Why appear skewed in packaging with packing

In the process of packaging with packing why deflection phenomenon? Deflection occurs because what again? Everyone with me to find the answer: take alias strapping tape. Packing straps with polyethylene, polypropylene resin, cold-rolled strip steel as the main raw material, also have with nylon and polyester as the raw material, made by extrusion uniaxial tensile, heat treatment blue are produced. Except for corrugated carton packing banding, hot-rolled coil strapping, strapping, cold rolled steel coils can also be tied, tubes, glass material, fruit, etc. Actually take causing deflection of reason is various, in principle, it is the high polymer material creep phenomenon, that is packaged with molding after winding bundles, due to a horizontal winding stress constant effect, under a certain temperature, molecular chain conformation displacement occurs gradually, rearrangement of molecular chain orientation. But due to friction between molecular chains, not completed instantaneous changes, so the molecular rearrangement or material deformation with time gradually increased, until the formation of the stability of the equilibrium structure, thus occur deformation, formation of skewness. If you pack the deflected through large, automatic packing machine can work continuously, will affect the work efficiency, so you want to attach, found that the problem timely correction.