How the SDH-R Rotary Filling Machine Works
A deep dive into the engineering behind the SDH-R — from rotary indexing mechanics to servo-driven precision filling and Modified Atmosphere Packaging.
The Rotary Filling Process
Five integrated stations work in parallel within the SDH-R\'s compact rotary carousel, processing multiple cups simultaneously.
Rotary Indexing
The heart of the SDH-R is its rotary turntable—a precision-machined carousel that indexes cups through each station in a continuous circular motion. Unlike linear systems that move cups in a straight line, rotary indexing allows multiple operations to occur simultaneously on different cups, dramatically increasing throughput within a minimal footprint.
Servo-Driven Filling
Each filler station uses servo motors controlled by the PLC to deliver exact product volumes with every cycle. Servo drives offer superior accuracy compared to pneumatic systems—typically ±0.5% fill weight consistency—because they use electronic position feedback rather than air pressure, which fluctuates with temperature and supply variations.
Heat Sealing
Roll-stock film is drawn across the cup opening and heat-sealed to create an airtight, tamper-evident closure. The sealing station uses precisely controlled temperature and dwell time to ensure consistent seal integrity across every cup—critical for maintaining product freshness and meeting retail packaging standards.
MAP Nitrogen Flushing
Before sealing, the optional Modified Atmosphere Packaging (MAP) system displaces oxygen inside the cup with food-grade nitrogen, reducing residual oxygen levels to 0.3–0.4%. This dramatically extends shelf life for perishable products like hummus and dips, often doubling or tripling refrigerated shelf life compared to standard sealing.
Lid Application
The final station uses an automated Pick and Place system to apply over-top plastic lids. The snapping device ensures consistent lid alignment and secure closure—providing the consumer-friendly, resealable packaging that retailers demand for grab-and-go dip products.
The Servo-Driven Advantage
Why servo-driven filling machines outperform pneumatic and mechanical alternatives in precision, efficiency, and total cost of ownership.
Fill Weight Accuracy
Servo-driven piston fillers achieve ±0.5% accuracy, minimizing product giveaway and ensuring regulatory compliance with net weight requirements.
Faster Changeovers
Digital recipe storage in the PLC means switching between products takes minutes, not hours. Save fill volumes, speeds, and sequences for instant recall.
Reduced Maintenance
Servo motors have fewer wearing parts than pneumatic cylinders. No air seals to replace, no regulators to calibrate—just precise, repeatable motion.
Programmable Flexibility
Adjust fill speed, volume, and sequence through the touchscreen HMI. Create and store unlimited product recipes without mechanical adjustments.
Energy Efficiency
Servo systems consume power only during motion, unlike compressed air systems that run continuously. Lower operating costs over the machine's lifetime.
Consistent Output
Electronic position feedback maintains fill accuracy regardless of product temperature, viscosity changes, or ambient conditions.
Rotary vs. Inline Filling Machines
Understanding the fundamental differences between rotary and inline filling architectures—and why rotary is the smart choice for compact, mid-scale production.
| Feature | Rotary (SDH-R) | Inline |
|---|---|---|
| Footprint | Compact (44" × 52") | Long (often 10–20 ft) |
| Throughput | Up to 30 CPM | Typically 10–15 CPM |
| Simultaneous Operations | Multiple stations run in parallel | Sequential, one at a time |
| Changeover Time | Minutes (digital recipe recall) | Often 30–60 minutes |
| Floor Space Efficiency | Excellent | Poor for equivalent output |
| Multi-Component Filling | Up to 3 fillers in one footprint | Requires extended line length |
| Best For | SMEs, limited floor space, multi-product | High-volume, single-product lines |
Servo-Driven Volumetric Piston Filling Technology: How ±0.5% Accuracy Is Achieved
Fill accuracy on the SDH-R comes from a servo driven filling machine architecture built around a volumetric piston filler. Volumetric means the machine physically displaces a measured volume of product on every stroke rather than inferring a dose from time, pressure or rotation. Servo-driven means that stroke is executed by a closed-loop servo motor with encoder feedback, so the piston travels to the same position, at the same profile, on every cycle of every shift.
That combination is what holds fill-weight accuracy to ±0.5% across a 50 g to 500 g range. Competing technologies drift for structural reasons:
- Pneumatic piston fillers depend on plant air. Line pressure changes through the day as other equipment cycles, and stroke speed and end position change with it. There is no feedback loop to correct the error.
