"However we re-use hairnets in the sense off, whenever someone leaves the production area they keep their hair net safe and re-use the hairnet when they return. I have had numerous fights with management with regards to this but unfortunately my hands are tied. So my other question is... Should I than rather let them not take off the hairnet at all during the day even during lunch and tea breaks, or what should I do?"
Copy this into a letter:
Dear Valued Customer,
Sorry for the hair inclusion, however please be aware of our re-use policy.
Our Senior Management (Joe Johnson, Tim Peterson, whatever their names are go here) dictates that hair-nets be re-used all shift long, thus even when workers take them off when leaving production they are required to put the same one back on again when they return, even if inside out and hair that was clinging to the "inside" of the hair net is now free to fall into our food products.
As the Quality Assurance Manager (replace with your title, that was an example) I have had numerous fights with management with regards to this but unfortunately my hands are tied and this practice will continue until Senior Managers (put their names here) change the policy.
Thus, once again sorry for the hair in your food.
---- be sure to send a copy of this to your senior managers - they will of course begin the screaming and threatening to fire you - however this exact thing was used by one of our clients to drive it home and get changes made to insane policies.