Analysis of the preform blowing stage when obtaining a polymeric product using the extrusion blow molding method
| Autor: | Dmytro Sidorov, Elena Kolosova, Aleksandr Kolosov, Tatiana Shabliy |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
polyethylene
Materials science 020209 energy Energy Engineering and Power Technology 02 engineering and technology Molding (process) Deformation (meteorology) Industrial and Manufacturing Engineering chemistry.chemical_compound Viscosity Management of Technology and Innovation lcsh:Technology (General) 0202 electrical engineering electronic engineering information engineering lcsh:Industry Electrical and Electronic Engineering Composite material polymeric preform drawing rate Blow molding chemistry.chemical_classification Applied Mathematics Mechanical Engineering Internal pressure Polymer Polyethylene Computer Science Applications extrusion blow molding chemistry Control and Systems Engineering molding time drawing ratio lcsh:T1-995 lcsh:HD2321-4730.9 High-density polyethylene |
| Zdroj: | Eastern-European Journal of Enterprise Technologies, Vol 2, Iss 1 (92), Pp 14-21 (2018) |
| ISSN: | 1729-4061 1729-3774 |
| DOI: | 10.15587/1729-4061.2018.126015 |
| Popis: | It was shown that the process of blowing a polymer preform has two characteristic stages. We obtained analytical dependences that link geometric parameters (diameter, wall thickness) of a molded polymeric preform and parameters of the finished molded product to technological parameters of the process of extrusion blow molding of a polymeric product (tangential drawing rate, polymer melt viscosity, internal blowing pressure, tangential drawing factor, molding time). The illustrations of modeling different technological modes are presented. Basic calculations were carried out for the modes of internal blowing pressure from 1kPa to 3kPa for a polymeric preform made of high density polyethylene at a temperature of 200°С, with effective viscosity 8,300Pa·s, an average diameter of a polymeric preform of 0.05m, and a thickness of its wall of 5·10–3m. In this case, stage 1 is characterized by moderate modes of deformation and is limited to tangential drawing factor k=2.5. Stage 2 has an intensive character of deformation, which can lead to defects of the molded product. It was shown that one of the ways for preventing defects is to reduce internal pressure when blowing a polymeric preform. In this case, the main factor that limits the rate of blowing a polymeric preform due to an increase in internal blowing pressure is the maximal dimensional diameter of the molded product |
| Databáze: | OpenAIRE |
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