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Design Guide for PS / HIPS Face Seal Blister Packaging in toys and games: 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.

Everything here can be checked on a real sample before you commit to a production order.

Product Overview

This category covers a family of products rather than a single item. In practice a buyer defines face seal blister packaging 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 sheet gauge 0.20 to 0.60 mm; single and multi cavity layouts; cavity depth up to 60 mm. Materials most often specified are Polypropylene, Polyethylene Terephthalate, Polystyrene, Recycled PET, and the choice between them changes stiffness, temperature resistance, chemical behaviour and price.

In the toys and games sector the decision is usually driven by child safety and presentation, with durability as a secondary requirement. Typical end uses include game inserts, craft set packs, action figure blisters.

Key Material Properties

The table below summarises the values that usually decide the material choice.

MaterialDensityTensile strengthService temperature
Polystyrene1.04-1.06 g/cm³30-50 MPa-20°C to 70°C
Polyvinyl Chloride1.38-1.45 g/cm³40-55 MPa-10°C to 60°C
Polypropylene0.90-0.91 g/cm³25-40 MPa-10°C to 100°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

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

  • Avoid undercuts unless the tool has moving sections, which adds cost to every cycle.
  • Design uniform wall thickness by avoiding abrupt depth changes in the same cavity.
  • 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.
  • Confirm the trim method early: steel rule die, CNC router or press tool each have different tolerances.
  • Add ribs, steps or kiss-offs instead of increasing overall gauge to gain stiffness.

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

  • Recycled PET based: lower carbon footprint than virgin resin
  • Polyvinyl Chloride based: inherently flame retardant
  • Polyethylene Terephthalate based: excellent barrier to CO2 and moisture
  • 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

Each step below has its own control points, and skipping one of them is where most defects start.

  • Vacuum forming
  • Pressure forming
  • Sheet extrusion
  • Die cutting

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 Face seal blister packaging Correctly

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

  1. ask for a drop test on the finished pack
  2. leave a flat flange for heat sealing
  3. check the corner radius against the sheet gauge
  4. verify recycled content documentation if rPET is used
  5. confirm the sealing coating matches the card

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 face seal blister packaging?

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 face seal blister packaging 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.

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.

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.

Conclusion

Our team supplies face seal blister packaging to toys and games customers worldwide, with samples, material certificates and full inspection reports available before mass production.

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