Direct answer: give every supplier the same revision-controlled project basis.
A powder filling machine specification should state the actual product and its variable condition, all target doses, the real container or film, required accepted output, cleaning and safety boundaries, site utilities, upstream and downstream interfaces, samples available and the exact evidence that will be used to accept the equipment.
What product information should be supplied?
- Product name, recipe family and whether the sample is the final production formulation.
- Particle description, fines, lumps, fibres, flakes, oils, abrasiveness, fragility and tendency to segregate.
- Loose and, where relevant, tapped bulk density with the measurement method, sample condition and expected range.
- Flow behaviour: free-flowing, cohesive, bridging, ratholing, flooding, aerating, compacting or static-prone.
- Dust and occupational-exposure information, current safety data and any site COSHH or DSEAR requirements.
- Moisture, temperature, humidity, hygroscopicity and maximum time the product may remain open or in the hopper.
- Food allergens, colours, active materials or incompatible products that affect cleaning and changeover.
- Minimum sample quantity available for tooling selection, trials and acceptance.
What pack and closure information is needed?
| Pack type | Information to provide | Machine decisions affected |
|---|---|---|
| Bottle, jar or tub | Drawing and samples, material, neck opening, height, base, usable volume, tolerances, cap and seal components. | Nozzle, fill height, conveyor guides, sensors, settling, capper and clean rim or thread. |
| Premade pouch or bag | Flat and opened dimensions, gusset, zipper, material, opening stiffness, fill line and closure method. | Pouch support, nozzle, bag clamp, dust control, settling, sealing and transfer. |
| VFFS roll film | Film structure, thickness, width, coefficient behaviour if known, print registration, target bag and seal requirements. | Forming set, film draw, jaw settings, dwell, coding, dose timing and finished-bag discharge. |
| Sachet or small pack | Usable internal volume, opening, target dose, seal margins and any multi-lane or count requirement. | Small-dose tooling, cut-off, measurement method and seal-area control. |
How should dose and quality requirements be stated?
List every minimum, nominal and maximum target, not only the most common SKU. State the required average and individual limits separately, the measuring instrument and resolution, the check frequency, whether the pack is sold by weight, and whether an in-line check or operator feedback is required. Avoid using a catalogue accuracy figure as the acceptance criterion without an agreed product and test condition.
How should output and batch profile be described?
- Accepted finished packs per hour or shift, plus the exact line boundary.
- Normal batch sizes, number of SKUs, changeovers per shift and campaign length.
- Operators available and which manual tasks are acceptable.
- Product refill source, transfer distance, hopper level control and replenishment method.
- Closing, sealing, coding, inspection, labelling and discharge stages included in the target.
- Planned checks, rejects, rework and normal consumable changes.
The output and speed guide provides a common basis for comparing proposals.
What site and integration data should be included?
| Area | Required information |
|---|---|
| Layout | Available footprint and height, access routes, floor, operator positions, maintenance clearances and future equipment. |
| Utilities | Available electrical supply, compressed air, extraction, network or data interfaces and any restrictions on heat or water. |
| Environment | Temperature, humidity, washdown or dry area, food zoning, dust classification and other site controls. |
| Upstream | Product source, feeder, sieve, metal control, empty-pack supply and required buffer. |
| Downstream | Sealer, capper, coder, inspection, reject, labeller, conveyor, accumulation and case packing. |
| Controls | Start/stop ownership, ready/fault signals, emergency-stop interface, recipe control and data or audit requirements. |
What cleaning and safety boundaries must be resolved?
State whether the site uses dry cleaning, vacuuming, wipe-down, wet cleaning or a validated combination. Identify the product-contact boundary, removable parts, cleaning location, line-clearance record and the next-product requirement. Supply the competent COSHH, DSEAR and hazardous-area decisions that affect equipment; the machinery supplier should not guess the zone or protective concept from a product name.
What should be agreed for trial, FAT and acceptance?
- Identify the production-intent product batch and every pack or format to be tested.
- Define targets, tolerances, sample size, statistics and the instrument used for measurement.
- Include start-up, stable running, low hopper, refill, stop, restart and the agreed abnormal line state.
- State finished-pack checks for dust, spillage, headspace, closure, seal, code and presentation.
- Record settings, tooling, change parts, utilities, operator method, adjustments and rejected packs.
- Define what must be demonstrated before shipment and what remains for site acceptance.
Questions buyers ask when preparing a powder filler brief
How much product is needed for a trial?
The quantity depends on hopper and feeder volume, all target doses, the number of test states and whether sustained output or cleaning is included. Ask for a trial plan before shipping product so enough representative material is available without unnecessary waste.
Can a safety data sheet replace a product sample?
No. Safety information is essential for handling and assessment, but it does not prove flow, density, aeration, cut-off, pack filling or cleaning. Supply both current safety information and representative product where a trial is required.
Should the largest and smallest pack be sent?
Yes, where both are in scope. They define tooling, usable volume, fill height, conveyor or pouch support and the practical limits of a changeover.
Who should approve the specification?
Production, engineering, quality, safety and procurement should review the parts relevant to them. Name the person who controls revisions and the person authorised to accept trial and FAT results.