| 摘要 |
Discrete particles consisting of thermoplastic synthetic resin, which are adapted to melt and to produce a high frequency weld joint under the action of a high frequency field and to resist the action of detergents and dry cleaning agents are arranged on at least one boundary surface of a support structure which is permeable to gas, vapor and liquid, and which is preferably constituted by a continuous web to which the particles are preferably fixed by the application of pressure and/or heat. An additional layer, preferably also consisting of a continuous web, is then applied to the one boundary surface of the support structure and the thus-formed composite structure is subjected to the action of a high frequency field to provide a welded joint connecting the additional layer to the support structure.
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