Automatic High Speed Liquid Nitrogen Dispenser Machine System

Q1  What is the difference between hot filling and cold aseptic filling for juice — which do you recommend and why?

Choosing the right filling technology is the most critical decision for your juice production line. It directly impacts your product's taste, shelf life, packaging costs, and logistics.

The Core Technical Difference

Hot Fill: hot filling is typically means filling temperature from 85°C to 95°C. in this way both the juice/tea and bottle are sterilized simultaneously. The bottle must withstand this heat without deforming. The bottle material cost is higher. But machine production line invest is lower.

Cold Aseptic Filling: the bottle, cap, and the environment separately sterilized(using steam or chemicals), then fill the bottle with a sterile, chilled product. The total invest is high. But bottle material is lower and can keep drink fresh taste well.

Q2  Can this line handle juices with pulp or fiber content, or is it only for clear juice?

This line is specifically designed for clear juice (e.g., apple, grape, clarified juice). It is not recommended for high-pulp or high-fiber juices such as orange, tomato, or smoothies, as pulp may cause clogging. For pulp-containing juices, we have special machine for it.

Q3  What sterilization method do you use — UHT, HTST, or tunnel pasteurizer?

1. UHT (Ultra-High Temperature) – Best for Aseptic Filling

Process: 135–150°C (275–302°F) for 2–5 seconds.

Application: Milk, plant-based beverages, dairy desserts, liquid eggs.

Advantage: Enables ambient storage (6–12 months) without refrigeration.

Equipment: Plate or tubular UHT sterilizer + aseptic filling system.

2. HTST (High-Temperature Short-Time) – Best for Chained Distribution

Process: 72–85°C (161–185°F) for 15–30 seconds.

Application: Fresh milk, juice, beer, ice cream mix.

Advantage: Better preserves flavor & nutrients; lower energy cost.

Shelf life: 2–6 weeks refrigerated.

3. Tunnel Pasteurizer – It is after filling pasteurizing.

Process: Multi-zone spray (preheat → pasteurization → cooling) at 60–98°C.

Application: Beer, cider, canned vegetables, pet food pouches, glass jars.

Advantage: Post-packaging sterilization; no aseptic filler required.

Q4  Does the line include a liquid nitrogen dosing system? What is the purpose of nitrogen injection in juice filling?

Yes, we offer an optional liquid nitrogen dosing system (LND) integrated with our filling lines — particularly for PET bottling water, juice, edible oil, non-carbonated drink can filling.
The system is fully synchronized with the filler speed and can be retrofitted to existing lines as well.

Liquid nitrogen (LN₂) dosing serves two critical purposes in juice and beverage filling:

1. Oxygen displacement – Extend shelf life & preserve quality

A small drop of LN₂ vaporizes inside the container headspace before sealing.

The expanding nitrogen gas pushes out oxygen (the main cause of oxidation, vitamin C loss, and color fading).

Result: Reduced dissolved oxygen (DO) → longer shelf life without adding preservatives.

2. Rigidity & stackability – Prevent paneling (for PET bottles)

Juice-filled PET bottles often collapse inward during cooling (vacuum effect).

LN₂ dosing adds a controlled internal pressure (1.5–3 bar) after capping.

Result: Bottles remain rigid, lightweight, and stackable for palletizing — no need for thicker plastic or vacuum panels.

For hot-fill juices: LN₂ replaces expensive vacuum panels or nitrogen flushing systems.
For ambient juices: LN₂ allows lightweighting (use 20–30% less PET material).

Q5  What bottle materials are supported — PET only, or also glass and HDPE?

For hot-filling machines, supported bottle materials typically include PET, glass, and HDPE, depending on the machine design and filling temperature.

PET: Suitable for hot-filling only with heat-set (crystallized) PET; standard PET cannot withstand high temperatures above 60°C.

Glass:Fully compatible with most hot-filling applications (juice, tea, etc.) due to excellent thermal resistance.

HDPE:Limited compatibility — only high-density polyethylene grades with high thermal stability (some up to 90–95°C) can be used for hot-filling. standard HDPE may deform

Q6  What is the filling temperature range for hot-fill juice products?

Hot-fill juice products typically have a filling temperature range of 80°C to 95°C (176°F to 203°F).

For optimal sterilization of the container and cap, most hot-fill applications target 88°C to 92°C (190°F to 198°F). The minimum temperature required to achieve commercial sterility without preservatives is generally 80°C (176°F).

Q7  How do you ensure the juice does not oxidize or change color during the filling process?

1. Minimize Oxygen Exposure

Use a fully enclosed filling system with inert gas flushing (e.g., nitrogen) to displace oxygen from the filling chamber and containers before and after filling.

Install a deaerator before filling to remove dissolved oxygen from the juice prior to heating.

2. Control Temperature & Time

Maintain a high filling temperature (80–95°C) for hot-fill, which sterilizes and reduces oxygen solubility.

Reduce product hold time between deaeration and sealing to limit oxidative reactions.

3. Optimize Equipment Design

Apply sanitary, low-shear valves and pumps to prevent air entrainment.

Use variable frequency drives to avoid excessive turbulence during filling.

Ensure splash-free filling nozzles to minimize foam and oxidation.

4. Add Antioxidants (if permitted)

Include ascorbic acid, erythorbic acid, or rosemary extract to inhibit enzymatic and non-enzymatic browning.

5. Bottle & Seal Integrity

Pre-heat containers to reduce thermal shock and condensation, which can trap oxygen.

Apply immediate capping after filling (≤2 seconds) with steam or nitrogen cap flushing.

Use oxygen-scavenging caps or liners for long-term color stability.

6. Cleaning & Maintenance

Regularly check for leaks in seals, gaskets, and pipe connections.

Clean filler bowls and nozzles to avoid caramelized juice residue (which promotes discoloration).1. Minimize Oxygen Exposure

Q8  What is the shelf life we can expect for juice products filled on your line without refrigeration?

For hot-fill juice line, the expected shelf life without refrigeration typically ranges from 6 to 12 months, depending on product acidity (pH < 4.2), filling temperature (≥80°C–95°C), bottle and cap sterilization, and barrier properties of the packaging material.

Q9  Can the same line be used for both still juice and carbonated juice drinks?

No, the normal hot filling line can be used for both still (non-carbonated) juice only, for carbonated juice drinks, it need isobaric pressure filling machine.

Q10  What food safety standards does your juice line comply with (FDA, CE, ISO 22000, etc.)?

Our juice production line complies with CE (Conformité Européenne) for machinery safety and electromagnetic compatibility, and ISO 22000 for food safety management systems. For hot filling machines specifically, we also follow cGMP (Current Good Manufacturing Practices) and HACCP (Hazard Analysis Critical Control Points) principles to ensure microbiological safety, seal integrity, and thermal processing compliance.