The main basic material of lamination machine is aluminum foil, OPP colorprinting film and coated aluminum film, etc. The set consists of translational swing type plastic extruder,turning over letoff, laminating machine, turning over type central takein machine and electric control cabinet. The set is designed in accordance with special requirements of film coating bag for jumbo bags. The set consists of translational swing type plastic extruder, letoff, tension bridle, laminating machine, takein machine and electric control cabinet. 1.Special designed barrel screw with big ratio of length to diameter, good plastify property, high output; 2.High precision and adjustable clothes rack type alloy steel die; 3.The double working positions letoff adapts tensile controlling and rectifies a deviation automatically; 4.The increased tension device can spread the cloth level both sides; 5.The on-off between rolls adapts pneumatic control; 6.The surface of double working positions will be taken up through friction and is equipped with transverse cutter, cut cloth automatically, change roll automatically