Most buyers know the basic difference between an inline bottle filler and a rotary bottle filler. Inline fillers fill bottles in a straight row. Rotary fillers fill bottles while they travel around a turning carousel. But knowing how each machine actually moves a bottle from empty to full makes it much easier to read a spec sheet, ask the right questions, and judge whether a used filler fits your line.
Used Packaging Equipment has sold used bottling and packaging machinery exclusively since 1988, including inline and rotary fillers for beverage, food, personal care, household, and chemical producers. This guide walks through how each type of filler works and what each major part does.
An inline bottle filler fills a group of bottles at the same time while they sit in a straight line on a conveyor. The process repeats in cycles.
Empty bottles travel down the conveyor into the filler. A set number of bottles, matching the number of fill nozzles, moves into position beneath the nozzles.
Bottle stops or gates hold the group in place. An entry gate stops the next bottles in line, while an exit gate keeps the filled group from moving forward too soon. Some fillers also use neck guides or side grippers to keep each bottle centered under its nozzle.
The nozzle bar lowers so each nozzle enters or sits over a bottle neck. Product flows into all of the bottles at once. Depending on the filler type, the fill is controlled by liquid level, time, piston stroke, flow meter, or weight.
When filling is complete, the nozzles lift, the exit gate opens, and the filled bottles move downstream toward the capper. The next group indexes into place, and the cycle starts again.
The nozzle bar holds all of the fill nozzles and moves them up and down together. The number of nozzles is often called the number of heads.
Inline fillers draw product from a holding tank, a supply hopper, or directly from a process line. Gravity fillers use a tank above the nozzles. Pump and piston fillers move product under pressure.
Pneumatic gates, bottle stops, or a timing screw control when bottles enter and leave the fill zone. This system sets the rhythm of the whole machine.
Most inline fillers use a PLC and operator interface to set fill times, nozzle dive, indexing, and recipe settings for each product and container.
A rotary bottle filler fills bottles continuously while they travel around a rotating carousel. Bottles never stop moving.
Bottles travel to the filler on a conveyor and are spaced by an infeed timing screw. An infeed starwheel picks up each bottle and transfers it onto the carousel.
The carousel has a ring of fill valves, one above each bottle position. As the carousel turns, each bottle is lifted to its valve or the valve lowers onto the bottle, depending on the design.
Product flows into each bottle as it travels around the carousel. Filling begins shortly after the bottle enters and finishes before it reaches the discharge point. The full rotation gives each bottle time to fill completely.
Filled bottles lower away from their valves and transfer to a discharge starwheel, which sends them onto the conveyor or directly into a capper. On monoblock systems, the discharge starwheel passes bottles straight to the capping turret.
Many rotary fillers have a ring-shaped bowl or tank mounted at the top of the carousel. It turns with the carousel and supplies product to every valve. Some designs use a central manifold instead.
The fill valves control how product enters each bottle. Gravity valves, counter-pressure valves for carbonated products, vacuum valves, and electronic flow meter valves are all found on rotary fillers. The number of valves is a key part of the machine’s description.
On many rotary fillers, each bottle sits on a lift plate that raises it to the valve and lowers it after filling. Others hold the bottle by the neck ring and lower the valve onto it.
The timing screw spaces bottles before they reach the filler. Starwheels transfer bottles onto and off the carousel. These parts are usually sized to specific containers.
A central drive turns the carousel, starwheels, and timing screw together so every part stays in step.
Both inline and rotary fillers can use several fill methods:
Product flows from a tank above the bottles into each container by gravity. It is common for water, thin juices, and other free-flowing liquids.
Overflow nozzles fill each bottle to the same visible level, returning excess product to the supply tank. This is common for clear bottles on retail shelves.
A piston draws a measured volume of product and pushes it into the bottle. It is used for thicker products such as sauces, lotions, and gels.
The bottle is pressurized before filling so carbonated products like beer and soft drinks hold their carbonation. This method is most often found on rotary fillers.
Electronic meters or load cells measure each fill. These methods are used where fill accuracy needs close control.
Terms like heads, valves, nozzle dive, lift plates, and starwheels describe how the machine works. Understanding them makes it easier to compare used listings.
On inline fillers, nozzle spacing, bottle stops, and guides depend on your bottles. On rotary fillers, starwheels, timing screws, and lift plates or neck grippers do. Ask which change parts come with the machine.
Ask whether the filler has been function tested or tested under power. On an inline filler, watching a full index cycle is useful. On a rotary filler, watching the carousel turn and bottles transfer through the starwheels is useful. Verify rates, head counts, and valve types against the specific machine’s specifications.
Used Packaging Equipment has specialized exclusively in used bottling and packaging machinery since 1988. Our inventory includes inline fillers, rotary fillers, monoblock filling systems, and complete bottling lines for beverage, food, dairy, personal care, household, and chemical producers. Financing is available to help you add a filler or expand your line without straining your budget.
Contact our team with your product and container details, and we will help you find a used bottle filler that fits your line.
© 2024 Used Packaging Equipment, LLC. All Rights Reserved.
Website Design & Development by Gibson Design, Fate, Texas
