scholarly journals Effects of Recycled Fiber Fines on Hand Sheet Properties of Different Unbeaten and Beaten Pulps

2020 ◽  
Vol 71 (4) ◽  
pp. 327-337
Author(s):  
Sezgin Koray Gülsoy ◽  
Saffet Uysal
Keyword(s):  
Kraft Pulp ◽  
Strength Properties ◽  
Populus Tremula ◽  
The Other ◽  
Paper Strength ◽  
Pinus Brutia ◽  
Recycled Pulp ◽  
European Aspen ◽  
Calabrian Pine ◽  
Recycled Fiber

In this study, 5, 10, and 15 % secondary fines of recycled pulp were added to unbeaten and beaten (28 ºSR) samples of recycled pulp, Turkish Calabrian pine (Pinus brutia Ten.) kraft pulp, and European aspen (Populus tremula L.) kraft pulp. The effects of the addition of fiber fines on hand sheets properties were evaluated. The addition of fiber fines to the unbeaten pulps improved the strength properties of hand sheets. The roughness of hand sheets was also decreased with the addition of fines. When fiber fines were added to the beaten pulps, the type of pulp strongly affected the paper strength properties. The strength properties of beaten pulps of Turkish Calabrian pine and European aspen were decreased with the addition of fiber fines, while the strength properties of beaten pulps of recycled pulp were increased. On the other hand, the air permeance of unbeaten and beaten samples was decreased with the addition of fiber fines. Consequently, the addition of fines to unbeaten and beaten pulps had a more pronounced effect on European aspen kraft pulp and recycled pulp than on Turkish Calabrian pine kraft pulp. Also, the strength of paper made of unbeaten recycled pulp with the addition of 15 % fines was higher than that of fines-free beaten recycled pulp.

scholarly journals Study of the mechanical behavior of recycled fibers. Applications to papers and paperboards.

2018 ◽  
Author(s):  
Imtiaz Ali
Keyword(s):  
Surface Friction ◽  
Strength Properties ◽  
Size Exclusion ◽  
Ultrastructural Changes ◽  
X Rays ◽  
Paper Strength ◽  
Electron Microscopic ◽  
Paper Properties ◽  
Recycled Pulp ◽  
Fibre Width

Incorporation of recycled fibres in high value paper products can reduce cost and environmental loads. Papermaking potential of cellulosic fibres decreases with recycling. The phenomenon of fibre hornification during pressing and drying is normally held responsible for the loss in strength. To study the impacts of recycling on pulp, fibre and paper properties some non conventional characterisation techniques like fibre saturation point, X-rays microtomography, environmental scanning electron microscopic observations, atomic forcemicroscope (PeakForce QNM mode) and inverse size exclusion chromatography(ISEC) were used. In order to achieve good reproducibility of ISEC measurements,a semi-automatic column fabrication pilot system was built. The techniques were first validated on refining process before being applied to the recycling process. In this study, it was found that fibre hornification alone cannot fully explain loss in strength during recycling. The loss in strength is much more complex and it is required to understand the morphological and ultrastructural changes associated with recycling. Fibre width, cell wall thickness,curl, kink, irregularities decreased during recycling. Fibre became hard and brittle in dry state. Number of weak points in the fibre wall were increased initially and in the later recyclings. The increase in wet breaking length indicates increased surface friction and capillary forces with recycling. Decrease in bonded area during first recycle may be caused by the loss of fines and fibre flexibility whereas the increase afterwards may be linked to the lumen collapse.The strength of fibres did not decrease with recycling as shown by zero-span breaking lengths therefore the quality of bond may be deteriorated. It was thought that the partially delaminated P/S1 layers may be responsible for the loss of paper strength. It is suggested since the significant change is associated with the pressing and drying of never dried pulp therefore the drying process needs to be revisited. The delaminated layer should be restored so as to increase the recyclability of the recovered fibres for high value paper. Influence of recycled pulp blends on physical properties of paper was also studied. It was revealed that small quantity of recycled pulp can be used without significantly affecting the mechanical strength properties.

scholarly journals PENINGKATAN MUTU KERTAS DAUR ULANG MENGGUNAKAN XYLAN ( IMPROVEMENT QUALITY OF RECYCLED FIBER USING XYLAN )

