Box Plant Basics - Raw Materials

SKU: C-464Duration: 24 Minutes Certificate Included

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Course Details


Training Time: 24 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English

This course describes wood fiber sources, chemical pulping and papermaking processes, and various glues, inks, and coatings used in the production of corrugated board and corrugated boxes.

At the end of this module, you will be able to:

  • Identify and describe the components of corrugated board
  • Describe pulping and papermaking processes
  • Describe the corrugating process
  • Define "linerboard"
  • Describe corrugating medium
  • Identify and describe different corrugating adhesives
  • Describe the function of biocides and fungicides
  • Identify and describe manufacturer's joint glue
  • Differentiate between coatings for corrugated board
  • Describe different types of printing inks

The following key questions are answered in this module:

Why is corrugated board brown?
Corrugated board is made from unbleached wood fibers, which are brown because they contain residual lignin. Lignin is the glue that holds the fibers together in wood.

How is white corrugated board made?
White bleached pulp can be deposited on top of linerboard on a paper machine to produce one white printing surface, or the linerboard can be made entirely of bleached pulp.

What is the difference between linerboard and corrugating medium?
Linerboard needs to be strong, while medium needs to easily conform without breaking. Linerboard is usually made from long softwood fibers, and OCC is sometimes added. Medium is usually made from NSSC hardwood fibers or OCC.

How can microbiological growth be prevented in starch-based adhesive systems?
A biocide and fungicide program can help prevent microbiological growth. It is also important to clean out the entire adhesive system on a regular basis.

What kind of glue is used to make manufacturer's joints?
Water-based PVA (poly vinyl acetate) adhesive or "cold glue" is widely used to make manufacturer's joints. PVA adhesive is strong, inexpensive, and easy to use because it doesn't require heating. A PVA glue joint will fail when it gets wet, but usually after the adhesive in the corrugated board fails.

Below is a transcript of the video sample provided for this module:

Corrugating medium is also unbleached and brown though the demands placed on it are quite different from the liner board. While liner board needs to be strong, the medium needs to easily conform without breaking. Medium is typically made from hardwood pulped in the neutral sulfite semi-chemical process or recycled fiber from old corrugated containers. These pulps both have shorter fibers and the paper produced from them is easily fluted on the corrugator. The medium is usually lighter and thinner than the liner board. It gives strength to corrugated board because of its curvature and shape, not its thickness.

Use the additional resources and links below to learn more about this topic:

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