Material features: Flows rapidly under gravity with negligible internal resistance
Recommended filling system: Gravity filling system. Featuring a simple structure and low operational cost, it is perfectly suited for mass production of thin liquids.
Medium-viscosity Liquids
Typical materials: Honey, condensed milk, salad dressing, fruit syrup, shampoo, body wash
Material features: Slow-flowing, unable to flow freely relying on gravity alone
Recommended filling system: Standard rotor-pump filling system, which delivers stable and accurate metering for medium-thick liquids.
High-viscosity Thick Liquids & Pastes
Typical materials: Thick fruit puree, concentrated sauce, glycerin, high-viscosity detergent
Material features: High consistency with barely any gravity flow
Recommended filling system: Enhanced rotor-pump system equipped with a feeding agitator. It effectively prevents material sedimentation and ensures consistent filling volume accuracy.
2. Key Material Factors Affecting Machine Selection
Foaming Characteristics
Foam-prone liquids such as fruit juice and detergent often lead to inaccurate filling volumes. For foaming materials, select machines fitted with anti-foam filling nozzles and bottom-up filling functions to minimize bubble generation.
Solids-containing Liquids
Liquids mixed with fine solid particles (e.g., chili sauce with chili bits, pulpy fruit sauce) easily clog standard nozzles. Large-caliber filling nozzles and anti-clog pump structures are required for stable operation.
Corrosive Properties
Chemical liquids and strong acid/alkaline cleaning agents are incompatible with standard 304 stainless steel. All material-contact components require specialized anti-corrosion treatment.
3. Core Packaging Parameters for Confirmation
Filling Volume Range
Define your actual filling specifications: 5–100ml for small sachets, 100–1000ml for medium pouches, and 1L–5L for large bags. Each machine has a fixed applicable volume range; no single device can cover an excessively wide volume span while maintaining precision.
Bag Type & Packaging Film
Common compatible formats include 3-side seal and back-seal sachets. Stand-up pouches require customized mechanical structures. Verify the heat-seal performance of your packaging film before equipment ordering.
Production Speed Requirements
Actual output is restricted by liquid viscosity, filling volume and bag size. Do not rely solely on theoretical speed parameters from product brochures. Consult suppliers for real production data matched to your materials.
4. Common Purchasing Mistakes to Avoid
Selecting filling equipment merely based on price, while ignoring liquid characteristics such as viscosity, foaming tendency and solid content. This will cause frequent clogging and unstable filling performance on site.
Pursuing an ultra-wide filling volume range on a single machine, which compromises filling precision at both minimum and maximum volume limits.
Conclusion
When selecting liquid packaging machines, liquid properties including viscosity, foaming tendency, solid particle content and corrosiveness take top priority — even more critical than production speed and bag dimensions. Always analyze your liquid characteristics first, then match with a targeted filling system.
Contact our engineering team for free professional material evaluation and customized liquid packaging solutions tailored to your factory production needs.
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