A nylon screen is a woven mesh screen cloth made from polyamide (PA) monofilament or multifilament yarn, used in vibratory screeners to eliminate metal contamination risk, reduce product damage, and provide chemical resistance in food, pharmaceutical, and specialty chemical screening applications. Nylon mesh is the most widely used synthetic screen material in vibratory screening, offering a metal-free alternative to stainless steel screen cloth when product purity, gentle handling, or specific chemical resistance requirements make metallic screens unsuitable.
Nylon screen cloth is woven from precision-extruded monofilament yarn, most commonly Nylon 6 (PA6) or Nylon 6/6 (PA66), with thread diameters and mesh counts engineered to match standard screen specifications from approximately 10 mesh to 500 mesh. The monofilament construction provides smooth, non-fibrillating filaments that minimize particle adhesion and simplify cleaning. Nylon mesh is bonded to standard screen frames for installation in Sweco, Kason, Midwestern Industries, ScreenerKing, and other round vibratory separators using the same frame systems as wire cloth screens.
Nylon Screen Properties
| Property | Nylon (PA66) | 304 SS (Comparison) |
|---|---|---|
| Material Type | Polyamide polymer | Austenitic stainless steel |
| Metal Contamination Risk | None | Wire breakage possible |
| Tensile Strength | 70–85 MPa | 515–620 MPa |
| Moisture Absorption | Up to 8% (PA66) | None |
| Max Service Temperature | 120°C (250°F) | 870°C (1,600°F) |
| Acid Resistance | Poor (attacked by strong acids) | Good |
| Alkali Resistance | Good | Good |
| FDA Food Contact | Yes (21 CFR 177.1500) | Yes |
| Abrasion Resistance | Good (self-lubricating) | Moderate |
| Cost Index vs. 304 SS | 0.3–0.6x | 1.0x |
Why This Matters in Vibratory Screening
Nylon screen offers distinct advantages in applications where metal contamination prevention, gentle product handling, or cost reduction outweigh the need for the tensile strength and temperature resistance of stainless steel.
- Zero metal contamination — In food and pharmaceutical processing, broken screen wire is a serious contamination hazard. Nylon screens eliminate this risk entirely. Any screen fragments that enter the product stream are non-metallic and will not trigger metal detectors, though they are detectable by X-ray inspection systems.
- Gentle product handling — Nylon's lower surface hardness and inherent flexibility cause less breakage of fragile particles. Spray-dried powders, coated tablets, delicate granules, and friable materials maintain their particle integrity better on nylon mesh than on wire cloth.
- Anti-blinding properties — Nylon's natural flexibility and slight elasticity create micro-movement during vibration that helps dislodge near-size particles from the apertures, reducing blinding compared to rigid wire cloth in certain applications.
- Limitations — Nylon absorbs moisture, which changes mesh dimensions and can promote microbial growth in food applications. It cannot withstand temperatures above 120°C or exposure to strong mineral acids. Its lower tensile strength means shorter screen life under abrasive conditions compared to 304 SS.
Related Glossary Terms
- Polyester Screen — PET mesh alternative with lower moisture absorption
- Polypropylene Screen — PP mesh for acid-resistant, low-cost screening
- PTFE Screen — Teflon-coated mesh for non-stick screening
- 304 Stainless Steel — Standard metallic screen material for comparison
- Screen Cloth — The filtering surface material in vibratory screeners
- Blinding — Clogging of screen openings, which nylon resists in some applications
Nylon Screen FAQs
Why use nylon screen instead of stainless steel in vibratory screening?
Nylon screen eliminates the risk of metal contamination from broken screen wire — a critical concern in food, pharmaceutical, and cosmetic processing. If a nylon screen fails, the fragments are non-metallic and detectable by X-ray inspection systems. Nylon also provides gentler product handling, reducing particle breakage of fragile materials like spray-dried powders, granules, and coated tablets.
What are the limitations of nylon screen?
Nylon screen absorbs moisture (up to 8% by weight), which can cause dimensional changes in the mesh openings and promote mold growth in food applications if not properly dried between uses. It has lower tensile strength and abrasion resistance than stainless steel, resulting in shorter service life under demanding conditions. Nylon also has a lower maximum operating temperature (approximately 120°C) compared to stainless steel (870°C) and is attacked by strong acids.
Is nylon screen FDA approved for food contact?
Yes. Nylon (polyamide) is FDA compliant for food contact under 21 CFR 177.1500 and is widely used in food processing vibratory screening. It meets EU food contact regulations (EU 10/2011) for plastic materials. Nylon screen is commonly specified for sifting flour, sugar, spices, dairy powders, and other food ingredients where metal-free screening is preferred.
Order Nylon Mesh Replacement Screens
ScreenerKing supplies nylon mesh replacement screens for metal-free vibratory screening in food, pharmaceutical, and chemical applications — compatible with Sweco, Kason, Midwestern Industries, and other OEM separators. Pre-tensioned and bulk mesh available.
