processing of paper, plastic film, steel and aluminium to mention a few. Hot perforation is just a preferred method for brittle substances such as for example plastic film. Optima has been involved in the design of a perforating machine control system. The machine was made to perforate reels of film laminate employing a combined heat and pressure process. To do this, the film is passed through a nip created between a heated perforating roller and a heated anvil roller. Throughout the perforating process paper can be used to safeguard the film from damage. The perforated film is slit into strips and each strip is then wound onto someone reel.
The Pulsed perforation machine is an unbiased unit which allows the vertical perforation of products. This product could 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. These perforations could be continuous or pulsed, the length and the time of the pulse can simply have adjusted utilizing the measure settings on the touchscreen display panel. Perforated paper is then delivered onto our collector delivery output unit.
The machine is mobile on wheels making 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 by way of a separate stand-alone system. The operator starts these rolls manually and they operate at a fixed idle speed. The rolls remain open before 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 situated on the paper unwind, film unwind and paper rewind are utilized below 5% line-speed to preset the respective drives internal diameter calculation blocks. The product rewinds use the diameter sensor situated on the product rewind A to compensate for diameter build up. Load-cells situated following the paper unwind, following the film unwind, prior to the paper rewind and following the S-wrap are accustomed 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 accomplish the respective tension setpoints. Perforation Machines In addition once the perforating nip is closed and the paper unwind and S-wrap drives are started they act to control tension to the respective setpoints.
To set up the device the operator runs the film and paper unwinds and the paper rewind at fixed slow speeds using jog pushbuttons located close to 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 begin and the line to perform at a preset jog speed with the nip open.
Once the device is threaded and the operator has checked that the anvil and perforating rolls have reached an appropriate temperature, the operator starts each of the drives from the HMI. When they’re started the film unwind, paper rewind and product rewind drives act to tension the web 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 that 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 as much as 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 employing 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 and every stage is complete before another commences.
Shutdown
The operator can select 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 power to the Tokuden panels de-energised.
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