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Introduction to Rotational Molding 9 in the past, rotational molders did not discourage this opinion. This situa- tion is now changing and the Association of Rotational Molders (ARM) formed in 1976 has been instrumental in acting as the focal point for many important advances in the industry. A number of other similar organiza- tions have also been set up in Europe and Australasia. Traditionally this sector has been dominated by small companies, which by their nature must focus on their own short-term needs. ARM has acted as a voice for the industry, providing opportunities to pool resources to fund R & D, and to promote the industry. These efforts have undoubtedly helped rotational molding to become the fastest growing sector of the plastics processing industry. In 2000, the Society of Plastics Engineers (SPE) chartered the Rotational Molding Division in order to promote greater technical discus- sions about the process. This will result in a larger number of academic institutions taking an interest in the process, which has to be good for the future advancement of rotational molding. 1.4 Advantages and Disadvantages The main attractions of rotational molding are: ! A hollow part can be made in one piece with no weld lines or joints ! The end product is essentially stress-free ! The molds are relatively inexpensive ! The lead time for the manufacture of a mold is relatively short ! Short production runs can be economically viable ! There is no material wastage in that the full charge of material is normally consumed in making the part ! It is possible to make multilayer products ! Different types of product can be molded together on the one machine ! Inserts are relatively easy to mold in ! High quality graphics can be molded in The main disadvantages of rotational molding are: ! The manufacturing times are long ! The choice of molding materials is limited ! The material costs are relatively high due to the need for special additive packages and the fact that the material must be ground to a fine powder ! Some geometrical features (such as ribs) are difficult to moldPDF Image | INTRODUCTION TO ROTATIONAL MOLDING 1
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