Most packaging machine projects go wrong before the first quotation is even sent — not because the machine was badly built, but because the specification was never clear. This guide walks through the eight decisions that determine whether a packaging line works smoothly or creates problems for the next five years.
1. Start with the product, not the machine
Every specification should begin with four product facts:
- Physical form — powder, granule, liquid, paste, or a solid piece
- Fill weight per bag — and the tolerance your customer accepts
- Product behaviour — dusty, sticky, friable, hygroscopic, or prone to static
- Temperature — whether the product is filled hot, warm, or cold
A 5 g dusting powder and a 500 g frozen dumpling can use the same bag style but need completely different dosing systems. Suppliers who are asked “how much for a packaging machine” without these four facts will either guess or quote the cheapest option — and both outcomes cost you more later.
2. Choose the bag format before the machine type
The bag format is a marketing decision that becomes an engineering constraint. Three families cover most food and household products:
- Pillow bags from roll film — lowest cost per bag, made on vertical form-fill-seal (VFFS) equipment. Best for high volume, simple products, and short shelf-life goods.
- Premade pouches — stand-up, flat-bottom, zipper, spout, and retort formats, run on rotary premade pouch machines. Higher film cost, but far stronger shelf presence and resealability.
- Flow wrap — a sealed fin or fin-plus-crimp wrap for solid items such as bars, biscuits, and hardware, produced on horizontal flow wrap machines.
A fourth family covers small-bag products: dedicated coffee and tea bag packaging machines, which form, fill and seal filter bags with tag and string rather than pouches from roll film.
Decide what the bag must achieve on the shelf — standing upright, re-closing, holding a spout, surviving retort — and the machine type follows almost automatically.
3. Size the speed to your real demand, not your best day
Machine speed is usually quoted in bags per minute, but the number that matters is sustainable output over a shift, including stops, film splices, and changeovers.
- Calculate peak-week demand, not annual demand divided by 250 days.
- Add 20–30 % headroom for growth — but not 300 %, which buys capability you will never recover in cost per bag.
- Ask what speed the machine reaches with your product and your film, not with a free-flowing test granule.
4. Check film and material compatibility early
Sealing is where most commissioning problems appear. Confirm three things before you sign: the sealing jaw type (impulse, constant heat, or ultrasonic), the film structure the machine is set up for (for example PET/AL/PE, PET/PE, or paper-based laminates), and the film roll core diameter and maximum width the machine accepts.
If your market requires recyclable mono-material films, say so at the specification stage. Mono-PE and paper-based structures behave differently on sealing jaws than aluminium laminates, and retrofitting is far more expensive than specifying correctly.
5. Plan utilities, floor space, and the rest of the line
A packaging machine is never the only thing on the floor. Budget for compressed air (pressure and flow, not just “we have air”), power supply and phase, extraction for dust, and the conveyor or weighing equipment feeding the machine. Ask for a dimensioned drawing with the machine’s footprint including the film roll and the discharge conveyor — the drawing that arrives with the quotation is often smaller than the machine in reality.
6. Understand changeover and spare parts before you buy
If you run more than one bag size, changeover time becomes a hidden cost. Ask for the number of parts that must be swapped, whether changeover needs tools, and how long a trained operator takes. Then ask for the recommended spare parts list with part numbers and lead times for the consumables you will actually wear out: sealing jaws, heater cartridges, cutter blades, and vacuum or pneumatic components.
7. Run a sample trial — and send enough product
A machine that runs well in a video may not run well with your powder. A proper trial uses your product, your film, and your target bag size, and it should produce bags you can open, seal-check, and drop-test. Send more product than you think is needed: 5–10 kg allows several runs across different settings, while 500 g rarely gets past the first adjustment.
Ask for a short video of the trial with the settings used. It gives you a baseline for commissioning later, and it shows whether the supplier actually ran the trial or only quoted a catalogue number.
8. What to put in your request for quotation
A clear RFQ shortens the process for everyone and makes quotations comparable. Include:
- Product description, fill weight, and target bag size
- Bag style with a reference photo or artwork
- Required output in bags per minute or bags per shift
- Film structure, or the shelf-life requirement that determines it
- Voltage, frequency, and phase at your site
- Destination country and port
- Any certification or documentation your market requires
- Whether you need a full line (feeding, weighing, metal detection, case packing)
Send those eight points and a supplier can respond with a specification instead of a guess. Leave them out and you will spend the next month comparing prices for machines that are not actually the same.
Summary
Specify the product, the bag, the speed, the film, the utilities, the changeover, and the service terms — then test with a real sample. The machine is the last decision, not the first. If you are at the specification stage and want a second opinion on bag format or machine type, send us your product details and we will tell you which machine category fits.