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Silicone Molding Applied to Two-Stage Injection
by Nice Rapid | Apr 07,2021 | Silicone Molding

The notion of creating a mold out of silicone was something unheard of just a few years ago. These days it’s commonplace in the manufacturing industry. It’s one of the best ways to showcase how much the industry has advanced to find solutions to overcome the issues that made manufacturing a process that was not effective, time-consuming, and expensive as hell. Two-stage injection is another breakthrough that was achieved some time ago, and we are going to take a closer look at it to understand better what’s it all about.

Overcoming Limitations

Two-stage injection was devised as a means to overcome the limitation of primary injection for silicone molding. The shot size does not have one size for all fixes. It rates inconsistencies, and most of them become visible in the non-return valve. If you get screw retraction during the silicone injections, it means all the pellets entering the mod are not working as they should. By using a fixed injection screw, you can fix this issue and get your plunger injection unit to work like silk.

You can get the same results with non-reciprocate screws, which is cheaper, and it will help you get the right alignment of the noose with the mold. There are a few technicalities to overcome, but all in all, getting the plunger to do what it’s supposed without creating a mess it’s all you want or need. There are non-conventional solutions to the issue, but they call for more specialized handiwork, such as channeling the silicone using a center-screw.

injection molding of LSR

Overcoming Obstacles with New Silicone Injection Technology

We cannot hit the mark with a standardized solution. Unfortunately, there is no room for that in this industry, given the diversity of needs out there. We can, however, find common ground to work around issues that raise their ugly head in all projects, such as the use of injection-ex units. This tech makes the work handled using either hydraulics or electric machines way more manageable. Using servo-driven screws, plug directs lines and move the injection unit to get better results.

You can also solve any inconsistencies related to shot volumes that appear with the closure of check valves as the injection begins for every new cycle. The valve located in front of the screw on the injection ex-units can solve this easily since it can be calibrated by the operator when the issues arise. The transition will go over the valve and be spring-loaded with washers that will have the machine working perfectly at all moments.

Closing Technicalities

We are dealing with automated technology that will shut down after a screw is turned. The injection can be halted and fixed while you are still working. This was something unheard of just a few years ago. Once you activated the silicone molding process using your injection machines, there was no way to change anything until the device was finished. A quick stop can give you a great advantage and help you solve issues that would cost you money in the long run. Learn the ropes, get familiar with it and beat your competitors by being one step ahead!

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