Page 29 - Roisin McGrath

Filling Heating Cooling Demoulding

Mould heated during Mould cooled while
two-axis rotation still rotating
1. The mould is filled 2. Then, it is 3. While still rotating, 4. Then it is opened
with the polyethylene heated up and the mould is cooled. and the product can

powder. rotated around be removed. I looked at the materials that are used and
so that the
powder melts used this as a background to my form in the
and sticks to the concepts I developed.
mould walls.

Material analysis
I learned about the process of rotational moulding
and made sure that in my concept development Medium density polyethylene (MDPE) is the most
that I kept this in mind for my from. common material that is used for rotational
moulding. Some of its most common uses include
storage bins, water and oil tanks, and kayaks.

Advantages Disadvantages

Weather and crack resistant. Not suitable for very high pressure
applications.
High tensile strength.
It can crack and break under too
Flexibility makes it very suitable for a large much pressure.
range of different industry products.
Good chemical resistance.

Ribs in the walls strengthen the product
even more.
www.entecpolymers.com

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