Know-How
Tracing the History of Polymeric Materials: Polyesters
Beyond PET, PBT and their analogues, development of polyester chemistry led to unsaturated thermosetting resins, copolyester thermoplastic elastomers, liquid-crystal polymers and, most recently, biopolymers.
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Tracing the History of Polymeric Materials: PBT
The slow crystallization of PET polyester made it a poor option for processes like injection molding. This led to the development of more molder-friendly options such as PBT.
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Understanding Fountain Flow in Injection Molding
The phenomenon of fountain flow affects almost every aspect of the molded product — starting with filling, extending to pack and hold, and ultimately manifesting in part defects like bubbles and voids.
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What’s Controlling Your Cycle Time? Part 2
Follow these mold-cooling guidelines to maximize your profits.
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What’s Controlling Your Cycle Time? Part 1
Follow these guidelines to maximize your profits.
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Tracing the History of Polymeric Materials: PET
How PET evolved from a material for fibers and fabrics to a force in packaging.
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Minimize Sheet Gauge Variation by Roll Design
‘Hour-glass’ sheet gauge can be avoided through a reverse-bending roll design that is out of patent and freely available.
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How to Stop Melt Leakage and Carriage Blow-Back
Follow these tips when you have melt leakage around the machine nozzle and sprue bushing or injection-carriage blow-back.
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Tracing the History of Polymeric Materials: How Nylons & Polyesters Connected
The history of nylons and polyesters are intertwined, and it takes some knowledge of chemistry to understand why.
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How Does Your Molding Machine Control Pack Pressure?
It seems some new machines have pack velocity issues, as machine builders are confusing processors with controllers that are more complicated than they need to be and less user-friendly.
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