Plasticizing Resource Library
The most complete catalog of plastic processing resources!
At SpiraMelt, we are dedicated to advancing the Injection Molding and Plastic Extursion Industry through education, development, and the implementation of the most important aspects of plastics processing – feed screw and melt stream technology!
How Do Barrier Screws Work?
Exploring the melting mechanism of a basic barrier screw compared to that of a conventional screw is important for all resin processors. It is likely that your company has an application that could greatly benefit from a more optimized screw design.
Peripheral Screw Speed vs. RPM
Peripheral Screw Speed vs. RPM There are plenty of abundantly obvious differences between small and large screws, whether we were to compare injection molding or extrusion applications. However, beyond the physical differences in geometry and design approach, there is one important factor that is rarely understood or considered – peripheral screw speed. Primary Melting Mechanisms
Volatile Removal in Vented Extrusion
Without adequate equipment and operating conditions, insufficient degassing, contamination, and even vent flooding will occur. These downfalls can be very costly and in the case of vent flooding, very labor intensive to remedy.
Melting Mechanisms Inside Your Barrel
The majority of plastics processors, in both the extrusion and injection molding sectors, rarely understand the melting mechanisms within the barrel, and more specifically, within the screw channels.
Color Swirls and What to Do About it
Total output or cycle time is critical, however, if part quality is sacrificed in the pursuit of high throughput, there is little opportunity for successful molding – especially in a competitive global marketplace.
“General Purpose Screw Designs” and Their Short-Comings
Universal, or General Purpose screw designs are more or less the standard modus operandi in resin processing – particularly in the injection molding sector. In theory, this sounds like the ultimate solution to the ultimate problem, however the possibility of such a design is relatively impossible from polymer to polymer
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Explore More Plastic Resources
How Do Barrier Screws Work?
Exploring the melting mechanism of a basic barrier screw compared to that of a conventional screw is important for all resin processors. It is likely that your company has an application that could greatly benefit from a more optimized screw design.
Peripheral Screw Speed vs. RPM
Peripheral Screw Speed vs. RPM There are plenty of abundantly obvious differences between small and large screws, whether we were to compare injection molding or extrusion applications. However, beyond the physical differences in geometry and design approach, there is one important factor that is rarely understood or considered – peripheral screw speed. Primary Melting Mechanisms
Volatile Removal in Vented Extrusion
Without adequate equipment and operating conditions, insufficient degassing, contamination, and even vent flooding will occur. These downfalls can be very costly and in the case of vent flooding, very labor intensive to remedy.
Is Your Screw Tip Leaking?
The screw and valve is the heart of any injection molding operation and more than any other component can determine the overall part quality, and have a major influence on profitability. Many, if not most, injection molding firms do not fully understand non-return valve design.
Are You Overpacking Your Parts?
Rarely are molded parts routinely measured for weight variation from part-to-part. After all, the purpose is to fill and pack the mold. If the final molded part passes basic quality stipulations, then why dwell on the finer details? This molding philosophy is a complete disaster in countless ways, and may very well be an even larger problem than we are fully aware. Let’s explore.
What is Solid-Bed-Break-Up?
Whether we are interested in a single screw extruder, or an injection molding machine, solid-bed-break-up is a phenomenon that is important for resin processors to understand. With all conventional screws, solid-bed-break-up is present and likely a major source of melt quality concerns.
“General Purpose Screw Designs” and Their Short-Comings
Universal, or General Purpose screw designs are more or less the standard modus operandi in resin processing – particularly in the injection molding sector. In theory, this sounds like the ultimate solution to the ultimate problem, however the possibility of such a design is relatively impossible from polymer to polymer
Color Swirls and What to Do About it
Total output or cycle time is critical, however, if part quality is sacrificed in the pursuit of high throughput, there is little opportunity for successful molding – especially in a competitive global marketplace.
Melting Mechanisms Inside Your Barrel
The majority of plastics processors, in both the extrusion and injection molding sectors, rarely understand the melting mechanisms within the barrel, and more specifically, within the screw channels.
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