MDP nonreturn valve offers repeatability
MD Plastics Inc. of Columbiana, Ohio, has introduced the MDP sliding-ring, nonreturn valve that the company said provides very low pressure drop and consistency of part weigh from shot to shot.
The nonreturn valve incorporates a shaft and retaining bushing assembly engineered to transform the sliding frictional force that normally occurs in a screw tip into a radial force.
MD Plastics President Mike Durina said he was surprised with the initial test results, which ``looked too good to be true.''
``In fact, more recent test results have shown that our MDP screw tip was 10 times more accurate than what was determined in tests performed both by a major independent research lab, and in previous studies at a major supplier of front-end components,'' Durina said.
The shaft and bushing assembly restricts the ring's forward motion, to determine stroke during plasticizing. The ring is forced against the assembly through viscous drag.
Then, the hydraulic pressure of the plastic transforms the sliding force that normally occurs between these two surfaces into a radial force between the shaft and bushing.
Durina said a radial motion is less abrading that a sliding force, so there is less wear. That geometry contributes to much lower pressure drop across the ring giving better shutoff accuracy and shot-to-shot consistency.
Tel. 330-482-5100, fax 330-482-5211, e-mail [email protected]
EarthSmart chillers don't deplete ozone
Conair Group Inc.'s new line of EarthSmart portable chillers are the first to use new environmentally friendly R410A refrigerants, according to the company.
Initially, Conair is launching air- and water-cooled EarthSmart chillers in six sizes, from 1.5 tons to 15 tons. The company plans to add larger and smaller sizes.
``Soon, all chillers will need to use a new, non-ozone-depleting refrigerant like R410A,'' said Wes Sipe, general manager of the Conair Heat Transfer Group.
The U.S. government has mandated the phaseout of conventional R22 refrigerants, known as Freon, by 2010, Conair said.
``Conair is stepping up to make the transition now, because it is the right thing to do environmentally and it is best for our customers in the long run,'' Sipe said.
Developing a portable chiller to use R410A gave Conair the opportunity to re-evaluate every component of the unit, and make the new chillers easier to use and maintain.
All models will have the same multifunction microprocessor control system, based on open-architecture software. These control features historically have been available only on high-end chillers, but now they are standard equipment on the EarthSmart.
In other news, improvements made to Conair's Medline puller/ cutter enable producers of small-diameter medical tubing to set, control and validate the gap between puller belts automatically.
Conair has replaced the conventional manual-adjustment wheel used to establish and maintain the gap between belts with a small servomotor, in-line planetary-gear reducer and digital controller.
Maintaining the gap between belts controls the consequent pressure, or ``crush'' on the tubing. The new control communicates with an in-line laser gauge, which sends a real-time signal of the outside diameter of the tube. The puller gap automatically follows the actual size of the tube.
Medical extruders can validate control over this process variable.
Conair is headquartered in Cranberry Township, Pa., a Pittsburgh suburb.
Retrofit controllers save on energy costs
Plastic Metal USA claims retrofit hydraulic servocontrollers cut electricity consumption of its injection molding machines by 30 percent. For example, an injection press with 2,000 tons of clamping force can average $2,000 in energy savings per month.
The control technology was developed by Industrial Control Solutions Inc. and its founder, Roger Fritz.
The system works by following a carefully tuned profile of how much energy and pump speed is needed during different portions of the holding cycle, allowing the hydraulic pump system to use only the amount of energy required to produce quality parts.
Plastic Metal is based in Oyster Bay, N.Y.
Tel. 914-582-1848, e-mail [email protected]
Kortec Inc. develops 10-ounce OPP bottle
Coinjection system supplier Kortec Inc., working closely with Milliken Chemical, has developed a line of 10-ounce multilayer oriented polypropylene food and beverage containers using Ball Corp.'s Gamma-Clear technology.
One breakthrough is the small size of the container. Until now, most Gamma-Clear applications were wide-mouth bottles for products such as pasta sauce and fruit preserves. The new, 10-ounce containers are narrow-neck packages.
Ipswich, Mass.-based Kortec said the injection stretch blow molded OPP containers have several advantages over previous container designs, which were extrusion blow molded.
``They are almost 40 percent lighter than the previous plastic containers, they are as clear as PET and they cost much less to produce,'' said Scott Ludwig, Kortec's business development manager.
The previous PP extrusion blow molded fruit juice container also had a cloudy appearance, and weighed more than 30 grams. The Gamma-Clear container weighs less than 19 grams.
Ludwig said blow molders can save as much as $20 in production costs for every 1,000 containers.
Milliken supplies Millad clarifying agent for PP.
Tel. 978-238-7191, e-mail sludwig @kortec.com.
Revolution roll stack has horizontal setup
Processing Technologies LLC of Aurora, Ill., said its new Revolution horizontal roll stack is well-suited to run thin-gauge materials with low melt strengths.
Vertical roll-stand setups typically struggle while producing that type of sheet, because the molten plastic tends to droop while it exits the horizontal sheet die lip and enters the primary nip point of the chill rolls, where the transformation from molten plastic to sheet takes place, PTi said.
That sagging also can cause premature cooling of the molten curtain of plastic as the material contacts the middle roll at an undesirable point before the primary nip is reached.
With the Revolution roll stand, the plastic exits the die vertically downward, so it can be accurately placed between the primary nipping rolls, ensuring that the material contacts both sides at precisely the same moment.
PTi said the Revolution technology has yielded benefits for producing high-quality, clarified, thin-gauge polypropylene sheet.
