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“What is this thing?”<\/strong><\/span><\/p>\n <\/p>\n Well, this page is actually extremely technical, and probably will be visited and understood by a small number of experts. In our view, however, one of the great opportunities of the web is to give everyone the chance to enter even the most difficult subjects, without any fear, and if the content is not written in an overly abstruse, anyway to understand something. For this reason, first of all some basic notions will be explained (that skilled persons know for sure).<\/p>\n <\/p>\n Prepregs<\/strong> are one of the most important semi-finished products which are used in the production of composites.<\/p>\n <\/p>\n All composite materials<\/strong> are made of two components<\/strong> :<\/p>\n <\/p>\n In the beginning the resin is in a liquid or viscose status and can be spread on the fibers. By subjecting the two components (fiber and resin) to a special heat cycle<\/strong> (called polymerization <\/strong>if you are technical and sophisticated, cooking <\/strong>if you are quick) the permanent hardening of the resin is obtained and the item in composite material is made.<\/p>\n <\/p>\n Prepreg Slicing 2016-02 001<\/p><\/div>\n Many ways to put together fibers and the thermosetting resin <\/strong>are possible. For example one can start from a continuous filament that is wrapped on the mold and simultaneously impregnated with resin (the process is called filament winding<\/strong>). Or a dry tissue is taken, placed on the mold, and the thermosetting resin required applied (with various systems, for example with a paintbrush in the hand lay up<\/strong> process) .<\/p>\n <\/p>\n Prepreg<\/strong> is the solution that foresees the use of a semi-finished product<\/strong>, consisting of one or many layer of properly oriented fibers (unidirectional,<\/strong> fabric, multiaxial<\/strong> and others), which is appropriately impregnated with the right amount of thermosetting resin in a special machine (the impregnating machine<\/strong>).<\/p>\n <\/p>\n With other systems (for example in filament winding) fiber arrangement, impregnation, and polymerization take place in sequence, in a single production cycle, whereas prepregs are usually produced well in advance<\/strong> with respect to the final polymerization. The name derives from the union of two words: “PRE”<\/strong> is to mean that the semifinished product has been “PRE … pared”<\/strong> in advance “PREG”<\/strong> instead refers to the fact that it has been subjected to the process of “im … PREG \u2026nation”.<\/strong><\/p>\n <\/p>\n Prepregs have contributed greatly to improve the overall performance of the composites industry, in particular thanks to two characteristics:<\/p>\n <\/p>\n We talked of semi-finished product, but in reality things are not in these terms. Very few large composite producers are so large to made internally both the phase of pre-impregnation, and the final stage of production of the composite itself.<\/p>\n <\/p>\n Instead the market is divided into two parts: upstream<\/strong> there are the producers of prepregs<\/strong> which employ fibers and resins to obtain the prepreg. Downstream<\/strong> composite manufacturers<\/strong> purchase prepregs to make the finished composite. For these reasons, in the entire production cycle of the composite prepreg is a semi-finished product, it is a real product, bought and sold in the market if the reality is considered.<\/p>\n <\/p>\n In the opinion of the writer the industry has benefited greatly from this separation, because it has allowed the specialization of operations, with an overall improvement of the composites industry as a whole.<\/p>\n <\/p>\n <\/p>\n <\/p>\nPre Pregs<\/strong><\/span><\/h4>\n
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Pre Pregs Cutting<\/strong><\/span><\/h4>\n