Resins… Film thickness… Tensile strength… Impact resistance… What do all of these terms mean to you when buying your polyethylene bags?
If you aren’t a poly salesman and have a qualification in Plastics Engineering, the terminology utilized in the industry probably makes your mind spin. To help you out, we’ve created Polyethylene Packaging 101.
Resins (Looked as: Any of numerous physically similar polymerized synthetics or chemically modified natural resins including thermoplastic materials such as polyvinyl, polystyrene, and polyethylene and thermosetting materials such as polyesters, epoxies, and silicones which might be used in combination with fillers, stabilizers, pigments, and other components to form plastics.)
Some think it’s overwhelming because of the different resins available these days. How do you choose for those who have octene, metalocene, butene, hexene, etc… An educated sales agent should be able to help figure out what grade to use. Each grade has different characteristics and choices should be based on applications. Understanding resin properties is crucial in formulating the correct product for the specific application.
Film Thickness (Gauge)
Polyethylene film thickness is measured by thousandths inch, or milli-inch. The thickness in the bag does not always correlate into strength. A whopping gauge bag isn’t necessarily strong. Usually this is a mixture of resin grade and gauge relative to the application form. A two mil octene linear bag may have more strength than 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?
It is advisable to have a very plastic bag that is certainly sufficiently strong enough for your application. A plastic bag that holds 50 pounds of cloth will need to have adequate tensile strength, otherwise the bag will end up breaking.
Impact resistance can be a material’s power to resist shock loading. Precisely what does this imply?
Basically oahu is the film’s capability to resist being punctured. A punctured bag could lead to contaminated goods or product loss.
In choosing the right gauge and resin formula you should consider how tensile strength and impact resistance are relevant to your packaging application. An example which everybody can relate to is a garbage bag. I’m sure they have had failure in a garbage bag whether it breaks when lifting out of your can (tensile strength) or waste punctures holes within it (impact resistance). Effortlessly these variables in choosing the best formula for your polyethylene package, developing a knowledgeable salesman is important.
Isn’t there was clearly a lot to know about making Polyethylene "Film and Bags"!?!
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