Buyer guide Updated
Which Filling Method for Small-Batch Liquids and Powders?
Every filling machine has to answer one question: how does a measured amount of product get from the hopper into the container? The answer, the dosing method, is chosen around the product, not the container. This guide explains the common methods in plain words, what each is good at, and the questions that decide which one your small-batch line needs. Mactec selects the dosing method for its monoblock fillers and sachet machines around your product and confirms it on your samples.
Liquids: four common methods
- Piston. A cylinder draws in a set volume and pushes it out. Accurate and repeatable; handles thin to thick products and many products with pieces. The usual choice when dose accuracy matters.
- Peristaltic. A rotor squeezes product through a tube; only the tube touches the product. Favoured for small doses, sterile or sensitive liquids and quick changeover (change the tube, not the pump).
- Gravity or time-pressure. Thin, free-flowing liquids flow for a set time under gravity or light pressure. Simple, best for water-like products.
- Pump (gear, lobe, rotary). For thicker products that need to be moved under pressure; the pump type follows the product.
Powders: by volume or by weight
- Auger. A screw turns a set number of times to deliver a set volume. The standard method for powders; accuracy depends on how consistently the powder flows and settles.
- Cup or volumetric. A fixed cavity fills and empties; simple and fast for free-flowing granular products.
- Weigh-filling. Each dose is weighed; the most accurate, and slower and dearer, used when the dose must be exact.
What decides the method
- The product. Thin or thick, with or without pieces, free-flowing or cohesive powder, hot or cold, sensitive to shear or to air.
- The dose and its tolerance. A supplement powder and a measured pharmaceutical dose need different accuracy.
- Changeover. How often you switch products, and how quickly the product-contact parts must be cleaned or swapped.
- Cleaning and product contact. Which parts touch the product, and how they are cleaned or validated: the questions the vial, bottle, cup and tube filling and capping page lists.
- Speed. Output per minute sets how many fill stations or lanes you need.
Where the method lives on a Mactec machine
On the MTMB-24 and MTMB-60 monoblocks the filling station is one of several stations around one rotary platform, configured for liquid or dry products, with the closing station (sealing, cap torquing, tip insertion or tube crimping) matched to the container. On the MTVP160 and MTVP200 sachet machines the dose drops into the pouch from above. In both cases the dosing method is chosen for your product; bring samples, the fill amount and the accuracy you need, and the method is confirmed in the proposal.
Why samples matter
Products rarely dose the way a data sheet suggests. Where practical, Mactec runs your product on a machine in Sayreville, New Jersey, before you commit.
Related buyer guides
- Choosing Monoblock Filling and Capping Equipment
- Liquid Pouch Filling Machines for Sauces, Creams and Liquids
- Powder Sachet Filling Machines: Dosing, Dust and Seal
Discuss your project with Mactec
Request an equipment quote using the form below. You do not need a finished specification. If you are unsure where to begin, contact Mactec and describe the product and the package you have in mind.
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