In particular, we objected to the passages in paragraphs [0038] and [0042] which would still stand in contradiction to the subject-matter of this claim as those passages still include the angle range from 10゜ to 30゜ is varied “ so as to become gradually smaller toward the side of the outlet 3B”. This would stand in contradiction of the teaching of the claim, where the angle shall be set to 13゜ to 14゜ throughout the whole length of the screw section.