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Design Guide for PVC Trapped Blister Carded Packaging 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.

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 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 standard pegboard hole patterns; gauge 0.25 to 0.50 mm; card sizes to 250 x 400 mm. Materials most often specified are Polystyrene, Polyethylene Terephthalate, Polyvinyl Chloride, Recycled PET, 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 promotional packs, dump bins, pegboard blisters.

Key Material Properties

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

MaterialDensityTensile strengthService temperature
Recycled PET1.35-1.40 g/cm³45-65 MPa-40°C to 70°C
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

Polyvinyl Chloride is frequently the default selection here: PVC can be formulated from rigid pipe compound to soft medical grade by changing plasticiser content.

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.
  • Make corner radii at least equal to the sheet thickness; sharp corners are where holes start.
  • 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.
  • 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.

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
  • Polystyrene based: rigid and glossy
  • Recycled PET based: lower carbon footprint than virgin resin
  • 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

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

  • Vacuum forming
  • Heat sealing
  • Card printing
  • 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

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

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

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.

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.

Can you produce trapped blister carded packaging in Polyvinyl Chloride?

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.

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.

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.

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