MACHINERY | DIE DEVELOPMENTS


inner layer is thin, the middle layers are high density, and the outer layer is thin but strong. The goal was to use a minimum number of extruders and minimal effort, to switch from product A to product B. To accomplish this, a distribution block was designed with two flow channels: one for the inner layer and another for a thicker layer above it. The two extruders supply these channels with the layers. Due to its smaller dimensions, the extruder for the inner layer was optimised for higher output. Two-layer die heads were then mounted on the distribution block with two melt lines. Both melt streams are distributed by a spiral distributor. A replaceable colour stripe unit was mounted in the head, which allows the melt to be fed from above via a melt bridge from an extruder. The first task was thus successfully solved using three extruders. To implement the second solution, it is necessary to dismantle the colour stripe unit and install two coextrusion units. In principle, it is possible to work with radial distribution here. However, this design has the disadvantage that it must be built with a larger diameter than spiral distributors.


Due to the small centre distance of the


Y-distributor, small helical distributors optimised for throughput were used. The thinner layer further inside is fed via the same melt bridge and extruder as the heads. The same melt bridge and extruder were also used for the colour stripe. The throughput between the left and right


strands is finely adjusted using screws in the melt bridge. Turning these screws reduces the throughput. Practical experience has shown that this is not necessary. It is understandable that both heads have the same flow channel and the same temperature. As a result, the flow resistance is also identical, which in turn influences the throughput or layer thickness. The advantage of this system is that it can make two different products from the same material at high performance using only four extruders, says Conextru.


CLICK ON THE LINKS FOR MORE INFORMATION: � www.battenfeld-cincinnati.com � www.kraussmaffei.com � www.rollepaal.com � www.tecnomaticsrl.net � www.guill.com � www.conextru.eu


Wood Plastic Composite Systems –


Enhancing future systems with Dow There’s a lot of talk – and increasing action – around sustainable practices. The building and construction industry is no exception. Homeowners and builders are looking for sustainable and lower-maintenance alternatives to wood for decks, rails, fences, boardwalks, docks, siding and facades.


This webinar will explore how Dow’s diverse product portfolio of lubricants, coupling agents, and capstock materials can help improve product performance, aesthetics, and process efficiencies by allowing increased recycled plastic content – such as milk jugs, shopping bags, detergent bottles and packaging film – and increased wood content, helping innovate your processes while supporting sustainability efforts.


This webinar will also include:


Wood Plastic Composite Webinar


Find out how Dow can help improve both your process efficiency, sustainability, and product performance.


Date:


September 9, 2025 Time:


10:00 am EST


Location: Online Webinar


(Link will be provided upon registration)


• Expert Insights: Gain valuable perspectives from Dow technical experts who are shaping the future of the market.


• Cutting-Edge Innovations: Discover Dow’s latest advancements in the wood plastic composite market and their potential to revolutionize your projects.


• Interactive Q&A: Engage with our panel of experts in a live Q&A session where you can pose your questions and receive personalized advice.


Do not miss this unique opportunity to be at the forefront of innovation in the wood plastic composite market. Register now and take the first step toward higher production rates, lower reject rates and desired performance properties.


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