Brogaard Kaas posted an update 1 year, 3 months ago
Resins… Film thickness… Tensile strength… Impact resistance… So what can these terms mean to you personally when selecting your polyethylene bags?
If you aren’t a poly salesman and have a qualification in Plastics Engineering, the terminology found in the industry probably makes your head spin. To help you, we’ve created Polyethylene Packaging 101.
Resins (Understood to be: Some of numerous physically similar polymerized synthetics or chemically modified natural resins including thermoplastic materials like polyvinyl, polystyrene, and polyethylene and thermosetting materials including polyesters, epoxies, and silicones which can be used with fillers, stabilizers, pigments, and other components to make plastics.)
It may seem overwhelming with all the current different resins available. How does one choose if you have octene, metalocene, butene, hexene, etc… A qualified sales rep should be able to help know what grade to use. Each grade has different characteristics and choices must be determined by applications. Understanding resin properties is very important in formulating the right product on your specific application.
Film Thickness (Gauge)
Polyethylene film thickness is measured by thousandths inch, or milli-inch. The thickness of the bag doesn’t always correlate into strength. A whopping gauge bag might not be strong. Generally it is just a mixture of resin grade and gauge relative to the applying. A two mil octene linear bag can have more strength than a 2 mil butene linear.
Tensile Strength vs. Impact Resistance
Tensile strength is the maximum stress a material can withstand while being stretched or pulled before breaking. Why so much interest?
You need to have a very plastic bag that is certainly sufficiently strong to your application. A plastic bag that holds 50 pounds of material must have adequate tensile strength, otherwise the bag can be breaking.
Impact resistance is often a material’s ability to resist shock loading. What does this imply?
Basically it does not take film’s capability to resist being punctured. A punctured bag may result in contaminated goods or product loss.
When choosing the proper gauge and resin formula it is important to consider how tensile strength and impact resistance are relevant to your packaging application. An example that everybody can relate to is a garbage bag. I’m sure most have had failure in a garbage bag whether or not it breaks when lifting out of your can (tensile strength) or waste material punctures holes within it (impact resistance). With all of these variables in choosing the correct formula for your polyethylene package, having a knowledgeable salesman is critical.
Isn’t there was so much to learn about making Polyethylene "Film and Bags"!?!
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