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ID number:138033
 
Author:
Evaluation:
Published: 16.09.2014.
Language: Latvian
Level: Secondary school
Literature: n/a
References: Not used
Extract

Papīrs un kartons
Papīru un kartonu ražo no celulozes, uz kustīga sieta izgulsnējot šķidrās suspensijas sastāvā esošās šķiedras un pildvielas. Siets atdala ūdeni no celulozes masas. Mitrajā papīrā palikušo ūdeni atdala presējot un pēc tam žāvējot, tam izmantojot uzsildītus cilindrus ar tukšu vidu. Lai piešķirtu papīram noteiktas īpašības, tam pievieno ķīmiskas piedevas, piemēram, lai piešķirtu krāsu.

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