“The Ex-Cav fit the package better. It involved less work, was less costly, less complicated and it didn’t require more room than we had to work with. With another type of unscrewing system, we would have had to expand the mold considerably larger, causing our customer to buy a new, larger molding machine."  

~ Glen Casetta, CDM Tool & Manufacturing

“Our customer requested a two-cavity unscrewing mold to fit into a specified press size but the part is large enough that there was a concern about fitting the mold, with rack and gears, into that press size. So, knowing the benefits Collapsible Cores offered, we suggested using them for this project and the customer was willing to try them. The part design was altered slightly, but the customer liked the simplification of it and, in the long run, it also resulted in less maintenance issues for them, not to mention a 20% improvement in cycle times versus an unscrewing system. We were able to provide a lower cost tool that runs more efficiently, requiring less maintenance and less downtime. That’s significant.”   

~ Mark Casey, Custom Mold & Design

“The last mold we designed replaced a conventional, rack-driven unscrewing mold and the results were better than expected. The original mold was running just over a minute per cycle, but the new collapsible core mold now runs at about 22 seconds. It could have cycled faster, but that’s as fast as the press could go! We appreciate being able to run the tooling on smaller presses – all of this “adds up to huge savings.”   

~ Doug Bjork, Concepts Engineering

“There was a height issue with this PVC part. Because the DT Core is so much more compact than more traditional unscrewing mechanisms, we were able to place the core inside a CamAction rather than standing it up vertically in the mold. This gave us room to utilize the required 8” diameter C-Core. Plus the DT Core’s combination of stainless steel and plated components offers good corrosion resistance. At first we were apprehensive because of the size of the part. Though the customer had used 1”-2” collapsible cores, this was quite a size difference. But Roehr built the core, the mold went into the press and it never came out. It’s working great.”  

~ Tony Stender, LeVannes, Inc.

“What I like about Roehr Tool is the ease with which I can work with them.  It’s a one-stop shop, which saves us time, and they work quickly to quote jobs and ensure we have the right product to fit our application.  Their prices are competitive, too.  All of our customers seem happy with them as we’ve never had any problems arise.”  

~ John Bales, Mantz Automation

“This steering column seal housing part is a fairly standard product for us and we have six other molds running similar applications – all using C-cores. There are not enough other options, functionally speaking, that can mold this part. C-cores are the best option for minimizing the substantial undercut and allowing the molds to run automatic. Otherwise we would have to run the part manually and with a deeper undercut. We doubled the speed of production by designing in the collapsible cores and other features. It’s the smoothest running tool we have with C-cores. It’s not a huge producer but we have millions of parts from the other, older C-Core tools that have been running for up to ten years.” 

~ Matt Quinn, BRC Rubber Group

“The Riser Cap is a very durable part molded using a long, 60% LGF Polymer.  It’s an abrasive material, but the c-core itself has shown extremely low levels of wear even after 10 years of production.  We’ve replaced other mold components due to wear but not this, and actually we just wanted the new c-core so that we could have the older one as a backup.  Also, the c-core helped eliminate a secondary machining operation that would have been necessary had we used unscrewing instead.  This part has both an inside diameter thread and an undercut at the bottom of the thread where a seal gets inserted.  What’s kind of unique with this part is that we’re also molding an external thread using an Ex-Cav, and this was a first for Roehr in terms of both the size of the c-core (6+" diameter x 2 1/2" high) and creating both inside and outside diameter threads on one part.”   

~ Bruce Silver, Prototype & Plastic Mold Co.

“We had never used the DT Cores before.  We would have built traditional hydraulic unscrewing molds but instead we chose the DT Core design based on its promise of reliability, clean process, and reduced cycle time.  Also with its shorter length design, this core fits within the parameters of our present molding machines.  The first shot came out perfect.  Not only did the DT Cores offer the space-saving benefit, which was huge for us, but the fact that we can cool the cores is a big factor because in the long run we can save money, especially with the heat and materials we are using for plastic.  The cycle time benefit is just phenomenal – I don’t know how else to express that.  And no scrap – our first shot comes out perfect, with no scrap.  Our mold techs are happy, too, because we are estimating reducing maintenance times by 90% based on what we’ve seen so far.”

~ Mike Roknich, C3 Controls