How to Save Money with 2-PLY Extensible Paper Bags

October 6, 2020

For decades, multi-wall paper bags have been constructed from three or more plies of traditional natural kraft paper.

However, modern sack kraft paper is now so strong that 3-ply bags are seldom necessary.

2-PLY Extensible Paper Bags

Two-ply bags made from high-performance extensible paper can easily hold up to 100 pounds of material. Plus, it fills faster and provides a more environmentally sustainable package.

Few paper plies yield such significantly reduced paper bag costs.

Traditional Kraft Paper vs High-Performance Extensible Paper

First, let’s review the characteristics of each type of sack kraft paper:

Traditional Kraft Paper

High-Performance Extensible Paper

Manufactured from short wood fiber

Manufactured from long wood fiber

Heavy, coarse sheet

Smooth sheet

Strength through high basis weight

Strength through superior stretch and flexibility 

Limited stretch

6-7% stretch 

Low levels of porosity

High levels of porosity 

Limited energy absorption 

Superior energy absorption 

Ideal for 3-4 ply bag construction 

Ideal for 2 ply bag construction 

What is Kraft Paper?

Kraft Paper is made entirely from wood pulp and produced by a modified sulfate pulping process. The paper is coarse and noted for its strength. The name is obtained from the German word “kraft” meaning strength. Its natural color is brown, but by using semi-bleached or bleached sulphate pulp it can produce lighter shades including white.

What is Extensible Paper?

Extensible paper is made from long, slender, flexible cellulose fibers. The paper is smooth and noted for its stretch. Extensible paper is produced mechanically by compressing a paper web between a rubber blanket and a drying roller. The process produces a paper with a built-in stretch, which produces greater strength and permits fewer paper plies in a bag.

The Benefits of 2-PLY Paper: Greater Performance, Less Cost

Transitioning from 3-ply natural kraft to 2-ply extensible paper reduces the raw material in the package by a full paper layer. Thus, substantial cost savings may be achieved when selecting this packaging method. The reduction of raw paper material in the bag brings the following advantages:

  • Less paper per bag
  • More bags per pallet
  • More bags per container
  • Faster filling
  • Higher porosity
  • Reduced dusting
  • Greater overall strength
  • Improved printability
  • Improved palletizing

Extensible Paper Bag Features

1. Less Raw Material – Improved Sustainability

Bags constructed with fewer plies significantly reduces the amount of paper required to produce a finished bag. This, in turn, limits the ecological impact on our forests. Continuous investments in new technology are made to achieve even better energy efficiency and raw material usage.

2. More Bags – Reduced Freight Costs

Two-ply bags allow a customer to receive up to 30% more bags per truckload/container. The increase in the number of bags per load reduces the inbound freight cost per bag substantially. Furthermore, fewer freight movements reduce our overall carbon footprint.

3. Improved Strength – Less Breakage

Brown and bleached (white) extensible sack kraft paper grades offer excellent strength properties. The strongest grades have a TEA index of up to 3.8 J/g. These grades are ideal for 2-ply industrial bags with a filling weight of up to 110lbs (50kg).

4. Higher Porosity – Faster Filling

For fast and dust-free cement filling or other powdered goods, we offer papers with a perfect combination of strength and porosity. These papers are porous enough to allow efficient deaeration of bags during filling so that perforation is not needed, yet they are strong enough to withstand the tough demands of filling and handling. Enhanced Printability – Brand Recognition Our white sack kraft paper grades in particular offer excellent print characteristics. The smooth paper surface and uniform paper formation achieve a high-quality print result that enhances your bag’s point-of-purchase appearance.

Types of 2-ply Extensible Paper

1. Valve (PVSE)

Valve (PVSE)

A Pasted Valve Stepped End (“PVSE”) multi-wall paper bag, is a common industrial packaging style designed to package a wide variety of dry, flowable products. Valve bags are packed on equipment that deposits material into the bag via a horizontal filling spout. When the bag is discharged from the packing equipment, the forces generated by the product inside the bag allow the valve opening to self-seal.Two-ply valve bags are one of the most common industrial bag styles in use today with much of the world’s cement, minerals, and resins packed in them.

2. Sewn Open Mouth (SOM)

SP_Blog_Sewn Open Mouth (SOM)

A SOM bag is an open mouth bag that is closed using sewing thread.

The bag has a flush-cut tube that is factory closed at one end and left open at the other end for the customer to pack and sew closed.

This bag style can be gusseted or made with a flat tube. SOM bags are typically manufactured in 3-ply natural kraft paper. However, 2-ply extensible paper SOM bags are growing in popularity due to their strength and cost-effectiveness.

3. Pinch Bottom Open Mouth (PBOM)

SP_Blog_Pinch Bottom Open Mouth (PBOM)

Used for medium to large format products of varying density, PBOM bags are ideal for high-end and sensitive products in the chemicals, food, pharmaceutical, and pet food industries when barrier liners are required to optimally preserve the bag’s contents.

PBOM bags can be closed by sewing, but they are most often closed/sealed by Pinch Bag Closers (PBC) using a pre-applied hot-melt to create sift proof closures. PBOM are typically manufactured in 3-ply natural kraft paper. However, 2-ply extensible paper PBOM bags are capable of being produced and offer similar strength and cost benefits.

4. Self Opening Satchel (SOS)

SP_Blog_Self Opening Satchel (SOS)

An SOS bag is a block bottom, gusseted style bag that is capable of standing up unsupported due to its flat, machine-formed base. SOS bags provide superior stability during filling.

Also, their shape stacks well and creates a stable pallet load.

Two-ply extensible paper SOS bags are commonly used for retail goods such as charcoal and pinion wood.

Ready to Cut Packaging Costs with Extensible Paper Bags?

Our multi-wall paper bags are produced with state-of-the-art converting equipment in plants located domestically and abroad. Available in traditional kraft or high-performance extensible paper, Southern Packaging offers a wide variety of bag styles to suit all your multi-wall paper packaging needs.

As one of the premier bulk packaging distributors in the country, we have succeeded by listening to our customers, identifying their needs, and delivering on our promises. Strategically located near Dallas, Texas, our company buys, sells, and delivers more than 1,100 different industrial packaging products to nearly 900 locations across the U.S. Our substantial inventory includes all styles of FIBCs, paper bags, UN-certified bags, BRC & AIB food quality bags, polybags, BOPP bags, dunnage bags, and bulk shipping supplies.If you are interested in any of our products, please contact us today!

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