abstract |
The present invention relates to a uniaxial or biaxially stretched polyester resin foam sheet and film, wherein the polyester resin is at least 1500 Pa at 280 ℃ for a melt strength of at least 1 centinewton at 280 ℃, a shear rate close to zero It has a melt viscosity of .s and a crystallization rate of 30 to 35% crystallinity when heated to 120 ° C. for 10 minutes.n n n Polyester, foam sheet, drawing, melt strength, melt viscosity, crystallinity |