FAQ · Edible Oil
Edible Oil Filling — Frequently Asked Questions
Selection, technical, installation, certification and commercial questions, answered with parameters for oil lines.
5–30
t/h load cell range
1–20
L container range
444+
Lines delivered
71+
Countries exported
9+
Countries with service
Short answer: Edible oil is filled by weight, not level, because it is sold and declared by weight. Load cell valves weigh each bottle and close at target net weight, the correct choice because a percentage error is a large absolute quantity in a 5–15 L container. Oil is filled warm to lower viscosity; PET runs on a combiblock, jerry cans and drums on separate fillers. This page answers the questions buyers ask most, grouped by subject.
🎯 Key takeaways
- Oil is filled by weight (load cell), not level
- Warm filling lowers viscosity; stable temperature holds weight
- Combiblock for PET; separate filler for jerry can and drum
- Load cell is the most accurate principle for weight-declared oil
- Scope-normalise quotations — temp control, CIP and load cell are common exclusions
- Ask three questions in writing: sustained output on your container, exclusions, changeover time
On this page
1. Selection questions
The questions buyers ask before a specification exists. The full selection logic is in the edible oil selection guide.
What output should I size an oil line for?
On the volume you can sell within roughly two years, not the market you hope to hold in ten. A regional PET bottler is usually served by 6,000–18,000 BPH. Idle capacity still carries installed power, footprint and a larger spare part inventory. Plan the building for a second line rather than over-sizing the first.
Can one machine run PET, jerry can and drum?
Not one machine. PET runs on a combiblock; jerry can and drum run on separate fillers, because they are not blown from preforms. A plant selling all three runs separate machines at very different speeds. State the full container range at quotation so the line is specified for it.
Do I need a combiblock for edible oil?
Only for PET. A blow-fill-cap block blows PET from a preform and only applies to PET, with load cell filling on the bottle. Jerry cans and drums are filled on separate machines. See the selection guide for why the block applies to PET and not to bulk containers.
What information does a supplier need to quote?
- Target output at a named container size and fill weight
- Every container and closure you intend to run, including later ones
- Oil grade and fill temperature
- Declaration: by weight or by volume, and the tolerance
- Site conditions: power, heating, water for CIP, building dimensions and door openings
- Scope items: temperature control, CIP, load cell and test weights, labeller, packer
2. Technical questions
Which filling principle is most accurate for oil?
Load cell weighing, because it measures net weight directly and compensates for empty-bottle weight variation and density shift with temperature. Volumetric is next, adequate where volume declaration is allowed and the oil is thin. Gravity level filling is rarely right for oil because it does not guarantee the declared weight.
Why does temperature control matter?
Because oil viscosity and density both move with temperature. Stable warm oil fills fast and clean; variable temperature lets the delivered weight drift even on a weight-dosed line, because the load cell weighs mass while the customer judges the product by volume. Hold the fill temperature and the line holds both speed and weight.
How is the line cleaned?
Through a CIP circuit suited to greasy product: a hot caustic wash, rinse and sanitisation on the product path. Oil is harder on seals than water, so CIP and seal specification matter more than on a water line. Specify CIP with the line rather than adding it later.
What causes weight variation?
| Symptom | Most common cause | Check first |
|---|---|---|
| Drift across a shift | Temperature or density shift | Fill temperature control |
| Scatter bottle to bottle | Bottle weight variation | Preform and bottle consistency |
| One valve different | Worn seat or blocked path | That valve's service history |
| Step after changeover | Format or zero setting | Changeover checklist and zero |
| Slow drift over months | Load cell calibration drift | Calibration log and interval |
3. Installation and commissioning questions
What does the building need?
- Level floor with load capacity and any foundation work done
- Power at correct voltage and frequency, stable to the machine
- Heating for the product and CIP, and water for CIP at required quality and flow
- Drainage, ventilation and lighting in the production area
- Access route for machine sections, including door widths and lift capacity
How long does commissioning take?
In phases: mechanical installation, utility connection, water running, product running and speed ramp, then training. Oil commissions without the foaming behaviour of carbonated product or the temperature stability step of hot-fill, so it is relatively straightforward — delays are usually site readiness, not the machine.
What is checked at the factory acceptance test?
Mechanical operation, controls, safety interlocks, output at rated speed and fill weight on your own bottles and oil. Send real bottles and real oil in production quantity; testing on generic items then finding yours differ defeats the purpose. Agree the acceptance criteria in writing first.
4. Certification and compliance questions
What certification does Sunswell hold?
