Polyurethane laminate

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PUL diaper covers

Polyurethane laminate (PUL, thermal stretch, [1] fuzzy rubber [1] ) is a compound fabric made by laminating a cloth fabric to one or both sides of a thin film of polyurethane. [1] [2] Polyurethane laminated fabrics have a wide range of applications in medical, automotive and garment uses. [2]

Contents

Most PUL fabric is made by laminating lightweight polyester interlock knit fabric to a 1mm thick film of polyurethane. There are two processes used for lamination: solvent lamination, which fuses the fabric and polyurethane film into a single monolithic fabric, and hot melt, which uses heat-activated glue to adhere the fabrics together.[ citation needed ] Woven fabric and fleece fabric can also be used, [1] but a stiff fabric will drastically reduce the elasticity of the finished laminate.

Use

PU laminate cloth is waterproof, breathes and stretches somewhat, and is soft and flexible. It can usually be machine-washed and dried, [1] and cleaned with dilute bleach or alcohol. [2]

PU fabric is useful as a wind and/or water barrier in the construction of fluid-splash protecting garments, shower curtains, and outerwear clothing.[ citation needed ] It is used for upholstery, especially in cars and restaurants. [2]

It is used in watersports clothing and equipment. [1] PUL is used for tents and waterproofing backpacks. [3]

Because it can be readily cleaned and sterilized, PUL is used for medical bedding, mattress protectors, reusable incontinence products, diapers/nappies, wet bags, and cloth menstrual pads. [4] [5]

Materials and degradability

There are many different polyurethane blends and resin types, [6] which vary in durability, resistance to heat, ambient humidity, and light, [2] and the maximum temperature they will stand (some, for medical use, are autoclavable). [1] Resistance is measured by accelerated aging in a harsh controlled environment; the number of weeks survived is expressed as a hydrolysis resistance in units of years (expected under normal conditions). [7] Apart from heat and humidity, bleach, salt, and chlorine can also shorten coating life. [3]

If PUL is kept wet for a long time, it disintegrates into the water and sticks to itself, though it will probably go mouldy first. [7] If the polyurethane starts delaminating from the fabric, it may be possible to relaminate it with care and a hot iron. If the PU coating has decayed, it can be replaced. [8] [3]

See also

Related Research Articles

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Gore-Tex is W. L. Gore & Associates's trade name for waterproof, breathable fabric membrane. It was invented in 1969. Gore-Tex blocks liquid water while allowing water vapor to pass through and is designed to be a lightweight, waterproof fabric for all-weather use. It is composed of expanded PTFE (ePTFE). A stretched out form of the PFAS compound polytetrafluoroethylene (PTFE). Gore-Tex products free of "PFC of environmental concerns" repellent coating lacks the ability to repel oil that "Gore DWR" provided.

<span class="mw-page-title-main">Lamination</span> Technique of fusing layers of material

Lamination is the technique/process of manufacturing a material in multiple layers, so that the composite material achieves improved strength, stability, sound insulation, appearance, or other properties from the use of the differing materials, such as plastic. A laminate is a permanently assembled object created using heat, pressure, welding, or adhesives. Various coating machines, machine presses and calendering equipment are used.

Oilskin is a waterproof cloth used for making garments typically worn by sailors and by others in wet areas. The modern oilskin garment was developed by a New Zealander, Edward Le Roy, in 1898. Le Roy used worn-out sailcloth painted with a mixture of linseed oil and wax to produce a waterproof garment suitable to be worn on deck in foul-weather conditions. Oilskins are part of the range of protective clothing also known as foul-weather gear.

<span class="mw-page-title-main">Artificial leather</span> Material that imitates leather

Artificial leather, also called synthetic leather, is a material intended to substitute for leather in upholstery, clothing, footwear, and other uses where a leather-like finish is desired but the actual material is cost prohibitive or unsuitable, or for ethical concerns. Artificial leather is known under many names, including leatherette, imitation leather, faux leather, vegan leather, PU leather (polyurethane), and pleather.

<span class="mw-page-title-main">Waterproofing</span> Process of making an object or structure waterproof or water-resistant

Waterproofing is the process of making an object or structure waterproof or water-resistant so that it remains relatively unaffected by water or resisting the ingress of water under specified conditions. Such items may be used in wet environments or underwater to specified depths.

<span class="mw-page-title-main">Waterproof fabric</span> Textile that resists moisture penetration

Waterproof fabrics are fabrics that are, inherently, or have been treated to become, resistant to penetration by water and wetting. The term "waterproof" refers to conformance to a governing specification and specific conditions of a laboratory test method. They are usually natural or synthetic fabrics that are laminated or coated with a waterproofing material such as wax, rubber, polyvinyl chloride (PVC), polyurethane (PU), silicone elastomer, or fluoropolymers. Treatment could be either of the fabric during manufacture or of completed products after manufacture, for instance by a waterproofing spray. Examples include the rubberized fabric used in Mackintosh jackets, sauna suits, and inflatable boats.

