One-step melt blowing process for PP/PEG micro-nanofiber filters with branch networks

One-step melt-blowing of multi-scale micro/nano fabric membrane for advanced air-filtration

Polymer ◽

10.1016/j.polymer.2019.01.035 ◽

2019 ◽

Vol 165 ◽

pp. 174-179 ◽

Cited By ~ 19

Author(s):

Nanping Deng ◽

Hongsheng He ◽

Jing Yan ◽

Yixia Zhao ◽

Eya Ben Ticha ◽

...

Keyword(s):

Air Filtration ◽

Melt Blowing ◽

Multi Scale ◽

One Step

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The History of the Development of Melt Blowing Technology

International Nonwovens Journal ◽

10.1177/1558925099os-800123 ◽

1999 ◽

Vol os-8 (1) ◽

pp. 1558925099OS-80 ◽

Cited By ~ 8

Author(s):

John G. McCulloch

Keyword(s):

Melt Spinning ◽

State Of The Art ◽

Nonwoven Fabric ◽

Naval Research ◽

Melt Blowing ◽

Current State ◽

Spinning Process ◽

History Of ◽

One Step ◽

Oil Company

Almost a half century ago development efforts were initiated by very different entities, in widely different locations, to demonstrate one step processes to convert polymer to web: • Major fiber producers (DuPont, Freudenberg, Monsanto) began work on converting polymer (PE, PET, Nylon) into continuous “cold drawn” filaments and integrating the conversion of these filaments into a random-laid bonded nonwoven fabric. • An oil company (Exxon), building on the earlier work (1950's) of the Naval Research Labs to produce fine fibers, began work on converting their recently commercialized PP polymer into discontinuous, or continuous, “hot drawn” filaments and integrating these filaments into a random-laid self bonded nonwoven web having average fiber sizes 2–5 microns (fine fibered webs) to 100+ fibers (coarse fibered webs). As a result of these early development efforts, three different, but related melt spinning nonwoven processes have achieved significant commercial importance, with tremendous benefits to consumers worldwide: • Spunbond process • Melt blowing process • Flash spinning process This presentation will summarize the development of the melt blowing process from conceptualization to current state-of-the-art. Important product, process and equipment developments are detailed in the 50 year growth of the melt blowing process from a laboratory concept to a 125 million pound a year U.S. and Canadian commercial business and substantial additional worldwide consumption. Today, spunbond and melt blown processes are used for approximately 54% of the total 18.6 million square yards U.S. nonwoven market.

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Novel Multi-Layer Melt Blown Microfiber Webs

MRS Proceedings ◽

10.1557/proc-702-u5.9.1 ◽

2001 ◽

Vol 702 ◽

Author(s):

Eugene G. Joseph

Keyword(s):

Research Laboratory ◽

Extrusion Process ◽

Naval Research Laboratory ◽

Naval Research ◽

Melt Extrusion ◽

Melt Blowing ◽

Ultrafine Fibers ◽

One Step

Melt blowing is a melt extrusion process that allows us to start with a material in resin form and obtain a final web product in one step. The fine fibers that are characteristic of this process are in the 0.1 to 15 micron range in diameter. This process was first described in the literature by Wente of the Naval Research Laboratory in 1956 [1] and the purpose of the work was to investigate the feasibility of making ultrafine fibers for evaluation as a filtermedia. Since then melt blowing has been one of the fastest growing technologies in the non-wovens area as evidenced by the numerous articles in the literature and the number of issued patents. For example, an article by McCulloch and Graham [2] illustrated the diverse use of melt blown webs which are also referred to as Blown Micro Fiber(BMF) webs.

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An Interactive Minicomputer Program for the Indexing and Simulation of Electron Diffraction Patterns

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100092670 ◽

1976 ◽

Vol 34 ◽

pp. 542-543

Author(s):

R.P. Goehner ◽

W.T. Hatfield ◽

Prakash Rao

Keyword(s):

Electron Diffraction ◽

Real Time ◽

Pattern Analysis ◽

Flow Diagram ◽

Hard Copy ◽

Time Analysis ◽

Real Time Analysis ◽

Transmission Electron ◽

One Step ◽

Diffraction Patterns

Computer programs are now available in various laboratories for the indexing and simulation of transmission electron diffraction patterns. Although these programs address themselves to the solution of various aspects of the indexing and simulation process, the ultimate goal is to perform real time diffraction pattern analysis directly off of the imaging screen of the transmission electron microscope. The program to be described in this paper represents one step prior to real time analysis. It involves the combination of two programs, described in an earlier paper(l), into a single program for use on an interactive basis with a minicomputer. In our case, the minicomputer is an INTERDATA 70 equipped with a Tektronix 4010-1 graphical display terminal and hard copy unit.A simplified flow diagram of the combined program, written in Fortran IV, is shown in Figure 1. It consists of two programs INDEX and TEDP which index and simulate electron diffraction patterns respectively. The user has the option of choosing either the indexing or simulating aspects of the combined program.

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Nutrient-regulated gene expression in eukaryotes

Biochemical Society Symposium ◽

10.1042/bss0730085 ◽

2006 ◽

Vol 73 ◽

pp. 85-96 ◽

Cited By ~ 8

Author(s):

Richard J. Reece ◽

Laila Beynon ◽

Stacey Holden ◽

Amanda D. Hughes ◽

Karine Rébora ◽

...

Keyword(s):

Gene Expression ◽

Rna Polymerase ◽

Rna Polymerase Ii ◽

Transcriptional Control ◽

Direct Interaction ◽

Signalling Pathways ◽

A Cell ◽

One Step ◽

Higher Eukaryotes ◽

Regulated Gene Expression

The recognition of changes in environmental conditions, and the ability to adapt to these changes, is essential for the viability of cells. There are numerous well characterized systems by which the presence or absence of an individual metabolite may be recognized by a cell. However, the recognition of a metabolite is just one step in a process that often results in changes in the expression of whole sets of genes required to respond to that metabolite. In higher eukaryotes, the signalling pathway between metabolite recognition and transcriptional control can be complex. Recent evidence from the relatively simple eukaryote yeast suggests that complex signalling pathways may be circumvented through the direct interaction between individual metabolites and regulators of RNA polymerase II-mediated transcription. Biochemical and structural analyses are beginning to unravel these elegant genetic control elements.

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