The Pre-Folded Parchment Pouch

Most operators treat parchment as a disposable non-stick sheet. Between the filter bag and the collection cylinder, it is actually doing three separate engineering jobs at once, and each has its own failure mode when it's torn, folded by eye, and trimmed with scissors.

The pouch starts as a flat parchment sheet with engineered cut lines. Roll it, let the cut lines interlock, and it holds a cone shape on its own. No measuring, no guessing. Sized to the press, four of them converge so every pouch tip points at the central drain and the outer edges sit inside the plate perimeter. The design intent is simple: give the oil one opening to leave by, and put that opening off the heat plates.

That's the opposite of the conventional workflow, where an operator tears a sheet, folds it by eye, trims it, and hopes the seams hold under pressing force. Every improvised fold is a possible leak path, every uneven edge a possible blowout exit, and every misaligned pouch a puddle of resin on bare plate. The pre-folded pouch turns that craft skill into a fixture: the correct geometry is manufactured in, not measured out.

As plant material fills most of the insert, the puck becomes a wall and the parchment becomes the tunnel, and the oil moves faster along that open channel. A walled tunnel with one exit keeps the extract moving instead of letting it spread into a slow, thin film that keeps absorbing plate heat. In the flow terms of the bag guide, the pouch sets the cross-section and direction of the extract's final channel.

The last stretch of the flow path is where the extract is hottest, most fluid, and closest to open air, so it's where every degradation variable from The Closed Collection Path (time-at-temperature, exposed surface, oxygen and light, contamination) is still in play. A defined, short, single-exit channel works on all of them at once:

• Speed off the heat. A walled tunnel maintains flow velocity instead of letting resin spread into a slow, heat-absorbing film.
• Less exposed surface. Extract confined to the channel presents far less surface to the air than resin flooding across a plate.
• No plate contact, no scraping. The release surface keeps the extract off the metal, so collection needs no tools and no added handling steps.
• Cleaner equipment. The pouches lift out, so plates stay clean, turnaround is quicker, and cross-batch carryover risk drops.

Three surfaces, one continuous path. The V3.7 bag governs the micro path (material to mesh exit). The parchment pouch governs the intermediate path (mesh exit to plate discharge). The cone press and seated cylinder govern the macro path (drain to protected collection). The pouch is the connective tissue: without it, the bag's controlled exit dumps onto an uncontrolled surface and the press's drain takes whatever flow pattern chance provides. With it, the functionally closed collection path is unbroken from material to collection. Functionally closed, not sealed or airtight.

An honest boundary. Parchment is a common material and this is not a statement about anyone else's parchment. The claims here are qualitative and mechanism-based: release, cleanliness, and repeatability comparisons require controlled testing and are not asserted as numbers.