FIELD: packaging industry.
SUBSTANCE: invention relates to a method for manufacturing a polymeric container with a marking. At first, the resolution of lpi image of the marking in two mutually perpendicular directions is determined from the ratio: lpi= Li / (d⋅k1⋅k2) points / mm, where Land is linear size of the marking image on the final product, mm; d is the diameter of the waist of the laser radiation, mm; k1 is the coefficient of increase in the diameter of the container as compared to the blank; k2 is the coefficient of material properties of the container, defined as k2= D / d, where D is the diameter of the spherulites formed in the near-surface layer of the container after thermomechanical action to the blank, d is the diameter of the waist of the laser radiation. Then focused laser radiation is applied to a preset pattern of the marking image on the blank of the polymer container, heated to a temperature equal to (0.3-0.4)⋅Tc, where Tc is the glass transition temperature of the container material, °C, at a laser radiation energy lower than the ablation threshold. Finally, the container is formed using thermomechanical action to the blank with the image of the marking applied.
EFFECT: method requires less energy and allows to reduce the time of applying the marking.
11 cl, 3 dwg, 1 ex
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Authors
Dates
2018-04-25—Published
2016-08-05—Filed