processing of paper, plastic film, steel and aluminium to call a few. Hot perforation is just a preferred method for brittle substances such as for example plastic film. Optima has been active in the design of a perforating machine control system. The device was designed to perforate reels of film laminate utilizing a combined heat and pressure process. To achieve this, the film is passed via a nip created between a heated perforating roller and a heated anvil roller. During the perforating process paper is used to safeguard the film from damage. The perforated film is slit into strips and each strip is then wound onto an individual reel.
The Pulsed perforation machine is an independent unit allowing the vertical perforation of products. This revolutionary product may be assembled to perform in line to all automatic creasing and perforating machines, the paper is fed from the creasing machine and transported by an alignment table with a sloping belt and ball cage towards the pulsed perforation assembly ensuring perfect registration. The perforation heads can easily be added as required and mounted onto the pneumatically driven unit. Perforation Tools These perforations may be continuous or pulsed, the exact distance and enough time of the pulse can simply have adjusted utilising the measure settings on the touchscreen display panel. Perforated paper is then delivered onto our collector delivery output unit. The device is mobile on wheels which makes it an easy task to move around in and out of production as required. Line operation The temperature of the anvil and perforating rolls is controlled with a separate stand-alone system. The operator starts these rolls manually and they operate at a fixed idle speed. The rolls remain open before the line runs to avoid burning of the paper or film. The unwind and rewind drives automatically compensate for reduction / build up of product on the reels. Diameter sensors on the paper unwind, film unwind and paper rewind are used below 5% line-speed to preset the respective drives internal diameter calculation blocks. The item rewinds use the diameter sensor on the product rewind A to compensate for diameter build up. Load-cells situated following the paper unwind, following the film unwind, before the paper rewind and following the S-wrap are used to provide feedback of actual web tension. When the perforating nip is open and the film unwind and paper rewind drives are started they act to reach the respective tension setpoints. In addition when the perforating nip is closed and the paper unwind and S-wrap drives are started they act to regulate tension to the respective setpoints. To create the machine the operator runs the film and paper unwinds and the paper rewind at fixed slow speeds using jog pushbuttons located near the devices. Line jog push-buttons on the paper rewind and product rewind push-button stations cause the line drives (all those except the anvil and perforator rolls) to start and the line to perform at a predetermined jog speed with the nip open. Once the machine is threaded and the operator has checked that the anvil and perforating rolls have reached a suitable temperature, the operator starts all the drives from the HMI. When they're started the film unwind, paper rewind and product rewind drives act to tension the net to the relevant tension setpoints on the HMI. When all drives are enabled the operator presses line start at the HMI. A line-start alarm sounds for 3 seconds, once this really is complete the operator re-presses line-start within 10 seconds to initiate ramp up. Initially the slitter begins to perform, and the perforating roll and anvil rolls stop, the perforating roll closes automatically and the line then ramps around the speed set on the HMI. When the operator presses line stop on the HMI the line ramps down seriously to an end and the perforating roller automatically opens and then restarts at idle speed. The drives remain enabled until stopped manually by an operator on the HMI. Automatic Start-up The operator triggers the automatic start-up facility utilizing a preset time facility or by pressing a computerized start-up now push-button. This facility inflates the airshafts, starts the drives and then applies heat to the Tokuden rolls in a fixed sequence ensuring that each stage is complete before another commences. Shutdown The operator can make the shutdown facility. It stops the hydraulic pack and causes the Tokuden rolls to cool. When the anvil roll reaches 60 degrees C the line drives and the Anvil roll drive are stopped. When the perforator roll reaches 60 degrees C the perforator roll is stopped and the contactors supplying capacity to the Tokuden panels de-energised.
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