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Paper Bags & Corrugated Cardboard Boxes: "Green Gold" ~ 1948 Union Bag & Paper Corporation
🕑 Added 2021-01-11 21:36:25 +0000 UTCmore at http://quickfound.net/
"World's Largest Integrated Kraft Container Plant"
Originally a public domain film from the Library of Congress Prelinger Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and one-pass brightness-contrast-color correction & mild video noise reduction applied.
The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and/or equalization (the resulting sound, though not perfect, is far less noisy than the original).
https://en.wikipedia.org/wiki/Kraft_paper
Wikipedia license: http://creativecommons.org/licenses/by-sa/3.0/
Kraft paper or kraft is paper or paperboard (cardboard) produced from chemical pulp produced in the kraft process.
Sack kraft paper, or just sack paper, is a porous kraft paper with high elasticity and high tear resistance, designed for packaging products with high demands for strength and durability.
Pulp produced by the kraft process is stronger than that made by other pulping processes; acidic sulfite processes degrade cellulose more, leading to weaker fibers, and mechanical pulping processes leave most of the lignin with the fibers, whereas kraft pulping removes most of the lignin present originally in the wood. Low lignin is important to the resulting strength of the paper, as the hydrophobic nature of lignin interferes with the formation of the hydrogen bonds between cellulose (and hemicellulose) in the fibers.
Kraft pulp is darker than other wood pulps, but it can be bleached to make very white pulp. Fully bleached kraft pulp is used to make high quality paper where strength, whiteness, and resistance to yellowing are important...
Wood pulp for sack paper is made from softwood by the kraft process. The long fibers provide the paper its strength and wet strength chemicals are added to even further improve the strength. Both white and brown grades are made. Sack paper is then produced on a paper machine from the wood pulp. The paper is microcrepped to give porosity and elasticity. Microcrepping is done by drying with loose draws allowing it to shrink. This causes the paper to elongate 4% in the machine direction and 10% in the cross direction without breaking. Machine direction elongation can be further improved by pressing between very elastic cylinders causing more microcrepping. The paper may be coated with polyethylene (PE) to ensure an effective barrier against moisture, grease and bacteria, although recyclability is hindered. Zein coatings are also water resistant but allow better recyclability.
A paper sack can be made of several layers of sack paper depending on the toughness needed.
Kraft paper is produced on paper machines with moderate machine speeds. The raw material is normally softwood pulp from the kraft process.
Maintaining a high effective sulfur ratio or sulfidity is important for the highest possible strength using the kraft process.
The kraft process can use a wider range of fiber sources than most other pulping processes. All types of wood, including very resinous types like southern pine, and non-wood species like bamboo and kenaf can be used in the kraft process...
https://en.wikipedia.org/wiki/Union_Camp_Corporation
Union Camp Corporation was an American pulp and paper company and a private owner of timberland in the United States. In 1999 it was acquired by International Paper...
Union Camp came about through the merger of the Union Bag and Paper Company and the Camp Manufacturing Company. Each of these family-owned companies had unique histories that led to the ultimate success of Union Camp until it was acquired by International paper...
The Union Bag and Paper Company's history dates back to 1881 where it began as the Union Paper Bag Machine Company in Bethlehem Pennsylvania under the Calder family. In the late 1920s, partially due to concerns about the labor union movement in the north, the company built a major mill (the largest in the world at the time and for many years) in Savannah, GA. This mill, and local politics, were the subject of Ralph Nader's book, The Water Lords. The company had a major impact on Savannah politics, but was highly respected in the area as having kept Savannah from many of the severe effects of the Great Depression...
