Aluminium foil sealing film and preparation method thereof

Abstract

The invention provides an aluminium foil sealing film and a preparation method thereof and belongs to the technical field of plastic packaging. The aluminium foil sealing film comprises a protective layer, a separation layer and a heat-seal layer, wherein the protective layer is a gloss oil layer or a PET (Polyethylene Terephthalate) film layer; the separation layer is an aluminium foil layer; and the heat-seal layer comprises the materials as follows: 15 to 25 wt% of polybutene, 25 to 35 wt% of ethylene-propylene copolymer and 40 to 60 wt% of HDPE (high-density polyethylene). As a sealing film for the bottle mouth of a polypropylene plastic bottle, the aluminium foil sealing film provided by the invention has the excellent properties of cooking resistance and easiness for uncovering, and when the cooking-resistant temperature is 121 DEG C, the sealing film is unchanged in color and is not stratified. The opening force is 5 to 25 N after the sealing film and the polypropylene bottle are heat-sealed at 200 DEG C, and the heat-seal strength of a heat-seal strip with the width of 15 mm is 5 to 25 N, which shows that the aluminium foil sealing film has the excellent properties of cooking resistance and easiness for uncovering at the same time.

Description

technical field

[0001] The invention relates to a sealing film and a preparation method thereof, in particular to an aluminum foil sealing film used for polypropylene bottles, and belongs to the technical field of plastic packaging. Background technique

[0002] Aluminum foil sealing film is widely used in the bottle mouth packaging of polypropylene plastic bottles. Aluminum foil sealing film is usually composed of varnish layer or polyethylene terephthalate (PET) film, ink, aluminum foil, polyethylene film or cast polypropylene film, wherein the varnish layer or polyethylene terephthalate The polyester (PET) film is the outer layer, which is used as the protective layer of the sealing film to protect the ink layer in the sealing film, and the polyethylene film or cast polypropylene film is the inner layer, which is used as the heat-sealing layer of the sealing film to generate heat. sealing effect. When the aluminum foil sealing film is prepared, ink is usually applied to...