Time to read the article: 5 minutes
Moulding is an all-purpose industry which is used to produce different types of plastic parts. These days, modern moulding industries are producing a variety of parts of different size surrounding us. Thanks to moulding industries, all sorts of plastic items ranging from plastic bottles to crucial parts of cars and cell phones can be easily produced. The the process of production of moulds are of high pace and precision and in which the thickness of parts can be adjusted as required.
Familiarizing with Kinds of Moulding
Moulding industry can be categorized into the stone industries. In this industry, first of all, skillful designers design moulds using professional softwares, then they render the final designs to the casting sector. After designing the moulds, all sorts of plastic and metal parts can be produced. All in all, the whole process of making moulds can be divided into two stages of designing and casting.
Moulding has different types. For instance, moulding using casting method, smithery method and the press type.
Casting itself is a popular method for producing moulds and has the following sub-categories:
- Mould-based Method
- Sand- based Method
- Continuous Method
- Precise Method
- Melting Foam Method
Sand-based method is more applicable for producing the parts of different sizes and dimensions and those with high temperature tolerance. Fore examples, metal parts are produced by the sand-based methods to be resistant to high temperatures.
What is the plastic injection moulding and why is it so popular?
The plastic injection moulding is utilized to make different kinds of plastic parts. In this method, first of all, plastic powder moves from the tank to the heating hall and after being fully heated, gets injected into a two-part mould by high pressure. Since the pace and precision of this method is high, it has become so popular and turned into one of the best methods of moulding. After injection process, pars get the forms very fast due to the low temperature of the mould. After cooling process, the final parts are thrown out of the moulding machine.
In this method, the moulds are made of two separated parts. At this point, the two parts of moulds are attached to each other by some pins and retainers. If they are not well attached, the melted plastic might overflow. That is the reason for which the spare parts maintenance and replacement are so crucial in moulding industry.
Wind, Press and Rotational Moulding
Other methods of the parts producing are wind and press moulding. Although plastic injection method is so popular and is frequently used in the moulding industry, wind and press methods are also applicable in this industry.
In the wind method, as you can guess from its name, the wind plays an important role as the melted material enters the moulding chambers and then the wind pressure pushes the material into the mould and after cooling, the parts are shaped as desired.
In the press moulding, the pressure plays the essential role as the flexible soft material is poured into two pieces of mould and are fully pressed to each other. As a result, the parts are shaped favorably in between. This method is appropriate for making stuffed parts. Although it is not as precise as the plastic injection method, but instead is so fast and helps produce great number of parts in a short time.
The rotational method is another moulding method mainly known as the ROTO. In this method, the continuous rotational movements along with heating can bring about the results, as the polymer powder is shaped through consistent rotational moves and heating simultaneously. The advantages of this method are being rather energy saving and fast comparatively.