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We manufacture HDPE (High Density Polyethylene) poly bags from very small to large sizes, as bottom seal or sideweld style on our 13 bag making machines. We deliver on time, on spec and on price. We simply do what we say that we will do.
Advantages of HDPE Poly Bags
Better Temperature Resistance: HDPE has a higher temperature resistance than LDPE or LLDPE, allowing molded parts to be packed hot off the press, without causing holes or melt through of the packaging. The softening point of HDPE is approximately 210-220 degrees Fahrenheit.
Additive Free: HDPE is an additive free material. LDPE and LLDPE must have slips agents and antiblock additives so that the bags do not stick together (blocking). As HDPE does not contain these additives, it is ideal for packaging of products that might be adversely affected by contact to slip and antiblock.
Non-scratch Properties: For packaging of optical lenses, HDPE's inherent additive free nature is a good choice. The antiblock additive found in LDPE and LLDPE is typically diatomaceous earth, calcium carbonate or in some cases talc. All of these additives are abrasives that can cause scratching on optical surfaces.
Stiffer, Stronger: HDPE has a higher density than LDPE or LLDPE resins, making this a stiffer material. For many applications, this allows the poly bag to be manufactured thinner, thus saving cost.
Best Moisture Retension Properties: Whether the package is trying to hold moisture inside the package, or keep moisture from migrating into the package, HDPE poly bags are the best choice.
Best Low Temperature Resistance: HDPE poly bags are superior for very cold temperatures, as the embrittlement temperature is about minus 180 degrees Fahrenheit.
Disadvantages of HDPE Poly Bags
Clarity: HDPE is cloudy, almost frosty, when compared to LDPE or PP bags. For retail applications where the product is being sold outside of the box, this is not the best choice of materials. For colored merchandise bags, however, it is a favorite for T-shirt bag style applications.
Notch Sensitivity: When HDPE poly bags are notched, they are very easy to tear in the direction the film was extruded. This can be a disadvantage or an advantage, depending on the application. In one case, our customer needed an HDPE poly bag for the moisture retention properties and was delighted when we showed him how a notch above the seal would allow his customers to simply "zip" open the package to access the contents.
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High Density Polyethylene Bags
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