When a coffee brand asks how aluminum capsules are made, the answer usually comes from a filling-machine vendor and skips the upstream production line where the empty shell is actually formed. What looks like one machine is actually two production lines.
The choices on the forming line — alloy temper, foil thickness, cavity count, draw geometry — fix whether the finished capsule holds 19 bar of extraction pressure without splitting.
Aluminum coffee capsules are produced on two physically separate lines. The first is a deep-drawing forming press that converts coil aluminum into empty truncated-cone shells. The second is a downstream auger-and-lid line that doses coffee and heat-seals a foil lid on top.
The two lines have different OEM categories, footprints, and capital justifications. That is why “capsule machine” RFQs rarely match what the buyer actually needs.
The forming press runs independently as the upstream stage. Food-grade aluminum coil feeds into a transfer press that draws each shell across multiple cavities in a single stroke. The output is empty lacquer-coated cups ready for the next stage.
The filling-and-sealing line is often a different supplier entirely. It takes those shells, doses coffee, flushes the headspace with nitrogen, and seals the lid. Buyers who RFQ a “capsule machine” vendor get quoted on the second line and only later discover the forming line is a separate purchase.
The forming stage breaks into four spec dimensions every empty-shell line is set by.
Commercial coffee capsule forming uses food-grade aluminum foil from the 8xxx-series family. The production grade that actually runs on capsule lines is 8011-O or 8079-O, optimized for deep drawing without micro-cracking.
Generalists cite “1100 alloy, 99% pure,” but 1100 is a separate 1xxx-series alloy. Specialists writing tooling specs name the grade — 8011-O for most lines, 8079-O when extra ductility is needed. The O-temper (fully annealed) is non-negotiable; harder tempers tear at the draw radius.
Body foil runs 0.07-0.12 mm (70-120 µm); the foil lid is much thinner at 0.03-0.04 mm.
The press is a deep-draw transfer press in two tonnage classes. Compact systems run 45-80 ton with 1-5 cavities for smaller lines. High-volume systems run 63-80 ton with up to 6 cavities for commercial output.
This forming stage is what a dedicated coffee-capsule press handles. MTED’s H Series coffee capsule forming line operates at 63-80 ton with up to 6 cavities. The line is sized for the truncated-cone Nespresso Original geometry: top OD 37 mm, base OD 24 mm, height 29 mm, drawn wall around 110 µm, empty weight about 1.0 gram per shell.
Cavity count multiplies stroke output. A 2-cavity tool at 40-50 strokes per minute yields roughly 4,800-6,000 shells per hour on a KONIX-class mold.
Higher-end Anistek-class equipment is cited at 6,000-30,000 pcs/hour depending on cavity count and press speed. The press, not the filler, sets your daily ceiling — and cavity count is the single biggest lever.
Before drawing, the foil already carries the food-contact lacquer that lines the shell interior. The options are either an epoxy or BPA-non-intent (BPA-NI) barrier, or a modified polypropylene dispersion that is both BPA-free and PVC-free (Aikoufoil’s R-series activates in 0.2-0.4 seconds at 220°C).
The lacquer is doing engineering work, not cosmetics. It keeps acidic coffee off bare aluminum during 9-19 bar extraction, with compliance to FDA 21 CFR 175.300 (50 ppm overall migration) and EU Regulation (EC) 1935/2004 (≤10 mg/dm², the overall migration limit of Regulation (EU) No 10/2011).
Windisch et al. 2020 measured aluminum in capsule-brewed coffee at 18.26 ± 6.01 µg/L versus 72.57 ± 23.96 µg/L from a moka pot — a four-fold difference credited to the lacquer barrier. Alloy temper, foil thickness, and lacquer chemistry on the forming line fix downstream brewing performance.
After forming, empty shells move to a separate filling-and-sealing line. A servo-driven auger doses ground coffee to ±0.2 g, multi-port nitrogen flushing brings headspace oxygen below 1%, and a foil lid is heat-sealed onto the rim.
Rotary lines run 100-600+ CPM; in-line systems run 40-200 CPM. Every spec beyond that point belongs to a different OEM and a different RFQ.
For most coffee brands launching aluminum capsules, the real question is whether to spec a forming press or buy empty shells from a co-packer. The answer comes down to forming-press utilization economics, not headline equipment price.
Per-shell in-house cost is press depreciation plus operator labor plus alloy, divided by shells per day. The shells-per-day denominator is cavity count times stroke rate times shift hours.
The crossover sits where that denominator amortizes the press cost past co-packer pricing, factoring in their margin and logistics. Brands forecasting steady high-volume output that lets a 6-cavity 63-80 ton line run at meaningful utilization will hit it.
Brands building inventory in fits and starts, or running a single SKU at modest volume, will not. The press depreciates idle while a co-packer averages utilization across many customers. Run the math against real shift hours and real cavity count, not nameplate output.
The most common mistake at the RFQ stage is sending the same brief to forming-press OEMs and filling-line OEMs as if they quoted the same machine. Aluminum coffee capsules are produced on two physically distinct lines — the empty shell forming press and the downstream filling and sealing line.
The forming-stage quote is where the real engineering choices live. Those choices are alloy grade, foil thickness band, press tonnage class, cavity count, and lacquer chemistry that clears FDA and EU compliance at 9-19 bar.
Get those answers right on the empty-shell forming line and the filling spec becomes a simpler conversation. Defer them to a co-packer and you have outsourced the part of the process that decides how your brewed coffee actually tastes.
