LEARNING Sizing process (Textile knowledge and technology)টেক্সটাইল জ্ঞান tekstil ความรู้ด้านสิ่งทอ

Summary

The sizing process in weaving involves applying a solution to warp yarns to enhance strength and reduce hairiness, especially for cotton yarn. The sizing machine consists of a beam cre, size box, drying chamber, and winding section. It regulates yarn tension, applies size, and dries the yarn through steam rolls. Key components include warp beam brakes, yarn separation rolls, adjustable reed, and a press roll for controlling yarn density. The control panel enables precise adjustments to parameters such as winding speed, moisture content, and drying temperature, ensuring optimal yarn treatment during the weaving process.

Takeaways

• 😀 Sizing is the process of applying a size solution onto the warp yarn surface to improve strength and reduce hairiness.
• 😀 During weaving, warp yarns are under high tension and abrasion, which is why sizing is crucial, especially for cotton yarn.
• 😀 A sizing machine consists of four main sections: beam cre, size box, drying chamber, and winding head.
• 😀 The warp beams are mounted on a beam cre, and pneumatic war beam brakes help control warp tension and speed.
• 😀 The brake system in the sizing machine can stop the beam instantly to prevent rotation due to inertia.
• 😀 A cooked size solution is pumped into the size box, and it is applied to the yarn using application rollers.
• 😀 Temperature and yarn tension in the size box must be carefully controlled during the sizing process.
• 😀 After sizing, the yarn passes through steam rolls in the drying chamber for efficient drying.
• 😀 Yarn separation rolls at the front end of the machine ensure a uniform layout for winding the yarn onto the beam.
• 😀 The adjustable reed and press roll control the width and density of the warp wound onto the beam.
• 😀 A stamping device marks the warp length, helping operators cut the fabric into rolls of the required length.
• 😀 The control panel at the front of the machine allows operators to adjust parameters like winding speed, tension, moisture content, and size add-on.

Q & A

What is the main purpose of sizing in the weaving process?

The main purpose of sizing is to apply a solution to the warp yarn's surface, increasing the yarn's strength and reducing hairiness during weaving, where the yarn experiences high tension and abrasion.

What are the four main sections of a sizing machine?

A sizing machine is typically composed of four sections: the beam cre, size box, drying chamber, and winding head.

How do pneumatic brakes on the beam cre affect the warp tension?

The pneumatic brakes on the beam cre help control the warp tension by adjusting the warp let-off speed, and they can stop the beam instantly to prevent excessive rotation due to inertia.

What role does the size box play in the sizing process?

The size box contains the cooked size solution, which is pumped into it and applied to the yarn by application rollers. It's essential to control the temperature and yarn tension during this application for optimal results.

Why is good contact with the steam rolls important in the drying chamber?

Good contact with the steam rolls is crucial for effective drying of the yarn. The yarn should have sufficient contact with the steam roll surface to ensure thorough drying after the size application.

What is the function of the yarn separation rolls in the sizing machine?

The yarn separation rolls separate the warp sheet into individual yarns to ensure a uniform layout for winding onto the beam.

How do the adjustable reed and press roll contribute to the winding process?

The adjustable reed controls the width of the warp being wound onto the beam, while the press roll controls the warp density, allowing more yarn to be wound onto the beam.

What is the purpose of the stamping device in the sizing machine?

The stamping device marks the warp length, which helps the operator cut the continuous fabric into required lengths during the weaving process.

Which parameters can be controlled at the control panel of the sizing machine?

At the control panel, parameters such as winding speed, tension, moisture content, cre tension, drying temperature, and size add-on can be controlled to ensure optimal machine performance.

Why is it important to maintain proper temperature and tension in the size box?

Maintaining proper temperature and tension in the size box is crucial for consistent size application, ensuring the yarn is treated effectively and results in improved strength and reduced hairiness.