How Peel Strength Test Is Changing Face of Flex Pack?

Peel strength is general test performed between two substrates that are bonded together with either heat sealing or adhesive. Primarily this test is performed for adhesive bonding. Because adhesion severely gets affected by conditions of surroundings. For e.g. in humid conditions, the adhesion strength loosen up and starts affecting the content inside the packet. Not only for flexible packaging, many other industries find interesting ways of performing this test.

Let’s take the example of packaged delivered by ecommerce companies. The flexible packing used specially for clothes and footwear. It has a very strong adhesion strength, as tampered seal goes straightway to rejection of parcel. On the other hand, if the seal fails, the contents inside the packet may get spoiled and packaging company has to bear the loss. Also, this affects the reputation of packaging company.

The aim of peel test is to estimate the strength of the material that is used to bond the two materials. The more an adhesive is sticky, the more it has peel strength. A peel tester is used to perform this test. The value measured by the device is used to determine the suitability of the adhesion for the application.

Types of Peel Test

• 90° Peel
• 180° Peel

The peel tester offered by Presto performs the test in ‘T’ shape. The substrates are fixed into the fixtures of the machine. Similar to the tensile test; movable lead screw will apply the outward force on the sample to detach the adhesive materials bonded together. It will continue to apply the force until the sample detaches completely. The force applied to separate the bonding will be displayed on the screen. This measurement can be considered as the standard strength of the sample for the lot.