Seal integrity is the key to ensuring quality of packaging goods. Testing the integrity of package seals helps ensure that packaging provides sufficient product protection. Seal quality test analyses the mechanical strength of the seal thereby securing appropriate material bonding to maintain package quality throughout the product’s shelf life. Any defect in the seal can initiate a leak and will contaminate the product while directly harming its shelf life. With the increasing trend towards flexible packaging, the demand for seal testing has readily grown. Since flexible packaging involves using materials that are sustainable, environment friendly and lower in cost it is essential to ensure that the seals of such package remain intact from the point of manufacture throughout its distribution and use. Seal integrity testing is widely used in different industries including Pharmaceutical, Medical Device, Food & Beverage, Nutrition, Bottles & Containers.
Destructive Vs. Non-Destructive Test Methods
Destructive methods are identified as methods that may damage the product during the assessment and even though the seal passes the test the product becomes useless. Since these tests were incapable of finding non-leaking seal defects, demand for such tests has steadily declined. Traditional test methods like peel strength burst or fish tank bubble come under this category.
Unlike destructive methods, non-destructive test methods are those that do not harm the product and they can be returned to the mark after testing. Reduction in wastage coupled with material cost advantage gives non-destructive methods an edge over destructive methods. According to Oliver Stauffer, Chief Executive Officer at PTI - Packaging Technologies & Inspection “There is a huge shift in the industry toward deterministic and quantitative test methods”. Non-destructive test method can be of the following types:
- 1. Vacuum decay test
- 2. Ultrasonic seal test
Vacuum Decay Method (VDM) is used by manufacturers of packages for the food, beverage, industrial and pharmaceutical industries in order to detect leaks in rigid or flexible packages.
Ultrasonic seal test is an innovative non-destructive Seal Integrity Test used to examine seal quality for defects. The ultrasonic seal test has wide application and is primarily used to detect any defects in the seal area. PTI uses Airborne Ultrasound technology which is a non-destructive and non-invasive seal quality inspection method. “Ultrasound is one of the only technologies that are telling us what the quality of that physical bonded nature of the seal materials are,” says Oliver Stauffer, CEO of PTI. This method is applicable for many materials types such as Tyvek®, paper, foil, film, aluminum, plastic & poly. The test is conducted by allowing ultrasound waves to pass through the package seal causing the reflection of sound waves. To identify the defects, variations in the reflected signals strengths are analyzed
PTI offers two variants of Airborne Ultrasound testing technology; Seal-Scan® and Seal-Sensor. The Airborne Ultrasound testing technology creates a quick analysis of the seal area without tampering with the packaging to identify defects such as incomplete or missing seals, wrinkles, channel defects, and so on. The technology is in high demand due to its applicability across different industries.
Reasons to choose PTI’s Seal Scan and Seal Sensor Method:
- 1. Provides quantitative results using non-destructive seal quality inspection
- 2. Accurate and reliable outcome
- 3. Cost-effective
- 4. Can be used on materials like Tyvek®, paper, foil, film, aluminum, plastic & poly
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