Impulssilämpötiivistys

Impulssilämpötiivistys, also known as thermal impulse sealing, is a method used to join materials, typically thermoplastics, by applying heat and pressure for a very short duration. This process is characterized by the rapid heating of the sealing jaws and their immediate cooling after the impulse. The heat is generated by passing an electric current through a resistance element embedded in the sealing bar, which quickly reaches the desired temperature. Simultaneously, pressure is applied to the materials being sealed.

The short duration of the heat application is crucial for preventing degradation of the material and ensuring a strong, localized bond. Once the impulse is complete, the sealing jaws are often cooled to rapidly solidify the molten material, creating a permanent seal. This technique is widely used in packaging applications, such as sealing plastic bags, pouches, and films. Its speed and efficiency make it suitable for high-volume production lines. Impulssilämpötiivistys can be used for various thermoplastic materials, including polyethylene, polypropylene, and PVC, provided they have appropriate melting characteristics. The precise control over heat, pressure, and time allows for consistent and reliable seals across different material thicknesses and types. This method is valued for its ability to create hermetic seals, preserving the contents of packaging.