Melt Front Temperture

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Melt Front Temperture

Melt front temperature result shows the recorded temperature value of the plastic melt at the instant that it reaches the given point. Note that the temperature values shown in this result are not necessarily in the same time step.

 

From Melt Front Temperature, you can identify the following injection molding problems.

 

Weld line

First identify the possible location of the weld lines from Melt Front Time result. Then examine the melt front temperature near the area. The lower the melt front temperature, the more noticeable the weld lines.

The general solutions to the weld lines are described in the Melt Front Time result adviser.

 

Flow Mark

Flow mark is the surface defect that appears on the finished part near the gate. The defect is usually in the shape of ripple.

The cause of the flow mark is the low temperature of the material. The plastic melt will start to solidify while being injected into the cavity. It is the partially solidified material that produces the flow mark on the surface.

To check if there could be any flow marks, look for low melt front temperature in the runner and near the gate.

 

You can eliminate the flow mark by following methods:

Add cold slug well in the runner system to prevent cold material from entering the cavity.

Increase melt and mold temperature.

Decrease the diameter of the runner to increase frictional heating.

 

Hesitation

Hesitation is the condition where the flow significantly slows down along a particular path. You can first use Melt Front Time result to identify hesitation problem. Then incorporate it with Melt Front Temperature result to check if the cause of the hesitation is the low temperature of plastic melt.

The general solutions to the hesitation problem are described in the Melt Front Time result adviser.

 

 

Material Degradation due to High Temperature

Material degradation occurs when the melt temperature exceed the temperature range that the material can retain its integrity of the polymer structure