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Slitter Razor Blades: Overview [Video]

Industrial blades and knives for the plastics industry

Slotted Slitter Blades for Industrial Slitting of Flexible Materials

Sollex Best Selling Industrial Blades 5X and 5K for plastic film, foil cutting, converting on Slitter-Rewinder cutters

Slotted slitter blades, along with 3-hole blades, injector blades, and Gillette-type blades, are blades used in industrial razor slitting processes. They are employed in slitter rewinder machines to convert and cut flexible materials into narrow strips that are then rewound into neat rolls. These blades are essential in producing precise, high-quality cuts and are widely used across various industries.

cutting with slitter blade - industrial razor blade in slitter rewinder machine - Sollex




Key Features and Specifications of Slotted Slitter Blades

Industrial slotted slitter blades have a rectangular shape, typically measuring 57x19 mm. Unlike 3-hole slitter blades, the slotted variant has a robust design with a single oblong slot in the center. This design allows for the cutting of not only basic plastic films such as polyethylene (PE) and polypropylene (PP) but also thicker, more abrasive materials with additives or impurities, including recycled films and those with calcium carbonate fillers.

Sollex slitter blades with rounded and straight cutting edges

Slotted slitter blades are available in thicknesses of 0.20 mm, 0.38 mm, and 0.40 mm, and can feature straight or rounded corners to match the material and application. The blade’s thickness and design play a significant role in cutting performance, especially when dealing with challenging materials in foil slitting and plastic slitting processes.

Dimensions and drawing of slitter blades with center hole industrial razor blades with rounded cutting edges - Sollex Dimensions and drawing of slitter blades with center hole industrial razor blades with straight cutting edges - Sollex




Industrial Razor Blade Materials Overview

Slotted slitter blades are manufactured using a range of high-quality materials, each chosen to ensure durability, precision, and optimal cutting performance:

Common material types slitter razor blades are made of

Blade Material

Key Properties

Advantages

Carbon steel

High hardness and affordability

Ideal to convert simple plastic films with minimal additives

Stainless steel

Corrosion resistance and long-lasting sharpness

Suitable for clean environments and basic plastic films

Ceramic

Exceptional wear resistance and low friction

Well-suited for films with additives and demanding cutting conditions

Solid tungsten carbide

Extreme hardness and resistance to wear and deformation

Effective for hard laminated films and composite materials slitting

Zero friction (coated)

Reduced friction, minimal heat generation

Perfect for thin, stretch films processing

Titanium

High corrosion resistance

Ideal for specialized applications requiring robust blades

Comparison of industrial blades of carbon vs stainless steel vs tungsten carbide + extra coatings to improve their performance - Sollex industrial machine knives and blades



Razor Blade Application Areas & Typical Slitter & Converting Machines

Slotted slitter blades are used in a wide array of slitting and converting machines, ensuring precise cuts and minimal waste. Common applications and machines include:

Types of slitting rewinding machinery

Application Area

Typical Machines and Equipment

Flexible packaging

Slitter rewinder machines, including those by Kampf, Atlas, and Goebel

Label production

Label slitting and finishing equipment

Paper and film converting

Narrow web slitter rewinders, turret rewinders

Laminated films and barrier packaging

Duplex and duplex-turret slitter rewinders

Recycled plastic films

High-speed slitter rewinders with tension control

The slotted slitter razor blades excel in cutting a broad range of materials, thanks to their robust construction and precise edge geometries.

Types of flexible materials razor blades cut and convert

Material Cut

Examples and Applications

Simple plastic films

PE (polyethylene), PP (polypropylene)

Films with additives

White plastic films, composite films

Recycled films

Plastic films containing calcium carbonate or other fillers

Laminated and multi-layered films

Flexible packaging films, barrier films

Soft flexible foils

EBA (ethylene butyl acrylate) and similar foils

Thin stretched films

Stretch and shrink films for packaging

Rubber and foils

Lightweight technical materials in packaging and insulation industries





Sollex Slotted Razor Slitting Blades Overview


Our Sollex industrial-type slitting blades are tailored to meet the exacting needs of modern converting processes:

Sollex Slitting Razor Blades Overview

SKU

Blade Material

Application

Thickness (mm)

Pack (pcs)

