Apparatus for measuring the weight per unit area of a manufactured sheet product consisting of a reinforcing material surrounded by a bulk material

Claim 2

Apparatus for measuring the weight per unit area of various constituents of a tire fabric manufactured by calendering rubber onto both sides of a metal cord, comprising: a first radiation source and radiation detector for generating a first electrical signal proportional to the radiation received at said first radiation detector, said first source being such that the rubber in said fabric absorbs a first fraction of said radiation and the metal cord in said fabric absorbs a second fraction, said second fraction being greater than said first fraction of said radiation whereby the radiation received at said first detector is primarily a measure of the metal weight per unit area of said tire fabric; a second radiation source and detector for generating a second electrical signal proportional to the radiation received at said second detector, said second source being such that a first fraction of its radiation is absorbed by said rubber and a second fraction of its radiation is absorbed or blocked by said metal cord whereby the radiation received at said second detector is primarily a measure of the rubber weight per unit area; and means for combining said first and second signals to form a third electrical signal proportional to the total weight per unit area of said tire fabric.

Claim 3

The apparatus of claim 1 wherein said first radiation source is a beta source and said second radiation source is an x-ray source.

Claim 4

The apparatus of claim 1 wherein said first radiation source is Strontium 90 and said second radiation source is Americium 241.

Claim 5

The apparatus of claim 1 further including means for combining said first and second signals to form a fourth electrical signal proportional to the weight per unit area of said metal cord.

Claim 6

The apparatus of claim 4 further characterized by means of combining said third and fourth signals to form a fifth electrical signal proportional to the weight per unit area of gum in said tire fabric.

Claim 7

The apparatus of claim 1 wherein said first and second radiation source and detector units are in a backscatter configuration.

Claim 8

The apparatus of claim 1 wherein said first and second radiation source and detector units are in a transmission configuration.

Claim 9

The apparatus of claim 7 wherein said first radiation source and said second detector are located on the same side of said tire fabric.

Claim 10

Apparatus for measuring the weight per unit area of a manufactured sheet product consisting of a first material layer having a first scattering or absorption characteristic and a second material layer having a second scattering or absorption characteristic and wherein said first characteristic is different from said second characteristic, said apparatus comprising: a first radiation source and radiation detector for generating a first electrical signal proportional to the radiation received at said first radiation detector, said first source being such that said first material layer in said product absorbs or scatters a first fraction of said radiation and said second material layer in said product absorbs or scatters a second fraction, said second fraction being different than said first fraction of said radiation; a second radiation source and detector for generating a second electrical signal proportional to the radiation received at said second detector, said second source being sUch that a first fraction of its radiation is absorbed or scattered by said first material layer and a second fraction of its radiation is absorbed or scattered by said second material layer, said first and second fractions from said first source being different than the respective first and second fractions of said second source; and means for combining said first and second signals to form a third electrical signal proportional to the weight per unit area of a particular constituent of said product.

Claim 11

Apparatus for measuring the weight per unit area of a manufactured sheet product consisting of a first material layer having a first scattering or absorption characteristic and a second material layer having a second scattering or absorption characteristic and wherein said first characteristic is different from said second characteristic, said apparatus comprising: a first radiation source and radiation detector for generating a first electrical signal proportional to the radiation received at said first radiation detector, said first source being such that said first material layer in said product absorbs or scatters a first fraction of said radiation and said second material layer in said product absorbs or scatters a second fraction, said second fraction being different than said first fraction of said radiation; a second radiation source and detector for generating a second electrical signal proportional to the radiation received at said second detector, said second source being sUch that a first fraction of its radiation is absorbed or scattered by said first material layer and a second fraction of its radiation is absorbed or scattered by said second material layer, said first and second fractions from said first source being different than the respective first and second fractions of said second source; and means for combining said first and second signals to form a third electrical signal proportional to the weight per unit area of a particular constituent of said product.