Cutting Challenges & Optimized Solutions for Nonwovens

Jul 04, 2026

There are various types of nonwoven fabrics, including spunlace, needle-punched, spunbond, melt-blown and impregnated nonwovens. They feature fluffy texture, non-woven random fiber structure, strong ductility and susceptibility to melting, resulting in obvious differences in cutting challenges compared with corrugated paper. The following is organized in the structure of pain points, root causes and corresponding solutions.

Edge melting, adhesion and hardening (most common in thermal cutting)

Causes

1.Synthetic nonwovens (PP, PET) have low melting points. During thermal cutting, fibers at the cutting edge melt and agglomerate, resulting in hardened and bonded cut edges.

2.Excessively high thermal cutting temperature or low line speed leads to accumulated heat that scorches the fabric surface and causes material damage.

3.Long-term heating of the cutting blade continuously bakes the cutting zone.

Solution Measures

1.Cutting method selection switching: For chemical fiber nonwovens, cold cutting (pneumatic slitting with circular knives or flat knives) is prioritized instead of hot cutting. Hot cutting is only adopted for edge sealing to prevent filament shedding.

2.Hot cutting process optimization: Precisely control temperature and increase line speed to avoid heat accumulation. Equip blades with air cooling structures to lower continuous blade edge temperature.

3.Apply Teflon coating on cutting edges to reduce adhesion of melted fibers.

3.Cotton and blended nonwovens are not prone to melting, so normal-temperature mechanical cutting can be applied directly.

Frayed edges, lint, fiber pulling and debris generation

Causes

1.Fibers of nonwoven fabric are randomly overlapped. Dull blades tear fibers apart rather than cutting them cleanly.

2.Needle-punched nonwovens feature fluffy fibers with poor cohesion, so edge fibers tend to separate under stress.

3.Excessive clearance between upper and lower knives leads to incomplete shearing.

Solutions

Adopt high-precision cemented carbide blades to maintain ultra-sharp cutting edges, and regularly resharpen them with diamond abrasives to achieve clean cutting instead of fiber tearing. Accurately control the clearance between upper and lower knives: set the clearance at 0.01~0.03 mm for thin nonwovens, and adjust it to 0.03~0.06 mm for thick needle-punched fabrics.

Slight hot-pressing shaping can be carried out before cutting to improve fiber cohesion and reduce edge fraying; the moisture content of spunlace nonwovens can be appropriately adjusted to enhance fiber toughness.

Install a negative pressure dust extraction unit on the machine to continuously remove lint and dust generated during cutting.

Stretching deformation, unstable width dimension, skewing and offset during cutting

Causes

1.Nonwoven fabrics are soft and highly extensible. Excessive unwinding tension tends to stretch the material and narrow its width; fluctuating tension leads to out-of-tolerance width of finished products.

2.Uneven thickness and irregular roll ends of fluffy fabric cause lateral deviation during high-speed slitting.

3.Uneven pressure of pressing rollers results in skewed stress on incoming material.

Solutions

1.Equip a constant tension control system to independently adjust the tension of unwinding, traction and winding sections respectively. Run the material at a constant low tension to prevent tensile deformation.

2.Install an EPC/LPC photoelectric deviation correction system to correct fabric position in real time and avoid diagonal cutting and unilateral offset.

3.Coat the upper and lower pressing rollers with rubber to ensure uniform pressure across the entire web, compress the fabric to prevent bulging and edge curling; install spreading rollers before slitting to smooth out wrinkles.

4.Let incoming rolled materials stand for moisture conditioning in advance to eliminate internal winding stress before slitting processing.

Uneven cutting in multi-layer stacking and interlayer slippage

Cause

1.When cutting stacked multi-layer nonwovens, the friction between layers is relatively low. Relative slippage tends to occur under cutting force, resulting in inconsistent cutting lengths of each layer.

Solutions

2.Install material pressing pins, anti-slip press strips or electrostatic adsorption devices at the front end of the cutting station to fix multi-layer fabrics.

3.Reduce cutting speed and adopt the instantaneous punching cutting mode to sever materials instantly and shorten slipping duration.

4.Fit limit baffles on both sides of stacked materials for transverse limiting to prevent fabric offset.

Summary

Five typical problems exist in nonwoven cutting: edge melting & adhesion, burrs and loose filaments, dimensional deviation caused by stretching, incomplete cutting with residual joint for thin materials, and rapid tool wear when cutting thick materials.

Comprehensive optimization can be carried out in five aspects: control tool material and cutting edge sharpness, configure matched tension and deviation correction systems, precisely adjust shear clearance, select cold cutting or thermal cutting as required, and apply pressing & shaping for incoming materials. This solution is applicable to slitting production of spunbond, hydroentangled, needle-punched, melt-blown and other types of nonwovens.