| 摘要 |
food wrapping up. SUBSTANCE: tubular film contains material regenerated from viscose solution. Tubular material is stretched in longitudinal direction by +10-+40%. It is stretched in transverse direction by -20-+40% in wet state. Stretching is continued in process of drying. Longitudinal and transverse stretching is sufficient for increase in surface area by at least 10%, as compared with surface area just after regeneration. Thickness of tubular material wall makes up from about 60 to about 90% of value for the same tubular material but without combined stretching. EFFECT: enhanced nonshrinkability and penetrability. 12 cl, 2 tbl, 6 ex, 2 dwg |
