Know-How
MATERIALS: The Problems With Single-Point Data
Polymer properties are not constant as a function of temperature, and even small temperature changes can affect properties.
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RECYCLING: Compatibilizers Create New Recycle Feedstream Value
Generally confined to prime material applications, these additives are helping recyclers improve yields of mixed-material bales.
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TOOLING: How to Vent Mold Details
Principles to follow in venting bosses, ribs, pins, cores, slides, and lifters.
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EXTRUSION: Another Technique for Controlling Melt Temperature
Flight widths are almost always designed at 10% of the screw diameter. But they can be optimized to reduce melt temperature and perhaps boost output.
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INJECTION MOLDING: How to Specify an Injection Molding Machine
In part two of a three-part series, the focus is on the injection unit.
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MATERIALS: The Problems with Single-Point Data
Engineers who are used to working with metals are surprised that plastics cannot operate as close to their yield points as can metals. The yield point is not enough to tell you how the material reacts to stress.
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TOOLING: Venting: Where And How Deep?
After last month’s introduction to the subject, let’s get into the details on vent depths, land lengths, and the alternatives to perimeter venting.
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EXTRUSION: Cooling: The Critical Function in Extrusion
Figuring out how much cooling your process needs is complicated. But there are ways to approximate.
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INJECTION MOLDING: How to Specify an Injection Molding Machine
With the market percolating, more molders are looking at new presses. This series will discuss what you should consider before writing a check, beginning with the clamping unit.
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MATERIALS: The Problems with Single-Point Data
Properties are generally provided at a single temperature on a data sheet. But do those properties stay the same with changing temperatures? Of course not.
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