Polyester composite film applied to extrusion coating type packaging bags and preparation method of polyester composite film
A polyester composite film and packaging bag technology, applied in chemical instruments and methods, synthetic resin layered products, layered products, etc., can solve the problem of broken bags, low composite fastness of PET layer and PE layer, and inability to meet the requirements of retort bags. Demand and other issues, to achieve high composite fastness, avoid solvent-based adhesives, and use less raw materials
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[0028] Example one:
[0029] Such as figure 1 As shown, a polyester composite film for extrusion coating packaging bags is composed of a base material layer 1, a crosslinking agent layer 2 and a hot melt layer 3, wherein the material of the base material layer 1 is biaxially stretched polyester For the film, the material of the crosslinker layer 2 is a water-based primer cured crosslinker, and the material of the hot melt layer 3 is high density polyethylene. The cross-linking agent layer 2 is coated on the corona treated surface of the biaxially oriented polyester film. After drying, the melt-extruded high-density polyethylene is coated on the cross-linking agent layer 2 to form a hot melt layer 3, namely The linking agent layer 2 is located between the base material layer 1 and the hot melt layer 3. The crosslinking agent layer 2 is in contact with the surface of the biaxially oriented polyester film with a surface wetting tension of 56-62dyn and a roughness of 0.02-0.07μm. Th...
Example Embodiment
[0037] Embodiment two:
[0038] 1) Select a biaxially oriented polyester film with high surface wetting tension as the substrate layer, and perform corona treatment on its surface;
[0039] 2) Coat the corona treated surface of the biaxially oriented polyester film with a water-based primer curing crosslinking agent solution, and then enter it into an oven at 60°C for drying for 0.5 seconds;
[0040] 3) The high-density polyethylene is melted at a high temperature of 330°C and extrusion coated on the surface of the biaxially oriented polyester film coated with a water-based primer curing crosslinking agent;
[0041] 4) After coating, the cold roll and the back pressure roll are cooled and pressed together, and then trimmed, drawn and rewinded to obtain a finished polyester composite film with a three-layer structure. The temperature of the cold roll is 12°C.
[0042]
Example Embodiment
[0043] Example three:
[0044] 1) Select a biaxially oriented polyester film with high surface wetting tension as the substrate layer and corona treatment on the surface;
[0045] 2) Coat the corona treated surface of the biaxially oriented polyester film with a water-based primer curing crosslinking agent solution, and then enter it into an oven at 80°C for drying for 1 second;
[0046] 3) The high-density polyethylene is melted at a high temperature of 310°C and extrusion coated on the surface of the biaxially oriented polyester film coated with a water-based primer curing crosslinking agent;
[0047] 4) After coating, the cold roll and the back pressure roll are cooled and pressed together, and then trimmed, drawn and rewinded to obtain a finished polyester composite film with a three-layer structure. The temperature of the cold roll is 9°C.
[0048]
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