Adhesion Measurements for Electrostatic Powder Coatings

Stötzel, H.; Schmidt, Hildegard; Auerbach, Dan; Makin, B.; Dastoori, K.; Bauch, Henning A.

doi:10.1016/s0304-3886(97)00046-6

Cited by 8 publications

(6 citation statements)

References 1 publication

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“…A previous study also showed that adhesion increases with cohesiveness of the powder (Sumawi and Barringer 2005). Adhesion is affected by interparticle/particle cohesion and the higher the cohesiveness of the powder, the higher the adhesion to the substrate (Stözel and others 1997). The adhesion and cohesiveness of 2 of the 8 powders changed with solution pH.…”

Section: Resultsmentioning

confidence: 99%

“…Adhesion with positive corona was higher than with negative corona electrostatic coating when coating insulating powders such as epoxy, nylon, and diacon (Cross 1975). Electrostatic adhesion increases as the charge‐to‐mass ratio of the powder increases (Stözel and others 1997). Using protein powders, transfer efficiency is higher with positive than with negative corona electrostatic coating (Sumawi and Barringer 2005).…”

Section: Introductionmentioning

confidence: 99%

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Effect of Hydrogen Ion Concentration and Electrostatic Polarity on Food Powder Coating Transfer Efficiency and Adhesion

Setyo

Barringer

2007

Journal of Food Science

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Two kinds of soy protein isolate, rice protein, whey protein isolate, albumen, bovine collagen hydrolysate, NaCl, and corn starch were used in this study. Solutions were prepared by mixing the powder and distilled water (1:8 ratio) and either H(2)SO(4) or NH(4)OH to obtain pH 3, 5, 7, 9, and 11. The solutions were dried to produce powders with different hydrogen ion concentrations and the powders were ground. Powders were coated nonelectrostatically and using negative and positive polarity corona electrostatically. There was no solution pH effect on transfer efficiency or adhesion for most powders. However, transfer efficiency and density of both of the soy protein isolates and corn starch changed with solution pH. Solution pH may have affected the density, which affected the transfer efficiency for these powders. Adhesion and cohesiveness of one of the soy protein isolates and corn starch also changed with solution pH. Solution pH may have affected the cohesiveness, which affected the adhesion for these powders. Negative and positive coronas produced the same results for most powders, with no solution pH effect, except for one of the soy protein isolates, rice protein, and corn starch. These powders accumulated on the electrode wires during negative corona electrostatic coating, reducing transfer efficiency and adhesion. This polarity effect was intermittent, implying it is due to tribocharging.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Hydrogen Ion Concentration and Electrostatic Polarity on Food Powder Coating Transfer Efficiency and Adhesion

Setyo

Barringer

2007

Journal of Food Science

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“…Extensive research has been undertaken into airborne particles (aerosols) in electrostatic coating processes [4,5,6] and into dry powder formulations for ease of inhalation [7]. Whilst the theory and application of ultrasonics to dry particulate material has been reported [9], there is little on the interaction of audio frequency sound with powdered material.…”

Section: Interaction Of Sound With Powdered Materialsmentioning

confidence: 99%

Removal of Electrostatically Deposited Powders Using High Intensity Low Frequency Sound Part 1: Experimental Deposition and Removal

Seiffert

Gibbs

2010

Journal of Low Frequency Noise, Vibration and Active Control

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This paper describes the controlled removal of powder layers using high intensity low frequency sound. The research has an industrial application, the cleaning of electrostatic precipitator filters in coal-fired power stations. The aim of the work is to quantify the sound pressure level and frequency content required to overcome adhesive and cohesive bonding forces formed when powder is electrostatically deposited onto a metal surface. In this, the first of two papers, a repeatable method for electrostatically depositing powder layers on to a metal surface is described. The design, construction and calibration of a high intensity wave tube also are described. The measured sound pressure level required for removal is compared with prediction. Measurements in a reverberant acoustic field using commercially available acoustic cleaning systems also are reported.

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“…Some recent studies have added water or oil to glass beads or sand to “simulate” cohesion,9–13 but dry fine particles where cohesion is due to forces other than capillary surface tension effects have only recently been taken into consideration in the past few years 14–17. For these materials, as the particle‐size decreases, the interparticle forces (for example, van der Waals forces) become stronger leading to an increase in cohesion.…”

Section: Introductionmentioning

confidence: 99%