Eliminating BOPA and Polyvinyl Chloride (PVC) films in the cold-formed Alu-Alu laminate blister pack for pharmaceuticals has for long remained a daunting task for packaging experts.
A conventional cold-formed pharmaceutical blister back emits chlorine on exposure to sunlight. This is extremely harmful for the environment. PVC also contains plasticizers with phthalates linked to a host of health disorders that can damage the liver, kidneys, lungs and reproductive system. PVC film leaves high carbon footprint making it further undesirable from the environmental perspective besides exhibiting very low temperature resistance which is yet another shortcoming.
BOPA (BON) on the other hand is also fraught with challenges like high moisture absorption to the tune of 8-10% making its processing difficult; leading to de-lamination and impairing the ability of the film to be chemically primed.
Keeping these challenges of BOPA and PVC substrates in mind, the team at Flex Films (film manufacturing arm of India’s largest multinational flexible packaging materials and solution company Uflex, Ltd.) undertook extensive R&D activities for almost two years to come up with a special polyester film that obviates the problems posed by BON and PVC. The special polyester film is all set to replace the top and bottom substrates of the conventional cold formed Alu – Alu laminate to a whole new structure comprising 36-micron special polyester / 50-micron soft aluminium foil / 36-micron special polyester.
Polyester is a para-crystalline material which possesses excellent barrier, clarity, printability, and hardness properties. Film forming and orientation of polyester augurs well for the creation of thin profile webs with excellent properties for use in flexible packaging.
This specialty substrate that has been developed by Flex Films can be laminated on both sides of the aluminum foil without any problem quite like the laminate comprising BOPA, aluminum foil and PVC films. The engineers at Flex Films have been successfully able to bring metaphase morphology which has made it possible to form the film in Z direction which is a pre-requisite for blister packaging.
More info: www.uflexltd.com