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Respirator having a foam-shaping layer including a recessed area surrounding an air passageway

A respirator and forming layer technology, which is applied in the direction of respiratory protection containers, breathing filters, breathing masks, etc., can solve the problem that the filter layer cannot be replaced, and achieve the effect of rapid distribution and reduced pressure drop

Inactive Publication Date: 2016-11-30
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Discard said product once the respirator has reached the end of its useful life, as the filters in filtering facepiece respirators are not replaceable

Method used

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  • Respirator having a foam-shaping layer including a recessed area surrounding an air passageway
  • Respirator having a foam-shaping layer including a recessed area surrounding an air passageway
  • Respirator having a foam-shaping layer including a recessed area surrounding an air passageway

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0079] The cup masks of the present invention are made from two basic elements, a structural foam forming layer and a filter preform. The structural foam forming layer is prepared by first laminating two layers of material: an inner conformable layer and an outer structural layer. The material used for the outer structural layer is a closed-cell polypropylene foam sold by Yongbo Chemical, Daejeon-Si, Korea Q1001.1W. The apparent density and compressive strength of the outer structural layer are 0.1013g / cm 3 and 1.14kPa. The inner conformal layer material is closed-cell polyethylene foam also obtained from Yongbo Chemical in Daejeon, Korea R3003W. The apparent density and compressive strength of described foam are respectively 0.0322g / cm 3 and 0.32kPa. Lamination of these layers is done by flame lamination process.

[0080] Flame lamination involves exposing one face of the outer structural foam layer to a controlled flame in a continuous roll lamination process that h...

example 2

[0086] Example 2 was prepared according to Example 1 except that the resulting opening was a circular hole with a diameter of 5 mm. These holes are provided in the aforementioned recessed areas. There are approximately 80 holes in the twelve recessed areas. The openings in the mask body were approximately uniform in size and were determined to have an R of 1.3mm h scope. The EBO of the forming layer is about 15.7cm 2 . The openings accounted for about 26% of the total surface area of ​​the shaping layer.

example 3

[0088] Example 3 was prepared in the same manner as Example 1, except that a thermally bonded nonwoven web was used as the conforming layer. A total of 4 denier (dpf) low-melting fiber (51mm LMF4DE' from Huvis Corp., Seoul, Korea) and 6 denier polyester staple fibers (38mm RSF6DE' from Huvis Corp., Seoul, Korea) were used. The blend was prepared into a 200 gsm nonwoven web in a "Rando Webber" air-laying machine (from Rando Machine Corporation, Macedon, N.Y.). The composition of the blend was 70 weight percent 4dpf fibers and 30 weight percent 6dpf fibers. The loose web was thermally bonded by passing the loose web through a furnace at 120°C for 30 seconds.

[0089] The masks were evaluated for shatter resistance (stiffness), particle permeability and pressure drop. The test results are given in Table 1, which also includes the EBO value.

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PUM

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Abstract

A filtering mask 10 having a harness 14 and a mask body 12. The mask body 12 includes a filtering structure 18 and a cup-forming shaped layer 20, wherein the cup-shaped shaped layer includes a closed-cell foam layer with a plurality of fluid-permeable openings 22 positioned therein. The opening 22 is surrounded by a recessed area 31 . The filter structure 18 is substantially free of contact with the shaping layer 20 at the recessed area. The shaping layer 20 contacts the wearer's face at the mask body perimeter 19 when the respirator is worn by the wearer. Using a foam-shaping layer with an opening surrounded by a recessed area provides sufficient structural integrity or rigidity to inhibit collapse of the mask body during respirator use, while also exhibiting low pressure drop and loss of air within the mask. Rapid flow distribution to allow for low breathing resistance and enhanced wearer comfort.

Description

[0001] The present invention relates to filtering face-piece respirators having a foam-shaping layer with a series of openings positioned therein surrounded by regions recessed within the shaping layer. Background technique [0002] Respirators are typically worn over a person's airway for at least one of two common purposes: (1) to inhibit the entry of impurities or contaminants into the wearer's airway; Pathogens and other pollutants exhaled by the wearer. In the first case, the respirator is worn in an environment where the air contains particles harmful to the wearer, such as in a motor vehicle body shop. In the second case, respirators are worn in environments where there is a possibility of contamination of other people or things, such as in operating theaters or clean rooms. [0003] Some respirators are classified as "filtering masks" because the mask body itself serves as the filtering mechanism. Combined with the use of attachable filter cartridges or filter liners...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62B18/02A62B23/02A62B7/10A62B9/00
Inventor 李珍浩文正喆朴康守鲁东宣
Owner 3M INNOVATIVE PROPERTIES CO