Page 64 - Plastics News November 2018

produCt news

HRS ‘Compact technology for low- Boy releases its largest press at

height hotrunner stackmolds Fakuma

RSflow has added to its product range a special low- r. Boy & Co. GmbH, the specialist in small-tonnage
Hheightactuator for hot runner valve gate systems Dinjection molding machines is getting bigger —
Specifically for the construction of stackmolds,. The in press sizes, that is. The company is cracking the
advantage of this 'Compact Stack Mold' technology is 100-metric-ton range of clamping force. Fakuma
derived from the staggered arrangement of the cylinders 2018 was the world premiere of Boy's largest press
to the side of the nozzle and the use of rocker levers to to date: the Boy 125 E, a 125-tonnes machine.
transmit the movement from the cylinder to the needle Wolfgang Schmidt, export manager Said,“What's the
motivation to top 100 tonnes? As Boy has added more
and tip solution used. Stack molds made in this way have
multicomponent molds in recent years, "the molds are
getting bigger. One reason was the mold space and the
other, of course, was larger tonnage. More mold space
was the most important"
Multicomponent molds — some of which have been
designed to handle up to six injection units, Boy
said — require larger machines. They also have rotary
platens. At Fakuma, the 125 E was with the molding
two-component cups. Both components were styrene
acrylonitrile but in two different colors. First, the press
molds the white cup body, and then the Boy LR 5 robot
much lower construction heights than versions in which repositions the cup in the upper cavity of the mold for
the cylinders and needles are aligned. The required plate the second, overmolded shot. The robot then removes
thickness is then 132 mm for offset nozzles and 212 mm the finished two-component cups and places them on
for in line nozzles in the case of HRSflow's Ga range a conveyor belt. Boy's 125 E has a clear width of 470
designed for medium to large shot weights. millimeters (18 inches) between the tie bars, instead
of the previous distance of 430 mm. The maximum
Available for PP, ABS and PC/ABS, this new technology platen distance has been extended to 825 mm (32.5
is mainly used for big automotive parts such as bumpers inches) as standard in order to accept rotary platens.
and non-automotive applications such as bins or pallets.
Stephan Berz, Vice President HRSflow Sales, states:
"Stack molds with a lower height often allow the use of
smaller injection molding machines, which then lead
to much lower running costs. In this way, our 'Compact
Stack Tool' technology helps to make the operation of
stack molds even more economical." Stackmolds have
two or more parting lines. This makes it possible to fill
cavities arranged in a row with one shot, thus increasing
productivity. Typical applications include, for example,
the simultaneous manufacture of differently shaped
parts that are then immediately assembled to create a Boy will begin full production of the 125 E by spring
sub-assembly.Because HRSflow's new, low-height'Compact 2019. Boy is also showing a telescoping version of
Stack Mold' technology allows thinner plates, the guide the LR 5 removal handling robot on a Boy 35 E. The
and support elements can accordingly be designed compact linear handling system is especially good for
smaller, thus saving additional costs. production sites with low ceilings.

Plastics News November 2018 6466