FIELD: process engineering.
SUBSTANCE: proposed billet has hollow body with lateral wall running around lengthwise axis and end wall located across said lengthwise axis. Point A of said end wall features definite specific enthalpy of residual fusion. That latter equals the difference between full fusion specific enthalpy and specific enthalpy of a part of amorphous phase that crystallises on heating. Said magnitudes are measured by differential scanning calorimetry. Note here that, at least, one point B, F, L, and O of lateral wall, features different residual fusion specific enthalpy exceeding aforesaid value. Invention covers also the container made from said billet.
EFFECT: longer life of products.
20 cl, 18 dwg
