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THREADS
Threads are yarns that are used for sewing a garment or for embroidery. Threads are classified into qualities and types. A lot of heat and frictions is created during sewing (or embroidery). Threads are prone to abrasion and breakage. Threads are lubricated to protect threads from heat and friction created during sewing.
THREAD PACKAGES
Depending upon thread quantities required, thread is packaged into tubes, cops or cones.
Tubes: Thread is wound on cardboard tubes in quantities of 50mtrs to 1000mtrs. These tubes are in turn packed 10tubes to each box.
Cops: Thread is wound on plastic cops in quantities starting 2000mtrs to 5000mtrs. Cops are usually used for embroidery threads
Cones: Thread is wound on plastic or cardboard cones in quantities starting at 2000mtrs.

THREAD QUALITIES
Depending upon their usage, threads are divided into either SEWING OR EMBROIDERY threads.

SEWING THREADS: Are classified into different qualities based on the fiber content of threads. Sewing Thread by quality are:
1.    Cotton
2.    Polyester
3.    Nylon
4.    Polyester – Cotton
5.    Polyester – Polyester
6.    Aramid

1.    Cotton Threads: Most commonly used for garment dyeing program where the sewing thread should take the dyed colour. When used in its mercerized form, this thread has lusture and better strength than the soft thread. These threads have the best sewability without any lubricants and finish.
2.    Polyester: This is the most commonly used sewing thread quality in the apparel industry. Polyester thread is preferred due to its characteristics of good strength, colourfastness and versatility in colour options. Polyester threads are spun type threads made with 2-6 plies.
3.    Nylon: This is the strongest thread when not exposed to sunlight. Nylon threads turn brittle quickly when exposed to sunlight frequently. Another dis advantage of nylon threads is less colour options. Both these factors contribute to very less use of nylon thread in apparel sewing. Nylon threads are used in their monofilament form for blind hemming in the apparel industry.
4.    Polyester – Cotton (Poly-cotton): These threads are used when the characteristics of both cotton (sewability) and Polyester(strength) are required in sewing thread. These threads construction is the Core-spun method. In Core-spun thread type, the cotton thread plies are spun around (or wrapped around) a core of polyester filament yarn. The biggest advantage of using core spun Poly-cotton thread is the very low strength to thread size ratio. That is, we can use finer thread and still achieve the strength of a coarser spun thread. Due to the cotton covering, this thread is most suitable for use in denim, stretch denim and any other heavy fabric.
5.    Polyester-Polyester (Poly-Poly): These threads are used for their extremely good seam strength. These are Core-spun sewing threads. Polyester staple fibers are spun around a core of polyester filament yarns. The biggest advantage of using core spun poly-poly thread is the very low strength to thread size ration. That is, we can use finer thread and still achieve the strength of a coarser spun thread. Due to the polyester covering, this thread has very good abrasion resistance leading to very few thread breakages. Less thread breakages leads to better productivity. This thread is most suitable for use to sew any heavy or extremely heavy fabric, especially when these garments have to undergo heavy industrial washes.
6.    ARAMID threads:  These are basically aromatic polyamides (meta and para aramid) thread. The basic characteristics of ARAMID threads are strength and high resistance to heat. Due to high heat resistance and strength ARAMID threads have high resistance to deterioration in extreme conditions (due to weather or useage or stress). ARAMID threads are most commonly used in sewing of fire retardant, fire proof, soil repellent, soil proof, water repellent and water proof clothing. Popular brands of ARAMID threads are Kevlar or Nomex.

EMBROIDERY THREADS: Are classified into different qualities based on the fiber content of threads. Sewing Thread by quality are:
1.    Cotton
2.    Continuous Filament
3.    Rayon
4.    Metallic
1.    Cotton: Cotton mercerized thread is used when shiny soft thread is required (mostly in hand embroidery)
2.    Continuous Filament ( Trilobal Polyester and Pentalobal Polyester): These threads have the sheen like natural silk and have very good strength. These polyester continuous filament yarns are used for multi head machine embroidery. Trilobal yarn has a trilobal cross-section and Pentalobal yarn has a  pentalobal cross section. Due to this thre threads have high degree of brightness.
3.    Rayon: These threads are used as a substitute of silk threads in hand embroidery as spun rayon threads cost lesser than silk but appear exactly as silk. In domestic machine embroidery, spun rayon thread is preferred due to its availability in tube form.
4.    Metallic: Metallic threads are made by using 12 or 24 micron polyester film with a coating of metallised aluminium with colour coating and resin on it. These threads are basically flat, available in metallic colours and are used in embroidery to add glitter to the embroidery (machine or hand).