Thermoforming is one of the oldest methods of processing plastic materials. These plastic materials are seen in some of the common things that we use in our daily lives. Right from the toothpaste tube from which we start our day to our breakfast trays all are made up by this process. However, their application is not limited to simple household things and even extends to high impact materials such as aircraft cockpit covers. It is also used to produce design prototypes of products formed by other processes.
If explained in simple terms, thermoforming is heating of plastic sheet draped over a mold while vacuum is applied to it. The mold is allowed to cool first and then with the help of reverse pressure facility, it is ejected from the mold. Thermoforming includes all the processes to shape polymers by heating objects including the Vacuum Forming Process. Vacuum forming machine is used to form objects into different shapes and sizes with the help of heat and vacuum. There are many Vacuum Forming Machines that are available ranging from small to manual to fully automatic.
How it works?The sheet is fixed on a heat proof air- tight seal.
The heater system begins heating by moving under or over the sheet.
The vacuum pump is energized once the sheet reaches its thermoforming temperature.
The heater moves back to its original position or the sheet moves from heating to the molding position.
The sheet moves and drapes over the mold mounted on a moving platen.
After the platen reaches its top stroke, an airtight pocket is formed by the underside of the sheet and moldâEUR(TM)s upper surface. This air tight pocket is then connected to the vacuum pump which sucks out the air that is preventing the atmospheric pressure from pushing the sheet down the mold.
The sheet contracts after cooling gripping the mold. In the next step the airflow is reversed. Using air pressure, the sheet is prevented from sticking on the mold.
Vacuum blowers are continued till the sheet is once more rigid. After that, the vacuum is switched off and the mold is lowered to release the forming.Om Chamunda Enterprises is one of the reputed manufacturers and exporters of Industrial Packaging Machinery. It offering includes Vacuum Forming Machine, Granule Filling Machine, Pouch Packaging Machine, Capsule Filling Machine, Cup Sealing Machine Blister Cutting Machine and much more. All its products are made from best quality raw materials ensuring their durability and performance. It is also counted amongst the leading Industrial Packaging Machinery Manufacturers in India.
