Chemical Fiber Industry Blade

Slitting knives in the chemical fiber industry are key tools used to precisely cut chemical fiber filaments, films, non-woven fabrics and other materials into finished products according to specific dimensions to meet the needs of subsequent production.

Products Provided by Kedel

We offer the following types of blades. Whether you need standard sizes or customized sizes, we can precisely meet your unique requirements.

Straight Blade

Slotted Blade

Three-Hole Blade

Need custom blades? We design and make them

Application Scenarios

Our blades are key to chemical fiber production, suitable for slitting PET separators, aramid fibers and other materials, ensuring efficient production and quality.

Ordinary PET Separator

Aramid Fiber

Melt-blown Nonwoven Fabric

Spandex Filament

Lithium-ion Battery Separator

Uncover Your Needs with Us!

If you need custom chemical fiber industry blades, contact us with your slitting equipment details, tool holder specs, blade performance needs and working conditions. Our engineers will create a tailored solution and reach out within 72 hours to boost your chemical fiber processing efficiency and quality.

What is a Chemical Fiber Industry Blade?

Slitting knives in the chemical fiber industry are specialized tools that cut large-format rolled or tow materials like polyester, nylon, and acrylic filaments, films, and non-woven fabrics into required specifications through slitting and filament splitting, featuring structural types of high-speed rotating circular blades for continuous slitting of filaments/films and shearing flat blades for non-woven fabrics/thick sheets, made from materials like high-speed steel, cemented carbide, and ceramics to suit different fibers (e.g., high-precision slitting of polyester films or high-strength cutting of aramid fibers), classified functionally into filament splitting blades, slitting blades, and indentation blades, with parameters like edge angle and thickness adjusted to fiber properties (e.g., spandex or carbon fiber) to ensure slitting precision, edge quality, and production efficiency as key production line components, reducing fuzz and curling for improved product quality.

What are the common tool types used in Chemical Fiber Industry Blade slitting?

Different chemical fiber slitting knives solve cutting problems specifically, ensuring efficient slitting and high – quality products.

Straight Blade

Structural Features: The cutting edge is straight, and the blade body is mostly rectangular or a customized shape suitable for the equipment, with excellent rigidity. There are mounting holes, which can be firmly clamped on the slitting machine tool holder. The thickness of the cutting edge is uniform, and it can accurately shear chemical fiber materials through linear motion.
Functional Advantages: When cutting chemical fibers, it can ensure that the edges are neat and have few furs. The stable shearing force can reduce the risk of tearing of chemical fiber tows and films, and it is suitable for medium – and low – speed chemical fiber slitting production lines, ensuring slitting accuracy and efficiency.
Typical Applications: It is used for splitting chemical fiber filaments (such as cutting large tows into small – specification tows), slitting ordinary chemical fiber films (such as cutting polyester films for conventional packaging), and helping to form accurate dimensions of chemical fiber products.

Slotted Blade

Structural Features: The blade body has a slotted structure (the slot type and size are determined according to the chemical fiber process). The cutting edge maintains the cutting function. The slots can optimize chip removal and heat dissipation, adapting to the handling of chips and prevention and control of thermal effects during chemical fiber processing.
Functional Advantages: When slitting chemical fibers (especially easy – to – adhere, hot – melt chemical fibers, such as some modified polyesters), the slots help to quickly discharge cutting chips, avoid knife wrapping, and at the same time relieve the accumulation of cutting heat, maintain the stable performance of the cutting edge, and ensure slitting quality.
Typical Applications: It is used for slitting hot – melt chemical fiber films (such as some functional films that need to be slit before heat setting), splitting high – viscosity chemical fiber filaments, and solving the problems of chip removal and knife sticking during slitting with conventional tools.

Three-Hole Blade

Structural Features: Three mounting holes are distributed on the blade body, and it is accurately fixed on the tool holder through the hole positions, enhancing the clamping stability. The shape of the cutting edge is suitable for the needs of chemical fiber slitting, and the multiple fixed points are used to disperse the cutting stress.
Functional Advantages: When slitting high – strength and high – modulus chemical fibers (such as aramid fibers, carbon fibers, etc.), the stable clamping and stress dispersion can reduce the tremor of the cutting edge, ensure slitting accuracy, reduce blade wear, and be suitable for high – speed and high – precision chemical fiber slitting scenarios.
Typical Applications: It is used for the precise splitting of high – performance chemical fiber filaments (such as the slitting of carbon fiber tows for aerospace use), the cutting of high – strength chemical fiber films (such as the slitting of aramid films for bullet – proof vests), and meets the strict slitting requirements of high – end chemical fiber products.

What materials can be used to make cutting blades ?

