METHOD AND DEVICE FOR SELECTIVELY HEATING A CONTAINER PREFORM

摘要

A preform (3) for use in making a container such as a bottle from a thermoplastic material is selectively heated prior to at least one step of blow moulding or stretch-blow moulding the heated preform. For this purpose, at least most (7A) of the radiation (4) transmitted generally towards the preform (3) by a source (1A) is focused (8) onto a preferred area (A) thereof, said source being located substantially opposite said preferred area (A) of the preform, whereby said preferred area (A) receives most (7A) of the radiation (4) while the areas adjacent to the preferred area (A) do not receive the radiation fraction initially transmitted towards them by the source.