DIE ORIFICE DIES MOULD #1

Tooling (Dies and Molds)

There are some applications, particularly in using diverging angles in the die and

mandrel to make larger products, when it is more convenient to shape the mandrel

than to shape the die. There are still other applications in which it is necessary to

shape both the die and mandrel.

Die Orifice

Another important characteristic is the effect of the orifice shape on the

melt. It is related to the melt condition and the die design, with a

slow cooling rate having a significant influence, especially in thick products. Cooling

is more rapid at the corners; in fact, a hot center section could cause a product to blow

outward and=or include visible or invisible vacuum bubbles.

Other factors are considered, such as the angle or taper of entry and the parallel length

of the die land. For most thermoplastics (TPs), the entry angle must be as small as

possible to ensure good product quality, particularly at high output rates. The abrupt

changes in the direction of melt flow tend to cause rough or wavy surfaces and

principally internal flaws; the condition is called melt fracture.

The approach used for shaping cavities in the dies is important, requiring threedimensional

(3D) evaluation that includes streamlining. Where possible, all dies

should be designed to promote streamlined melt flow and avoid the obvious pitfalls

associated with the areas that could cause stagnation: right angle bends, sharp

corners, and sections in which flow velocities are diminished and are not conducive

to streamlined flow.

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