#BESTPRACTICES

Commodity Resins

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

Molds & Tooling

Part 2 The Basics of Tapered Interlocks

When, where, and how to use them.
#bestpractices

Purging Compounds

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.
#bestpractices #technologyinaction

Know How

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.  
#bestpractices

Commodity Resins

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.
#polyolefins #bestpractices

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

Extrusion Know How

Extruder Alignment: Important, but Only Half the Equation

The other half? Aligning and supporting downstream equipment. Here are best practices.
#bestpractices

Injection Molding

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

Injection Molding

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

Know How

Part 1: How to Prevent Nozzle Tip Leaks

Instead of learning from your mistakes, stop making them in the first place. 
#bestpractices

Injection Know How

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?
#bestpractices

Sheet Extrusion

Understanding Viscosity in Extrusion

Both the power-law coefficient and the consistency index must be considered to calculate viscosity.
#bestpractices

Molds & Tooling

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.
#bestpractices

Injection Molding

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

Injection Molding

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

Injection Molding

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.
#bestpractices

Film Extrusion

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.
#bestpractices #technologyinaction

Heating & Cooling

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.
#bestpractices #technologyinaction

Know How

Part 2: Why Shoulder Bolts are Too Important to Ignore

Follow these tips and tricks for a better design.
#bestpractices

Heating & Cooling

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.
#bestpractices