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ID number:896886
 
Evaluation:
Published: 04.06.2012.
Language: Latvian
Level: Secondary school
Literature: 1 units
References: Not used
Extract

Papīru ražo no celulozes pulpas (masas), kurai pievieno pigmentus un pildvielas. Izejmateriāls celulozei ir koksne. Lai saražotu 1 tonnu celulozes masas, nepieciešamas 3,5 tonnas koksnes, savukārt viena tonna makulatūras pasargā no nociršanas apm. sešus kokus. Atkārtoti pārstrādājot papīru, ietaupām koksni. Ietaupām arī enerģiju, jo , lai saražotu vienu tonnu pirmreizējā papīra, vajag 30 900 MJ (mega joli) enerģijas, kamēr tādam pašam daudzumam papīra, kurš iegūts no makulatūras, vajag tikai 18 100 MJ: 1 tonnas papīra iegūšanai jānocērt 14 lieli koki, kas auguši 60 gadus.…

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