3 Final processing depends on the type of carrier. Reservoir type patches must be filled with the drug mixture. The drug-adhesive matrix described above is coated onto silicone-treated polyester film. The silicone ensures the patch can be easily removed to expose the adhesive layer. The completed patch is oven dried to remove solvents and then laminated to a carrier or backing strip. This backing strip can be further processed by die cutting and then packaged as a finished product
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