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Trimming of Laminated Glass by Abrasion

IP.com Disclosure Number: IPCOM000019696D
Publication Date: 2003-Sep-25

Publishing Venue

The IP.com Prior Art Database

Abstract

Abrasion removes the excess PVB and generates friction and heat, allowing the remaining film to shrink between the glass layers uniformly, even along contours and corners. This results in a desirable dull finish to the surface of the laminate edge Nonwoven abrasives are well suited for this abrasive trimming operation. The open web construction of a non woven abrasive in belt or wheel form, provides the abrading effect without undercutting the glass. However, other types of abrasive article constructions may also be useful. The abrasive trimming operation can be semi-automatic with operators handling the laminate against the abrasive tool, or fully automatic with the use of robots for a significant positive impact on the line productivity. The abrading tools must be flexible enough to be able to bend around the laminated glass edge shape. For example an abrasive belt can be run perpendicular to the major surfaces of the laminate with sufficient slack so as to conform to the edge contour, or alternatively, an abrasive belt can be mounted on a backstand or a bench motor with a flexible contact wheel (e.g., a rubber wheel or a flexible bristle brush) or an inflatable wheel to allow the abrasive belt to conform to the edge contour. With a flexible contact wheel or inflatable wheel, the direction of operation can be either perpendicular or parallel to the plane of the major surfaces of the laminate. In operation, the operator (or the robot) brings the laminate to the machine running the abrasive tool. Any angle v. the edge of the laminate can be given to the axis of rotation and the tool can even oscillate along the laminate edge. If the inherent flexibility of the non-woven abrasive wheel or the contact wheel is insufficient to control the pressure of the abrading tool on the laminate, a dynamic force control device can be used and connected either to the contact wheel or to the complete grinding machine. Alternatively, the operator or the robot using a portable tool and bring it to the laminate. The force control device is then mounted directly on the robot arm. Another method of abrasive trimming of the laminate employs two or more abrasive wheels deployed such that the edge of the laminate contacts both wheels simultaneously or in series, as shown below. laminate laminate Another alternative is to combine a belt and a belt and a spring-loaded contact wheel, as shown below. The spring may be replaced with a dynamic force control device. C A B D