In the chemical fiber industry, the selection of blade materials needs to balance wear resistance, corrosion resistance, hardness and toughness to adapt to the cutting requirements of chemical fiber materials (such as filaments, films, short fibers, etc.).

Grade	Hardness & Wear Resistance	Impact Resistance & Toughness	Typical Applications
YG10X	Ultra-high hardness; excellent wear resistance; low regrind frequency	Moderate (lower than YG6X), sufficient for most fiber processing	Rigid fibers (aramid, carbon fiber); high-speed film slitting; hard short fiber cutting
YG12X	High hardness; long-lasting sharpness; suitable for medium-high speed slitting	Excellent balance; strong anti-fracture under heavy impact	Vibration-prone slitting machines; composite film; elastic fiber cutting
YG13X	Good wear resistance; adapts to harsh conditions (slightly lower edge retention than YG10X/YG12X)	High (13% Co content); significantly enhanced impact resistance	High-load/strong-vibration scenarios; thick sheets; coarse denier fibers; impurity-containing materials

What parameters do we need to understand ?

Understanding parameters is the basis for accurately matching blade materials, structures, and chemical fiber slitting conditions to ensure cutting quality, efficiency, and cost control.

Key Parameters for Purchasing Chemical Fiber Slitting Blades

Material: Such as cemented carbide (YG10X/YG13X), high-speed steel (SK2), etc., which determine hardness and wear resistance.
Hardness: Expressed as HRC/HRA (e.g., HRC 63-66), matching the hardness of chemical fiber materials (e.g., choose YG10X for high hardness, YG13X for high impact).
Compatible materials: Specify the chemical fiber types to be slit (e.g., PET separators, aramid fibers, melt-blown nonwovens).
Dimensions: Blade length and thickness must match the slitting machine’s tool holder (e.g., 95×15.8×2mm, 125×10×0.5mm).
Edge performance: Sharpness (no chipping, no black edges) and durability (e.g., sharpness remains after 300 uses).

These parameters directly affect blade-equipment compatibility, slitting efficiency, and service life.

How to maintain and service cutting blades?

Reasonable maintenance of blades can reduce wear, extend service life, maintain stable cutting performance, and is the core guarantee to reduce production costs and ensure production efficiency and product quality.

I. Pre-Use Preparation

Visual Inspection

Inspect blades for chipping or cracks, particularly focusing on the slots of slotted blades and the areas surrounding the holes of three-hole blades. Immediately replace any blades with minor damage to prevent further deterioration during operation.
Verify the straightness of straight blades using a precision square. Replace blades with bending or deformation exceeding 0.02mm to ensure cutting accuracy.

Cleaning Procedures

Wipe the blade surface with a soft, lint-free cloth dampened with a neutral cleaning solution (e.g., isopropyl alcohol) to remove oils, dust, or residues accumulated during storage or transportation.
Use compressed air (0.3–0.5 MPa) to purge debris from the slots of slotted blades, ensuring unobstructed chip evacuation and optimal heat dissipation.

II. Operational Maintenance

Cutting Parameter Optimization

Adjust machine parameters (linear speed, feed rate) based on material properties:
- Thin/soft materials (e.g., PET film): ≤300 m/min linear speed, 0.1–0.3 mm/r feed rate to minimize edge wear.
- Thick/hard materials (e.g., aramid fiber): 200–250 m/min linear speed, 0.05–0.2 mm/r feed rate to reduce cutting forces.
Maintain three-hole blade shaft concentricity within 0.01 mm to prevent uneven wear and ensure dimensional accuracy.

Cooling & Lubrication

Activate cutting fluid systems (emulsion or synthetic coolant) with a flow rate ≥5 L/min and pressure 0.2–0.4 MPa to manage heat generation (cemented carbide max temp: 600°C).
Direct targeted coolant flow to slotted blade grooves to prevent material adhesion and enhance chip removal.

Anomaly Detection

Monitor operational noise: Abnormal sounds indicate potential blade damage or material jams—immediately halt operations for inspection.
Inspect cut edges for defects (e.g., excessive fuzz, dimensional 偏差超过 ±0.05 mm) and adjust blade alignment or parameters as needed.

III. Post-Use Care

Deep Cleaning

Straight/three-hole blades: Ultrasonic cleaning (40 kHz, 5–10 min) using specialized detergents, followed by rinsing with deionized water and drying with warm air (≤60°C).
Slotted blades: Use soft brushes or fine needles (0.5 mm diameter) to remove residual debris from slots after ultrasonic treatment.

Storage Protocols

Apply a thin layer of rust inhibitor (e.g., hard-film coating) to prevent oxidation, especially in humid environments.
Store blades in dedicated, padded containers to protect edges and holes. Maintain storage conditions at ≤40% relative humidity and 15–25°C.

