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Processing

  • In this chapter, some relevant aspects and illustrative examples of online monitoring tools as the basis for process control in the manufacturing and processing of thermosetting resins are briefly discussed. In principle, any chemical or physical information made accessible by sensors can be used for online monitoring of resin formation, resin location in the mold, and resin cure. For instance, changes in the flow properties of the reaction mixture are often routinely recorded in dependence of the reaction time during resin synthesis as a measure for the degree of conversion of raw materials into macromolecules or oligomers by applying rheometry in an in-process environment. Typically, a small sample of the reaction mixture is by-passed, subjected to rheological measurement, and re-introduced into the bulk reactor. In a similar way, pH measurements, turbidimetric measurements, or other analyses are performed. Although rheometry may not always be suitable for following resin cure (especially in cases where there is a very rapid increase in viscosity after initiation of the cure), [1] naturally, the method can in principle also be used in the subsequent processing of the thermosets, for instance in the curing of wood glue applied to wood specimen [2]. Similarly, pH changes during thermoset curing can be followed. Hence, an encyclopedic and comprehensive approach to present process control methods would systematically proceed according to the involved physical measurement principle. However, since only a very Brief sketch of means for monitoring thermoset processing can be given here, only a small, personally biased selection of important methods and application examples is addressed in the following sections. These examples hopefully illustrate some of the general strategies and solutions to problems that are typically encountered when processing thermosets.

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Metadaten
Author of HS ReutlingenKandelbauer, Andreas
ISBN:978-145-573-107-7
Erschienen in:Handbook of Thermoset Plastics
Publisher:Elsevier
Place of publication:Amsterdam
Editor:Sydney Goodman, Hanna Dodiuk-Kenig
Document Type:Book chapter
Language:English
Publication year:2014
Tag:dielectric sensor; fiber bragg grating; online monitoring; optical spectroscopy; process analytics; resin cure
Edition:Third Edition
Page Number:30
First Page:731
Last Page:758
PPN:Im Katalog der Hochschule Reutlingen ansehen
DDC classes:660 Technische Chemie
Open access?:Nein