公开(公告)号：US3849241A

公开(公告)日：1974-11-19

申请号：US22776972

申请日：1972-02-22

Applicant: EXXON RESEARCH ENGINEERING CO

Inventor： BUTIN R ,  KELLER J ,  HARDING J

IPC: D01D5/098 ,  D04H3/16

CPC classification number: D04H1/724 ,  D01D5/0985 ,  D04H3/007 ,  D04H3/16 ,  Y10T428/24322

Abstract: Melt blown non-woven mats prepared from thermoplastic polymer fibers and substantially completely free of polymer shot are produced at high polymer throughput rates in an improved melt blowing process in which thermoplastic polymer resins, preferably polypropylene, having initial intrinsic viscosities of at least 1.4, are degraded, optionally in the presence of a free radical source compound, to have both reduced intrinsic viscosities and an apparent viscosity in the melt-blowing nozzle orifices of from about 50 to about 300 poise.

Abstract translation: 在热塑性聚合物纤维中制备的基本上完全不含聚合物射流的熔喷无纺毡在改进的熔喷法中以高聚合物生产速率生产，其中具有至少1.4的初始特性粘度的热塑性聚合物树脂，优选聚丙烯是 任选在存在自由基源化合物的情况下降解，使熔融喷嘴孔中的特性粘度和表观粘度均降低约50至约300泊。

公开(公告)号：US3825380A

公开(公告)日：1974-07-23

申请号：US26962472

申请日：1972-07-07

Applicant: EXXON RESEARCH ENGINEERING CO

Inventor： HARDING J ,  KELLER J ,  BUNTIN R

IPC: D01D5/08 ,  B29C47/12 ,  B29C47/30 ,  D01D5/098 ,  D04H1/56 ,  D04H3/03 ,  B29F3/04

CPC classification number: D01D5/0985 ,  B29C47/0021 ,  B29C47/12 ,  B29C47/30 ,  D04H1/56

Abstract: A die having a special nose configuration approximating a triangle in cross section is especially suitable for use in a melt-blowing process for making very fine fibers from thermoplastic materials. A plurality of orifices are located in an edge-apex formed at the juncture of two sides of said triangle. The included angle encompassing said edge is within the range of 30* to 90*. The essential feature of said edge is that there are essentially no dead spaces where polymer can collect during the melt-blowing process. Any point on the edge which is more than about 0.002 inches (2 mils) from where the sides make initial contact with said edge is considered to be a dead space. Another feature of the invention involves air slot adjustment means in combination with said die nose.

公开(公告)号：US3755527A

公开(公告)日：1973-08-28

申请号：US3755527D

申请日：1969-10-09

Applicant: EXXON RESEARCH ENGINEERING CO

Inventor： KELLER J ,  PRENTICE J ,  HARDING J

IPC: D01D5/098 ,  D01D5/12 ,  D04H3/16

CPC classification number: D04H3/16 ,  D01D5/0985 ,  D01D7/00

Abstract: A HIGHLY TEAR RESISTANT NONWOVEN MAT OF THERMOPLASTIC POLYMER FIBERS IS MADE IN A MELT-BLOWING PROCESS IN WHICH A MOLTEN POLYMERIC RESIN IS EXTRUDED THROUGH A ROW OF DIE OPENINGS INTO A STREAM OF HOT GAS WHICH ATTENUATES THE RESIN INTO FIBERS HAVING DIAMETERS BETWEEN ABOUT 10-40 MICRONS. THE FIBERS ARE COLLECTED ON A CONTINUOUSLY MOVING SURFACE POSITIONED FROM ABOUT 10 TO ABOUT 30 INCHES FROM THE DIE OPENINGS.