double shaft shredder for plastic

Plastic, with its durability, lightweight nature, and versatility, has become essential in modern industry. However, these same advantages make plastic waste difficult to dispose of efficiently. Traditional shredding methods often struggle to process plastic products of varying shapes, sizes, and hardness. Double-shaft shredders for plastic are specifically designed to address these challenges.

How Double Shaft Shredders Work

The double-shaft design features two rotating shafts equipped with staggered blades. Operating at low speed with high torque, these shafts generate powerful shearing and tearing forces, making them ideal for processing tough and bulky plastic materials, such as:

• Large injection molding scraps

• Automobile bumpers

• Plastic drums and pipes

• Bales of plastic film

Unlike single-shaft or hammer crushers that rely mainly on impact, double-shaft shredders combine tearing and shearing, producing a smoother and more efficient size reduction. This method generates less heat, minimizing the risk of overheating, melting, or adhesion to the blades.

The Shredding Process

Plastic material enters the shredder via the feed system. The two shafts rotate in opposite directions, capturing and pulling the material between staggered blades. These blades work together to repeatedly tear and cut the plastic into smaller fragments.

A screen at the discharge port controls the size of the final output. Only fragments smaller than the screen aperture are discharged, ensuring uniform shred size suitable for downstream processing.

Role in Plastic Recycling

The uniform plastic shreds produced by twin-shaft shredders are ideal for transportation, storage, and further processing. They are typically fed into a pelletizing system, where they undergo:

1. Melting

2. Filtering

3. Extrusion

4. Pelletizing

The resulting recycled plastic pellets can then be reused in:

• Injection molding

• Blow molding

• Extrusion of packaging products

This process closes the plastics recycling loop, turning post-consumer or industrial waste into high-quality raw material for new products such as packaging boxes, pallets, and benches. By providing uniform, high-quality shreds, double-shaft shredders maximize recycling efficiency and material value.