DUSSELDORF, GERMANY - K'95 was a showcase for molds and hot-runner systems for injection molding, as well as extrusion dies. Primary machinery manufacturers featured tooling innovations on their equipment. The following reports on what some specialist mold and die suppliers introduced in Dusseldorf:
Mold-Masters Ltd. showed:
A horizontal hot-tip nozzle designed for direct edge gating of small, thin parts such as pipettes and pen barrels. Mold-Masters' engineers wanted to solve problems with direct gating of long, thin parts with very small cross sections. The nozzle has two, four or eight gates.
By extending the tips away from the center axis of the nozzle, the company said cavity strength is maintained, more cooling is possible and the hot runner does not complicate details of the mold cores and cavities.
Another new nozzle for direct gating of very small parts, the Dura Femto-Shot is the smallest 220-volt nozzle that is both directly heated and has an open pipeline design, the company claimed. Nozzles may be spaced as close as 0.8 inches apart, while maintaining a fully balanced manifold system.
A Hot Tip Torpedo, designed for the company's Dura line of hot-runner systems.
The torpedo is made using the metal injection molding process from tungsten carbide, which is harder and more conductive than copper alloy-based tips. Mold-Masters said the torpedo gives better gate control, faster cycles, clean gates marks and longer life.
Two new single-nozzle gate systems, the Dura Centi-Shot Rack & Lever for parts weighing up to 1.75 ounces and the Dura Hecto-Shot Rack & Lever for parts up to about 5.5 pounds. The rack and lever is a patented pneumatic actuator featuring a geared assembly that produced a vertical force on the pin, with no horizontal forces that can cause wear to the valve pin and bushing.
A flow analysis system called Flow Molded Design Plus, expected to be available by the end of 1995.
Mold-Masters is based in Georgetown, Ontario.
Axxicon Group NV, a Dutch mold maker that will open a U.S. customer and technical support office next year, introduced a mold specifically designed for the newest generation of compact disc injection presses, with a CD molding cycle of less than four seconds.
The new single-cavity mold also can be fitted on machines already installed. The mold has a diameter of 9.4 inches and weighs about 125 pounds. It offers a choice of all-vacuum or mechanical stamper holding, with a changeover in less than 30 seconds.
One of the units, named the CI-Mould, was running at K'95 at 's booth on a new Netstal Discjet 600 CD production unit.
Axxicon also showed a smart card manufacturing system, with a hot-runner, four-cavity mold and in-mold labeling.
Axxicon Group is based in Helmond, the Netherlands.
Wilden GmbH & Co. KG displayed injection molds for prototyping made by laser beam sintering of metal powder, now under development.
Using the technology, Wilden said, a mold insert could be made directly from a computer design, then inserted in a master tool.
Wilden is based in Nabburg, Germany
In blown film extrusion, Brampton Engineering Inc., revealed its streamlined coextrusion dies (SCD) after keeping the proprietary design a secret for years.
Benefits of SCD dies include superior streamlining of the melt flow, isolation of temperatures and a simple design so the die can be modified by adding more layers.
Brampton Engineering is based in Brampton, Ontario.
Extrusion Dies Inc. of Chippewa Falls, Wis., showed its new Autobar restrictor bar for flat dies to make uniform, low-stress sheet and film.
Autobar uses computer-controlled, thermally actuated restrictor-bar bolts that adjust the distribution of the polymer through the die manifold. The device controls thickness and maintains uniform, parallel die-lip gaps, the company said.
James E. Johnson, vice president of sales and marketing, said Autobar eliminates the need for adjustments of downstream die lips.
Using Autobar along with EDI's Autoflex system, processors can greatly expand the range of resins extruded with precise dimensions on the same die, he said.