ISO 9001 and CE certification, with SGS audit. Equipment is built in a 20,000 m² facility and 444+ lines have been delivered to 71+ countries. These are company and equipment credentials; market-entry approval for your destination is a separate process with your importer.
Who handles destination-market certification?
Handled with your importer, because the scheme depends on the destination and on who is the responsible importer. Sunswell supplies the technical documentation, drawings and declarations. Start it early — certification runs in parallel with manufacturing.
What food-contact documentation is available?
Material specifications for product-contact parts, including stainless steel grades and elastomer types suitable for oil, supplied with the machine documentation. State the destination market at quotation if a specific food-contact standard applies, because it can change the gasket specification.
5. Commercial questions
How much does an edible oil filling line cost?
Price scales with output, valve family, container family and automation, then with contact-part material and downstream scope. Figures without a defined scope mislead. Send the container range, grade and target output and request a written quotation against a stated scope. Tiers are compared in edible oil machine configurations compared.
What is usually missing from a cheap quotation?
Temperature control, CIP for greasy product, load cell and test weights, format parts for other containers, installation, commissioning, training and a commissioning spare part set. Build one scope list, send it to every supplier and require line-by-line answers including exclusions.
What are the main running costs?
Electricity for heating and the line first, then water and caustic for CIP, labour, consumables such as caps and labels, and spare and wear parts. Giveaway — overfill to stay above the declared weight — is the largest hidden recurring cost and the main reason to specify load cell filling.
What after-sales support is available?
Sunswell runs local service in 9+ countries and supports installations across 71+ export markets with remote diagnostics, spare parts and engineer visits. Agree response expectations and the spare part list in the contract rather than after the first breakdown.
Three questions that prevent most disputes. Ask every supplier, in writing: what is the sustained output on my container; what is excluded from this quotation; and what is the changeover time between my two most common containers. Those three separate comparable quotations from ones that only look comparable.
6. Related resources
Longer treatments of the subjects above:
- Edible oil filling machine selection guide — output, container and valve by declaration
- Edible oil machine configurations compared — economy, mainstream and high-speed tiers with TCO
- Combiblock for edible oil — load cell block on PET
- Edible oil filling machines — the full range
- Filling valve types compared — load cell, volumetric and piston
For complete lines, see the edible oil production line solution.
Frequently asked questions
Is edible oil filled by volume or by weight?
By weight for weight-declared oil. A load cell valve weighs each bottle and closes at target net weight, which is the correct choice because a percentage error on oil is a large absolute quantity, especially in a 5–15 L container. Volume dosing is used only where the market allows a volume declaration.
Why is oil filled warm?
Warm oil is less viscous and fills faster with less entrained air. The product is held or heated to a controlled temperature before the filler — not to a sterilising temperature, just warm enough to flow. The exact figure depends on the grade, so confirm it at quotation.
Can a combiblock fill edible oil?
Yes, for PET bottles. A blow-fill-cap block for edible oil uses load cell filling on PET from 1 to 5 L or more. Larger jerry cans and drums run on separate fillers because they are not blown from preforms, so the block does not apply to them.
How accurate is load cell filling for oil?
It is the most accurate principle available, measuring net weight directly and compensating for empty-bottle weight variation and density shift with temperature. Accuracy matters more for oil than for water because oil is higher value per litre and sold by weight.
Does oil foam during filling?
Less than carbonated or hot-fill product, but aeration still matters for quality and headspace. Oil is filled bottom-up or through a diving fill tube to keep the stream below the surface, which limits entrained air. Foam at the neck signals too fast a fill or a wrong tube.
What container sizes are typical?
PET bottles 1–5 L for retail, jerry cans 5–20 L for foodservice and distribution, and drums for bulk. The filler is specified for the size range you will run; PET and jerry can are different machine families, so state both if you sell both.
What spare parts should be held for an oil line?
Seals and gaskets for the valves, a commissioning set of wear items, and for load cell lines a spare cell and test weights. Oil is greasy, so CIP parts and seal kits see more wear than on a water line. Identify long-lead items at handover.
Is training included with an oil line?
Operator and maintenance training is delivered during commissioning and should be written into the contract with defined duration and scope. It covers running, cleaning, calibration and first-line fault diagnosis, in the languages your team uses.
About the author
Written by the Sunswell engineering team — led by Howie SUN, Founder & CEO, with 14 years in filling and blow-moulding equipment R&D and turnkey project delivery across 71+ countries.
Last reviewed: 2026-08-10 · Reviewed by Sunswell engineering team
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