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Kunststoffe international 2018/11

Declaring War on Quench Marks

The Correct Plug Geometry Makes the Wall Thickness More Homogenous

Declaring War on Quench Marks

In addition to the choice of forming process parameters, the design of the pre-stretching plug in particular affects the wall thickness distribution. By directing plastic material into areas where thin spots develop during forming when using only compressed air, the material consumption and therefore weight can be reduced while maintaining a consistent component quality, simultaneously reducing the risk of quench mark formation during production.

Univ.-Prof. Dr.-Ing. Christian Hopmann; Dennis Balcerowiak, M.Sc. RWTH,

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Literature

1 Moser, A.: Nutzung von Prozesswissen beim Thermoformen von Verpackungen. Universität Duisburg-Essen, Dissertation, 2013

2 Hopmann, C.; Michaeli, W.: Einführung in die Kunststoffverarbeitung. Carl Hanser Verlag, München 2017, ISBN: 978-3-446-45355-5

3 Schwarzmann, P.: Typical and Indispensable – Controlling the Wall Thickness Distribution during Thermoforming by Preforming. Kunststoffe international 105 (2015) 4, pp. 38–41

4 Schwarzmann, P.: Thermoformen in der Praxis. Carl Hanser Verlag, München 2016, ISBN: 978-3-446-44403-4

5 Collins, P.; Harkin-Jones, E.; Martin, P.: The Role of Tool/Sheet Contact in Plug-assisted Thermoforming. International Polymer Processing 17 (2002) 4, pp. 361–369

6 Haberstroh, E.; Wirtz, J.: Choosing Plugs – Plugs for Forming Cups. Kunststoffe international 12 (2003) 12, pp. 24–26

7 Martin, P.; Choo, H.; O’Connor, C.: Measurement & Modelling of Slip During Plug-Assisted Thermoforming. Key Engineering Materials 504-506 (2013), pp. 1105–1110

8 McCool, R.; Martin, P.: The Role of Process Parameters in Determining Wall Thickness Distribution in Plug-Assisted Thermoforming. Polymer Engineering and Science 10 (2010) 50, pp. 1923–1934

9 McCool, R.; Martin, P.; Harkin-Jones, E.: Process modelling for control of product wall thickness in thermoforming. Plastics, Rubber and Composites 8 (2006) 35, pp. 340–347

10 O´Connor, C.; Martin, P.; Sweeney, J.; Menary, G.; Cato-Rose, P.; Spencer, P.: Simulation of the plug-assisted thermoforming of polypropylene using a large strain thermally coupled constitutive model. Journal of Materials Processing Technology 213 (2013) 02, pp. 1588–1600

11 N.N.: Hytac Plug assist Materials. URL: http://www.cmtmaterials.eu/materials/hytac-plug-assist-materials/, 2018

12 N.N.: Hytac-W Epoxy Syntactic Foam for Tooling. Datenblatt, CGP Europe SA, Torcy, France, 2018

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Institut für Kunststoffverarbeitung IKV in Industrie und Handwerk an der RWTH Aachen

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International Polymer Processing

International Polymer Processing, the journal of the Polymer Processing Society, is a discussion forum for the world-wide community of engineers and scientists in the field of polymer processing.

The journal covers research and industrial application in the very specific areas of designing polymer products, processes, processing machinery and equipment.


International Polymer Processing


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