First, observe the tightness of the seal. If there is a small joint in the
seal, the product is considered unqualified.
Secondly, visually inspect the surface of the vacuum packaging bag for
composite food for scratches and pinholes. Focus on checking whether the seals
are contaminated. It cannot be determined immediately by visual inspection, and
slight negligence is the cause of erosion in the future. Check the seal, spray
the surface active agent with dye on the seal, see if it passes, and determine
the adhesion of the seal.
Then comes the seal strength test. Check the sealing of the composite
vacuum packaging bag and cut it into 15mm wide strips. Use a material tester to
measure the strength of the seal at a rate of 300 ± 20mm/min. Generally, the
sealing strength of the composite bag shall reach 2334N./15mm.
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