Abstract: A biodegradable biaxially oriented laminated film of the present invention comprising at least one first resin layer and at least one second resin layer which are alternately laminated together, the first and second resin layers containing as major components a polylactic acid-based polymer and an aromatic polyester-based resin, respectively, exhibits improved biodegradability, flexibility, gas-barrier property and heat-resistance, which is useful for environmentally friendly packaging.

Abstract: Disclosed herein is a heating mat using four heating sections. The heating mat includes a left heat generation unit, a right heat generation unit, a negative potential generation device, and an operation unit. The left heat generation unit includes first and second heating wires, which are respectively mounted in the left upper and left lower portions of the mat with respect to the central point of the mat. The right heat generation unit includes third and fourth heating wires, which are respectively mounted in the right upper and right lower portions of the mat with respect to the central point of the mat. The negative potential generation device generates a negative potential. The operation unit is electrically connected with the left and right heat generation units on one side of the mat.