The Ultimate Guide to Corrugated Boxes: Types, Uses & ...

09 Dec.,2024

 

The Ultimate Guide to Corrugated Boxes: Types, Uses & ...

When it comes to corrugated packaging, individuals often mistakenly consider cardboard as the only type of packaging material. However, there is more to it than that. Cardboard is one type of material, and corrugated cardboard is another. Both materials are often confused with one another but serve different purposes depending on the product.

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In this post, we will explore the differences between cardboard and corrugated cardboard, go in-depth into the various aspects of corrugated material, look into quality control, and discuss the benefits and uses of such material. By the end of this article, we hope to give you a better understanding of corrugated boards so you can make the best decision for your product&#;s packaging!

Source: PakFactory

What is a Corrugated Box?

A corrugated box is a container made from sheets of packaging material known as corrugated cardboard. Due to its strength and durability, corrugated boxes are widely used for shipping large or heavy products. In fact, 95% of all shipped products in North America use corrugated material!

And, What is Corrugated Cardboard?

Corrugated cardboard, also known as corrugated fiberboard or corrugated cartons, typically consists of three layers of kraft paper: two outer layers of flat linerboard and an inner layer of fluted (wavy) medium. For example, pizza boxes are commonly made from corrugated cardboard.

In some cases, additional layers can be added for extra protection, which we will discuss in more detail later.

Cardboard vs Corrugated &#; What&#;s the Difference?

Now that you know what corrugated packaging is and how common it is in shipping, you may wonder what the difference is between corrugated and cardboard. We&#;ve mentioned briefly that corrugated cardboard differs from cardboard, but let us unpack this topic further.

Corrugated Cardboard

Cardboard is generally made of paper stock or heavy paper pulp. It&#;s typically used in folded cartons for smaller products but can also be used as structural support inside a box to keep its shape during transit. However, cardboard by itself is not very protective.

Corrugated, on the other hand, is different. It has three fiberboard layers, offering increased durability,  protection, and versatility. This material resist bending and is among the best options whether your company is shipping large packages or sending a few products. Still unsure of the difference? Check out the chart below for a comparison!

Liners Materials

With a better understanding of corrugated materials, choosing the most commonly used outside liner for manufacturing corrugated boxes should be less daunting.

  • Kraft Paper liners consist of 70-80% &#;virgin&#; chemical pulp fiber, which results in a top paper grade that is very stiff and durable. It is the most sustainable option out of all the types of corrugated paper materials available, but it is also the most costly.
  • Test Paper liners are less expensive than Kraft because they use more recycled fiber content, resulting in less durability. The higher recycled fiber content also makes the paper more difficult to print on, but it is very common to use test paper as the inner linerboard of a corrugated box.
  • Flute Paper Liners are available in Semi-Chem and Waste Based Fluting. Semi-Chem uses virgin fibers and a neutral sulphite semi-chemical process, while Waste Based Fluting uses 100% recycled fibers.

But speaking of flute paper, now is a good segue into the different flute grades available, too!

Source: PakFactory

Corrugated Flute Types (Flute Grades)

Corrugated flute provides cushioning, strength, and compression-resistant qualities to your package depending on the different flute grades, allowing for even more customization. But before we examine each flute profiles in detail, look at our corrugated flute chart for a quick visual comparison:

  • A-Flute &#; 1/4&#; thick is the largest flute size. This flute grade has the highest protection and cushion qualities. It is very good at handling compression and stacking and is often used for packaging fragile items.
  • B-Flute &#; 1/8&#; thick flute appears much thinner than others but is still quite strong, with excellent puncture and crush resistance. B-flute has outstanding all-around performance for various packaging or as additional material for padding and dividing. It even has a flatter surface for higher-quality printing and easy die-cutting. 
  • C-Flute &#; 3/16&#; thick is flexible and one of the corrugated boxes&#; most versatile flute grades. It has average crush resistance, stacking strength, and printing properties. You have likely seen C-Flute corrugated cardboard used for shipping boxes but also for packing glass, dairy, and furniture products.
  • E-Flute &#; 1/16&#; thick is not typically used for shipping. E-flute thickness is on the thinner side of flute grades, so it is often used as an alternative for paperboard folding cartons. However, you may still use E-Flute for cosmetics, fragile glass, ceramics, and other small and delicate products. E-Flute has excellent compression strength, crush resistance, and a relatively flat surface for high-quality printing applications.
  • F-Flute &#; 1/32&#; thick has protective qualities similar to E-Flute but with an even smoother surface for high-quality printing. It is common for you to use F-Flute for clamshell packaging in the US fast-food industry, but in Europe, this grade of fluting is a standard option for specialty and retail packaging.

