One can find plastic objects anywhere in their daily lives. Be it you, we, or anyone else. However, if you are curious to get into the manufacturing of the same, you can read this blog ahead. Today, we are sincerely explaining plastic forming processes. Some of them are quite common for industry experts. If you are planning to be one of them, this blog is for you.
Plastic Injection Molding
You can hold this method accountable for producing about 80 percent of the plastic we use in our daily lives. The Injection Molding process actually makes full use of aluminum or steel molds.
The mold has two sides: the core and the cavity, which are installed inside the plastic injection molding (PIM) machine. The machine melts plastic pellets until they reach a molten state. The molten plastic is then injected into the cavity under high pressure, ensuring it fills every detail of the mold accurately.
Once the plastic has cooled and solidified, the machine opens, and the finished part is ejected. This precise and repeatable process makes injection molding ideal for custom plastic parts manufacturing, where consistent quality and tight tolerances are essential across high production volumes.
Its ability to produce identical plastic components in large quantities makes injection molding one of the most widely used plastic forming processes in modern manufacturing. Depending on the application, manufacturers may also offer design support, material selection, prototyping, and secondary services such as assembly or finishing to meet specific production requirements.
Molds are costly, particularly for parts with complex geometries. Careful engineering, tooling design, and quality control are essential to minimise defects, optimise production efficiency, and ensure each molded part meets the required performance and dimensional standards.
Extrusion Blow Molding
This process is useful to make inexpensive containers like disposable bottles, cups, can, or anything similar. These containers have thin walls. The process under the extrusion blow molding is easy and fast. But keep in mind not to make the part geometry complicated.
Also, it’s not the best manufacturing process when you need parts to have a high precision percentage.
Injection Blow Molding
Amongst other plastic forming processes available today, this process is best for using gas pressure to inject the molten resin into the cavity. This process can be controlled easily and repeated for bulk orders.
The best application of this method is for the manufacturing of transparent plastic water bottles. The process renders the product with excellent surface quality. But it would be equally poor for the items that would have thin walls.
PET or PEEK are usually the resins used for manufacturing transparent water bottles. These two resins are ideal because of their durability and clarity. Moreover, these resins help in making recyclable plastic water bottles.
Vacuum Casting
This process is chosen for the products to be produced in small numbers but with high quality. And you won’t need bigger investments or materials to manufacture rapid prototypes under this method.
You will choose a master model of a solid. Then place it into a sealed or enclosed box brimmed with flexible silicone or urethane. After that, you remove the master, leaving the scope for the formation of a cavity inside the mold.
Later on, you can inject resin inside this mold for making a prototype or a copy of the original product. Then, vacuum pressure is useful here to draw out any air bubbles, letting the resin settle inside the mold perfectly.
The mold is best to make 15-20 prototypes at a stretch. After that, the mold will degenerate.
Thermoforming
This is another form of vacuum forming. The expert engineer (which can also be you if you’re manufacturing the same) places a thick/thin gauge plastic sheet under the chosen die.
This die is hot and heated up to a certain temperature to make the material pliable. The pliable material or gauge sheet spreads over the die surface. Then, expert manufacturers, such as New Plastics Plus, use vacuum air pressure to draw out the sheet to finalize the material’s shape.
This process requires very basic equipment like a die, heating tools, and the material to heat over the surface. Its application is mostly for manufacturing cups, plastic clamshell packaging, lids, and boxes.
Rotational Molding
The rotational molding method also has the use of core and cavity. But it’s still slightly different.
Experts pour the plastic powder inside the mold cavity. They then place it in an oven. As the mold heats, it rotates on two axes. With gravity, the plastic starts to stick to the mold walls to form a better and thicker shape.
After that, we remove the mold from the oven and let it cool down. It might take about a few minutes, maybe around 15-20 minutes, for the mold to come back to room temperature.
Only after that, the part from the mold’s cavity is taken to another cycle.