What is the Seating Ring (Stiple) at the Bottom of Glass Packaging and What is it Used For?

We all know that glass packaging, which is indispensable on market shelves and in our kitchens, plays a widespread role in storing a variety of industrial products, especially food and beverages. While being aesthetically pleasing, glass packaging also offers significant health benefits. It is also worth mentioning that certain design features of glass packaging are critical for product safety and ease of use. One such feature, which may have caught the attention of many of us, is the seating ring (stiple) located at the bottom of products like jars and bottles. The stiple in glass packaging is a thin, protruding line that wraps around the body of glass bottles or jars. So, what benefits does this stiple at the bottom of the bottle provide to glass products?

1. Structural Durability

The stiple located at the bottom of glass packaging is a design element that generally increases the durability of glass containers. Additionally, the sloped structure at the bottom of the bottles allows the pressure of the liquid inside the packaging to be distributed more evenly, enhancing the glass's resistance to breaking.

2. Reducing Thermal Stress

Thermal stress refers to the tensions that occur inside the glass when it is exposed to temperature changes. One of the significant challenges encountered during the production and use of glass packaging is thermal stress. If a certain area of the glass heats up or cools down faster than other areas, it can lead to cracking or breaking of the glass. The stiple becomes hardened because it is a quickly cooling area, which helps prevent the progression of cracks that could occur from thermal stress.

3. Transport Efficiency

Glass products move on steel belts at the production site. Glass items in motion contact each other and push each other on these steel belts. The stiple breaks contact with the ground, providing resistance to falling and non-slip properties, thus preventing the products from tipping over while moving on the belt.

4. Product Identification

The stiple in glass packaging is also used by manufacturers for product identification purposes. These protrusions provide information such as mold code, filling level, product capacity, or batch number for operators to read, thereby facilitating product tracking and quality control processes.