Source: PakFactory

Types of Corrugated

Now that we&#;ve covered the different types of liners and flute grades, it&#;s time to look at combined board! Fluting and liners can be combined in different layers to create a variety of flute structures that have different thicknesses.

  • Linerboard &#; The &#;face&#; of the fiberboard sheet. You glue the flute onto this board.
  • Single Face &#; Consists of one linerboard with the glued flute visible on one side. It is sometimes called corrugated paper.
  • Single Wall &#; The most common thickness. Two sheets of linerboards with one fluted fiberboard glued in between.
  • Double Wall &#; Three sheets of linerboard and two fluted fiberboards in between.
  • Triple Wall &#; Four sheets of linerboard and three fluted fiberboards in between. This option can withstand heavier weights up to almost 300 lbs but is less flexible.

Source: PakFactory

Examining a little further with double and triple walls, different combinations of flute grades are possible with these options. Some industry standard combinations include:

  • AC Flute &#; A mix of the two most protective corrugated grades. AC Flute is excellent if you need extra protection for harsh shipping and handling processes. 
  • BC Flute &#; An outstanding all-around performer, this combination provides high-level transit protection and is common for shipping boxes.
  • EB Flute &#; Provides superior transit strength and safety, while the outer E-Flute allows for an excellent, high-quality printing surface.

Corrugated Box Styles

With everything from construction to thickness covered, the corrugated box styles is the last topic to cover before moving on to quality control. By combining layers, customizing flute grades, or adding interior padding, corrigated boxes can fit any packaging need. 

Custom corrugated boxes meet any specific requirement of the user. Some common types of corrugated boxes include:

  • Tab Lock Roll End
  • Roll End 3 Flaps Tuck
  • Roll End Tuck Front
  • One Piece Folder Box
  • Tuck Top Auto Bottom
  • Regular Slotted Box
  • Full Slotted Box
  • Half Slotted Container (HSC Box)
  • Gusset Folder

Source: PakFactory

To view more box styles , visit PakFactory&#;s corrugated box catalog.

Quality Control Tests

With the sheer amount of design and customization options available at your fingertips, there might be many questions about protection. Corrogated boxes are subject to stress and impact during packing, shipping, and storage, so there needs to be ways to test your custom package&#;s strength.

Some standard tests include the Edge Crush, Flat Crush, and the Burst Test.

  • Edge Crush Test is one of the essential tests for corrugated cardboard. As the name implies, force is applied perpendicular to the edge of the corrugated cardboard until it buckles. The results ensure the strength and durability required to handle heavy loads and stack resistance.  
  • Flat Crush Test is also used and is similar to the Edge Crush Test. Force is applied directly on the surface area of the corrugated cardboard until the flute flattens and compromises its structure. This test similarly determines the compression and stacking resistance of the corrugated cardboard required to carry heavy loads.
  • Mullen Test (or Burst Test), is a standard industry measures that challenges the durability of the corrugated cardboard surface by determining the force needed to puncture the board.

All of these tests ensure the quality of custom corrugated packaging so your products have the highest level of safety they need to reach their final destination.

Source: PakFactory

Box Maker&#;s Certificate

After customization and thorough testing, it&#;s time to learn about the Box Maker&#;s Certificate (BMC). The BMC provides quick specifications about the box and comes in two versions: the ECT-rated BMC and the Mullen-rated BMC.

You will notice a few differences, but these box manufacturer certificate provide the same information:

  • The Box Manufacturer on the outer ring indicates the company responsible for manufacturing your box.
  • Board Construction is the information displayed directly under where it says box certificate. This information tells whether the box is a single, double, or triple wall.
  • Minimum Combined Weight Facings is the total weight of the linerboard used before the entire linerboard is cut and made into boxes.
  • Size Limit refers to the maximum outer measurements of the box, which are used for storage and shipping purposes.
  • Gross Weight Limit is the maximum weight allowed for the box and the items within.
  • City and State are located at the bottom of the label. It indicates the location where the box is constructed and shipped.

Benefits of Corrugated Packaging

If you&#;ve been following along, you probably already know some of the benefits of corrugated packaging. Here are the main reasons why corrugated cardboard is popular:

  • Protection and Durability &#; Corrugated boxes provide excellent protection and durability for items during transit. They can absorb impacts and offer cushioning support, making them ideal for shipping. These boxes withstand harsh conditions without damaging the contents and serve as an effective barrier against the elements, making them best for e-commerce packaging.
  • Environmentally friendly &#; Sustainability is becoming increasingly important, particularly in packaging. Corrugated cardboard is a top choice packaging option for sustainability because it is made from recycled fibers, which makes it easier to recycle.
  • Customizable &#; Because of the many options available for raw materials and their environmental-friendliness, corrugated packaging is the best option for those looking for bespoke packaging, including printing. The shape and thickness are easily customizable alongside graphics and surface printing.

