The reference book of extruder is, of course, Twin-screw Extruder and Its Application, written by Professor Geng, the best old professor in the field of extruder in China (I dare not say it is the first, but it should also be the top three). The first reference of all related papers must be this book, which is comprehensive and thorough.
I was in his old man's lab when I was a master.
Blue hardcover books are hard to buy. I went to the publishing house warehouse. ...
If you want to read a foreign language, you should read Roberto Colombo in Italy. The introduction is more comprehensive, because he invented the co-rotating twin-screw extruder ... but they are all very old books and hard to find. You can go to the library.
Mi (short for meter) L.BOOY's books in 1978 were all good.
Also, at present, Gngos Costas's books are the best English literature.