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Design Guide for PP Twin Sheet Thermoformed Products in automotive and mobility: Draft, Radii and Draw Ratio

2026-10-02 Plastic News 0 views

Thermoforming rewards designs that respect how a heated sheet stretches. These rules prevent most tooling rework and most thickness complaints.

Use it as a working checklist when you write your next enquiry.

Product Overview

This category covers a family of products rather than a single item. In practice a buyer defines twin sheet thermoformed products by three things: the base resin, the format or dimension, and the performance or certification level it has to meet. Typical options in this category include textured both sides; hollow double wall structures; large panels over 2000 mm. Materials most often specified are Polycarbonate, Acrylonitrile Butadiene Styrene, Polypropylene, PC/ABS Alloy, and the choice between them changes stiffness, temperature resistance, chemical behaviour and price.

In the automotive and mobility sector the decision is usually driven by dimensional stability and heat resistance, with impact strength as a secondary requirement. Typical end uses include dunnage trays, under body shields, line side trays.

Key Material Properties

Typical values for a general purpose grade are listed below; filled, stabilised and speciality compounds will differ.

MaterialDensityTensile strengthService temperature
PC/ABS Alloy1.13-1.15 g/cm³45-60 MPa-30°C to 110°C
High Density Polyethylene0.94-0.97 g/cm³20-32 MPa-50°C to 80°C
Polycarbonate1.20 g/cm³55-70 MPa-40°C to 120°C

Polypropylene is frequently the default selection here: PP is the lightest mainstream packaging resin and keeps its shape under repeated flexing.

Design Rules for Thermoformed Parts

Thermoforming rewards designs that respect how the sheet stretches. These rules prevent most tooling rework.

  • Add ribs, steps or kiss-offs instead of increasing overall gauge to gain stiffness.
  • Leave a flat sealing flange of at least 6 mm when the pack has to be heat sealed or lidded.
  • Make corner radii at least equal to the sheet thickness; sharp corners are where holes start.
  • Confirm the trim method early: steel rule die, CNC router or press tool each have different tolerances.
  • Keep the draw ratio moderate: deep cavities thin the sheet and force you to start with a thicker gauge.
  • Avoid undercuts unless the tool has moving sections, which adds cost to every cycle.

Send these rules to your designer together with the sheet gauge and the target cycle time; most tooling modifications come from ignoring draft and corner radii.

Common Grades and Variants

  • Acrylonitrile Butadiene Styrene based: high impact toughness
  • Polypropylene based: lowest density among commodity plastics
  • Polycarbonate based: outstanding impact strength (250x glass)
  • PC/ABS Alloy based: balances PC toughness with ABS processability

Beyond the base resin, most suppliers offer UV stabilised, food contact, flame retardant, anti-static and recycled content versions of the same product. Ask which additive package is included, because it is often the difference between a part that lasts three years and one that lasts ten.

Processing and Finishing Options

Processing method drives both cost and performance, so it should be fixed early in the design.

  • Pressure forming
  • Cnc trimming
  • Twin sheet forming
  • Assembly

Secondary operations such as printing, welding, machining and assembly are often cheaper to do in the same factory, and they reduce the risk of mismatch between components.

How to Specify Twin sheet thermoformed products Correctly

These are the criteria that actually predict whether the part will perform in service.

  1. check flatness of large panels
  2. confirm the pinch-off design with your moulder
  3. validate the weld strength with a burst or drop test
  4. design mounting features into the twin sheet structure
  5. specify wall thickness on both sheets

Send this list to your supplier with the drawing and you will receive comparable quotations from every factory you contact.

Frequently Asked Questions

Do you offer samples?

Yes. Standard samples are normally free of charge and shipped within three working days; custom samples are charged at cost and credited against the first production order.

What is the minimum order quantity for twin sheet thermoformed products?

For standard sizes and colours the minimum is usually one pallet or one production run; for custom tooling the economic minimum depends on the tooling cost amortised over the expected volume. Send us your annual volume and we will calculate the break even point.

Can you produce twin sheet thermoformed products in Polypropylene?

Yes. {mat1} is one of our regular materials for this item, and we can supply virgin, modified and certified grades with full traceability. Material certificates and test reports are issued per batch.

How long does tooling and sampling take?

A new tool typically takes 25 to 45 days depending on cavity count and complexity, followed by T1 samples within one week. Existing tools can usually start production within 10 to 15 days of order confirmation.

What packing and shipping options are available?

Standard packing is export cartons on fumigation-free pallets, with custom labelling, barcode and retail packing available. We also handle consolidated containers and door to door delivery.

Conclusion

If you are planning a new automotive and mobility project, send us your drawing, annual volume and target properties, and we will come back with a material proposal, a tooling plan and a budget quotation.

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