<span class="mw-page-title-main">Durable water repellent</span> Fabric finish

Durable water repellent, or DWR, is a coating added to fabrics at the factory to make them water-resistant (hydrophobic). Most factory-applied treatments are fluoropolymer based; these applications are quite thin and not always effective. Durable water repellents are commonly used in conjunction with waterproof breathable fabrics such as Gore-Tex to prevent the outer layer of fabric from becoming saturated with water. This saturation, called 'wetting out,' can reduce the garment's breathability and let water through. As the DWR wears off over time, re-treatment is recommended when necessary. Many spray-on and wash-in products for treatment of non-waterproof garments and re-treatment of proofed garments losing their water-repellency are available.

<span class="mw-page-title-main">SympaTex</span>

SympaTex is a type of fabric that is branded as waterproof but "breathable", made or licensed by SympaTex Technologies GmbH a company founded in 1986. The fabric features a waterproof, windproof and breatheable membrane that is laminated to fabrics either on its inner surface or sandwiched between two fabric layers. The latter system offers greater durability, by better protecting the integrity of the SympaTex layer from abrasion to both the outside and the inside of the garment.

Windstopper is a windproof breathable fabric laminate made by W. L. Gore & Associates. One of its most common applications is a lamination with polar fleece, to compensate for fleece's lack of wind resistance.

<span class="mw-page-title-main">Nonwoven fabric</span> Sheet of fibers

Nonwoven fabric or non-woven fabric is a fabric-like material made from staple fibre (short) and long fibres, bonded together by chemical, mechanical, heat or solvent treatment. The term is used in the textile manufacturing industry to denote fabrics, such as felt, which are neither woven nor knitted. Some non-woven materials lack sufficient strength unless densified or reinforced by a backing. In recent years, non-wovens have become an alternative to polyurethane foam.

<span class="mw-page-title-main">Tuilik</span> Watertight jacket used when paddling a kayak

A tuilik is an Inuit watertight jacket, used when paddling a kayak. It is sealed at the face, at the wrists and around the cockpit coaming. In this way the paddler can capsize and come back upright without getting wet, and without getting any water into the kayak.

Layered clothing is the wearing of multiple garments on top of each other.

Ventile, is a registered trademark used to brand a special high-quality woven cotton fabric first developed by scientists at the Shirley Institute in Manchester, England. Originally created to overcome a shortage of flax used for fire hoses and water buckets, its properties were also useful for pilots' immersion suits, but expensive and leaky if exposed to sweat or oils.

Breathability is the ability of a fabric to allow moisture vapor to be transmitted through the material.

<span class="mw-page-title-main">OMNOVA Solutions</span> American chemical company

OMNOVA Solutions Inc., is a global manufacturer of laminates, performance films and coated fabrics. OMNOVA was founded in 1999 when GenCorp spun off its Decorative & Building Products and Performance Chemicals businesses into a separate, publicly traded company. OMNOVA's world headquarters is located in Beachwood, Ohio; with additional sales, manufacturing and distribution locations throughout Europe and Asia.

<span class="mw-page-title-main">Waxed cotton</span> Sturdy fabric waterproofed with wax

Waxed cotton is cotton impregnated with a paraffin or natural beeswax based wax, woven into or applied to the cloth. Popular from the 1920s to the mid-1950s, the product, which developed from the sailing industry in England and Scotland, became commonly used for waterproofing. It has been replaced by more modern materials but is still used by the country sports community. There are two main drawbacks: waxed fabric is not very breathable, and it tends to be heavier and bulkier than modern synthetic waterproof materials.

Páramo Directional Clothing is a British outdoor clothing company. It was founded by Nick Brown, who also started the Nikwax waterproofing products company.

<span class="mw-page-title-main">Oilcloth</span> Type of cloth with a waterproof coating

Oilcloth, also known as enameled cloth or American cloth, is close-woven cotton duck or linen cloth with a coating of boiled linseed oil to make it waterproof.

<span class="mw-page-title-main">PVC clothing</span> Clothing made from PVC fabric

PVC clothing is shiny clothing made from the plastic polyvinyl chloride (PVC). PVC plastic is often called "vinyl" and this type of clothing is commonly known as "vinyl clothing". PVC is sometimes confused with the similarly shiny patent leather.

References

  1. 1 2 3 4 5 6 7 "Kayarchy - clothing & tow-belt (2)".
  2. 1 2 3 4 5 A GUIDE TO HIGH PERFORMANCE POLYURETHANE UPHOLSTERY FABRICS
  3. 1 2 3 C, Geoff (13 March 2022). "The Definitive Guide that You Never Wanted: Backpack Fabrics". Medium. Retrieved 18 June 2022.
  4. "What is PUL?". www.greenandhappymom.com. Retrieved 2021-07-22.
  5. Polyurethane Film Paint Protection
  6. "How Does Rainwear Work?".
  7. 1 2 "FAQ: Acrylic, Polyurethane and Silicone Proofing Techniques".
  8. "Backpack Polyurethane (PU) Coatings Information". www.whitemountain.com.au. Archived from the original on 2017-02-19.