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Tuesday 9 January 2018

Thermal comfort properties of bamboo tencel knitted fabrics

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Author(s):
Govindan Karthikeyan (Department of Textile Technology, K.S. Rangasamy College of Technology, Erode, India)
Govind Nalankilli (Sriram Engineering College, Perumalpattu, India.)
O L Shanmugasundaram (Department of Textile Technology, K.S. Rangasamy College of Technology, Erode, India.)
Chidambaram Prakash (Department of Fashion Technology, Sona College of Technology, Salem, India.)
Citation:
Govindan KarthikeyanGovind NalankilliO L ShanmugasundaramChidambaram Prakash, (2016) "Thermal comfort properties of bamboo tencel knitted fabrics", International Journal of Clothing Science and Technology, Vol. 28 Issue: 4, pp.420-428, https://doi.org/10.1108/IJCST-08-2015-0086
Downloads:
The fulltext of this document has been downloaded 172 times since 2016
Abstract:
– The purpose of this paper is to present the thermal comfort properties of single jersey knitted fabric structures made from bamboo, tencel and bamboo-tencel blended yarns.

– Bamboo, tencel fibre and blends of the two fibres were spun into yarns of identical linear density (30s Ne). Each of the blended yarns so produced was converted to single jersey knitted fabrics with loose, medium and tight structures.

– An increase in tencel fibre in the fabric had led to a reduction in fabric thickness and GSM. Air permeability and water-vapour permeability also increased with increase in tencel fibre content. The anticipated increase in air permeability and relative water vapour permeability with increase in stitch length was observed. The thermal conductivity of the fabrics was generally found to increase with increase in the proportion of bamboo.

– It is clear from the foregoing that, although a considerable amount of work has been done on bamboo blends and their properties, still there are many gaps existing in the literature, in particular, on thermal comfort, moisture management and spreading characteristics. Thus the manuscript addresses these issues and provides valuable information on the comfort characteristics of the blended fabrics for the first time. In the evolution of this manuscript, it became apparent that a considerable amount of work was needed to fill up the gaps existing in the literature and hence this work which deals with an investigation of the blend yarn properties and comfort properties of knitted fabrics was taken up.

– This research work is focused on the thermal comfort parameters of knitted fabrics made from 100 per cent tencel yarn, 100 per cent bamboo yarn and tencel/bamboo blended yarns of different blend ratios.
Keywords:
Thermal comfortComfortBamboo tencel blends
Publisher:
Emerald Group Publishing Limited
Copyright:
© Emerald Group Publishing Limited 2016
Published by Emerald Group Publishing Limited
For further details log on website :
http://www.emeraldinsight.com/doi/abs/10.1108/IJCST-08-2015-0086

Bamboo Vs. Tencel: Which Is the Better Material for Sheets?

Author
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When it comes to buying bedsheets, the options have expanded far beyond just cotton. While still a firm favorite and solid choice, there are new bed sheet materials attempting to challenge its crown. Two such options are bamboo and Tencel.
There are many similarities between the two bedsheet fabrics, from raw materials, to production processes, to their final properties. Making a decision between the two is trickier than ever! Here is a comprehensive guide comparing bamboo and Tencel in order to help aid your decision.

WHAT IS BAMBOO?

Bamboo is botanically categorized as a grass rather than a tree, although the fibers of the plant are more conventionally wood-like.
The plant is turned into fabric in two ways – mechanically or chemically. The mechanical method crushes the bamboo manually into a mush, then uses natural enzyme to further break it down. The fibers are then combed out and spun. Mechanically treated bamboo is sometimes called bamboo linen.
Chemical treatment of bamboo begins by “cooking” the bamboo in caustic soda or lye in a multi-step process. It’s quicker, but has more environmental impact thanks to the harsh chemicals used. Bamboo produced through chemical treatment is sometimes called bamboo rayon.

WHAT IS TENCEL?

Tencel is also created from wood pulp – typically from eucalyptus trees. What makes it unique as a material is its manufacture process.
Close up of the head of Malouf Woven Tencel Sheets
It’s made of regenerated fibers, which means it’s made by dissolving the cellulose fibers of a plant with chemicals, then making them into more easily woven fibers again. Tencel production uses environmentally friendly and non-toxic solvents, making its production particularly “green.”
Another environmental boon of Tencel is what it calls the “closed loop process.” This means that almost all of the solvents used in the production are recovered and don’t leak into the environment.

