CORE-BOND / Reflow Core
As a wound string is tuned to key, the core wire stretches and thins slightly, while the wrap wire does not. For this reason, most string manufacturers spin the wrap around the core under core tensions similar to pitch.
ASSEMBLY BONDING AND THE BLACK DIAMOND #BD6900 WINDING MACHINE
BD6900 CUSTOM MACHINES
We start out with U.S.A. high-grade metal alloy. The assembly of the string begins with the application of core wire placement and pulled to a specific tension. The outer winding material is then applied by Black Diamonds most advanced string winders in the industry. Named the BD6900, these winders are one-off specialized made machines built by Black Diamond. The BD6900 assists Black Diamond production operators to produce with precision, a Core-Bond ™️ string every 20 seconds resulting in an unparalleled and consistent product.
The BD6900 winder's computer-controlled technology allows production operators to input and monitor pull tension, speed, braking, and pitch angle to name a few of the variables available to the operator. The objective is to achieve our proprietary calculations for core-to-wrap coupling. This completes the first phase of a Core-Bond ™️ strings.
Phase-two is the most important process. The Core-Bond ™️ activation phase is to submerge the string in our proprietary treatment bath that activates the inner bonding and "bonds" the core to the wrap wire. The result is longer life, lasting tone, more strength, projection, and output. These are the highest attributes that most guitar players are looking for in a great string.
WE HAVE CHANGED THE GAME FROM THE INSIDE OUT
COATED VS. NON COATED Core-Bond ™️ TESTING IN OCEAN WATER
We took a very extreme approach to our testing. By submerging Core-Bond ™️ treated strings in a 5% Saline bath to replicate ocean water, the image below shows results after 96 hours. Keeping in mind, Core-Bond ™️ strings DO NOT have an outer coating to protect the strings. The result is amazing.
Now, we realize a player is not going to put their string in ocean water, but this does validate the protection characteristics of Core-Bond ™️The strings were clipped at each end to show the acceleration of corrosion at the ends of the exposed steel plated core wire. Notice seepage of corroded core coming through the center of the coated string on the right, compared to the non outer coated Core-Bond ™️ treated string left .
STANDARD HEX CORE vs HEX CORE with Core-Bond ™️
Plated Hex core seen below, is a widely used core wire and one of the best wires to use when trying to achieve the perfect wrap to core bond. However, wrap slippage when tuning /de-tuning along with the degradation of the core through galvanic corrosion caused by the acidic content and dirt in your hands will attribute to sooner than later tone loss.
Above - Natural core without Core-Bond ™️
Magnification image below shows a Black Diamond's high carbon steel core and the valleys Core-Bond ™️ create. Our secondary Upflow process reflows and upFlows to locks in the wrap wire.
With the wrap wire disassembled from the core, the valleys remain. The core wire is surrounded and protected by Core-Bond ™️ . The Tips of the valleys you see show how Core-Bond ™️ , our Secondary Stage Upflow Submersion process allows the Core-Bond ™️ to up-flow into the wrap wire spaces and secures the wrap to core bonding we need to achieve.
Above - Black Diamond's high carbon steel core and the valleys Core-Bond ™️ creates
Below - Competitors less than robust attempt at core to wrap bonding.
Black Diamond Strings with Core-Bond ™️ FACTORY WARRANTY United States
Strings are subjective, we understand that players have their own view of when a string has lost its tone. At Black Diamond Strings, we are so confident in Core-Bond ™️ technology, we offer free replacements within 60 days of purchase for any string you feel tone loss is experienced. Just present us with a proof of purchase. (At this time, replacements are available to USA customers only)
PATENT - US9424819B1 - Corrosion-resistant wound musical string. Abstract - The method improves the core wire-to-wrap wire bond by using a bond coating between the core and wrap wires that preferably also minimizes the galvanic activity between them. The bondable coating is applied to the core or wrap wires, or both. In one embodiment the method entails creating a coated core wire by annealing bare core wire, bathing the bare core wire in a bondable coating material and removing any excess, drying the bondable coating, making the string using the bondable-coated core wire, and reflowing the bondable coating. In another embodiment the method entails additionally coating the wrap wire with a coating that does not reflow under the same conditions as the bondable coating on the core wire, and winding the coated wrap wire around the bondable-coated core wire before reflowing the bondable coating.
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