Man has been growing and weaving cotton into fabrics for centuries with its earliest production being traced back to India around 4000BC.
The process in which cotton is transformed from a fibre into the products that we make takes place over three steps. First, a cotton gin is used to separate the cotton fluff from the plant seed then spinning machines (which were invented during the Industrial Revolution) are used to spin the cotton fibres into yarn at a fast rate. Finally, the cotton thread is woven with a loom to create the fabrics that we use today.
The fabric is naturally Ecru in colour due to some of the seeds getting crushed into the cotton and is typically referred to as grey fabric in the industry. This grey fabric can then be used as it is or can be bleached (RFD Fabric), dyed (to Pantone colours) and given the appropriate finish as required.
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Cotton is easy to care for which is another reason why it’s such an appealing material.
Often the specific care advice will vary between each product so it is important to read the label but there is a general consensus that handwashing is always best.
However, if you are using a washing machine, put it on a gentle cycle with cold water (30°C or below) and eco-friendly detergent. This will prevent shrinking and colour fading.
Cotton can be air-dried or machine dried as long as a moderate to low heat is used.
Cotton is available in various weights ranging from 110 gsm to 180 gsm cotton. The weight of the material does not always determine its quality as different weaves are suitable for different products.
The metric measurement for the weight of cotton is GSM which is Grams per Square Metre or the imperial measurement would be OZ which is Ounce per Square Yard. The most popular cotton weights are:
Typically tends to be muslin fabric which is very light weight and hence has also got very little strength.
Light weight cotton which is typically used as lining or for cheaper price focussed products.
The most popular weight of cotton used as it provides the flexibility as well as as the strength needed to make many products. This weight of cotton is widely produced making it the most cost-effective option.
This is heavier cotton where the product needs to look more premium than a regular one.
Cotton can be dyed to any colour once it has been bleached. This is done to ensure that any colour applied does not have a base colour to hide. Cotton is dyed in batches and even when utmost care is taken to ensure uniformity of colour, this can never be guaranteed as there is always a slight difference from batch to batch due to the absorption variances of cotton as it is a natural product.
The Pantone colour system is used to typically state the colour to which the fabric is dyed, usually TCX or Solid Coated Pantone references.
The cost of dyed fabric is higher as apart from the extra processing costs, the fabric does shrink considerably resulting in increased cost. All dyeing factories also need to follow very strict regulations in ensuring that no hazardous chemicals reach the natural water system. This is done by having an ETP water treatment system.
Fibre-reactive dyes form strong covalent bonds with cellulosic fibres, which result in good wash fastness. Reactive dyes are subject to hydrolysis, which is the chemical reaction of the dye with the water. Hydrolysis must be controlled for dye optimisation. A wide range of reactive dye chemistries is available, resulting in a range of performance attributes.
Direct dyes also are commonly used for cotton. Direct dyes are easy to apply, so dye cycles tend to be short and economical, and a wide range of colours can be applied. However, direct dyes have limited brightness and poor chlorine fastness, and they require after-treatments to achieve adequate wash fastness. Because direct dyes are attached to cotton fibre by weak forces, they are very sensitive to temperature during the dyeing process. Direct dyes are especially useful for pastel shades and lightfastness.
Vat dyes have no initial affinity for cotton and need to be changed chemically (“reduced”) to make them soluble and able to adsorb to and diffuse into the fibre. Once inside the fibre, vat dyes are oxidised back into an insoluble form. In contrast to direct dyes, vat dyes produce good wash fastness.
Sulphur dyes are similar to vat dyes in that they have to be made soluble before they can be applied. Compared with vat dyes, they are easier to reduce but harder to oxidise. Sulphur dyes tend to be inexpensive, but are sensitive to chlorine and are subject to colour loss with abrasion, which leads to poor crock fastness. Lightfastness is poor for the light shades but good for the darker shades. Sulphur dyes are widely used for navy blue and dull green shades and are the industry standard for black.
Pigments are totally insoluble in water, show no affinity to any fibre, and do not penetrate the fibre. They are used to apply colour to the surface of a fabric or garment, typically by printing. Pigments must be applied with a binder; however, too much binder can ruin the feel or hand of the fabric. Pigments allow for the production of intense fluorescent colours. Fabrics coloured with pigments have good lightfastness and are not sensitive to chlorine.
Finishing, as the term implies, is the final step in fabric production. Hundreds of finishes can be applied to textiles, and the methods of application are as varied as the finishes.
Cotton fabrics can probably be finished in more ways than any other type of fabrics. Some finishes change the look and feel of the cotton fabric, while others add special characteristics such as durable press, water repellency, flame resistance, shrinkage control and others. Several different finishes may be applied to a single fabric.
Is a cotton fabric that has been brushed to yield an incredibly soft texture similar to cashmere and other high-end fabric in the industry. Usually, will regular cotton is made; it is passed through a flame to get rid of the raised fibres and create a smooth surface. However, brushed cotton receives different treatment where instead of removing the raised fibres, manufacturers exaggerate them. This is done through special mechanised metal brushes that spin the fibres from the fabric’s surface.
Chemical finishing techniques are available to improve function and properties:
Mercerising – cotton fibres are treated with a solution of sodium hydroxide, making them stronger, softer and more lustrous
Crease Resistance – cellulose fibres, such as cotton, crease badly and treating the fabric with a resin-based finish reduces how much the fabric creases
Shrink Resistance – to prevent wool fibres shrinking when washed they can be treated with chlorine, which removes the scales of the wool fibres that cause the shrinkage
Stain Resistance – a silicone-based spray can be used to prevent grease and dirt clinging to the fibres and is usually sprayed on after a product has been manufactured
Flame Resistance – most fibres burn and could be a potential death hazard- by law upholstery fabric has to be treated with a flame-resistant finish
Water Repellency – silicones (a tough synthetic material) are applied to a fabric’s surface to temporarily prevent water being absorbed by the fabric; PVC can coat the fabric to make it permanently water proof but doesn’t allow the skin to breathe
Cotton can be easily branded with your artwork. Choose from a range of print techniques :
• Classic Screen Printing
• Digital Printing
• Transfer Printing
• CMYK Printing
• Tonal Printing
• Foil Printing
• Glitter Printing
Cotton can be supplied in various weaves, each giving the fabric a unique finish. Take a look below at the most popular cotton fabrics:
- Standard Cotton
- Duck Canvas
- Cotton Twills & Drills
- Slub/ Dobby Fabric
- Melange Cotton
We can provide cotton with various certifications such as:
- Organic Global Textile Standard (GOTS)
- All projects
Whatever your project, Bag Maverick can deliver