2017 ◽  
Vol 7 (01) ◽  
pp. 33
Author(s):  
Sonny Kurnia Wirawan ◽  
Chandra Apriana Purwita ◽  
Nina Elyani
Keyword(s):  
Agricultural Waste ◽  
Strength Properties ◽  
Paper Strength ◽  
Tensile Index ◽  
Potential Source ◽  
Recycled Fiber ◽  
Corrugated Cardboard

ABSTRACTCorncob as agricultural waste is a potential source of xylan to be used as an additive to increase the paper strength sheets originating from old corrugated cardboard (OCC). The aim of this research is to know increasing of strength properties from recycled fiber after addition of corncob xylan, compared to the commercial xylan. The xylan extraction was carried out by acid and the addition of xylan to the fiber was carried out at 80 ºC for 30 minutes. The results showed that the use of corncob xylan 5% (w/w) can increase the tensile index by 13.08%, burst index by 9.24%, ring crush test (RCT) index by 39.13% and corrugated medium test (CMT) index by 17.44%.ABSTRAKTongkol jagung sebagai limbah pertanian merupakan sumber xylan yang potensial yang dapat digunakan sebagai aditif untuk meningkatkan kekuatan lembaran kertas daur ulang yang berasal dari Kertas Karton Gelombang (KKG) bekas. Tujuan penelitian ini adalah untuk mengetahui peningkatan kekuatan lembaran kertas daur ulang setelah penambahan xylan dari tongkol jagung, dibandingkan dengan xylan komersial. Ekstraksi xylan dilakukan dengan metode asam dan penambahan xylan terhadap serat dilakukan pada temperatur 80ºC selama 30 menit. Hasil penelitian menunjukkan bahwa penggunaan xylan tongkol jagung sebanyak 5% (berat xylan/berat kering pulp) dapat meningkatkan indeks tarik 13,08%, indeks retak 9,24%, indeks RCT 39,13% dan indeks CMT 17,44%.

The Use of Oil Palm Empty Fruit Bunches (OPEFB) Fibers as Partial Replacement for Imported Recycled Fibers

2017 ◽  
Vol 737 ◽  
pp. 335-340 ◽  
Author(s):  
A.B. Khairul Hafizuddin ◽  
Roslan Rohaizu ◽  
W.D. Wan Rosli
Keyword(s):  
Oil Palm ◽  
Paper Industry ◽  
Strength Properties ◽  
Partial Replacement ◽  
Paper Strength ◽  
Empty Fruit Bunches ◽  
Recycled Pulp ◽  
Recycled Fibers ◽  
The Cost

Papermaking in Malaysia is basically based on recycled (secondary) fibers which are sourced from various parts of the world with prices depending on the quality of the fibers procured. The costs of paper production could possibly be reduced by using local fibers as partial replacement provided that the strength requirements are not compromised; and one such type is the oil palm fibers which are obtained as the by-product of the palm oil industry. This paper reports the use of the oil palm empty fruit bunch (OPEFB) fiber as a partial substitute in the production of corrugating medium. Both unbleached and totally chlorine free (TCF) bleached OPEFB pulps were mixed in different ratios with high quality recycled pulps which had been mechanically and chemically treated. Burst strength results indicate as high as 70% recycled pulp can be replaced by OPEFB pulps yet still having strength properties that are comparable with the industrial produced corrugating medium. Although the effect of bleached pulp is significant at high addition levels of more than 70%, the cost-energy balance will not be effective to use these bleached fibers, and furthermore the utilization of unbleached pulps also gave the same desired results. The use of the underutilized OPEFB fibers for replacement of imported recycled fibers without compromising the paper strength qualities could help the Malaysian paper industry in their quest for finding fiber alternatives.

scholarly journals KARAKTERISTIK PULP KIMIA MEKANIS DARI KENAF (Hibiscus cannabinus L.) UNTUK KERTAS LAINER

2016 ◽  
Vol 4 (01) ◽  
Author(s):  
Teddy Kardiansyah ◽  
Susi Sugesty
Keyword(s):  
Kraft Pulp ◽  
Sodium Hydroxide Solution ◽  
Strength Properties ◽  
Hibiscus Cannabinus ◽  
Paper Strength ◽  
Physical Strength ◽  
Tear Index ◽  
Virgin Pulp ◽  
Kenaf Bast ◽  
Crush Strength

