Abstract
AbstractThe packging industry seals mainly with heat‐contact (HC) techniques, but is using ultrasonic (US) techniques more and more. Less widely practiced are high‐frequency (HF), which are used in only a few cases.High‐frequency techniques have two different working principles: the dielectric principle and the inductive principle. The dielectric principle was first applied in manufacturing plastic (particularly PVC) clothing, while the inductive principle is used in the heating of metals in a high‐frequency electric field, for instance in hardening and refining steel. Nowadays, these techniques are often used in the automobile, clothing, and pharmaceutical industries, and in manufacturing office equipment and sports articles.The Swiss Packaging Institute (SVI) and EMPA have recently started a research project on this subject that will study potential examples of the application of these techniques in modern packaging. The preliminary study of the literature is now completed and is reported here.
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