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US 3,943,269 AGranted
Paper felt and process for making the same
OwnerDavid B. Bellinventor
Life of this patent
Estimating the term…
Abstract
The process for producing roofing felt which is softer, more flexible and more fire-resistant than such felt commonly produced by the prior art and which consists of permeating the felt stock with a treating fluid comprising a mixture of oil and soda ladened water, next drying the treated felt stock to remove excess moisture therefrom, next impregnating the felt with heated molten asphalt, next permitting excess molten asphalt to drain therefrom and finally permitting the asphalt in the felt to cool.
Claims8
The process for producing flexible non-brittle roofing felt comprising:
- first, moisture conditioning a sheet of felted vegetable fiber to render the fibers soft, flexible, non-brittle and substantially free of free water and excess moisture;
- second, depositing an emulsion comprising from 10 to 100 parts water to each part of an oil with emulsifier and coupling agents added, onto said sheet and permitting the emulsion to penetrate and saturate the fibers of the sheet, said oil having a higher temperature of evaporization than water;
- third, extracting free emulsion from the sheet;
- fourth, subjecting the sheet to a temperature between the temperatures of vaporization of the oil and water and evaporatively removing a sufficient portion of the moisture therefrom to render fiber surfaces of the sheet structure substantially anhydrous in nature and having sufficient oil and water within the fibers of the sheet structure to render the felt structure soft and flexible;
- fifth, bathing the emulsion treated sheet in hot molten bath of asphalt and permitting the asphalt to penetrate the sheet structure;
- sixth, extracting the sheet from the bath and permitting excess hot molten asphalt to drain therefrom;
- finally, permitting the sheet to cool and the asphalt to solidify.
4 more elements
Dependencies are inferred from the claim text.