File:Die swell2.svg

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English: Polymer swell after passing narrow spaces

1 – In a zone of small shear stresses (with small deformation), the macromolecules have roughly spherical form of globules to maximize entropy.
2 – When passing narrow spaces (e.g. between calender rolls, extruder dies), the globules lengthen along the flow direction and contract in perpendicular directions.

3 – After passing narrow, limited space, macromolecules regain their original globular form to maximize entropy.


Magyar: Polimerek duzzadása szűk helyen történő áthaladás után

1: Kis nyírású zónában (kis deformációk) a makromolekulák gombolyag alakúak (a maximális entrópiára törekednek).
2: Szűk helyen (pl. kalanderhengerek között, extruder szerszámnyílásán) áthaladva a hidraulikus ellenállás csökkentése érdekében a makromolekulák az áramlás irányában megnyúlnak, erre merőlegesen összenyomódnak.

3: Miután áthaladtak a szűk, korlátozott helyen, a makromolekulák ismét gombolyag alakúak lesznek.


Русский: Усадка полимерных полуфабрикатов после прохождения зазоров

1 – В зоне небольших напрежений сдвига и деформаций макромолекулы имеют приблизительно сферическую форму клубка (для накопления энтропии).
2 – В узких местах (например в зазоре каландра, в профилирующем отверстии червячной машины) макромолекулы ориентируются - клубки удлиняются по направлению течения и сжимаются в перпендикулярных направлениях.

3 –Прошедши узкое место, макромолекулы опять приобретают форму клубка.
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Author kifo

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current12:41, 13 February 2010Thumbnail for version as of 12:41, 13 February 2010800 × 800 (96 KB)Kifo (talk | contribs){{Information |Description={{en|1=Polymer swell after passing narrow spaces 1 – In a zone of small shear stresses (with small deformation), the macromolecules have roughly spherical form of globules to maximize entropy. 2 – When passing narrow spaces

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