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Compression moulding parameters

Na, S., 2008. Global optimisation of mould fiUing parameters during the constant speed injection compression moulding process . Master s of Engineering thesis. University of Auckland. [Pg.379]

A clear improvement of the mechanical characteristics with regard to tensile and impact characteristics of multilayer web reiirforced PLA composites was achieved by using modified process parameters (compression moulding technique CP-2). In comparison to the processing technique CP-1 a pre-drying step was inserted (2 hr at 105°C) and the compression molding time in the hot press was reduced to 5 min. The cooling of the composites occurred in a cold press for 5 min at 25°C. [Pg.192]

The investigations have shown a great reinforcement potential for cellulose fibers in PLA matrices. The kind of semi-finished products as well as the composite production parameters has a big influence on the mechanical composite characteristics. Results proved a clear increase of the tensile strength by a modification of the process parameters up to values more than double as high (A pre-drying step was inserted for 2 hr at 105°C, the compression moulding time was reduced from 10 to 5 min and the cooUng was carried out in a cold press at 25°C for 3 min instead of 30 min at room temperature). [Pg.195]

In rubber testing, the surface finish of metals is of importance, for example on mould surfaces and compression set plates. There are a number of standards in the ISO Geometric Product Specification series but the most relevant is ISO 428729 which covers terms, definitions and surface texture parameters relating to the profile method of measuring surface finish. There are apparently over 1000 different parameters to characterize surface finish30 but only a few are generally encountered. The most commonly found is Ra (previously called CLA) which is the mean deviation of the surface profile above and below the center line, followed by Rz, a measure of the peak to valley height. For example, the arithmetic mean deviation (Ra) of the compression plates for compression set tests must be better than 0.2 m. [Pg.103]

The glass transition temperature is therefore a fundamental material parameter for manufacturing and future applications. Polymers such as PVC are usually processed by compression/injection moulding or extrusion and an adequate manufacturing temperature is required (normally 50-100 °C over the Tg point). The application temperature must be significantly higher than Tg (typically 50-60 °C) in order to avoid mechanical problems such as creep. [Pg.43]

The combination of injection and compression driven flows results in the relatively large number of parameters required to define a CRTM mould filling stage. Figure 11.2 presents schematically a mould, defines several key process parameters and illustrates two simple mould Ailing scenarios. Mould filling is initiated with the loading of the preform into the mould. [Pg.351]

Hsu, S., Ehrgott, M. and Kelly, P. A., 2010. Optimisation of mould fiUing parameters of the compression resin transfer moulding process , 45th Annual ORSNZ Cortference, Auckland, 29-30 November 2010. [Pg.380]

The compression set is an interesting parameter and not only relevant for mechanical bonding but also for the overall performance of a gasket or any other related application - irrespective of whether it is a simple moulding or a composite structure. [Pg.311]


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See also in sourсe #XX -- [ Pg.88 , Pg.89 ]




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