Recycling systems for stable material cycles.

STF develops and integrates systems for the mechanical preparation of plastic streams. From input material through size reduction, washing, separation, sorting and conveying, the result is a process line matched to material, throughput and target quality.

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Turnkey System concepts from material input to defined output
Modular Machines, conveying technology and sorting matched to the process task
Material-specific Design based on input fraction, contamination and target quality

Plant expertise

From material stream to reliable recycling line.

A good plastic recycling system is not a single aggregate. It is a clearly managed process chain in which every transfer point, every separation stage and every machine contributes to the required material objective.

Plant engineering

From layout to commissioning

STF plans recycling systems as an integrated process line: mechanically robust, serviceable and matched to the actual material task.

Circularity

Consider input, process and output together

Material fraction, contamination, throughput and target quality determine the technical design of the individual process steps.

Components

Modular technology for flexible lines

Size reduction, washing, separation, sorting, conveying and storage are combined as required and integrated into existing or new systems.

Quality

Stable recyclate quality as the objective

The system is designed for a usable material stream that reliably supports downstream sorting, washing or extrusion processes.

Process architecture

STF plans the line backwards from the output.

Target quality, downstream processing and available input streams determine how the system is configured. This results in solutions that not only function technically, but also remain understandable, maintainable and expandable in ongoing operation.

Material analysis Fractions, contaminants, moisture, particle sizes and target products form the basis for the design.
Mechanical robustness Machines, transfer points and conveying sections are planned for industrial loads and good accessibility.
Quality assurance Sorting, separation and process management are combined so that the output remains permanently usable.
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Bird's-eye view of a recycling site with material and process areas
At STF, recycling systems are planned as an overall process with clear material flows.

Systems & components

Sorting and washing line in an interactive system image.

The marked text areas in the image link directly to the respective components. This makes the process chain visible as an integrated line rather than a simple module list.

Layout rendering of an STF sorting line for post-consumer plastics with marked clickable components
Sorting line: Feeding, singulation, conveying, mechanical separation, label preparation and quality control as a coordinated process.

Material streams

Recycling technology for demanding plastic fractions.

The available system and sorting images show typical fields of work: bottle streams, mixed materials, conveying technology and sorting during ongoing operation.

Plastic bottles on a conveyor belt in a recycling system

Bottle and rigid-plastic streams

For PET, PE, PP and mixed fractions, the interaction between preparation, sorting and clean process management is decisive.

Mixed waste stream on conveying technology

Heterogeneous input materials

Recycling systems must handle changing qualities while maintaining a clear process logic.

Plastic bottles are sorted on conveying technology

Sorting as a quality stage

Optical sorting complements mechanical preparation where material purity and target quality make the difference.

Project workflow

From the first material sample to a stable line.

The technical solution is developed step by step from the material and the required output. This makes requirements, interfaces and operating objectives visible at an early stage.

  1. 01

    Understand the material stream

    Input material, contaminants, particle sizes, target products and site conditions are jointly evaluated.

  2. 02

    Design the process chain

    The requirements are translated into a plant layout with suitable machines, transfer points, media connections and operating points.

  3. 03

    Integrate components

    Mechanical systems, conveying technology, washing technology, separation technology and optical sorting are implemented as an overall process.

  4. 04

    Stabilize quality

    Commissioning, parameterization and service support plant operation focused on usable recyclate quality.

System expertise

Recycling systems benefit from the knowledge of the entire STF Group.

STF combines mechanical engineering, sorting technology and material understanding. This is especially valuable when systems are not considered in isolation, but as part of a cycle of preparation, quality assurance and downstream processing.

Engineering

Design based on material objective

The process chain is aligned with the material that is to be further processed or marketed at the end.

Integration

Mechanics and process from a single source

Machines, platforms, conveying technology, transfer points and operating areas are planned as an integrated plant layout.

Circularity

Interface to downstream processing

Recyclate quality, sorting and extrusion requirements are considered early so that preparation creates real added value.

Input Material stream
Process Preparation
Output Recyclate quality

Plan a plastic recycling system

Do you want to process a material stream or further develop an existing line?

Talk to STF about input material, target quality, plant layout and the next meaningful project step.

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