Laminated Glass Equipment

D8001 CNC PVB Shape Cutter

The machine has been designed to cut shapes in a stack of precut PVB sheets. It has been designed to eliminate the need for trimming of the excess PVB which is typically required when assembling windshields with square or stretcher-cut blanks. This typically requires 2 men, for each shift of production. The machine is able to cut the vinyl to a tight tolerance, wherein trimming after assembly is not required. A small amount of excess (1-2mm), depending on the customer, is usually allowed for operator assembly positioning accuracy variation. Nominally speaking the machine will cut enough parts in one shift, for an entire 24 hours worth of assembly production, resulting in a possible savings of 6 trimmers, less one man to operate the PVB cutting machine.

In the past, die cut machines have been used to limited success. The drawbacks of the die cut machines are obvious: lack of flexibility, die costs (initial, repair, and storage), yield loss due to die wear, safety hazard, etc. With the CNC machine proposed here ultimate flexibility is provided. Depending on how production is scheduled, the shape of the vinyl can be adjusted as required to compensate for additional PVB snapback on stretched vinyl, for bend depth variations, etc. As the customer gets more adept at running the process, vinyl savings can be realized by reducing the amount of scrap.

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PVB Unwinding Stand

The PBV unwinding stand includes accommodations for mounting of two PVB rolls. Special air chucks are provided to hold the rolls, as well as split bearings for easy removal, and air brakes.


PVB Accumulator, with Pinch Roll Drive and Splicing Table

The PVB Accumulator is configured for the maximum roll width. A pinch roll drive system controls the feeding speed into the accumulator and pinches the vinyl during splicing. While splicing, the accumulator allows continuous flow of the PVB within the accumulator to the downstream process. When splicing is complete, the pinch roll drive controls the flow into the accumulator once more to bring the level of vinyl storage within the accumulator to full.


PVB Compensator System (with optional Conditioning Room)

Built in a similar way to the PVB Accumulator, the PVB compensator includes low friction bearings and other applicable differences required for the compensation room environment. The PVB compensator provides moving 'storage' time for the vinyl within a temperature and humidity controlled room to ensure that the vinyl is at optimum condition. Depending on the qualities of the vinyl supplied, the compensation system may provide for significant vinyl savings.