Stock material or miscellaneous articles – Hollow or container type article – Glass – ceramic – or sintered – fused – fired – or calcined metal...
Patent
1991-03-25
1993-04-27
Bell, James J.
Stock material or miscellaneous articles
Hollow or container type article
Glass, ceramic, or sintered, fused, fired, or calcined metal...
428284, 428286, 428288, 428297, 428298, 428903, B32B 108
Patent
active
052060616
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a dust-proof headgear having an extremely high dust-proof effect with a relatively simple construction and capable of producing a remarkable effect of a prevention of scattering of hair, dandruff and dust while allowing a high air permeability, to ensure that the wearer does not suffer from a feeling of overheating or stuffiness even after the headgear is worn for a long time. The headgear of the present invention can be effectively used in a variety of industrial fields which require such dust-proof headgear.
2. Description of Related Art
Hitherto, simple headgear, generally referred to as air caps or clean caps and made of a non-woven fabric having a high air permeability, have been used by workers working in environments which require a strict exclusion of dust, such as in the foodstuff industry, electronic industry, precision machining industry and pharmaceutical industry, as well as in the medical field.
The conventional headgear, however, undesirably allow hair, dandruff and dust to be scattered through the highly air-permeable non-woven fabric, with the result that the working environment, and the matters processed in such environments, are seriously contaminated.
Headgear made of a woven fabric having no air permeability, to completely block dust and other contaminants, are also known, but this headgear imparts an unpleasant feeling to the wearer because the wearer's head becomes hot or stuffy when such headgear is worn for a long time.
Therefore, it is common knowledge that air permeability and a dust-proof performance are generally incompatible in headgear of the kind described above.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a dust-proof headgear having a high air-permeability enough to substantially avoid any feeling of heat or stuffiness even when worn or a long time, but exhibiting an excellent dust-proof performance.
Therefore, the present invention provides a headgear having the following features.
Namely, the dust-proof headgear of the present invention is made of a material having, as a major component thereof, an electret non-woven fabric having a surface electrostatic charge density not lower than 1 .times.10.sup.-10 Coulomb/cm.sup.2 and an air-permeability of between 10 cc/cm.sup.2. sec. and 1000 cc/cm.sup.2.sec
The headgear of the present invention has a relatively simple construction and exhibits an excellent air-permeability, and in addition, produces a remarkable dust-proof effect in that hair, dandruff, dust and so forth free in the headgear are effectively adsorbed and trapped by a multiplication of effects, i.e., an electrostatic adsorption effect possessed by the electret material and a mechanical filter effect of the same, thus preventing the captured contaminant from being scattered outside the headgear.
Therefore, the headgear of the present invention can be used without a feeling of sultryness, and without causing environmental contamination, and thus the headgear of the present invention has superior characteristics as a dust-proof headgear.
Accordingly, the headgear of the present invention is suitable for use in various working rooms, such as clean rooms, surgical operating rooms, pharmaceutical production rooms, kitchens of restaurants, food production factories, and working rooms of hygenic industries, electronic industries, precision machining industries and so forth, as well as environments where contamination by contaminants from the heads of workers or habitants must be strictly avoided.
The electret non-woven fabric used as the material of the headgear of the invention exhibits high dust-adsorption and trapping effects, even though having a high air-permeability and small weight per unit area. The electret non-woven fabric material used in the present invention preferably has a weight per unit area of 100 g/m.sup.2 or less, more preferably 80 g/m.sup.2 or less, most preferably several tens of g/cm.sup.2, and thus the headgear of t
REFERENCES:
patent: 4375718 (1988-03-01), Wadsworth et al.
patent: 4781966 (1988-11-01), Taylor
patent: 4909975 (1990-03-01), Sawyer et al.
patent: 5143767 (1992-09-01), Matsura et al.
Ando Katsutoshi
Togashi Ryoichi
Bell James J.
Toray Industries Inc.
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