Safety Glass Experts: how to improve lamination process performance

2012-08-20 | Autoglass

Lamination defects typically represent no more than 1-2 per cent waste from the production of laminated windshields. These figures are not particularly high, but the total cost of waste created by lamination defects internally and externally is such that lamination requires special attention in process development work. The complex nature of lamination processes and lamination defects requires process parameters to be individually adjusted according to the raw materials used, product design and processing equipment.

Vacuum ring installation testing with a client
With SGE I have been have been lucky to work and study on topics involving lamination using different transparent interlayers in addition to regular PVB products. We have learned a lot about Thermoplastic Polyurethane (TPU) and Ethylene Vinyl Acetate (EVA) in Bullet Resistant Glass applications, and also worked with sound insulating PVB interlayers applied to windshields. In this reference I have found that it is easy to overlook the conditions that contribute in reduced lamination process performance. The lamination process has a key role in laminated glass production line performance, and its results and quality are directly linked with bending and pre-processing activities. To understand why lamination waste is so expensive I will review two typical lamination defects and thereafter describe how to improve lamination process performance by introducing the key parameters to be observed.

The lamination process
Dominating the lamination process for the production of windshields contains the following process cycle:
1. PVB preparation-> 2. PVB Assembly -> 3. Vacuum conveyor (cold and hot)-> 4. Autoclave
There are also existing alternatives such as vacuum boxes, but the processing principles remain. The entire process seems simple, however, following the basic guidelines of clean environment work and common processing parameters alone is not enough to maintain and improve defect rates. Without perfectly controlled processing parameters, the process can result in a high number of...




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Article taken from Glass-Technology International bi-monthly magazine (6 issues per year)
Year: 2012 number: 4
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