FIELD: chemical industry; light industry; other industries; production of the caps for the packing tare sealing.
SUBSTANCE: the invention is pertaining to production of the caps used for the packing tare sealing. The cap is made with the capability of its fixation by means of the thermal welding to the opening of the hermetic bowl and the subsequent its opening. At that the cap contains the layer of the fibrous material, the polymeric layer, the barrier layer concerning the oxygen and the polymeric thermosealing layer. At that the thermosealing layer contains: the copolymer of ethylene and methylacrylate, the copolymer of ethylene and vinylacetate and the polyamide wax. The thermosealing layer is fixed directly on the barrier layer in relation to the oxygen layer having the more higher fusion point - all without any intermediate binding agents. The presented invention also concerns to the method of manufacture of the cap, and also the hermetic bowl supplied with the above-mentioned cap, and to the method of manufacture of the above- mentioned bowl. The invention ensures manufacture of the cap attached by the thermal method and easily opened, besides, the given cap may be manufactured by extrusion within the limits of one operation, and also to diminish the number of the polymeric layers applied one over another.
EFFECT: the invention ensures manufacture of the cap attached by the thermal method and easily opened, besides, the given cap may be manufactured by extrusion within the limits of one operation, and to diminish the number of the polymeric layers applied one over another.
17 cl, 5 dwg, 3 ex
