The invention discloses a double-layer composite
hot melt adhesive film adhering
metal and plastic, which is formed by compounding an upper
adhesive film layer and a lower
adhesive film layer, wherein the lower adhesive film layer is attached to a piece of release paper, the thickness of the composite adhesive film is 0.05 to 0.20
millimeter, the upper adhesive film layer is a
hot melt adhesive layer adhered with the
metal, the thickness of the upper adhesive film layer is 30 to 60 percent of the thickness of the
composite film, the lower adhesive film layer is a
hot melt adhesive layer adhered with the plastic, the thickness of the lower adhesive film layer is 40 to 70 percent of the thickness of the
composite film, and the lower adhesive film layer is attached to a piece of
glassine release paper. The double-layer composite
hot melt adhesive film directly compounds two modified hot melt adhesives with different adhesive properties, is adhered with the release paper to prevent rolling from adhering and the adhesive film from being damaged, reduces application of a middle isolating layer, reduces the thickness of the composite adhesive film, and is prepared by once
casting through coextrusion
casting equipment or twice
casting through common coextrusion casting equipment. The double-layer composite
hot melt adhesive film can be used for composite adhesion of
metallic materials such as aluminum, stainless steel and the like and plastic such as ABS, PVC, PET and the like, is particularly suitable for mutual adhesion between sheets, plates and films of the
metal and the plastic, and has simple and convenient operation and no
pollution.