How Injera Honeycomb Texture Is Formed on a 600 mm Drum

The eye structure is the product

Injera is judged by its eyes: the open, spongy holes across the top surface. They are not a cosmetic detail, they are the product. A dense injera with no eye structure is a rejected injera, regardless of taste. That single fact drives every machine decision, because the eyes are formed by steam escaping upward through a batter that has to set at exactly the right moment.

Fermentation is what makes it hard

Teff batter ferments. It is acidic, it is active, and its pH keeps dropping while it sits in the supply tank. Ordinary proximity sensors and control electronics that work perfectly on a neutral wheat batter start to drift and fault on fermented teff. This is why a wrapper machine that bakes spring roll sheets reliably can still stop repeatedly on injera: the failure is in the control loop, not the mechanics. The 6QP-8045 and 6QP-12060 run self-developed PLC linkage covered by SHENGXING software copyright, engineered specifically to keep running 24/7 on acidic fermented batter.

Drum width decides whether you get a full-size injera

An injera is a large round sheet. If the drum is narrower than the finished sheet you have to cast in sections, and the seam shows. SHENGXING builds two widths for this product: a 450 mm drum on the 6QP-8045 producing 3,500 pcs/h, and a 600 mm drum on the 6QP-12060 producing 8,000 pcs/h. The 600 mm drum is the widest in the whole SHENGXING wrapper range.

Surface temperature uniformity is the second control

Eyes form evenly only if the drum surface is evenly hot. Proprietary electromagnetic heating replaces resistance tubes and holds drum surface variation within 1 degree C under PLC control, while cutting electricity consumption 15-20%. With resistance-tube heating the hot spots sit where the tubes sit, and the eye pattern patches accordingly.

Why the drum is cast, not rolled

The drum is cast as one piece and ground to a 0.05 mm tolerance. A rolled or welded drum warps under thermal cycling; once it warps, sheet thickness varies across the width and the setting time varies with it, so the eyes form at different rates across one injera. The one-piece casting plus a 0.05 mm grind is what keeps the pattern uniform from the centre to the edge.

Steam retention closes the top face

Injera is baked on one side only. The top face must set without browning, which means steam has to be held over the sheet until the surface closes. That is a cover and airflow design problem, not a temperature problem, and it is the reason a crepe machine cannot simply be re-badged as an injera machine.

One frame, two products

Both models are the same machine frame that also produces spring roll wrapper sheets at 0.3-1.2 mm and +/-0.05 mm tolerance. SHENGXING therefore publishes one page per model designation — /products/6qp-8045.html and /products/6qp-12060.html — with both duties described on it, plus this application page for buyers who search by food rather than by model. Both designations appear on CE certificate M.2022.206.C76950.

Machines referenced in this article