- Pump fillers (lobe, gear, peristaltic) dose by running for a set time or a set number of revolutions. Any change in viscosity, temperature or slip in the pump changes the delivered volume, so you chase the setting as the product warms up.
- Auger fillers are built for free-flowing powders. On a wet, sticky, particulate-laden dip they bind, shear the product and smear the cup rim.
The servo also controls the shape of the shot, not just its size. Fill velocity is ramped so product enters slowly at first to avoid splashing the flange, accelerates through the body of the fill, then decelerates and reverses into a suck-back so the nozzle breaks cleanly with no stringing or drip. A clean nozzle break is a seal-integrity feature, because product on the flange is the leading cause of seal failure.
Valving is deliberately large bore so whole chickpeas, roasted pepper, olive pieces and herbs pass through without being sheared or bridging at the nozzle. Up to three filler stations can be fitted, so base product, drizzle and garnish are placed in a single pass rather than in separate handling steps. Changing dose is a recipe value on the HMI, not a mechanical adjustment. See the chickpea-specific configuration on the automatic hummus filling machine page.
Rotary Indexing Turret Architecture: Station-by-Station, and Why It Beats Inline
The SDH-R uses rotary filling technology: cups are carried on an indexing turret that presents every cup to every station in turn, and all stations act at the same instant on different cups. While one cup is being filled, another is being flushed, another sealed, another lidded and another discharged. Cycle time is therefore set by the single slowest station, not by the sum of the stations.
A typical station sequence runs as follows:
- Cup denesting. A pneumatic denester separates one cup from the stack and seats it square in the turret pocket. Square seating matters downstream, because a tilted cup gets a lop-sided pour.
- Filling. One to three servo volumetric piston stations deposit base product and, where fitted, drizzle and garnish in the same pass.
- Nitrogen flush (optional). Headspace oxygen is displaced immediately before the seal closes.
- Heat sealing. Roll-film membrane is indexed, sealed and cut, producing a tamper-evident closure.
- Lidding (optional). A pre-cut lid or a snap-on overcap is applied by pick-and-place.
- Discharge. The finished cup is transferred out to your conveyor, date coder or case packer.
Compared with an inline machine, where cups travel a straight track between separate modules, the rotary layout concentrates all of that motion inside one small frame. The SDH-R occupies 44 x 52 in (1,100.5 x 1,315.5 mm) with a height of 65.6 in, so it fits where a two-machine inline arrangement plus transfer conveyor will not. It also means one drive system, one control system and one guarding envelope rather than several, which is why the fill-to-seal interval stays consistent and MAP is practical.
Throughput is up to 30 cups per minute on a dry cycle, with 18 to 25 CPM typical in real production once product viscosity, fill weight and seal dwell are taken into account. That range covers most craft and mid-size retail dip programs on a single shift. Full specifications, cup sizes and options are on the SDH-R rotary cup filling machine page.
Sealing & Lidding Technology: Tamper-Evident Membrane, Pre-Cut and Snap-On Lids
The sealing head is where the package becomes retail-legal, and the SDH-R treats it as a controlled process rather than a fixed setting. Tamper evident sealing technology on the machine is roll-film membrane heat sealing as standard: film is indexed over the filled cup, a heated die bonds the sealant layer to the cup flange, and the membrane is cut in the same motion. Lifting that membrane tears the film or strips a witness ring of sealant from the flange, which is precisely what makes the closure tamper-evident and what retail category listings require on wet refrigerated foods.
Three closure formats are available on the same frame:
- Roll-film membrane seal — standard, lowest cost per unit, ideal for steady retail SKUs.
- Pre-cut foil or film lid — optional, magazine-fed, adds barrier and heavier print for premium or short-run products.
- Snap-on lid — optional pick-and-place overcap applied over the membrane for reclose and stacking strength.
Seal temperature, pressure and dwell are each controlled independently, which is the difference between a machine that can seal one film and a machine that can seal your whole portfolio. A thicker foil laminate needs more dwell than a thin PP membrane; a cold-filled product pulls heat out of the flange and needs a different setting again; a square cup distributes pressure differently from a round one. Each combination is stored as a recipe in the PLC and recalled at changeover, so operators are not re-discovering the seal window by trial and error every Monday morning.
Film selection still belongs to you. The heat-seal layer must be chemically compatible with the cup resin, and the barrier of the structure — its oxygen transmission rate — determines whether a modified atmosphere is held or slowly lost. We validate the seal window against your actual cup and film before shipment. For the full dip and spread configuration, including sealing options and cup formats, see the automatic dip filling and sealing machine overview.
