Express Plastic Bag Washing Line

Product Overview

The express plastic bag washing line is a customized, full-process pre-treatment production line for waste plastic films. It integrates crushing, washing, and dehydration into a single operation, effectively handling various types of film waste—including agricultural greenhouse films with high sand content, industrial packaging stretch films, BOPP/CPP waste films, express plastic bags, and adhesive composite films—through multi-stage processes that deeply remove sand, ink, and both light and heavy impurities. The final output is clean, dry film material ready to directly feed subsequent pelletizing processes. This production line can be custom-built to meet specific customer throughput requirements, with processing capacities ranging from 500 to 2,000 kg/h. Featuring high efficiency, cleanliness, water and energy savings, and a high degree of automation, it serves as core equipment for plastic recycling enterprises seeking to boost waste processing efficiency and reduce operating costs.

Technical Principles and Process Flow

This production line employs a five-stage closed-loop process—crushing, friction washing, flotation separation, rinsing, and squeezing—to seamlessly transform dirty waste film into clean, dry material:

1. Coarse Crushing Stage: Loose or whole-roll waste film is fed by a belt conveyor into a twin-shaft shredder, where it is coarsely cut into strips measuring 8–15 cm in length. This effectively breaks up large, bulky clumps, ensuring smooth feeding into downstream processes and preventing blockages or material jams.

2. Fine Crushing Stage: The strip-shaped material enters a high-speed pulverizer, which precisely cuts it into small fragments measuring 1–3 cm. This dramatically increases the material’s surface area, providing ample contact for thorough washing and facilitating the removal of impurities.

3. High-Speed Friction Washing: The fragmented material is fed into a horizontal friction washer, where spiral blades create high-speed collisions and self-friction. Combined with powerful flowing water, this process vigorously removes surface sand, dust, and loose ink. Removed impurities are discharged through side-wall screens along with wastewater, completing preliminary washing.

4. Flotation Separation and Rinsing: After friction washing, the material flows into a primary flotation tank. Leveraging differences in density, paper labels, airborne dust, and lightweight plastic impurities are carried away by the water flow, while heavier sand and metal debris settle at the bottom. Regular sludge removal ensures continuous operation, and the material undergoes further deep rinsing via a screw propulsion system within the tank, further eliminating residual contaminants.

5. Secondary Water Rinsing and Squeezing: Following flotation separation, the material proceeds to a secondary water-rinsing stage, where any remaining fine impurities are thoroughly removed. It then enters a screw-type dehydrator, where physical squeezing expels moisture. Simultaneously, a screen filters out residual fines, yielding clean, dry film material with a moisture content of ≤5%. This product can directly feed subsequent pelletizing processes without additional treatment.

Core Performance Parameters

1. Processing Capacity: 500–2,000 kg/h; production lines can be tailored to match customers’ specific throughput needs.
2. Sand and Dust Removal Rate: ≥96%, effectively eliminating sand, dust, and other contaminants from various film wastes.
3. Post-Squeezing Moisture Content: ≤5%; the resulting dry film material can directly enter pelletizing processes without further dehydration.
4. Water Recycling Rate: ≥88%, significantly reducing water consumption and wastewater treatment costs during production.

Key Advantages

1. High Efficiency, Water Savings, and Cost Reduction: With a water recycling rate of ≥88%, wash water is extensively reused, cutting water consumption per ton by 80% and substantially lowering water usage and subsequent wastewater treatment expenses. This meets dual demands for environmentally friendly production and cost control.

2. Full-Process Automation: Each stage is connected via automated conveyors, minimizing manual handling. The entire line requires only two operators, reducing labor costs by 65% while avoiding material loss and inefficiencies associated with manual transfers, thereby enhancing overall production continuity and stability.

3. Wear Resistance and Long Service Life: The friction chamber and screening components are crafted from wear-resistant materials, capable of enduring prolonged, high-intensity friction and abrasive impurities. This extends equipment lifespan, reduces maintenance frequency and replacement costs, and ensures long-term stable operation.

