Article Archive

Close-Up on Technology

Features

Avoid Those Devilish ‘Angel Hairs’
Angel hairs wreak havoc on plastics processing: clogging filters, plugging conveying lines, causing feed problems at the blender, and jamming up machine throats. Here's how to prevent their formation.

How to Use Commercial Purging Compounds in Extrusion
CPCs are considered most often for injection molding. However, they also can provide the same benefits to extrusion processors.

Getting Into LSR Part III-- Choosing a Mixing/Metering System
Liquid silicone rubber (LSR ) is a two component reactive chemical with a viscous, paste-like consistency.

On Site: Pexco Takes a Two-Pronged Approach to Growth
Organic growth and growth via acquisition have combined to make this processor one of the leaders in custom profile extrusion.

Strategies

New Die Opens Up New Markets
General Plastic Extrusions Corp. found that out recently in converting a second-hand blown film line that had been used by its previous owner for R&D.

Troubleshooter

How to Get Better MFI Results
The MFI test is used widely among the various segments of the plastics industry. The difficulty is that any two labs can easily come up with different results, making it difficult to determine whether a material meets a desired MFI spec. Here are some reasons why such discrepancies occur and what can be done about them.

Keeping Up With Technology

INJECTION MOLDING: New Presses Debut at Fakuma Show
Advance word on several new press models were provided by two exhibitors at next month’s Fakuma show in Germany.

INJECTION MOLDING: Double-Flighted Screw Speeds Melting Of ‘Difficult’ Materials
In order to keep up with advances in mold cooling and the faster-cycling parallel movements of electric and hybrid machines, injection presses need ability to melt crystalline resins faster.

INJECTION MOLDING: Unitized Hot Runners
DME Co., Madison Heights, Mich., introduced two new unitized hot-runner systems based on its Stellar and Galaxy lines.

EXTRUSION: High-Performance, In-Line Coilers
A new line of inline coilers for hose, tubing, pipe, and wire/cable incorporates a dual-spindle turret winder designed to handle products from 0.032 to 0.625 in. diam.

AUXILIARIES: Batch Blender with See-Through Mixer
The newest member of the Guardian Series 2 family of gravimetric batch blender from Atlanta-based Process Control Corp., a 12-kg model, has a see-through mixing chamber door that allows for an unobstructed view of material in the mixing chamber.

AUXILIARIES: Continuous Gravimetric Blender For Extrusion
Cascade mixing in the new TrueWeigh continuous gravimetric blender from Conair, Cranberry Township, Pa., is said to result in a more homogeneous blend, even when additives are dosed in very small quantities.

ADDITIVES: Expanded Line of Additive Concentrates
S&E Specialty Polymers LLC, Lunenberg, Mass., has recently expanded its family of concentrates.

MATERIALS: New LSR for Optimum Fire Protection
WEB EXCLUSIVE: At next month’s Fakuma show in Germany, Wacker Chemie AG (U.S. office in Adrian, Mich.) will introduce two new liquid silicone rubber grades that achieve UL 94V-0 flammability rating without abrasive fillers.

MATERIALS: Clear Biodegradable Cellulosic Plastic
WEB EXCLUSIVE: A clear, high-flow injection molding grade of biodegradable cellulosic resin will debut at next month’s Fakuma show in Germany.

MATERIALS: Clearly Tough: New Higher Impact Styrene-Acrylic
WEB EXCLUSIVE: Zylar 960 is a styrene-acrylic copolymer that achieves a higher level of practical toughness without sacrificing clarity.

MATERIALS: Styrenic TPEs for Extrusion
WEB EXCLUSIVE: TPE distributor Alliance Polymers & Services offers the new Polymax D-Series of styrenic TPEs for extrusion of glazing gaskets and seals for refrigerators, dishwashers, other appliances, pipe seals, ladder feet, water stops, foamed seals, window and door seals, and solar products (Maxelast D01-011A grade has been used in solar-panel seals). Available in natural, black, or transparent grades from 30 to 60 Shore A, these TPEs come from Nantong Polymax Elastomer Technology Co.

MATERIALS: Full Range of Rigid PVC Compounds from New Source
WEB EXCLUSIVE: Long known for flexible compounds, the Vinyl Div. of Teknor Apex Co., Pawtucket, R.I., now offers rigid standard and custom formulations for a broad range of uses, such as bottles, electrical conduit, home furnishings, irrigation connectors, retail displays, and medical devices.

Know How

The Truth About Barrel Heating
The main purposes of the heaters are to melt the polymer that remains in the barrel at cold startup, to assist in forming the initial melt, and to “trim” the barrel temperatures for specific purposes such as improving feed rate.

Short Shots Redux
Deliberately making a short shot permits you to do a scientific molding viscosity curve. It will also prevent you from damaging the mold by overpacking if you set shot size incorrectly.

The Effects of Time
Last month we briefly discussed the influence of temperature on the mechanical properties of polymers and reviewed some of the structural considerations that govern these effects.

Tool Room Management: How To Lead Your Team
Real progress in a mold shop won’t be made without a qualified and motivated “driver at the wheel” who diligently searches for, and implements, continuous-improvement solutions.

Starting Up

Braskem Buys Dow's PP Business
Braskem in Brazil has acquired the polypropylene business of Dow Chemical Co., Midland, Mich.

Gas-Assist Technique Helps Solid Parts, Too
Bemis Manufacturing Co., Sheboygan Falls, Wis., a custom molder known for its expertise in coinjection, has found a way to reduce the cost of solid parts by using a well-known gas-assist molding technique—without the gas.

Now LDS Electronic Circuitry Is Colorable
Laser direct structuring (LDS) is a powerful technology for adding electrical circuit paths to plastics electronic products such as mobile phone and notebook antennas or molded interconnect devices (MIDs). But up to now, LDS-ready plastics were limited to black.

Heineken Launches PET Beer Keg
This past spring, Dutch brewer Heineken introduced a colored 4-liter PET keg for its Amstel brand of beer in the Benelux region of Europe.

Dow Explores Burning Plastics Waste for Energy
This spring, Dow Chemical Co., Midland, Mich., conducted pilot tests that validated and documented the potential for energy recovery from incinerating plastics wastes.

Vision Inspection Integrated with Press Control
Machine-operator access to 100% quality inspection of micro-part dimensions is available with the new PowerVision option from Wittmann Battenfeld, Torrington, Conn.

Acquisitions in Additives, Testing Equipment
PCC (Plastics Color Corp.), Calumet City, Ill., a maker of color and additive concentrates and compounds, has acquired Polysource LLC and its Pinnacle Color subsidiary in Tempe, Ariz.

New PC Sheet Offers Blast Protection for Buildings
WEB EXCLUSIVE: Going a step beyond the bullet-resistant security glazing familiar in banks and taxicabs, a new type of “structural envelope” based on a special polycarbonate sheet laminate from Bayer MaterialScience LLC, Pittsburgh, is said to establish a new level of bomb-blast resistance for building structures.

Sunroof Module Is All Short-Glass PP
WEB EXCLUSIVE: The first fully integrated automotive sunroof module made entirely of short-glass PP replaced long-glass PP and short-glass ASA/PBT on the 2010 Cadillac CTS.

Resin Prices

Falling Resin Tabs May Rebound
The downtrend in prices for commodity thermoplastics continued through last month due to lower feedstock prices and poor domestic and export demand.

Column

Wood On Plastics: Auto Sector Exhibits Resilience
Despite tremendous obstacles, both the number of motor vehicles assembled in the U.S. and the total number of new cars sold in this country have still managed to register strong growth for the year to date.

Your Resource for NPE
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