Cannon developed its first Model "HE" electronic, high-pressure, closed-loop piston-dosing unit in 1983 and introduced it to the world at NPE 1985. The machine was supplied with a closed-loop regulation system which enabled accurate control of the speed of the metering pistons thereby guaranteeing constant output and ratio of the components, regardless of pressure fluctuations which might occur in the line. By ensuring the reliability of the component metering as such, Cannon was also able to ensure the quality of the final product.
The ability of the Model "HE" to self-correct was an innovation at the time. Component metering was effected by means of hydraulically-driven metering pistons. Oil was taken from the hydraulic reservoir and, driven by a single motor / pumping unit and sent to the proportional valves, one per cylinder. Each proportional valve immediately dispensed the amount of oil necessary, according to the output required, for the component to be metered by its corresponding cylinder. An encoder was used to measure the speed and position of the cylinder and, given the high resolution of the digital system employed, defined its output with extreme precision. The position control card (CCP) compared this value with the one stored in the metering unit's processor. If differences between the theoretical and actual data were found, the servo-drive responded immediately by dispensing more or less hydraulic fluid through the appropriate proportional valve in order to correct the corresponding component output. The Model "HE" controls initiated an internal check every 28 milliseconds, delivering multiple self-analysis prior to a shot being taken. If the machine determined that it would not be able to make a correct shot, it would not permit materials to be dispensed; this feature eliminated the wasteful consumption of expensive materials and the need for subsequent product quality inspections.
At the time, this technology was particularly suited to the automotive industry with their needs for higher quality, lower costs and the ability to compete in a global marketplace. In 1985, the first two Model "HE" metering units were purchased by UTA (formerly Sheller Globe) and were used to produce automotive interior parts.
The Model "HE" was immediately successful and has proven to be irreplaceable when filled, abrasive, highly emulsified or high viscosity systems were involved; more than 200 have been sold worldwide. Since that time, this metering unit has become the benchmark for the development of other similar machines within our industry and the stepping stone for further advancements at Cannon.
In 1995, in keeping with the highly successful attributes of the Model "HE", Cannon introduced their new "HE-System" which is everything that the original version was but now incorporates a Allen-Bradley controls, delivering even greater processing flexibility. In its 18 years of servicing the industry, it has become the standard for the window encapsulation market as well as several others with various units (the HE-60, HE-90, HE-120, HE-180, HE-360 and HE-700) available to address the needs of each application.00/HESys