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Term |
Definition |
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MA
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Maleic anhydride
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Macerate
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(v) to chop or shread fabric for use as a filler for a moulding resin. (n) The moulding compound obtained when so filled.
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Machine Shot Capacity
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Refers to the maximum weight of thermoplastic resin which can be displaced or injected by the injection ram in a single stroke.
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Macromolecule
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The large giant molecules which make up the high polymers.
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Mandrel
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(1) The core around which paper, fabric, or resin-impregnated fibrous glass is wound to form pipes or tubes (2) In extrusion, the central finger of a pipe or tubing die.
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Manifold
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A term used mainly with reference to blow moulding and sometimes with injection moulding equipment. It refers to the distribution or piping system which takes the single channel flow output of the extruder or injection cylinder and divides it to feed several blow moulding heads or injection nozzles.
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MAP
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Manufacturing Automation Protocol
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Masterbatch
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A plastics compound which includes a high concentration of an additive or additives. Masterbatches are designed for use in appropriate quantities with the basic resin or mix so that the correct end concentration is achieved. For example, colour masterbatches for a variety of plastics are extensively used as they provide a clean and convenient method of obtaining accurate colour shades.
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Mat
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A randomly distributed felt of glass fibers used in reinforced plastics lay-up moulding.
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Matched Metal Moulding
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Method of moulding reinforced plastics between two close-fitting metal moulds mounted in a hydraulic press.
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Material Well
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Space provided in a compression or transfer mould to care for bulk factor.
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Matrix Material
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Material that binds the fibres
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MBS
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Methacrylate-butadiene-styrene
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MC
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Methyl cellulose
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MDPE
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Medium density polyethylene
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Melamine-Formaldehyde
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This plastic is a member of the amino family (which also includes urea) and is probably best known to the public as colorful, rugged dinnerware. However, it also finds use in many household goods, in various electrical applications, and in bonding, adhesives and coatings. products. Melamines offer extreme hardness, excellent colorability and arc-resistant nontracking characteristics. Thermosetting resins formed by the condensation reaction of formaldehyde [HCHO] and melamine [C3N3(NH2)3]. The chemistry is analogous to that of ureaformaldehyde except that the three amino groups of melamine provide more possibilities for cross-linking, are more highly reactive, and all six hydrogen atoms of melamine will react, forming the hexamethyl compound.
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Melt
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(1) Plastic material in a molten condition. (2) Molten moulding compound
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Melt Channel
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The channel in a barrier screw designed to collect and convey forward the melted polymer.
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Melt Expansion
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Refers to the fact that all plastics expand when they are melted--the same weight of a given material takes up more space. The exact degree to which the volume expands is unique to each plastic material. Said another way, a plastic's solid density is greater than its melt density.
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Melt Extractor
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Usually refers to a type of injection machine torpedo but could refer to any type of device which is placed in a plasticating system for the purpose of separating fully plasticated melt from partially molten pellets and material. It thus insures a fully plasticated discharge of melt from the plasticating system.
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