Seamless can and a method of producing the same

A seamless can obtained by forming a laminated material of a metal and a polyester film into a cup such that a final draw ratio defined by H/D, where H is equal to said can's height and D is equal to the diameter of said can's bottom portion, is not smaller than 1.5, wherein a polyester (A) on the bottom portion of the can has a biaxial orientation degree Rx defined by the following formula,

• Rx=I.sub.A /I.sub.B
• wherein I.sub.A is a diffraction intensity by a diffraction plane having a spacing of about 0.34 nm CuK.alpha. X-ray diffraction angle is from 24.degree. to 28.degree. in parallel with the polyester film surface on the bottom portion, and I.sub.B is a diffraction intensity by a diffraction plane having a spacing of about 0.39 nm, where the CuK.alpha. X-ray diffraction angle is from 21.5.degree. to 24.degree. in parallel with the polyester film surface on the bottom portion;
• of from 2.5 to 20, and a polyester (B) on the barrel portion of the can has a monoaxial orientation satisfying the following formula,
• 0.6<cos.sup.2 .phi.<0.95-exp ›-0.45I.sub.A /I.sub.B -1.1.epsilon.+0.53!
• wherein cos.sup.2 .phi. is an index representing the degree of monoaxial orientation of the polyester film at a portion where the barrel portion is measured, and is given by the formula, ##EQU8## wherein (I.phi.) is an X-ray diffraction intensity at an angle .phi. by a diffraction plane having a plane index of -105 and having a spacing of about 0.21 nm, where the CuK.alpha. X-ray diffraction angle of from 41.degree. to 45.degree. at right angles with the polyester film surface, .phi. is a value represents by the .beta.-scanning angle of X-ray diffraction up to -90.degree. presuming that the angle of structural inclination between a vector of a normal on the diffraction plane and the polyester fiber axis is zero with respect to the height direction of the can, I.sub.A is a diffraction intensity by a diffraction plane having a spacing of about 0.34 nm, wherein the CuK.alpha. X-ray diffraction angle of from 24.degree. to 28.degree. in parallel with the polyester film surface on the bottom portion of the can, I.sub.B is a diffraction intensity by a diffraction plane having a spacing of about 0.39 nm, where the CuK.alpha. X-ray diffraction angle of from 21.5.degree. to 24.degree. in parallel with the polyester film surface on the bottom portion of the can, and .epsilon. is a considerable strain by the processing of the laminated material at the can body measuring portion,
• and that the thickness of the barrel portion is reduced by more than 30%.