Small Laboratory Knife Crusher for Plastic Sample Preparation and Material Grinding

Product Overview

This small laboratory knife crusher is a high-performance preparation tool engineered for rapid size reduction of solids. It employs a set of three rotary and four stationary alloy steel blades driven by a 2.2 kW motor at 617 rpm, generating cutting, impact, and extrusion forces that efficiently break down materials into uniform granules. Designed for lab-scale operations, this system bridges the gap between manual processing and industrial equipment, delivering consistent particle sizes from 2 to 10 mm with minimal operator intervention.

Its primary applications span sample preparation for material science, quality control in plastics manufacturing, and R&D in polymers and composites. The unit excels with thermoplastics, thermosets, rubbers, and other synthetic materials, but also handles food, pharmaceutical, and chemical samples. Thanks to its adjustable screen system, users can precisely tune output granularity to match downstream analytical requirements, making it indispensable for labs needing reproducible sample homogenization.

Engineered for durability, this crusher features a robust welded frame and dynamically balanced drive components, ensuring vibration‑free operation even under continuous duty. The alloy steel blades resist wear and maintain edge sharpness over thousands of cycles, while the quick‑release chamber design simplifies cleaning and screen changes. With casters for mobility and a footprint under half a square meter, it integrates seamlessly into crowded lab benches and mobile carts.

Key Features

• Powerful Cutting Action: The 3‑rotor/4‑stator blade configuration generates high shear forces that slice through tough plastics, fibrous materials, and brittle solids. This design prevents jamming and ensures smooth material flow, even with tacky or heat‑sensitive inputs.
• Alloy Steel Blade Durability: Blades are precision‑ground from hardened alloy steel, resisting chipping and corrosion. This material choice extends service life by up to 5× compared to stainless steel alternatives when processing abrasive or high‑hardness feedstocks, reducing maintenance downtime.
• Interchangeable Screen System: Standard screen openings range from 6 mm to 10 mm, with optional 2‑5 mm screens available for fine grinding. Changing screens takes under 2 minutes, allowing rapid switchover between size specifications without tools.
• Compact, Lab‑Ready Footprint: Measuring only 380×500×860 mm, the unit fits on standard lab benches while maintaining a low center of gravity for stability. Integrated locking casters enable one‑person relocation and secure placement.
• Low Noise and Zero Vibration: Advanced rotor balancing and rubber‑mounted motor mounts keep operational noise below 70 dB(A). This makes the crusher ideal for noise‑sensitive environments like analytical labs and shared workspaces.
• Versatile Material Handling: From rigid PVC and polyethylene to fragile pharmaceutical granules and spices, the crusher adapts through blade geometry and screen selection. It effectively processes materials with hardness up to Shore D 80 and fiber content up to 30%.
• Rapid Cleaning and Decontamination: The hinged crushing chamber and detachable collecting bin allow full access for brush‑cleaning or solvent wiping. This design prevents cross‑contamination and meets GLP guidelines for multi‑sample workflows.
• Custom Material Upgrades: Beyond standard carbon steel screens, stainless steel, PTFE‑coated, or ceramic‑coated components are available on request to handle corrosive chemicals or sanitary applications. Blades can also be supplied in alternative alloys for specialized wear resistance.

Applications

Technical Specifications

Why Choose This Product

• Engineered for Continuous Dependability: From the dynamically balanced spindle to the hardened blade sets, every detail is optimized for long-term performance under rigorous lab conditions. This reduces unplanned maintenance and provides a low total cost of ownership over years of service.
• Precision Manufacturing, Consistent Output: Tight tolerances on blade clearance and screen mounting ensure repeatable particle size distributions batch after batch. This consistency is crucial for labs that depend on reproducible sample preparation for validated analytical methods.
• Built to Handle the Toughest Materials: The alloy steel blades and robust 2.2 kW motor deliver high torque at low speeds, enabling the crusher to tackle materials that would challenge lesser units. Its ability to process filled polymers, mineral‑loaded compounds, and tough engineering plastics makes it a versatile workhorse.
• Quiet, Safe, and Easy to Integrate: With noise levels comparable to a conversation and a vibration‑free operation, this crusher can be placed in open lab settings without disruption. Safety features include a lid‑interlock switch and thermal overload protection for the motor.
• Customization to Fit Your Process: We understand that no two labs are alike. Our engineering team can customize screen materials, blade coatings, and even chamber dimensions to align with your specific application. Reach out to discuss how the PP-SL28 can be configured for your exact workflow requirements and request a quote today.