The cold end spray is required to provide a surface coating to the glass bottle in order to increase scratch resistance during handling and filling. The unit is installed across the open end of the lehr in the area of temperature range between 80 to 120°C (according to coating material specification).
The unit itself is made from a combination of stainless steel and aluminum, to prevent particles coming off. Any part above the bottles is shielded off for additional protection. In order to meet the correct coating temperature area the cold end spray may be repositioned on a rail system, within a length of 2,25m.
The motion across the belt width is executed by the maintenance free, inverter controlled linear drive with toothed belt. The drive motor/gear assembly will be installed on the operational side, next to the control panel itself.
The easy to adjust compensation of the lehr belt movement is ones for each production manually set according to belt speed. Setting information is provided by the PLC and its touch panel.
The spray nozzle (head) is equipped with a pneumatic lifting device in order to coat the bottles normally below the bottle finish only. It will be automatically raised in case of misaligned bottles in a row.
The spraying nozzle may be stopped at the far side for service and adjustment by simply pressing a selector switch. The fine spraying is executed while traversing to the far side and return empty.
In addition a flow sensor is installed to monitor the flow of coating material and ensure a good quality coating.
The required pneumatic components, including the maintenance unit, are attached to the side of the control panel.
All mechanical and electrical parts and components are installed directly on the coating unit and tested prior to shipment. No wiring or piping required for installation other than main supply of power, compressed air and coating material.
The PLC based control allows operating and monitoring the cold end spray. The settings and status visualization is done by use of an operator panel at the control cabinet. In addition unit will have an optical alarm system.
- Electrical drive systems by inverter and toothed belt
- Speed setting for the lateral movement
- Stroke length setting
- Selector switch for permanent or light sensor operation
- Stop switch spray nozzle for service and adjustment
- protected light sensor system
- Flow sensor
- Error messaging
- rail for cold end spray positioning