| 摘要 |
Sachets are made from at least one thin and flexible film (10, 18) of a wate r- soluble and edible polymeric material, the film and/or films being shaped to define a sachet and filled with a food material (16), and being sealed to fo rm a peripheral seal by RF welding between opposed electrodes (12, 20). The fil m may be of starch. The sachet and contents are added to water, without needin g to be cut open, before being eaten or drunk, or cooked. For example the food material might be coffee powder or dried soup, or a mixture for making bread ; the film dissolves readily and is substantially tasteless. RF welding provid es reliable seals despite any powder on the surfaces of the film. |
