The ease or otherwise of the passage of air is of importance for a number of fabrics end uses such as industrial filters, tents, sailcloth’s, parachutes, bulletproof, windproof, raincoat materials, shirting’s, down proof fabrics and airbags.In this article, Knitting Expo will introduce you the importance of Air Permeability.
Fabric air permeability is a measure to what extent it gives air passing through the fabric. Air permeability, a given area in the vertical direction of the air flow rate, a given time period, as measured by the fabric test area inside the pressure difference of the fabric. Basically, it depends on weight, thickness and porosity of fabric. The porosity of fabric is the demonstration of the air gap as a percentage within the fabric. It has been important for especially the tent fabric and parachute.
The reciprocal of air permeability, air resistance, can be defined as the time in seconds for ImI of air to pass through 100s mm2 of fabric under a pressure head of 10mm of water. The advantage of using air resistance instead of air permeability to characterize a fabric is that in an assembly of a number of fabrics, the total air resistance is then the sum of the individual air resistance.
Fabrics, are porous materials which allow the transmission of energy and substances and are therefore interesting materials for different applications. In general, they are used for clothing, interior and wide range of technical applications
Garments must be characterized by good air circulation between the skin surface and the environment, good ventilation at skin level and the possibility of eliminating the excess humidity generated through perspiration.
Air permeability, simply a physical ability of a fabric to let certain air flow through under differential pressure between either surface, refers to the speed at which water vapour molecules transmit into the top layer. Fabrics with different surface textures on either side can have a different air permeability depending upon the direction of air flow. Air permeability and fabric porous structure are correlated and indicate the breathability which makes great differences in the performance of materials. That is to say, air permeability and porous fabric structure affect how breathable a garment is; besides, air permeability can be measured, whereas breathability is more subjective.
#??#
In the British Standard test, the airflow through a given area of fabric is measured at a constant pressure drop across the fabric of 10mm head of water. The specimen is clamped over the air inlet of the apparatus with the use of rubber gaskets and the air is sucked through it by means of a pump as shown in Fig.A. The air valve is adjusted to give a pressure drop across the fabric of 10mm head of water and the air flow is then measured using a flow meter.
Five specimens are used each with a test area of 508mm2 (25.4mm diameter) and the mean air flow in ml per second is calculated from the five results. From this, the air permeability can be calculated in ml per 100mm2 per second.
Classification of fabrics: based on fabric type there are four types of fabrics
Woven fabric: this has been defined as the interlacing/ interlacement of warp and weft yarns where minimum two sets of yarns are needed and warp yarn stay in vertical and parallel to the selvedges.
Knitted fabrics: This has been defined as the interloping/interlocking/ intermeshing of warp yarn where minimum one set of yarn is needed.
Non-Woven fabrics: this has been defined as the mechanical/chemical/thermal bonding to make non-woven fabrics.
Braided fabrics: this is defined as the intertwining/diagonal/interlacement to make braided fabric where minimum three sets of yarns are needed.
Correlation between porosity and air permeability of fabric is very complicated because changes of the textile structure (by the influence of the venting system), can be possibly classified as a horizontal increase in porosity. A correlation relationship has been elaborated between the percentage of open porosity for double layer fabrics and air permeability, considering the use of the different system of reed denting.
Fabric porosity is an important parameter in the assessment of clothing comfort and physical properties of technical textiles and the porosity are defined by the ratio of free space to fibre in a given volume of fabric. The porous are by voids between weft and warp yarns in the fabrics. The air passes through the pores from the surface of the fabric. Tightness factor can be used for fabric air permeability forecasting. The high correlation between the permeability to air and the tightness factor confirms that. Porosity is affected by yarn number or yarn count number. … Increasing loop length, looser the structure and so the values of air permeability increases.
Source: textile school
#??#
Conservative and reassuring textile designs, tactile wools, precious feminine silk and viscose and performance-driven denim options stole the spotlight at the Knitting Expo 's digital-only event.
The general consensus among people is that 2021 opened on an uncertain note, despite a few exceptions including the Iluna Group, a specialist in the production of stretch lace for the apparel and innerwear industries, which forecast this year will see a rebound and revenues will get back to pre-pandemic levels.
