Injection Know How

Bulk, Solid and Melt Density: How to Calculate These Values and Why They Matter — Part 1 of 2
Injection Know How

Bulk, Solid and Melt Density: How to Calculate These Values and Why They Matter — Part 1 of 2

How much resin is contained within a bucket, gaylord or hopper? That depends on the bulk density — a figure you need to learn how to calculate due to its impact on everything from storage and conveying to drying and molding.

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Important Factors and Approaches to Estimating Residence Time in Injection Molding

Residence time can have a dramatic impact on part quality and production efficiency but determining its value can be tricky. Use these methods and formulas to accurately measure residence time and enable it to inform everything from scheduling jobs to optimizing a process.

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A Systematic Approach to Process Development

The path to a no-baby-sitting injection molding process is paved with data and can be found by following certain steps.

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Get the Most From Fiber-Reinforced Thermoplastic Composites Parts

There are five specific areas that designers and manufacturers need to consider to realize the potential of these unique materials.

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Three Key Decisions for an Optimal Ejection System

When determining the best ejection option for a tool, molders must consider the ejector’s surface area, location and style.

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Starting or Restarting an Injection Molding Machine — What Works Best?

Successfully starting or restarting an injection molding machine is less about ticking boxes on a rote checklist and more about individually assessing each processing scenario and its unique variables.

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Home In on These Six Variables to Monitor Molding

There are hundreds of variables in molding, but focusing on these six will help you make consistent parts.  

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Injection Molding: Focus on these Seven Areas to Set a Preventive Maintenance Schedule

Performing fundamental maintenance inspections frequently assures press longevity and process stability. Here’s a checklist to help you stay on top of seven key systems.

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Using Data to Pinpoint Cosmetic Defect Causes in Injection Molded Parts

Taking a step back and identifying the root cause of a cosmetic flaw can help molders focus on what corrective actions need to be taken.

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Revisiting the '5 M's' of Molding

All injection molding ultimately comes down to the “Man, Mold, Machine, Material and Method.” But those key aspects can be viewed differently if you’re auditing mold changes before startup or troubleshooting changes for an already validated process.

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Attending NPE2024 From the Perspective of a Molder

NPE2024 has come and gone, but before it’s completely in our collective rearview, Plastics Technology asked Rodney Davenport, vice president at injection molder CH3 Solutions, for a processor’s perspective on the big show.

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Use These 7 Parameters to Unravel the Melt Temperature Mystery

Despite its integral role in a stable process and consistent parts, true melt temperature in injection molding can be an enigma. Learning more about these seven parameters may help you solve the puzzle.

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Diagnosing Defects: Determine True Root Cause Before Adjusting a Process

Common defects can have common causes — flash equals worn mold shutoffs, right? Except when they don’t. Trust your eyes, but verify the root cause before adjusting a process.  

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