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Built structures · Drying kilns and dryers

Drying cabinet with lined trays

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A dehydrator or drying box set up with mesh trays for slices and herbs and solid liners for purées, drying by warm moving air to a recipe's own endpoint.

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Illustration of Drying cabinet with lined trays.

Overview

A drying cabinet replaces sun and wind with controlled airflow and heat. It dries fruit sheets, herbs, sliced vegetables and steamed sweet potato. The lined trays take purées that mesh trays cannot hold.

Moving air carries water from the surface. Heat speeds evaporation, but too much case-hardens the surface (Excalibur, Brød & Taylor). Evaporation keeps wet food cooler than the air. Solid liners block airflow from below, so the thickness of the purée controls the drying.

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Endpoints and water activity

Endpoints are food-specific: no indentation at a leather's centre, crumbling herbs, brittle vegetables. Cabinet humidity is not the food's water activity. Water activity is measured on a sample in a sealed chamber (FDA).

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Documented uses

Fruit leather is dried on lined trays at 140 °F (University of Georgia mango leather recipe).

Herbs are dried in a single layer at 95 to 115 °F (University of Georgia herb guide, from So Easy to Preserve).

Hoshiimo (proposed): steamed sweet potato slices dried in the cabinet, as described in Japanese food-ministry material. Tarhana (proposed): drying of the fermented dough, from a Brazilian study of tarhana fermentation.

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Measuring

Measure the thickness, the load, the room humidity, the drying time and the recipe's dryness test. Condition the food and check for condensation before storage.

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Limits

A cabinet does not reproduce sunlight's chemistry or outdoor day-and-night cycling. Air humidity and weight loss do not establish water activity.

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History

The sources are current appliance guides and extension recipes. They describe drying by controlled airflow and heat in place of sun and wind. They do not date the first use of a drying cabinet.

Site

SettingA kitchen or dry room: a dehydrator or drying box with mesh trays and solid liners, drying food by warm moving air.
ClimateWarm, moving air from the appliance's heater and fan; the room's humidity affects drying time.
NotesAir humidity and weight loss do not establish water activity. No source gives the cabinet's dimensions.

A build is made where it stands: moving it means building it again.

How it is built

Risks and precautions · Standard risk
Moisture left in dried food

Condensation in stored dried food can let it spoil, and mouldy food is not safe to eat.

Hazard source

Cool completely before packing.

Control source

Re-dry any food that shows condensation. Discard mouldy food.

Control source

Materials

  • 1 Dehydrator or drying box — Horizontal airflow is preferred for mixed loads (NCHFP).
  • Mesh trays — For slices and herbs.
  • Solid liners — Purpose-made sheets, plastic wrap or silicone mats for purées. They hold the purée but block airflow from below.
  • 1 Thermometer — For the air temperature.
  1. Set the dehydrator with horizontal airflow for mixed loads.
  2. Put slices and herbs on mesh trays, and purées on purpose-made sheets, plastic wrap or silicone mats.
  3. Leave space between pieces. Set the thickness to control the drying of a lined purée.
  4. Dry at the air temperature the recipe gives. Fruit leather is documented at 140 °F; herbs in a single layer at 95 to 115 °F.
  5. Test for the recipe's own endpoint: no indentation at the centre of a leather, crumbling herbs, brittle vegetables.
  6. Cool completely before packing. Re-dry any food that shows condensation, and discard mouldy food (NCHFP).

Places

Documented for international use, with no single place of origin assigned.

Related

Used for

  • Fruit leather

    Fruit pulp spread into thin sheets or shaped into cakes and dried, a compact, portable way of keeping fruit in western and central Asia and among Indigenous North Americans.

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  • Drying and freeze-drying at home

    A dehydrator turns fruit purée into leather and steamed sweet potato into hoshiimo without sun or wind; a freeze dryer works differently. Both stop microbes growing by removing water, and neither replaces a step that kills them.

Modern era

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    A dark, balanced vinegar from Emilia-Romagna made by combining cooked or concentrated grape must with wine vinegar, then acetifying and refining it in wood under a protected specification.

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    A living dairy inoculum that starts controlled cream fermentation, developing acidity and aroma before sour cream or cultured butter is finished.

  • Adjustable yogurt-maker

    A small electric incubator holds jars at a selected temperature for yogurt and other documented warm food preparations. Controls, capacity and vessel arrangement vary by model.

  • Adygean salt

    Adygean salt is a seasoned table salt associated with Adygea and the wider North Caucasian culinary tradition. Salt is blended with garlic and a variable selection of herbs and spices; the exact mix depends on the named style and maker.

  • African Caesar-group mushroom

    The African Caesar-group mushroom, Amanita masasiensis, is a wild ectomycorrhizal species of central and southern African woodlands, eaten locally. The genus contains deadly poisonous species, so identification needs care.

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