| 摘要 |
<p>A needle-bonded fibrous structure (P) is created by piling up fibrous strata on a platform (100), needle-bonding the 5 strata as they are gradually piled up using needles (114) which are activated in an alternative movement in a transversal direction in relation to said strata, and varying the distance separating the platform from an end of travel position of said needles during the piling up process in order to obtain a desired distribution of needle-bonding characteristics in the thickness of the fibrous structure. The instantaneous effort (f) which is exerted during penetration of said needles is measured (sensors 108) in order to evaluate a variable representing a needle-bonding effort (F) or penetration power (E) on the basis of said instantaneous effort. The variable (F; E) is verified in order to ascertain if it meets at least one predetermined condition in order to control smooth operation of the process or to act on the variation of the distance between the platform and the end of travel position of the needles.</p> |
