Characteristics of the Kraft Material

Custom Kraft Boxes are made with Kraft paper. It is a paper of an extreme resistance, elaborated from kraft chemical pulp, it can be in raw color or bleached color. It is used mainly for wrapping or packaging, for accounting, records, minutes and official documents etc.

Kraft paper is the best solution when we look for a sustainable packaging with great resistance. This type of paper comes from pine trees from properly managed forest plantations. The paper is ideal to be recycled and therefore it is a totally sustainable and respectful with the environment.

As a curiosity we will point out that the thermal kraft paper comes from the German resistance word. This paper is the best solution when a sustainable packaging with a high resistance is required. The paper has FSC forest certification and is made from pines from properly managed forest plantations.

It also has FSC forest certification in relation to the chain of custody, since it guarantees adequate forest management and the paper cycle. Kraft paper is ideal for recycling and, as such, is respectful of the environment.

Custom Kraft Boxes

Custom Kraft boxes are one of the most used consumables in the packaging industry. They are used mainly for shipping, storage, removals, decoration … You can buy these boxes in our store , along with other packaging consumables.

The main objective of this article is to provide as much information as possible about the different types and uses of kraft boxes in the packaging industry, as it is an item that is present in all companies that have warehousing or ship merchandise.

The secret of these boxes  is undoubtedly corrugated or corrugated kraft. Corrugated kraft consists of the union of several compact sheets of paper , separated by corrugations. This gives the kraft good mechanical properties of resistance that makes the difference when buying some kraft boxes or others.

Carton Manufacturing Process

Before proceeding to recognize the properties of these boxes, it is advisable to delve into its manufacturing process. There is a whole process behind what we see when we go to buy kraft boxes . Let’s see the manufacturing process.

The manufacturing process of corrugated kraft for obtaining Kraft boxes will start from the paper reel.The stretched paper of the coil goes through a corrugator or corrugator that will provide corrugations of corrugated kraft.

This corrugated kraft is the one that goes in the middle of two flat sheets of kraft. Finally, several sheets are attached with or without printing on them, to form the kraft box. They are important steps to buy quality boxes.

Carton Properties

To understand the important role played by the kraft boxes in the packaging industry , one must see their physical and mechanical properties. These properties are what we have to take into account when buying kraft boxes to get the most benefit.

The kraft is like paper but thicker, a superposition of papers, is a material that is manufactured from cellulose or wood fiber . Cellulose or fiber is the constituent element of wood. From a chemical point of view, cellulose is a natural polymer formed by glucose units . The fibers are found in the wood joined together by a complex chemical compound called lignin that gives it rigidity.

Durability and Resistance

Although the tendency is to think that the kraft is not an especially strong or resistant material, the wood fibers that compose it are strong and resistant. The kraft does not break easily and is resistant to punctures.

This resistance allows the kraft to withstand well the efforts to which it is subjected during its transformation and use.

Rigidity

As a material, the kraft has the capacity to offer a high rigidity per unit of weight. This feature allows these boxes to protect the contents of the container.

Sustainability

The percentage of corrugated boxes that are made with recycled fibers is 43 percent. Kraft is also the most recycled material, almost all recycled cartons are converted into new kraft products. The kraft is sustainable because the raw material comes from the trees, a renewable source.

Isolation

As you know, wood fibers drive energy and heat badly, so they are good insulators. In addition, corrugated kraft (a type of kraft made of a corrugated piece of thick paper stuck between two thick pieces of paper) has an extra insulation thanks to the grooves trapping the air between two layers.

Adaptability

The kraft can be easily cut and folded to make different types of containers and packaging. It is also easy to print on it and apply treatments to, for example, make it resistant to fire.

Currently you would be surprised by things that can be done with kraft. There is even furniture made of this material.

Thermal Stability

The kraft can withstand temperatures between -40 to 120 degrees Celsius, it is also resistant to boiling water.

