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A cartridge blister is a thermoformed plastic tray with one or more shaped cavities that hold a cartridge in place — the insert that sits inside a printed carton, or the tray that presents the cartridge on its own. We form cartridge blisters and the printed packaging around them at our Wenzhou factory from 100 pcs, with free design and free proofing, quotes back within 24 hours, samples in 1–3 business days and bulk in 7–15 business days. If you need blister tray packaging formed to a cartridge and matched to its carton, this is where to start.

What a Cartridge Blister Has To Do

A blister is a fit problem before it is a packaging format, and three things decide whether it works.

The cavity has to grip, not just contain. A cartridge that sits loosely in an oversized cavity still moves. We shape the cavity so the barrel is held along its length, with the grip at two or three points rather than one, which keeps the cartridge straight without pressing on the end seals.

The tray has to hold its shape through handling. A thermoformed tray that flexes lets the cartridge work loose. The material thickness and the draw depth both matter: a deep cavity in a thin sheet thins at the corners, and that is where a tray fails first. We set the material grade from the cavity geometry rather than from a default sheet.

The tray has to fit the carton. A blister is only useful if the carton closes over it. We dimension the tray and the carton together, so the finished assembly goes into the box without forcing the tuck and without a gap that lets the tray slide.

Why thermoformed rather than folded card

A folded card insert is cheaper and fine for a single, stable item. A thermoformed blister is chosen when the cartridge must not move at all, when the cavity has to be visible through the box, when the insert needs to be wiped or cleaned, or when several cartridges ship together. Thermoforming also lets us make a cavity in a shape a folded card cannot hold, which is usually what decides the question.

Thermoformed Blister Tray: How the Cavity Is Built

The cavity is the whole job, and it is built from the cartridge rather than from a catalogue size.

Starting from the cartridge dimensions

We need the cartridge’s outer diameter, its overall length, and its widest point, which is often a flange, a cap or a connector rather than the barrel. From those numbers we set the cavity’s length, its width and its depth, plus the clearance the cartridge needs to drop in without forcing. A cavity that is 0.5 mm tight will grip too hard and stress the cartridge; one that is 1 mm loose lets it rattle.

Draw depth, draft and wall thickness

Thermoforming stretches a sheet over a mould, so a deep cavity draws the material thinner at the base and the corners. We control that by choosing the sheet thickness for the draw, and by keeping the walls drafted so the part releases cleanly rather than tearing. If a cartridge needs a very deep cavity, the honest answer may be a two-part tray or a different insert, and we will say so at the drawing stage.

Single-cavity and multi-cavity trays

A single-cavity tray is the most common request for one cartridge in a retail carton. A multi-cavity tray holds several cartridges with a wall between each cavity so they never touch, and it is the format used for multi-packs and for shipping. The spacing between cavities is set by the tray’s rigidity: cavities too close together leave a thin wall that flexes.

Materials and Finishes for a 3ml Cartridge Plastic Blister Tray

The material decides how the tray looks and how it survives.

Clear PET is the default for a 3ml cartridge plastic blister tray. It shows the cartridge, takes a clean fold line, and reads as a premium insert. Clear trays are usually combined with a printed carton so the branding lives on the box rather than on the tray.

Opaque or coloured sheet is chosen when the tray is part of the design rather than a hidden insert, or when the cartridge should not be visible before purchase. It can be produced in a range of tints.

Printed or labelled trays are used where the tray carries a logo or a batch line. The print can be applied to the flat area between cavities, which is the only surface that reads cleanly after forming.

Finish is mostly a function of the material and the mould rather than a coating step. A high-polish mould gives a glossy tray; a matte-textured mould gives a soft-touch look that hides scuffs from handling. If you want a printed carton around the tray, the same proofing round covers both, so the colour on the box matches the insert.

Blister Tray Packaging With a Printed Carton

A blister is almost always part of a set: the tray that holds the cartridge, the carton that closes over it, and often a label or a card. Buying those from one supplier removes the most common source of mismatch.

If the carton is dimensioned by one supplier and the tray by another, the two are designed independently and the assembly either jams or rattles. Because we form the tray and print the carton from the same plant, the tray-to-carton tolerance is our problem rather than yours, and one artwork approval covers the whole set.

It also changes the timing. Coordinating a tray maker and a printer usually means two lead times stacked in sequence. Here the tray and the carton run to the same schedule, so a cartridge project with a formed tray and a printed carton still finishes inside the 7–15 business day window after sample approval.

If you already have a carton supplier you are happy with, we can supply the blister tray only — you do not need to move the whole job to work with us.

Low MOQ, Tooling and How the Order Runs

Boxes, cards and plastic trays start at 100 pcs; labels start at 1,000 pcs. For a thermoformed part, the practical constraint is the mould rather than the sheet, so the minimum run is set where the forming setup works properly.

What we need to quote a blister

The cartridge’s outer diameter, its overall length and its widest point; how many cavities per tray; the tray’s maximum footprint if it must fit an existing carton; and the quantity. The mould, the sampling and the lead time are confirmed with the quotation once the cavity has been drawn, because those follow from the geometry rather than from a fixed list.

The process, step by step

Send the cartridge dimensions and the quantity. You get a cavity drawing, a carton recommendation and a quote within 24 hours. Design is free: send artwork for the box and we place it on the dieline and return a proof, or if you have only a logo we propose one to three directions, normally within two to three days, and revise until it is right. A physical sample follows in 1–3 business days and bulk in 7–15 business days, behind four quality gates: incoming material, first article, in-process random sampling, and final AQL inspection with defects isolated. Delivery is by sea, air or express to the regions we serve; payment is T/T with a 30–50% deposit.

FAQ

What is the minimum order for a cartridge blister?
Plastic trays start at 100 pcs, the same as our boxes and cards; labels start at 1,000 pcs. Because a formed part needs a mould, the sampling step comes before the run and takes 1–3 business days.

Can you make a 3ml cartridge plastic blister tray with more than one cavity?
Yes. Multi-cavity trays with a wall between each cavity are a standard request. Tell us how many cartridges go in one tray and whether they travel upright or flat.

Which material do you recommend for a thermoformed blister?
Clear PET is the default because it shows the cartridge and takes a clean fold. Opaque or coloured sheet is used when the tray is part of the design rather than a hidden insert.

Will the tray fit a carton I already have?
Send the carton’s internal dimensions and we will draw the cavity to fit inside them. If the existing carton cannot physically take the tray, we will say so before the mould is made rather than after.

Do you supply the cartridge or fill the tray?
No. We are a packaging supplier, not a pharmaceutical manufacturer. We form the tray and print the carton around it. If you need matched components supplied with the packaging, tell us in the enquiry and we will confirm what we can provide.

How do I know the cartridge will seat properly before the run?
That is what the physical sample is for. Send the cartridge’s diameter, length and widest point; we return a cavity drawing within 24 hours and a formed sample in 1–3 business days, and you check the fit before bulk production starts.

Start a cartridge blister project — send your cartridge dimensions and target quantity, and you will have a cavity drawing, a carton recommendation and a price within 24 hours. Free design and free proofing; trays and boxes from 100 pcs; samples in 1–3 business days.