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Design Guide for PET Thermoformed Drink Cups in retail and merchandising: 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.

The notes below come from day to day production and export work with overseas buyers.

Product Overview

This category covers a family of products rather than a single item. In practice a buyer defines thermoformed drink cups 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 gauge 0.35 to 1.00 mm; volume 100 ml to 700 ml; cold and hot fill grades. Materials most often specified are Polypropylene, Polystyrene, Polyethylene Terephthalate, Polylactic Acid, and the choice between them changes stiffness, temperature resistance, chemical behaviour and price.

In the retail and merchandising sector the decision is usually driven by shelf presentation and print quality, with stack strength as a secondary requirement. Typical end uses include pegboard blisters, dump bins, promotional packs.

Key Material Properties

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

MaterialDensityTensile strengthService temperature
Polylactic Acid1.24 g/cm³50-60 MPaup to 55°C (HDT)
Polypropylene0.90-0.91 g/cm³25-40 MPa-10°C to 100°C
Polyethylene Terephthalate1.35-1.40 g/cm³50-70 MPa-40°C to 70°C

Polyethylene Terephthalate is frequently the default selection here: High IV PET resin is the reason a 1.5 L bottle can be light yet hold carbonation pressure.

Design Rules for Thermoformed Parts

A few geometry decisions made on the drawing save weeks of tooling adjustment later.

  • Use a draft angle of at least 3 degrees per side so the part releases without vacuum locks.
  • 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.
  • Design uniform wall thickness by avoiding abrupt depth changes in the same cavity.
  • Keep the draw ratio moderate: deep cavities thin the sheet and force you to start with a thicker gauge.
  • Confirm the trim method early: steel rule die, CNC router or press tool each have different tolerances.

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

  • Polyethylene Terephthalate based: excellent barrier to CO2 and moisture
  • Polypropylene based: lowest density among commodity plastics
  • Polylactic Acid based: bio-based and industrially compostable
  • Polystyrene based: rigid and glossy

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.

  • Plug assist forming
  • Printing
  • Stacking and sleeving
  • In-line thermoforming

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 Thermoformed drink cups Correctly

Work through these points in order and most specification mistakes disappear.

  1. validate printing adhesion and rub resistance
  2. check rim strength for lid application
  3. confirm hot fill temperature and hold time
  4. confirm the cup fits standard lid sizes
  5. test denesting on the actual vending machine

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

Frequently Asked Questions

What is the minimum order quantity for thermoformed drink cups?

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 thermoformed drink cups in Polyethylene Terephthalate?

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.

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.

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.

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 retail and merchandising 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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