I think #2 and #4 are the best of this series. #2 needs a touch more contrast and a bit of noise reduction in the OOF/dark background area.
#1 is okay, I think the men should have been positioned in the foreground and get tight on them with the wide angle. This which would have placed more emphasis on the men and less on the plastic due to the perspective of the wide angle.
I have a problem with #3 ... normally I like eye contact with the subject ... except when they are working ... the eye contact while he is cutting the plastic makes this photo more of a posed/model shoot than an industrial documentary.
#4, maybe a bit too much air on the top. I like the use of OOF, (large aperture) objects to frame the subjects. The difference between #4 and #3 is the eye contact.
Gary