Reaction injection molding

Reaction injection molding Reaction injection molding is also called liquid injection molding, high pressure impingement molding and reaction liquid impingement molding with acronyms RIM, LIM and RUM. These systems are now being used for shoe components, furniture, industrial parts and automobile body components, etc. In this process, the two components of a resin such as …

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Product Eject from the Undercut Core

  How Product Eject from the Undercut Core? Are there any raised portions inside the product that would be molded in severe undercuts in the core and prevent the product from being ejected easily?   (1) Snap. A frequently used undercut is a snap feature, which is a (usually circular) rim inside the product, shaped to …

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Mold Drawings

Mold Drawings Assembly and Detail Drawings The purpose of the assembly drawing (including the Bill of Materials discussed later) is to convey the intentions of the designer to the people involved in purchasing hardware and materials, assembling the    mold,    and, finally,    operating the mold.    The assembly drawing of the    mold    must    contain    all    pertinent information, …

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Mold Base

Mold Base   A mold base (sometimes also called “chase”)is the total of all mold plates making up the mold, including screws and alignment features, but not including the stack, which is the arrangement of all mold parts that touch the injected plastic, typically, the cavities, cores, any inserts in either of them, ejectors, strippers, …

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Electrochemical Material Removal-Etching

Electrochemical Material Removal-Etching For decorative or functional purposes, a surface is very often textured This is either done for cosmetic reasons, for obtaining a more scratch and wear resistant surface (e.g. leather or wood grain) or a better hand. Flow marks (weld lines,streaking) can be hidden, too. The previous,mostly mechanical and predominantly manual, procedures often …

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Casting Methods and Cast Alloys

Casting Methods and Cast Alloys Of the numerous casting methods available, variants of sand casting and precision casting are used to make mold inserts. The choice of casting method depends on the dimensions of the mold, the specified dimensional tolerances, the desired faithfulness of reproduction and the requisite surface quality. After casting, the mold essentially …

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Material Applications,Material Drying

Material Applications Some of the main groups of polymers are identified below, with an indication of how these are used within the industry.    Acrylics:Automotive lights, control knobs, dials and handles, meter cases, lenses, pens and pencils, hospital equipment, display material, signs, light fittings, inspection panel covers, windscreens, machine guards, skylights, some telephones, sanitary ware.    Acrylonitriles:Butadiene …

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