Types of Custom Kraft Boxes

We cannot talk about the types of Kraft boxes or kraft boxes that exist in the market without mentioning the FEFCO (European Federation of Manufacturers of Corrugated Kraft) Responsible for the creation of codes for a better understanding and standardization when differentiating said kraft boxes . The FEFCO code defines the measurements and characteristics of each kraft box model in a visual way , with the representation of the assembled box and its unfolding. This allows anyone from anywhere in the world to identify each box model regardless of the language they speak.

Classification of Standard Cartons

Kraft boxes are a very versatile element so it is difficult to establish a general classification of the different types of boxes that exist in the market. There are multiple parameters to enter in the equation such as usage, content, weight … so we have to guide us by a standard criterion as we can find in the FEFCO. However, we will try to make it easier for the consumer to try to show the most common kraft boxes that are usually found in the market. For this we will make a classification:

Kraft Boxes According to Composition

We find in the market different types of kraft boxes according to their composition, or in this case paper. There are other parameters that could go hand in hand such as the type of fiber and the grammage of the paper.

Kraft Paper: Provides mechanical characteristics such as stiffness, resistance, moisture protection … It appears on the outer face of almost all boxes .

Papel Linner: Made with virgin fiber, it presents intermediate qualities suitable to almost all needs.

Biclase Paper: the material for faces that is most used with corrugated kraft. This paper, made up of two or more layers, is composed of recycled material in up to 80%. It is used more for the inside faces.

Fluting Paper: Usually used for interior faces.

Kraft Boxes and Kraft Boxes According to Use and Content

The selection of a type of kraft box or another will depend to a large extent on the use to which it is intended and its content. For example, moving boxes usually have side handles (punched holes) to facilitate their grip and transport, kraft boxes for fruit also usually carry these handles and also small holes for proper transpiration. We also find boxes to transport fragile or heavy material, which will determine the thickness or reinforcement of the same.

• Kraft Boxes for Removals
• Fruit boxes
• Fragile materials

Packaging : Usually adapted to the shape of the product and there is a flexibility for its design

For pallets : With specific measures for the use of pallets.

Kraft Boxes and Kraft Boxes According to Resistance

We can also establish a classification of kraft boxes according to their resistance, one of the most important parameters to take into account when deciding to select one type or another. The grammage acquires a fundamental importance

1- Single-channel Kraft Boxes:

These boxes are suitable for packing , protecting and sending light or load-bearing products (which fill the entire interior volume of the box), and which can support stacking. It is the elementary module of all corrugated kraft and is formed by a smooth sheet (one side), a wavy and a smooth face, joined together with glue.

2- Double Channel Kraft Boxes:

The grammage of the papers, as well as the height of the waves, determine their consistency (ECT) and, above all, their resistance to vertical compression (BCT). This parameter is the most important, since it indicates the weight that a box subject to a load can withstand by stacking.

Classification of Kraft Boxes According to FEFCO

There are around 150 models of kraft boxes collected by FEFCO coding classified into 9 groups. In the following link you can see in detail everything that FEFCO collects, but for now we will summarize the main models of kraft boxes that we will find in the market.

1- Boxes of Kraft in roll, Commercial Plates

Corrugated kraft roll or plates made of corrugated kraft in 3 layers (2 smooth and one corrugated), 5 layers (3 smooth and 2 corrugated) and 7 layers (4 smooth and 3 corrugated)

2- Slotted Kraft Boxes

It basically consists of a piece with glued manufacturing seams, sewn or glued with tape and upper and lower flaps.

They are shipped spread out on a plane, ready for use and are closed using the upper and lower flaps.

3- Telescopic Kraft Boxes

The telescopic kraft boxes are manufactured with more than one piece and are characterized by a lid-bottom that slides on the body of the box.

How to Buy Custom Kraft Boxes with Premium Custom Boxes

Now that we know the importance of having a company that offers an optimal service to buy kraft boxes . We have more than 20 years of experience in the field of machines and packaging products, offering year after year the best quality in our service and in our articles.

When deciding on a Kraft box or a kraft box model, a series of parameters must be taken into account. Type of content, size of the same, weight, fragility, use (removals, storage or for shipping …). Once this concept is clear, we will start to see the most suitable models or types of boxes.