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DVD 9

       


DVD9 is a single sided dual layer DVD which can fit up to 8.5 GB of information.

DVD9 discs are moulded in the same way as DVD5’s however the blank stamper is replaced by a second approved quality assured stamper containing user data information, one for each layer is used for making up the finished optical disc.

DVD

The Process
Two approved quality assured stampers containing the user data information, one for each layer is used for making up the finished optical disc
                                                        
Both stampers are mounted in there respective moulds of the twin moulding system and conditioned polycarbonate granules are fed into the hopper of the injection screws
                                                        
The granules melt down to produce a moulting liquid plastic which is injected into the mould cavity and formed around the protruding pit structure on the stamper
                                                   
Cooling channels open the mould solidifying the moulding plastic into a 0.6mm solid polycarbonate discs, containing an exact reverse replica of the stampers pit structure
                                                  
The data discs are placed in two separate high vacuum chambers where a thin coat of metal is applied over the pit surfaces.  This is called ‘Metalising’
                                                  
Metalising forms the reflective surface of the optical disc.(without this metal layer the laser light in the player will pass through the disc making it illegible)
                                                  
Layer 0, the nearest layer to the players laser, is metallised with aluminium
                                                  
A layer of UV lacquer is applied between both discs forming a sandwich of discs, metal and lacquer is passed under a UV lamp to fix the lacquer and produces a finished 1.2mm bounded disc.
                                                  
The completed disc undergoes a physical inspection by camera to ensure the cosmetic criteria is within specification
                                                  
The approved finished discs are then stacked on a spindle ready for electrical and mechanical off-line testing in our quality control procedures
                                                  
Once approved the quality assured discs are now ready for printing and packing