In-Plant HDPE Preform Recycling Application: ASP-ECO Integrated Shredding and Pelletizing System

HDPE preform production inevitably generates a certain amount of production scrap.
Typical waste materials include:
• Defective HDPE preforms 
• Startup waste 
• Machine setup waste 
• Production changeover waste 
• Other in-plant HDPE production scrap 
Although these materials are relatively clean compared with post-consumer plastic waste, they can still create practical problems when they are collected and processed offline.

The waste needs to be:
1. Collected 
2. Stored 
3. Transported 
4. Reprocessed 
5. Returned to production 
For a continuous manufacturing operation, these additional handling steps can increase labor requirements and occupy valuable production-floor space.
The objective of this application is therefore to recycle the production scrap directly inside the manufacturing plant.

The main difference between this application and conventional plastic recycling is where the recycling takes place.
Conventional Offline Recycling
Production Scrap → Collection → Temporary Storage → Transportation → External / Separate Recycling Line → Recycled Pellets
In-Plant Recycling
HDPE Preform Scrap → ASP-ECO → Recycled Pellets
The ASP-ECO allows the production scrap to be processed close to the point where it is generated.
This reduces the need for secondary material handling and allows the recycled material to be returned to the manufacturing process more efficiently.

The actual process in this application is:
HDPE Preform Waste → Shredding → Forced Feeding → Melting & Extrusion → Filtration → Air-Ring Pelletizing → Recycled HDPE Pellets
The entire process is integrated into the ASP-ECO system.

HDPE preforms are relatively rigid and have an irregular shape.
They are therefore not suitable for direct feeding into the extrusion section without prior size reduction.
The ASP-ECO integrates a low-speed, high-torque shredding system at the front of the machine.
The shredding stage reduces the size of the HDPE preform waste and prepares it for stable feeding into the extrusion section.
The purpose of this stage is primarily:
• Size reduction 
• Material preparation 
• Stable feeding 
• Continuous processing 
This allows the preform waste to move directly into the following processing stage without requiring a separate external crusher or shredder.

After shredding, the prepared HDPE material is transferred to the forced feeding section.
The ASP-ECO uses a controlled feeding system to continuously push the material into the extrusion section.
This is particularly important for an integrated recycling system because the shredding and extrusion processes need to operate continuously.
The system also includes feeding options such as:
• Belt conveyor 
• Traction rollers 
• Manual feeding port 
These components help maintain a controlled material flow into the recycling system.

The prepared HDPE material then enters the single-screw extrusion system.
The current ASP-ECO configuration presented in this application uses:
• Ø80 mm screw 
• L/D 15 
The extrusion section melts and plasticizes the shredded HDPE material before filtration and pelletizing. 
The purpose of this stage is to transform the solid shredded preform material into a homogeneous plastic melt suitable for downstream filtration and pelletizing.

After plasticization, the molten HDPE passes through the filtration section.
The purpose of filtration is to remove impurities from the melt before pelletizing.
For this application, the ASP-ECO uses a manual screen changer.
The filtration stage helps improve the consistency of the recycled material before it enters the pelletizing section.

After filtration, the molten HDPE enters the pelletizing section.
The ASP-ECO uses an air-ring pelletizing system to convert the filtered melt into recycled HDPE pellets.
The pelletizing stage produces a more uniform and manageable recycled material form.
The final product can then be collected and transferred back into the manufacturing process according to the customer's production requirements.

One of the main characteristics of this application is its closed-loop production concept.
Instead of sending production scrap to a separate recycling process, the material can be processed directly within the manufacturing plant.
The simplified material flow is:
HDPE Preform Production → Production Scrap → ASP-ECO In-Plant Recycling → Recycled HDPE Pellets → Return to Production
This allows manufacturers to recover value from their own production scrap while reducing the amount of material that needs to leave the production facility.

For relatively clean production scrap, using a large standalone recycling line is not always necessary.
The ASP-ECO combines several processing stages into one compact system: 
• Shredding
• Feeding
• Extrusion
• Filtration
• Pelletizing
This integrated configuration reduces the number of separate machines and intermediate conveying stages required.
For manufacturers with limited floor space or relatively small amounts of production scrap, this makes the system particularly suitable for in-plant recycling applications.

The main value of this application is not simply converting HDPE waste into pellets.
It is the ability to recycle production scrap close to the point where it is generated.
1. Immediate Waste Recovery
Production scrap can be processed without long-term accumulation.
2. Reduced Secondary Handling
The material does not need to be repeatedly transported between the production area and a separate recycling area.
3. Compact System Design
Shredding, extrusion, filtration, and pelletizing are integrated into one system.
4. Reduced Floor-Space Requirement
The integrated design requires less space than a conventional multi-machine recycling setup.
5. Material Recovery
Clean HDPE production scrap can be converted back into recycled HDPE pellets.
6. Closed-Loop Production
The recycled pellets can be returned to the manufacturing process according to the customer's material and product requirements.

The complete application can be summarized as:
Defective HDPE Preforms / Production Scrap → Integrated Shredding → Forced Feeding → Melting & Plasticizing → Melt Filtration → Air-Ring Pelletizing → Recycled HDPE Pellets
The entire process takes place within the compact ASP-ECO system.
This makes the solution suitable for manufacturers looking to establish an in-plant recycling loop for their HDPE preform production scrap.

This application demonstrates the use of the ASP-ECO integrated recycling system for HDPE preform production scrap.
The main challenge is not the contamination typically associated with post-consumer waste, but rather the need to efficiently handle clean production scrap without accumulating, transporting, and separately processing it.
The ASP-ECO addresses this requirement by integrating:
Shredding → Forced Feeding → Extrusion → Filtration → Pelletizing
into one compact system.
With a capacity of approximately 50–70 kg/h, the system converts HDPE preform production scrap into recycled HDPE pellets directly within the manufacturing plant.

If your HDPE preform production generates clean defective preforms, startup scrap, or changeover waste, an in-plant recycling system can help convert this production scrap back into usable recycled HDPE pellets.
The ASP-ECO integrates:
Shredding → Forced Feeding → Extrusion → Filtration → Air-Ring Pelletizing
in one compact system with a processing capacity of approximately 50–70 kg/h.
Contact ACERETECH to discuss your in-plant HDPE recycling application.