Chemicals Used in Deinking and Their Function﻿

Bajpai, Pratima

doi:10.1016/b978-0-12-416998-2.00007-6

Cited by 14 publications

(14 citation statements)

References 8 publications

(12 reference statements)

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“…Ex Beissn., 1891) (Howe Sound 100, Howe Sound P&P), provided dry, was used. The average pulp fiber length was 2.64 mm, with a density of 0.667 g/cm 3 and a calculated moisture content of 4.76%. A hardwood pulp from Alnus species (Mill., 1754) (Longview Hardwood, Weyerhaeuser) was provided in the wet lap form.…”

Section: Pulp Preparationmentioning

confidence: 99%

“…A hardwood pulp from Alnus species (Mill., 1754) (Longview Hardwood, Weyerhaeuser) was provided in the wet lap form. The average hardwood pulp fiber length was 0.9 mm, with a density of 0.80 g/cm 3 and a calculated moisture content of 35.4%. Finally, a softwood pulp from Pseudotsuga menziesii (Mirb., 1950) (Longview FIR-85, Weyerhaeuser) was provided in the wet lap form.…”

Section: Pulp Preparationmentioning

confidence: 99%

“…Finally, a softwood pulp from Pseudotsuga menziesii (Mirb., 1950) (Longview FIR-85, Weyerhaeuser) was provided in the wet lap form. The average pulp fiber length was 2.4 mm, with a density of 0.70 g/cm 3 and a calculated moisture content of 43.8%. Wet lap refers to a form of pulp produced from residual mill and whole log chips that must be kept in moist conditions.…”

Section: Pulp Preparationmentioning

confidence: 99%

“…Cellulose is a natural polymer of glucose and is produced by all plants, making it the most abundant and continually renewable polysaccharide on Earth [1]. Utilized by humans for thousands of years [2], it remains vital to the economy, with approximately 400 million tons of paper and associated products produced globally each year [3]. Cellulosic pulps are the product of delignification of wood chips, part of the papermaking process [4,5] where the undesired hemicelluloses, lignin, and other associated biopolymers of wood are mostly removed to create a purified cellulose product, also referred to as pulp [4,[6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Preliminary Exploration of the Red Pigment from Scytalidium cuboideum as a Cellulosic Pulp Colorant

et al. 2022

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Pollution from the international dye industry continues to be a global problem. Biotechnology offers new options, including a closer look at select wood decay fungi to replace inorganic dyes. The pigments produced by a small group of soft rotting fungi are generally naphthoquinonic and remarkably stable. From this group, the dramada crystals, produced by Scytalidium cuboideum, are of particular interest. To test the application of this pigment as a natural colorant of cellulosic pulps, four different bleached pulps were selected (one hardwood, three softwood), in three different mediums (acetone, ethanol, and DI water). The pigment generated a significant change of color, but there was no significant difference in color intensity based on the solvent carrier. These preliminary results are promising as they open the door for further exploration of applications of fungal pigments in the paper industry. Once these pigments can be reliably grown, they will offer a sustainable organic alternative to polluting inorganic dyestuffs and help reduce the toxic effluent released into the soil and waterways.

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Section: Pulp Preparationmentioning

confidence: 99%

Section: Pulp Preparationmentioning

confidence: 99%

Section: Pulp Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Preliminary Exploration of the Red Pigment from Scytalidium cuboideum as a Cellulosic Pulp Colorant

et al. 2022

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“…Dispersants with carboxyl acids include fatty acids (long hydrocarbon chains with a single carboxyl group [215]), either saturated (e.g., stearic acid [128,129,131]) or unsaturated, with a double carbon bond (C = C) (e.g. oleic acid [23,106,128,129,131,142,195]), short-chain dicarboxylic acids [130], and commercial dispersants with one or more carboxyl groups (e.g.…”

Section: Kos110 (Guangzhou Kangoushuang Trade)mentioning

confidence: 99%

Additive manufacturing of advanced ceramics by digital light processing: equipment, slurry, and 3D printing

