Viscoelasticity studies for a fibrous collagen material: chrome-free leather

Liu, Cheng‐Kung; Latona, Nicholas P.; DiMaio, G. L.; Cooke, Peter

doi:10.1007/s10853-007-1744-1

Cited by 21 publications

(17 citation statements)

References 3 publications

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“…AU is an ideal inspection method for large items, such as pipes and containers, or biopolymers of leather and hide, etc 17. AU inspection involves pulsing ultrasonic signals at the materials and measuring the penetrated signal amplitude.…”

Section: Resultsmentioning

confidence: 99%

“…The airborne ultrasonic (AU) inspection was performed on a custom‐made AU tester that was manufactured by NDT Automation (Princeton Junction, NJ) 17, 18. The experimental setup consists of two ultrasonic transducers having a central frequency of 200 kHz, a transmitter with a 50 mm active area, which transmits ultrasonic pulses with a tone burst through a power amplifier, and a receiver with a 25 mm active area connected to a preamplifer.…”

Section: Methodsmentioning

confidence: 99%

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Biodegradable composites from polyester and sugar beet pulp with antimicrobial coating for food packaging

Coffin

Jin

et al. 2012

J of Applied Polymer Sci

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Totally biodegradable, double‐layered antimicrobial composite films were introduced for food packaging. The substrate layers of the sheets were prepared from poly(lactic acid) (PLA) and sugar beet pulp (SBP) or poly (butylene adipate‐co‐terephthalate (PBAT) and SBP by a twin‐screw extruder. The active layer consisting of antimicrobial in either PLA or chitosan was formed on the surfaces of the substrates by solution coating followed by solvent evaporation. Air‐coupled ultrasonic evaluation and microscopic examination showed a homogeneous structure for the composite sheets. Mechanical analysis and acoustic emission demonstrated the double‐layered composites possessing appropriate tensile strength and fracture characteristics for the use as light weight‐bearing materials. The release of Nisaplin® or allyl isothiocyanate (AIT) effectively suppressed the growth of Listeria monocytogenes and Salmonella cells, respectively; the co‐release of Nisaplin® and AIT played a synergistic effect on inhibition of L. monocytogenes. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Biodegradable composites from polyester and sugar beet pulp with antimicrobial coating for food packaging

Coffin

Jin

et al. 2012

J of Applied Polymer Sci

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“…By the time of tanning, the pelt does not contain sufficient lubricants to prevent it from drying into a hard/stiff material [19]. For this reason, after tanning, proper lubrication is needful [20]. Lubrication is done through the incorporation of oils and fats into leather matrix in finely dispersed form in a water medium (emulsion) in the process referred to as fatliquoring.…”

