초록

Modular die constructions includes a plurality of side-by-side self-contained, interchangeable meltblowing modules on a manifold so that the length of the die can be varied by adding modules or removing modules from the manifold.

대표청구항 ▼

A modular meltblowing die comprising: a. a manifold having a polymer flow passage and an air flow passage formed therein; and b. a plurality of self-contained die modules mounted in side-by-side relationship on the manifold, each module having (i) a body having a polymer flow passage and an air flow

A modular meltblowing die comprising: a. a manifold having a polymer flow passage and an air flow passage formed therein; and b. a plurality of self-contained die modules mounted in side-by-side relationship on the manifold, each module having (i) a body having a polymer flow passage and an air flow passage formed therein, which are, respectively, in fluid communication with the polymer flow passage and the air flow passage of the manifold, (ii) a die tip assembly comprising (1) a die tip having a base portion mounted on the module body and a triangular nosepiece protruding outwardly from the base in a direction away from the module body and terminating in an apex extending substantially the full width of the module body, said apex having formed therein polymer discharge means for discharging a row of filaments therefrom, said die tip base having formed therein a polymer flow passage in fluid communication with the polymer flow passage of the die body and being shaped to distribute the polymer laterally within the die tip for substantially the full width of the module and deliver polymer to the polymer discharge means, and air flow passages in fluid communication with the air flow passage of the body and extending through the die tip base; (2) air plates mounted on opposite sides of the nosepiece and therewith defining converging air slits, each air slit being in fluid communication with an air flow passage of the die tip base; and (iii) an internal valve mounted in each module die body for controlling polymer flow therethrough, said modules mounted on the manifold in side-by-side relationship the nosepieces thereof defining a substantially continuous or discontinuous apex for the full length of the meltblowing die.