Kona technology for coinjection molding
Kona Hot Runner Systems has introduced coinjection molding technology that runs through its hot-runner systems, using sequential valve gating designs.
The design has a patent pending and uses a three-position valve actuator that shuts off the gate.
The sequential system allows for core flow out of one nozzle while another nozzle is injecting the skin only. The design lets a molder control the skin/core ratio and the melt front, providing uniform filling.
Gloucester, Mass.-based Kona said the gate area uses spiral flow technology that creates an annular flow (typically the skin) around a central flow (the core).
Kona, a unit of Dynisco Inc. of Sharon, Mass., claims it is the only hot-runner supplier to incorporate an additional shut-off design in the manifold for each nozzle.
The company said coinjection technology is suitable for molding large parts that would benefit from control over the fill pattern.
Tel. (508) 281-3810, fax (508) 281-5882.
Mold-Masters updates flow analysis software
Mold-Masters Ltd., which makes hot-runner systems and mold components, has released version 2.01 of its Fillplus flow analysis software.
Mold-Masters developed Fillplus with software supplier Plastics & Computer International srl of Milan, Italy.
The Windows-based program is designed to quickly analyze mold filling with Mold-Masters' hot-runner systems. It works with any type of mold.
New features include:
The calculation of residence time that determines the number of shots and amount of time to purge the runners and barrel.
The calculation of shear stress in the gate and cavity. It displays the results against maximum limits.
Automatic gate substitution that quickly compares results for different sizes of gates.
An updated database with the latest Mold-Masters specifications.
A Fillplus demonstration disk is available from Mold-Masters. It can be downloaded from the Georgetown, Ontario, company's Web site at http://www.moldmas ters.com.
Tel. (905) 877-0185, fax (905) 873-2818.
Wittmann improves wrist range of robots
Wittmann Robot and Automation Systems Inc. has added a servo-driven A-axis wrist and a C-wrist to its robots.
The compact A wrist can rotate up to 300 degrees. It also provides up to six degrees of coordinated motion control.
The C wrist is servo-driven and allows incremental rotation control of 0.1 degree of rotation. Wittmann said most robots today have a pneumatically driven C-axis.
The company is based in Torrington, Conn.
Tel. (860) 496-9603, fax (860) 482-2069.
Moldflow, Cad.Lab integrate information
Moldflow Corp.'s Part Adviser simulation software will be linked with Cad.Lab Inc.'s Eureka Gold 97, a technology that helps generate models rapidly.
The two companies have signed a technology and marketing partnership agreement to integrate Moldflow's Part Adviser software with Eureka Gold 97.
Lexington, Mass.-based Moldflow introduced Part Adviser at NPE 1997.
Part Adviser is used early in the part-design process to determine if a proposed mold will fill, Moldflow said.
Cad.Lab's Eureka Gold 97 provides modeling shortcuts for designing complex components, such as injection molded plastic parts. Cad.Lab is based in Santa Clara, Calif.
Contact Moldflow at tel. (617) 674-0085, fax (617) 674-0267.
PTI offering faster vision gauging line
Packaging Technologies & Inspection of Tuckahoe, N.Y., is offering a new line of automatic vision gauging systems to measure dimensions of molded precision caps and other parts, to keep mold process parameters under control.
The device creates measurements in less than 1 minute for a multicavity mold.
Packaging Technologies said manually operated optical gauging systems can take up to 2 hours to complete all measurements.
Tel. (914) 337-2005, fax (914) 337-8519.