4. High Cleanliness, Ideal for Pelletizing: With a sand and dust removal rate exceeding 96%, the clean, dry film produced can directly feed pelletizing processes. This reduces mesh-changing frequency in downstream pelletizing by 75%, preventing clogging caused by contaminated film containing sand. Additionally, with a moisture content of ≤5%, it effectively avoids quality issues such as bubbling or broken strands during pelletization, improving the overall quality of pelletized products.

Core Product Value

1. Deep Impurity Removal, Solving Pelletizing Clogging Issues, Enhancing Process Stability and Product Quality.
2. High Water Recycling Rate, Significantly Reducing Water Costs and Wastewater Treatment Pressure, Enabling Environmentally Friendly and Energy-Efficient Production.
3. Fully Automated Operation, Minimizing Labor Input, Lowering Operating Costs, and Boosting Overall Production Efficiency.
4. Customizable Capacity Design, Adaptable to Different Enterprise Sizes, Offering High Flexibility.

Target Customer Groups

Film recycling plants, resource regeneration industrial parks, large-scale plastic recycling enterprises, and packaging film manufacturers—all these businesses typically handle substantial quantities of waste plastic film and have stringent requirements for washing efficiency, cleanliness, and cost control. This production line precisely meets their operational needs.

Application Scenarios

This production line is suitable for pre-washing and pre-processing various types of film waste, including high-sand agricultural greenhouse films, industrial packaging stretch films, BOPP/CPP waste films, express plastic bags, and adhesive composite films. Whether dealing with heavily sanded agricultural films or packaging films stained with ink and labels, its five-stage process delivers deep washing, providing high-quality raw materials for subsequent pelletizing operations.

Solutions to Industry Pain Points

1. Addressing Frequent Pelletizing Clogs Caused by Contaminated Film: With a sand and dust removal rate of ≥96%, this line effectively eliminates sand impurities, reducing mesh-changing frequency in downstream pelletizing by 75% and minimizing downtime associated with mesh changes, thus boosting pelletizing efficiency.

2. Improving Low Manual Washing Efficiency and Unstable Cleanliness: With fully automated operations, no manual washing is required. Standardized processes ensure consistent cleanliness across batches, while productivity far surpasses manual methods, dramatically accelerating overall waste processing speed.

3. Tackling High Water Consumption and Expensive Wastewater Treatment: With a water recycling rate of ≥88%, water usage per ton is reduced by 80%, cutting fresh water consumption and alleviating the burden and costs of wastewater treatment, helping enterprises achieve low-cost, eco-friendly production.

4. Preventing Pelletizing Quality Issues Caused by Excessive Moisture: A screw-type dehydrator keeps moisture content at ≤5%, enabling direct connection to pelletizing processes and avoiding quality problems such as bubbling or broken strands caused by overly wet material, thereby improving the pass rate and quality of pelletized products.

Frequently Asked Questions (FAQ)

Q1: What types of waste film can this express plastic bag washing line process?
A: It can handle high-sand agricultural greenhouse films, industrial packaging stretch films, BOPP/CPP waste films, express plastic bags, adhesive composite films, and other types of film waste, adapting to various materials and levels of contamination.

Q2: Can the production line’s capacity be customized?
A: Yes. This is a custom-made product with no fixed price; it can be tailored to meet specific customer throughput needs, offering processing capacities ranging from 500 to 2,000 kg/h to suit enterprises of different sizes.

Q3: What costs can this production line help reduce?
A: It can significantly cut water consumption costs, reducing water use per ton by 80%; it also lowers labor costs, requiring only two operators on the entire line, reducing labor expenses by 65%; additionally, it decreases mesh-changing costs and downtime in pelletizing processes, enhancing overall economic efficiency.

Q4: Can the dry film produced be used directly for pelletizing?
A: Yes. The clean, dry film has a moisture content of ≤5% and a sand and dust removal rate of ≥96%, so it can directly feed subsequent pelletizing processes without additional treatment, improving process integration efficiency by approximately 50%.