'What is a good seal?'

Existing equipment is available to test the 'burst strength' of a seal by using the limits of pressure or weight it may support, however, until now, there has been no single piece of equipment developed to measure the 'peelability' of a sealed tray.

Our new piece of equipment, ProTest, is able to do just that: analyse, record and report the force required to peel a lid from a tray, enabling the user to determine if the seal strength is suitable for the product’s life-cycle.

  • Features

    Standard design features and benefits

    ProTest take the guessing out of tray-sealing and peeling;

    The ProTest is an automated lid-peeling device, designed to measure and report the resistance offered by the film as it separates from the tray during the moment of lid peeling.

    With its easy set-up, the user can specify the strength of peel required for the specific product, process, material or environment of their production facility.

    Having a ProTest on site gives up-to-date, line-by-line seal integrity analysis, cutting out the need to send samples off site for costly, third-party testing.

    The ProTest is capable of retaining, displaying and outputting test data, allowing the user to export the information. Once exported it’s possible to compare up to five test results against one another simultaneously, in a variety of formats.

    Reports are initially generated for review on the machines built-in, 12-inch, high-definition touchscreen. Alternatively, this data can be quickly exported via Ethernet or USB device.

    The exported data provides the user with traceability records and assurance of peel strengths maintained throughout production. The understanding of peel strength both before and during the production process can be a priceless tool in solving any seal issues.

    ProTest is designed with a user-friendly interface for simple operation. The unit is robust, self-contained and very simple to operate, requiring only 1200mm x 400mm of bench space.

    ProTest is designed to be flexible to suit the vast majority of trays used in the market place.

    Technical Specification

    Compact, bench-top testing equipment suited to any working environment.

    ProTest Specification

    Height 806mm
    Length 1074mm
    Width 378mm
    Weight 51kg
    Electrical Supply 230V

    Tray Capacity

    Tray Depth Max 120mm
    Diagonal Pull Max 380mm

    ProTest is designed to be flexible to suit the vast majority of trays used in the market place.

    The maximum diagonal pull the machine is capable of is a diagonal tray diameter of 380mm. There is no limit to the shape of the tray or how small it can be.

    Lid Peeling Defined

    A peelability test is achieved in five easy steps:

    • Switch on the unit
    • Choose which tray from your production you wish to test
    • Secure it, using the specially designed film clamp and tray support
    • Fill in some details to identify the materials and parameters before testing
    • Press Go.

    By employing a ProTest unit, the user is able to establish their own Peelability Metrics for the specific tray size, tray material, film, and process.

    To be able to fully understand the results produced by a ProTest unit, Proseal have established a set of ‘Peelability Metrics’ to break a single peel down into four stages of assessment:


    To obtain the initial separation an increased weight of draw is required at a 45 degree angle between the tray and film.


    A lower weight of draw is required as the film peels along the straight edges of the tray.


    The draw weight increases slightly as the film reaches the corners diagonally across the tray.

    4. PEEL END (PE)

    This is the last draw of the film which increases as the last corner of bond is separated.