**3.3. Time**

It is important that between the fabrics a suitable intermediate temperature is reached. This can be obtained by the manipulation of the time of heating at the constant temperature settings. The time depends on the type of adhesive, type and thickness of the fabric, its thermal conductivity, and the mutual action of pressure and temperature [7, 11].

developed a new, innovative heating control system, **Figure 5**. It is intergraded in FX Diamond continuous fusing machine [14]. The new control element measures the temperature directly at the belt and therefore reacts extremely fast to any changes. The preset temperature can be

Applying Heat for Joining Textile Materials http://dx.doi.org/10.5772/64309/ 223

For materials, sensitive to pressure, a combination of FLEXO and standard pressure systems were integrated into the continuous fusing machine, **Figure 6**. The air‐filled FLEXO rollers offer flexibility as they adjust to the fabric thickness. Both FLEXO and standard pressure rollers

In order to create a welded area by hot air a heat‐transfer mechanism is applied between two thermoplastic surfaces by shaped or perforated nozzle to deliver hot air to heat between fabric surfaces before they are pressed between driven rollers to apply pressure and complete the welding. Hot wedge welding uses an electrically heated wedge that contains one or more cartridge heaters. The drive rollers pull the fabric through the machine and press the heated

maintained at a constant level and be precisely controlled.

**Figure 5.** Heating zone integrated in FX Diamond continuous fusing machine [14].

**Figure 6.** FLEXO Double Pressure System DXT 1400L/1600 CFC [14].

**4.2. Hot air/welding machines**

surfaces together, **Figure 7** [1].

operate independently from each other and allow continuous loading [14].

### **3.4. Cooling**

Cooling is a very important process at the end of the technological process. In praxis, two types of cooling can be applied. Cooling presents the time needed for stabilizing the inner micro‐ structure of the heated textiles and adhesive resins. The most time consuming is living the assembles after heating on flat, horizontal area at least 24 h in the environmental temperature. The enforced cooling can be carried out by water‐cooled plates, forced‐air circulation, and vacuum. The assembly should be cooled in a horizontal plane [7, 11].
