Rotational molding offers design advantages over other molding processes. With proper design, parts assembled from several pieces can be molded as one part, eliminating high fabrication costs. The process also has inherent design strengths, such as consistent wall thickness and strong outside corners that are virtually stress free. For additional strength, reinforcing ribs can be designed into the part. Along with being designed into the part, they can be added to the mold.
The ability to add prefinished pieces to the mold alone is a large advantage. Metal threads, internal pipes and structures, and even different colored plastics can all be added to the mold prior to the addition of plastic pellets. However, care must be taken to ensure that minimal shrinkage while cooling will not damage the part. This shrinking allows for mild undercuts and negates the need for ejection mechanisms (in most pieces).
In some cases rotational molding can be used as a feasible alternative to blow molding, this is due to the similarity in product outputs, with products such as plastic bottles and cylindrical containers, this is only effective on a smaller scale as it much more costly to blow mold regarding a small output, and with fewer resulting products rotational molding is much cheaper, due to blow molding relying on economies of scale regarding efficiency.
Another advantage lies in the molds themselves. Since they require less tooling, they can be manufactured and put into production much more quickly than other molding processes. This is especially true for complex parts, which may require large amounts of tooling for other molding processes. Rotational molding is also the desired process for short runs and rush deliveries. The molds can be swapped quickly or different colors can be used without purging the mold. With other processes, purging may be required to swap colors.
Due to the uniform thicknesses achieved, large stretched sections are nonexistent, which makes large thin panels possible (although warping may occur). Also, there is little flow of plastic (stretching) but rather a placing of the material within the part. These thin walls also limit cost and production time.
Another cost limiting factor is the amount of material wasted in production. There are no sprues or runners (as in injection molding), no off-cuts (thermoforming), or pinch off scrap (blow molding). What material is wasted, through scrap or failed part testing, can usually be recycled.
Read more about this topic: Rotational Molding, Process: Advantages, Limitations, and Material Requirements
Other articles related to "advantages, advantage":
... For other uses, however, the advantages of the penetron remained ... In the avionics role the penetron had other advantages as well ... This was a major advantage in the avionics role where power budgets were often quite limited, yet the displays were often hit with direct sunlight and ...
... a sustainable avenue in the development of key sites, there are many advantages to using certain sites for redevelopment ... Some of these advantages include the site’s location in many cases, historical sites are often located in the centers of large cities due to the spatial development of a given area ...
... The main advantages of using a superheater are reduced fuel and water consumption but there is a price to pay in increased maintenance costs ... In locomotives used for mineral traffic the advantages seem to have been marginal ...
... The two-fold advantages of these systems are solving the problem of limited training data and tracking the temporal variations of the input data through adaptation ... momentum because of their key promulgated advantages ... Despite these advantages, there are several open issues involved with these systems ...
... A major advantage of C4 is that it can easily be molded into any desired shape ... C4 can be pressed into gaps, cracks, holes and voids in buildings, bridges, equipment or machinery ...
Famous quotes containing the word advantages:
“If we help an educated mans daughter to go to Cambridge are we not forcing her to think not about education but about war?not how she can learn, but how she can fight in order that she might win the same advantages as her brothers?”
—Virginia Woolf (18821941)
“[T]here is no Part of the World where Servants have those Privileges and Advantages as in England: They have no where else such plentiful Diet, large Wages, or indulgent Liberty: There is no place wherein they labour less, and yet where they are so little respectful, more wasteful, more negligent, or where they so frequently change their Masters.”
—Richard Steele (16721729)
“To say that a man is your Friend, means commonly no more than this, that he is not your enemy. Most contemplate only what would be the accidental and trifling advantages of Friendship, as that the Friend can assist in time of need by his substance, or his influence, or his counsel.... Even the utmost goodwill and harmony and practical kindness are not sufficient for Friendship, for Friends do not live in harmony merely, as some say, but in melody.”
—Henry David Thoreau (18171862)