| abstract |
A method of stretch-blow-moulding a product, such as a bottle or container, from a preform, comprises providing the preform including an inner blank of a first polymeric composition, and an outer blank of a second polymeric composition different from the first polymeric composition. The inner blank is loosely positioned within the outer blank, the first polymeric composition having a first absorption spectrum and the second polymeric composition having a second absorption spectrum different from the first absorption spectrum. The first absorption spectrum includes a first absorption peak wavelength or wavelengths and the second absorption spectrum includes a second absorption peak wavelength or wavelengths. The method of stretch-blow-moulding a product further comprises irradiating the preform with radiation of a first intensity for a first specific period of time and irradiating the preform with radiation of a second intensity for a second specific period of time so as to cause the first blank to be solidified independently of the solidification of the second blank. |