Abstract:
A nonwoven fabric includes a nanofiber. The nanofiber includes a core portion and a sheath portion covering at least a part of a surface of the core portion. The core portion includes a first polymer. The sheath portion includes a second polymer. The second polymer is smaller in polarity than the first polymer.
Abstract:
A mounting structure includes a bonding material (106) that bonds second electrodes (104) of a circuit board (105) and bumps (103) of a semiconductor package (101), the bonding material (106) being surrounded by a first reinforcing resin (107). Moreover, a portion between the outer periphery of the semiconductor package (101) and the circuit board (105) is covered with a second reinforcing resin (108). Even if the bonding material (106) is a solder material having a lower melting point than a conventional bonding material, high drop resistance is obtained.
Abstract:
A laminated nonwoven fabric includes a first nonwoven fabric that comprises first fibers, and a second nonwoven fabric that comprises second fibers. The second nonwoven fabric is laminated on the first nonwoven fabric. An average fiber diameter D1 of the first fibers and an average fiber diameter D2 of the second fibers satisfy a relation of D1>D2. In viewed from a side of a principal surface of the second nonwoven fabric being not opposed to the first nonwoven fabric, a total area of first portions of the second fibers superimposed on the first fibers and existing on the nearer side than the first fibers is larger than a total area of second portions of the second fibers existing and superimposed on voids S of the first nonwoven fabric formed of the first fibers.
Abstract:
A film material includes a substrate and a film layer arranged on one main surface of the substrate. The film layer contains a fibrous first resin and a thermosetting second resin in an uncured or semi-cured state, and a linear expansion coefficient CF of the first resin is smaller than a linear expansion coefficient CR of the second resin in cured state.
Abstract:
A laminate includes a first sheet containing first fibers, a second sheet laminated on the first sheet and containing second fibers, and an adhesive disposed between the first sheet and the second sheet. At least a part of the adhesive is disposed in an end portion along the edge side of the laminate so as to form a linear first region, and the first sheet is adhered to the second sheet via the first region. Alternatively, a mass per unit area of the adhesive present in an end portion along an edge side of the laminate is larger than a mass per unit area of the adhesive present in a portion near a central part of the laminate rather than the end portion.
Abstract:
A laminated nonwoven fabric includes first to third nonwoven fabrics and an adhesive sandwiched between at least the second nonwoven fabric and the third nonwoven fabric. The second nonwoven fabric contains second fibers and is laminated on the first nonwoven fabric containing first fibers, and the third nonwoven fabric contains third fibers and is laminated on the second nonwoven fabric on an opposite side to the first nonwoven fabric. An average fiber diameter of the first fibers is larger than that of the second fibers. The second nonwoven fabric has first and second regions which exist mixedly with each other, and a density of the second fibers in the second region is lower than that in the first region. A part of the adhesive is present between a portion of the first nonwoven and a portion of the third nonwoven fabric which face the second region.
Abstract:
A laminated nonwoven fabric includes a first nonwoven fabric containing first fibers, a second nonwoven fabric laminated on the first nonwoven fabric and containing second fibers, a third nonwoven fabric laminated on the second nonwoven fabric on an opposite side to the first nonwoven fabric and containing third fibers, and an adhesive containing a plurality of particles. Some of the plurality of particles of the adhesive is attached to the second nonwoven fabric. At least one of the first nonwoven fabric and the third nonwoven fabric is adhered to the second nonwoven fabric via the some of the plurality of particles of the adhesive. An average fiber diameter of the first fibers is larger than the average fiber diameter of the second fibers, and an average particle diameter of the plurality of particles of the adhesive is smaller than the average fiber diameter of the first fibers.