When the requirement is to control the actual weight of oil going into each container, a weighmetric filling machine offers a different approach from conventional volume-based filling.
Instead of relying only on a preset volume, the container is placed on a weighing system and the filling process is stopped when the programmed target weight is reached.
Eva Pack Pharma manufactures automatic weighmetric oil filling machines for edible oils, lubricants and other compatible liquid products where filling by weight is preferred.
How Weighmetric Filling Works
The basic principle is straightforward.
An empty container is positioned on a load-cell-based weighing platform and its tare weight is established. Oil is then dispensed into the container while the weighing system continuously monitors the increase in weight.
As the target value is approached, the filling flow is reduced or stopped according to the machine configuration. The filled container is then released and the next container enters the filling station.
Container → Tare → Filling → Weight Measurement → Target Reached → Discharge
This makes the weighing system the primary reference for the filling operation.
Why Fill Oil by Weight?
Weight-based filling can be useful when the customer’s production process is based on a defined product mass rather than only a nominal volume.
It is particularly relevant where product density or operating conditions can cause volume and weight to behave differently.
A weighmetric system can also be attractive for manufacturers who want the filling quantity to be directly monitored during every filling cycle.
The decision between volumetric and weighmetric filling should therefore be based on the product, packaging specification and measurement requirement.
Machine Capabilities
Depending on the application, the machine can be configured with:
- Load-cell-based weighing
- Automatic bottle/container positioning
- Programmable target weight
- Tare-weight handling
- Fast and slow filling stages for controlled cutoff
- PLC-based control
- Touchscreen HMI
- Recipe or parameter storage for different products
- Multiple filling heads for higher output
- No-container-no-fill operation
- Automatic discharge after filling
- Integration with capping, sealing, labeling and coding equipment
The actual configuration is selected according to the required weight range, container, product and production rate.
Practical Specifications
| Requirement | Weighmetric Configuration |
|---|---|
| Filling principle | Weight-based / gravimetric filling |
| Measurement | Load-cell weighing |
| Product | Compatible edible oils, lubricants and other suitable liquids |
| Target quantity | Programmable according to application |
| Filling stages | Coarse and fine filling where required |
| Container handling | Automatic positioning |
| Control | PLC with touchscreen HMI |
| Tare function | Configured according to filling arrangement |
| Filling heads | Selected according to required output |
| Multiple products | Recipe/parameter management where required |
| Container sizes | Based on weighing-platform and machine configuration |
| No-container-no-fill | Available |
| Downstream equipment | Capper, sealer, labeler and batch coder |
| Automation | Standalone filler or integrated automatic line |
The final specification should be established from the target weight, container dimensions, product characteristics and required production output.
Where This Type of Filler Makes Sense
A weighmetric filler can be considered when the filling specification is expressed primarily in grams or kilograms, or where the manufacturer wants the filling process to be directly controlled by measured weight.
Typical applications may include:
- Edible oils
- Cooking oils
- Lubricating oils
- Industrial oils
- Other compatible liquid products
For edible oils supplied in retail bottles, volumetric filling may be perfectly suitable in many applications. Weighmetric filling becomes more relevant when weight-based control is itself an important production requirement.
Accuracy Depends on More Than the Load Cell
A good weighing system alone does not guarantee good filling performance.
Container movement, vibration, filling flow, nozzle position and the transition from fast to slow filling can all influence the final result.
For this reason, the weighing mechanism, filling valve and control sequence need to work together.
This is where the machine configuration becomes application-specific. The target weight, product flow characteristics and required production speed determine how the filling cycle should be arranged.
From Weighmetric Filler to Complete Line
The filling machine can operate independently or be connected with other packaging equipment.
For a fully automatic bottle line:
Bottle Infeed → Weighmetric Filling → Capping → Sealing → Labeling → Batch Coding
The number of filling stations and downstream machines can be selected according to the required finished-bottle output.
Weighmetric or Volumetric Oil Filling?
The choice is best made from the measurement requirement.
| Choose based on… | Weighmetric filling | Volumetric filling |
|---|---|---|
| Primary reference | Weight | Volume |
| Measurement method | Load cell | Volume-based dosing |
| Suitable when | Product quantity is specified by weight | Product quantity is specified by volume |
| Main consideration | Stable weighing and filling cutoff | Consistent volumetric dosing |
| Best configuration | Depends on product and production requirement | Depends on product and production requirement |
Neither principle should be selected purely on the basis of machine type. The product specification and customer’s filling standard should determine the approach.
Eva Pack Pharma
Eva Pack Pharma manufactures automatic weighmetric oil filling machines for applications where filling quantity needs to be controlled by weight.
To configure the machine correctly, send us the product, target weight, container size, number of filling stations required and desired production output.
Our engineers can then determine the suitable weighing, filling and automation arrangement for your application.
Discuss your weighmetric oil filling requirement with Eva Pack Pharma.