| 摘要 |
A filling material composed of crimped fibres of length not exceeding 50 mm joined together at one end with a specified high density, and having 3 to 25 crimps per inch located in mutually deviating phases, while the other ends of the fibres stay free, exhibits superior bulkiness and thermal insulation, since the recovery force or resiliency of the crimps located in mutually deviating phases causes the fibres to spread sufficiently to define a large layer of air among themselves. The materials are manufactured by opening a tow of suitably crimped fibres (1), compressing one end (2) of the opened tow to the desired degree, cutting (3) that end of the tow and joining the fibres at that end by melting (4) or solvent adhesion, cutting the tow to its desired length while still compressed and then releasing the compression, and continuously repeating these steps. |
