Processes for the Construction and Transfer of Patterns

The easiest process for the construction of patterns is the manual laying of pattern stencils. More economical is pattern production with small stencils. First the pattern is made to a scale of 1 5. The reduction of the complete pattern facilitates a better overview of the achieved fabric utilization factor. Then the achievable pattern can be photographed and again enlarged photographically to its original scale. 

State-of-the-art pattern production uses computer-aided design (CAD) with a video workstation that generates the pattern fully automatically. With this interactive image processing, production can be optimized further. This process reaches fabric utilization factors of more than 90%. 

Patterns in the manual or semiautomated cutting are transferred by brushing or copying on an intermediate medium such as fabrics, foils, or papers. Then the pattern is fixed on the textile fabric. If the computer-aided pattern production is connected to an automatic cutting unit, it is possible to transfer the pattern coordinates directly to the cutter head. The intermediate medium can be omitted. 

Cropping or cutting with blades uses physical effects of mechanical separation processes. Easy-to-use cutting machines that work according to the cropping principle are normally done cutting with blades with a counter edge. 

Straight-knife cloth cutters are used for the cutting of ply packs with smaller sizes (rough cut). An endless knife moves up and down to cut the fabric. 

---