There are several distinguishing characteristics of the corrugated board used by SCA Packaging’s Industrial Division. These are combined to create a portfolio of strong, durable materials suitable for the large quantities and heavy, high-value items for which we supply industrial packaging. That is why it is called: Heavy Duty corrugated board.
Use of predominantly KRAFT liners
Kraft paper is manufactured from fibres obtained from coniferous trees such as pine, spruce and fir. Coniferous trees have long cellulose fibres (typically between 2.5 – 5mm in length) which bind together giving great strength to the Kraft paper produced.
Use of ‘semi-chemical’ fluting rather than ‘waste based’ fluting
Semi-chemical fluting is manufactured by using the so-called semi-chemical process. This process is required because hardwood trees (such as birch, maple and chestnut) have short fibers. The process actually binds the fibers together making them longer. In contrast the fibres of the waste based fluting used in 'conventional' boards are significantly shorter due to the fact that they have been through the paper manufacturing process previously.
Liner papers typically of 900 grams or more
The combined weight of the liners used in our heavy duty boards can exceed 900 grams per M2. These heavyweight papers are used further to increase the strength of the corrugated board.
Wet-strength adhesives
Wet-strength adhesives ensure that the board does not delaminate when in conditions of high humidity, for example when being shipped to the tropics in a sealed freight container.
Water resistant liners
Water resistant liners (especially 'wet-strength kraft' used for the most demanding applications) protect the board from excessive absorbtion of moisture, as when a case is exposed to heavy rain during transit operations.