Includes a semi-crystalline polymer fibers that are capable of softening orientation apparatus and method for preparing a bonded nonwoven fiber web and such web

摘要

In short the web a fluid heated to the melting start temperature of the polymeric material providing step, at least 2) a) a nonwoven fibrous web comprising a semi-crystalline polymer fibers are oriented, in order to melt a whole of the fiber By the web of fluid lower 50 ℃ least, process time, passing strongly, and b) the temperature passes strongly than the nominal melting point of the material of the fibers, the step of quenching rapidly the web a method of making comprising the step of subjecting the web to heating and quenching operations are controlled, the nonwoven fibrous web is bonded. Fiber web processed softening of phase with the phase characteristic with the amorphous nature of exhibiting in general, a) to allow softening (fibers i) repeatable softening, and ii) amorphous There is that, it has a phase having the properties of crystallites reinforcing fiber structure, the fiber retains the fiber structure and orientation as soon as the self-adhesive thereby. Apparatus for carrying out the method includes a chamber having a wall facing a) the web and is mounted on a proximal side of the first conveyor for conveying a web to be 1) processing, 2) conveyor, through the web on the conveyor through which the chamber, the gas can be a gas that is b) heating, is introduced into the chamber under pressure through which one or more conduits, and is c) heating of the chamber located in the down-web direction from the heater on the side of the first heater with a slot in the wall, and 3) conveyor, having a temperature substantially lower than the heated gas, the source of quench gas, quench gas and A gas recovery means arranged opposite on the side of the second conveyor 4) heater portion that is aligned with the slot to draw heated gas from the slot through the web, and also, To quench the web, it is aligned with the source of quenching gas to draw a quenching gas through the web, it is possible to include and a portion of the down-web direction from the slot, the gas recovery means. Preferably, in order to equalize the distribution of gas through the web, in the path of one flow restriction means is arranged on the side of the second conveyor at least the quenching gas and the heated gas.