What Chill Window Green does on pack
Chill Window Green is a thermochromic ink formulated for packaging applications where a colour change helps show that a product has reached or stayed within a chilled range. In normal room conditions the printed area sits in its base green state, then shifts as the pack cools down. That makes it useful on sleeves, labels, cartons and outer packs for dairy, cold drinks and fresh produce. For Durban humidity and coastal storage, the print needs to stay consistent through handling, carton packing and cold-chain movement, not just in a lab test.
The ink is supplied for use on suitable packaging substrates and can be set up to support simple consumer cues or more technical temperature indicators. We also assist with threshold tuning so the change point matches the pack and the product, rather than forcing one setting across every line.
Sizes, formats and print options
ThermoInk supplies Chill Window Green in production-ready formats for converter trials and full runs. The right option depends on the press setup, the substrate and the quantity you need to cover each month. We can prepare small trial batches for qualification, then move to production volumes once the colour and change point have been confirmed.
- Trial batch making for press approval and pack testing
- Production batches for ongoing packaging runs
- Colour matching to your approved pack artwork
- Threshold tuning for a specific chilled range
- Batch retain library support for repeat orders
- Security pattern design where anti-counterfeit detail is needed
Options can include different print densities, window sizes and compatibility settings for flexo, screen or coating applications. If you are running multiple pack sizes, we can set the same visual cue across a 250 ml carton, a 1 litre bottle label or a produce tray lidded pack, then confirm repeatability during press startup.
Where Chill Window Green suits best
This product suits chilled packaging where the brand wants a visible temperature cue without adding extra components to the pack. It is commonly used on beverage, dairy and fresh produce packaging, and also on promotional packs where the cold status must be clear on shelf or in transit.
- Chilled juice, water and flavoured drinks
- Milk, yoghurt and cultured dairy packs
- Fresh produce wraps, punnets and trays
- Retail multipacks for cold-chain distribution
- Contract packer work for national brands
It is especially useful where stores have variable fridge performance or where products move through short periods outside refrigeration during loading, pallet checking or shelf filling. The change point gives your team and the shopper a quick visual reference, which can help reduce confusion around temperature-sensitive items.
Press setup, installation and utility needs
Chill Window Green is printed into the pack production line, so it does not need a separate power supply, gas connection or special on-site machine. The main requirement is correct press setup, a suitable substrate and enough curing or drying capacity for your production speed. We support converters in Jacobs, Pinetown, Prospecton and nationwide with startup checks, adhesion tests and rub resistance checks before full release.
For best results, we recommend confirming coating compatibility before the job goes live. That includes checking whether your varnish, laminating film or overprint layer affects the temperature response. On some lines, a small change in drying temperature or press speed can shift the final result, so it is worth verifying during the first run not after the pallet leaves the floor.
- No separate electrical or gas connection is needed for the ink itself
- Requires compatible printing equipment and approved substrate
- Needs line testing for colour hold, change point and rub resistance
- Best checked during press startup support and first-off approval
Care, storage and repeat-run servicing
Thermochromic inks need sensible storage and careful handling if you want repeatable results. Keep containers closed when not in use, store them away from direct heat and avoid leaving opened material in a warm print room for long periods. In summer humidity, especially around Durban South, keep an eye on open time and viscosity because poor handling can affect transfer and colour consistency.
For repeat orders, our batch retain library helps keep a record of approved samples and settings so later production can match the original run more closely. We can also help with production troubleshooting if the print starts to shift, the window is too sensitive or the pack finish changes after a substrate swap.
- Store in a cool, dry area away from direct sunlight
- Keep lids sealed to limit contamination and drying at the rim
- Confirm compatibility after any change in board, film or coating
- Use retain samples for later colour and threshold checks
What to check before you place an order
Before ordering Chill Window Green, send through the pack spec and let us know the substrate, print process and target chilled range. That gives us enough detail to advise on the right threshold, window size and testing method. If you are printing for supermarkets, wholesalers or export customers, it helps to confirm any customer rules on visual indicators, traceability or security marking too.
Please check these points before sign-off:
- Pack type and substrate, including film, board or label stock
- Target temperature range and how the indicator should behave
- Required print method and line speed
- Whether security pattern design is needed alongside the colour cue
- Any overprint varnish, lamination or coating on the final pack
- Quantity, delivery area and whether you need trial batches first
If your pack is going to Jacobs, Cape Town, Gqeberha, Johannesburg, Pretoria or another converter site, we can plan delivery around your production slot so the material arrives when the line is ready. That keeps the first run organised and reduces waste.
Key facts
| Product type | Green thermochromic ink for chilled packaging |
|---|---|
| Primary use | Temperature cue for beverage, dairy and fresh produce packs |
| Change behaviour | Shifts appearance as the pack reaches the set chilled range |
| Print compatibility | Suitable for confirmed flexo, screen or coating applications |
| Utility needs | No separate power or gas connection for the ink itself |
| Support services | Colour matching, threshold tuning, tests and press startup support |
