As the main method of forming composite material preform

the sticthing technique has been widely applied in areaspace. There are three different ways of stitching including Tufting

chained stitching and locking-type stitching. Different stitching ways had different effects on the permeability and compressibility of stitched preform. Meanwhile the different stitching parameters such as stitch pitch and stitch spacing also had different effects on the permeability and compressibility of stitched preform. In this article

the effects of three different stitching ways including Tufting

chained stitching and locking-type stitching

as well as different stitch pitch and stitch spacing on the permeability and compressibility of stitched preform were studied and compared by experiments. The test results show that the permeability of stitched preform is greater than that of non stitched fabric

and chained stitching locking-type stitching Tufting. The permeability of chained type preform increases significantly with the increase of stitch pitch

the permeability of the Tufting preform decreases with the increase of stitch spacing; The relationship between compressibility of stitched preform is as follows: Tufting chained stitching non stitched; The compressibility of chained type preform increases with the increase of stitch density; The compressibility of Tufting preform decreases with the increase of stitch pitch.