To mY PResentation

AMIT BISWASID : 143003014Department of Textile EngineeringGreen University of Bangladesh

WELDINGMACHINE

INTRODUCTION

• ultrasonic welding is an industrial technique whereby high-frequency ultrasonic acoustic vibrations are locally applied to work pieces being held together under pressure to create a solid-state weld.

a logical connection of a woven or a knitted fabricalways continuous..

either press type and or continuous tool depending

No SewSewing

Hot Wedge

Hot Air Ultrasonic Hot Air Taping Laser

Welding-parameters:• Roller pressure• Speed• Temperature

Welding-parameters:• Roller pressure• Speed• Temperature• Hot air flow

Welding-parameters:• Roller pressure• Speed• Amplitude• (Style of wheel)

Welding-parameters:• Roller pressure• Speed• Temperature• Hot air flow

Welding-parameters:• Roller pressure• Speed• Laser energy

Principle of Ultrasonic Welding

• In ultrasonic welding, frictional heat produced by the ultrasonic waves and force is used for the joining process. Ultrasonic waves (15 to 60 khz) are transferred to the material under pressure with a sonometer. Welding times are lower than 3 s. The welding can proceed with or without the application of external heat.

  •eliminate fraying •eliminate burns on fabrics •eliminate emissions of toxic fumes •eliminate the waiting time for the warm up of the machine •reduce production time •reduce energy consumption •eliminate the use of thread in the seam •coupling two fabrics and/or a fabric and a film •simultaneously punch and weld synthetic fabrics •eliminate the selvage •simultaneously cut and weld synthetic fabrics

Ultrasonic cutting and sewing allow to:

THE REQUIREMENTS OF WELDING

• ULTRASONIC TECHNOLOGY CAN BE USED ON FABRICS MADE JUST OF 25% OF SYNTHETIC FIBERS , LIKE POLYESTER, VISCOSE OR RAYON.

• THERMOPLASTIC MATERIALS USED

Most synthetic fabrics suitable ultrasonic welding contain thermoplastic materials with similar melting temperatures and compatible molecular structures.  

These materials have many of the following characteristics :•Wide melting range •High coefficient of friction •Even thickness •At least 25 % of thermoplastic content •Sufficient stiffness and thickness to accept the energy on the interface of the material ( minimum 0.0127 mm/ 0.0005 inches)

Ultrasonic Welding 1990 – Today

8304-082 8312

The application of welding machine

• For edge neatening of fabrics• For joining of motif• For sealing the edge of ribbon or lace• For making tie• For shaping the parts of garments• For making button hole

Ultrasonic Welding