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Selected aspects of virtual prototyping the blowing preform process in the ansys-polyflow software

Pepliński K.

Journal of Polish CIMAC

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2013

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Vol. 8, no 3

69--73

EN

Technological processes of blowing the polymer preform occupy a prominent position among the widely understood blowing technology side extrusion blow molding or direct injection blow molding. Efficient design of a structural preform for a specific final polymer product needs to give its geometric form suitable thickness distribution in the different peripheral sites under consideration of the preform and the appropriate temperature field adapted to the blow ratio and the final geometry of the product or user requirements. Often it is a time consuming task in the absence of adequate knowledge about the blowing process phenomenality in general-purpose software Ansys–Polyflow. This may result in the occurrence of different errors in the numerical calculations. In a virtual design of Polyflow environment is possible to check whether a particular geometry application specific blowing preform parameters and their impact on the final form of a product.

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Simulation of blowing perform and optimization their thickness distribution for final target shape of in container

Pepliński K., Kubielski A.

Journal of Polish CIMAC

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2012

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Vol. 7, no 3

225-230

EN

Injection blow molding is a manufacturing process widely used to produce thin thermoplastic parts and it is best suited to smaller containers ranging in capacity from 1 ml to about 1.5 liters, typically for medical, pharmaceutical, and personal care application [3]. In this paper was presented numerical simulation of the inflation phase of an injection blow molding process under which a polymer preform is deformed into a mould under the action of applied pressure. Two cases of blowing preform were considered: for blowing pressure 4MPa and 2MPa. Simulation starts with constant thickness preform geometry. There has been excessive difference of thickness distribution (about 0,6;1,6mm) in the bottle after forming. On this basis, was made optimization of the preform profile geometry to remove thickness differences. It was assumption one optimization step to obtain final thickness distribution about 0.3mm and next to optimization steps to obtain hypothetical thickness about 0.1 mm. Noted was a significant effect of the initial preform thickness distribution on the final desirable wall thickness distribution (0.3 mm or 0.1mm) in the considered container. The Ansys Polyflow procedure of optimizing the preform thickness distribution allowed eliminating excessive differences in injection blow molding container.

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Ansys polyflow software use to optimize the sheet thickness distribution in thermoforming process

Pepliński K., Mozer A.

Journal of Polish CIMAC

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2011

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Vol. 6, no 3

215-220

EN

Thermoforming is a manufacturing process widely used to produce thin thermoplastic parts from small blister packs to display AAA size batteries to large skylights and aircraft interior panels. In this paper was presented numerical simulation of the inflation phase of a thermoforming process under which a thin polymer sheet is deformed into a mould under the action of applied pressure. Two cases of blowing sheet were considered. In the first, preapproved on the basis of a constant sheet temperature (T = 150°C) examined the distribution of the container wall thickness. There has been excessive thinning (about 0,2mm) in the cup corners after forming. Also simulation it was made for other constant temperature (160, 170, 180, 190 and 200°C). On this basis, was made optimization of the sheet profile temperature (in range 150÷200°C) to remove excessive thinning. Noted was a significant effect of the initial sheet temperature distribution on the final wall thickness distribution in the considered container. The Ansys Polyflow procedure of optimizing the sheet temperature distribution allowed eliminating excessive thinning in the considered cup walls corners.