Tel. 630-585-5800, fax 630-585-5855.
Dri-Air distributing robots for Sytrama
Dri-Air Industries Inc., which makes dryers and loaders, has gotten into the robot business through a distribution agreement with Italian robot firm Sytrama srl.
Dri-Air now is the sole distributor of Sytrama robots in North America and Latin America. Dri-Air also will provide parts and service out of its headquarters in East Windsor, Conn.
Sytrama supplies beam robots and rotary robots, including standard and custom-made automation. The company is based in Vignate, Italy, near Milan.
Sytrama robots can be used in pick and place to a conveyor or other downstream equipment, stacking on pallets, sprue cutting, in-mold labeling for injection molding and thermoforming, systems for handling PET preforms and assembly for CD jewel boxes.
Tel. 860-627-5110, e-mail [email protected] dri-air.com.
MGS units to support Gammaflux controls
MGS Manufacturing Group Inc. will offer Gammaflux LP's hot-runner temperature control on all of its Universal Multishot brand of portable injection units.
MGS is based in Germantown, Wis. Gammaflux is in Sterling, Va.
MGS has worked with Gammaflux to develop hot-runner controls specially designed for multishot molding. The Gammaflux control and screen is integrated into the MGS screen.
Gammaflux offers a five-year warranty on hot runner controls.
Tel. 703-471-5050, fax 703-689-2131, e-mail [email protected]
PSG controllers tout complete diagnostics
PSG Plastic Service Group said two new models of hot-runner controllers, the Temp-command series and HRD series, feature a diagnostic system that protects against errors in the wiring of connecting cables and hot runners, along with failures in components of heaters and sensors.
The mold-check function protects the hot-runner system, according PSG of Stevensville, Mich.
Temp-command controllers can come pre-wired for startup, or supplied in a special housing capable of controlling up to 256 zones. HRD controllers come in versions with from six to 30 control zones, packaged in a compact table housing.
Tel. 269-556-7051, e-mail [email protected] psg-online.us.
Macchi cooling ring made of carbon fiber
Macchi SpA introduced a double cooling ring made of carbon fiber as a standard offering for its blown film machinery.
The company, based in Venegono Inferiore, Italy, said the carbon-fiber cooling ring is lighter than a metal ring, and gives air flow and no condensation.
Macchi also has improved its Coex flex 3.4 blow molding machine with an on-board control panel, to make the line more compact, and a new wireless operator interface panel.
The blown film machine uses Siemens gearless motors on the extruders.
Macchi North America Corp. is based in Gainesville, Ga.
Tel. 678-450-8170, fax 678-450-8172, e-mail [email protected]
Sprue adjuster offers melt-flow flexibility
I-Mold GmbH & Co. KG has developed a sprue adjuster, which the company said enables a toolmaker to change the direction of melt flow in the runner system of an injection mold.
By a simple turn of the sprue adjuster, the flow of melt to the individual mold cavities can be selectively freed or blocked. The setting is done manually from the mold-parting surface, when the mold is open. I-Mold said this is very easy to do and requires only a brief interruption of the molding cycle.
This makes it possible, for example, to isolate a bad cavity, or in family molds to isolate a cavity that is needed for some applications but not all.
The sprue adjuster is available in three sizes. The toolmaker machines the melt flow-ways into the sprue adjuster's cylindrical body.
I-Mold is based in Brensbach, Germany. In North America, the sprue adjuster is sold by DMS Inc. of Oldcastle, Ontario.
Tel. 800-265-4885, e-mail mikeh @dmscomponents.com.
Machine automates flexible pipe coiling
Pipe Coil Technology Ltd. of Wallsend, England, has developed an automatic strap coiler for flexible pipes up to 7.2 inches in diameter.
The machine automates the coiling and packaging process for large-diameter flexible pipes, normally a labor-intensive process. For maximum efficiency, the coiler can be combined with a system that eliminates an oval shape in extruded pipes.
Tel. 44-191-295-9910, fax 44-191-295-9911.
TRIM cuts weight on thin-wall parts
StackTeck Systems Inc. has developed TRIM technology for thinning out the part wall section of injection molded packaging.
TRIM, for thin recess injection molding, can cut part weight by 20-40 percent, from conventional thin-wall part design.
``We believe that we can achieve part weights that will make injection molding much more competitive against thermoforming, while maintaining key functional features such as the tamper-evident rim on a container and a high top load compression strength,'' said President Randy Yakimishyn.
StackTeck of Brampton, Ontario, is showcasing TRIM in an in-mold-labeling pilot cell at its plant. The cell is a joint effort by press maker Netstal Machinery Inc. and IML robot maker CBW Automation.
Tel. 416-749-0880, fax 416-749-9669, e-mail [email protected] teck.com.
Tube line extrudes medical PS pipettes
Boston Matthews Inc. of Norwood, N.J., has introduced an extrusion line for making medical polystyrene pipette tubes.
The line extrudes, sizes, dries and accurately cuts the PS tubes without marking or shattering.
Direct-drive using an alternating current Vector motor ensures a clean, brushless operation and maximum transmission of power.
Sales director Simon Brookes called styrene ``extremely tricky'' to cut without causing damage. ``It is essential that the tubes be accurately cut to tolerance without any imperfections or swarf, as the tubes are subjected to several completely automated post-extrusion processes,'' he said.
Tel. 201-767-7111, fax 201-767-6293, e-mail [email protected] matthews.com.