Zerma Granulator Blades - High Quality Replacement Knives

To look at our range of Granulator blades for other machines please use the top menu or go to our main page about Fernite’s plastic granulator blades.

Types of Granulator Blades We Manufacture

Rotor Blades

Rotor blades are mounted on the rotating shaft inside the cutting chamber. As the rotor spins at high speed, these blades pass closely against the stationary bed knives to shear plastic materials.

Rotor knives experience the highest mechanical load in the system and therefore require excellent wear resistance and edge stability.

Bed Knives (Stationary Blades)

Bed knives are mounted on the fixed cutting chamber housing. Their purpose is to provide the stationary cutting surface against which the rotor blades shear material.

Correct alignment between the rotor and bed knives is essential for efficient cutting.

Custom Granulator Knives

In addition to standard blade designs, we also manufacture custom granulator blades based on:

• Technical drawings
• Existing blade samples
• Machine model specifications

Our replacement blades are suitable for many Zerma granulator models used in plastics recycling and processing operations.

Correct Blade Gap (Critical for Performance)

Typical gap range is 0.1 mm – 0.3 mm. The clearance between rotor blades and bed knives is extremely important for efficient cutting.

If the gap is too large

If the gap is too small

If the gap is too large

If the gap is too small

This is what our customers say

Efficient service

July 4, 2024

We trust Fernite and have known the business for years. The quality of service – that is the team, the efficiency, the speed of turn around and the legacy of the business

Iwan

Granulator Blade Manufacturing Process

1. Raw Material Selection

Premium tool steel is selected based on the customer’s application and material being processed.

2. Precision Machining

Blades are cut and machined to accurate dimensions using CNC milling equipment.

3. Heat Treatment

Blades undergo controlled heat treatment to achieve optimal hardness and structural strength.

Typical hardness levels range between:

HRC 56 – 60 depending on blade material.

4. Precision Grinding
The cutting edges and mounting surfaces are ground using CNC grinding machines to achieve tight tolerances and smooth surface finishes.

5. Final Inspection

Each blade undergoes dimensional inspection and quality control checks before shipment.

Frequently Asked Questions from our Customers

Are your replacement blades as good as OEM blades?

Our Zerma granulator blades are fully compatible with existing granulator rotor and stator configurations. They are manufactured from high-grade, wear-resistant steels to handle abrasive plastics, providing high-quality cutting performance and durability.

How often should granulator blades be replaced?

The replacement interval for granulator blades depends on the material being processed, machine settings, and blade quality. Yes! We offer professional granulator knife sharpening service. However, blades can typically only be sharpened 2-3 times before dimensional changes affect performance.