MAP Nitrogen Flushing Technology: Turning 7-10 Days into 30-45+ Days of Shelf Life
Optional MAP nitrogen flushing is the single feature that most changes what a dip business can sell. Modified atmosphere packaging works by displacing the oxygen in the cup headspace with food-grade nitrogen in the moment before the sealing die closes. Oxygen is what drives aerobic spoilage, oxidative rancidity in tahini and oils, and the surface browning and separation that make a fresh dip look old. Remove most of it and the clock slows dramatically.
On the SDH-R, refrigerated shelf life moves from roughly 7 to 10 days unflushed to 30 to 45 days and beyond with nitrogen flushing, on the same product and the same recipe. The commercial consequences are worth spelling out:
- Distribution radius. A 30 to 45 day life supports DCs, national accounts and cross-country freight rather than local direct delivery only.
- Retailer acceptance. Most chains want a minimum remaining life at receiving, and short-life product is often refused before it is ever listed.
- Shrink and returns. Longer life means fewer markdowns and fewer credits, which usually shows up on the P&L faster than the throughput gain does.
- Production planning. Longer runs, fewer changeovers, and less pressure to produce to next-day demand.
Two conditions have to hold for any of it to work. First, the flush has to happen inside the same machine as the seal — the reason an integrated filler-sealer beats a separate filler and a standalone sealer is that a cup carried between two machines has already lost its atmosphere. Second, the package has to hold the gas: a hermetic seal with no channel leaks, and a lidding film and cup with an oxygen barrier appropriate to the target shelf life. A high-barrier lid on a low-barrier cup is still a leaky package. Our detailed explainer covers the mechanism and the numbers in MAP nitrogen flushing and dip shelf life.
Hygienic Design, CIP, PLC Recipe Control and Food-Grade 304 Stainless Construction
Everything above only matters if the machine survives daily washdown and a food safety audit. The SDH-R is built as a food grade 304 stainless filling machine: product-contact surfaces and frame are 304 stainless steel, with a layout designed for drainage and access rather than for hiding fasteners behind panels.
It is a CIP filling machine with clean-in-place circuits and easy-access connectors, so the product path can be flushed and sanitised without breaking the line down. Where a strip-down is required — allergen changeovers, end-of-week deep clean, film path service — the machine is designed for tool-free strip-down, which keeps sanitation on schedule and out of the maintenance department's queue.
Control is by PLC controlled filling machine architecture with an operator HMI:
- Recipe storage. Fill weight, index timing, seal temperature, pressure and dwell are stored per SKU and recalled at changeover. Product changeover runs in under about 15 minutes.
- Diagnostic alerts. Faults are reported at the HMI with the station and condition identified, so operators fix causes rather than hunting for them.
- Repeatability across shifts. The settings that produced Monday's validated seal are the same settings on Friday night, regardless of who is running the machine.
- Fewer wearing parts. A servo drive train replaces the cylinders, valves and air lines of a pneumatic machine, which removes a large share of routine maintenance and the drift that comes with it.
The machine is CE, FDA and UL certified, designed and built in Calgary, Alberta, Canada by Alter Pack, and covered by a 12-month warranty with service centres in Alberta, New Jersey and California — so parts and support are on the same continent as your plant. Machines start from $45,000 USD with typical delivery in 8 to 12 weeks. To size a configuration against your cups, film and product, request a cup filling and sealing machine quote and our engineering team will specify it with you.
Rotary vs Inline Cup Filling & Sealing
Why a rotary indexing turret suits mid-scale cup filling, sealing and cupping production.
| Factor | Inline filler-sealer | Rotary filler-sealer (SDH-R) |
|---|---|---|
| Layout | Stations spread along a straight line | Stations arranged around an indexing dial |
| Footprint | Grows with every station added | Compact - 44 x 52 in |
| Adding a station | Extends overall machine length | Another position on the existing dial |
| Cycle time | Governed by transfer between stations | Governed by the slowest single station |
| Multi-component filling | Requires added length | Up to 3 fillers on the same dial |
| Typical sweet spot | Very high speed, large plants | 18-30 CPM mid-scale production |
See the Technology in Action
Schedule a virtual demo or visit our facility in Calgary, Alberta. We'll walk you through every station of the SDH-R.