Impact of the technological parameters for the production of UD prepreg

Capeska, Svetlana and Risteska, Svetlana and Samak, Samoil and Kostadinoska, Biljana (2017) Impact of the technological parameters for the production of UD prepreg. Knowledge - International Journal, Scientific Papers, 20 (5). ISSN 2545-4439

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Prepreg is the common term for a reinforcing fiber (fabric) which has been pre-impregnated with a resin
system. This resin system (typically epoxy) already includes the proper curing agent. As a result, the prepreg is
ready for composite parts. They provide great benefit in processing as the resin content is highly controlled, and the
application is generally very clean, requiring little to no cleanup, unlike more commonly known "wet-layups". In
manufacturing fiber-reinforced-plastic composite components, the use of prepregs reduces the work involved and
provides stronger, stiffer and more reliable parts than equivalent components produced by wet lay-up processes
like what is Filament winding technology. But these advantages will only be realized when prepregs with
consistent properties are used. Prepregs consist of a layer of fiber or cloth impregnated with a partial mixture of
monomers or oligomers, either in a solvent (solvent- type prepreg) or as a solvent-free medium (hot-melt
type). In the case of a solvent-type prepreg, the impregnated reinforcement (prepreg) usually passes through
a heating oven to decrease the solvent content. In this paper will be study the technological process of these
impregnation for the production of unidirectional (UD) prepreg by a solvent procedure. This semi product as a UD
tape will finds great application in advanced technological processes for the production of parts of aircraft or in the
space industry by using automatic tape placement (ATP) machines. Because these materials are used in modern and
automated composite machines, they should have excellent production properties. Therefore, in this paper, great
attention will be paid to the technological parameters in the impregnation process that affect the final characteristics
of UD prepregs. The width of UD prepreg is obtained as a function of the impregnation velocity, tensile of fiber, gap
of rollers. Also and the heating length is also derived to give a possible combination of impregnation
velocity and heating length to obtain a specific volatile content. This paper presents an experimental study of
the impregnation of continuous glass fiber with thermosetting resin matrix materials. Results are obtained
methodically through the separation of variables. It is found that the more technologies parameters are important in
impregnation process. The model is valid for predicting width or surface weight (gr/m2) and % volatile content
in the practical impregnation process for UD prepreg.

Item Type: Article
Subjects: Natural sciences > Computer and information sciences
Engineering and Technology > Materials engineering
Engineering and Technology > Mechanical engineering
Divisions: Faculty of Technology
Depositing User: Svetlana Risteska
Date Deposited: 15 Sep 2020 07:26
Last Modified: 15 Sep 2020 07:26

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