| 摘要 |
<p>In spunbonded webs of thermoplastics, which have a higher tensile strength in one direction than in the direction at right angles thereto, the tensile strengths are approximated to one another by stretching these webs, in which the filaments are in approximately random arrangement, and which have been consolidated by needle-punching, by 20 - 200% of the original length, in the direction of the lower tensile strength, at temperatures which are 85 - 25.degree.C below the crystallite melting point, whilst either maintaining the length,or changing it by an amount within the range of + 10%, in the direction at right angles to the stretching direction. O.Z.667/671</p> |