Camargo¹

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Additive manufacturing (AM) or 3D printing is a set of technologies that fabricate parts by successively adding layers. This technique is already applied in all classes of materials. In ceramic manufacturing, AM allows the fabrication of small series components with greater geometric freedom, lower cost, and reduced delivery time. Among the AM technologies, vat photopolymerization (VP) stands out for its ability to produce ceramic pieces with excellent dimensional accuracy and surface finish. However, there is a shortage of VP commercial equipment dedicated to producing ceramics at an affordable price, given the challenges of dealing with raw material with high particle loading. In this work, which approaches the fabrication of advanced ceramics by digital light processing VP, the feasibility of using a topdown 3D printer prototype and an ordinary commercial bottom-up printer (usually applied in polymer 3D printing) in the processing of ceramic materials was tested. For this, a 3D printer prototype was designed and built, creating an innovative recoating system (patent pending), composed of two blades with distinct and sequential functions. This system aims to overcome the challenge of creating layers for ceramic suspensions, which usually have high viscosity. In addition, photosensitive suspensions were developed seeking to meet process requirements related to high ceramic loading, rheological behavior, photosensitive parameters, and stability.The ceramic powders were selected to evaluate the process using distinct groups of advanced ceramics: nanometric powders (3Y-TZP) and submicrometric powders (electrofused mullite).Furthermore, a combination of natural raw material (zircon) with alumina was used to investigate the in-situ formation of mullite-zirconia composites in 3D printed parts. Thus, photosensitive ceramic suspensions based on a nanometric zirconia powder (3Y-TZP) were developed and characterized, selecting the appropriate components (monomer, photoinitiator, and dispersant). In this way, a ceramic slurry was obtained capable of validating the developed prototype and manufacturing green ceramic bodies. Nonetheless, the same formulation was not suitable for the commercial 3D printer, due to its rheological behavior not being compatible with the equipment. On the other hand, the submicrometric mullite powder allowed the preparation of formulations with high solid loading (up to 50 vol%). These new formulations were successfully used in both pieces of equipment tested. Furthermore, the formulation based on the mixture of ceramic powders (zircon and alumina) showed that the technique can be combined with reactive sintering to create in-situ mullite and zirconia composites. After analysis of the thermal decomposition, a protocol for the thermal treatment was created and the printed bodies were submitted to burning of the organic components and sintering. Both 3D printers tested proved capable of creating dense ceramic pieces (>95%) and with geometries that would be unfeasible or even impossible by other man...

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Office waste paper as cellulose nanocrystal source

Orue

Santamaria‐Echart

Eceiza

et al. 2017

J of Applied Polymer Sci

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Cellulose nanocrystals (CNC) are isolated from office waste paper using an alkali solution and a subsequent acid hydrolysis process. The Fourier transform infrared spectroscopy and X-ray diffraction (XRD) results demonstrate that ink and fillers used in the papermaking industry are almost totally removed after alkali treatments. The XRD results show that CNCs obtained after 2 wt % NaOH solution treatment and a subsequent hydrolysis process exhibit only a cellulose I crystalline structure, and the crystallinity index value increases around 42% with respect to initial office waste paper. Nevertheless, CNCs obtained after 7.5 wt % NaOH solution treatment and a subsequent acid hydrolysis process show a mixture of cellulose I and cellulose II polymorphs. The thermal analysis shows that the CNCs obtained after 7.5 wt % NaOH solution treatment and a subsequent acid hydrolysis process are thermally less stable than other samples, suggesting that the cellulose chains could depolymerize into low molecular weight sugar compounds. Even though the atomic force microscopy images confirm the presence of CNCs, the optical images show that some cellulose microfibers still maintain their structure.

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Chemicals Used in Deinking and Their Function

Cited by 14 publications

References 8 publications

Preliminary Exploration of the Red Pigment from Scytalidium cuboideum as a Cellulosic Pulp Colorant

Preliminary Exploration of the Red Pigment from Scytalidium cuboideum as a Cellulosic Pulp Colorant

Additive manufacturing of advanced ceramics by digital light processing: equipment, slurry, and 3D printing

Office waste paper as cellulose nanocrystal source

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Chemicals Used in Deinking and Their Function﻿

Cited by 14 publications

References 8 publications

Preliminary Exploration of the Red Pigment from Scytalidium cuboideum as a Cellulosic Pulp Colorant

Preliminary Exploration of the Red Pigment from Scytalidium cuboideum as a Cellulosic Pulp Colorant

Additive manufacturing of advanced ceramics by digital light processing: equipment, slurry, and 3D printing

Office waste paper as cellulose nanocrystal source

Contact Info

Product

Resources

About

Chemicals Used in Deinking and Their Function