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LEISTER Technologies AG
Laser Textile Welding

Laser Textile Welding

Product catalog summary

Introduction to Laser Textile Welding
Laser textile welding is an innovative method used in the textile industry to join synthetic fibers made from thermoplastic polymers. This technique involves laser transmission welding, where a transparent part and an absorbing part are joined. The laser beam penetrates the transparent material, melting the absorbing material, and creating a firm bond as the materials solidify.

Basic Principle of Laser Transmission Welding
The process involves a laser beam passing through a transparent material to an absorbing material, causing the latter to melt. The external clamping force ensures physical contact between the materials, allowing them to mix and solidify into a strong bond. The precision of the laser ensures minimal impact on surrounding materials.

Advantages of Laser Seaming
Laser welding creates stitch-free seams that are more flexible and softer than traditional thread-based seams. It eliminates the need for additional sealing tape, as no needle holes are present. The heat is generated precisely where needed, reducing damage to thin membranes and maintaining the integrity of breathable fabrics.

Applications in Textile Manufacturing
Laser transmission welding is used for laminating layers, reinforcing pads, and attaching fasteners like Velcro. It is particularly beneficial for thin, breathable membranes, as it avoids mechanical damage and blockage. The technique can create full-faced laminates or patterned laminates using a shadow mask.

Seaming and Laminating Techniques
For two-dimensional workpieces, a turn-key system can be used, while larger formats benefit from integrating the GLOBO optics on a cutting table. For three-dimensional geometries, the GLOBO optics can be robotically moved or integrated into a C-frame sewing machine, allowing manual guidance of textiles.

Catalog excerpts

LASER PLASTIC WELDING Laser Textile Welding

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Basic principle laser transmission welding Laser radiation Joining pressure Most synthetic fibers in textile industry are made out of thermoplastic polymers and can be welded therefore. In laser transmission welding of thermoplastics a part transparent to the laser and one absorbing are joined together. The laser beam penetrates through the transparent material and impinges on the absorbing material, which melts due to the absorbed laser energy. By the applied external clamping force the transparent material is in physical contact with the absorbing one and melts as well. The polymer melts mix...

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