Recycling background

Polyester is a common synthetic fiber, which relies on petroleum for production. It is difficult to degrade and pollutes resources by landfilling and incineration after disposal. Traditional recycling methods have high costs or are difficult to utilize loose waste. Nowadays, “polyester fabric coagulation/compaction machines” can process loose waste, compress or melt it into high-density recycled materials, which can be used for new clothes, plastic products, etc., promoting resource recycling.

Core Machinery

Double shaft shredder
A “powerful equipment” for processing polyester waste containing hard impurities, with two high-strength alloy steel knife shafts rotating relative to each other. Through shearing, tearing, and squeezing, it efficiently crushes old clothing or industrial waste mixed with metal buckles, zippers, etc. into small pieces of 10-50mm uniform size, exposing impurities fully and facilitating subsequent cleaning and compaction; Compared to single axis, it has stronger crushing force and is more durable, making it a “pre-treatment tool” for waste materials containing hard impurities.

Agglomerator: It mainly compresses loose polyester waste such as old clothes and scraps through mechanical pressure (such as screw propulsion or hydraulic pressure), discharges internal air, and preliminarily aggregates them into blocks, increasing density (from 0.1-0.3g/cm ³ to 0.5-1.0g/cm ³), making it easy to transport and handle.

Densifier: On the basis of coagulation, the density is further increased, often combined with hot melt (heated to 200-260 ℃, close to the melting point of polyester), to melt and bond the fibers. After cooling, it forms high-strength, high-density blocks or particles (density can reach 1.3-1.5g/cm ³), which can be directly used for melt spinning or injection molding.

Recycling process

1. Raw material pretreatment and sorting classification
Adopting an automated sorting system to separate mixed waste materials (such as old clothing and industrial scraps), removing non polyester components such as cotton, metal, and plastic, and classifying them by color to ensure that the purity of the raw materials is ≥ 95%, laying the foundation for the stability of the performance of subsequent recycled materials.

2. Crushing, capacity reduction, and exposure of impurities
By using a dual shaft shredder (suitable for complex waste containing hard impurities), large pieces of waste are sheared, torn, and squeezed into uniform fragments of 10-50mm, achieving volume reduction and exposing surface pollutants, while simultaneously improving subsequent processing efficiency.

3. Melt plasticization and high-density molding
The crushed fragments are directly fed into the compactor through the conveying system, and are melted and plasticized by screw extrusion heating (200-260 ℃, close to the melting point of polyester). Under pressure, they are bonded into high-density blocks or particles, which can be directly used for melt spinning or injection molding, completing the closed-loop conversion from waste to raw materials.

Recycling advantages

Polyester waste recycling uses physical processes such as sorting, crushing, and compacting to convert waste into high-density recycled materials, achieving a closed-loop of “waste → raw materials”. Significant advantages: replacing raw materials and reducing petroleum resource consumption; Avoid incineration/landfill pollution and solve the problem of waste disposal;

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