High opacity wrapping paper
OwnerVladimir Hampl Jr.inventor
Life of this patent
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Abstract
The present invention is generally directed to high opacity cigarette wrapping papers. The wrapping paper made according to the present invention contains a mixture of a white pigment and a black pigment. The white pigment, which can be, for instance, calcium carbonate, has a median particle size of from about 0.1 microns to about 0.5 microns, and particularly from about 0.2 microns to about 0.4 microns. It has been discovered that this particular particle size range, which is equal to one-half the wavelength of visible light, greatly increases the opacity, brightness and whiteness of the paper. Small amounts of a black pigment, such as carbon, are then added to further increase the opacity without significantly decreasing the whiteness or brightness of the paper relative to conventional cigarette paper.
Claims27
A wrapping paper for a smoking article comprising:
- a paper substrate containing a first filler and a second filler, said first filler comprising a white pigment having a median particle size of from about 0.1 microns to about 0.5 microns, said second filler comprising a black pigment being present within said paper substrate in an amount up to about 2% by weight, said wrapping paper having an opacity of at least 80% and a brightness of at least 70%.
A wrapping paper for a smoking article comprising:
- a paper substrate containing a first filler and a second filler, said first filler comprising calcium carbonate having a median particle size of from about 0.1 microns to about 0.5 microns, said calcium carbonate being present within said paper substrate in an amount from about 20% to about 40% by weight, said second filler comprising a black pigment being present within said paper substrate in an amount up to about 2% by weight.
A method for increasing the opacity of a wrapping paper for a smoking article comprising the steps of:
- incorporating into a paper substrate a first filler comprising a white pigment, said white pigment having a median particle size of from about 0.1 microns to about 0.5 microns, said white pigment being added to said paper substrate in an amount from about 20% to about 40% by weight;
- incorporating into said paper substrate a second filler comprising a black pigment, said black pigment being added to said paper substrate in an amount up to about 2% by weight;
- and
- wherein said white pigment and said black pigment are added to said wrapping paper in an amount sufficient to increase the opacity of said wrapping paper up to at least about 80%.
A smoking article comprising:
- a column of a smokable filler;
- and
- a wrapping paper surrounding said column of said smokable filler, said wrapping paper comprising a paper substrate containing calcium carbonate having a median particle size of from about 0.2 microns to about 0.4 microns, said paper substrate also containing a black pigment, said wrapping paper having a basis weight of from about 22 gsm to about 36 gsm, a permeability of from about 15 Coresta units to about 55 Coresta units, a total filler content of from about 25% to about 36% by weight, and an opacity of at least about 80%.
Dependencies are inferred from the claim text.