Design Guide for PC/ABS Alloy Twin Sheet Thermoformed Products in logistics and warehousing: Draft, Radii and Draw Ratio

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

This guide is written for engineers, purchasers and project managers who need a practical answer, not a resin data sheet.

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 integrated mounting bosses; hollow double wall structures; large panels over 2000 mm. Materials most often specified are High Density Polyethylene, Polypropylene, Acrylonitrile Butadiene Styrene, Polycarbonate, and the choice between them changes stiffness, temperature resistance, chemical behaviour and price.

In the logistics and warehousing sector the decision is usually driven by stackability and returnability, with traceability as a secondary requirement. Typical end uses include returnable trays, dunnage trays, parts supermarket trays.

Key Material Properties

These figures are typical for commercial grades and should be confirmed against the supplier's certificate for your specific lot.

PC/ABS Alloy is frequently the default selection here: PC/ABS is the standard engineering alloy for electronics housings that must survive a drop test.

Design Rules for Thermoformed Parts

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

• Design uniform wall thickness by avoiding abrupt depth changes in the same cavity.
• Confirm the trim method early: steel rule die, CNC router or press tool each have different tolerances.
• Use a draft angle of at least 3 degrees per side so the part releases without vacuum locks.
• Make corner radii at least equal to the sheet thickness; sharp corners are where holes start.
• Add ribs, steps or kiss-offs instead of increasing overall gauge to gain stiffness.
• 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

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

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

The route below is the one most factories use for this type of part.

• Assembly
• Pressure forming
• Twin sheet forming
• Welding

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

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

Frequently Asked Questions

What tolerance can be achieved?

Standard production tolerance follows the relevant ISO or DIN tolerance class for the process; tighter tolerances are possible after machining or grinding, but they add cost. Define the tolerance only on the functional dimensions.

Can you produce twin sheet thermoformed products in PC/ABS Alloy?

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.

How do you control colour consistency?

Colour is controlled with a masterbatch reference approved by the customer, and every production lot is checked against the approved sample under standard lighting before shipment.

Which certifications can you provide?

We can provide ISO 9001 quality system documentation, material certificates, RoHS and REACH statements, and where applicable food contact, flame retardancy or drinking water approvals. Tell us your target market and we will match the document set.

Conclusion

Share your specification and quantity with us and we will recommend the most cost effective material, tooling route and packing method for your market.