Part 4 of 6: Polyethylene Fundamentals
Injection molders of small fuel tanks learned the hard way that a very small difference in density—0.6%—could make a large difference in PE stress-crack resistance.
#polyolefins #bestpractices
Part 2 The Basics of Tapered Interlocks
When, where, and how to use them.
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Follow These Steps to Purge Accumulator-Head Blow Molders
Preventive purging with a commercial product between resins or colors and during normal shutdown and startup cycles can prevent excessive loss of resin and production time.
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Part 2: How to Prevent Nozzle Tip Leaks
Your very costly mold in that very expensive press is relying on the performance of a $20 nozzle tip that no one ever checks, and has a high probability of not doing its job. Stop learning from your mistakes and start learning how not to make them.
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Part 3 of 6: Fundamentals of Polyethylene
PE parts can fail when an inappropriate density is selected. Let’s look at some examples and examine what happened and why.
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October's Most Popular Articles from Plastics Technology
Customizable 3D-printed prosthetics; new-concept cube molds at the K; fundamentals in PE, extruder alignment and nozzle leaks; benchmarking and more stirred reader interest at PTOnline.com in October.
#kshow #bestpractices
Extruder Alignment: Important, but Only Half the Equation
The other half? Aligning and supporting downstream equipment. Here are best practices.
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Do You Have What It Takes to Be a Top Shop?
Check out the results of our exclusive benchmarking study to find out about those who do.
#bestpractices #topshops #editorial
Exclusive Benchmarking Report: Top Shops Are More Than Just Molders
The 2019 Plastics Technology Top Shops Survey shows that for its highest-rated respondents, injection molding is just one element in a growing suite of services and capabilities offered to customers.
#bestpractices #topshops
Part 1: How to Prevent Nozzle Tip Leaks
Instead of learning from your mistakes, stop making them in the first place.
#bestpractices
V-to-P Ramp Time and Over-Travel
Many injection machines use ramp time to control the transition from injection pressure to hold pressure and reduce over-travel. Do you know how to set yours?
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Understanding Viscosity in Extrusion
Both the power-law coefficient and the consistency index must be considered to calculate viscosity.
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Part 1: The Basics of Tapered Interlocks
Various types of interlocks are available to molders. Here, we discuss the oldest and most common types of interlocks—those with a tapered or angular shutoff.
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Graphing Injection Pressure: What Should Pack & Hold Curves Show?
Are you sure your press is doing what you want? Visit your controller often to ensure your machines plot the pressure vs. time graph for all your processes. Here let’s focus on pack and hold.
#scientificmolding #bestpractices
Molder’s Philosophy of ‘Giving Back’ Helps Attract New Employees
R&D Plastics participates in numerous programs to further plastics education with local universities and high schools. This effort breeds good community relations and helps attract new employees.
#bestpractices #closeupontechnology #business
Using Decompression to Your Advantage—Your Questions Answered
Since the article on decompression has been published, I have received a few questions that I wanted to share with everyone.
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How to Use 'Mapping' to Troubleshoot Blown Film Problems
Three real-world case studies show how processors solved common problems in blown film via the mapping technique.
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Strike the Right Balance in Process Cooling to Improve Product Quality & Profitability
Weigh planning methodology and today’s technology to cost-effectively address your process-cooling needs.
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Part 2: Why Shoulder Bolts are Too Important to Ignore
Follow these tips and tricks for a better design.
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Cooling the Feed Throat and Screw: How Much Water Do You Need?
It’s one of the biggest quandaries in extrusion, as there is little or nothing published to give operators some guidance. So let’s try to shed some light on this trial-and-error process.
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