technology | Hot runners Right:
VarioShot is the latest hot
runner nozzle line from Hasco
pins means the application of FLEXflow technology can also lead to a reduction in clamping force as well as material savings through eliminating the need to over-pack the cavity. In automotive applications, this can be particularly beneficial in production of large- area exterior and interior parts such as bumpers, spoilers, instrument and door panels, roof frames and also lighting and glazing parts such as headlamp lenses and roof panoramic panels.
Thermal optimisation Other recent HRSflow developments include the ECOflow thermal management system, which is claimed to reduce energy consumption by around 20% compared with conventionally designed hot runner manifold systems, and an expansion of the Multitech (MTR) hot runner nozzle line for multi-cavity moulds. Aimed at applications in the medical, electrical and
Below: HRSflow’s MTR nozzle family includes designs for thin-wall injection
moulding and production of thick-walled parts
electronics, and automotive industries, the expanded MTR hot runner nozzle is available in three specifica- tions: MTR-T, MTR-M and MTR-S. The MTR-T nozzle is specifically designed for the injection moulding of large containers with wall thicknesses from 0.45mm and a flow length to wall thickness ratio of up to 350. Injection pressures up to 2,200 bar and melt throughputs up to 180 g/s can be attained. The company says this hot runner nozzle is suitable for decorative injection moulding using the IML process (In-mold labeling). MTR-M nozzle offers advantages in the injection moulding of polyesters to produce thick-walled parts with a high-gloss finish. When used for cosmetic packaging, household articles or in medical technology, wall thicknesses of 20mm and more can be produced. The MTR-S type has also been developed for thick- walled parts up to 20mm, but is geared specifically to the injection moulding of DuPont’s Surlyn, crystal-clear ionomer resin.
Husky Injection Molding Systems recently expanded its hot runner line with the launch of the Ultra Helix 350 valve gate, which it says offers near zero gate vestige and virtually eliminates mechanical wear on valve stems and cavity steel. “The gate quality of the Ultra Helix nozzles continues to impress many of our custom-
ers,” says Stefano Mirti, Husky President of Hot Runners and Controllers. “The addition of the 350 valve gate demonstrates our commitment to bring industry- leading performance to an even wider audience.” The Ultra Helix design provides a very high level of
stem to gate concentricity, which reduces wear, while a new heater design is said to provide a highly consistent thermal profile. According to Husky, the consistency and performance of the nozzles decouples short shot balance from nozzle heater performance, eliminating the need for balance changes when replacing a heater. Hasco has also been working on its hot runner line-up, with the addition at K2016 of the Vario Shot nozzle series, designed to provide a compact mount, optimised temperature control, and ease of servicing in a modular design. Vario Shot nozzles can accommodate depths of up to 300mm and can be used to process engineering and reinforced plastics with shot weights up to 2,000g. The nozzle is designed so that heaters and thermocouples can be replaced without removing the nozzle tip. Other features include durable wear resistant alloy torpedo tips with flow-optimised geometry. The company has also introduced a new simple hot
runner controller for one or two zone applications. The H1250 offers self-optimising control and soft start functions while LED displays present setpoint and actual temperatures, control parameters and error messages, and alarm diagnosis. Additional features include boost and standby function and automatic monitoring of the sensor and heating.
Click on the links for more information: ❙
www.thermoplay.it ❙
www.priamus.com ❙
www.synventive.com ❙
www.maenner-group.com ❙
www.BGInc.com (Barnes Group) ❙
www.milacron.com (Mold-Masters) ❙
www.ewikon.com ❙
www.hrsflow.com ❙
www.husky.co ❙
www.hasco.com
46 INJECTION WORLD | November/December 2016
www.injectionworld.com
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