Characterization of polyurethane foam as heat seal coating in medical pouch packaging application

Abstract

In this study the use of polyurethane foam (PUF) as a heat seal coating for potential application in medical pouch packaging were investigated. We prepared PUF coatings at various foam densities and cell densities through mechanical foaming at various stirring speeds; then used a LUMisizer to examine their stabilities. After applying PUF coatings of various foam densities onto a medical packaging material (Tyvek®) at various thicknesses, then employed impulse heat sealing with linear low density polyethylene (LLDPE) films to fabricate medical pouches. In addition to investigating the morphology, tack properties, adhesion, scratch resistance, flexibility, and durability of the PUF coats, the peel strength and air permeability of the medical pouches were also measured. Increasing the foam density of the PUF coatings increased their stability; the PUF coats prepared at a higher foam density exhibited greater tackiness (<1 g/cm 2 ), adhesion (5B), scratch resistance (HB), flexibility (passes), and durability (ΔYI≤5). The peel strength measured in the T-peel configuration increased upon increasing the foam density and decreasing the coating thickness of the PUF coat/LLDPE pouches. The air permeability of the pouches increased upon increasing the foam density and cell density of the PUF coat/LLDPE pouches. Morphological studies using scanning electron microscopy were consistent with the experimental results.

The Effect of Coating Process and Additives on EVA Coated Tyvek® for Gas Sterilizable Medical Packaging Applications

“…Each sample exhibited a 180 o peel strength ranging from 0.13 to 0.14 kg f /5 mm depending on the citric acid concentration. In total, all EVA emulsion coated sheets prepared by pre‐coating with citric acid exhibited good adhesion to Tyvek ® sheets, which were comparable with peel strengths in the range of 0.09–0.27 kg f /5 mm for medical device packaging materials . Considering the air permeability and seal strength of as‐prepared coated Tyvek ® sheets, hereafter, further examinations of the effect of various additives were performed by pre‐coating with 15 PBW citric acid prior to coating with the emulsion solution.…”

“…SEM images of coated Tyvek ® sheets as a function of citric acid content. materials4,14 . Considering the air permeability and seal strength of as-prepared coated Tyvek ® sheets, hereafter, further examinations of the effect of various additives were performed by pre-coating with 15 PBW citric acid prior to coating with the emulsion solution.…”

Application of Inorganic Solidified Foam to Control the Coexistence of Unusual Methane Emission and Spontaneous Combustion of Coal in the Luwa Coal Mine, China

“…(15)(16)(17) The organic materials mainly contain polymer gel, foam gel, polyurethane foam, etc. (18)(19)(20) They play an active role in the process of sealing air leakage; however, some shortages still exist: such as fly ash, the fly ash slurry only flows along the low-lying fracture channels and it cannot uniformly permeate into the mining fractures in higher places; colloid mud, it accompanies the shortages of poor liquidity, difficult to convey for long distance; composite Preprints (www.preprints.org) | NOT PEER-REVIEWED | Posted: 1 August 2018 doi:10.20944/preprints201808.0021.v1…”

Polyurethanes based on thermoreversible networks designed by Diels-Alder reaction

“…The need for PUs steadily increased ever since then, because of its high abrasion, chemical resistance, flexibility, and good mechanical property [1]. Nowadays they are considered one of the most versatile polymeric materials class since they can be used in many forms and in a large number of applications including elastomers [2][3][4][5], flexible and rigid foams [6][7][8], biomedical applications [9][10][11], adhesives and coatings [12][13][14], polymers for electronics [15], etc. The reaction between diisocyanates or multiisocyanates and di-or polyols generates polyurethanes with different molecular structures varying from linear to crosslinked ones depending on the structure, functionality and stoichiometry of the reactants.…”