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- Compression_molding abstract "Compression molding is a method of molding in which the molding material, generally preheated, is first placed in an open, heated mold cavity. The mold is closed with a top force or plug member, pressure is applied to force the material into contact with all mold areas, while heat and pressure are maintained until the molding material has cured. The process employs thermosetting resins in a partially cured stage, either in the form of granules, putty-like masses, or preforms. Compression molding is a high-volume, high-pressure method suitable for molding complex, high-strength fiberglass reinforcements. Advanced composite thermoplastics can also be compression molded with unidirectional tapes, woven fabrics, randomly oriented fiber mat or chopped strand. The advantage of compression molding is its ability to mold large, fairly intricate parts. Also, it is one of the lowest cost molding methods compared with other methods such as transfer molding and injection molding; moreover it wastes relatively little material, giving it an advantage when working with expensive compounds. However, compression molding often provides poor product consistency and difficulty in controlling flashing, and it is not suitable for some types of parts. Fewer knit lines are produced and a smaller amount of fiber-length degradation is noticeable when compared to injection molding. Compression-molding is also suitable for ultra-large basic shape production in sizes beyond the capacity of extrusion techniques. Materials that are typically manufactured through compression molding include: Polyester fiberglass resin systems (SMC/BMC), Torlon, Vespel, Poly(p-phenylene sulfide) (PPS), and many grades of PEEK.Compression molding was first developed to manufacture composite parts for metal replacement applications, compression molding is typically used to make larger flat or moderately curved parts. This method of molding is greatly used in manufacturing automotive parts such as hoods, fenders, scoops, spoilers, as well as smaller more intricate parts. The material to be molded is positioned in the mold cavity and the heated platens are closed by a hydraulic ram. Bulk molding compound (BMC) or sheet molding compound (SMC), are conformed to the mold form by the applied pressure and heated until the curing reaction occurs. SMC feed material usually is cut to conform to the surface area of the mold. The mold is then cooled and the part removed.Materials may be loaded into the mold either in the form of pellets or sheet, or the mold may be loaded from a plasticating extruder. Materials are heated above their melting points, formed and cooled. The more evenly the feed material is distributed over the mold surface, the less flow orientation occurs during the compression stage.Thermoplastic matrices are commonplace in mass production industries. One significant example are automotive applications where the leading technologies are long fibre reinforced thermoplastics (LFT) and glass fiber mat reinforced thermoplastics (GMT).In compression molding there are six important considerations that an engineer should bear in mind:Determining the proper amount of material.Determining the minimum amount of energy required to heat the material. Determining the minimum time required to heat the material. Determining the appropriate heating technique.Predicting the required force, to ensure that shot attains the proper shape.Designing the mold for rapid cooling after the material has been compressed into the mold.↑".
- Compression_molding thumbnail Compression_molding.svg?width=300.
- Compression_molding wikiPageID "1898924".
- Compression_molding wikiPageLength "7240".
- Compression_molding wikiPageOutDegree "19".
- Compression_molding wikiPageRevisionID "675810312".
- Compression_molding wikiPageWikiLink Category:Molding_processes.
- Compression_molding wikiPageWikiLink Fiberglass.
- Compression_molding wikiPageWikiLink Flash_(manufacturing).
- Compression_molding wikiPageWikiLink Heat.
- Compression_molding wikiPageWikiLink Injection_moulding.
- Compression_molding wikiPageWikiLink Matrix_molding.
- Compression_molding wikiPageWikiLink Mold.
- Compression_molding wikiPageWikiLink Molding_(process).
- Compression_molding wikiPageWikiLink PEEK.
- Compression_molding wikiPageWikiLink Poly(p-phenylene_sulfide).
- Compression_molding wikiPageWikiLink Polyamide-imide.
- Compression_molding wikiPageWikiLink Pressure.
- Compression_molding wikiPageWikiLink Putty.
- Compression_molding wikiPageWikiLink Resin.
- Compression_molding wikiPageWikiLink Thermoplastic.
- Compression_molding wikiPageWikiLink Transfer_molding.
- Compression_molding wikiPageWikiLink Vespel.
- Compression_molding wikiPageWikiLink File:Compression_molding.svg.
- Compression_molding wikiPageWikiLink File:Rubber_boots.jpg.
- Compression_molding wikiPageWikiLinkText "Compression molding".
- Compression_molding wikiPageWikiLinkText "compression mold".
- Compression_molding wikiPageWikiLinkText "compression molding".
- Compression_molding wikiPageWikiLinkText "compression".
- Compression_molding wikiPageWikiLinkText "compression-moulded".
- Compression_molding wikiPageUsesTemplate Template:Citation_needed.
- Compression_molding wikiPageUsesTemplate Template:Cn.
- Compression_molding wikiPageUsesTemplate Template:Reflist.
- Compression_molding subject Category:Molding_processes.
- Compression_molding hypernym Method.
- Compression_molding type Software.
- Compression_molding type Industry.
- Compression_molding comment "Compression molding is a method of molding in which the molding material, generally preheated, is first placed in an open, heated mold cavity. The mold is closed with a top force or plug member, pressure is applied to force the material into contact with all mold areas, while heat and pressure are maintained until the molding material has cured. The process employs thermosetting resins in a partially cured stage, either in the form of granules, putty-like masses, or preforms.".
- Compression_molding label "Compression molding".
- Compression_molding sameAs Q940262.
- Compression_molding sameAs Formpressen.
- Compression_molding sameAs Moldeo_por_compresión.
- Compression_molding sameAs Moulage_par_compression.
- Compression_molding sameAs m.064qg8.
- Compression_molding sameAs Formpressning.
- Compression_molding sameAs Q940262.
- Compression_molding wasDerivedFrom Compression_molding?oldid=675810312.
- Compression_molding depiction Compression_molding.svg.
- Compression_molding isPrimaryTopicOf Compression_molding.