Development of Deinking Agents for Flotation Systems: Part 3.

Masamizu, Kohji; Egawa, Junta; Hagiwara, Masaaki; Ukigai, Toshiyuki

doi:10.2524/jtappij.50.1384

Cited by 5 publications

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“…Most studies have investigated methods such as strong agitation, 3,7,8) ultrasonic wave irradiation, 9,10) and enzymatic treatment 11) to reduce the size of the particles in order to achieve greater toner liberation. However, it would be difficult to use the fibers that result from these methods to make high grade regenerated paper because they would be shredded if the waste paper comminuted until the toner particles can be liberated, which occurs at a size of approximately 10 mm.…”

Section: Introductionmentioning

confidence: 99%

Use of Kerosene to Improve Toner-Ink Liberation for Office Paper Recycling

et al. 2003

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A method to disintegrate photocopied or laser printed waste office paper by weak agitation and using kerosene as a toner softening agent was investigated. Under the conventional method using only sodium hydroxide, 3.8% of toner was liberated from paper. This figure increased to 98.1% by using undiluted kerosene, and to 80.1% by using 1% kerosene emulsion. Residual toner particles adhered to only one or a few paper fibers after these kerosene treatments. If residual toner was also included in this figure, toner liberation would reach 100%. The use of surfactants as dispersion agents for kerosene decreased the degree of liberation because it interferes with the softening of toner. It was also confirmed that sodium hydroxide treatment in advance of the kerosene treatment is important to increase toner liberation.

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Section: Introductionmentioning

confidence: 99%

Use of Kerosene to Improve Toner-Ink Liberation for Office Paper Recycling

et al. 2003

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“…[4][5][6][7] Although this method may not increase the deinking percentage, it could potentially suppress the creation of toner specks. Toner would thus remain on regenerated paper as fine particles, since toner coagulation could be checked in the flotation cell.…”

Section: Introductionmentioning

confidence: 99%

Coagulation Using Kerosene for Magnetic Deinking of Waste Office Paper

et al. 2003

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A method for disintegrating waste office paper using kerosene was reported in our previous paper, which achieved almost a 100% liberation of toner from paper fibers. The liberated toner must be completely separated to realize effective deinking. Recently, a new method for deinking waste officer paper by magnetic separation after hetero-coagulation of magnetic and non-magnetic toner by 1-octadecanol was reported by Augusta et al. Under this method, coagulation was carried out at 72 C. The 1-octadecanol liquid was then cooled to produce strong solid coagulates. As reported in our previous paper, kerosene has the ability to soften toner, and strong coagulates for magnetic separation may be produced by their adhesion when used as a flocculant. The present study investigated the size of toner particles liberated by the kerosene disintegration method, and compared the bonding strength between the toner particles coagulated by the addition of kerosene as a flocculant to those coagulated with 1-octadecanol. After these investigations, the coagulating and deinking properties of kerosene and 1-octadecanol were compared by rejecting toner coagulates with a neodymium-boron magnet. The results showed that nearly perfect deinking can be achieved with little paper loss, even in ambient temperature, due to the large and strong coagulates produced by this method. When kerosene was used in the disintegration and coagulation stages, the average coagulate size was 1114 mm, and a deinking percentage of 98.4% was attained through separation with a neodymium-boron magnet.

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The use of surfactants in de-inking paper for paper recycling

Borchardt

1997

Current Opinion in Colloid & Interface Science

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Development of Deinking Agents for Flotation Systems: Part 3.

Cited by 5 publications

References 0 publications

Use of Kerosene to Improve Toner-Ink Liberation for Office Paper Recycling

Use of Kerosene to Improve Toner-Ink Liberation for Office Paper Recycling

Coagulation Using Kerosene for Magnetic Deinking of Waste Office Paper

The use of surfactants in de-inking paper for paper recycling

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