Brogaard Williamson posted an update 3 months, 2 weeks ago
Resins… Film thickness… Tensile strength… Impact resistance… What do most of these terms mean for you when purchasing your polyethylene bags?
Unless you are a poly salesman or have a diploma in Plastics Engineering, the terminology utilized in the industry probably makes your mind spin. To help you, we’ve created Polyethylene Packaging 101.
Resins (Defined as: Any one of numerous physically similar polymerized synthetics or chemically modified natural resins including thermoplastic materials for example polyvinyl, polystyrene, and polyethylene and thermosetting materials including polyesters, epoxies, and silicones that are used in combination with fillers, stabilizers, pigments, along with other components to create plastics.)
It may seem overwhelming with the different resins available nowadays. You can view choose if you have octene, metalocene, butene, hexene, etc… An educated sales rep will be able to help know what grade to work with. Each grade has different characteristics and choices must be depending on applications. Understanding resin properties is critical in formulating the right product on your specific application.
Film Thickness (Gauge)
Polyethylene film thickness is measured by thousandths of an inch, or milli-inch. The thickness in the bag doesn’t necessarily correlate into strength. A whopping gauge bag is not always strong. Frequently it is a combination of resin grade and gauge in accordance with the applying. A two mil octene linear bag may have more strength compared to a 2 mil butene linear.
Tensile Strength vs. Impact Resistance
Tensile strength could be the maximum stress that a material can withstand while being stretched or pulled before breaking. Why is this important?
It is advisable to have a very plastic bag which is sufficiently strong enough for your application. A plastic bag that holds 50 pounds of material must have adequate tensile strength, otherwise the bag will end up breaking.
Impact resistance is often a material’s ability to resist shock loading. What does this imply?
Basically it’s the film’s power to resist being punctured. A punctured bag may result in contaminated goods or product loss.
When scouting for the best gauge and resin formula you should consider how tensile strength and impact resistance are tightly related to your packaging application. A good example that can correspond with can be a garbage bag. I’m sure they have got had failure within a garbage bag whether or not it breaks when lifting from the can (tensile strength) or waste material punctures holes in it (impact resistance). Wonderful these variables when choosing the proper formula for your polyethylene package, creating a knowledgeable salesman is important.
Well isn’t there is a lot to understand about making Polyethylene "Film and Bags"!?!
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