METHOD FOR CARRYING OUT VENTILATION IN A MULTI-WALLED CONTAINER

摘要

The invention relates to a method for carrying out ventilation in a multi-walled container of the type comprising a rigid external housing (2), inside which a flexible inner pocket (3) for containing a product is arranged and connected to a withdrawal device without ventilation, said layers (2, 3) having no adhesion between the same such as to be able to be separated without difficulty and with air ventilation (7) between the same, characterised in being obtained by means of moulding a projection (9) at the upper or lower part of the pre-form (5) which is subjected to a first operation of cutting a sprue (6), then a second operation of cutting said projection (9) in a region close to the base and/or the neck of the recipient (1) for production and a third operation of separating the layers (2, 3).