What About the Disadvantages of Corrugated Boxes?

Many industries benefit from using corrugated packaging, especially e-commerce. Depending on the size and shape of the packaging, shipping and mailing can be more manageable. However, there are still some drawbacks to using corrugated boxes.

  • Limited Weather Resistance &#; For starters, corrugated boxes are susceptible to inclement weather, such as rain or snow. The packaging can become deformed or lose its shape.
  • Cost Considerations &#; The main drawback of using corrugated cardboard is its cost. It is relatively more expensive than other options due to supply chain disruptions, such as those caused by COVID-19, and environmental regulations aimed at reducing deforestation and promoting sustainable forestry.

These drawbacks may be disheartening for companies with lower budgets. However, it&#;s important to weigh these drawbacks against the benefits it offers in terms of protection, recyclability, and versatility. Moreover, there are many ways to reduce costs and create affordable luxury packaging!

Source: PakFactory

Create Your Custom Corrugated Boxes Today!

Corrugated packaging is durable and customizable, providing creative freedom in corrugated box design to keep your product safe during transport. To learn more and start your project, contact our packaging specialists today!

The Complete Guide To Understanding Corrugated Boxes

Is Corrugated The Same As Cardboard?

Although most people confuse corrugated boxes with cardboard boxes, they are not the same. This might lead to a misunderstanding of the terminology. Cardboard is a heavy-duty paper stock that is widely used to make folding cartons and other items. 


Folding carton boxes covering supermarket aisles are frequently made of cardboard. Consider a cereal box or a package of mac & cheese. This is hardly the kind of package you'd expect to make it through the shipping procedure. If you send one of these in the mail, it will almost certainly arrive in tatters.

The strength of a corrugated box, on the other hand, is paramount. 


A liner and a medium make up corrugated boxes. These paper sheets are bonded together. They're usually three layers of fiberboard, but they might be substantially thicker. 


The linerboard, or simply the liner, is the outer layer. Liners are flat materials that are normally found on the outside of the board, but can sometimes be found on the interior, as in the case of a double or triple wall. 


The flute, which is a wavy layer in the center, is the medium. Corrugated packing boxes' strength comes from this inner player, which is why they're so popular for transport and storage.

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What Paper Is Used In Corrugated?

Kraft and test paper are the two most common types of paper used in corrugated boxes.  The interior liner of the box is usually made of test paper, while the exterior liner is made of kraft paper. 


Kraft paper is pricier than test paper, but it is of superior quality.  Kraft paper is created from 70-80% virgin chemical pulp fiber and is made from softwood trees such as Pine, Spruce, and Fir. It's available in a variety of colors and textures, including brown, white, speckled, totally bleached, and birch-faced. 


Kraft paper also has a smoother texture, making it easier to print on. It's also more water-resistant, which means the contents are better protected. It's also more durable than test paper due to its increased rip and burst resistance.

 

What Are Flutes In Corrugated?

The Flute is C-Shaped curls in between to the two substrates, also called "corrugation". It is used to strengthen or reinforce the walls of your packaging. They look like wavy c-shaped lines that are glued to a paperboard. Fluting in the box gives your packaging strength and helps withstand any damage.


The flute size influences the thickness of the box walls and the stacking strength of the box. Flutes are identified by a letter that indicates their size. They're counted by their thickness and the number of flutes per linear foot.


The most popular flute sizes are:


A Flute


At 1/4" thick, the A-Flute (33 flutes per linear foot) is the biggest flute. Because of its thickness, it provides a lot of protection and is a fantastic choice for fragile things.


B Flute


B-Flute is 1/8" thick and has 47 flutes per linear foot. This is much thinner than A-flutes, but it has a surprising amount of strength. It&#;s often used for counter displays or canned goods. Die-cut designs are common with this flute.


C Flute


3/16" thick C-Flute (39 flutes per linear foot). Because it's the most popular option for shipping boxes, this is definitely the one you're most familiar with. 


E Flute


E-Flute (90 flutes per linear foot) is extremely thin, measuring only 1/16" thick. It lacks the strength of the larger flutes, although it does have some benefits. For folding carton boxes, it's occasionally used instead of paperboard. It's easy to store and use, and it prints well.


