Hotfill Juice in Glass: Cooling Tunnel and Tea-Side Differences

Views: 2005 Author: Howie SUN Publish Time:
Juice is a product-first decision: acidity, pulp and heat sensitivity choose the filling temperature, and the temperature chooses the bottle. By prioritizing precise temperature control, regular calibration, and proactive maintenance practices, bottling plants can enhance efficiency, reduce wastage, and improve overall operational performance.
Key facts at a glance
Filling systemHot-fill, up to 85 C
Output range6,000-36,000 BPH at 0.2-2 L
PackageHeat-resistant PET geometry, or glass
LineHot-fill monobloc with tunnel pasteuriser
ProductsJuice, tea, nectar, functional drinks
Key controlFill temperature, hold time, cap seal

Why does juice get filled hot instead of cold?

Hot filling does two jobs at once: it pasteurises the product on the way to the filler, and the residual heat sanitises the bottle and cap. That is why a hot-fill line can run an acidic juice without a separate bottle steriliser. The price is a heat-resistant bottle and a longer cooling tunnel.

Regularly monitor and control the temperature of the hotfill juice to ensure it meets the optimal filling temperature.

What does the fill temperature actually control?

Fill temperature and hold time together set the pasteurisation result. Below the target, shelf life is at risk; above it, the product cooks and the bottle deforms. The number belongs to the product and the bottle, not to the machine, and it should be written into the acceptance protocol with a tolerance.

Invest in efficient heat exchange systems to heat the juice to the required temperature before filling.

RouteTemperatureWhat it costs
Hot fillUp to 85 CHeat-resistant bottle and a cooling tunnel
Cold fill with preservativeAmbientFormulation constraint, not a machine constraint
Cold fill with in-line pasteuriserProduct-side onlySeparate pasteuriser and a closed filling zone
Hot fill in glassUp to 85 CGlass mass, slower line, higher transport cost

The Hotfill Type Filling Machine for Juice is the matching unit when this becomes a line project.

What breaks first on a hot-fill line?

Cap seals and filling valve O-rings, because they see the highest temperature every cycle. A seal that is fine on a water line at 20 C will harden in weeks at 85 C. The spare parts list should carry those two items in proportion to the number of valves, not as a single set.

The unit behind this configuration is the Juice By Volumetric Filler.

What does a tea line need that a juice line does not?

Tea usually needs finer filtration, deaeration to protect aroma, and a fill temperature that does not strip the volatile notes. Tea also clouds after cooling, so the clarification step is part of the product design, not a filling detail.

The same question is worked through from another angle in How to Choose Between Gravity and Piston Fillers for.

How to read the numbers. Capacity figures come from the specification range, and the range is wide by design. Hot-fill lines lose time to heat-up and cooling that a rated BPH does not include; plan on 0.65-0.85.

Frequently asked questions

What temperature is juice hot-filled at?

Up to 85 C, set per product and per bottle. The exact set point and tolerance belong in the product specification, because acidity, pulp content and bottle wall thickness all move it.

Does hot filling replace pasteurisation?

It replaces the bottle steriliser for acidic products, because the fill temperature and hold time do the microbial work. It does not replace correct product formulation or a validated hold tube.

How long does a hot-fill line take to reach temperature?

It depends on the hold tube volume and the heater capacity. The line is not production-ready until the return temperature is stable, so start-up time belongs in the daily plan rather than being discovered at shift start.

Can a hot-fill line run clear juice and pulp juice?

With a filter change and a different valve bore for the pulp, yes. Clear juice needs finer filtration, and pulp needs agitation in the bowl so the fibre does not settle.

Key takeaways
  1. Fill temperature is a product and package number, not a machine setting.
  2. Pulp needs bore and agitation, not more pressure.
  3. A change of fill temperature invalidates the shelf-life trial.
  4. Colour loss is a temperature and hold-time decision.
About the author
Written by the Sunswell engineering team - led by Howie SUN, Founder & CEO, with 14 years in filling and blow-moulding equipment R&D and turnkey project delivery across 71+ countries.
Last reviewed: 2026-08-28 . Reviewed by Sunswell engineering team
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