Glossary entry (derived from question below)
Spanish term or phrase:
rodillos muy unidos
English translation:
set very close to each other
Spanish term
Translator
Native in: Spanish 
Works in: English to Spanish, Spanish to English, Portuguese to Spanish, and 2 more.
rodillos muy unidos
importantes el triturado y la molienda (triturado fino); es decir, el grano obtenido se
hace cada vez más pequeño. Para tal efecto, los granos descascarillados pasan por
una batería de rodillos muy unidos y, después, continúan siendo desmenuzados en
molinos especiales hasta obtenerse una masa fina de color pardo brillante llamada
pasta o licor de cacao.
| 3 +1 | set very close to each other |
Sergio Kot
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| 4 +2 | closely spaced rollers |
Chris Ellison
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| 3 | (battery of rollers) in close proximity to each other |
Wendy Streitparth
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Proposed translations
Israel
Hebrew-English-Spanish-Yiddish-Aramaic
Native in: Hebrew (Variant: Modern / Israeli) , Spanish (Variants: Argentine, Standard-Spain, Rioplatense, Chilean, Latin American, Uruguayan)
Works in: Spanish to Hebrew, English to Hebrew, Hebrew to English, and 3 more.
set very close to each other
...go through a battery of rollers set very close to each other...
https://www.linguee.es/espanol-ingles/traduccion/somos+muy+unidos.html
https://www.linguee.es/espanol-ingles/traduccion/muy+unidos.html
Spain
Geology and environment specialist, PhD
Native in: English 
Works in: Spanish to English, Catalan to English, English
closely spaced rollers
8200 hits on google; only 185 for "rollers set very close to each other".
HTH :-)
| neutral |
Wendy Streitparth
: Is that really good English? Of those hits, a large number appear to be by foreign authors. / OK, but it still sounds strange to my perhaps rather wonky ears!
11 hrs
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I think these are pretty reliable: https://books.google.es/books?isbn=0122004000 and https://books.google.es/books?isbn=1593703139 Both are technical dictionaries by native speakers.
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| agree |
MollyRose
11 hrs
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| agree |
Terence Jeal
15 hrs
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Germany
45 years experience
Native in: English (Variant: British)
Works in: German to English, French to English, Spanish to English, and 2 more.
Discussion
https://en.oxforddictionaries.com/definition/closely
Definition of closely in English: closely. adverb. 1With little or no space or time in between. 'closely spaced homes'.