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VIEW ALLThe Fundamentals of Polyethylene – Part 2: Density and Molecular Weight
PE properties can be adjusted either by changing the molecular weight or by altering the density. While this increases the possible combinations of properties, it also requires that the specification for the material be precise.
Read MoreUnderstanding the Effect of Pressure Losses on Injection Molded Parts
The compressibility of plastics as a class of materials means the pressure punched into the machine control and the pressure the melt experiences at the end of fill within the mold will be very different. What does this difference mean for process consistency and part quality?
Read MoreThe Fundamentals of Polyethylene – Part 1: The Basics
You would think we’d know all there is to know about a material that was commercialized 80 years ago. Not so for polyethylene. Let’s start by brushing up on the basics.
Read MoreHow to Start a Hot-Runner Mold That Has No Tip Insulators
Here's a method to assist with efficient dark-to-light color changes on hot-runner systems that are hot-tipped.
Read MoreMaximize the Cooling Capacity of Your Extrusion Line
Maximizing output in extrusion requires a thorough understanding of not only the cooling requirements of the extruder but of the extrudate as well.
Read MoreHow Polymer Melts in Single-Screw Extruders
Understanding how polymer melts in a single-screw extruder could help you optimize your screw design to eliminate defect-causing solid polymer fragments.
Read MoreLatest Know How News And Updates
Solving Issues with Gloss
Your problem may be related to tooling, material, processing, or combinations thereof. Here’s how to find the root cause.
Read MoreEXTRUSION: Melting 101
Learn the basics on how polymer melts in a single screw. Barrel temperature plays less of a role than you might think.
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Unraveling the Science and Myth Associated With Moisture Analysis— Part 1
The first task in moisture measurement is to purchase an instrument that is based on sound fundamentals. Then, before it goes into use, method development must be undertaken for all polymers that are going to be processed in the plant.
Read MoreImprove Production Rates Via Screw Design — Barrier vs. General Purpose vs. Melt Uniformity
I’m looking for a few good molders to help trial a new screw design, and share data and results for a future article to prove the benefits of a melt uniformity screw.
Read MoreHow to Design Three-Plate Molds – Part 3
There are many things to consider, and paying attention to the details can help avoid machine downtime and higher maintenance costs — and keep the customer happy.
Read MoreIs a Gear Pump Right for Your Single-Screw Operation
As with everything else, there are pros and cons, but more of the former. They provide processors higher rates while decreasing the temperature of the extrudate while enabling downgauging.
Read MoreThe Experience Curve and Well-Trained Process Technicians
Pairing external big picture training with internal job-specific instruction can help your process technicians meet quality expectations as well as production targets.
Read MoreThe Fantasy and Reality of Raw Material Shelf Life: Part 2
For the vast majority of thermoplastics, the stability of the materials can be stated in years, not months. But there are exceptions where shelf life can be a serious issue.
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