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What does 'dual injected' mean?

post #1 of 4
Thread Starter 
Paging SmallZooKeeper! I often read this -- "The shell is also dual injected for separation of flex and fit" -- in the description of a boot.

I think it has something to do with how the material, PU in this case,(PolyUrethane?), flexs at room temp and at lower temps on the snow. But that sounds line a simplified marketing response. Details anyone, why is this significant and what does it get you above and beyond typical mouding of plastic?
post #2 of 4
It is when a boot mfg uses two different types of plastic (or durometers), when molding a boot shell. It allows the boot compamy to change how/where a boot flexes. This is rarley used on the high end race boots ie. Diablo Pro Race, Dobie, etc.
post #3 of 4
Within the suitcase part of the mould 'plates' are added, the harder marerial is injected first, the suitcase opened and the 'plate' removed. A second softer material is then added. This is a 'Bi-Injection' Process and in some instances can become a 'Tri-injection'. The reasons this is done are outlined above but also include; material costs, asthetics, temperature resistance and model selection.
post #4 of 4
In other words in terms of fit and performance ignore it. In terms of putting it on may be helpful. But so is the hotgear bag.
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EpicSki › The Barking Bear Forums › On the Snow (Skiing Forums) › Ask the Boot Guys › What does 'dual injected' mean?