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What Is The Injection Molding Clamping Pressure?
Original: | Author: Jasmine HL of DGMF | Publish Time: 2020-02-24 | 9786 Views | Share:
The clamping pressure is a measurement of the force needed to hold the mold closed during the injection. Clamping force refers to the force applied to mold by the clamping unit of an injection molding machine. In order to keep the mold closed, this force must oppose the separating force, caused by the injection of molten plastic into the mold.

Why the clamping pressure is important in production?
In a production environment, it makes the most sense to use a machine that can withstand the maximum clamping pressure but not much more. Machines larger than necessary represent a waste of valuable capacity that can potentially be used on bigger projects, and of course, the extra power consumption and other factors are wasteful as well.
Therefore one of the first things a molding engineer should be taught is to design for the smallest machine possible. This requires understanding how to calculate the necessary tonnage as the first step.
Normally, the force rating is stated in tons, e.g. a 200-ton machine is capable of producing a maximum clamping force equivalent to a total of 200 tons. The calculated tonnage can be used to select a capable machine that will prevent part defects, such as excessive flash. So how much clamp force is required?
The required clamping force can be calculated from the cavity pressure inside the mold and the shot projected area, on which this pressure is acting.