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A steam juicer (steam extractor) is a household kitchen utensil for separating juice from berries, fruits, and some types of vegetables in a process called steam juice extraction that is primarily used for preserving harvests faster they can be consumed when fresh. ==Operation== It makes use of steam to transfer gentle heat directly to the berries that are supported above a boiling water pot in a perforated basket. The juice is collected in the middle section and let out with a small hose while still hot and sterile directly into clean bottles for long term unrefrigerated storage. The quality of the juice is high with little solids due to the non-mechanical extraction process. The units are generally made in a three-tier configuration that somewhat resembles a huge double boiler. The bottom section is a simple pot placed on a kitchen hot plate or gas range to boil water to generate the steam for the process. The next section is the juice collection container with an opening in the middle to pass the steam through. It has a hose fitting that is used to drain it directly into storage bottles. The top section is a perforated basket (with a loose-fitting lid) to hold the berries while allowing the steam to reach the complete batch but holding the berries (pulp, skins and pips) out of the extracted juice. The process is convenient and as safe as any other stove-top cooking. The steam is not held under pressure and the juice is delivered with a rubber hose that requires minimal extra operations, occasionally a funnel with a strainer may be used to make the bottling more convenient. As usual one needs to be careful of scalding hot juice and the possibility of pulling over the tall juicer. When loading the charge of berries into the strainer section sugar may be added (in alternating layers) the amount depending on the projected use, sugar also acts as a preservative. Other additives may be pectin to prepare jellies, ascorbic acid to improve shelf life and other ingredients that will dissolve and mix with the juice as it is extracted. To get a consistent batch of juice the whole charge is allowed to extract and then bottled when complete; draining of the juice as it extracts will result in different compositions from start to end of the batch. Long dwell times in juicers made from aluminium when preparing acid juices is not recommended. Increasing the steam flow-rate may improve the juice extraction rate. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Steam juicer」の詳細全文を読む スポンサード リンク
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