PSI aims at solving practical solutions

James Snodgrass
EUROPEAN PLASTICS NEWS

Published: October 29, 2013 4:05 pm ET
Updated: October 29, 2013 4:06 pm ET

Related to this story

Topics Machinery, K 2013, Business News & Features

DÜSSELDORF, GERMANY — Being invisible is something of a compliment for Don Macnamara, general manager of PSI-Polymer Systems Inc.

The Conover, N.C.-based firm sees its role as "from the extruder to the die," and its innovations as practical solutions for reducing downtime and mechanical failure.

"They're innovations but they're within the heart of the machine so it's difficult to actually see them," Macnamara said. "The products that we make fit that envelope. That's where the melt pumps and the screen changers and the mixers all come in. Then we stop at the die so we're not stepping into an underwater system or something else that somebody's making."

PSI is showing several innovations at K 2013. One is a lip seal for gear pumps, seals being at the heart of PSI's business, since its formation 13 years ago.

PSI sought to address the leakage from gear pumps of low and very-low viscosity melts. Macnamara explained: "The closer the polymer gets to water, the less likely the machine is to be able to prevent that fluid from escaping past the seal. A seal ultimately wants to form against a viscous material."

Lip seals traditionally use packing seals, typically TPFE, which wear and require maintenance. The PSI innovation is the addition of a u-ring. Anything that passes the packing gland forms up into the u-ring. If it pressurizes the u-ring, it pushes the u-ring up. So the ID pushes against the spinning shaft and the OD pushes against whatever constraint it's sitting in.

It's a simple solution, but an effective one.

"To a degree it's become an OEM product because the OEMs like it so much they're putting it in their equipment and sending them out," Macnamara said.

Another seal developed by PSI is a low viscosity seal for bolt-type screen changers. The seal technology works with polymers with extremely low viscosities and has been tested on viscosities as low as 1cP (e.g. toluene) to 300,000 cP and, PSI claims, it is capable of sealing nitrogen at over 3,000 psi.

The seal can be used in any PSI piston-type screen changer unit or divert valve and, the company claims it is idea for processing high melt materials, adhesives and solvents.

A third innovation on display at PSI is a three-way divert valve allowing an automatic changeover of the melt stream from extruding to a pelletizer to extruding adhesive pillows, from the same extruder.

"Our customer wanted two through-bores. So they wanted a through-bore they could go over to feed the pelletizer and they wanted one through-bore that could go over and feed the pillow line," Macnamara explained. "So, depending on the position that they shift to, and they could fly through one, they can actually shift it over and divert the material this way, or shift it this way and the material just goes to the ground."

Macnamara said that the divert valve could be used for other extrusion applications that require a quick change-over, including profile extrusion.


Comments

PSI aims at solving practical solutions

James Snodgrass
EUROPEAN PLASTICS NEWS

Published: October 29, 2013 4:05 pm ET
Updated: October 29, 2013 4:06 pm ET

Post Your Comments


Back to story


More stories

Image

Munson Machinery expanding assembly, testing operations

July 22, 2014 2:02 pm ET

Munson Machinery Co. Inc. is expanding its headquarters factory by about one-third in Utica, N.Y., where the company makes mixing, blending and size-...    More

Image

Windmöller & Hölscher looking to continued growth in China

July 21, 2014 3:40 pm ET

With 2013 global sales of 600 million euros, China has grown into an important export market for Windmöller & Hölscher KG, second only to the United...    More

Image

Thermoforming Technology Group adds Lyle Industries to its portfolio

July 18, 2014 2:48 pm ET

Thermoforming Technology Group LLC has expanded its thermoforming equipment presence with the acquisition of Lyle Industries Inc.    More

Image

Infiltrator goes very large scale for injection press

July 18, 2014 1:45 pm ET

Infiltrator Systems Inc. has designed and built a mammoth injection press, with 6,000 tons of clamping force, to mold septic tank halves measuring 15 ...    More

Image

Milacron names Gallagher COO

July 17, 2014 1:41 pm ET

U.S. machinery maker Milacron LLC has named John J. Gallagher III as Chief Operating Officer for its Melt Delivery & Control Systems, Fluid Technologi...    More

Market Reports

Injection Molders Market Report & Ranking 2014

This special package contains our 132-page 2014 Market Report on the Injection Molding segment and our exclusive 2014 RANKINGS database of 500+ Injection Molders for a discounted package price.

Learn more

Plastics Recycling Market Review & Outlook 2014

This special report from Plastics News examines the North American plastics recycling industry and provides insight into indicators that impact market viability, including Resin pricing trends for virgin and recycled market material and historical Resin production trends for post- consumer and industrial waste.

Learn more

Shale Gas Market - Analysis of North American Region

This report highlights the impact of shale-based natural gas on the North American plastics market and features an in-depth analysis of production trends in the United States during 2013 and a forecast for 2014 and beyond.

Learn more

Upcoming Plastics News Events

September 10, 2014 - September 12, 2014Plastics Caps & Closures 2014

February 4, 2015 - February 6, 2015Plastics News Executive Forum 2015

More Events