تاثير سامانه آلوم-روزين پراكنده بر ويژگي هاي جذب آب، مقاومتي و نوري كاغذ تهيه شده از الياف بازيافتي

Effect of alum-dispersed rosin system on water absorption, strength and optical properties of papers made from recycled fibers

در اﯾﻦ ﺗﺤﻘﯿﻖ، اﺛﺮ ﺑﮑﺎرﮔﯿﺮي ﺗﻮاﻟﯽ آﻟﻮم-روزﯾﻦ ﭘﺮاﮐﻨﺪه ﺑﺮ وﯾﮋﮔﯽﻫﺎي ﻣﺨﺘﻠﻒ ﮐﺎﻏﺬ ﺗﻬﯿﻪﺷﺪه از اﻟﯿﺎف ﺑﺎزﯾﺎﻓﺘﯽ ﺑﺮرﺳﯽ ﺷﺪ. ﺑﺪﯾﻦ ﻣﻨﻈﻮر، آﻫﺎردﻫﯽ ﻣﻌﮑﻮس اﻟﯿﺎف ﺑﺎزﯾﺎﻓﺘﯽ ﺑﺎ ﺧﺸﮑﯽ 0/5 درﺻﺪ در 6/5pH ﺑﺎ ﺳﻄﻮح 1 و 1/5 درﺻﺪ آﻟﻮم، و 1/5 ،1 و 2 درﺻﺪ روزﯾﻦ ﭘﺮاﮐﻨﺪه ﺑﺮﻣﺒﻨﺎي وزن ﺧﺸﮏ اﻟﯿﺎف اﻧﺠﺎم ﺷﺪ. ﺳﭙﺲ وﯾﮋﮔﯽﻫﺎي ﺟﺬب آب، ﻧﻮري و ﻣﻘﺎوﻣﺘﯽ ﮐﺎﻏﺬﻫﺎي ﺑﺎ ﮔﺮاﻣﺎژ )g/m2 60±3( ارزﯾﺎﺑﯽ ﺷﺪ. ﺑﺮاﺳﺎس ﻧﺘﺎﯾﺞ، ﺑﺮاي ﮐﺎﻫﺶ ﺟﺬب آب، ﻣﺼﺮف ﺗﺎ 1 درﺻﺪ از دو ﻣﺎده آﻟﻮم و روزﯾﻦ ﭘﺮاﮐﻨﺪه ﺳﻄﺢ ﻣﻨﺎﺳﺐ آﻫﺎردﻫﯽ ﻣﯽﺑﺎﺷﺪ. در ﻧﺘﯿﺠﻪ، ﺟﺬب آب ﮐﺎﻏﺬﻫﺎ از 174±7/4g/m2 ﺑﻪ 0/4g/m2± 36 ﮐﺎﻫﺶ، و زاوﯾﻪ ﺗﻤﺎس ﻗﻄﺮه آب ﺑﺎ ﺳﻄﺢ ﮐﺎﻏﺬ از 31/2 ﺑﻪ 118/1 درﺟﻪ اﻓﺰاﯾﺶ ﯾﺎﻓﺖ. ﺑﻌﻼوه، ﻫﻤﺰﻣﺎن ﺑﺎ اﺛﺮ ﻣﻤﺎﻧﻌﺘﯽ ﻣﻮﻟﮑﻮلﻫﺎي روزﯾﻦ در ﭘﯿﻮﻧﺪ ﺑﯿﻦ اﻟﯿﺎف، آﻟﻮم ﺑﺎ ﺧﻨﺜﯽﺳﺎزي ﺑﺎر آﻧﯿﻮﻧﯽ و ﻣﺎﻧﺪﮔﺎري ﻧﺮﻣﻪﻫﺎي ﺳﻠﻮﻟﺰي ﺑﺎﻋﺚ ﺗﻮﺳﻌﻪ ﻗﺎﺑﻠﯿﺖ ﭘﯿﻮﻧﺪﯾﺎﺑﯽ اﻟﯿﺎف ﺷﺪه اﺳﺖ. ﻣﺎﺗﯽ ﮐﺎﻏﺬ ﺗﻬﯿﻪﺷﺪه ﻧﯿﺰ ﺑﻌﻠﺖ اﻓﺰاﯾﺶ ﻣﺎﻧﺪﮔﺎري ﭘﺮﮐﻨﻨﺪه در ﺑﺴﺘﺮ ﻓﯿﺒﺮي اﻟﯿﺎف اﻓﺰاﯾﺶ ﯾﺎﻓﺖ

In this study, the effect of alum- dispersed rosin sequence has been examined on different properties of papers made from recycled fibers. Therefore, reverse sizing recycled fibers with 0.5 consistency at pH6.5 was carried out by using 1 and 1.5 % alum, and 1, 1.5 and 2 % dispersed rosin, based on dry weight of pulp. Then, water absorption, optical and strength properties of papers with grammage (60±3 g/m2) were evaluated. Based on the results, to reduce the water absorption of papers, 1 % of both alum and dispersed rosin is required to achieve appropriate level of sizing. As a result, the water absorption of papers declined from 174±7.4 g/m2 to 36±0.4 g/m2, and the contact angle of water droplet with paper surface increased from 31.2 degree to 118.1 degree. Moreover, concurrent to the hydrophobicity of fibers surface formed by rosin molecules and its repellency impact of inter-fiber bonding, alum imparts an improvement of bonds in paper network owing to the neutralization of anionic trash and retention of cellulose fines. Paper opacity has been increased due to the development of filler retaining in fibrous web of paper.