'use of extruders for the production of protein fibers and for the production of cheese analogues through a emulsification-gelation process. For both processes, a twin screw extruder connected with a slit die was used.' What will be the flow pattern inside the slit die? Will the flow profile change upon cooling? Try to draw the flow profile at various positions in the die.
Here, the final answer is not known. In case the material behaves like a liquid, the parabolic flow pattern will be formed. In case of a solid material, a flat flow pattern will arise. However, it is not clear whether a transition from liquid to solid is possible and how the transition should look like. A possible reasoning is that the material behaves solid like through the complete die. In that situation though, it is not clear how the die can contribute to the formation of a structure.