Die drawing is an important solid phase processing route for significant enhancement properties of polymers. However, there has been little detailed characterisation of the mechanisms of structure development during this process; the main characterisation has been on final products, particularly their enhanced physical properties. In-situ microbeam, time-resolved small and wide angle x-ray studies of solid phase orientation of polymers have been undertaken for the first time by our team (including our Joint International Laboratories in China), using a purpose-built die drawing rig designed and built in Bradford, and used in both the Changchun Xenocs precision x-ray installation, and in the Shanghai high precision beam line. Solid phase orientation of polyolefins, mainly isotactic PP, by die drawing is shown to lead to different crystal domain effects than free drawing, forming what appears to be a more stable structure. In associated studies in Sichuan and Bradford, modification of PLAs with long chain branching to enhance their processability in die drawing, is shown to be an effective route for the manufacture of enhanced property products.