Title:
透湿防水シート
Document Type and Number:
Japanese Patent JP6925826
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a moisture permeable waterproof sheet which has high infrared reflectivity and strength and has the infrared reflectivity over a long period of time while having waterproofness, moisture permeability and air permeability equivalent to or higher than conventional one.SOLUTION: A moisture permeable waterproof sheet includes a resin film 10, an aluminum foil 20 and a non-woven fabric 40 in this order, where the aluminum foil and the resin film have a plurality of communicating through holes 50, an opening ratio of the through holes is 1.2% or more and 7.0% or less, in the aluminum foil, at least on a surface facing the resin film, a ratio of the total surface area of a crystallized product existing on the predetermined surface area is 2% or less, an average surface area per one crystallized product is 2 μmor less, surface roughness Rz in a direction vertical to a rolling direction is 40 nm or less and surface roughness Ra is 10 nm or less, in a non-woven fabric, span bond layers 42 and 42 are stacked on both surfaces of a melt-blown layer 44, and the melt-blown layer has a density of 0.26 g/cmor more and 0.7 g/cmor less.SELECTED DRAWING: Figure 1
Inventors:
Hisao Karasawa
Keiichi Nakagawa
Mitsunari Oyagi
Shingu
Yoichi Sato
Ken Yamashita
Keiichi Nakagawa
Mitsunari Oyagi
Shingu
Yoichi Sato
Ken Yamashita
Application Number:
JP2017041439A
Publication Date:
August 25, 2021
Filing Date:
March 06, 2017
Export Citation:
Assignee:
Toyo Aluminum K.K.
Jsoft Corporation
Jsoft Corporation
International Classes:
B32B5/26; B32B15/08; B32B15/14; B32B15/20; B32B27/02; B32B27/12; B32B27/32; B32B27/34; B32B27/36; E04B1/66
Domestic Patent References:
| JP2011219918A | ||||
| JP2005059506A | ||||
| JP5193037A | ||||
| JP2010064296A |
Foreign References:
| WO2015019960A1 |
Attorney, Agent or Firm:
Maeda patent office