. Aluminium frames are less heavy and easier to handle but to give a comparable strength to steel , the cross sectional area must be enlarged. See also 'frame'

Screen printing moiré

Interference between mesh and halftone dia positive

SEFAR CARBOTEX

Precision woven screens made from carbonized threads.

SEFAR FLUORTEX

Fluorocarbon precision woven screens.

SEFAR MEDIFAB

Precision woven fabrics intended for medical applications, fabrication in clean room class 7.

SEFAR NITEX

Nylon precision woven screens

SEFAR NYTAL

Sieving fabrics for milling applications

SEFAR PASTAFAB

Dryer belts for the pasta industry

SEFAR PETEX

Polyester precision woven screens

SEFAR PROPYLTEX

Polypropylene precision woven screens

SEFAR SHRINKTEX

Shrinkable fabrics

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Sefar AG

Headquarters
Hinterbissaustrasse 12
9410 Heiden
Switzerland

Phone +41 71 898 57 00

Fax +41 71 898 57 21

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