Abstract
This paper presents the rotational molding process. The general principles of this polymer processing technology have been described. The main applications have been introduced and leading advantages and typical disadvantages of rotational molding process have been discussed. Based on the conducted experimental tests, the influ ence of changing one selected technological parameter, which characterized rotational molding process, on selected geometrical features of the polymer cast has been determined. Rotational mold’s speed around axes was changed and a thickness of cast walls has been measured. Laboratory test stand, processing properties of polymer, also test program and experimental test methodology have been described.
Highlights
The technological process of polymer molding can be divided into normal and rotational molding as well as slush molding and casting [3, 6]
The present paper describes the experimental tests undertaken to examine the influence of rotational speeds of two axes of the mold on wall thickness of casts produced in the rotational molding process
It should be noticed that such a solution is not optimum – the wall thickness is partially uniform near the journal bearings where the thermal centres occur, yet the thickness of the other walls is decreased because the melt polymer is affected by the centrifugal forces of varying values, which results from a difference between the main axis speed and auxiliary axis speed
Summary
The technological process of polymer molding can be divided into normal and rotational molding as well as slush molding and casting [3, 6]. Adequate technological parameters for the rotational molding process, such as an appropriate ratio of rotational speed around the main axis and auxiliary one, is fundamental to produce casts with the required wall thickness. To determine the influence of the ratio between main axis speed and auxiliary axis speed of the mold in rotational molding on wall thickness of produced casts, experimental tests were performed using a laboratory machine for rotational molding available in the Department of Polymer Processing at Lublin University of Technology. The control and regulation system ensures that the rotational speed of the mold around the main and auxiliary axes can be changed; the system allows for adjusting and stabilizing temperature inside the heating chamber (using resistance heaters and thermostats) [9]. After checking if the bottom head was installed accurately, the mold was
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