Computer simulation of the load test of an extrusion blow moulded product

Michał Modławski,Jacek Nabiałek,Tomasz Jaruga,M Vasko,O Štalmach,P Kopas,V Baniari,L Jakubovičová,M Handrik,M Blatnická,M Sága,A Sapietová

doi:10.1051/matecconf/201815701012

Abstract

The results of compression "top load" test of an extrusion blow moulded container, performed in ANSYS Mechanical software, were presented. The non-uniform wall thickness of the blown product was considered because the thickness distribution was the result of the first step of the simulation in ANSYS Polyflow - the simulation of the product manufacturing by extrusion blow moulding. The hydrostatic pressure factor was taken into account during the "top load" simulation, because such a test is usually done for filled products. It was found that the biggest stress values occur around the inlet as well as in the side walls of the container.

Highlights

Extrusion blow moulding technology is used for many years, but because of the growing demand on plastics packagings in the last years this process is developing fastly, which is remarkable by increasing number of machines working in the industry and by increasing the technological innovations [1]
The computer simulation gives an useful information about the processing parameters efficiency which is important while designing a product and a mould, that means before taking the costs of building a tool
The numerical simulation results of the load test were: stress distribution and ready product deformation, computed for two cases: canister loaded by a vertical force equal 100 N, canister loaded by a vertical force equal 100 N and the internal walls loaded by hydrostatic pressure resulting from filling the container by a liquid

Summary

Introduction

Extrusion blow moulding technology is used for many years, but because of the growing demand on plastics packagings in the last years this process is developing fastly, which is remarkable by increasing number of machines working in the industry and by increasing the technological innovations [1]. The simulation of injection moulding process is widespread today, the simulation of blow moulding is still not used so much The results of this simulation could contribute to the improvement in new products development thanks to the possibility of design modification at the product design stage. Not all quality factors can be simulated nowadays – for example the surface roughness of a product and the degree of cavity mapping These factors are an important quality indicators and they highly depend on processing parameters [11]. A canister-type container is one of typical extrusion blow moulded products This product is specific due to its cubicoidal shape which makes the risk to thin the wall significantly in the corners during the moulding process as well as due to the handle used for carrying, and being problematic during moulding [12,13]

Simulation research

The project of the canister

Results of computer simulation of the load

Conclusions