FAQ-Zhangjiagang Grandee Machinery Co., Ltd.

Isobaric filling is a pressure‑balanced filling method used for carbonated beverages. In this process, the container is pressurized with carbon dioxide to the same partial pressure as the product before the liquid is introduced. This maintains the equilibrium of dissolved CO₂, thereby preventing degassing and foam generation during filling. The technique is essential because it guarantees: (1) accurate fill volumes, (2) consistent dissolved CO₂ content (e.g., 3.5–4.5 g/L or 7.5g/L - 8.0g/L), and (3) minimal oxygen pickup, which extends shelf life and preserves sensory quality.

This filling machine is compatible with all the products you mentioned, provided they are carbonated and within the machine’s pressure rating (typically 3–5 bar). For cola, sparkling water, and energy drinks, the standard isobaric filling sequence works effectively. For beer, additional measures are recommended to minimize oxygen pickup and control foam, such as using a CO₂ pre‑purge and a gentle pressure‑release profile. Please confirm your target dissolved CO₂ levels and packaging format, and we will confirm full compatibility.

The CO₂ loss rate is generally controlled within 1.5% – 3% of the total dissolved CO₂ content, depending on factors such as pre‑purging efficiency, back‑pressure stability, and the snift (decompression) profile. Our machine uses precision filling valves and a closed‑loop pressure control system to minimize losses. For example, at a fill temperature of 4°C and a CO₂ volume of 4.0 g/L, the measured loss is consistently below 2.2% in our factory tests. We can run a trial with your product to confirm the exact figure.

Our CSD filling machine covers a broad spectrum of speeds to meet both small‑batch craft production and high‑volume industrial demands. The key speed tiers are:
· Low‑speed lines: 2,000 – 6,000 BPH.
· Medium‑speed lines: 10,000 – 15,000 BPH
· High‑speed lines: 20,000 – 24,000 BPH
·Ultrahigh‑speed lines: up to 36000-48,000 BPH (with servo‑driven filling valves and synchronous capping for consistent performance.

The equipment is applicable to glass bottles, PET bottles, All two compatible container types can be processed, provided the following critical specifications are met:
Parameter PET Bottle Glass Bottle Neck finish Standard threaded plastic closure (e.g., PCO 1810) Crown cap or aluminum screw cap Threaded aluminum closure
Bottle diameter Φ50–115mm Φ50–115mm Φ50–115mm
Bottle height 150–320mm 160–320mm 150–320mm

·CO₂ inlet pressure: 0.28–0.35 MPa
· Compressed air / pneumatic supply: 0.5–0.7 MPa（some models require 0.6–0.8 MPa）
· Rinsing water pressure: 0.2–0.25 MPa
· Isobaric filling tank working pressure: typically 2–4 bar (0.2–0.4 MPa)

Our standard filling machine does not include an integrated carbonation unit. It is designed to receive pre-carbonated beverage from an upstream carbonation system (e.g., a carbonation tank, inline carbonator, or premix preparation vessel).
For most beverage producers, we recommend a separate carbonation unit for better flexibility, easier maintenance, and independent CIP cleaning.

Our isobaric filling system is designed with adjustable pressure control, enabling it to accommodate a wide range of carbonation levels.
1. Carbonation range supported
· Standard configuration: 2.0 – 4.5 volumes of CO₂ (low carbon ≈ 2.0–2.5; high carbon ≈ 3.5–4.5).
2. Adjustment method
· The filling pressure (counter‑pressure) is regulated via the PLC and pressure reducer; higher carbonation requires higher backup pressure to prevent foaming.
· The filling speed and de-pressurization time can be fine‑tuned through the HMI.
· No change parts are required for switching between carbonation levels—only parameter adjustments.

1. Container Type & Size
· Will you be filling PET bottles, glass bottles?
· What is the bottle volume (e.g., 330ml, 500ml, 1L, 2L)?
2. Production Line Scope
· Are you looking for a standalone filling machine (3-in-1 washer/filler/capper), or a complete production line including water treatment, syrup mixing, carbonation, labeling, and packaging?
3. Additional Specifications
· Carbonation level (CO₂ volume): e.g., 2.5–4.0 volumes
· Filling temperature: typically 2–6°C for CSD
4. Destination & Logistics
· Shipping port and country (for export packaging and freight cost calculation)
Budget Reference (for orientation only): For a 6000 BPH CSD filling machine, market prices typically range from $28,000 to $45,000 USD for a standard 3-in-1 PET bottle filler, while glass bottle configurations or complete production lines can range higher. These figures are for reference only—your final quotation will be customized based on the above parameters.

1. Standard Temperature Range
For carbonated soft drink (CSD) filling, the recommended product temperature is typically 2°C to 6°C (with 4°C being the most common target). This range is critical for the following reasons:
· CO₂ solubility – Lower temperature significantly increases CO₂ solubility, allowing higher carbonation levels without excessive foaming.
· Foam control – Cold liquid reduces foaming during the filling process, ensuring accurate fill volume and minimizing product loss.
· Sealing integrity – Proper temperature helps maintain container stability and seal quality after capping.