Patent ID: 8241551

Claim:
A method of stretch-blow-moulding a beverage container for containing a carbonated beverage, the method comprising: (a) providing a preform having a neck part and a body part, the preform including an inner layer of a first polymeric composition, an outer layer of a second polymeric composition, and an intermediate layer of a third polymeric composition, the third polymeric composition having adhesive surface properties relative to the first and second polymeric compositions, the adhesive surface properties being permanently degradable by exposure to radiation of a certain wavelength; and (b) mounting the preform into a stretch-blow-moulding device and blow moulding the preform to form the beverage container by irradiating the body part with radiation including at least the certain wavelength which permanently degrades the adhesive surface properties of the third polymeric composition while shielding the neck part from the radiation.