Brogaard Kaas posted an update 4 months ago
Resins… Film thickness… Tensile strength… Impact resistance… What do these terms mean for your requirements when buying your polyethylene bags?
If you’re not a poly salesman or have a college degree in Plastics Engineering, the terminology employed in a probably makes your brain spin. To help you, we’ve created Polyethylene Packaging 101.
Resins (Defined as: Any one numerous physically similar polymerized synthetics or chemically modified natural resins including thermoplastic materials for example polyvinyl, polystyrene, and polyethylene and thermosetting materials like polyesters, epoxies, and silicones which can be used in combination with fillers, stabilizers, pigments, and also other components to make plastics.)
Some find it overwhelming with all the current different resins available these days. Would you choose if you have octene, metalocene, butene, hexene, etc… An educated sales agent should be able to help determine what grade to utilize. Each grade has different characteristics and choices must be determined by applications. Understanding resin properties is crucial in formulating the best product on your specific application.
Film Thickness (Gauge)
Polyethylene film thickness is measured by thousandths inch, or milli-inch. The thickness from the bag doesn’t invariably correlate into strength. Much gauge bag might not be strong. Generally it is just a mixture of resin grade and gauge relative to the application form. A couple mil octene linear bag could have more strength when compared to a 2 mil butene linear.
Tensile Strength vs. Impact Resistance
Tensile strength will be the maximum stress a material can withstand while being stretched or pulled before breaking. Why is this important?
You need to have a very plastic bag which is sufficiently strong enough for the application. A plastic bag that holds 50 pounds of fabric must have adequate tensile strength, otherwise the bag can be breaking.
Impact resistance is really a material’s capacity to resist shock loading. What does this mean?
Basically it’s the film’s power to resist being punctured. A punctured bag may lead to contaminated goods or product loss.
When scouting for the right gauge and resin formula it is important to consider how tensile strength and impact resistance are relevant to your packaging application. An example which everybody can connect with is really a garbage bag. I’m sure they have had failure in the garbage bag whether or not this breaks when lifting out from the can (tensile strength) or waste material punctures holes in it (impact resistance). With all these variables in selecting the right formula for the polyethylene package, having a knowledgeable salesman is important.
Well isn’t there was a great deal to learn about making Polyethylene "Film and Bags"!?!
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