Archive for January, 2003

Screwtech Engineering: Vent port stuffer improved

Wednesday, January 22nd, 2003

Following the recent sale of 12 Vent Port Stuffers to a major German/Anglo compounder, Screwtech Engineering has further improved its ‘Vent Port Stuffer’ to provide a number of vacuum connection options and an easier cleaning process between colours. The vacuum body is now in two halves, which makes it easier to dismantle for cleaning, and doesn’t disturb the high temperature bearings and seals. The unit is designed to combat the common compounding problem of material rising in the extruder’s vacuum port and blocking the catch pots or catching fire. The pair of self-wiping twin screws push material back down the port while still allowing customers to draw a full vacuum to remove moisture and volatiles. According to the company, many customers who have been limiting their throughput to prevent these problems, report increased outputs of up to 42% after fitting the unit. The success of the product is attributable to Screwtech’s willingness to let customers test the product on a Sale or Return basis so they can gauge the benefits for themselves.

Ferro Corp.: CaZn for wire matches cost-performance of lead

Wednesday, January 22nd, 2003

Three families of calcium-zinc heat stabilizers for PVC are said to be a cost-effective alternative to lead in a broad range of wire and cable applications. New Therm-Chek powder stabilizers from Ferro Corp. boast dynamic thermal stability comparable to that of lead at reduced loading levels and without higher cost. These stabilizers suit the following applications:
*General-purpose, tray, and riser jacketing: RC 149P, RC 216P and RC 197P are said to outperform tribasic lead sulfate (TBLS) in dynamic color-stability tests at process temperatures (356 F). In catastrophic testing at elevated temperatures and rpm rates, they matched the performance of lead-based products at lower loading and lower cost. Aged physical properties reportedly are equal to or better than lead. No process modifications are needed, as these additives have little effect on lubricity and processing characteristics.
*SVT, SPT, SJT and SJTW cordage: RC 232P can replace TBLS at similar cost in these cordage applications. In UL 62 tests on 14 AWG wire, it yielded higher insulation resistance than TBLS. Similar results were achieved in dynamic color-stability tests. Processing and aging characteristics are said to be comparable to those with TBLS.
*THHN and THWN: RC 215P and RC 217P meet UL 83 requirements for wet electrical resistance. Compared with a lead-based THWN formulation on 14 AWG wire, a RC 215P formulation yielded significantly higher insulation resistance values after 26-week immersion in 432 F water. RC 217P is a low-cost version of RC 215P said to have color-stability, processing, and aging characteristics equal to or better than those of lead. Tel: (216) 641-8580, www.ferro.com

Cebal Tubes: New plant in Mexico

Tuesday, January 21st, 2003

Cebal Tubes Americas, part of Pechiney SA’s packaging division, plans to invest US$10 million to build a plant in Mexico to make plastic tubes for the North American cosmetics market. The subsidiary, which already operates a multilayer laminate tube facility in Toluca, Mexico, has not announced where the new plant will be located, but said it will be in production by the end of the year.

Nordenia: Emboss Film Without Heat

Tuesday, January 21st, 2003

A patent-pending technique developed by Nordenia Technologies GmbH in Gronau, Germany, creates the effect of embossing by printing high-shrinking lacquer on film. As the lacquer shrinks, the film curls. Printing alternating lacquered and non-lacquered areas creates the cushiony effect of raised embossing. When film is rolled, the embossing flattens out, but when the film is unwound, it reappears. Nordenia Technologies is the R&D arm of film processor Nordenia International AG, which has started to show the technology to selected customers. http://www.nordenia.com

Nanocor: Cooperation with PolyOne in Nanocomposites

Monday, January 20th, 2003

Nanocor Inc.has forged a strategic alliance with compounder PolyOne Corp. of Cleveland in order to speed market penetration of polyolefin- and PVC-based nanocomposites into automotive, appliance, wire/cable, and other durable-goods markets. The latest alliance is one of several recently initiated by Nanocor, a top world supplier of nanometer-size clay particles. Nano-clays in thermoplastics impart higher strength, stiffness, barrier properties, and fire resistance while adding little to part weight.PolyOne’s contributions would include its compounding know-how, far-flung production assets, and broad access to end-use markets. The partners also plan to coordinate R&D activities on nanocomposites based on polyolefins and vinyl. PolyOne will take full control of sales, marketing, and manufacturing of nanocomposites based on Nanocor materials, including pelletized and concentrate forms.