IV. Periodic Maintenance

Edge Resharpening

Inspect blade edges under 200× magnification every 50,000–100,000 meters of cutting. Resharpen using diamond grinding wheels (120–200 grit) to restore edge radius ≤5 μm.
Ensure three-hole blade hole-to-edge alignment remains within 0.01 mm tolerance during resharpening to prevent uneven stress distribution.

Coating Restoration

For coated blades (e.g., TiAlN, DLC), address coating delamination by re-depositing via vacuum coating processes to restore lubricity and wear resistance.

Key Maintenance Principles

Preventive Handling: Avoid impacts to vulnerable areas (edges, slots, holes) during all handling procedures.
Environmental Control: Mitigate humidity and chemical exposure during storage; ensure adequate cooling during operation to prevent thermal degradation.
Proactive Monitoring: Regularly assess blade wear and operational parameters to extend service life by 2–3 times through timely interventions.

Adhering to this maintenance regimen ensures consistent performance of cemented carbide blades in high-precision chemical fiber processing applications.

How long can a blade typically be used ?

Replacing blades can maintain stable cutting precision, ensure product quality, avoid production failures and efficiency losses caused by blade wear, and is a key link to ensure the efficient and high – quality operation of chemical fiber slitting operations.

Blade Type	Chemical Fiber Material	Slitting Thickness/Specification	Slitting Speed	Maintenance Level	Typical Replacement Cycle	Key Judgment Basis
Straight Blade	Ordinary PET Film (Soft)	Thickness 10 – 50μm, Narrow – width Slitting	300 – 500m/min	Excellent (Cleaning + Rust Prevention + Regular Re – sharpening)	15 – 30 days	Edge Burr ≥ 0.1mm, Dimension Deviation ± 0.05mm
	Aramid Fiber (Hard)	Tow Diameter 0.1 – 0.3mm	100 – 200m/min	Good (Basic Cleaning + Occasional Re – sharpening)	3 – 7 days	Blade Edge Chipping ≥ 0.2mm, Sudden Increase in Cutting Force
Slotted Blade	Melt – blown Non – woven Fabric (Hot – melt)	Thickness 20 – 80μm, Wide – width Slitting	200 – 400m/min	Excellent (Focus on Slot Cleaning + Cooling Adaptation)	10 – 20 days	Slot Blockage Frequency > 3 times/Shift, Severe Edge Adhesion
	Spandex Filament (High Elasticity)	Monofilament Fineness 50 – 200D	150 – 300m/min	Good (Routine Cleaning + Simple Slot Dredging)	5 – 12 days	Post – slitting Tow Deformation Rate > 5%, Slot Wear and Widening
Three – hole Blade	Lithium – ion Battery Separator (Precision)	Thickness 5 – 20μm, Multi – blade Parallel Slitting	400 – 600m/min	Excellent (Strict Concentricity + Coating Maintenance)	20 – 45 days	Hole Position Deviation > 0.02mm, Cutting Precision Deviation ± 0.02mm
	Carbon Fiber Prepreg (High Strength)	Thickness 0.1 – 0.5mm	80 – 150m/min	Good (Basic Inspection + Anti – collision)	4 – 10 days	Blade Micro – crack Propagation > 1mm, Frequent Cutting Abnormal Noise

Explanation and Supplement:

Cycle Fluctuation Logic:
- In the same scenario, if the slitting speed increases by 30%, the replacement cycle may be shortened by 20% – 40% (high speed aggravates wear);
- “Excellent” maintenance can extend the service life by 30% – 50% compared to “Good” maintenance (for example, regular re – sharpening can make the straight blade last 5 – 10 more days).
Extreme Scenario Reference:
- When slitting chemical fibers containing sand – like impurities (such as recycling material slitting), the replacement cycle of all blades is shortened by more than 50%, and filtration and cleaning need to be strengthened;
- During ultra – precision slitting (precision ± 0.01mm), even if there is no obvious wear of the blade, it is recommended to replace/re – sharpen the blade after slitting 100,000 – 150,000 meters.
Simple Self – inspection Method:
Before each shift of production, gently wipe the blade edge with a white non – woven fabric to observe if there is black debris accumulation (to judge if lubrication/heat dissipation fails);
After collecting the slitting waste, compare the edge burr width (if it exceeds twice the standard value, maintenance/replacement is required).

In actual production, it is recommended to first trial – run according to the “typical cycle”, and then accurately adjust the replacement rhythm of the production line in combination with the cutting quality qualification rate (for example, from 99% to 95%) and the equipment energy consumption change (blade wear will lead to an increase in motor load), to balance cost and efficiency.