PU coatings tout multiple properties
Eastern Color & Chemical Co. developed several polyurethane coatings useful for plastics.
The new Ecco Rez resins include grades that are ultraviolet-light curable; others that have high adhesion and gloss; types that are waterborne for use on PVC and ethylene propylene diene monomer elastomers; and two materials designed for in-mold coating, the Providence, R.I., firm said.
Tel. (401) 331-9000, fax (401) 331-2155, e-mail [email protected] com.
BFG PUs mix best of rubber, plastic
High-resiliency and high-rebound properties are offered in new Estane polyurethanes from BFGoodrich Co.'s Specialty Plastics division.
Richfield, Ohio-based BFG said the new materials, such as Estane 58285, provide resiliency and rebound comparable to natural rubber but process like thermoplastics. BFGoodrich has grades for injection molding and extrusion and targets applications such as gaskets, medical products, sporting goods and tubing. Other key properties include improved tensile strength, abrasion resistance and paintability.
Tel. (800) 331-1144 or (216) 447-5000, fax (216) 447-6211, e-mail [email protected]
Falcon HAS robots for smaller presses
Conair Group's new HAS Series of Falcon robots, with servo drive on as many as five axes, is designed for high-speed, precision applications on injection presses from 80-250 tons of clamping force.
Alternating-current servo motors drive the three main axes of motion. Two more servo-driven axes can be added for part orientation and subarms for three-plate molding. Conair also can provide telescoping arms.
An operator can govern all operations with a hand-held pendant with a color display screen. The memory can store setup data for as many as 20 molds.
Emsworth, Pa.-based Conair said prices start at less than $40,000.
Tel. (412) 312-6000, fax (412) 312-6320.
Multibase TPE alloys used in overmolding
Compounder Multibase Inc. debuted Multiflex TEA thermoplastic elastomer alloys as alternatives to polyester and polyurethane elastomers.
The Copley, Ohio, firm said they are designed for overmolding on ABS, styrene acrylontrile, copolyester, polycarbonate, cellulosic esters and other plastics.
Multiflex TEA hardnesses range from 50-90 Shore A and flexural modulus ranges from 2,000-35,000 pounds per square inch.
The materials are based on styrene ethylene butylene styrene block copolymers.
Tel. (800) 343-5626 or (330) 867-5124, fax (330) 666-7419, e-mail [email protected]
Shell makes PBT stick for peel-seal systems
Shell Chemical Co. claims its new polybutylene adheres to polyolefins and nonpolyolefins alike in peel-seal packaging.
The Houston-based company calls its WBS1100 PBT compound a universal peel-seal system because it sticks to a variety of substrates, including PVC and polystyrene. It provides consistent seal strength and is easy to process on conventional equipment for flexible and rigid packaging.
Shell expects the developmental product to find uses in medical and food packaging, protective films, removable tapes and reclosable systems.
Tel. (800) 832-7435 or (713) 246-8108, fax (713) 241-1606, e-mail [email protected]
AlliedSignal nylon strong at knit lines
AlliedSignal Inc.'s new nylon is targeted for large-part and thin-wall applications, such as tractor decks and consumer electronics.
Capron XFI resins have high flow and extra impact strength, especially at knit lines. The Morristown, N.J., firm said Capron XFI materials are stronger at knit lines than polycarbonate/ABS alloys and retain more mechanical properties at elevated temperatures. They also bond well with Santoprene elastomers supplied by Advanced Elastomer Systems.
Tel. (973) 455-5010, fax (973) 455-3507, e-mail [email protected] signal.com.
Ohmic HX-748 sensor monitors humidity
Ohmic Instruments Co. in Easton, Md., offers a sensor/transmitter to monitor relative humidity.
HX-748 Series sensors can work at temperatures from minus 40° F to 300° F. The sensing element is made of a thin-film polymer.
Tel. (410) 820-5111, fax (410) 822-9633, e-mail [email protected] bluecrab.org.
ProSack gets tough on industrial bags
When it comes to new equipment technology, companies that make industrial bags—tough plastic bags that hold everything from plastic pellets to peat moss—have been ignored too long, according to Davis-Standard Corp.
Davis-Standard has developed a new extrusion machine, ProSack, to make blown film for shipping sacks.
The challenge is that shipping sacks cannot be slit-sealed, like other bags, because their heavy loads require very strong edges. That means film processors have to produce a continuous small-diameter bag, which requires a low blow-up ratio and a small-diameter blown film die.
Shipping sacks generally come in a narrow width of 12-24 inches and 4-7 mils thick.
The Pawcatuck, Conn.-based machinery firm said previous equipment used conventional dies with internal bubble cooling, but their effectiveness was limited because the cooling holes through the die were very small. This limited throughput to about 200 pounds an hour, with a thickness variation of 12-15 percent.
ProSack uses a three-layer Propak die. The die has a single, large-diameter hole in its center that exchanges a large volume of air inside the bubble. The machine can reach 350 pounds an hour, with just a 3 percent variation.
Three MAC extruders feed the die, and the machine uses the newest design of DSB barrier screws. A special oscillating nip and collapsing frame keep the folded edges from becoming weak. Special cooling rolls help cool the thick film without creating a weak fold.
Davis-Standard Film Systems in Somerville, N.J., developed the machine.
Tel. (908) 722-6000, fax (860) 599-0476.