What is the key point of a good glass processing factory?
What is the key point of a good glass factory? The answer is: edging. Edging is the key to check the quality of a glass factory.
Generally, a glass processing factory spends much on cutting machine, tempering furnace, insulated glass production line, such as TAMGLASS, NorthGlass, Jingglass, Tomorrow star, Bystronic, LiSEC, VETROMAC, Bottero, etc.
Cutting is very important. The VETROMAC CNC glass cutting machine has high cutting precision and no large errors in long-term use. With the development of technology, many domestic cutting machines can achieve high precision. When I need a piece of glass, the size is 1400x2000mm, the glass is not cut to 1400x2000mm exactly, but a little larger. It will be edged according to requirements.
Cut and Swipe or Seamed Edges
Also referred to as safety seams or swiped edges, this type of glass edging — in which a sanding belt is used to lightly sand off sharp edges — is primarily employed to ensure the finished piece is safe for handling. This style of edging does not provide a smooth, cosmetically finished edge and is not used for decorative purposes; therefore, this method is ideal for applications in which the edge of the glass piece will not be exposed, such as the glass installed into the frame of fireplace doors.
Grind and Chamfer (Bevel)
This type of edging involves flat grinding glass edges until they are smooth and then running the top and bottom edges along a belt to eliminate sharpness and remove chips. The resulting glass piece features a smooth chamfer top and bottom with an exterior ground edge. Available with straight or curved bevels, chamfered edges are most often seen on frameless mirrors, such as those on medicine cabinets.
Pencil grinding, achieved through the use of a diamond-embedded grinding wheel, is used to create a slightly rounded edge and allows for a frosty, satin, or matte glass finish. ”Pencil” refers to the edge radius, which is similar to a pencil or C shape. This grind is also referred to as a Semi-Polished Edge.
Pencil polished glass edges are ground smooth, finished with a shiny or glossy polish, and feature a slight curve. The unique finish makes pencil polishing ideal for aesthetics-focused applications. Like pencil-ground edges, the edge’s radius is similar to a pencil or C shape.
This method involves cutting the edges of the glass and then flat polishing them, resulting in a sleek appearance and shiny or glossy finish. Most flat-polished applications also employ a small 45° angle chamfer on the top and bottom glass edges to remove sharpness and “chatter” which can also be polished.
How does edging affect tempering?
The key impact of edging on tempering is: different edges, different tempering parameters. Glass with seamed edges needs more heating time than grinding or polishing edges.
Correct adjustment of tempering parameters for different edges makes good flatness and less roller wave distortion for tempered glass. When perfect tempered glass is laminated or insulated, it will get super high quality products.
Edge quality plays an important role both from mechanical point of view and optical point of view.
In the case of inferior edge quality, large flaws render it weak and difficult to sustain tempering stresses without premature fracture. This leads to loss of production efficiency and often results in unacceptable economic penalty for glass manufacturers. High quality edge finish ensures high strength and can sustain high temporary tension during tempering thereby improving temper quality without breakage. Glass breakage during tempering cuts down productivity and at the same time reduces glass quality.