Tear resistance isanotherimportant issuewithinpackaging field giving information about the required strength to open the package when it is torn. Generally, materials present different tearing
behavior. Some of them may be quite resistant to tear when they are in their full form, but when a pre-cut slit is made, they become susceptible and the effort needed to propagate the tear is lower.
Fig. 4 shows load-time curves corresponding to TPS and TPS with 5% w/w talc particles, as well as, specimen photographs after they were tested. According to ASTM D 1938-02 standard test method,
load dependence with time indicates that TPS based materials could be associated to low extensible films. Although talc incor-poration did not modify tear propagation pattern of TPS, reinforced
materials presented higher average tear propagation force thanTPS matrix. Normalized load required to propagate tear across starch films without talc particles resulted 0.31 ? 0.02 kgf/mm while for
TPS bionanocomposites with 5% w/w talc was 0.44 ? 0.02 kgf/mm. This increment of 1.4 times is attributed to the presence of mineral particles which act as reinforcement agent of TPS matrix. Tear
propagation forces presented the same order of magnitude than those reported by Wawro and Kazimierczak (2008) for potato starch films. Othereffect on this mechanical propertycaused bytalc
presence was evidenced through the visual analysis of the direction
Tear resistance isanotherimportant issuewithinpackaging field giving information about the required strength to open the package when it is torn. Generally, materials present different tearing
behavior. Some of them may be quite resistant to tear when they are in their full form, but when a pre-cut slit is made, they become susceptible and the effort needed to propagate the tear is lower.
Fig. 4 shows load-time curves corresponding to TPS and TPS with 5% w/w talc particles, as well as, specimen photographs after they were tested. According to ASTM D 1938-02 standard test method,
load dependence with time indicates that TPS based materials could be associated to low extensible films. Although talc incor-poration did not modify tear propagation pattern of TPS, reinforced
materials presented higher average tear propagation force thanTPS matrix. Normalized load required to propagate tear across starch films without talc particles resulted 0.31 ? 0.02 kgf/mm while for
TPS bionanocomposites with 5% w/w talc was 0.44 ? 0.02 kgf/mm. This increment of 1.4 times is attributed to the presence of mineral particles which act as reinforcement agent of TPS matrix. Tear
propagation forces presented the same order of magnitude than those reported by Wawro and Kazimierczak (2008) for potato starch films. Othereffect on this mechanical propertycaused bytalc
presence was evidenced through the visual analysis of the direction
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