Liquid Filling Machines: Net Weight, Flow Meter, and Gravity Level Filling for Bottling Lines

Selecting the right liquid filling machine for a bottling line is a decision that directly affects fill accuracy, production throughput, product quality, and the range of containers and formulations the line can handle. Different filling technologies suit different products and production environments — the correct choice depends on the physical properties of the liquid, the required fill accuracy, the container format, and the regulatory requirements of the industry.

Filtec Net Weight Filler

Advanced Packaging Systems (APS) is the New Zealand distributor for Filtec Automation, whose range of rotary and linear liquid filling machines covers the main filling technologies used in food and beverage, cosmetics, pharmaceutical, and industrial production.

Filling Technology: Three Approaches to Liquid Filling

Filtec’s filling range covers three primary filling principles, each suited to a different product and production profile. Understanding the operating principle of each type is the starting point for specifying the correct machine.

Gravity Level Filling

Gravity level fillers are designed for free-flowing, low-viscosity liquids — milk, water, beverages, cordials, vinegars, and similar products. The filling principle is straightforward: containers are lifted on a cam onto open filling nozzles, and the liquid fills to a set height determined by spacer rings fitted to the nozzle. When the liquid reaches the nozzle tip, filling stops automatically. Fill height is adjusted quickly and without tools by adding or removing spacer rings.

The simplicity of the gravity level principle makes it reliable and cost-effective for beverage operations running consistent product in consistent containers. Filtec’s GLF Series gravity level fillers handle a wide range of glass and plastic bottle sizes and are available with integrated rotary rinsing and capping on the same platform.

Filtec GLF Series – Gravity Level Fillers

Net Weight Filling

Net weight fillers deliver precise fills by weight rather than by volume or level. Each container is tared before filling, and the weight of incoming product is monitored continuously during the fill cycle. When the target weight is reached, the filling nozzle closes. This approach eliminates the effect of container weight variation on fill accuracy and is well suited to products where fill accuracy has direct commercial or regulatory implications — premium food products, pharmaceutical liquids, and products sold by declared net weight.

Filtec’s FF Series net weight fillers use two-stage filling — a fast fill phase followed by a slow, accurate top-up phase — to maximise throughput whilst maintaining tight weight tolerances. Nozzle options include single-stage and two-stage configurations. The machine supports fully automated container height adjustment via touchscreen HMI, reducing changeover time when switching between bottle formats. CIP capability is standard, with the product pump also used to maintain fluid velocity through all pipework during cleaning cycles. GMP compliant configurations are available for pharmaceutical and regulated food applications.

Flow Meter Filling

Flow meter fillers measure the actual volume of product dispensed through the nozzle using an inline flow measurement device. Filtec offers three flowmeter options — mass flowmeters, magnetic flowmeters, and turbine flowmeters — selected according to the conductivity, density, and flow characteristics of the product. Mass flowmeters are suited to high-accuracy volumetric filling of products where density may vary. Magnetic flowmeters work with conductive liquids and are common in food and beverage applications. Turbine flowmeters suit clean, low-viscosity liquids where cost-effective volumetric accuracy is the primary requirement.

Flow meter filling is the most versatile of the three technologies and is widely used across food and beverage, cosmetics, and pharmaceutical production for products where volume is the commercial or regulatory fill measure. The FF Series flow meter fillers share the same platform, capping integration, HMI, and CIP architecture as the net weight range.

Rotary vs Linear Configuration

Filtec’s filling range is available in both rotary and linear configurations. Rotary fillers operate in continuous motion, with containers moving through the filling zone on a rotating turret. This suits high-volume production of a consistent product in a consistent container, delivering higher throughput per floor area than equivalent linear machines.

Linear fillers process containers in a straight line, filling one or more containers simultaneously before indexing forward. They suit operations with more frequent product and container changeovers, smaller batch sizes, or products requiring gentler handling. Filtec’s linear range includes flow meter, volumetric, and gear pump configurations for products ranging from thin liquids through to higher-viscosity formulations.

Controls, CIP, and GMP Compliance

All Filtec fillers are controlled via touchscreen HMI. Automated container height adjustment allows changeovers between bottle formats to be completed without manual mechanical adjustment, reducing downtime and operator error. Fill parameters, CIP programmes, and production records are managed from the same interface.

CIP is available across the range, with the product supply pump used to maintain the fluid velocities required for effective cleaning of all internal product contact surfaces. GMP compliant machine configurations are available for pharmaceutical and regulated food applications, with maximised cleanability, smooth internal surfaces, and documentation packages to support validation requirements.

Industries and Applications

Filtec filling equipment is used across food and beverage (milk, water, juices, sauces, dressings, cordials), cosmetics and personal care, pharmaceutical and nutraceutical liquids, and household and industrial chemical products. The range covers applications from small and medium production operations through to high-speed rotary lines producing hundreds of containers per minute.

Liquid Filling Equipment in New Zealand

Advanced Packaging Systems is the authorised New Zealand distributor for Filtec Automation, providing equipment specification support, line integration guidance, spare parts, and local technical service. Contact APS to discuss your liquid filling requirements or to identify the correct filling technology for your product and production environment.