Implementation of data collection technologies in UV-cured prepreg manufacturing processes

Abstract

  This work presents recent advances in the optimization of an 
automated process for manufacturing glass fiber composites, 
based on the production of UV-cured prepregs. The aim of this 
development is to facilitate the production of glass fiber parts 
with a polyester matrix, ensuring a repeatable and controllable 
process. Moreover, this innovative technology enhances process 
efficiency and improves the quality of the final product. 
This work focuses on monitoring the manufacturing process 
using specific sensors, such as laser measurement devices 
and thermocouples, with the aim of controlling key process 
parameters, including the impregnation temperature and 
the thickness of the resin layer deposited on the dry fabric. 
Continuous monitoring, enabled by the integration of a data 
acquisition and analysis platform, makes it possible to improve 
both the quality and efficiency of the process. It also facilitates 
the development of models for implementing adaptive controls, 
issuing reprocessing instructions, and validating product quality 
in real time. 
Within this framework, temperature at various stages of 
the process and the resin content in the prepreg have been 
monitored and analyzed, establishing their correlation with 
machine parameters that govern the impregnation process. 
Resin content was measured using a newly patented device (EP 
23382517.3), and the results were compared with fiber content 
measurements obtained through weight difference analysis. 
In this project, the UV-curing prepreg manufacturing process 
was successfully monitored, enabling real-time visualization 
and analysis of key process parameters. This revealed a clear 
correlation between these parameters and the resin content, 
laying the foundation for future full machine automation. 
This technology can be applied to UV-curable resins, including 
acrylic thermoplastics, bio-based, flame-retardant, or dual-cure UV and thermal resins, as well as to all types of glass fibers, 
thereby broadening its applicability across various composite 
manufacturing processes.