BENEFITS OF BAMBOO

One huge benefit of bamboo bedsheets is their environmental soundness. Bamboo is one of earth’s fully sustainable wood sources – it can grow up to a yard per day. When the bamboo is harvested the roots of the plant are not destroyed, so it can continue to grow. Plus, bamboo is one of the fasted growing woods in the world.
Close up of the Purple sheets, which use viscose from bamboo in their construction
Bamboo bed sheets also have many benefits in terms of comfort. They have an extremely soft and smooth feel, thanks to their makeup of longer fibers. They “wick” moisture away from the body, meaning you won’t feel sweaty or clammy. Bamboo sheets are very breathable, too. They don’t trap heat close to the body, which is great both from bed sharers and for those who live in warm, humid climates.
Bamboo bed sheets wash well at low temperature and don’t require fabric softener or any special washing care. They also dry very quickly, making the ideal for those in smaller apartments without a washer-dryer. When looked after properly bamboo sheets are very durable, and can last a long time.
There are also some health-related benefits to bamboo sheets. They’re both antifungal and antibacterial. They’re generally hypoallergenic and resistant to dust mites. Bamboo sheets are also much less prone to mold, mildew and odor than traditional cotton.

DRAWBACKS OF BAMBOO

Bamboo bed sheets can be somewhat pricey. The range is similar to that of top quality cotton. However, when looked after properly, like cotton, they can last a really long time.
Aesthetic-wise, bamboo bed sheets can be more prone to wrinkling, due to their softness and suppleness. They also lack the “crisp” bedsheet feeling, which is a matter of personal preference.

BENEFITS OF TENCEL

Tencel is one of the best environmental choices when it comes to bedsheets. Not only are the eucalyptus trees it’s made from a (generally) sustainable energy source, but the production process both avoids use of dangerous chemicals, and stops the solvent they use leaking into the environment.
Tencel bed sheets also have a very smooth and soft feel. This is because it using long fibers and thus has a smoother surface. This is not only comfortable, but may be really beneficial to those with sensitive or easily-irritated skin. These fibers are hydrophilic, which means they literally “love water,” so Tencel is very absorbent and hygienic.
There are also benefits to Tencel in terms of breathability. It’s ideal for warm sleepers, and actually has a cool feel to the touch. It takes dye well, and is less prone to wrinkling. Tencel tends to have a lustrous and less matte look.

DRAWBACKS OF TENCEL

Like bamboo, Tencel can be expensive, and the range of price within Tencel is not very broad.
Tencel also lacks the feeling of “crispness” some desire with their bedsheets. Instead it’s softer and more drapey.
Because of the hydrophilic nature of Tencel fibers, it can be slightly more susceptible to mildew. If cared for properly, though, this shouldn’t be a problem.

WHAT ARE THE MAIN DIFFERENCES BETWEEN BAMBOO AND TENCEL?

A major difference between the two is the solvent used in the dissolution process (which turns wood into pulp). In chemical bamboo production, the solvent is sodium hydroxide, which is classified as corrosive. Although this substance will not remain on the bed sheets, it can be harmful to the surrounding environment. Tencel uses a solvent called N-methylmorpholine N-oxide, or NMMO, which is generally not considered as harmful to the environment. Tencel also recycles 99% of the water used in its production, but no such figure exists for bamboo.
Close up shot of the Nest Bedding bamboo sheets
Overall, it seems Tencel has the environmental upper hand on bamboo – although bamboo is significantly more sustainable and less polluting than materials like cotton.
The feel of Tencel and bamboo bedsheets are generally similar – soft, smooth and strong. Neither have the crisp feel of cotton. Here bamboo may have a slight upper hand, though, due to the small potential for mildew in Tencel.

SOME SLEEPOPOLIS FAVORITES

In terms of Tencel, one of our favorite sets of sheets is the Malouf Woven Tencel Sheets. They’re good quality (scoring an A+ on our testing scale), with the softness, smoothness and cool feel you’d expect from Tencel. Plus, they come with an affordable price tag (around $90 for a Queen).
For bamboo, two great options come from Purple and Nest Bedding. The former are a spandex and bamboo blend, which makes them easy to take care of and less prone to wrinkling, while the latter are made of high-quality 100% bamboo fiber.
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ANNIE WALTON DOYLE

Annie Walton Doyle is a freelance writer based in Manchester, UK. Her work has appeared in The Huffington Post, The Daily Telegraph, Professional Photography Magazine, Bustle, Ravishly and more. When not writing, she enjoys pubs, knitting, nature and mysteries.
For further information log on website :
https://sleepopolis.com/blog/bamboo-vs-tencel-sheets/

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