How Are Stainless Steel Cups Made?

A high-quality stainless steel cup is more than just a container; it’s a marvel of modern engineering, a testament to durability, and a commitment to a sustainable lifestyle. At Jarrino, we don’t just manufacture cups; we craft them with precision, passion, and an unwavering commitment to excellence. But have you ever wondered about the journey a raw sheet of steel takes to become your favorite Jarrino go-to cup? Let’s pull back the curtain on our manufacturing process.

Step 1: Selecting the Superior Material
It all begins with the right material. At Jarrino, we exclusively use 18/8 (304) Grade Stainless Steel. This means the alloy contains 18% chromium and 8% nickel, making it highly resistant to rust and corrosion. This food-grade, premium material is the foundation of every Jarrino cup, ensuring it never imparts a metallic taste and keeps your beverages pure and fresh.

Step 2: Precision Stamping and Drawing
Large, coiled sheets of this stainless steel are fed into powerful hydraulic presses. A deep drawing process stamps and forms the flat sheets into the familiar cylindrical shape of a cup. This isn’t a single action but a gradual process, often done through multiple dies. This “deep draw” technique ensures the walls of your Jarrino cup are formed from a single piece of metal, eliminating weak seams at the sides and providing superior structural integrity.

Step 3: Trimming and Smoothing
After the initial drawing, the cup’s edges are rough and uneven. They are precisely trimmed to achieve a uniform height and a perfectly level rim. We then meticulously polish and buff the entire body to a smooth, flawless finish, preparing it for the next critical stage.

Step 4: The Magic of Insulation
This is where the science of temperature control comes to life. To create our signature double-wall vacuum insulation, we craft an inner wall and an outer wall. These two walls are strategically fused together at the rim, leaving a precise gap between them.

The cup then undergoes a critical process where the air between these walls is completely removed, creating a vacuum. This vacuum chamber is the key—it prevents heat transfer by conduction and convection, meaning your Jarrino cup will keep drinks icy cold for hours or piping hot even longer. It’s the heart of our product’s performance.

Step 5: Laser Welding for a Flawless Finish
Unlike some manufacturers who solder the base, leaving a visible ring, Jarrino employs advanced laser welding technology. This creates an incredibly strong, clean, and invisible seam at the base. This not only enhances the cup’s sleek, minimalist aesthetic but also guarantees no leakage and makes it easier to clean.

Step 6: Polishing to a Mirror Shine
Now, the cup receives its final aesthetic touch. It goes through several stages of polishing with increasingly fine abrasives. This process gives Jarrino cups their distinctive, brilliant mirror finish or a sophisticated, smooth matte texture, depending on the design. We pay exceptional attention to detail to ensure every cup is visually stunning.

Step 7: Rigorous Quality Control and Testing
Before any cup earns the Jarrino name, it must pass our stringent quality control checks. We test for:

Leak-proofness: Every lid is tested under pressure.

Thermal Performance: Samples are filled with hot and cold water and monitored to ensure they meet our strict heat retention standards.

Durability: Cups are tested for impact resistance and structural integrity.

We believe a promise of quality is a promise to be kept.

Step 8: Packaging and Delivery to You
The final step is packaging our crafted cups in elegant, recyclable packaging, ready to find a new home with you. From our factory floor to your hand, each Jarrino cup is a symbol of our dedication to creating products that elevate your daily rituals.

At Jarrino, our process blends cutting-edge technology with meticulous handcrafted care. The result is more than just a stainless steel cup; it’s a reliable, beautiful, and sustainable companion for your adventures, your workday, and your quiet moments at home.

Choose Jarrino. Experience the difference craftsmanship makes.