The role of envelope of high opacity.

摘要

b role of envelope of high opacity d this invention relates generally the roles of envelope of high opacity to cigarettes.The role of wrapper made in accordance with the present invention contains a mixture of a white pigment and a black pigment.The white pigment, which can be, for example, calcium carbonate, has an average particle size from about 0.1 micron to about 0.5 micron.And particularly from approximately 0.2 micron to about 0.4 micron.It was found that the range of specific particle size which is equal to half the wavelength of the visible light, greatly increase the transparency, clarity and whiteness of the paper.Small amounts of a black pigment, such as coal,They are then added to additionally increase the opacity without significantly decrease the brightness or clarity of role in relation to the role of conventional cigarettes.