Resins... Film thickness... Tensile strength... Impact resistance... What can many of these terms mean for your requirements when buying your polyethylene bags?
If you're not a poly salesman or have a degree in Plastics Engineering, the terminology found in the industry probably makes your head spin. To help you out, we've created Polyethylene Packaging 101.
Resins (Thought as: Any one numerous physically similar polymerized synthetics or chemically modified natural resins including thermoplastic materials like polyvinyl, polystyrene, and polyethylene and thermosetting materials for example polyesters, epoxies, and silicones which can be used in combination with fillers, stabilizers, pigments, along with other components in order to create plastics.)
You may find it overwhelming with all the different resins available today. How does one choose when you have octene, metalocene, butene, hexene, etc... A qualified sales rep can help evaluate which grade to work with. Each grade has different characteristics and choices needs to be depending on applications. Understanding resin properties is very important in formulating the best product to your specific application.
Film Thickness (Gauge)
Polyethylene film thickness is measured by thousandths inch, or milli-inch. The thickness of the bag doesn't necessarily correlate into strength. Huge gauge bag isn't necessarily strong. Frequently it's a combination of resin grade and gauge relative to the approval. A couple mil octene linear bag may have more strength than the usual 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 is this important?
It is critical to use a plastic bag that is strong enough to your application. A plastic bag that holds 50 pounds of material will need to have adequate tensile strength, otherwise the bag can be breaking.
Impact resistance is often a material's capacity to resist shock loading. Precisely what does this imply?
Basically it's the film's capability to resist being punctured. A punctured bag could lead to contaminated goods or product loss.
When scouting for the right gauge and resin formula you will need to consider how tensile strength and impact resistance are tightly related to your packaging application. One example that everyone can relate with is often a garbage bag. I know they have got had failure within a garbage bag whether it breaks when lifting out from the can (tensile strength) or waste materials punctures holes inside it (impact resistance). With all these variables in selecting the proper formula for the polyethylene package, developing a knowledgeable salesman is essential.
Is not there was much to understand about making Polyethylene "Film and Bags"!?!
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