Grupo

Glosario

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.

Contacto

Sefar AG

Headquarters
Hinterbissaustrasse 12
9410 Heiden
Switzerland

Phone +41 71 898 57 00

Fax +41 71 898 57 21

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