Black sky by titi fifi https://padlet.com/321fisica/btfqzrx8097h VAes A.S. 2018/19 en-us 2018-11-21 10:05:03 UTC 2025-12-12 03:52:31 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Bigthunderstorm.png antimoboccagna27 https://padlet.com/321fisica/btfqzrx8097h/wish/307133782 New dawn, same disaster]]> 2018-11-22 23:43:48 UTC https://padlet.com/321fisica/btfqzrx8097h/wish/307133782 antimoboccagna27 https://padlet.com/321fisica/btfqzrx8097h/wish/307133855 New dawn, same disaster]]> 2018-11-22 23:44:38 UTC https://padlet.com/321fisica/btfqzrx8097h/wish/307133855 PLASTIC MAP alessiabagarolo626 https://padlet.com/321fisica/btfqzrx8097h/wish/309530616 https://bubbl.us/NDk3OTQ4OS85NTI5NDA1L2UxMGU5MjhmZDY4YTVmMDQxZjRhNjk0ZTY3MGZiNWJl-X?utm_source=shared-link&utm_medium=link&s=9529405]]> 2018-11-29 20:05:59 UTC https://padlet.com/321fisica/btfqzrx8097h/wish/309530616 Plastic Timeline marianopiccolo11 https://padlet.com/321fisica/btfqzrx8097h/wish/313087941 2018-12-10 18:22:58 UTC https://padlet.com/321fisica/btfqzrx8097h/wish/313087941 https://bubbl.us/9546907 marti0188 https://padlet.com/321fisica/btfqzrx8097h/wish/313133046 2018-12-10 19:36:06 UTC https://padlet.com/321fisica/btfqzrx8097h/wish/313133046 ianniellomartina2000 https://padlet.com/321fisica/btfqzrx8097h/wish/313588152 "Plastic" is the general term improperly used to indicate "plastic materials". Depending on the used polymer, the characteristics, properties and fields of application of plastic material, which, by law, are identified by an acronym, change. The  pollution of environment, caused by plastic materials waste, is a global problem. According to a study published in 2015 and led by Georgia University (USA), every year between 5 and 13 million tons of plastic of the approximately 300 million  tons produced in the coastal area of Earth, are thrown in our seas. The best way to recover plastics we have used is differentiated waste collection. In order to protect the environment and better use this important resource, simple and effective methods of separating plastic materials have been developed.
(Adapted from Ugo Amaldi-L’ Amaldi per i licei scientifici. Blu. Zanichelli)]]> 2018-12-11 19:35:09 UTC https://padlet.com/321fisica/btfqzrx8097h/wish/313588152 One of plastic materials separation methods: ianniellomartina2000 https://padlet.com/321fisica/btfqzrx8097h/wish/313588677 It is based on the density of the material in order to separate PVC from PER, whose density is 1.3 and 1.4 kg/m³, a first tank is filled with CaCl₂, with density 1.35 kg/m³: PER fragments sink while PVC ones float. In order to separate PVC from lighter residues, the fragments floating in the first tank are poured into a second tank with a CaCl₂ solution with density equal to 1.2 kg/m³.
(Adapted from Ugo Amaldi-L’ Amaldi per i licei scientifici. Blu. Zanichelli)]]> 2018-12-11 19:36:02 UTC https://padlet.com/321fisica/btfqzrx8097h/wish/313588677 Plastic pollution ianniellomartina2000 https://padlet.com/321fisica/btfqzrx8097h/wish/313604901 2018-12-11 20:05:06 UTC https://padlet.com/321fisica/btfqzrx8097h/wish/313604901 ianniellomartina2000 https://padlet.com/321fisica/btfqzrx8097h/wish/313643947 The separation of different plastic is only a little part of the total production and even today in Europe about 30% of undifferentiated plastic waste is sent to the rubbish dump while the 40% is transformed into energy and 30% is recycled to produce new manufactured goods.
(Adapted from Ugo Amaldi-L’ Amaldi per i licei scientifici. Blu. Zanichelli)]]> 2018-12-11 21:46:11 UTC https://padlet.com/321fisica/btfqzrx8097h/wish/313643947 anna_ciardiello https://padlet.com/321fisica/btfqzrx8097h/wish/313768778 2018-12-12 10:18:38 UTC https://padlet.com/321fisica/btfqzrx8097h/wish/313768778 How can we use electrostatics? ianniellomartina2000 https://padlet.com/321fisica/btfqzrx8097h/wish/313874249 Electrostatics is used to separate metal fragments from plastic ones. Before the metal plate there's a metal tip which emits a consistent flow of electrons, which are deposited on the fragments dragged by the cylinder while it is rotating. The metal pieces, being conductors, pass the acquired charge to the cylinder which is connected to the ground and are detatched by gravity. Plastic scraps, which are insulators, mantain their own charge and adhere to the cylinder from which they are dragged. It is clear that if waste comes from recycled waste, technology involved to recycle or the disposal of this are easier as well as the costs are lowered because the material has already undergone an important selection at the origin. (Adapted from Ugo Amaldi-L’ Amaldi per i licei scientifici. Blu. Zanichelli)]]> 2018-12-12 15:15:07 UTC https://padlet.com/321fisica/btfqzrx8097h/wish/313874249 A method based on plastic electrostatic properties.... 321fisica https://padlet.com/321fisica/btfqzrx8097h/wish/317469765 Another separation method is based on electrostatic properties of plastic. The fragments,shredded by the machine, become charged by rubbing (Triboelectricity). The fragments with a negative electric charge are attracted by a positively charged plate, while the other remain attached to the rotating cylinder. According to triboelectricity, this is the behaviour of different type of plastic:
P. c.   PA >ABS>PS >PP> PVC N. c. (P.c.= positive charge, N.c= nega- tive charge). (Adapted from Ugo Amaldi-L’ Amaldi per i licei scientifici. Blu. Zanichelli)
]]> 2019-01-04 16:03:56 UTC https://padlet.com/321fisica/btfqzrx8097h/wish/317469765 alessia_bagarolo https://padlet.com/321fisica/btfqzrx8097h/wish/318477215 https://bubbl.us/NDk3OTQ4OS85NTI5NDA1L2UxMGU5MjhmZDY4YTVmMDQxZjRhNjk0ZTY3MGZiNWJl-X?utm_source=shared-link&utm_medium=link&s=9529405]]> 2019-01-08 18:29:09 UTC https://padlet.com/321fisica/btfqzrx8097h/wish/318477215 marti0188 https://padlet.com/321fisica/btfqzrx8097h/wish/318482582 https://bubbl.us/NDk3NTgwNy8yMjA1Mjc0LzBiNDM5NzJiNTg3MmJmOWI5ZTVmY2JhOTg3MjY2YzY1@X?utm_source=shared-link&utm_medium=email&s=2205274]]> 2019-01-08 18:36:32 UTC https://padlet.com/321fisica/btfqzrx8097h/wish/318482582 antimoboccagna27 https://padlet.com/321fisica/btfqzrx8097h/wish/318709430 2019-01-09 11:11:34 UTC https://padlet.com/321fisica/btfqzrx8097h/wish/318709430 “Life is not a thing of nothing... ianniellomartina2000 https://padlet.com/321fisica/btfqzrx8097h/wish/325181047 2019-01-28 22:27:41 UTC https://padlet.com/321fisica/btfqzrx8097h/wish/325181047