Integrally blow-moulded bag-in-container comprising an inner layer and an layer comprising energy absorbing additives, preform for making it and process for producing it

A process for producing a bag-in-container comprising the following steps:

• providing a polymer preform having an inner layer and an outer layer, wherein said preform forms a two layer container upon blow-moulding, and wherein the obtained inner layer of said container releases from the obtained outer layer upon introduction of a gas at a point of interface between said two layers;
• and
• at least one of said inner and outer layers includes at least one additive allowing both inner and outer layers to reach their respective blow-moulding temperatures substantially simultaneously upon heating them together in a single oven
• heating said preform to blow-moulding temperature in a single oven;
• and
• blow-moulding the thus heated preform to form a bag-in-container;
• wherein the type and amount of additives in at least one of the inner and outer layers of said preform are such that said two layers reach their respective blow-moulding temperatures substantially simultaneously.

A bag-in-container made by the process comprising:

• providing a polymer preform having
• an inner layer and an outer layer, wherein said preform forms a two layer container upon blow-moulding, and wherein the obtained inner layer of said container releases from the obtained outer layer upon introduction of a gas at a point of interface between said two layers;
• and
• at least one of said inner and outer layers includes at least one additive allowing both inner and outer layers to reach their respective blow-moulding temperatures substantially simultaneously upon heating them together in a single oven
• heating said preform to blow-moulding temperature in a single oven;
• and
• blow-moulding the thus heated preform to form a bag-in-container;
• wherein the type and amount of additives in at least one of the inner and outer layers of said preform are such that said two layers reach their respective blow-moulding temperatures substantially simultaneously.