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Design Guide for PS / HIPS Thermoformed Drink Cups in food and beverage: 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 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; printed up to 6 colours. Materials most often specified are Polypropylene, Polyethylene Terephthalate, Polylactic Acid, Polystyrene, and the choice between them changes stiffness, temperature resistance, chemical behaviour and price.

In the food and beverage sector the decision is usually driven by food contact compliance and migration limits, with seal integrity as a secondary requirement. Typical end uses include bakery inserts, takeaway containers, ready meal trays.

Key Material Properties

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

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

Polystyrene is frequently the default selection here: HIPS is the default thermoforming sheet for food packaging and appliance liners.

Design Rules for Thermoformed Parts

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

  • Leave a flat sealing flange of at least 6 mm when the pack has to be heat sealed or lidded.
  • 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.
  • Add ribs, steps or kiss-offs instead of increasing overall gauge to gain stiffness.
  • Design uniform wall thickness by avoiding abrupt depth changes in the same cavity.

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

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

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.

  • In-line thermoforming
  • Rim curling
  • Plug assist forming
  • Printing

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

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

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

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

Frequently Asked Questions

Can you produce thermoformed drink cups in Polystyrene?

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.

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 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.

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 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.

Conclusion

Our team supplies thermoformed drink cups to food and beverage customers worldwide, with samples, material certificates and full inspection reports available before mass production.

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