How Volumetric Fillers Handle Juices with Pulp

Views: 3174 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. Progressive cavity pumps are often recommended for their ability to gently transport fluids with suspended solids, such as pulp juice, without causing damage to the pulp structure.
Key facts at a glance
Filling methodHot-fill, up to 85 C
Capacity range6,000-36,000 BPH at 0.2-2 L
ContainerHeat-resistant PET geometry, or glass
LineHot-fill monobloc with tunnel pasteuriser
ProductsJuice, tea, nectar, functional drinks
Key controlFill temperature, hold time, cap seal

How do you keep pulp and fibre moving through the line?

Pulp needs either a larger valve bore or a piston filler, and it needs continuous gentle agitation in the bowl. Dead corners in the product path settle fibre, then release it as a slug into the next bottle. Bowl geometry and return-flow design matter more than valve count here.

Progressive cavity pumps are often recommended for their ability to gently transport fluids with suspended solids, such as pulp juice, without causing damage to the pulp structure.

When is cold filling the better route?

Cold filling protects heat-sensitive flavour and colour and allows a lighter bottle. It needs either a preservative system or a validated cold chain, and it moves the microbial control to the product and the plant rather than to the filler. The decision is commercial before it is technical.

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 specification sheet for the Juice By Volumetric Filler carries the utility figures quoted here.

What does a glass juice line change?

Glass brings mass, breakage and a slower line. It also brings a closure decision: crown, lug or screw. A glass hot-fill line usually runs at a lower rate than the same filler on PET, and the difference is handling and inspection, not the valve.

Site requirements, air and water consumption sit with the Hotfill Type Filling Machine for Juice.

How is shelf life validated after a change?

With a storage trial on the actual product, bottle and closure, held at the intended temperature and sampled on a schedule. Changing the fill temperature, the bottle or the cap invalidates the previous result, which is why those three are treated as one specification.

The same question is worked through from another angle in How Combibloc Fillers Improve Efficiency in Juice Production.

How does pulp size affect the filler choice?

Pulp decides the bore and the valve seat, and it decides whether a piston is needed. A filler set for clear juice bridges on pulp and the dose falls short. Specify the largest particle in the product before the machine is quoted.

How to read the numbers. All capacity numbers here are the ranges published in the product specification. 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.

Can hot-fill juice run in standard PET bottles?

No. Standard PET softens and deforms at fill temperature. The bottle needs a heat-resistant geometry, and the mould and preform are part of the project, not an afterthought.

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.

Why does the bottle panel after filling?

Usually fill temperature above the bottle rating, or a vacuum that forms as the product cools. Check the fill temperature against the bottle specification and the cap seal before changing the cooling profile.

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. Cap seals and valve O-rings are the first wear items on a hot line.
  3. Cold filling moves the microbial control from the filler to the product and the plant.
  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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