Foam Forming: An Effective Method to Prepare Polyimide Fiber-based Paper
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摘要
Well-dispersed fiber suspension is the precondition of good paper formation. Compared with cellulosic fibers, synthetic fibers are prone to flocculate because of their long length and hydrophobic nature,resulting in poor paper formation. To solve this problem, dispersants and extremely low forming consistency are typically adopted during the traditional wet-forming process, which cause a large amount of water consumption and treatment cost. Therefore, increasing forming consistency without compromising paper formation remains a challenge for papermakers. In this work, foam forming was adopted to disperse polyimide fibers(PI) with high forming consistency. The results showed that the formation index of handsheets increased when the bubble size and distribution became small and narrow. Compared with traditional wet-forming process with the same consistency(0.4%), the formation index of handsheets by foam forming increased by approximately 100%when C8 alkyl glucoside(APG08) concentration reached 16 g/L. Notably,forming consistency could increase by eight times while keeping the same level of paper formation. Overall, foam forming exhibits great advantages in dispersing long fiber and reducing water consumption and environmental pressure, and has potential applications in specialty paper made of long fibers.
Well-dispersed fiber suspension is the precondition of good paper formation. Compared with cellulosic fibers, synthetic fibers are prone to flocculate because of their long length and hydrophobic nature,resulting in poor paper formation. To solve this problem, dispersants and extremely low forming consistency are typically adopted during the traditional wet-forming process, which cause a large amount of water consumption and treatment cost. Therefore, increasing forming consistency without compromising paper formation remains a challenge for papermakers. In this work, foam forming was adopted to disperse polyimide fibers(PI) with high forming consistency. The results showed that the formation index of handsheets increased when the bubble size and distribution became small and narrow. Compared with traditional wet-forming process with the same consistency(0.4%), the formation index of handsheets by foam forming increased by approximately 100%when C8 alkyl glucoside(APG08) concentration reached 16 g/L. Notably,forming consistency could increase by eight times while keeping the same level of paper formation. Overall, foam forming exhibits great advantages in dispersing long fiber and reducing water consumption and environmental pressure, and has potential applications in specialty paper made of long fibers.
Well-dispersed fiber suspension is the precondition of good paper formation. Compared with cellulosic fibers, synthetic fibers are prone to flocculate because of their long length and hydrophobic nature,resulting in poor paper formation. To solve this problem, dispersants and extremely low forming consistency are typically adopted during the traditional wet-forming process, which cause a large amount of water consumption and treatment cost. Therefore, increasing forming consistency without compromising paper formation remains a challenge for papermakers. In this work, foam forming was adopted to disperse polyimide fibers(PI) with high forming consistency. The results showed that the formation index of handsheets increased when the bubble size and distribution became small and narrow. Compared with traditional wet-forming process with the same consistency(0.4%), the formation index of handsheets by foam forming increased by approximately 100%when C8 alkyl glucoside(APG08) concentration reached 16 g/L. Notably,forming consistency could increase by eight times while keeping the same level of paper formation. Overall, foam forming exhibits great advantages in dispersing long fiber and reducing water consumption and environmental pressure, and has potential applications in specialty paper made of long fibers.
引文
[1] Das D, Butola B, Renuka S. An investigation into fiber dispersion behavior in water with reference to wet-lay nonwoven technology[J]. Journal of Dispersion Science and Technology, 2012, 33(8):1225-1232.
[2] Kerekes R, Schell C. Characterization of fibre flocculation regimes by a crowding factor[J]. Journal of Pulp and Paper Science, 1992, 18(1):J32-J38.
[3] Hubbe M A. Flocculation and redispersion of cellulosic fiber suspensions:a review of effects of hydrodynamic shear and polyelectrolytes[J]. BioResources, 2007, 2(2):296-331.
[4] Radvan B, Gatward A P J. Formation of wet-laid webs by a foaming process[J]. TAPPI Journal, 1972, 55(5):748-751.
[5] Mira I, Andersson M, Boge L, et al. Foam forming revisited Part I. Foaming behaviour of fibre-surfactant systems[J].Nordic Pulp&Paper Research Journal, 2014, 29(4):679-688.
[6] Koponen A, Torvinen K, J?berg A, et al. Foam forming of long fibers[J]. Nordic Pulp&Paper Research Journal,2016, 31(2):239-247.
[7] Al-Qararah A M, Ekman A, Hjelt T, et al. A unique microstructure of the fiber networks deposited from foam-fiber suspensions[J]. Colloids and Surfaces A:Physicochemical and Engineering Aspects, 2015, 482:544-553.
[8] Timofeev O, Jetsu P, Kiiskinen H, et al. Drying of foamformed mats from virgin pine fibers[J]. Drying technology,2016, 34(10):1210-1218.
[9] Al-Qararah A M, Ekman A, Hjelt T, et al. Aqueous foam as the carrier phase in the deposition of fibre networks[C]//The 5th International Colloids Conference. Amsterdam,2015:21-24.
[10] Al-Qararah A M, Ekman A, Hjelt T, et al. Porous structure of fibre networks formed by a foaming process:a comparative study of different characterization techniques[J]. Journal of Microscopy, 2016, 264(1):88-101.
