Casting off is a method by which you can create an edge which will not ravel. In knitting cast offs has great importance, it is because of this technique that, our sweaters and other knitted objects do not destroyed. This is basically the final stitch that gives your project strength.
The basic technique of knitting casting off involves, passing the final loop of a wale, over the loop of an adjoining stitch. You can create variations in this technique to create simple casting off, knit casting off, purl casting off; sewn cast offs and so on. These different types of casting offs can be used to provide strength, durability and comfort along with quality to your project.
In simple knitting cast offs, a loop is passed over the adjoining stitch; here the yarn is passed through the final loop, to fasten everything in place. This method produces a tight edge with a little elasticity. Unlike other casting offs, the bounds do not undo due to tension. Hence this technique is used in shoulder seams. Another convenient thing of this bounding is that it does not need a knitting yarn nearby and can be done in any direction.
Another version of the simple knitting cast offs in the knit cast off. Here every loop is knitted before passing over the other loop. You have to start with knitting two normal stitches and then pulling the first stitch on the right needle over the second the stitch.
Knit the next needle on the left needles and continue till the end with this cycle. You can make your casting offs loose or tight by applying the appropriate tension. To create loose cast offs use a needle that is two sizes bigger than the required project needle.