5-020

Carbon steel

Simple plastic films

0.20

200

5Q

Ceramic

White films with additives

0.40

100

5L

Stainless steel

Simple plastic films

0.40

100

5V

Tungsten carbide

Laminated films and plastic packaging

0.38

10

5C

Ceramic

Soft flexible film foils (EBA)

0.40

10

5-020-Z

Zero friction coated

Thin stretched films

0.20

200

5K

Ceramic

White films with additives

0.38

100

5Z, 5LZ

Zero friction coated

Thin stretched films

0.38

100

5T

Titanium

Plastic films with additives

0.38

100

5X

Solid ceramic

Multilayer plastic films

0.38

30

5K slitter slotted blade with ceramic coating for industrial use - sollex blogSollex Slotted Razor Slitting Blades include various models for different applications. The 5-020 carbon steel blade is intended for simple plastic films with few additives and is 0.20 millimeters thick, packed in sets of 200. The 5Q ceramic blade is suitable for white plastic films with additives, measuring 0.40 millimeters in thickness and available in packs of 100. The 5L stainless steel blade is also 0.40 millimeters thick and designed for simple plastic films with minimal additives. The 5V solid tungsten carbide blade is ideal for hard laminated films and plastic packaging, with a thickness of 0.38 millimeters and packed in sets of 10. The 5C solid ceramic blade, measuring 0.40 millimeters thick, is best suited for soft flexible film folies. The 5-020-Z zero friction blade is perfect for thin stretched film at 0.20 millimeters thick and comes in sets of 200. The 5K ceramic blade, with a thickness of 0.38 millimeters, is used for white plastic films with additives. The 5Z and 5LZ zero friction blades are also 0.38 millimeters thick and designed for thin stretch films. The 5T titanium blade is 0.38 millimeters thick, developed for plastic films with additives. The 5X solid ceramic blade, measuring 0.38 millimeters, is ideal for multilayer plastic films with additives. Each blade is precision-crafted to deliver consistent, high-quality results in slitting and rewinding applications.




Expert Tips from Sollex: How to Achieve Optimal Cutting Results

The choice of knife configuration, such as shear, razor, crush cut, or score cut, depends on the material being processed and the desired slit quality. Factors such as blade sharpness, angle, and positioning influence the cutting performance and the quality of the finished rolls. Precise adjustment of blade gap, overlap, ensure optimal cutting performance and minimizes material waste. While specific values for factors such as knife positioning, tension control, and slitting speed can vary Sollex 5X fully coated slitting razor blades for cutting and converting of e.g. aluminium foil, adhesives, agricultural, packaging film, shrink film, laminate, PCR, recycled filmdepending on the material being processed, the equipment used, and other factors, we can provide some general guidelines and recommended values.

  1. The cutting angle is crucial: 45 degrees for razor slitting and 90 degrees for shear cutting.
  2. Blades must always be sharp to maintain top cutting performance; keep a stock of replacement blades for continuous production.
  3. Match the blade thickness to the material’s thickness, accounting for additives and slitting speed.
  4. High cutting speeds can generate excessive heat at the blade edge, causing film melting and poor-quality cuts.
  5. Blade coatings reduce edge heating caused by friction, preserving cut quality.
  6. Material elasticity influences tension control; more elastic materials demand precise tension adjustments to prevent stretching or wrinkling.
  7. Tension variation should be kept within five percent of the target to ensure consistent slit and rewound rolls.
  8. In shear slitting, four factors are critical: blade overlap (0.50–0.75 mm), cut point, side loading pressure, and cant angle (0.25 degrees for films). Adjust slitter and web speeds, and blade profiles for the best result.
  9. Always conduct tests and consult equipment manufacturers and industry experts to optimize settings for each specific application.

While these tips and guidelines offer a solid foundation, adapting them to your unique production environment is key. Continuous testing and collaboration with experts can uncover additional ways to enhance cutting quality and production efficiency. With the right approach and attention to detail, achieving top-tier slitting and rewinding results is well within reach.




Order Film & Foil Slitting Razor Blades for Industrial Cutting

At Sollex, we offer not only the best razor blades for slitting but also the technical knowledge and support to help you choose the most suitable blade material and configuration for your specific needs. Explore our range of slitter blades, including slotted slitter blades, foil slitting blades, plastic slitting blades, and industrial slitting blades, and elevate your slitting operations to the highest standards.

Sollex has a Large Variety of Different Industrial Blades for Blown Film Extrusion, Flexographic Printing, and Converting - Sollex blog



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