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.

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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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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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CPE: A unique polymer for rubber and plastics extrusion

Chlorinated polyethylene (CPE) polymers were developed by DuPont in the late 1950s by a simple chlorination of polyethylene (PE) in a solution process using a solvent. In 1971, Dow Chemical Company introduced Tyrin CPE using a more efficient and cost-effective aqueous suspension chlorination known as the slurry process. The polyethylene feedstock is in a powder form and the final CPE product remains in powder form. The chlorination process can be modified to produce amorphous (non-crystalline) products or products that contain residual crystallinity

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Medical tubing process and die optimization, part 1: Troubleshooting and fine tuning

An extrusion die is a purpose built tool designed by cutting shapes in plates to reflect an intended extruded rubber product. In advance of an extrusion project, a process engineer designs the die according to specifications of the project and those of the customer, and installs it on an extruder. Often, an extrusion die is made from hard metal, like steel, polished and with sharp edges. Once all plates of the mold or die are created, rubber is forced through them under high pressure in a high temperature zone

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