Bole and Complete Plastics has a very good customer in Georgia that has purchased two EKS injection molding machines for manufacturing their plastic parts. One of the machines is a 350-ton system and the other is 535 tons. Talk about heavy metal!
The features of these injection molding machines include center press platens, which allow a customer to run smaller molds inside each machine without any deflection of the platen while holding the tolerances for the part-shot specification. The shot-to-shot repeatability is much better than machines listed as toggle clamps with engineered platens that defer stress to the center of the platen. When you design a casting to defer stress it means that the stress is forced to the center of the platen by putting pressure elsewhere. Generally this means that most of the force is transferred to the tie bars.
If you hear that a machine has a history of tie-bar breakage, you can look at the design and most of the time you will see an open clamp that has been designed to center press. Again, with this Bole design, it is a true center press platen with a clamp that opens outward so that the clamp cylinder is located inside the clamp for a stronger stroke, and the lamp is shorter to save several feet off of the length of the machine in order to save floor space without going to a two-platen style machine which costs more money.
Speaking of "tie-bars," Bole's moving platen support structure for the 110 - 1102 US-ton presses uses a linear guide rather than tie-bars, for smoother movement and thus greater accuracy. This also serves to keep the mold area clean for clean-room use.
With a center press platen you have a holding force placed where you need it on the edges of the mold. So, if you need a part weight of 5 oz. per part, the force is always the same on the edge of the mold and you will get five ounces every time very repetitively. In most other injection molding machines, if you need 5 ounces your part may weigh up to 5% more because of the force being unevenly distributed across the mold. Once we show that a part needs to be 5 ounces in weight, most customers have no problem with a 5.2-5.5 ounce shot as a tolerance. The stability from shot to shot is observed in their machine and a 5% savings in material usage per year can be expected. When totaled, this is a lot of extra material saved on a yearly basis; it makes no sense to have a clamp that can hold tolerance without an injection unit that can keep up.
Our second benefit in the EKS series is the design of the injection cylinder. Since the design allows the flow of oil to not pass through check valves, the oil flows more evenly through the cylinder to allow a much faster flow with less restriction - for a much more repeatable part consistency. Even though Bole supplies a full line of injection electrical machines, the EKS will be very close in repeatability and very cost-effective price-wise based on the machine-to-machine cost. Also, the even flow will reduce the wear of the oil and make the response of the injection unit much faster and repeatable. With this design, the oil flows more directly from the cylinder and back without all of the check valves and the 90-degree turns that are built inherently into other brands’ designs.
The Bole EKS is a better design than any of the 'me two' products on the market. Not only is the EKS series available at a very competitive price but with the benefits listed above, these injection molding machines will payback in productivity in a very short time frame.
Want to learn more about Bole’s EKS series? We’d love to talk specs and productivity with you. Call us, email us, or use our easy form here to get started with the latest technological innovations in injection molding machinery – from Bole of course!
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