New Laboratory Scale Extruders

Monday, January 20th, 2003

APV Baker has introduced a new generation of laboratory-scale twin-screw extruders. Features to maximise control, the acquisition and management of data, and ease of operation have been developed to meet a clear need within the powder coating, thermoplastics compounding, masterbatch and pharmaceutical sectors. An increased screw speed capability of up to 1000 rpm promotes exact replication of laboratory work to industrial scales, where the trend is to run at a higher rpm. This also extends the range of materials that can be handled. Full data logging allowing continuous monitoring of all product control parametres is an option. InTouch data acquisition software from sister company Wonderware is backed by the full resources of the Invensys group. A touch-screen terminal gives precise, immediate response. APV Baker laboratory twin-screw extruders are available in a range of processing lengths from 15:1 to 40:1. They are designed for simple operation with a clam-shell barrel design allowing easy cleaning, optimisation of the process and rapid change of screw configurations.

Carl Hanser Verlag: Polymer Extrusion book

Thursday, January 16th, 2003

Initially published by Carl Hanser Verlag to bridge the gap between theory and practice in extrusion, this 4th edition of --- Rauwendaal´s ‘Polymer Extrusion’ continues to serve the practicing polymer engineer and chemist, providing the theoretical and the practical tools for successful extrusion operations. In its completely revised form, it also incorporates the many new developments in extrusion theory and machinery over the last 15 years. Contents: Different types of extruders – extruder hardware – instrumentation and control – fundamental principles – important polymer properties – functional process analysis – extruder screw design – die design – twin screw extruders – troubleshooting extruders – modeling and simulation of the extrusion process.

NDC Infrared Engineering: Gauge measuring for thinnest OPP films

Thursday, January 16th, 2003

A new near-infrared thickness gauge from NDC Infrared Engineering,USA, is specially designed to measure cast and OPP films as thin as 2 microns (0.04 mils). Clear films that thin are difficult to measure with NIR because of surface reflections or optical-fringe interference. NDC’s new TFG 710 gauge solves this problem by using two NIR detectors side by side, sending light energy through the film twice to identify the effect of reflections. It offers higher resolution and accuracy than beta gauges, NDC says. For more information, www.ndcinfrared.com .

Industrial Plastics: New continuous flow screen changer

Wednesday, January 15th, 2003

Industrial Plastics,UK, has recently launched a new continuous flow screen changer. The IPL continuous, double slide plate screen changer is suitable for all thermoplastic resins — except PVC — and can be fitted to all types of single or twin screw extruders and melt pumps. Its’ screening area is twice as large as that of conventional models, which means that screening time is considerably extended, with a resultant saving in labour and increased output. The new model is currently available in sizes from 50 to 210 mm and the company is working on projects for units with diameters up to 600 mm. The system uses the double breaker plate principle, as the melt reaches the screen changer, it is divided and flows through two different slide plates, each of which is drilled with a series of holes, and has provision for a filter screen or screen pack. During normal operation, the two slide plates are moved into the screen changer so that the melt flows simultaneously through both. When it is necessary to change screens, one of the two slide plates is moved out using the hydraulic cylinder, the contaminated screen is replaced with a clean one and the slide plate is moved back into the melt. This process is then repeated with the second slide plate. Several variations of this model are available to suit different customer requirements.

Borealis and Trespaphan: License Agreement for PP film

Wednesday, January 15th, 2003

Borealis A/S, Denmark, and Trespaphan GmbH, Germany, have signed a License Agreement in the field of biaxially oriented PP films made from high isotactic PP. Borealis has agreed to a license fee of an undisclosed amount and has been granted the right to operate under Trespaphan’s patents related to this type of high isotactic PP.