| 摘要 |
FIELD: special packages designed for transportation of confidential correspondence and valuable objects and securities, for instance, bank notes. SUBSTANCE: bag is made of nontransparent duplex synthetic film material by bending of material and welding the edges to form weld seams and open mouth provided at one side with sealing part made of transparent or clear film with applied layer of adhesive covered by protective tape, and at other inner side of mouth in contact with sealing part, and indicator strip with definite pattern covered with layer of dye. Sections of indicator strip with pattern have adhesive properties differing from those of sections free from pattern. Weld seams of bag are made riffled in form of digit and letter signs with depth of signs equal to or greater than thickness of plate of nontransparent duplex synthetic film. Weld seam can be made of wave or zigzag shape. Individual No. of bag is made by burning through outer layer of material by laser beam with preservation of integrity of inner layer. One or more notch lines is made ion sealing part and nonrestorable tearoff of bag is done along notches and seam. Layer of dye applied to indicator strip leaves traces of dye when acted upon by solvent. EFFECT: improved safety against criminal opening, preservation of enclosures and confidentiality of transported correspondence. 4 cl, 7 dwg
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