Section: Introductionmentioning

confidence: 99%

Effect of Crusting Operations on the Physical Properties of Leather

Nalyanya¹,

Rop²,

Onyuka³

et al. 2018

LFJ

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Physical properties of leather form vital quality parameters that determine the performance characteristics in their areas of applications. However, the transformational processing of hide to leather involves a series of both chemical and physical/mechanical changes that affect these mechanical properties. Many researches have been published regarding the effect of processing on the mechanical properties of leather. However, the effect of entire crusting operations (post tanning) on the mechanical properties is not documented. This study reports the findings of the effect of crusting operations (retanning, dyeing and fatliquoring) on the mechanical properties of the final leather. Results have shown that retanning process improves tear and tensile strengths, distensions at crack and burst, and shrinkage temperature. An improvement in the organoleptic properties such as fullness was recorded in retanned crust leather. However, the uniformity coefficient and percentage elongation significantly decreased after retanning. Dyeing raises the elongation at break, distensions at crack and burst, shrinkage temperature and uniformity coefficient whereas both tensile and tear strengths decreased after dyeing. Similarly, fatliquored samples recorded higher elongation at break values, and distension values. Conversely, tensile and tear strengths, shrinkage temperature and uniformity coefficient decreased as a result of fatliquoring process. All the samples tested at tanning, retanning, dyeing and fatliquoring processes indicated no damage at 50,000 flexes. The study discussed these effects using transmission of fracture and damage mechanics in leather, structural implication of the resulting leather and existing models of materials. KEYWORDS: physical properties, crusting operations, leather anisotropy and uniformity, fracture and damage mechanics, micromechanical deformation, stress concentration EFECTUL OPERAŢIUNILOR DE FINISARE UMEDĂ ASUPRA PROPRIETĂŢILOR MECANICE ALE PIELIIREZUMAT. Proprietăţile fizice ale pielii constituie parametri de calitate importanţi care determină caracteristicile de performanţă ale pielii în domeniile în care vor fi utilizate. Cu toate acestea, transformarea pieii crude în piele finită implică o serie de modificări chimice şi fizicomecanice care afectează proprietăţile mecanice ale pielii. Au fost publicate multe cercetări privind efectul prelucrării asupra proprietăţilor mecanice ale pielii. Cu toate acestea, efectul ansamblului de operaţiuni de finisare umedă (post-tăbăcire) asupra rezistenţei mecanice nu este documentat. Acest studiu prezintă constatările privind efectul operaţiunilor de finisare umedă (retăbăcire, vopsire şi ungere) asupra proprietăţilor mecanice ale pieii finite. Rezultatele au arătat că procesul de retăbăcire îmbunătăţeşte rezistenţa la rupere şi la sfâşiere, alungirea la crăpare şi rupere şi temperatura de contracţie. S-a înregistrat o îmbunătăţire a proprietăţilor organoleptice, cum ar fi plinătatea, la pielea retăbăcită şi finisată umed. Cu toate acestea, coeficientul de ...

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“…al., and they reported that the retanning agent possessing lower hydrophilic character provided the higher dry heat resistance in leather (Wu et al, 2013). Recently, visco-elastic behavior of leather was pursued by several workers (Langroudia et al, 2012;Liu et al, 2007). Few workers reported the effect of biaxial stretching upon the fibre orientation and associated tensile modulus, and they noted that the fibre reorientation factor is a major cause behind change in the tensile modulus (Sturrock et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Influence of the micro-structural factors upon thermal and mechanical properties of various bag leathers

Mondal¹,

Chattopadhyay²

2017

Bangladesh J. Sci. Ind. Res.

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Four different bag leathers, such as, Sheep Bag Leather (SBL), Buffalo Vegetable Tanned Leather (BVTL), Cow Drum Dyed Dry Milled Leather (CDDDML), and Cow Crocodile Print Leather (CCPL), were processed by different methods from respective wet-blues of Indian origin. Thermal degradation profile and mechanical properties of the samples were evaluated, and crosslink densities of each sample were measured by fitment of Mooney-Rivlin equation on stress-strain plots. Morphological characteristics (e.g. fibre structure, fibre thickness, splitting etc.) of all the specimens were investigated by image analyses of SEM photomicrographs. The highest crosslinking density for BVTL was attributed to its higher fibre and fibril thicknesses coupled with rigorous retanning by vegetable tannins and syntans. Embossing at higher temperature and pressure reduced CCPL's elongation-at-break value and hence stretchiness possibly due to the development of set properties within the CCPL matrix. SBL was noted to contain huge void spaces that increased its stretchiness, and melamine formaldehyde syntans showed pronounced influence in increasing the thermal resistance of both CCPL and CDDDML.

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Viscoelasticity studies for a fibrous collagen material: chrome-free leather

Cited by 21 publications

References 3 publications

Biodegradable composites from polyester and sugar beet pulp with antimicrobial coating for food packaging

Biodegradable composites from polyester and sugar beet pulp with antimicrobial coating for food packaging

Effect of Crusting Operations on the Physical Properties of Leather

Influence of the micro-structural factors upon thermal and mechanical properties of various bag leathers

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