F Flute


F-Flute (125 flutes per linear foot) is the narrowest of the flute classes at 1/32" thick. Because of its smooth surface, printed designs will appear sharp.

What Are Walls In Corrugated?

Even if you already know what flute size you want, you'll need to make some essential choices. 


Corrugated packaging is available with a variety of wall thicknesses. Sometimes you just need a little extra protection for your items, and other times you need something more substantial.


Here are the are few types of walls you can choose from:


Single-Face


This is a single sheet of liner attached to one sheet of corrugated media that is normally offered in rolls. It provides extra padding for fragile things. If you're transporting something fragile like glass or electronics, you might use this as an extra layer of protection.


Single-Wall


One sheet of corrugated medium is attached between two sheets of liner in a single-wall construction. It's the most prevalent and what most people think of when they think of a corrugated cardboard box.


Double-Wall


This is more durable than single-wall, although it is less flexible due to the additional layer. This is sometimes used in certain POP Displays and packaging when additional protection or strength is needed. But it can potentially cause issues when printing, so the artwork must be designed to work specifically with its unique structure.


Triple-Wall


With three stacked corrugated sheets and four liner board facings, this is the strongest. It's commonly utilized for industrial parts or produce containers. It's extremely heavy-duty, and can be difficult to print certain artwork, just like double-wall. So if you choose triple-wall, it must be for a certain application.

What Are Different Packaging Styles?

Finding the perfect fit is also vital when choosing the right corrugated packing box for your products. Corrugated boxes are available in a variety of forms and sizes. You don't want to squeeze your belongings, but you also don't want them to float around. There are more packaging options, but these learning about the different styles is important.


Keep in mind that the internal dimensions of a box are stated as length x width x height when choosing a box size (L x W x H). 

Here are some of the most popular box styles to pick from:


Regular Slotted Container (RSC)


The most common is this one. Consider a standard shipment box. All of the flaps on this box are the same length, and when the box is closed, the two outer length flaps meet in the middle. The flaps will need to be taped together.


Full Overlap Container (FOL)


Because both sets of outside flaps fully overlap, making the box double-layered on top and bottom, this sort of box has increased strength.


One Piece Folder (OPF)


You've probably seen one of these boxes if you've ever ordered a book or other media materials online. They're folded into a box after being creased and slotted. They're sleek but functional.


Full Telescopic Design (FTD)


This box has a top and bottom that fit over each other, as the name implies. Its increased strength comes from the twin walls. Of course, these containers must be sealed in some way. For heavy-duty loads, corrugated boxes are usually sealed with packaging tape, tuck-in flaps, or strapping. 

All of these options can be intimidating, but there are a variety of tools and services to help you get started on your search for the ideal box. If you'd like to learn more, you can talk to a representative at Bennett Packaging.

What Is Packaging Certification Testing?

Of course, if you've gone to the work of figuring out what flute grade and wall type you'll need, you'll want some confidence that the box will perform as expected. And, in the end, that means safeguarding the contents of the box. 


Everyone wants a box that will keep their belongings safe. No one wants to find their packaging crumpled and the items inside damaged.


Corrugated boxes go through a thorough testing process when it is needed. Depending on the retailer, or situation you are in, you might need to go through one yourself.


Here are four of the main tests conducted for corrugated boxes:


Edge Crush Test (ECT)


The Edge Crush Test determines the box's stacking strength, which can help you determine things like pallet shipment durability. ECT is a laboratory test procedure that involves compressing the board's edge between two plates. It's expressed in pounds per linear inch and is used to calculate a box's maximum compression force.


Bursting Test (Mullen)


The force required to rupture or puncture corrugated cardboard is measured in the Bursting Test. This test determines how well a box will protect the contents of the box during shipping.


Flat Crush Test (FCT)


The Flat Crush Test assesses corrugated paperboard's resistance to flute crushing. Whether you pick digital or offset printing, this will help you calculate how much pressure you can safely apply to your box throughout the printing process.


Water Absorption Test (COBB)


Under defined settings, a Water Absorption Test determines how much water corrugated fiberboard absorbs over a period of time.

Order Custom Packaging Today!

Finding the right corrugated box for your needs can be a daunting task. However, with the help of this guide, you should now have a better understanding of what to look for when ordering custom packaging. Finding a packaging manufacturer is an important step in your business, and we are here to help.


Always keep in mind the importance of protecting your belongings during transit, and remember that Bennett Packaging is here to help with all of your corrugated box needs. Contact us today for a custom quote on boxes.

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