We are a small business that manually produces several thousand sandwiches on a conveyor belt every day. The conveyor has a line of people all putting their ingredient onto the sandwich as it goes past. We can make between 1 - 200 (yes, we do make as few as 1 sandwich to meet an order) of each variety of sandwich so need the ability to change over ingredients very quickly.
Currently we use 1 litre squeeze/sauce bottles to apply mayonnaise, caesar dressing, thousand island dressing, honey mustard, etc, etc onto the sandwich. They are a soft plastic so that they can be squeezed.
I want to be able to label the bottles with what is in them and when it was filled however I can't think of a safe way of doing this. Sticky labels will fall off (probably into the sandwich), permanent markers will not stay permanent given the quantity of alcohol based hand sanitiser that is used. The plastic is too thin to engrave. Does anyone have any ideas that aren't stupidly expensive?
I'm also wondering if there is another type of "dispenser" that would be more suitable - one which will dispense a consistent amount with minimal wastage, but is cheap, small/portable (like the bottles), easy to clean? We have quite a few different flavours of sauces/dressing and change over multiple times every day (and it would need the ability to identify what is in it).
Anyone have any experiences or ideas they can share?