Polyurethane laminate

From Wikipedia, the free encyclopedia
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]

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[edit]

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]

Materials and degradability[edit]

There are many different polyurethane blends and resin types,[5] 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).[6] 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.[6] 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.[7][3]

See also[edit]

References[edit]

  1. ^ a b c d e f g "Kayarchy - clothing & tow-belt (2)".
  2. ^ a b c d e A GUIDE TO HIGH PERFORMANCE POLYURETHANE UPHOLSTERY FABRICS
  3. ^ a b c 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. ^ "How Does Rainwear Work?".
  6. ^ a b "FAQ: Acrylic, Polyurethane and Silicone Proofing Techniques".
  7. ^ "Backpack Polyurethane (PU) Coatings Information". www.whitemountain.com.au. Archived from the original on 2017-02-19.