Abstract: Filter structure including filter layer having air permeability to filter gas passing therethrough and adhesive layer of adhesive on at least part of one surface of the filter layer. A size of the filter layer is appropriate for the dimension of a first object, in case of attachment to a second object having a dimension smaller than that of the first object, the filter layer configured to be cut at a predetermined position, in which the adhesive layer includes a strip contour adhesive layer continuous along a contour of the filter layer and a strip partition adhesive layer continuous along at least part of the contour adhesive layer, at a predetermined interval therefrom, within the contour adhesive layer, a cut region being set between the contour adhesive layer and the partition adhesive layer so that the filter layer is cut to a size appropriate for a size of the second object.

Abstract: A filter structure (F) includes a filter layer (1), an adhesive layer (10), and a sheet layer (20). The sheet layer has a thickness of 12 ?m to 75 ?m, and has a surface roughness Ra of 0.09 ?m to 0.4 ?m on a surface in contact with the adhesive layer. By setting the thickness of the sheet layer to 12 ?m or more, waving when the sheet layer is laminated on the adhesive layer is reduced, and surface smoothness of the adhesive layer is maintained. By setting the thickness of the sheet layer to 75 ?m or less, the sheet layer is less likely to be separated from the adhesive layer during folding. Since the surface roughness Ra of the sheet layer is 0.4 ?m or less, a surface roughness of the adhesive layer in contact with the sheet layer is controlled to a state of reliably exerting an adhesive force. Since the surface roughness of the sheet layer is 0.09 ?m or more, handleability is improved, and a manufacturing cost is not increased.

Abstract: Provided is a filter structure for filtering passing gas by being adhered to an object. The filter structure includes: a filter layer including a sheet-shaped member having air permeability; and an adhesive layer that is formed on at least a part of one surface of the filter layer and is configured to be adhered to the object. The adhesive layer is formed of an acrylic hot-melt adhesive, has a ratio K1/K2 of a maximum peeling load K1 at 25° C. to a maximum peeling load K2 at 5° C. in a range of 1 to 6, and the filter structure does not separate from the object when adhered to the object under a temperature condition of 25° C. or 5° C.

Abstract: A non-woven fabric body (11) that forms a non-woven fabric (1) is formed by integrating composite polyester fibers (2) and flame-retardant acrylic fibers (3) which serve as the other fibers of the rest. The composite polyester fibers (2) have a core-sheath structure in which a sheath portion (4) is formed of a low melting point polyester and a core portion (5) is formed of a high melting point polyester having a higher melting point than that of the low melting point polyester. The composite polyester fibers (2) are contained in an amount of 15% to 80% by weight in a total of 100% by weight of the non-woven fabric body (11). Further, an apparent density of the non-woven fabric body (11) ((a basis weight of the non-woven fabric body)/(a thickness of the non-woven fabric body)) is 0.005 g/cm3 to 0.040 g/cm3.

Abstract: A non-woven fabric body (11) that forms a non-woven fabric (1) is formed by integrating composite polyester fibers (2) and flame-retardant acrylic fibers (3) which serve as the other fibers of the rest. The composite polyester fibers (2) have a core-sheath structure in which a sheath portion (4) is formed of a low melting point polyester and a core portion (5) is formed of a high melting point polyester having a higher melting point than that of the low melting point polyester. The composite polyester fibers (2) are contained in an amount of 15% to 80% by weight in a total of 100% by weight of the non-woven fabric body (11). Further, an apparent density of the non-woven fabric body (11) ((a basis weight of the non-woven fabric body)/(a thickness of the non-woven fabric body)) is 0.005 g/cm3 to 0.040 g/cm3.