The ratio between the 5% elongation stress in the longitudinal direction and the 5% elongation stress in the transversal direction is at least 1.66.
In the layered non-woven fabric, the 5% elongation stress in the longitudinal direction is 10-50N/5cm, and the 5% elongation stress in the transversal direction is no more than 15N/5cm.
The elastic area (47) has a lower elongation stress in the crosswise direction than the elastic areas (45) and (46).
The planar elongational stress (σ) is divided by planar elongational rate (ϵ’) to thereby determine planar elongational viscosity (ηPE).
The critical point radius x*, at which the polymer melt (3) is brought to an oriented crystal, is measured, and the critical elongation strain rate ϵ* is calculated by equation ϵ* = ax*3 wherein α = v/(2 z0x03).
The percent change in air permeability of the thermoplastic resin composition in the present invention when subjected 1 million times to 20% elongation strain at room temperature is 1.30 times or more.
The film can exhibit a modulus of not less than about 1 MPa, and may also exhibit an elongation strain at break of at least about 100 % in both its machine and transverse directions.
Requêtes fréquentes français :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
Requêtes fréquentes anglais :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
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