In order to dodge the worst, fabric-makers pressed on with digital transformation and sustainability.
The APAC region, particularly China, is the bright spot for Eastman’s Naia, a division of the Kingsport, Tenn.-based materials manufacturing company, which produces the bio-based Naia cellulosic filament yarn.
Eastman’s global marketing director Ruth Farrell said “the current context is a challenge, but it also creates an opportunity to reinvent common approaches, boost our creativity and accelerate the focus on sustainable fashion,” bringing to light another key trend seen at Première Vision as well as in the overall textile market.
As end customers have generally cut back on their fashion expenses, textile designs tended to skew toward a conservative and reassuring approach. Mills offered tactile, cozy and fluid wools, offered in lighter weights to hug the body for more relaxed and loungewear-inspired suiting, while feminine silk and viscose blends were enriched by precious finishings such as metallic glints, and lace came in shimmering iterations.
#??#
An organic and rustic feel took center stage, with linen and hemp appearing in several collections. Men’s suits and shirts crafted from linen were yarn-dyed, while windowpane checks and stripes exuded a countryside vibe. Denim suppliers took a bolder route, reassured by the good performance of the category, with embroideries, jacquards and washed-out nuances stealing the spotlight.
TRACEABLE COTTON: A premium provider of eco-friendly solutions, Albini Group offered its Biofusion line of organic cotton that is fully traceable thanks to a close relationship with the U.S. farms providing the raw material. In particular, the firm has forged ties with farmers in Texas, New Mexico and California for the plantation of Supima extra-long staple cotton and Upland, a long fiber and high-quality cotton traceable, according to forensic company Oritain. Suitable for a total look, at a time when formal shirting is losing steam, the traceable cotton can be used for suits and pants, as well as shirts offered in pastel-toned and earthy-hued stripes and checks, a trend also seen at Milano Unica.
SUSTAINABLE KNITWEAR: Eastman Naia brought to Première Vision Paris its innovation introduced late last year Naia Renew, a blend of 60 percent cellulosic fiber derived from sustainably sourced wood pulp and 40 percent recycled plastic waste. It also expanded its signature Naia fiber to the knitwear category boasting a silky and soft hand and breathability.
BOLD INDIGO: Indigo specialist PG Denim went bold and daring with flock options dyed with natural indigo and color versions crafted from an Organic Content Standard-certified cotton treated with metal-free, natural dyes. By partnering with Eurotessile, PG Denim introduced a recycled denim made of ring-spun yarns, while in tune with the times and the surge in demand for antiviral fabrics, the mill struck a deal with Polygiene for a range of antibacterial and odor-control indigo fabrics.
PERFORMANCE DENIM: Among the key innovations Berto introduced for spring 2022, a performance-driven denim option combined the Aquafil’s man-made Dryarn weft thread with cotton. The former improves the fabric’s performances providing lightness, breathability and fast drying, in tune with customer demand for easy-care options. The overall collection blended cotton with synthetic fibers for an extra dose of comfort, nodding to sportswear and technical materials.
#??#
FLAMBOYANT LACE: Iluna Group introduced the first flock lace that is Global Recycled Standard-certified. Crafted from a blend of Fulgar’s Q-Nova polyamide that comes from pre-consumer recycled fibers and of Roica’s recycled premium stretch yarns, it is offered in a variety of options that brands and retailers can customize, including graphic motif and wild-animal patterns rendered in vibrant and pop-tinged hues. As part of its Bioline range, the company upped the ante on the circular economy, offering a stretch lace that biodegrades in five years without releasing harmful compounds.
Source: WWD
#??#
Take your yoga practice to another level with a new pair of extra comfy yoga pants. There’s a range of styles available for men, from performance-enhancing compression tights to super-soft joggers that you’ll never want to take off. Look for technical fabrics that wick away your sweat, keeping you feeling fresh and cool the whole way through your workout. The best part about many yoga pants styles for men is that you can wear them straight from the mat through the rest of your day running errands or lounging around the house.
