"Cold" Corrugated--Application of Ultrasonic Technology in Tile Line (1)

"Cold" tile lines can reduce the processing of corrugated board, reduce investment costs and operation and maintenance costs, and reduce energy consumption. However, despite the above-mentioned many advantages of "cold" tile lines, after more than 40 years of research, it has still failed to achieve convincing results. So, can the ultrasonic welding technology used for plastic film, some non-woven materials and artificial fiber textiles for a long time been used to produce corrugated board? BHS has been investing in the development of corrugated board that can produce wider paperboards and can process faster. The production line is very concerned about its market potential. Therefore, BHS has formed a research team to research and develop this new technology. The team members are members of the University Research Institute and technical experts in the corrugated board industry.

The team went straight to the topic of research since the beginning of the study—the problem of the adhesion of corrugating medium to face paper. Assume that bonding a corrugating medium paper and face paper within one minute on a tile line with a production speed of 300 meters per minute means that the impact of the ultrasonic spray head (also called the ultrasonic contact) on the paper is less than 0.2. Milliseconds (0.0002 seconds). 0.2 milliseconds is almost the same as the action time of a pressure roller on a conventional single-sided machine, although the production process of a conventional single-sided machine includes a warm-up process. One of the goals of using ultrasonic bonding technology is to eliminate the effect of residual moisture (currently single-sided machines contain moisture in the production of corrugated cardboard), and moisture often affects the flatness of the board. Compared with the traditional corrugated board processing process, ultrasonic technology has the following advantages:

No paste is required, eliminating the effect of moisture on the paperboard process. No preheating of corrugating rollers Reduces the occurrence of cardboard warpage. No single-sided paperboard without adhesiveness when the machine restarts

(A) Ultrasonic equipment

For practical application considerations, this research project is limited to the use of longitudinal ultrasonic contacts or roller ultrasonic contacts. (see picture 1)

In actual production, ultrasonic waves are generated by a bonding unit. The gluing unit includes an ultrasonic generator, a processor, a supercharger, and an ultrasonic contact. Ultrasonic generators generate ultrasonic waves, and the processor continuously monitors and controls the amplitude and wavelength of the ultrasonic waves (because the uncontrolled amplitude increase will severely damage the entire system). The supercharger expands the amplitude at the ultrasonic contact to obtain the amplitude required for production. At the end of the ultrasonic contact, which is the end of the system, a frequency modulation (such as the action of a supercharger) must be performed to cause the wavelength to resonate. Ti-3A1-4V produced from titanium is usually used to achieve the highest ultrasonic amplitude. Ultrasound resonance is mechanical and must be transmitted directly to the material by pressure and adhered on the support anvil. In this case, the anvil pad is the rotating upper corrugating roller/)

(to be continued)