Study on the adhesion of different types of lacquers used in food packaging

Barilli, F; Fragni, Rosaria; Gelati, S.; Montanari, A.

doi:10.1016/s0300-9440(02)00215-1

Cited by 38 publications

(24 citation statements)

References 3 publications

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“…The phenomenon of lacquer adhesion occurs through various bonding mechanisms including van der Waals forces, electrostatic forces and induction forces [1], the mode of which will change depending on the substrate and applied coating [12]. While adhesion under dry conditions is important through the processes that occur in can manufacture before filling, adhesion under wet conditions also proves key for a can's internal lacquer as it must be able to withstand the heat treatment of retorting while exposed to different formulations of foodstuffs [19], followed by prolonged exposure to the contents over periods extending through the entire shelf life of the can [15].…”

Section: Introductionmentioning

confidence: 99%

Inter-layer Adhesion Performance of Steel Packaging Materials for Food Cans Under Retort Conditions

Allman

Jewell

Vooys

et al. 2018

J Package Technol Res

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The steel packaging industry faces the dual challenge imposed by legislation to eradicate the use of Chrome(VI) from substrate manufacture and the removal of Bisphenol-A (BPA) from the organic lacquer at the point of food contact. The paper reports on an experimental investigation into the quality of adhesion between the coatings and substrates as a result of the retort process, typically the harshest conditions to which the materials will be exposed. In terms of adhesion, the novel Chrome(III) substrates show promise when compared with current Chrome(VI) substrate. There is a significant reduction in the adhesion of the polyester-based Bisphenol-A non-intent lacquers compared to the incumbent epoxy-phenolic lacquers. Adhesion performance is lower with an increase in retort temperature and time of exposure. The adhesion further reduces in mild acidic and saline conditions. The reduction in adhesion post-retort is attributed to the sensitivity of the polyester-based BPANI lacquers to water vapour absorption. The process reversible nature of the adhesion loss indicates that, at short timescales, the adhesion loss is a result of polyester hydrolysis. Acidic and saline solutions also lead to a reduction in adhesion as a result of metal surface corrosion. The paper has impact on producers, fillers and consumers of steel packaging foodstuffs.

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Section: Introductionmentioning

confidence: 99%

Inter-layer Adhesion Performance of Steel Packaging Materials for Food Cans Under Retort Conditions

Allman

Jewell

Vooys

et al. 2018

J Package Technol Res

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“…Wet adhesion evaluation by cathodic delamination of food can coatings has also been described by other researchers [21,31], as a practical in situ comparison tool.…”

Section: Delamination Resistancementioning

confidence: 94%

“…Today, it is generally acknowledged that a continuous and uniform coating, unpigmented and free from inherent defects, can protect the underlying substrate by a combination of barrier [20] and adhesive properties [21]. The barrier property of a coating can be described as its ability to hinder water, ions and oxygen permeation through the polymer network.…”

Section: Introductionmentioning

confidence: 99%

“…Their characteristics render them a good choice of barrier coatings for avoiding corrosion caused by the aggressive internal can conditions, but also by hindering metallic contamination of the can content [21,[30][31][32]. Additionally, the absence of inhibiting and other leaching additives, present in most commercially available coating systems, facilitates electrolyte diffusion studies.…”

Section: Introductionmentioning

confidence: 99%

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A bulk and localised electrochemical assessment of epoxy-phenolic coating degradation

Kefallinou

Lyon

Gibbon

2017

Progress in Organic Coatings

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Abstract:Water absorption is believed to be one of the main causes of coating deterioration and degradation. General knowledge dictates that a sudden increase in the coating capacitance, detected during the beginning of immersion, can be attributed to water absorption taking place through the free volume of the polymer. In the examined epoxy-phenolic coating, a quick water saturation state is reached within 24h of immersion; however, there is evidence to suggest that water absorption is not the only required factor for corrosion initiation. In the following investigation, the effects of the curing degree, the absorbed water volume, and failure time of intact defect-free coatings were evaluated. A combination of equivalent circuit models were employed to describe the changes taking place across the coating with time. The dielectric properties of the coating material were assessed to account the contribution of the metal-polymer bonds to corrosion protection. Electrochemical Impedance Spectroscopy (EIS) results showed improved coating performance for increased coating curing degree. However, the water content of epoxy-phenolics has 2 been increasing with higher coating curing and polymer free volumes, in a combination of dry and immersed testing conditions. Similarly, Localised Electrochemical Impedance Spectroscopy (LEIS) has confirmed water absorption, coating failure and increased coating resistance for highly cured capacitive systems, in the microscale.

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“…The method of tinplate passivation has been shown to result a change in tinplate surface chemistry and subsequently on lacquer adhesion [2]. Dry and wet adhesion (the adhesion after exposure to high temperature steam of the foodstuff cooking process) between lacquer systems and tinplate substrates has been investigated [1] using EIS but this did not examine any thermal pretreatment. The presence of this DOS oil (dioctyl sebacate) which protects the surface from immediate oxidation and provides a lubricating surface) and the level of tin oxide on the surface has been shown to significantly affect tinplate substrate wetting [18], although no adhesion was considered.…”

mentioning

confidence: 99%

Surface and Adhesion Characteristics of Current and Next Generation Steel Packaging Materials

Melvin

Jewell

Vooys

et al. 2018

J Package Technol Res

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Steel packaging remains an important mean by which foodstuffs and other products can be stored safely for a prolonged period of time. The industry is being challenged by the dual legislative pressures which require the elimination of Chrome (VI) from the manufacturing process and the elimination of bisphenol A as a component from the lacquer system. Initial indications suggest lower adhesive performance, and it has been postulated that thermal treatment may be a mean of improving adhesion. Three substrates (two current and one future) were physically and chemically characterized prior and post treatment and the resultant impact of adhesion was quantified. The net impact of the thermal treatment is that it increases the adhesion of the lacquer on the surface. As there is minimal change in the physical characteristics of the surface, the authors propose that this is a result of changes in the chemical surface species, particularly the increase in the oxidic nature of each of the substrates which provides additional bonding sites for the organic species in the lacquer. These trends are observed for current substrate materials as well as next generation Chrome VI free substrate. Next generation replacement substrate materials perform better than current materials for dry adhesion while next generation bisphenol A non-intent lacquer materials perform poorer than the current epoxy phenolic materials.

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Study on the adhesion of different types of lacquers used in food packaging

Cited by 38 publications

References 3 publications

Inter-layer Adhesion Performance of Steel Packaging Materials for Food Cans Under Retort Conditions

Inter-layer Adhesion Performance of Steel Packaging Materials for Food Cans Under Retort Conditions

A bulk and localised electrochemical assessment of epoxy-phenolic coating degradation

Surface and Adhesion Characteristics of Current and Next Generation Steel Packaging Materials

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