1. Nike Dri-FIT Men’s Yoga Trousers
Nike’s Dri-FIT Men’s Yoga Trousers let you move through your workout with ease and comfort. The fit features tapered legs, a roomy gusset, and an elastic waistband, which gives you plenty of space for unrestricted movement without the distraction of excess fabric. These yoga pants also make use of Nike’s Dri-FIT technology. This innovative and high-performance microfiber construction wicks away sweat, directing it to the surface for quick evaporation. It keeps you cool and dry. Finally, enjoy the convenience of two slash pockets, plus an internal media pocket to store your phone.
2. Nike Yoga Trousers
If you’re looking for yoga pants made from more sustainable materials, then Nike’s Yoga Trousers are a great option. Each product contains at least 75% recycled polyester fibers from used plastic bottles. They also feature Dri-FIT technology for its moisture-wicking and cooling features. Additional cooling comes from mesh panels at the back of the knees and calves for increased air-flow throughout your session. The fabric is lightweight and stretchy, so it doesn’t inhibit any movement or stretches. Lastly, you’ll enjoy the benefit of pockets to hold your phone or other essentials.
3. Alo Yoga Stability 2 in 1
Enjoy comfort and coverage with this pant and short combo from Alo Yoga. It features four-way stretch fabric for the ultimate movement and ribbed paneling for fit and comfort. The moisture-wicking technology will keep you feeling cool and fresh, no matter how rigorous your workout gets. Practical elements include an elastic and drawcord waist, so you can adjust as you need. There are also invisible zip pockets to keep your essentials safe. Lastly, you can choose from a range of colors. Opt for classic black, crisp white, black and grey, navy and grey, or blue and white.
#??#
4. Willit Men’s Cotton Yoga Sweatpants
The skin-friendly cotton blend in the Willit Men’s Cotton Yoga Sweatpants wicks away moisture to keep you dry on the mat. It also uses Flatrock stitching, which reduces chafing and sits smoothly against your skin. The wide legs and four-way stretch maximizes the range of movement and ensures high levels of comfort. These pants are ideal for yoga and other exercises, as well as just lounging around the house on lazy days. You’ll also appreciate the convenience of deep side pockets, giving you the ability to keep your essentials close by.
5. BALEAF Men’s Cotton Yoga Sweatpants
Keep it loose and casual with these yoga sweatpants from BALEAF. While they’re designed for yoga workouts, they’re also perfect for recovery after intense cardio or weight sessions. The cotton-blend jersey fabric is exceptionally soft and low-friction. Meanwhile, the wide legs provide ease of movement for different stretches and poses. Keep your phone or wallet close by in the deep side pockets, and never worry about the weight of your belongings pulling down too much, thanks to the drawcord waistband. Lastly, select from a range of colors, including black, grey, charcoal, and navy.
6. TSLA Men’s Compression Pants
Compression tights are an excellent option for yoga, as they can help promote blood flow and muscle recovery. They’re ideal for releasing heat, wicking moisture, and controlling your body temperature. The firm fit is also suitable for avoiding uncomfortable chafing. Four-way stretch in the fabric lets you move and extend your body how you want, without your clothing getting in the way. If you’re self-conscious about working out in just the tights, they also make a great base layer for wearing shorts over the top.
7. DRSKIN Men’s Compression Pants
Move naturally and with ease in a pair of compression pants from DRSKIN. The lightweight, non-abrasive fabric is made with polyester and spandex for the ultimate stretch and durability. It wicks sweat away from your skin to the surface, drying quickly. There’s also two-way air circulation to keep you cool in summer but warm in winter. Plus, these pants provide UV protection if you’re working out outside. You’ll also enjoy the benefits of improved blood circulation, muscle recovery, and reduced fatigue thanks to the firm but comfortable compression fit. Finally, there’s a range of colors to choose from, and you can get multi-packs if you really love them.
#??#
8. AvaCostume Men’s Lightweight Loose Yoga Pants
Enjoy the soft, comfortable fit of these loose yoga pants from AvaCostume. While they are designed for your yoga sessions, they’re so comfy you’ll want to do nothing but lounge about in them! The blend of 95% cotton and 5% spandex gives an outstanding balance of natural breathability and flexible stretch. A soft elastic waistband ensures a good fit around your midsection. Choose options with or without pockets, depending on your needs. There’s also a large range of shades to pick from, making it perfect if you want to inject some color into your yoga wardrobe.
For more industry information, please pay attention to Knitting Fair.
Source: THETRENDSPOTTER
#??#