Flexible packaging welded seal strength

  • Mecmesin

As a global brand, manufacturing products for the cosmetics, domestic, healthcare and food industries, it is vital for Reckitt Benckiser, formerly SSL International, to undertake measures to critically assess and guarantee product quality. This also includes the packaging involved in the production and long-term integrity of the product.

The use of flexible packaging, manufactured with welded seals, requires validation tests to define and standardise seal strength and overall packaging manufacturing consistency. Poor quality seals could cause leakage of the product from stresses caused due to production issues and mishandling.

Reckitt Benckiser quality specialists needed to perform various tests including, compressive load tests on particular forms of flexible plastic packaging. This had to take place at manufacturing cells to control in-process verification tests.


Mecmesin supplied 4 MultiTest 2.5-xt touch screen-controlled test systems, S-beam loadcell and a specially manufactured compression probe.

Following production, a sample is placed on the test system base plate. The compression test is selected and initiated via the user-interface with just two clicks to the touch screen.

As the compression probe is lowered, it places a constant rate of force onto the centre of the sample, thereby introducing a gradual increase in pressure upon the welded seal. Reckitt Benckiser evaluates samples at two force levels, checking seal integrity at 60kgf and 100kgf.

Sample performance is observed 'live', in graphical form, on the display screen and then stored. This, in conjunction with proximity to point of manufacture, enables fast and efficient quality assessments on multiple samples in any given time frame. Reckitt Benckiser initially used the MultiTest-xt to determine benchmarks of quality, through which the company can now quickly identify 'out of tolerance' samples via colour-coded results.


  • MultiTest 2.5-xt - touch screen controlled test frame rated to 2500N
  • ILC-S 2500N
  • Special compression probe

See also

Cosmetic packaging pull-off test

A bench-top testing system was required to repeatably test the pull-off force on a variety of cosmetic containers. The system needed to allow a relatively high volume of containers to be tested with the minimum level of training required for users. Mecmesin's solution avoided the risk of damaging the loadcell by excessive torque on tightening the collet grip, and the lipstick barrel was first inserted in the grip and then connected to the gauge by a flexible chain-link.

Food packaging made from thermoformed plastics and intended for freezing, requires testing to ensure optimum functionality when closing and sealing the container. The closing effort of the lid is measured by using a motorised force tester controlled by software together with a custom-designed fixture to hold standard-sized ice cream tubs. In addition the ‘top-load’ crush strength of the container itself can also be tested on the same machine to guarantee it is rigid enough to avoid buckling and spillage when the lid is applied.

Mecmesin develops Combi Cork-i Extraction Tester for leading Scottish whisky

To improve the quality and storage of a premium product, the R&D team at a leading Scottish whisky maker needed to optimise the design of their bottle stoppers. They decided that the strength and performance of their reusable stoppers could be ensured by systematic testing of the characteristics of both portions of the stoppers. Working closely with the R&D team, Mecmesin developed the Combi Cork-i Extraction Tester, an innovative multi-function cork extraction testing system that tests both phases of de-corking synchronously.

Greek beauty product manufacturer guarantees production quality by updating to Mecmesin's digital torque testers

A manufacturer of a wide range of skin, hair-care, make-up and sun-care products based in Greece needed to replace their outdated torque testers with up-to-date digital torque testers to guarantee production quality and to ensure their products remained sealed. Mecmesin supplied the company with two Tornado 10N.m digital torque testers, which have the ability to test tamper-evident closures, an intrinsic part of their specification.

  • Jeff West
  • Product Info
  • English
  • Created 11 Oct 2016
  • Modified 11 Jun 2019
  • Hits 905