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Cellulose fibers (/ ... Hemp 1.48 1.6 550–900 70 Ramie 1.5 2.0–3.8 ... Tensile strength: Similar, on average, to the polypropylene's fibers.
The kenaf fiber needs to be treated properly to remove the lignin. The tensile strength of the kenaf fiber is about 800 MPa, which makes it suitable natural fiber in engineering applications. [8] The core is about 60% of the plant and has fibre cells that are thick (≈38 μm) but short (0.5 mm) and thin-walled (3 μm). [9]
Also, these fibers are relatively long fibers, and present high cellulose content, which delivers a high tensile strength, and degree of cellulose crystallinity, whereas natural fibers have some disadvantages because they have hydroxyl groups (OH) in the fiber that can attract water molecules, and thus, the fiber might swell. This results in ...
Compared to wood pulp, hemp pulp offers a four to five times longer fiber, a significantly lower lignin fraction as well as a higher tear resistance and tensile strength. However, production costs are about four times higher than for paper from wood, [ 71 ] since the infrastructure for using hemp is underdeveloped.
This is a benefit in endurance applications and for cruising sails where durability is key. Additional advantages of Vectran fiber has a 0.02% creep at 30% of max load after 10 000 hours, high chemical and abrasion resistance and high tensile strength.
The mechanical strength values of Setralit-fibers reflect those of the primary material (e.g. flax, hemp, ramie fiber). The ultrasonic procedure does not lead to a damage of the fiber. Any losses in strength properties are due only to the mechanical wear during the second processing step.
Wrapping paper with hemp fiber excavated from the Han Tomb of Wu Di (140-87 BC) at Baqiao, Xi'An. The first identified coarse paper, made from hemp, dates to the early Western Han dynasty, 200 years before the nominal invention of papermaking by Cai Lun, who improved and standardized paper production using a range of inexpensive materials, including hemp ends, around 2000 years ago. [1]
Hemp concrete has a low thermal conductivity, ranging from 0.06 to 0.6 W m −1 K −1, [24] [15] [25] a total porosity of 68–80% [24] [26] and a density of 200 kg /m 3 to 960 kg/m 3. [ 15 ] [ 27 ] Hemp concrete is also an aerated material with high water vapour permeability and its total porosity very close to open porosity allowing it to ...