Liner paper is commonly used for packaging because of its high bursting and ring crush strength. To meet these properties, liner paper strength relies on about 10-40% content of NUKP (Needle Unbleached Kraft Pulp). Currently, Indonesia does not produce NUKP, so it must be imported and the price is expensive. Liners paper in Indonesia is usually made from waste paper (old corrugated containers) that has unacceptable strength properties. To improve the strength properties, virgin pulp should be used. This study aimed to make virgin pulp from kenaf by chemimechanical process. Its physical strength was tested as a NUKP substitute. The results show that Kenaf mechanical pulp from Kenaf bast treated by using 6% sodium hydroxide solution fulfills the NUKP specifications according to SNI- 6106-1999, i.e. a fiber length of 4.24 mm, a freeness of 760 mL CSF, a tensile index of 66.54 Nm/g, a burst index of 5.72 kPam2/g, and a tear index of 18.09 mNm2/g.Keywords: nonwood, chemimechanical pulp, kenaf, bast, core  ABSTRAK Kertas lainer merupakan kertas industri yang digunakan untuk kemasan, dengan sifat ketahanan retak dan ketahanan tekan lingkar (ring crush) yang tinggi. Untuk mendapatkan kedua sifat tersebut maka biasanya kekuatan kertas lainer bertumpu pada penggunaan NUKP (pulp kraft serat panjang belum putih) dengan proporsi sekitar 10 – 40%. Saat ini Indonesia tidak memproduksi NUKP sehingga kebutuhan NUKP harus diimpor dan harganya mahal. Kertas lainer di Indonesia pada saat ini hampir semuanya dibuat dari karton bekas, disamping itu pengolahan karton bekas memiliki masalah pada kekuatan lembaran. Jika pembuatan karton menggunakan serat asli (virgin pulp), maka masalah kekuatan lembaran dapat diatasi. Penelitian ini bertujuan untuk membuat pulp dari Kenaf dengan proses kimia mekanis. Bahan baku nonkayu yaitu kenaf dibuat pulp mekanis dengan menggunakan proses Chemimechanical Pulp (CMP). Selanjutnya pulp mekanis yang diperoleh diuji kekuatan fisiknya untuk melihat potensinya sebagai pulp NUKP. Pulp mekanis kenaf yang berasal dari kulit kenaf dengan penggunaan natrium hidroksida (NaOH) 6% telah memenuhi spesifikasi pulp NUKP sesuai dengan SNI 6106-1999, yaitu panjang serat 4,24 mm, freeness 760 mL CSF, indeks tarik 66,54 Nm/g, indeks retak 5,72 kPam2/g dan indeks sobek 18,09 mNm2/g.Kata kunci: non kayu, pulp kimia mekanis, kenaf, kulit, batang tanpa kulit

A novel predictive method for filler coflocculation with cellulose microfibrils

TAPPI Journal ◽  
2019 ◽  
Vol 18 (11) ◽  
pp. 653-664
Author(s):  
IGNACIO DE SAN PIO ◽  
KLAS G. JOHANSSON ◽  
PAUL KROCHAK
Keyword(s):  
Negative Impact ◽  
High Strength ◽  
Strength Properties ◽  
Cellulose Microfibrils ◽  
Paper Strength ◽  
Flow Loop ◽  
Cationic Starch ◽  
Reflectance Measurement ◽  
Drainage Rate ◽  
Complete Study

Different strategies aimed at reducing the negative impact of fillers on paper strength have been the objective of many studies during the past few decades. Some new strategies have even been patented or commercialized, yet a complete study on the behavior of the filler flocs and their effect on retention, drainage, and formation has not been found in literature. This type of research on fillers is often limited by difficulties in simulating high levels of shear at laboratory scale similar to those at mill scale. To address this challenge, a combination of techniques was used to compare preflocculation (i.e., filler is flocculated before addition to the pulp) with coflocculation strategies (i.e., filler is mixed with a binder and flocculated before addition to the pulp). The effect on filler and fiber flocs size was studied in a pilot flow loop using focal beam reflectance measurement (FBRM) and image analysis. Flocs obtained with cationic polyacrylamide (CPAM) and bentonite were shown to have similar shear resistance with both strategies, whereas cationic starch (CS) was clearly more advantageous when coflocculation strategy was used. The effect of flocculation strategy on drainage rate, STFI formation, ash retention, and standard strength properties was measured. Coflocculation of filler with CPAM plus bentonite or CS showed promising results and produced sheets with high strength but had a negative impact on wire dewatering, opening a door for further optimization.

