dcsimg Covestro - Films - Welding

Makrofol®, Bayfol®, Dureflex® and Platilon®

Welding

Ultrasonic Welding (PC- and TPU-Films)

The sonotrode transfers the vibrations produced by the generator to the film to be welded and introduces the vibration into the weld seam. There, the vibration is converted into friction and heats the film within a very short time. The pressure of the sonotrode enables simultaneous joining and cooling of the seam.

Applications where Makrofol® DE film may be ultrasonic welded include: medical packaging, visors protective housings, etc.

Applications where Dureflex® and Platilon® film may be ultrasonic welded include: cutting and welding of parts like gloves, tubes, welding of bags with individually shaped seams.

Heat Sealing (Hot Platen) (TPU-Films)

Heat sealing, or hot platen sealing, joins Dureflex® and Platilon® film or composite laminates by heating areas under pressure until fusion occurs.

Applications where Dureflex® and Platilon® film may be heat-sealed include: bags, mattresses, letters and numbers for uniforms and clothing, prostheses probe sheathing; and flexible / reinforced industrial hose.

HF Welding (TPU-Films)

Dielectric high frequency (HF) welding or sealing, uses a rapidly alternating, high-energy electromagnetic field to stimulate the molecules of two overlapping layers of standalone or laminate constructions. The stimulated molecules create localized heat, causing the two layers to fuse together at the point of contact, creating a weld. After the weld cools, the bond is as strong as the original materials.

Applications where Dureflex® and Platilon® film may be HF welded or sealed include: protective clothing, shoe components, gel- and foam-filled cushions, surgical pouches, bellows, lumbar support, hydration reservoirs, inflatable boats, and medical and commercial mattresses.

Laser Welding (TPU-Films)

In the case of the most common process of transmission laser welding, the upper film must be transparent for the laser wavelength. The lower film must absorb the laser waves. The lower film softens and passes the heat on to the upper film. Bringing a suitable level of pressure to bear enables the film to be joined. Laser welding is among the most rapid of continuous welding processes.

Applications where Dureflex® and Platilon® film may be laser welded include: cutting and welding of parts like gloves, tubes, welding of bags with individually shaped seams

Heat Impulse Welding (TPU-Films)

In the case of the heat impulse process, the Dureflex® and Platilon® film to be welded is heated and joined by means of an insulated band heater through which electricity flows for a short time. In contrast to hot platen sealing, the welding tool is only heated for the duration of welding.

Applications where Dureflex® and Platilon® film may be welded by heat impulse include: medical bags and sealing seams.


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