Measuring the strength of the material to resist deformation when force is applied on the direction perpendicular to the plane surface of the material is known as an internal bond test. The strength of the paper is measured in three different directions. The internal bond test is also performed on papers and paperboards. During the process of making papers, a layer of fiber is placed between two papers. The internal bond strength states the strength required to separate the fibrous layers. It is important test which is considered mainly at the time of offset printing to ensure that the paper will not get delaminate when subjected to a perpendicular force such as peel. This type of bond is also found in blister packaging.
The internal bond strength of papers and adhesives can be testing using a testing instrument which is effective enough in creating opposing forces to delaminate the sheets. This can be testing using Peel strength Testers in which a sandwich form of the sample is placed between the grips to peel off the layers of the materials. Presto Stantest, a global leader famous for manufacturing and supplying high-quality testing machines, offers high-quality of internal bond strength testing machines such as Peel Strength Tester, Bond strength Tester. The instruments offer highly accurate and reliable test results.