Two quotes sit on a takeaway-packaging buyer’s desk. One quotes strokes per minute, the other cycles per minute. Neither translates into containers per shift without doing the cavity math first.
When evaluating equipment options at this CAPEX scale, total operational output against your dominant food vertical decides far more than unit price does. The choice resolves on two axes: the reheating method your end customer uses, and cavity-adjusted throughput at comparable tooling spend.
The reheating method an end customer uses — convection oven, microwave, or broiler — maps directly to whether your line should run aluminum foil or CPET. Aluminum tolerates up to 400 °C and conducts heat at roughly 205 W/m·K. CPET tops out at 220 °C with about 94% dimensional stability after 30-minute exposure to 200 °C per ASTM F2264, and conducts at roughly 0.2 W/m·K — a thousandfold gap that decides the vertical fit.
Convection-reheat workflows cluster in the 180–220 °C band: airline trays at 180–200 °C, off-site catering hot-delivery boxes at 200–220 °C, bakery re-bake cycles at 190–210 °C. Aluminum sits 50 °C below its limit through all of these; CPET sits at its ceiling.
Direct-broiler exposure is where CPET starts to fail outright. Vendor stress testing reports a 22% structural-integrity drop — acceptable for chilled retail, disqualifying for catering reheating that includes broiler contact. For the convection-reheat vertical, aluminum foil container machine production capacity is worth modeling against your target SKU mix before sizing the line.
CPET wins where the household microwave is the dominant reheating appliance. The polymer’s 85% crystallinity distributes microwave energy evenly, and aluminum sparks. Supermarket ready-meals, frozen consumer entrées, and any retail SKU the end customer heats at home all belong on a CPET line.
In US frozen-food packaging, trays are the fastest-growing rigid format, the legitimate territory for the CPET thermoformer. Microwave- or oven-ready formats made up 62% of 2024’s new frozen launches, up from 48% two years earlier (Mordor Intelligence). Market demand splits cleanly along the convection-versus-microwave line.
Cavity count and cycle time decide hourly output more than headline stroke rate — whether for a roll-fed thermoforming packaging machine, a sheet-fed press forming CPET trays, or an aluminum foil press. A 4-cavity aluminum press at 70 SPM produces roughly 280 containers per minute.
A 6-cavity tray-class CPET tool at about 7 cycles per minute produces around 42 trays per minute. The gap is roughly 7×, not the 2–5× a reader infers from raw stroke-rate-versus-cycle-rate comparisons.
The capacity formula buyers run against any thermoformer quote is simple: cavities × (3,600 ÷ cycle-time-seconds) = containers per hour. Tray-class tools run slower than cup tools on deeper draw — realistic tray cycles sit at 5–10 per minute, not the cup-class 15–30.
CPET cycle time runs through four phases — heating, forming, cooling, cutting — so its throughput carries more variance than aluminum’s single-phase stamping. The right aluminum foil container machine depends on which cavity-count and SPM combination matches your SKU mix.
Apply the OEE haircut and the gap holds: at 70–85% of theoretical, aluminum’s 280/min settles to 200–240/min and tray-class CPET’s 42/min to 30–36/min. Both lines clear typical takeaway daily volumes on one shift; the real spend is tooling and floor space.
A thermoforming packaging machine and the sheet-fed CPET tray press this article compares are different equipment classes. Roll-fed thermoform-fill-seal (TFFS) machines — the Multivac and ULMA class — pull thin-gauge rollstock under 0.060 inch and run one continuous inline operation: heat, form, fill, seal, and trim in a single index.
A sheet-fed CPET press or aluminum foil press works the other way: it shuttles heavier gauge or stamps coil, outputting empty containers filled downstream.
The forming physics diverge. A TFFS line shapes PET or PP film up to 700 micrometers with vacuum and air pressure up to 100 PSI, then gas-flushes for MAP, skin, or vacuum packs. ULMA’s TFS 200 MSV runs up to ten cycles per minute, while an aluminum press just stamps coil — no heat, no vacuum.
The decisive split is who runs the machine. TFFS is processor-side — a meat, fish, or ready-meal packer forming and filling in one pass. A CPET tray press or foil press is converter-side, making empty containers sold to those packers.
Pack your own product and you need a TFFS line; make containers and the press comparison above is your decision.
| Decision Factor | Choose CPET Thermoformer | Choose Aluminum Foil Press |
|---|---|---|
| End-customer reheating method | Household microwave (sparks rule out aluminum) | Convection oven, steam oven, broiler |
| Dominant food vertical | Supermarket ready-meals, frozen retail entrées | Airline catering, off-site catering, bakery re-bake, takeaway hot food |
| Merchandising | Transparency aids retail shelf merchandising | Opaque container, branded lid or sleeve handles SKU identity |
| Cavity-adjusted throughput at comparable tooling | Lower (multi-phase cycle, slower tray-class rates) | Higher (single-phase stamping, 40–80 SPM synchronized) |
| Recycling-in-practice | Collection rising (+52% in 2024, NAPCOR) but PET-tray recycling still trails the 30.2% US bottle rate; multi-layer coatings often fall out at sorting | Substantially higher closed-loop rate; clean-metal recycling well-established |
| Mixed-vertical operations | Plan dual lines instead of forcing one to span both | Same — model both, do not force a single line |
For mixed-vertical operators, run the volume on each vertical separately before committing. The CAPEX overlap between a smaller aluminum line and a smaller CPET line often pays back faster than over-sizing one line to serve both verticals poorly.
The within-family C Series vs H Series machines decision belongs to buyers who have picked the aluminum side. The aluminium foil container factory setup checklist is the next document for anyone modeling a dual-line setup.
If your output goes into convection ovens — airline trays, off-site catering, bakery re-bake — specify the aluminum foil container press. Cavity-adjusted throughput at comparable tooling spend and 50 °C of reheating headroom both run in your favor, and the recycling-in-practice gap closes the sustainability question.
If the end customer reheats in a household microwave (supermarket ready-meals, frozen retail entrées), the choice flips to CPET; mixed-vertical operators should model both lines before committing. MTED’s C-Type and H-Type aluminum foil container presses sit in the 40–80 SPM synchronized-line zone — request a quote against your target food vertical to model the line against your monthly volume.
