Roll with it

Prepreg technology specialist, Cygnet Texkimp will unveil its Multi Roll Stack at JEC World in campaign for higher-rate composite components.

Cygnet Texkimp will unveil its vertically stacked towpreg and prepreg manufacturing machine at JEC World in Paris next month. The full-scale Multi Roll Stack will be showcased on Cygnet Texkimp’s stand at hall 5, stand M72.

The small-footprint machine was developed by the company’s prepreg technology specialists as a lower-cost solution in terms of capital investment, running costs and energy requirements, when compared to conventional prepreg processing. It was designed to manufacture high performance prepreg and towpreg materials more efficiently and sustainably without compromising accuracy of the product, speed, or consistency, and so offer the potential for cost effective prepregs and towpregs to be used more widely.

The machine was developed as part of a UK collaboration to achieve high-grade, composites-intensive components at rate for high-volume markets. The ASCEND programme is a four-year, £40 million project launched in 2021 and led by GKN Aerospace with funding from the Aerospace Technology Institute (ATI) and Innovate UK. The ongoing project was created to develop the technical and supply chain capability to manufacture high-grade, composites-intensive components at rate. Cygnet Texkimp is a partner in the consortium which is made up of 14 UK organisations including the National Composites Centre.

The Multi Roll Stack is a UD (unidirectional) and fabric prepreg impregnation machine comprising a series of compaction rollers configured vertically. It is a major departure from conventional in-line prepreg machines which incorporate separate compaction stations (compactors) arranged in a horizontal line. In contrast, the Multi Roll Stack features a single compaction module containing multiple impregnation rollers arranged vertically.

The material passes around the Multi Roll Stack’s heated impregnation rollers in an S-wrap formation, increasing contact with the rollers throughout the process and reducing the energy required to achieve impregnation of the resin within the fibres. One aim of the design was to reduce or remove the heating-cooling cycle, which is typical in conventional in-line prepreg technologies, so that the temperature of the material remains consistent. This is significant because it results in lower energy consumption and reduced material scrappage, while maintaining consistency and accuracy in the finished prepreg and the performance in the resulting component. The production speed and coat weight accuracy achieved by the Multi Roll Stack mean it is capable of manufacturing precision towpregs, using the same resin systems commonly used in the aerospace industry.

By configuring the technology in this way, Cygnet Texkimp has shortened the machine’s footprint by more than 50% (with greater space savings relative to larger machines) and increased processing speeds. Stacking the rollers within one compaction module removes the need for multiple drive motors and heaters, which in turn also reduces energy consumption and cost by more than a half compared to conventional prepreg technologies. The machine’s shortened web path also leads to reduced material wastage and the compact design will reduce CapEx costs.

“This space-saving machine offers a way to manufacture towpreg and prepreg materials quickly and accurately while delivering considerable cost and energy benefits,” explains Graeme Jones, wide web product director at Cygnet Texkimp. “It is a more sustainable and cost-effective way to process prepregs which offers the potential for them to be used more widely in high-volume and mainstream applications. Trials of the technology have been extremely positive with high accuracy, low coat weight prepregs of 112gsm being achieved at speeds of 10m per minute, with upper limits of performance still to be discovered.”

Following JEC World, the Multi Roll Stack will be available for industry trials at Cygnet Texkimp’s new Innovation Centre, based at its UK headquarters in Cheshire.

https://cygnet-texkimp.com