What is a DKDT Glass Grinding Machine, and Why is it Essential?

Glass grinding machine (also known as a glass grinder or deburring machine) is a machine that processes the sharp, micro-cracked edges of glass after cutting, making them smooth, safe, and durable. Although the edge of the cut glass may appear smooth to the naked eye, it contains microscopic notches and cracks; these notches are the starting point of fracture under stress.

Types of break-in and terminology

Let's clarify some commonly confused terms in the industry:

Deburring (seaming / arrissing): Edge sharpening. This is a fundamental process; its purpose is not aesthetics, but safety and fracture resistance. It is a minimum requirement in tempering and insulating glass production lines.

Straight break-in period: The edge is made into a smooth surface. The visible edge of the glass remains matte.

High-gloss polishing: Edge polishing after smooth grinding. This is preferred for applications where the edge remains visible, such as shower enclosures, table glass, and display cases.

Corner and radius: Breaking or rounding off sharp edges reduces the risk of injury during handling.

Why can't the break-in period be skipped before tempering?

During tempering, glass is heated to approximately 620-650 °C and then rapidly cooled. This process creates compressive stress on the surface and tensile stress in the interior — this is what strengthens the glass. However, if there is an untreated microcrack at the edge, this stress represents a new force that will enlarge it. The result: the glass shatters in the furnace or shortly after it leaves the furnace. Every piece of glass entering the tempering furnace must have its edges precisely treated.

In insulating glass production, untreated edges, spacers, and bonding sealants prevent full contact between the glass and the sealant. The result is a loss of sealing and condensation inside the unit in the long term.