[11] Lappalainen T, Salminen K, Kinnunen K, et al. Foam forming revisited. Part II. Effect of surfactant on the properties of foam-formed paper products[J]. Nordic Pulp&Paper Research Journal, 2014, 29(4):689-699.
[12] Al-Qararah A M, Hjelt T, Koponen A, et al. Response of wet foam to fibre mixing[J]. Colloids and Surfaces A:Physicochemical and Engineering Aspects, 2015, 467:97-106.
[13] Xiang W, Filpponen I, Saharinen E, et al. Foam Processing of Fibers As a Sustainable Alternative to Wet-laying:Fiber Web Properties and Cause-effect Relations[J].ACS Sustainable Chemistry&Engineering, 2018, 6(11):14423-14431.
[14] Hou Q, Wang X. The effect of PVA foaming characteristics on foam forming[J]. Cellulose, 2017, 24(11):4939-4948.
[15] Hou Q, Wang X. Effect of fiber surface characteristics on foam properties[J]. Cellulose, 2018, 25(6):3315-3325.
[16] Li S, Xiang W, J?vinen M, et al. Interfacial stabilization of fiber-laden foams with carboxymethylated lignin toward strong nonwoven networks[J]. ACS Applied Materials&Interfaces, 2016, 8(30):19827-19835.
[17] Pitois O, Cohen-Addad S, H?ler R. Flow in foams and flowing foams[J]. Annual Review of Fluid Mechanics,2013, 45:241.
[18] Prud’homme R K, Khan S A. Foams:Theory,Measurements and Applications[M]. USA:CRC Press,1996:287-310.
[2] Kerekes R, Schell C. Characterization of fibre flocculation regimes by a crowding factor[J]. Journal of Pulp and Paper Science, 1992, 18(1):J32-J38.
[3] Hubbe M A. Flocculation and redispersion of cellulosic fiber suspensions:a review of effects of hydrodynamic shear and polyelectrolytes[J]. BioResources, 2007, 2(2):296-331.
[4] Radvan B, Gatward A P J. Formation of wet-laid webs by a foaming process[J]. TAPPI Journal, 1972, 55(5):748-751.
[5] Mira I, Andersson M, Boge L, et al. Foam forming revisited Part I. Foaming behaviour of fibre-surfactant systems[J].Nordic Pulp&Paper Research Journal, 2014, 29(4):679-688.
[6] Koponen A, Torvinen K, J?berg A, et al. Foam forming of long fibers[J]. Nordic Pulp&Paper Research Journal,2016, 31(2):239-247.
[7] Al-Qararah A M, Ekman A, Hjelt T, et al. A unique microstructure of the fiber networks deposited from foam-fiber suspensions[J]. Colloids and Surfaces A:Physicochemical and Engineering Aspects, 2015, 482:544-553.
[8] Timofeev O, Jetsu P, Kiiskinen H, et al. Drying of foamformed mats from virgin pine fibers[J]. Drying technology,2016, 34(10):1210-1218.
[9] Al-Qararah A M, Ekman A, Hjelt T, et al. Aqueous foam as the carrier phase in the deposition of fibre networks[C]//The 5th International Colloids Conference. Amsterdam,2015:21-24.
[10] Al-Qararah A M, Ekman A, Hjelt T, et al. Porous structure of fibre networks formed by a foaming process:a comparative study of different characterization techniques[J]. Journal of Microscopy, 2016, 264(1):88-101.
[11] Lappalainen T, Salminen K, Kinnunen K, et al. Foam forming revisited. Part II. Effect of surfactant on the properties of foam-formed paper products[J]. Nordic Pulp&Paper Research Journal, 2014, 29(4):689-699.
[12] Al-Qararah A M, Hjelt T, Koponen A, et al. Response of wet foam to fibre mixing[J]. Colloids and Surfaces A:Physicochemical and Engineering Aspects, 2015, 467:97-106.
[13] Xiang W, Filpponen I, Saharinen E, et al. Foam Processing of Fibers As a Sustainable Alternative to Wet-laying:Fiber Web Properties and Cause-effect Relations[J].ACS Sustainable Chemistry&Engineering, 2018, 6(11):14423-14431.
[14] Hou Q, Wang X. The effect of PVA foaming characteristics on foam forming[J]. Cellulose, 2017, 24(11):4939-4948.
[15] Hou Q, Wang X. Effect of fiber surface characteristics on foam properties[J]. Cellulose, 2018, 25(6):3315-3325.
[16] Li S, Xiang W, J?vinen M, et al. Interfacial stabilization of fiber-laden foams with carboxymethylated lignin toward strong nonwoven networks[J]. ACS Applied Materials&Interfaces, 2016, 8(30):19827-19835.
[17] Pitois O, Cohen-Addad S, H?ler R. Flow in foams and flowing foams[J]. Annual Review of Fluid Mechanics,2013, 45:241.
[18] Prud’homme R K, Khan S A. Foams:Theory,Measurements and Applications[M]. USA:CRC Press,1996:287-310.