RATES OF SURFACE FIRE SPREAD IN A YOUNG CALABRIAN PINE (Pinus brutia Ten.) PLANTATION

2012 ◽  
Vol 11 (8) ◽  
pp. 1475-1480 ◽  
Author(s):  
Omer Kucuk ◽  
Ertugrul Bilgili ◽  
Serkan Bulut ◽  
Paulo M. Fernandes
Keyword(s):  
Fire Spread ◽  
Surface Fire ◽  
Pinus Brutia ◽  
Calabrian Pine

scholarly journals Development of F1 hybrid population and the high-density linkage map for European aspen (Populus tremula L.) using RADseq technology

2017 ◽  
Vol 17 (S1) ◽  
Author(s):  
Anatoly V. Zhigunov ◽  
Pavel S. Ulianich ◽  
Marina V. Lebedeva ◽  
Peter L. Chang ◽  
Sergey V. Nuzhdin ◽  
...  
Keyword(s):  
Linkage Map ◽  
High Density ◽  
Populus Tremula ◽  
Hybrid Population ◽  
F1 Hybrid ◽  
European Aspen ◽  
High Density Linkage Map

scholarly journals New technology for developing a lightweight refiner plate for hardwood kraft pulp fibers

BioResources ◽  
2020 ◽  
Vol 15 (4) ◽  
pp. 9128-9142
Author(s):  
Byeong-Geol Min ◽  
Ji-Young Lee ◽  
Chul-Hwan Kim ◽  
See-Han Park ◽  
Min-Seok Lee ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Fiber Length ◽  
Kraft Pulp ◽  
New Technology ◽  
Strength Properties ◽  
Pulp Fibers ◽  
Low Intensity ◽  
Novel Technology ◽  
Draft Angle ◽  
Reducing Energy

Sand casting makes it difficult to manufacture a fine bar plate for low intensity refining. This study introduced a novel technology for manufacturing lightweight fine bar plates and compared the effects to traditional bar plates. The lightweight fine bar plate base was manufactured using a lightweight aluminum alloy and stainless-steel. Because the bars were inserted into the plate vertically without the draft angle, the stock throughput was improved by approximately 27% compared to the sand-casted bar plates. Additionally, the lightweight fine bar plate maximized internal and external fibrillation while minimizing fiber length loss. In conclusion, the lightweight fine bar plate was shown to be more effective in improving the strength properties of paper and reducing energy consumption.

scholarly journals Strong paper from spruce CTMP – Part II: Effect of pressing at nip press temperatures above the lignin softening temperature

2018 ◽  
Vol 33 (1) ◽  
pp. 142-149 ◽  
Author(s):  
Sven Norgren ◽  
Gunilla Pettersson ◽  
Hans Höglund
Keyword(s):  
Compression Strength ◽  
Kraft Pulp ◽  
Softening Temperature ◽  
Strength Properties ◽  
Kraft Pulps ◽  
Cationic Starch ◽  
Tensile Index ◽  
Very High

Abstract The main objective of the current study was to demonstrate that it is possible to enhance strength properties of sheets from spruce HT-CTMP and CTMP furnishes up to the same level as is common on sheets from softwood kraft pulps by changing conditions in papermaking. To achieve that, sheets of spruce HT-CTMP and CTMP were consolidated at densities close to that of the reference bleach kraft pulp by pressing at press nip temperatures well above the tack and softening temperatures of lignin. On sheets from spruce CTMP (CSF 420 ml), where the fibers were surface treated with cationic starch, it was possible to reach tensile index at the same level as on sheets from the untreated reference kraft pulp. The compression strength (SCT) of CTMP and HT-CTMP sheets, which were achieved at the highest press nip temperature (200 °C) in the study, was equal to or higher than that of the reference kraft pulp sheets. The results show that there is a great yet unexploited potential in papermaking from spruce HT-CTMP and CTMP furnishes, which could be utilized in manufacturing of products where very high requirements upon strength is demanded.

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