Cut Protective Textiles by Daniel (Xuedong) Li

Author:Daniel (Xuedong) Li [Li, Daniel (Xuedong)]
Language: eng
Format: epub
ISBN: 9780128203910
Publisher: Elsevier Science
Published: 2020-11-15T00:00:00+00:00

Figure 5.27 Strength retention of different fibers after outdoor exposure. Source: From Dingenen JLJ. Gel-spun high-performance polyethylene fibres. In: Hearle JWS, ed. High Performance Fibres. Cambridge, England: Woodhead Publishing; 2001:77 [Chapter 3].

Figure 5.28 Acid and alkaline resistance of HPPE and para-aramid fibers. HPPE, High-performance polyethylene. Source: From Dingenen JLJ. Gel-spun high-performance polyethylene fibres. In: Hearle JWS, ed. High Performance Fibres. Cambridge: Woodhead Publishing; 2001:77 [Chapter 3].

In cut protective textiles, especially in gloves, usually HPPE is used in filament yarn formation. Due to HPPE’s low friction and therefore slippery characteristic, gloves made of HPPE fiber usually need palm coating (or called dipping) to enhance grip. Palm coating is more suitable for 13-gauge or lighter gloves than the heavier 7 or 10-gauge gloves. 7- and 10-gauge gloves are thick and relatively loose. The coating material can penetrate heavily into the gloves and thus makes the gloves heavy and rigid. This is the reason that coating is usually applied to 13-gauge or lighter gloves. For these high-gauge gloves, light denier yarns are more appropriate. 600 D yarn is suitable for 13-gauge, 400 D for 15-gauge, and 200 D for 18-gauge. If glass fiber is added, then 400 D HPPE can be used for 13-gauge. Some practical examples are demonstrated as follows

Example 5.2.2-1

A 600 D filament HPPE knit to a 13-gauge fabric together with 70 D spandex wrapped with two ends of 70 DTY in which spandex is stretched to a stretch ratio of 2.4–2.5. Total denier of this yarn is about 770 D, and the fabric (or glove) has a basis weight of ~400 gsm. If gloves are knit, the weight is 43–48 g per pair. A 600 D HPPE yarn can be cofed with the wrapped spandex, or HPPE can be used to further wrap the wrapped spandex then a single end of yarn is used for knitting.

Example 5.2.2-2

A 100 D glass fiber is wrapped with two ends of 70 DTY in two layers, respectively (one end DTY for each layer), and a 70 D spandex is also wrapped with two ends of 70 DTY with a stretch ratio of 2.4–2.5 for spandex. Then one end of 400 D HPPE yarn and the wrapped glass fiber are used to further wrap the wrapped spandex in sequence to form a single end yarn of ~810 D. This yarn is knit into a 13-gauge fabric with a basis weight of 380–450 gsm. If gloves are knit, the weight per pair is 45–50 g.

Example 5.2.2-3

One end 70 D spandex is wrapped with two ends of 70 D DTY in two layers (one end DTY per layer) with a stretch ratio of 2.4–2.5 for spandex, then one end of 400 D HPPE is used to further wrap this wrapped spandex to get a ~580 D yarn. This yarn is used to knit a 15-gauge fabric or glove. The basis weight of the resultant fabric is 350–400 gsm. If gloves are knit, the weight per pair is 40–45 g.

Example 5.2.2-4

One end 200 D HPPE yarn is cofed together with one end 70 D DTY to knit 18-gauge fabric or glove.

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