FIELD: ultrasonic technology.
SUBSTANCE: strong hermetic sealing has some number of alternating ultrasonic point connections disposed close to each other. At least two layers of material, for example, of non-woven linen laminated onto waterproof film can be held together by means of those point connections. Point connections can form pattern in such a manner that material which shifts during technological process of binding blocks passage of any fluid through point connections.
EFFECT: improved efficiency.
27 cl, 1 ex, 1 tbl, 2 dwg
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