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Design Guide for rPET Slide Blister and Sleeve Packaging in electronics and electrical: 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 slide blister and sleeve 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 printed card sleeves; friction fit and locked designs; hanging hole options. Materials most often specified are Polystyrene, Polyethylene Terephthalate, Recycled PET, Polyvinyl Chloride, and the choice between them changes stiffness, temperature resistance, chemical behaviour and price.

In the electronics and electrical sector the decision is usually driven by ESD protection and dimensional accuracy, with cleanliness as a secondary requirement. Typical end uses include accessory blisters, device inserts, component trays.

Key Material Properties

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

MaterialDensityTensile strengthService temperature
Polyvinyl Chloride1.38-1.45 g/cm³40-55 MPa-10°C to 60°C
Polystyrene1.04-1.06 g/cm³30-50 MPa-20°C to 70°C
Recycled PET1.35-1.40 g/cm³45-65 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

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

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

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

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.

  • Printing
  • Die cutting
  • Vacuum forming
  • Sleeve forming

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 Slide blister and sleeve packaging Correctly

Use this checklist when comparing two or three supplier quotations.

  1. avoid over-tight fits that split the sleeve
  2. test the pack after vibration and drop
  3. check the fit tolerance between sleeve and blister
  4. validate hanging strength for retail
  5. confirm the sleeve board grade and coating

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

Frequently Asked Questions

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 slide blister and sleeve 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.

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 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.

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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