Mirror-Polished Circular Slitter Knives for Adhesive Tapes & Pressure-Sensitive Labels

Non-Stick Converting Technology: Preventing Adhesive Buildup

The Challenge: High-speed slitting of pressure-sensitive labels, BOPP packaging tapes, and industrial laminates causes adhesive bleeding. Under continuous runs, chemical adhesives and polymers transfer and bond onto conventional blade flanks. This buildup creates high frictional drag, leading to strip wrinkling, adhesive stringing, and frequent line stoppages for manual blade cleaning.

Our Solution: ALAS eliminates adhesive residue and web tearing by combining precision-ground steel substrates with low-surface-energy PVD and chemical-resistant coatings.

Materials & Performance Tiers

To match specific line speeds and tape substrates, we offer four specialized material tiers:

• Solid Tungsten Carbide (89–92.5 HRA): Recommended for high-speed, automated continuous tape converting requiring maximum abrasive wear resistance.

• Powder Metallurgy HSS (PM-HSS): Engineered for high-strain shearing lines handling tough industrial tapes like PET and Polyimide (PI), delivering superior edge toughness.

• Refined AISI M2 HSS / JIS SKH51 (62–65 HRC): Optimized for high-speed label converting rewinders running at 300 to 800 m/min to resist thermal edge softening.

• AISI D2 / JIS SKD11 (58–62 HRC): A cost-effective alloy steel option balancing standard wear resistance for medium-speed BOPP carton-sealing tape conversion.

Anti-Sticking Surface Treatments & Coatings

• Precision Lapping (Ra 0.1 – 0.2 μm): Flanks are diamond-lapped to minimize surface micro-roughness, removing the anchoring points that catch volatile glues.

• Anti-Sticking Teflon® (PTFE) Coating: Applied to create an ultra-low surface energy barrier, preventing gummy hot-melt or acrylic adhesives from sticking to the knife face.

• Wear-Resistant DLC / CrN Coatings: Optional PVD Diamond-Like Carbon (DLC) or Chromium Nitride (CrN) layers increase surface hardness up to 2200–3000 HV, reducing friction coefficients on high-speed abrasive film runs.

Standard Size Window & Manufacturing Capabilities

To ensure perfect fitment with high-speed pneumatic knife holders and score/shear cut shafts, our automated production window handles the following specifications:

• Outer Diameter (OD): 40 mm – 350 mm

• Inner Diameter (ID): 19 mm – 220 mm (Supports single/double drive slots, DIN/JIS keyways, and location pinholes)

• Thickness Window: 0.20 mm – 5.0 mm (Thickness tolerance held strictly within ±0.002 mm)

Custom single-bevel profiles, razor strip blades, and multi-edge score cutters are manufactured strictly to client technical blueprints.

Anti-Scratch Preservation & Export Packaging

Coated non-stick surfaces and fine-lapped edges require absolute scratch protection and humidity stabilization during international maritime transit:

• Surface Shielding: Coated blades (Teflon®/PTFE/DLC) are vacuum-wrapped individually in VCI (Volatile Corrosion Inhibitor) film to eliminate tool-to-tool friction and rust.

• Edge Protection: Secured inside dedicated high-density shock-absorbing plastic cassettes or nested foam trays to lock the blade geometry.

• Outer Packing: Shipped inside heavy-duty, ISPM-15 compliant export wooden crates equipped with internal bracing and moisture-absorbent desiccant packs.

Technical FAQ | Non-Stick Tape & Label Slitting Knives

Q1: What mechanical factors cause adhesive gumming (buildup) on the knife flanks, and how do we prevent it?

A: During high-speed slitting, extreme friction heat and continuous compression force pressure-sensitive glues to bleed. Volatile chemical adhesives transfer and micro-weld onto standard steel grinding marks, which act as mechanical anchoring points. This buildup creates severe frictional drag, leading to strip wrinkling and ragged edges. We eliminate this by diamond-lapping our substrates to Ra 0.1–0.2 μm to remove these anchoring points, combined with low-surface-energy Teflon (PTFE) or PVD DLC coatings that prevent gummy polymers from bonding to the knife face.

Q2: How do we choose between Solid Tungsten Carbide, PM-HSS, and M2 HSS for high-speed label and tape converting?

A: Material selection must align with your line velocity, target substrate abrasiveness, and machine status:

• Automated Continuous Tape Converting (>60 m/min): Specify Solid Tungsten Carbide (89–92.5 HRA). Its extreme hardness resists the continuous abrasive wear of heavy film backings and structural adhesives.

• High-Tenacity Industrial Tapes (PET / Polyimide): Specify Powder Metallurgy HSS (PM-HSS). It delivers superior edge toughness and wear resistance under high shear strain without chipping.

• High-Speed Label Rewinders (300–800 m/min): Specify Refined AISI M2 HSS (62–65 HRC). It provides the necessary thermal red hardness to resist edge softening caused by rapid friction heat.

• Medium-Speed BOPP Lines & Legacy Setup: Deploy AISI D2 / SKD11 (58–62 HRC). It serves as a reliable, cost-effective baseline grade for generic carton-sealing tape conversion.

Q3: What is the correct sharpening and maintenance routine for coated non-stick slitting knives?

A: Implement preventative maintenance grinding at the first sign of micro-wear or adhesive bleeding. Operating dulled tools destroys the anti-stick coating and overloads slitter arbors.

• Light Regrind: Use a fine-grit diamond wheel (for Tungsten Carbide) or CBN wheel (for HSS/D2 steels) under high-volume flood cooling. Remove only 0.01 mm to 0.02 mm of material per pass to clear the fatigue layer.

• Flank Relapping: Follow the grind with diamond side-flank lapping to fully restore the Ra 0.1–0.2 μm finish.

• Coating Re-Application: Note that standard regrinding removes the coating along the cutting edge bevel. For extreme acrylic or hot-melt applications, knives must be stripped and re-coated with Teflon® or DLC to maintain complete non-stick properties.

Target Materials & Machinery Compatibility

ALAS low-surface-energy non-stick slitting knives are globally field-tested across continuous tape converting lines and high-efficiency labeling equipment:

Compatible OEM Lines: Fully compatible with universal slitting systems and automated rewinder brands, including Kampf, Dusenbery, Nishimura, Goebel, Titan, and Ashe converting lines.

Applicable Substrates: Engineered for high-speed, jam-free partitioning of BOPP packaging tapes, acrylic double-sided adhesive webs, hot-melt pressure-sensitive labels, PET protective films, and Polyimide (PI) industrial electronic strips.