Injection molding machines use a processing method in mass production of plastic parts with complex shapes of all sizes. The advantages are fast production speed, high efficiency, automatic operation, variety of colors, shapes from simple to complex, the size can be from large to small, and the size of the injection molded part is accurate, the product is easy to be replaced, and parts with complex shape can be molded.
Plastic injection molding presses are classified or rated based on tonnage, or more specifically the clamping pressure or force. The “tonnage” is the measure of force that is required to keep the tool closed during the injection process. This force is the main factor in determining the injection molding machine size required for producing the part. Smaller presses have tie bar spacing too narrow to accommodate larger products. Lower tonnage machines such as 10 to 100 Ton injection molding machines are great for smaller plastic parts such as those used in medical devices and can also accommodate a wide variety of parts in the aforementioned industries as well.
Most injection molding machines will recommend 2.5 times the surface square inches of the part and an additional 10% as a safety factor. If you have a part that is 120 square inches, you would need a press size with 300 tons of pressure. When you add the 10% safety factor, the required press size would have 330 tons of clamping force.
For more information on Injection molding Machines or other machines you might need please see our article about What Type of Plastics and Metal Machinery do I Need?
Interested in Blow Molding Machines? Then get more information at What are Blow molding Machines?
Interested in Extrusion Machines? Then get more information at What are Extrusion Molding Machines?