Are you familiar with our top product—the Flex-Spring hinge for flip-top closures? Developed and patented by Silac, this hinge stands out thanks to its exceptional load-bearing capacity even at the widest opening angle. And it’s guaranteed not to break. See for yourself the many benefits of Flex-Spring closures!

Plastic closures have become an indispensable part of everyday life

Plastic closures are found everywhere in our daily lives—on our beverage bottles, our morning face cream, or our favorite salad dressing. There are different types of closures: screw-on, clip-on, or flip-top closures, stoppers, or caps—to name just a few. They all have one thing in common: they’re designed to seal openings and keep dirt and moisture out.
Flip-top lids also have the significant advantage that the lid and the container remain inseparable. This is handy when you only have one hand free or need to act quickly. Today, there are flip-top lids with smart pour-and-dispense lids that make pouring any kind of liquid easier. User-friendly and clean.

 

Silac-Flex-Spring hinges last forever

Products that are used every day should also last a long time—or so you’d think. Unfortunately, there are many hinges where this isn’t the case. Repeated opening or even just a slight sideways twist by hand can quickly cause the hinge to break into two pieces. Not so with the robust Flex-Spring hinge from Silac. It won’t break, even at low temperatures. The hinge’s high load-bearing capacity even allows for temporary extension beyond 180 degrees without sustaining damage. That’s a much wider opening angle than comparable hinges from the competition.

Furthermore, the symmetrical arrangement of the hinges—without a disruptive main hinge—ensures optimal material flow during injection molding. As a result, backflow, stress, and cold welds (white marks on colored closures) do not occur.

Advantages of the Silac-Flex-Spring hinge:

• Absolutely stable
• High load capacity
• Maximum Durability
• Maximum opening angle of just under 180 degrees
• Excellent snap effect despite the maximum opening angle
• No white break
• Fully integrated hinge in the closure

  

All of these features make the Medela box ideal for storing and transporting ^Contact™ nipple shields. Thanks to its maximum opening angle, the breastfeeding aids can be easily stowed away. The box can even be opened with one hand and easily closed with a secure snap. Absolutely practical and sturdy. No wonder Silac has been producing this yellow, sturdy box for many years—without any design changes—under the strictest hygiene standards.

Silicone membrane: Leak-proof, heat-resistant, odorless. Ensures an optimal drinking experience and is also easy to clean.

 

Flex-Spring meets every design need

Another key advantage of the Silac hinge is its design. The hinge is fully integrated into the clasp and therefore does not protrude. This gives our customers a high degree of freedom in their design choices, in addition to the wide range of plastic colors available, which leaves nothing to be desired.

The closure developed by Silac, featuring dual tamper-evident protection, is very popular with our customers in the food industry. The lid, with its smart pouring and dispensing cap, is ideal for salad dressings. The Flex-Spring hinge’s high level of user-friendliness makes it a standout in daily use. The closure can be opened with one hand and doesn’t spill a single drop. Gone are the days of sticky hands or dirty bottles.

 

In-House Toolmaking

The patented Flex-Spring hinge closure is also very popular with our customers in the cosmetics industry. RAUSCH viewed the fact that Silac operates its own tooling department as an additional advantage. Based on the customer’s specific requirements, our employees created the necessary tools for the flip-top closures. Using state-of-the-art simulation software, the prototype was then checked for any design flaws. This allowed us to test and analyze various versions until we jointly found the perfect solution.

 

Specialist in sophisticated plastic closures

Silac not only offers over 80 years of expertise in the plastics and closure industry, but also operates its own tooling facility in Euthal. Here, the company manufactures robust, high-quality molds that enable large production volumes for sophisticated packaging solutions.

Silac Flex-Spring hinges aren’t just sturdy, durable, and stylish—they can also be produced in large quantities and customized to your liking. What are your design preferences? Talk to your fastener specialist about your needs.

-> More information: Flex-Spring Hinge Product Sheet