REnato Lab

Transway: Plastic Remanufacturing




Technological feasibility and economic benefits limit the degree of which companies are willing to reuse defective products and scrap materials. In this project, working with Transway inc, REnato lab aim to provide our client a solution grounded by principles of circular design. By utilizing the color coding of polyamide (PA) and thermoplastic polyurethane (TPU) components of our client’s product, we aim to maximize the purity of material recovery, allowing easy reintegration into the supply chain and reducing overheads.


Maximize efficiency parameters for crushing and sorting of two-color injection molding products

Assess the suitability of PA properties as a reused material

Evaluate the benefits of developing a two-color injection molding product recycling chain



Current state of product:

This type of product uses black PA and colored TPU for injection molding. The resulting composite material waste accounts for the largest proportion in mass, but its lower price point underlies its need for interventions.

PA reuse modeL:

By adjusting the proportion of PA regrind for injection molding, we hope to find the perfect material ratio that maximizes recovery efficiency from color sorting while maintaining product qualities and reducing the cost of raw materials.




Strategy Research

Develop plan of action, experimental design and gauging technical feasibility. Prepare workflow by connecting plastic grinding, color sorting, and granulation test contractors

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Broken waste

Composite material waste is crushed into different particle sizes


Color sorting

Sorting waste chips by color to optimize particle size, sorting rate, and plastic purity

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Sample testing

Smelting granulation

Create test samples

Conduct quality assessments to ensure that the solution satisfies objectives

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report results

Establishment of optimization parameters for crushing and sorting

Test sample mechanical properties suitability

Overall reuse chain assessment


Key Milestone


Week 1

Strategy Research

Experimental design, organization of collaborators

Week 2

Broken waste

Waste grinding treatment, particle size screening

Week 4

Color sorting

Particle sorting, parameter optimization

Week 5

Sample test

Granulation proofing, property testing

Week 7

Adjustment assessment

Adjust accordingly based on initial test results, Overall assessment

Week 10

Project report

We aim to maximize the purity of material recovery, allowing easy reintegration into the supply chain and reducing overheads.