The laminating of glass has become increasingly popular in recent years as specifiers and architects prefer the safety properties of the product to single toughened glass. Laminated toughened is now the product of choice in commercial building projects around the UK and beyond. There are two types of laminating – Ethylene Vinyl Acetate (EVA) film and Polyvinyl Butyral (PVB) film. Both are two different polymer materials that can be used for glass laminated structures.
The PVB has been the reference material for the glass lamination on building construction and transportation industries for many years. EVA is challenging currently PVB as a lamination material because of some advantageous properties. In fact is a good material also for such type of applications, and is able to fulfil all the key properties that are required to PVB today. Not just that, it is also able to overcome some of the drawbacks of the PVB, outperforming PVB. Due to the lower adhesive properties of PVB, the film needs to be processed in autoclaves, where the pressure applied to the lamination structures helps to improve the limited properties of PVB. This process requires larger production lines and higher volumes of glass to be produced. EVA on the other hand, can be produced is small quantities in smaller workshops and requires a far lower initial investment in machinery.
The Glass Machinery Company offer solutions for both systems. Bovone & Maroso for PVB lines and MicroGlass for EVA.
Bovone Laminating Lines
Bovone have been manufacturing high quality glass processing machinery since 1954 and have a reputation for excellence. Bovone’s World Class Laminating Lines are available in modules for custom design to meet any application. These high production lines are available in effective working widths of 1250mm up to 3300mm. In the UK and Ireland, Bovone are the laminating lines market leaders choose.
Microglass Laminating Ovens
Lamination ovens from Microglass for EVA films are available with either standard heating elements or patented “Microred” technology that reduces the electrical consumption of the lamination oven. The compact design of the oven takes up very little floor space and with the added option of 2 EVA roll holders and the top of the oven, it then becomes a production area to prepare pieces for the next run. Cycle times are dependent on the product but an average would be around 1hr 30min per cycle. The Microglass glass laminating ovens are available in sizes from 1800mm x 1000mm up to 2500mm x 4200mm with operating temperatures typically around 130 degrees. The two popular models are the FLY and the JET. The Fly heating is by means tubular IR heaters with hot air recirculation. The Jet has the same hot air recirculation, but the IR heating is by means of a heating matrix for faster and more economical laminating.
All Maroso autoclaves are designed and built in compliance with the customers’ needs. The aim is to supply a machine, that is able to satisfy each need of the final user since the littlest details. This is the commitment that MAROSO takes on, using the most cutting-edge method of calculation and adequate materials, specialised in different sectors as Composites and derived, Glass, Methacrylate, Marble, Rubber and Food Sector.
Maroso autoclaves are pressure chambers built to grant the optimisation of the different processes of polymerisation through the constant control of the parameters of temperature, heating, and vacuum during the entire productive cycle, in conditions of absolute security and respect of the operational conditions.
Maroso is able to produce autoclaves of different dimensions, in compliance of the customer requests. In particular, our productive range foreseen the production of autoclave bodies with useful diameter from 500mm up to 4200mm and beyond; the length instead can exceed the 15000mm. the pressure and the thermal gradients are in compliance with the customer’s requests.
Assembling rooms for glass and composites
For the glass sector, to complete the laminating Line, Maroso S.R.L. can manufacture rooms able to process Inter-layer PVB as interleaved type (temperature of 18/20 °C) and refrigerated type (5/8 °C). The production is carried out in a space constantly controlled in positive conditions to avoid the presence of dust inside it and to grant the percentage of humidity requested by the PVB, for its better laying and flexibility.
Also for the composites materials sector, Maroso is able to build Clean Rooms (climatic rooms) where the clients carries out the preparation phases of the piece to be polymerised before the cure cycle in the autoclave.
Putsch Meniconi SVP 1080
A vertical panel saw, for the cutting of laminated glass with high thickness glass, armoured glass and anti-fire glass, that offers the possibility to make VERTICAL and HORIZONTAL cuttings with the rotation of the disc carrying head.
In this way is possible to cut a glass sheet without manipulating or moving the glass. The steel frame secured on welded steel pedestals. On the frame the machine is equipped with upper and lower rails so that the beam can slide. The carriage and or cutting unit moves with two rails. One is on the top and one at the bottom of the machine. A supporting back plane is made of water resistant materials, equipped with a series of fixed and movable elements that allow for better levelling of the glass sheet. The sawing assembly complete with the vertical sliding carriage and the diamond disc housing head. On this assembly are located the main motor and additional sliding and locking elements. This allows the sawing assembly to move up and down the panel and also lock into a desired position. A beam sliding along the entire length of the machine. The sawing assembly slides on the rails provided on the beam itself. The operating board is bolted on the arm where all controls of the machine are assembled. A series of wheel blocks and adjustable supports for moving and supporting the glass sheet. An angled setting of the diamond disc housing head is provided in order to obtain vertical angled cuts. Angles are in the range of 10° up to 45°, in steps of 5°, including 22°30′, for a maximum thickness of 45 mm. A pneumatic device for inserting shims which are needed while operating horizontal cuts is provided on the diamond disc housing. This device is operated by a push bottom devise located on the operating board. Shims are inserted at any horizontal cutting height while operator standing on the ground. The ability to regulate the working speed of either horizontal or vertical cutting operations is continuously controlled by a potentiometer located on the operation board and within operating safety parameters. On the same operation board is located a PLC allowing cutting programs for both horizontal and vertical dimensions. This unique design allows the cutting speed to be regulated by the potentiometer and also interact with the inverter. On the same operation board we have included a touch panel as interface with the PLC located inside the main electrical box managing vertical and horizontal cuts.