CLICK HERE FOR INDEX PAGE | ||
ROTATIONAL MOULDING | ||
V.Ryan 2017-2021 | ||
Rotational Moulding - Box Learning Exercise (Independent Learning) | ||
Rotational moulding is a process that is ideal for the moulding of hollow products. These include tanks holding liquids, flower pots, rainwater tanks, footballs, road cones, fenders, luggage trays. Polyethylene and Polypropylene are ideal polymers for this moulding process. It is particularly suitable for the manufacture of batches from 100 to 5000 units. | ||
Rotational moulding is a four stage process. 2. The mould moves to the next stage, where it is heated to 300oC. At the same time the mould rotates so that the powder is forced against the wall of the mould. 3. The mould moves onto the cooling stage. Cool air is blown around the mould, aided by large fans. The mould cools slowly and solidifies. 4. The finished product is then removed. |
||
ADVANTAGES: It is a profitable process even when manufacturing 100 units. |
||
STAGE BY STAGE EXPLANATION | ||
1 MOULD FILLED WITH MOULD FILLED WITH THE CORRECT WEIGHT OF POLYETHYLENE / POLYPROPYLENE
|
2 HEAT 300 DEGREES CENTIGRADE
THE MOULD IS HEATED TO 300oC AND ROTATED, FORCING THE POWDER AGAINST THE SIDES OF THE MOULD |
|
3 COOLING STATION THE MOULD IS COOLED AND THE CONTENTS OF THE MOULD COOLS DOWN SLOWLY
|
4 MOULDED PRODUCT REMOVED THE FINAL PRODUCT IS REMOVED FROM THE MOULD AND THE ROTATIONAL MOULDING PROCESS STARTS AGAIN
|
|
ROTATIONAL MOULDING IN INDUSTRY | ||
ROTATIONAL MOULDING - QUICK SKETCH DIAGRAM | ||
In an examination, if asked about rotational moulding, it is important that you can sketch quickly. Basic clear sketches can be drawn using a pencil or even a fine black pen. Leave out unnecessary detail and only include colour / shade, if it is really necessary. The colour added below, identifies the heated stage and the moulded shape. |
||
CLICK HERE FOR EQUIPMENT AND PROCESSES INDEX PAGE | ||
CLICK HERE FOR RESISTANT MATERIALS INDEX PAGE | ||
|