Industry News • Paul Murphy Plastics

Extruder-Screw.jpg

February 5, 2019

I teach a one-day Intro to Extrusion seminar, and many of my participants are new to extrusion. Therefore, I explain the basic principles of screws for thermoplastics. That’s good for the newbies, but sometimes I get more experienced extrusion people thanking me for these basics, which they had never learned way back when. So here goes. I hope you all find it useful.

The screw is a conveyor. As it turns, it tries to screw itself backward out of the barrel, but a bearing keeps it from going out the back. Because every action has a reaction—remember Isaac Newton?—it pushes the other way, too, in the forward direction, and that’s what pushes the material out of the die.

Material needs to get soft to go through the die. Any thermoplastic will get soft and moldable (plastic) with heat (thermo). The feed is sometimes preheated (usually for drying), but it gets most of the heat from internal friction as it moves against the barrel walls and screw surfaces. The clearances from flights to barrel are where most heat is generated. Exceptions: Some twin screws, small machines, high-temp resins and PE coatings, where barrel heat is important, too.

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Plastic-Testing.jpg

February 5, 2019

The term ‘plastics’ is used to describe a variety of synthetic and natural compounds, and many plastic variants are used in different products and industries.

Plastics can contain an assortment of reinforcing materials and fillers additives. The combination of these products along with the manufacturing process can significantly affect the mechanical properties of the finished product. Industries such as automotive engineering and aerospace have a huge demand for advanced plastics, making it imperative to assess and monitor the performance of such materials.

Testometric’s precision testing system has invaluable capabilities that help ensure that the selected material has the performance and characteristics to fulfill the necessary specification for the specific product or component. Packages are provided to cover the entire range of plastic materials. These comprise of grips, software, and other accessories for all test protocols covering compression, shear, creep, tensile, tear, flexural, puncture, peel, ring stiffness, friction, adhesion, hardness, etc.

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Drive-Flow.jpg

February 5, 2019

Molecular orientation occurs when melted polymer is sheared or stretched. If cooled quickly, this orientation is largely retained until the extrudate is reheated to a temperature that allows the molecular chains to move to their relaxed state.

Orientation can be beneficial or troublesome. It can be desirable when it is deliberately added to the extrudate. For example, it provides property improvements such as unidirectional strength in fibers, hoop strength in oriented extrusion blow molded bottles, and tear strength in oriented films. But in many extruded parts orientation can cause post-extrusion problems from non-uniform shrinkage and warpage.

Orientation occurs in every extrusion process due to the inherent strain applied to the long-chain molecules as the polymer is shaped and flows through the die. Some orientation through the die is unavoidable, and the magnitude depends on output rate for a given die design. A secondary annealing process is about the only way to reduce all orientation in extruded parts.

Polymer orientation can be measured for transparent polymers in the amorphous state by birefringence, and in both the amorphous and semi-crystalline state by infrared spectroscopy. The simple field test for orientation, often referred to as the “Chrysler test,” calls for cutting

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Plastic-Applications.jpg

February 5, 2019

By far the lowest-cost global producer, the North American polyethylene resin industry has been booming for the last few years, with a new supply of commodity grades brought on stream and more to come—often through partnerships that complement or enhance each other’s technologies. At the same time, specialty, higher-performance grades have been developed to meet major market trends, which include sustainability, consumer convenience, and evolving E-commerce packaging needs.

Key sources from three leading PE suppliers weighed in on these trends and discussed the half-dozen or so growth applications and the new materials developed within the last three-five years to meet their needs. These sources included are Olivier Lorge, global market development manager at ExxonMobil Chemical; Chris Foy, leader of PE R&D, and Alan Schrob, market group leader, of Nova Chemicals; and Louis Orozco Aragon, technical service & technology manager at Braskem.

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Plastic-Extrusions.jpg

February 5, 2019

Global Plastics Extrusion Market Research Report 2019 aides, as a rule, Plastics Extrusion inconspicuous components including the latest examples, Plastics Extrusion market status, and factors driving the improvement. A particular analysis of key Plastics Extrusion market players, stock system research, strategies for market gave in this report. Different elements like Plastics Extrusion improvement status, regard chain study, and Plastics Extrusion industry view structure are offered in this report. The check analysis related to global Plastics Extrusion industry is distributed out in this report.

In 2019, the global Plastics Extrusion market valuation ratio was xx million US and it is expected to gain XX million US before the end of 2025, with a CAGR of xx.x % around in the capacity of 2019 and 2025.

Top Key Players of Plastics Extrusion Market:

Talent Plastics Intek Plastics American Extruded Plastics General Plastic Extrusions Keller Products Inc. Tatra Rotalac Apex Plastics

Research Type by Plastics Extrusion Market:

Blown Film Extrusion Sheet/film Extrusion Tubing Extrusion Over Jacketing Extrusion Coextrusion Extrusion Coating

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