Abstract:
A method for making a leadless chip carrier (LCC) for use in electronic packages having a core layer stripped of copper cladding, containing drilled clearance holes within, a layer of resin coated copper (RCC) placed on the upper surface of the core layer and a second layer of RCC placed on the lower surface of the core layer. The layers are laminated together with the RCC filling the clearance holes during lamination. A pattern is etched on the RCC and vias are drilled through the filled clearance holes and pre-plated with seed copper layers. The seed copper layers in the vias are then covered by a layer of copper plating to meet the requirements of the core buildup layer, and resin inhibiting conductive anodic filament (CAF) growth within the structure.
Abstract:
Disclosed is a PCB having multiple layers of heavy copper. A prepreg having a nonwoven glass web substrate is used alone or together with another prepreg having a glass fabric substrate so that the space between heavy copper, which is comparable to a thick film, can be filled efficiently without creating voids. The PCB includes a copper clad laminate having first copper patterned on one surface or both surfaces of a core substrate; at least one first prepreg laminated on one surface or both surfaces of the copper clad laminate, nonwoven glass web being used as the substrate of the first prepreg; at least one second prepreg laminated on one surface or both surfaces of the first prepreg, glass fabric being used as a substrate of the second prepreg; and second copper laminated on one surface or both surfaces of the second prepreg.
Abstract:
A cushioning material for a heat press having a non-woven fiber composed of a fiber web (4), wherein the fiber web (4) comprises a first fiber (4a) containing softening temperature as a main component and a second fiber (4b) containing a second component having a relatively high softening temperature as a main component, and wherein the non-woven fabric has been compressed at a temperature being the softening temperature of the first component or higher and being the softening temperature of the second component or lower.
Abstract:
A method of manufacturing a circuit board comprising: an inner layer board laminating step for laminating inner layer board material and one or more metal sheet(s) for inner layer; an inner layer circuit forming step for forming circuits of the metal sheet to make an inner layer circuit board; a multi-layer laminating step for laminating one or more metal sheet(s) for multi-layer, one or more multi-layer board material(s) and one or more inner layer circuit board(s); and a multi-layer circuit forming step for forming circuits of the metal sheet for the multi-layer, wherein the inner layer board material and the multi-layer board material are different in material composition from each other. According to the present invention, it is possible to stabilize the quality of interstitial connection of the inner layer circuit board and to improve the mechanical strength such as the adhesive strength of an outer layer circuit.
Abstract:
The present invention relates to a nonwoven substrate, and specifically to a nonwoven substrate imparted with a three-dimensional image, wherein the three-dimensional nonwoven substrate is particularly suited as a support substrate for a PCB (Printed Circuit Board) and similar application.By the utilization of a hydroentangled, three-dimensionally imaged support substrate impregnated with a durable resinous matrix, PCB's, and similar applications, can be imparted with unique and useful performance properties, to improve structural performance.
Abstract:
The present invention relates to aramid paper which is suitable for composite structures and which is made using a combination of para-aramid pulp, floc, and, optionally, a polymer binder material.
Abstract:
A circuit board including a desired number of electrically insulating layers and wiring layers laminated alternately, and an inner via hole for securing an electrical connection between the wiring layers by compressing and hardening a conductive paste including a conductive particle and a resin. In the electrically insulating layer, a porous sheet is provided a resin sheet at least one surface, and the porous sheet is not impregnated with a resin at least at a central portion. A through hole penetrating the electrically insulating layer in the direction of the thickness of the electrically insulating layer is filled with a conductive paste including a conductive particle and a resin, and pores that are present inside the porous sheet are filled with laminated resin. The average hole diameter of the pores inside the porous sheet may be smaller than the average particle size of the conductive particle. Thereby, it is possible to make the insulating layer of the circuit board securing the interlayer electrically connection by an inner via hole including a conductive paste to be homogenized and ultra-thin and improve the reliability of the connection of the inner via hole.
Abstract:
A nonwoven fabric is constructed of a highly flat glass fiber which is a glass fiber whose section is flat and has a flatness ratio of 2.0 to 10 and which has such a section that the packing fraction is at least 85%, preferably at least 90%. In this nonwoven fabric, the glass fiber section has a shape near rectangle, and hence, the glass fibers can be arranged very densely to form a thin nonwoven fabric having a high bulk density, and when it is used as a laminate material, the glass fiber content can be increased and the surface smoothness can simultaneously be enhanced and can be used appropriately as a reinforcing material for a printed wiring board. Moreover, the above flat glass fiber can be produced by use of, for example, a nozzle having such a shape that one side of the major axis walls of a nozzle chip having a flat nozzle hole is partly notched.
Abstract:
A nonwoven fabric is constructed of a highly flat glass fiber which is a glass fiber whose section is flat and has a flatness ratio of 2.0 to 10 and which has such a section that the packing fraction is at least 85%, preferably at least 90%. In this nonwoven fabric, the glass fiber section has a shape near rectangle, and hence, the glass fibers can be arranged very densely to form a thin nonwoven fabric having a high bulk density, and when it is used as a laminate material, the glass fiber content can be increased and the surface smoothness can simultaneously be enhanced and can be used appropriately as a reinforcing material for a printed wiring board. Moreover, the above flat glass fiber can be produced by use of, for example, a nozzle having such a shape that one side of the major axis walls of a nozzle chip having a flat nozzle hole is partly notched.
Abstract:
A solid sheet which contains an nonwoven fabric made from short high tensile modulus fibers and a thermoplastic polymer having a low moisture absorption matrix resin that is useful as a substrate for circuit boards.