HEATING AND PRESSING SECTION

LAMINATED GLASS LINE

• Heating process through special infrared medium wave lamps, with quartz frame and golden reflecting surface on back side.
• First oven length 2 mt, with 6 lamps (3 on top and 3 on bottom); second oven length 4 mt, with 18 lamps (9 lamps on top and 9 on bottom); to increase productivity (+15%), 8 lamps on first oven and 24 on second oven can be mounted (OPTIONAL); high speed heating and pressing version (+50% productivity), first oven length 2 mt with 10 lamps, second oven length 6 mt (3 sections of 2 mt) with 30 lamps.
• Each of two ovens is controlled separately by PLC, with temperature, irradiation control system and glass presence system, to optimise working phases and the saving of energy; specific software for small glass.
• Temperature reachs needed values through PID, with fastest speed and lowest consumptions; the choke system of the power, and switching on/off of the lamps independently (for each pair), enables the processing of special glass types (low-e. glass) for a more flexible production
• Suction system of the ovens with fans, to fall temperature inside ovens, if it's too hot.
• Forced air convection system inside ovens (OPTIONAL), that keeps the same temperature inside the whole volume of the ovens through canalized hot air flow (carry out by closed circuit and two fans one on the top and one on the bottom); this device is very useful to heat PVB film working big thickness (more than 60 mm) and with glass that was treated on one side (Low-E, reflective, painted glass…); air heating through IR (infrared) lamps; hybrid furnaces can work with air convection system or only with infrared heating; this double way to work guarantees energy saving (thanks to the air convection processing) and big flexibility for mixing production (thanks to the fast adjusting speed of the infrared heating when it needs to change production values, processing different kinds of glasses).
• Rolls inside heating section have diameter 113 mm (studied to bear the weight of jumbo sheets) and are covered by "Kevlar" plait with big thickness to avoid speedy wear and tear.
  
• To facilitate maintenance, ovens have the top part that can be lifted by bridge crane and repositioned through specific rails.
• Temperature inside heating section is checked by specific thermocouples, three for first oven, 6 for second (9 if oven has length 6 mt)..
• Temperature glass panel check at the exit of first oven and at the exit of second press, through pyrometer; this is a very useful indirect control, to verify that inserted parameters are correct, according to different glass and PVB sizes and kind.
• Heating section total installed power: from 120 to 200 Kw (according to total number of lamps).
• Press is constituted by rolls, stainless steel made, covered by special rubber; rolls are planned expressly for this working, to avoid the forming of air bubbles between glass panel and PVB film; perfect pressing of any type of glass and any size thanks to the anti-torsion system that applies a uniform pressure on all the length of the presses; it is, therefore, not necessary to position small glass sheets centrally;
• Top rolls of mangles adjust automatically according to ensembled glass panel thickness (checked at the entry of first oven) through motors and screws system; the rotation of top and down rolls is regulated by only one motor that gives the motion at the same time through gearing system; pneumatic cylinders (two for each press) regulate the pressing power; rolls pressing is optimised and gauged separately through PLC.
• Mangles (pressing rolls) with diameter 400 mm, covered rubber with hardness 85 Sh.
• Total pressing power for each mangle: 21.040 N (value at 6 bar).
• Motor of first press drives transport rollers of first oven, motor of second press drives transport rollers of second oven.
• Heating and pressing process is made easy by the presence of several predefined formulas.