P-455

Description of operation

Wire and non-woven fabric are fed from swifts and processed into pocket spring strings. Prior to the coiling process, the wire is heat-treated between 4 electrodes. This heat treatment eliminates the tension generated in the wire during coiling and thus reduces the setting loss. The hot wire is pre-programmed to coil to a predefined spring, cut and transported into a cooling wheel using the stacking device. The springs are cooled down via air circulation and then transported to the fabric track, where a loading slider slides the now cooleddown spring into a prepared fleece tube. The pockets are generated using ultrasonic welding units, and the endless pocket spring string exits the machine for further processing, e.g. on the versatile Spühl assembly machine PA-490.