Particle-containing fibrous web

A fiber web, non-woven fiber web technology, applied in the separation of dispersed particles, cellulose plastic material layered products, filters for breathing, etc., can solve the problems of large sample variability, large accumulation volume and short service life

Inactive Publication Date: 2009-05-20
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fibrous webs packed with sorbent particles typically have lower pressure drop than packed beds, but may also have shorter lifetimes, larger bulk volumes, or greater sample-to-sample variability

Method used

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  • Particle-containing fibrous web
  • Particle-containing fibrous web
  • Particle-containing fibrous web

Examples

Experimental program
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Effect test

example 1

[0085] Utilizes a meltblown device with a single horizontal strand stream (as shown in Figure 6), a polymer melt temperature at 230-300°C (depending on the polymer and desired fiber specification), a die drilled with holes, and At a distance of 32 cm from the mold to the collector, a mold width of about 300 g / hour / cm was used (for the thermoplastic polyurethane used in Test No. 2, see Table 1 below) and about 230 g / hour / cm A series of carbon-loaded meltblown nonwoven webs were prepared from various fiber-forming polymeric materials extruded at a die width of cm (as shown in Table 1 for the remainder of the polymeric material). The temperature and air velocity of the extruder (and other processing parameters as needed) were adjusted to obtain a web having an effective fiber diameter ("EFD") of about 16 to 29 microns, with most webs having about 20 to 29 µm EFD. According to the method set forth in "Separation of Airborne Dust and Particles" in Bulletin No. 1B, "Separation of A...

example 2

[0098] Various thermoplastic polymers were pressed into discs by pressing extrusion grade pellets obtained from polymer manufacturing plants in a heated laboratory hydraulic press (available from Carver Corporation). The press is equipped with a stainless steel plate covered with a Teflon liner. The thickness of the disc was adjusted using a bump stop made of feeler gauge stock of 0.5 mm. The temperature of the press depends on the particular polymer being pressed, but is generally set at about 200-250°C. A pressure of about 207 kPa and a compression time of about 15 seconds was employed. The resulting resin coupons were folded over and re-pressed until air gaps and other imperfections were removed to form discs of target dimensions of approximately 50 mm diameter and 0.5 mm thickness. The discs were placed in a desiccator and arranged to be evenly exposed to the interior air of the desiccator. A sufficient amount of DMMP to provide a saturated internal atmosphere was also ...

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Abstract

A porous sheet article including a self-supporting nonwoven web of less than 20 weight percent polymeric fibers exhibiting no more than about 1 weight percent dimethyl methyl phosphonate uptake and at least 80 weight percent sorbent particles enmeshed in the web, the sorbent particles being sufficiently evenly distributed in the web and the fiber polymer(s) being such that the web has an Adsorption Factor A of at least 1.6x10<4> / mm water. The articles have low pressure drop and can provide filter elements and other individual or collective protection devices having long service lives and an Adsorption Factor approaching and in some instances exceeding that of a packed carbon bed.

Description

[0001] Cross references to related patent applications [0002] This patent application is a continuation-in-part of co-pending patent application Ser. No. 10 / 983,770, filed November 8, 2004, the entire disclosure of which is incorporated herein by reference. technical field [0003] The present invention relates to fiber webs containing particles and filter devices. Background technique [0004] Respirators used in the presence of solvents and other hazardous airborne substances sometimes employ filter elements that contain sorbent particles. The filter element may be a filter cartridge comprising a bed of sorbent particles, or a layer or insert of filter material impregnated or coated with sorbent particles. The design of a filter element can involve balancing sometimes conflicting factors such as pressure drop, shock resistance, overall service life, weight, thickness, overall size, resistance to potentially damaging forces such as vibration or wear Force and sample-to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B23/10
CPCD04H1/42D04H1/565A62B23/02D04H1/407D04H1/4291D04H1/4374D04H1/56B01D53/02B32B23/10
Inventor 约翰·E·特伦德菲利普·G·马丁拉里·A·布雷马尔文·E·琼斯拉里·A·舒曼杜安·D·范斯勒布里顿·G·比林斯利托马斯·I·英斯利
Owner 3M INNOVATIVE PROPERTIES CO
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