In England and the United States, the edge is processed by overlock in such a way that along the edge there are no traces of the base, only the edging thread. Such edging is created on a special overlock, manually or along the jig (the most common is the manual method).
The technology is labor intensive, like any manual labor. And at the same time the geometric dimensions and evenness of the edge depends on the qualifications of the performer and, usually, leaves much to be desired.
Also, the disadvantages of this method of processing the edge, should be attributed to the fact that when using a hot-melt coating, the edging passes on top of the adhesive layer.
So when securing an embroidered product on clothing or uniform, the edges remain loose and, over time, acquire a not very good aesthetic look.
The fabric of the base is chosen any dense.
In Ukraine, the felt is practically not used as the basis. Simply smooth fabric is used. This is due, most likely, with the lack of inexpensive cloth on the market. The fabric of the warp on the edge is removed to the very edge.
With this technology, the edge of the base is slightly visible through the edging, but if the work is done qualitatively and responsibly, then the whole product looks good.
Given that the cost of such processing is much lower than with the edge processed by the overlock.
In our practice, only a few times customers wanted to get embroidered patches with a edge, processed overlock.
Given the complexity, low manufacturability and dependence on the qualification of the operator, we, until we apply this technology.