Pertex

Pertex

Pertex is a versatile, wind resistant, durable wicking fabric with more breathing ability than waterproof membranes. It is typically found in winter clothing and sleeping bags.

The breathability of Pertex comes from the fabrics use of capillary action using denier gradients. Pertex combines two yarns with different properties. The inner yarn has larger filaments and outer yarn has smaller filaments. Capillary action moves moisture from larger filaments to smaller filaments without passing through the air.

Imagine a bundle of very fine fibres next to an equal weight bundle of thicker fibres. The same weight of material can make more thin fibres than an equal amount of thick fibres, thus there are more thin fibres on the outer side (and a tighter weave) than there are thick fibres on the inside.The bundle of finer fibres has greater surface over which moisture can spread - so they will evaporate moisture more quickly. The moisture from the inside is directed to the thinner fibres from thicker fibres by, again, capillary action. The driving force behind all this is the temperature difference between your own body heat on the inside and the air temperature on the outside.

Pertex is windproof because of the tight weave of the outer surface. The breathing ability of the fabric is not based on air passing through the weave of the fabric, but by moisture absorbed in the inner yarn passed to the outer yarn (which passes from the outer yarn to the outside air). Adding a waterproof coating would trap the moisture in the yarn, instead of letting it pass through the yarn and evaporate into the air.

References


Wikimedia Foundation. 2010.

Игры ⚽ Поможем сделать НИР

Look at other dictionaries:

  • PERTEX — pertextum …   Abbreviations in Latin Inscriptions

  • Pertex™ — …   Useful english dictionary

  • Layered clothing — is a manner of dressing using multiple garments that are worn on top of each other. Some of the layers have different, largely non overlapping, functions. Using more or fewer layers, or replacing one layer but not others, allows for flexible… …   Wikipedia

  • Sleeping bag — For other uses, see Sleeping bag (disambiguation). A mummy bag A sleeping bag is a protective bag for a person to sleep in, essentially a blanket that can be closed with a zipper or similar means, and functions as a bed in situations where a bed… …   Wikipedia

  • Snugpak — is the tradename of manufacturer Snugpak Ltd. Products include quality sleeping bags, rucksacks, tents, and warm outdoor clothing. The family owned company is situated in the West Yorkshire village of Silsden, England. A number of their products… …   Wikipedia

  • Coolmax — is a trademark and a brand name for a series of moisture wicking technical fabrics developed in 1986 by DuPont Textiles and Interiors (now Invista). The fabrics employ specially engineered polyester fibres to improve breathability compared to… …   Wikipedia

  • Bivouac sack — A bivouac sack (also known as a bivy sack , bivi bag or just bivy ) is an extremely lightweight, waterproof alternative to traditional tent systems. It is used by climbers, mountaineers, hikers, ultralight backpackers, soldiers and minimalist… …   Wikipedia

  • Ultralight backpacking — is an advancedcitation|title=Lightweight Backpacking and Camping|author1=George Cole|author2=Ryan Jordan|author3=Alan Dixon|isbn=0974818828|date=2006] Please see the legal disclaimer in Jordan, Lightweight Backpacking and Camping , page v: not… …   Wikipedia

  • Outdoor Writers and Photographers Guild — The Outdoor Writers and Photographers Guild was established in 1980 as a forum for writers and photographers specialising in the outdoors, mainly in the UK. It has since gone from strength to strength, and today has over 150 members. It is run by …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”