In one continuous process, on a single machine, it is possible to feed a blank reel of paper in at one end and remove printed, finished envelopes at the other.
The paper is flexographically printed, window patched, folded and glued; all at speeds of up 1000 finished envelopes per minute.
This is a cost-effective method of producing envelopes but because of the complicated set up process it is only suitable for longer runs, and print content suitable for flexo printing.
This route is generally used for bespoke projects. For example: unusual envelope size; window size (or position); or material.
This method of manufacture can also be used for converting (into envelopes) flat sheets printed by litho, which due to the nature of the image, are unsuitable for overprinting. For example: bleeding off all edges or into the window area.
Blank fed production offers scope for many sizes and styles and, importantly, smaller run quantities.
This, litho printed, process is the easiest and most cost-effective method of printed envelope supply. A small range of sizes is stocked by suppliers- as long as you are happy with an envelope made from uncertified virgin fibre and plastic window film! The range of stock envelopes made from recycled paper is narrow.
Overprinting, from one to five colours, can be done with very short lead times.