What Is Crimp in Wire Screens?

A crimp is a controlled bend or corrugation formed into wire before or during weaving that locks wire intersections in place, maintains consistent screen apertures, and gives woven wire cloth the structural rigidity needed for vibratory screening applications. Every woven wire screen used in a vibratory separator relies on some form of crimping to keep the mesh stable under the constant vibration, material impact, and tension that occur during operation.

Without crimping, woven wire would behave like loose fabric — the wires would shift position at every intersection, openings would become inconsistent, and the screen would fail to provide accurate particle separation. The crimp acts as a mechanical interlock at each junction, preventing wire migration and ensuring the aperture (opening) remains the same from edge to edge across the entire screen surface.

Common Crimp Types Used in Vibratory Screening

Why Crimp Matters in Vibratory Screening

Crimp type directly impacts three critical aspects of vibratory screening performance:

• Aperture accuracy — Proper crimping ensures every opening across the screen surface is within tolerance. In quality-critical applications like pharmaceutical grading or food safety screening, aperture consistency determines whether the product meets specification. Inconsistent crimps mean inconsistent openings, which means inconsistent product.
• Screen stability under vibration — Vibratory separators from Sweco, Kason, Midwestern Industries, Cleveland Vibratory, and other OEMs operate at 1,200-1,800 RPM. The screen must maintain its structure under this constant motion plus the weight and impact of the material being processed. The crimp provides the mechanical interlock that keeps the mesh stable.
• Blinding resistance — The shape and depth of the crimp affect how near-size particles interact with the screen surface. Flat top crimp creates a smooth upper surface that allows particles to slide across rather than wedging into the openings, reducing blinding.
• Open area — Deeper or more frequent crimps consume wire length, which can reduce the open area percentage and therefore throughput. Selecting the minimum crimp needed for stability maximizes production capacity.

Related Glossary Terms

• Pre-Crimped Wire — Wire crimped before weaving for uniform openings
• Intercrimp / Lock Crimp — Extra crimps between intersections for maximum rigidity
• Flat Top Weave — Crimp style creating one smooth screening surface
• Plain Weave — Over-one, under-one weave pattern
• Aperture — The opening size in a woven wire screen
• Wire Diameter — The thickness of the screen wire

Crimp FAQs

What does crimp do in woven wire screens?

Crimp serves three essential functions in woven wire screens: it locks each wire intersection in place so the wires do not shift during vibration, it maintains consistent aperture (opening) sizes across the entire screen surface, and it adds rigidity to the overall screen structure. Without crimping, the wires in a woven screen would slide freely at intersections, producing inconsistent openings and poor screening performance.

What is the difference between pre-crimped and plain crimp wire mesh?

Pre-crimped wire is crimped (bent at regular intervals) before it is woven into cloth, ensuring every intersection has a uniform, controlled bend. Plain crimp forms the bends during the weaving process itself. Pre-crimped wire produces more consistent apertures in coarse mesh sizes and is the standard for vibratory screening applications from approximately 2 mesh to 30 mesh.

Does crimp type affect screening performance?

Yes. The type and depth of crimp directly affects open area percentage, blinding resistance, and screen stability. Deeper crimps lock wires more securely but reduce open area. Intercrimp adds extra crimps between intersections for maximum rigidity. Flat top crimp creates a smooth surface that reduces blinding. The right crimp type depends on the material being screened, the mesh size, and the operating conditions.