We do the Environmental Microbiological testing annually. It will be necessary to consider testing as per Clause 4.8.5 in the new BRC Packaging Standard - Issue 6.
We clean our rollers etc with common solvent ( in our case 80% n-Propyl Alcohol & 20% n-Propyl Acetate).
We check the following parameters during the printing process - substrate used for printing ( type,colour, size and gauge), corona treatment on the film, whether printed on the correct side of the film, Ink adhesion with 3M Scotch 600 tape test, print type to the standard/ approved artwork, registration of colours, print colours with PMS colour book and X-Rite spectrodensitometer, repeat length of print, image width, number of prints around the cylinder, number of prints across the cylinder, eye spot size, colour and position, bar code number, colour and scanning grade and most importantly the residual solvents with Gas Chromatography for food contact and hygiene sensitive materials.
Can you please attach the procedure or description sheet of the check of some of those parameters