Plastic article or earthenware shaping or treating: apparatus – Means making particulate material directly from liquid or... – By means applying fluid jet or blast to unconfined liquid...
Reexamination Certificate
1999-05-04
2001-06-12
Heitbrink, Tim (Department: 1722)
Plastic article or earthenware shaping or treating: apparatus
Means making particulate material directly from liquid or...
By means applying fluid jet or blast to unconfined liquid...
C425S072200
Reexamination Certificate
active
06244845
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a die nosepiece for use in textile processes involving nonwoven melt blow fabrics. In a melt blown process, molten polymer resins are injected into a melt blown die and ejected from the die in the form of filaments. The present invention is directed to an improved die nosepiece comprising a slit with serrated edges through which resin filaments are ejected.
2. Description of the Prior Art
Prior art nosepieces for dies used in the melt blowing process comprise parallel holes through which resin filaments are ejected. These holes may be formed by drilling or by electric discharge machining (EDM). Multihole dies are expensive to fabricate. The present invention provides a melt blown die that is less expensive to fabricate than prior art dies.
There is also a limit regarding how small holes can be formed in prior art dies. The serrated slit of the present invention can also be made narrower than hole diameters can be made small in prior art dies comprising parallel holes.
SUMMARY OF THE INVENTION
The present invention is directed toward a die nosepiece for a melt blowing device. The present invention comprises a body defining a resin receiving volume. The body further comprises a front section. The invention comprises a resin inlet in fluid communication with the resin receiving volume.
The invention further comprises a slit extending across the front section of the body. The slit comprises a first side and a second side. A serrated first edge is mounted on the front section adjacent the first side of the slit. A serrated second edge is mounted on the front section adjacent the second side of slit.
REFERENCES:
patent: 3806289 (1974-04-01), Schwarz
patent: 5017112 (1991-05-01), Mende et al.
patent: 5098636 (1992-03-01), Balk
Buntin Robert R.
Milligan Mancil W.
Duane Morris & Heckscher LLP
Heitbrink Tim
Leyson Joseph
The University of Tennessee Research Corporation
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