What the Goldenrod 1260 can do for you...
Goldenrod's European counterpart Svecom invented the Multiple External Bladder design over twenty years ago, and Goldenrod soon introduced it to North America. Prior to this time, people had been using either non-expanding mandrels with locking collars or single internal bladder shafts.
The single internal bladder design is still the primary offering of some current shaft manufacturers. This design has all the expanding components tucked away within the ID of a metal tube. When inflated, the lug, button, leaf, or pad expanders protrude through slots or holes in the shaft body to grip your core. These expanders can damage or get lodged in the core ID, making retraction difficult for your operators. Core shavings and dust can fall into the shaft through the open slots, preventing the gripping apparatus from expanding. Maintenance on single internal bladder shafts takes anywhere from several hours to several days. Before the advent of the Multiple Bladder Shaft, the limits of some machines were in part defined by the limits of these shaft designs.
Compare our Multiple Bladder shaft to competitive single internal bladder shafts, and you can immediately see the difference. Even if you've never used a pneumatic winding shaft before, you'll quickly understand why the Multiple Bladder needed to be invented. To this day, it is still the #1 major advancement in shaft design.
* All the expanding components are in multiple equally spaced rows on the outer diameter of the shaft. Maintenance is quick and easy, simply remove two crimping lugs and slide out the rubber ledge to replace the bladder. The entire process takes less than 10 minutes. (See COST of REPAIR comparison)
* The multiple gripping expanders (ledges) extend the length of the body. Since there are no interruptions, you can run a single roll or multiple narrow rolls and place them anywhere on the shaft. You can't do that with the lug design. (See DIFFERENTIAL SHAFTS for multiple core winding)
* All the expanders are on the outside and nothing is rattling around inside, so the shaft is easier to balance. Higher running speeds can be achieved, especially when our CENTERING feature is used.
* There is no need to ever remove a journal from the body to replace an expanding component. The process of removing and re-installing a journal into a single internal bladder body may weaken the shaft and compromise the straightness and balance characteristics.
* There are many more rows of gripping expanders than competitive lug or button shafts. For example, we can use up to six rows on a 3" shaft or up to 12 rows on a 6" shaft. Combine this with our INTERNAL VALVE feature to handle your highest torque requirements.
* Our ledges are made of fully molded rubber with a steel backing, which protects the bladders underneath from external sharp objects. They will all expand identical distances to a mechanical stop, and will not damage the core ID. We have optional aggressive steel ledges for your most demanding torque applications.
* The Multiple Bladder design lends itself to LIGHTWEIGHT and ULTRALIGHT aluminum or CARBON FIBER PULTRUSION models. For extremely demanding applications with heavy loads and torque requirements, we can make a shaft completely from one piece of solid steel. These shafts have no journal-to-body connection and are the strongest way to make cantilevered shafts for the METALS industry or SMALL DIAMETER SHAFT for tape and bag machines.
* The Multiple Bladder design is able to expand up to .375", providing plenty of clearance to get in and out of cores. Competitive single internal bladder shafts only expand about .250"; furthermore, their bodies are made oversized to approximate roll centering, making them even more difficult to use.
* We use two different size expanding components on nearly all our Multiple Bladder models, so spare parts are common to most all our shafts, regardless of size. (SPARE PARTS)