Process for reducing the residual aldehyde content in polyester and polyamide compositions

The polyester, such as poly (terephthalic acid B one of PET), or the polyamide, and one is wherein when the mixture of the hydroxylamine stabilizer and nitric acid of stabilizer and amine oxide stabilizer's hydroxylamine stabilizer and is suitable agent which comprises the alignment mixing, a display ratio of the polyester or polyamide performing comprising the steps of lower residual content acetaldehyde. The invention any suitable for manufacturing the moulded article, or fibre membrane polyester or polyamide, for example is used for bottle system containing or polyester or polyamide, the bottle or vessel can be used to the expense material, such as food, beverage and water.