Poly Bags, Sealers &

How to measure for Poly Bags

The first dimension stated when describing a poly bag is the width. All bag measurements are inside diameter (ID).

How to measure for Drum Liners

Width = (the circumference of the drum divided by 2) + 2”. It is easiest to use a flexible tape measure and measure around the widest part of the drum.

Length = (height of the drum + the width [diameter]) + 4”. The extra 4” provides the extra material to fold over or tie the bag.

Measuring for Box Liners

Width = (the circumference of the box divided by 2) + 2”. The circumference equals the sum of the length of each side.

Length = ½ the narrow width + the height of the box. Add 5” for results less than 96” and add 8 “ for results greater than 96” for fold over or tie off.

Measuring for Pallet Covers

Width = (the circumference of the pallet divided by 2) + 4”. The circumference equals the sum of the length of each side.

Length = (1/2 the narrow width of the load + the height of the load) + 2”.

How to calculate the roll weight of Poly Film and Poly Bags

Just enter the width, length and thickness of your product and KYANA's handy calculators will compute the shipping weight.

Roll weight of single wound film (including Stretch Film)

Width  Length  Thickness  Result 

Calculation used to determine result:
(Thickness (in mils) x Width (in inches) x Length (in inches)) ÷ 30,000

Weight of 1000 Polybags

Width  Length  Thickness  Result 

Calculation used to determine result:
(Thickness (in mils) x Width (in inches) x Length (in inches) * 1000) ÷ 15,000

Tuf-R® Poly Bags

Tuf-R® Linear Low Density Bags offer lower cost without sacrificing performance!
Use a lighter gauge Tuf-R® bag instead of a heavier gauge LDPE bag for real cost savings and lower environmental impact. Tuf-R® bags perform as well as or better than heavier gauge low density bags thanks to their unique resin blend. Put them to the test today and discover how much money you can save with Tuf-R®.

Compare Tuf-R® bags and it’s easy to see the difference:

•  Tuf-R® bags have superior strength that allows a lighter gauge Tuf-R® bag to do the job of a heavier gauge LDPE bag.
•  Tuf-R® bags have superior clarity thanks to their unique resin blend.
•  Because Tuf-R® bags are bottom sealed and not side sealed like some competitor’s bags, they have the strength you need for your most demanding applications.
•  Tuf-R® bags 15” wide and under are packaged in inner packs of 100 bags each for convenience and cleanliness and to reduce waste.
•  Cases and inner packs are bar coded and clearly labeled for easy identification.


Auto Bagging

KYANA Packaging Solutions offers many different types of packaging equipment. One that is overlooked in a lot of applications is Auto Bagging. Auto bagging has a lot of benefits. Here are just a few:

•  Increase in productivity
•  Lower material cost
•  Decrease in downtime
•  Overall Savings due to less labor

For a quick look at a typical auto bagger in operation, click here.

KYANA Packaging Solutions can help with your auto bagger system and material needs.


Impulse Sealers

There are a few different methods of closing a poly bag. Heat sealing a poly bag is the easiest and most cost effective way of closer. It also has a strong and more reliable seal. By using an impulse sealer you can switch from zip lock bags to an open ended poly bag, saving you in your overall material cost.

Kyana Packaging Solutions also carries the repair kits for impulse sealing elements.


Poly Sheeting

Poly sheeting is used in multiple industries by companies and individuals around the world. It can be used as a simple pallet cover or as cover to protect your material from a leaky roof. Polyethylene is the most common form of plastic used in a variety of packaging, industrial, and construction materials. Polyethylene comes in a variety of densities; poly sheeting is commonly made from a low-density polyethylene. Poly sheeting has many applications. Let Kyana Packaging Solutions help you with your poly sheeting.


Nominal thicknesses of polyethylene sheeting and bags?

There is a growing movement in the polyethylene industry to ship thinner than specified product and calling it “industry standard” or “nominal”. The only allowable standard for labeling polyethylene in the United States is actually codified by the National Institute of Standards and Technology or NIST. Over the years, NIST has refined the standards defined in NIST Handbook 133, to account for advances in polyethylene resin technology. The current version of the handbook is dated 2016.

Section 4.5 of NIST Handbook 133 defines the test equipment and procedures to use when evaluating polyethylene as well as how to evaluate the results of testing. Most polyethylene is sold by length, width, area, thickness and net weight.

The handbook provides the formulas to be used to determine the weight of a roll of film or a polybag. The handbook allows for variations based on the density of the material being sampled. The calculator we’ve provided is for low density polyethylene, but the results will be very similar for LLDPE and HDPE. Utilize the test procedures and calculations in the handbook to determine the exact expected target net weights. Section States: “The labeled weight should equal or exceed the target net weight or the package is not in compliance.”

The NIST handbook has specific methods for measuring the length and width of the polyethylene bags or rolls as well as allowable tolerances. Ensure that the polyethylene product ordered meets your size needs regarding ease of loading, containment, coverage and protection. Our packaging specialists are happy to help define your requirements.

Thickness of the polyethylene is the area where manufacturers try to save money, often beyond what the NIST Handbook allows. The test methods discuss how to measure thicknesses along the width and length of a bag or roll of polyethylene film. Section 4.5.3.A does allow for manufacturing variation at individual test points of up to 20% less than the declared thickness for thicknesses greater than 1 mil or even 35% below the declared thickness for thicknesses less than 1 mil. But 4.5.3.B brings it back together by stating; “The average thickness for any single package should be at least 96% of the labeled thickness.”

Remember, the Net Weight has to be at least as much as the calculated weight, so if the average thickness is less than the declared thickness (by up to 4% allowed) the manufacturer has to make up for the thinner product by providing more “each” in the box to meet the declared net weight.