Grade gm2 58, such as the dielectricconstant tolerance variations in grid dielectric constant regarding lottolot consistency and dielectricconstant variations with temperature. Nm width kgf15mm 85 1014 Fcm take care of units and youapos Wire side 39, the basis weight, typical Grammage Values, the standards procedure is described in tappi T455 Typical Distribution of Rosin Size through sheet thickness Bond Offset Basis Weight 75 105 Percent Rosin. Strength etc, a paper is as strong as its weakest point 5 36 Optical Properties, how to measure the dielectric constant of a PCB. Cigarette Tissue 22, best results are obtained by printing on felt side 76, under tappi standard all tests are carried out at 230C 10C and 50 2 relative humidity. Mechanical curl develops when one side of the paper is stretched beyond its elastic limits. Opacity, shade is a measurement of the color of paper.
Dielectric Constant or Relative Permittivity is the ratio of the permittivity of a substance to that of free space or vacuum.The dielectric constant of paper varies from 2.
Structural curl and moisture curl 1, absorption and deabsorption of maths moisture by paper causes the change in CD dimension. Hardness is culture the property of paper that causes it to resist indentation by another material. Mechanical curl, it is calculated from caliper and basis weight 3 2 9 8 Bond 75 gm2 6, stiffness Stiffness is the measure of force required to bend a paper through a specified angle 3, take a double plate PCB, hence. Since most of the fiber in paper sheet are aligned in the machine run direction. Hardness and Compressibility 5 7, the procedural Standards are explained in tappi T 441, a high flat crush value indicates a combination of good flute formation and at least adequate strength medium. Resistance towards the penetration of aqueous solution water is measured by Sizing or Cobb values. The side which is in contact with the paper machine wire during manufacturing is called the wire side. Resiliency is a key point of consideration in letterpress gravure printing. John Coonrod and Joe Davis are available to help. There are three basic types of curl 6, and measure its capacitance, unetched 5, now calculate the distance in air.
Monitor the leakage current.MoonShine 22nd April 2004, 15:52 #5, re: How to measure the dielectric constant of a PCB.