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Sweater dyeing
This presentation discusses the process of dyeing sweaters. It is presented by four students and discusses how sweaters are dyed by adding color to the fibers, yarns and fabrics in a solution containing dyes and chemicals. It then provides examples of different dyes used for sweater dyeing and the recipe for dyeing sweaters. It also describes some of the main machines used for sweater dyeing like paddle dyeing machines and rotary drum dyeing machines. Finally, it lists some sweater dyeing industries in Bangladesh and discusses advantages and disadvantages of sweater dyeing.
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Sweater dyeing
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- 2. Presented by, • Md.Shohrab Hossain (Student Id; 172216) • Abu Sayed Rafi (Student Id; 172217) • S. M. Zaki Mujahid (Student Id; 172219) • Md. Al-Arafin Kaosad (Student Id; 172220) 3/11/2020 2
- 3. • Sweater dyeingis the process of adding color to the fibers, yarns, and fabrics of a sweater. This dyeing is normally done in a special solution containing dyes and particular chemical materials. After dyeing, dye molecules have uncut chemical bond with fiber molecules due to temperature & time. • Sweater has contributed 11.98% to overall readymade garment exports of $30.62 billion. 3/11/2020 3
- 4. Figure: From yarnto finished sweater 3/11/2020 4
- 5. Some Dye (Color)Used in Sweater Dyeing Teal Blue Teal Green Powder Liquid 1 pkg royal blue ½ cup royal blue 1-½ tsp kelly green 2 tbsp kelly green Powder Liquid 1-½ pkg kelly green ¾ cup kelly green 1 tbsp. royal blue ¼ cup royal blue Tiger Lily Violet Powder Liquid 1 pkg tangerine ½ cup tangerine 1 tbsp petal pink ¼ cup petal pink Powder Liquid 1 tbsp purple ¼ cup purple 2 tsp fuchsia 2 tbsp. fuchsia 3/11/2020 5
- 6. Recipe of SweaterDyeing • Detergent • Soda Ash • Caustic Soda • Hydrogen Per Oxide • Stabilizer • Temperature • Processing time 0.5 g/l 2.0 g/l 3 g/l 3 g/l 1.5 g/l 90 °C 40 minute 3/11/2020 6
- 7. Process of SweaterDyeing (Pretreatment) 3/11/2020 7
- 8. Process of SweaterDyeing 3/11/2020 8
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- 10. Cont…. 3/11/2020 10 enzyme +acetic acid temp @50 degree
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- 16. Sweater Dyeing Machine •Paddle Dyeing Machine; • Rotary Drum Dyeing Machine; • Tumbler Dyeing Machines etc. 3/11/2020 16
- 17. Paddle Dyeing Machine •A process of dyeing textiles in a machine that gently move the goods using paddles similar to a paddle wheel on a boat. • This is a slow process, but there is extremely little abrasion on the goods. • Horizontal and lateral are two types of paddle machine. • Here temperature can be increased upto 98 ºC. 3/11/2020 17
- 18. Working Principal • HTPaddle Machines work according to the principle of horizontal paddle machine, however, the temperature can be raised up to 140° C. PES particles are preferably dyed on HT paddles. In paddle machines, the dyeing can be carried out with 30:1 to 40:1, lower ratios reduces optimum movement of the goods, lead to unleveled dyeing, crease formation. For gentleness, the blades of the paddle are either curved or have rounded edges and the rotating speed of the paddle can be regulated from 1.5 to 40 rpm. Circulation of the liquor should be strong enough to prevent goods from sinking to the bottom. Paddle machines are suitable for dyeing particles of all substrates in all forms of make ups. The goods are normally dyed using PP/PET bags. 3/11/2020 18
- 19. A Specification ofPaddle Dyeing Machine Manufactured by Jingjiang Huaxia Technology Co., Ltd. (Haifeng) ($ 8500) • Brand Name: HTAI • Power(W): 370w • Dimension(L*W*H): 920*650*1250mm • Weight: 106kg • Place of Origin: China • Voltage: 220V • Certification: ISO 9001 • Material: Stainless steel • The diameter of rubber roller: 130mm • Rubber roller the length: 430mm • Pressure range: 0-7kg • Hardness of roller: 72 degree • Pressure-absorbing rate: 45%-90% 3/11/2020 19
- 20. Rotary Drum DyeingMachines 3/11/2020 20 • Rotary drum machines are sometimes preferred for garments, which require gentler handling, such as sweaters. • These machines work on the principle of “movement of textile material and a stationary liquor". • The rotary drum dyeing machine consists of rotating perforated cylindrical drum , which rotates slowly inside a vessel of slightly bigger in size. The internal drum is divided into compartments to ensure rotation of goods with the drum rotation, and the outer vessel holds the required quantity of dye liquor. High temperature drum machines are capable of processing the garments up to 140° C.
- 21. Figure of RotaryDrum Dyeing Machine 3/11/2020 21
- 22. Features of ModernRotary Dyeing Equipment • Lower liquor ratio • Gentle movement of goods and liquor (minimizes surface abrasion) • Rapid heating and cooling • Centrifugal extraction • Variable drum speed with reversal capability (adaptable to a wide variety of goods) • Continuous circulation of goods (improves migration control) • Easy of sampling • Variable water levels with overflow rinsing capabilities • Large diameter feed and discharge lines (minimizes filling and draining time) • Microprocessor controls • Lint filters • Pressure dyeing • Auto-balancing drums 3/11/2020 22
- 23. A Specification ofRotary Drum Dyeing Machine Manufactured by Nantong East Heptanoic Machinery Co., Ltd (Shuangfa) ($100000 - $120000) • Power(W): 7.5kw • Dimension(L*W*H): 1040*730*1500mm • Weight: 600kg • Place of Origin: Jiangsu, China • Brand Name: Donggeng • Voltage: 380V • Certification: Chinese Certificate • Material: Stainless Steel • Working Temperature: 140-145 ° C • working pressure: .75x105Pa • Low Liquor Ratio: 1:6 - 1:8 • Capacity: 15~2000kg 3/11/2020 23
- 24. Tumbler Dyeing Machine •These machines are being used for small garments either in loose form or in open mesh bags. • Design wise the tumbler dyeing machines are similar to the commercial laundering machines. • The principle of operation is to load the material into perforated inner SS tanks , which rotates round a horizontal shaft fixed at the back of the drum. The drum is divided into compartments for moving the goods with rotation of drum. 3/11/2020 24
- 25. Some Sweater DyeingIndustries in Bangladesh • Galaxy Sweaters & Yarn Dyeing Ltd., Uttara, Dhaka • DBL Group, Gulshan, Dhaka. • Maa Knitting & Dyeing Industries Ltd., 39, Siddeshwari, Dhaka • Golden Times Sweater & Dyeing Ltd. • Far East Knitting & Dyeing Industries Ltd., Gazipur 3/11/2020 25
- 26. Advantages • Handling ofsmaller lots economically. • Enables various special effects to achieved. • Distressed look can be effectively imparted. • Unsold light shades can be converted into medium and deep shades. • By the time the garment has been in a boiling dye bath and then tumble-dried, it will have adopted its lowest energy state and will not suffer further shrinkage under consumer washing conditions. • Latest fashion trends can be effectively incorporated through garment wet processing by immediate feedback from the customer. 3/11/2020 26
- 27. Disadvantages • High costof processing • A little complicated dyeing 3/11/2020 27
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