Concepts and terminology
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Concepts and terminology

This section gives the basic concepts and terminology of industrial screens parts, which are commonly used in the following chapters. Terminology is also completed with methods of fixing the screens into the sorting machines.

The basic building block of wire screens are called warp wires. This refers to creped wires that make up the length of the screen. In harp screens they are the wires that form the active surface. In contrast, the weft wires are those that form the width of the screen. Creping of the screen means waving of warp and weft wires by creping devices prior to their involvement.

The most commonly used wire materials:

Title

STN

DIN

AISI

a) spring steel class. 12

 

 

 

 

12040, 12050

cca 1.0500 (DIN 17223)

 

b) stainless steel

 

 

 

X 5 Cr Ni 18 9, X 5 Cr Ni 18 10

17240

1.4301

304

X 12 Cr Ni 18 8

pribl. 17241

1.4310

301

X 15 Cr Ni Si 25 20

17255, 17265

1.4841

314

X 6 Cr Ni Ti 18 10, X 10 Cr Ni Ti 18 9

17247, 17248

1.4571

312

X 6 Cr Ni Mo Ti17 12 2,X10 Cr Ni Mo Ti 18 10

17347, 17348

1.4541

316 Ti

X 22 Cr Ni Si 25 20

 

1.4845

310

In the production of metallic screens there is used either abrasion resistant rubber blend in the range of hardness from 35 to 65 Shore or polyurethane elastomer type A and D in the range of hardness from 32 to 90 Shore. Sieves are supplied in rolls (wire screens) or the formats (wire screens, harp screens, metal screens).