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From the bottom to the top. At full flow, either direction is satisfactory. However, if reduced volume is required, then bottom-to-top keeps the water channels full, minimizing hot spots resulting from areas of the tool that are not properly
cooled.
-R. Hollowell, Past Chairman, SPE Moldmaking & Mold Design Div.
Square part: across the width. Rectangular part: across the
length.
-K. Poehlmann, Gecamex, Leamington, ON, (519) 326-6113.
Some suppliers have great literature on this subject; use them! LNP just published a processing guide; there are many others. Here's a quote from it: "A properly designed mold cooling system will effectively remove heat from the corners of the box to maintain a uniform overall mold temperature. [To] preferentially cool hotter areas, [move the] cooling channels closer to the hotter areas of the cavity-corners, thick
sections."
-M. Thompson, Glenn Beall Engineering, Gurnee, IL, (708) 367-5353.
Ideally the shortest run will maintain the least temperature rise from in to out, and maintain a uniform cavity / core. It is best not to loop lines; also, stagger in and out supply: top (1) in, top (2) out, top (3) in, and so
forth.
-W. Mulholland, Lasko Metal Products, Ft. Worth, TX, (817) 625-6381.
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