Continuous extrusion processes for elastomeric materials
Principal methods for processing elastomeric materials are reviewed, including continuous extrusion and what is described as multi-step extrusion.
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Extrusion
Effect of Thermax N990 on EPDM electrical percolation threshold
Blends of hard clay, N990 and N550 were utilized to evaluate the electrical percolation region of EPDM compounds; and the viscosity and physical properties of the compounds were also measured.
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Novel approach to solve EPDM bonding issue without surface treatment
High dyne EPDM compounds offer an exceptional high surface energy level with a minimum of 58 dynes/cm, which is higher than all known rubbers, and at least twice as high as that of a typical EPDM compound.
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High efficiency twin screw extruder
The demand for performance and consistency of elastomer based compounds is growing quickly in all fields (tire, technical rubber goods, cables). Specifications regarding physical, mechanical and chemical properties, as well as “visual aspects” properties of the finished products are becoming more and more strict.
During compound production, all operations are involved, from the weighing to the storage of the semi-finished mixed compounds. The mixing operation plays a very important role, since it is the step where all ingredients are incorporated, dispersed and distributed.
Optimizing cost savings in EPDM extrusion compounds
EPDM has not been immune to significant price increases, material shortages and allocations. As extrusion expenses are dominated by material cost and throughput, price and efficiency are of the essence. One of the most common ways to improve cost efficiencies in extrusion compounds is to lower material cost by extending the polymer as much as possible using high amounts of filler, for which EPDM is perfectly suited. The other option to decrease costs is to run more product in the same amount of time, requiring a material with higher extrusion rates.
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Expanding the high Mooney viscosity platform: New sponge grade K13951C
by Pete Spanos, Raffaele Bernardo and Montse Alvarez Grima, Arlanxeo As the number one non-tire rubber by volume, ethylene propylene
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Extrusion process for high consistency silicone rubber: A brief overview
components. In the medical technology, automotive and food industries, silicone rubbers are often used as media carrying components in the form of hoses or profiles. All applications have in common that high demands are placed on the material, as well as on the geometric dimensions, and thus on the manufacturing process.
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Davis-Standard introduced new compact extruder for coating applications
Davis-Standard introduced a new compact extruder engineered for extrusion coating applications – the CHP. The machine’s sleek design offers a smaller footprint and lighter weight to allow for easier addition to an existing carriage or platform structure. This provides processors with a space-saving replacement or coextrusion addition for increasing outputs and line speed
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Guill Tool introduces a co-extrusion crosshead designed for irrigation tubing
Guill Tool introduces Series 824, a co-extrusion crosshead designed for irrigation tubing with an emitter tool. Manufactured from stainless steel, this new crosshead features balanced flow design with spiral technology that improves flow characteristics at all extruder speeds. Dual feed ports provide concentric compound flow, while the splits flow from one extruder to feed the inside and outside layers via a manifold assembly. Series 824 is adaptable to all popular extruders on the market currently
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Medical rubber tubing process and die optimization: Die redesign and fine tuning
Part 1 of this contribution, published in the May 2021 edition of Rubber World, investigated a real manufacturer’s process that was set to produce medical tubing. It was found (through trials at the extruder, then through simulations) that the equipment available to the manufacturer was too large for the relatively low output that was required for this project, and consequently the polymer was degrading on the screw surface. It was ultimately determined through simulation that a smaller extruder, with a screw optimized for the low rate, would work better.
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