Polyflow Software Use To Optimize The Parison Thickness In Blowing Extrusion

The blowing extrusion is one of the most widely used techniques for the production of hollow plastic products. In order to improve the efficiency of designing plastics processing the blow products from thermoplastic materials used in Computer Aided Engineering software. This paper presents the blowing container simulation with high-density polyethylene (Borealis, BS 2541), using Polyflow software. In the present work was showed the impact of the initial parison geometry distribution onto final wall thickness in the sample container. Two cases of blowing parison were considered. In the first, pre-approved on the basis of a constant parison thickness (g = 2 mm) examined the distribution of the container wall thickness. There has been excessive thinning (between 0,2÷0,3 mm) in the container corners after blowing. On this basis, was made optimization of the parison profile thickness to remove excessive thinning. Noted was a significant effect of the initial extruded parison geometry on the final wall thickness distribution in the considered container. Optimizing the parison profile thickness allowed to eliminate excessive thinning in the corners of container walls. The minimum wall thickness was only 0,9 mm, assuming the final wall thickness of the container to obtain the order of 1mm.