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Key Quality Indicators for Nonwoven Fabrics
2026-03-03
I. Basic Physical Indicators
These are the fundamental parameters for evaluating nonwoven fabrics.
1. Basis Weight
Definition: Mass per square meter of nonwoven fabric, unit: g/m².
Significance: The most intuitive indicator. Under the same material and process, higher basis weight means thicker and more durable material, but may reduce air permeability and increase cost. For example, nonwoven fabrics for shopping bags usually have high basis weight, while those for the inner layer of disposable masks are much thinner.
(Nonwoven Fabric Basis Weight Tester)
2. Thickness
Definition: Vertical distance between the upper and lower surfaces of the fabric under specified pressure, unit: mm.
Significance: Directly affects hand feel and bulkiness. It is closely related to basis weight but not strictly proportional, as it is also influenced by fiber arrangement and manufacturing process.
II. Mechanical Properties
These indicators determine the strength and durability of nonwoven fabrics.
1. Tensile Strength & Elongation at Break
Definition: Tensile strength is the maximum force a specimen can bear before breaking per unit width; elongation at break is the percentage change in length when the specimen breaks.
Significance: Directly reflects the toughness of the material. Nonwoven fabrics used for heavy-duty applications require high tensile strength.
2. Tear Strength
Definition: Force required to propagate an existing tear under external force.
Significance: Particularly important for products prone to tearing (e.g., protective clothing). High tear strength ensures the material is not easily torn, improving safety.
3. Bursting Strength
Definition: Ability of the fabric to resist rupture under overall expansion force.
Significance: Reflects fiber bonding density and overall strength. It ensures the product does not break under deformation (e.g., load-bearing shopping bags, stretched protective clothing), making it a core mechanical quality indicator.
III. Functional & Comfort Indicators
These determine practical performance and user experience.
1. Air Permeability
Definition: Ability of air to pass through the material.
Significance: A key indicator for hygiene and medical products (masks, surgical gowns, sanitary products). Good air permeability improves comfort and reduces stuffiness.
2. Moisture Vapor Transmission & Hydrostatic Pressure Resistance
Definition: A pair of related indicators. MVTR is the ability of vapor to pass through; hydrostatic resistance is the ability to resist liquid water penetration.
- High MVTR: Essential for surgical gowns and protective clothing to discharge sweat and keep dry.
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High Hydrostatic Resistance: Required for barrier products (isolation gowns, agricultural fabrics) to block blood, alcohol, rainwater, etc.
(Hydrostatic Pressure Tester)
3. Softness
Definition: Subjective tactile property, evaluated by hand or professional instruments.
Significance: Products in direct contact with skin must have good softness to ensure comfort and skin-friendliness.
IV. Appearance & Color
1. Uniformity
Definition: Uniformity of basis weight, thickness and fiber distribution.
Significance: Poor uniformity causes uneven patches, leading to inconsistent mechanical and functional performance. It is an important measure of production quality.
2. Color Fastness
Definition: Resistance of dyed or colored fabrics to fading or staining under friction, washing, perspiration, etc.
Significance: Poor color fastness may cause color transfer, affecting appearance and even causing skin irritation, especially for decorative and lining fabrics.
Summary
Quality evaluation of nonwoven fabrics is comprehensive and depends on the end-use application. For example, high-quality nonwoven for surgical masks requires moderate basis weight, good air permeability and safe pH value.
Understanding these key indicators supports scientific quality evaluation, and provides a solid technical basis for product design, material selection and purchasing decisions.