In this case the shape is determined directly by the shape of the layers, obtained through the variable courses technique. The technique is based on knitting on only a part of the needles producing the layer, in certain rows, while the others are missing. One example (knitting programme, Sirix) is presented in Fig. 29.
The fabric cross section given by the connecting layers is controlled through these layers. Different shapes can be therefore produced, as exemplified in Fig. 30. The layers are emphasised in red, while the separate fabrics are lined; the arrows are indicating the knitting direction. Two main types of shaped layers can be identified: with integral shape (the yarn guide is feeding continuously, even if on only a variable number of needles), as in Fig. 30.a. and b. and with divided shape (the evolution is split on distinct groups of needles, requiring separate feeding), as in the case of the fabric presented in Fig. 30.c.
Sandwich fabrics with fashioned exterior fabric
The fully-fashioning of the separate fabrics is obtained by narrowing and enlargement technique the number of working needles of the fabrics, using stitch transfer and racking. Fig. 31 illustrates one such possibility.
Fig. 31. Sandwich fabric with fashioned exterior fabrics