Plastic container with high mechanical strength and airtightness and its manufacture

Such containers include (A) a gas-impermeable polyolefin and polyester layer; (B) another thermoplastic resin layer. The strength of the adhesive portion of the container is not less than 60% of the strength of the non-adhesive portion. For example, high-density polyethylene is first injection molded into a film, and then a mixture containing high-density polyethylene and PBT is injected on the high-density polyethylene layer to obtain a double-layer molded sheet, which is then made into a container. The interlayer adhesion.