Plastic is a versatile material that is often manipulated into the most unnatural shapes. These shapes become toys, household tools and decor, manufacturing components and even automotive parts. Manufacturers create the many shapes using a technique called moulding. One of the most efficient moulding methods is blow moulding.
Other Types of Molding
To mould plastic, you must melt it and then somehow place it into a mould. Injection moulding involves squirting the plastic in, while casting is pouring the plastic into a mould. Blow moulding is like injection moulding as the plastic is squirted into the mould. But, the plastic is followed by an injection of air that pushes the plastic to the insides of the mould, according to Pennsylvania State University's Engineering Science and Mechanics Department. The liquid plastic keeps expanding until it covers the interior walls of the mould.
Less Expensive than Other Methods
According to Proven Technology Inc., an industrial blow moulding equipment consulting service, the blow moulding technique is the least expensive of the plastic moulding methods. It uses the least amount of plastic and results is little waste. The moulds used for blow moulding are also less expensive than other injection moulding parts, according to Partner in Plastics, a manufacturer that uses blow moulding techniques.
The blow moulding method creates a very thin plastic product. The air injection also forces plastic material into all crevices that the mould has. These two traits make blow moulding the best technique for creating complex shapes that are irregular and hollow. Proven Technologies also states that blow moulding allows for a double wall within plastic products, increasing strength in the oddest shapes.
The extremely thin plastic dries faster than cast moulded and even other injection moulded products. There is simply less material to dry. The injection is also quick because of the small amount of plastic used compared to other moulding methods.