sulfate paper

sulfate paper

[′səl‚fāt ‚pā·pər]
(materials)
Paper made by the sulfate process, and which cannot be bleached as white as soda or sulfite paper; strong papers, such as kraft paper, are made from unbleached sulfate materials.
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Just recently, it was found out that the tech giant event filed for a patent for its rectangular shopping bags that are made from bleached sulfate paper. The (http://www.chicagotribune.com/bluesky/technology/ct-apple-files-patent-for-new-bag-20160922-story.html) Chicago Tribune has learned that the patent points out things that make Apple's shopping bags for its retail stores far superior than others. 
The paper bag may include a bag container formed of white solid bleached sulfate paper with at least 60% post-consumer content." The patent also describes the background of paper bags saying, "Bags are often used for containing items.