Parkinson Technologies

Evolution of the Lay-on Roller

Today’s web converters are challenged with production requirements that are becoming increasingly difficult to satisfy with the technology of their older slitter rewinder equipment.Roll quality standards are harder to achieve as materials being processed are thinner, have lower modulus and have either very high or very low coefficients of friction, or when production speeds and finished roll sizes continue to increase. One area where we have seen gains being made is the development of improved lay-on roller systems that help address these process challenges.

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Screen Changer; Screen Usage in a Timed Cycle Mode

We frequently justify the screen roll cost against the standard square mesh filter packs used in slide plate machines. When a roll of screen can cost $1,000 or more depending on the size, it inevitably attracts the attention of purchasing departments. But when you break down the screen cost as a function of the pounds of product processed through the filter, it becomes clear that screen cost is insignificant.

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Screen Changer; Timed vs Pressure Control Screen Movements

Pressure change vs. timed movements. In the world of continuous belt screen changers, this has long been a topic for discussion. Many processors just set the machine up in pressure control mode and let it do its thing. But that isn’t the best way to run this style of machine. Here’s why.

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3 Key Specs to Communicate to Your Machine Builder

You’ve chosen a manufacturer for your new web handling equipment, and you’re eager to get started with the process. But, before you move forward, there’s one important part of the project that cannot be overlooked: communicating exactly how your machine will be used, and your expectations of its performance.

There are three types of specifications your machine builder must know before they can accurately build a custom-engineered or even a standard machine: 

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A Good Winder Won’t Necessarily Fix a Bad Web

While it’s natural for processors to blame the winder when defects appear in roll goods, more often than not the root cause of the problem can be traced to the process upstream.

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Differential vs. Locked-Core Rewinding

There is often some confusion as to what type of rewinding method is appropriate for certain slitter rewinder applications. To shed some light on the topic, we’ve put together a quick overview on the differential versus locked-core method below.

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Why an RDW Filter is Essential to Optimizing Screen Changer Performance

Automatic, ribbon-style continuous belt screen changers used in plastics extrusion require long filter belts that pass through the filter chamber. These belts are made up of high-tensile, stainless steel wire woven into a mesh. While it may be tempting to use lower-priced, plain-weave wire cloth filters, the reality is that these lack strength and can fail over time. The better bet? Consider using a reverse Dutch twill weave (RDW) filter belt, which is specially engineered to provide added strength and durability required for continuous belt screen changer operation.

What Exactly is RDW?

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PID Control Loops used in Extrusion Applications

Many of us in the extrusion industry have heard of PID control loops, but do we fully understand the causes and effects PID control loops can have on the extrusion operation?

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Center Surface Slitter Rewinders; a Machine with the Highest Level of Flexibility

When faced with the decision of what slitter rewinder to consider to process the growing variety of materials used today, the center surface slitter rewinder is the go-to choice.

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Extend the Life of Your Older Converting Equipment (And Enhance Production, Too)

That slitter rewinder you bought 40 years ago has been pretty good to you overall. But more recently there have been warning signs: glitches, worn-out parts needing replacement, and performance that’s not quite measuring up. If this scenario sounds familiar, it may be time for an upgrade. 

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When It Comes to Product Trials, Unexpected Results Can Be a Good Thing

Every “failure” is a learning process that breeds smarter decisions going forward.

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Slitting Techniques: A Basic Guide

Slitter rewinder machines use three types of slitting methods to cut material: razor blade, shear cut, and score cut. The most appropriate slitting technique to use depends on a variety of factors, such as the type and thickness of the materials being processed. With well over a century of combined manufacturing expertise in Dusenbery converting systems, we've gained valuable insight into the use of slitter rewinders. This article is based on our hands-on experience and explains, on a very basic level, which slitting methods are suitable for various applications.

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3D Printing is Changing the Game for Manufacturers

Although it may sound futuristic, 3D printing is here—and it’s here to stay. 3D printing has steadily impacted how manufacturers do business, and Parkinson Technologies is no exception. There are two ways Parkinson uses 3D printing: for prototyping and for creating small functional components for our machinery. Learn more about the real-world examples Parkinson Technologies utilizes this 3D printing technology.

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Manufacturing: Land of Opportunity for Young Workers

At Parkinson Technologies, we believe the key to inspiring fresh interest in manufacturing careers is education. We’re doing our part to let younger generations know that manufacturing is about more than pulling levers on an assembly line.

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Sequential vs. Simultaneous Biaxial Film Stretching: What’s the Difference?

When it comes to producing biaxially oriented films, most are familiar with the well-proven sequential stretching method, which is used in the production of the vast majority of biaxially oriented film and sheet products. However, there is another, less common technique that’s ideal for certain plastic film and sheet applications, particularly if the material does not tolerate sequential stretching in separate steps or must have exceptional optical properties.

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Surface or Center Winder: Which is best for Your Application?

Selecting the right winder for your web production line is essential to consistently producing high-quality rolls that are free of defects. But when it comes to choosing the best machine for the job, what do you need to consider?

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Preparing for a Successful Trial at our Plastics Extrusion & Orientation Pilot Lab

At its main facility in Woonsocket, Rhode Island, Parkinson Technologies maintains a versatile pilot line with extrusion-casting & orientation capabilities, which we refer to as the pilot lab (also known as the BIAX Lab). If you've never done a trial in our lab before, there are a few things you should know in order to be prepared for a successful run.

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Continuous Screen Changers 101

Are you familiar with the term “continuous screen changer,” but not exactly sure what it is? A continuous screen changer is a machine that filters out impurities in the polymer extrusion process—without interrupting the process when a dirty screen needs to be changed. It’s used in melt filtration processes where debris can clog up screens in a very short time and process disruptions are costly. Markets and extrusion processes that employ continuous screen changers include pipe and profile, film and sheet, compounding, resin production, blow molding, nonwovens, and specialty material.

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Slitter Rewinder: Top-Riding Rolls

In many production facilities today, high-speed converting is essential for greater productivity. Unfortunately, high speeds can also be counterproductive because roll quality can suffer. At higher speeds, air is entrapped between the incoming web and the surface of the roll, resulting in air pockets and bubbles that allow the roll layers to shift against each other. The industry’s answer to this problem is the top-riding roll, a welcome refinement to winder and slitter rewinder applications. 

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Plastics Orientation: The How and the Why

Although the number of processors manufacturing oriented plastic films represents only a small fraction of those involved in the massive plastics industry as a whole, the volume of material processed is significant, and oriented films are vital high-value components in the manufacturing of many everyday products such as food packaging, battery separators, easy-tear pouches, and more.

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