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Design Guide for rPET Trapped Blister Carded 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.

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 trapped blister carded 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 gauge 0.25 to 0.50 mm; card sizes to 250 x 400 mm; standard pegboard hole patterns. Materials most often specified are Polyvinyl Chloride, Recycled PET, Polystyrene, Polyethylene Terephthalate, 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, collector windows.

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
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
Polyethylene Terephthalate1.35-1.40 g/cm³50-70 MPa-40°C to 70°C

Recycled PET is frequently the default selection here: Food-grade rPET requires a recognised recycling process plus solid-state polycondensation.

Design Rules for Thermoformed Parts

Apply these points before the tool is cut; after that every change costs tooling and time.

  • 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.
  • Use a draft angle of at least 3 degrees per side so the part releases without vacuum locks.
  • Avoid undercuts unless the tool has moving sections, which adds cost to every cycle.
  • Leave a flat sealing flange of at least 6 mm when the pack has to be heat sealed or lidded.
  • 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

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

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.

  • Heat sealing
  • Card printing
  • Die cutting
  • Hanging hole punching

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 Trapped blister carded packaging Correctly

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

  1. match the heat seal coating to the card stock
  2. use anti-static material for electronics
  3. validate seal strength with a peel test
  4. check the card flatness after sealing
  5. confirm the peg hole pattern required by the retailer

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 trapped blister carded packaging in Recycled PET?

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 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.

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.

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 trapped blister carded 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.

Conclusion

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

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