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The common food packaging quality problems and solutions (3-5)

Jan 04,2022

Source:Link Testing Instruments Co.,Ltd.

What should we do if there is a peculiar smell in the plastic packaging during use?

Quality issues:

Before using some plastic packaging bags, the packaging itself has a pungent peculiar smell, and even the packaged food has a similar peculiar smell.

Cause Analysis:

--Packaging material

• Improper control of the printing process-the organic solvents (alcohols, ketones, esters, benzene and other solvents) that dissolve the printing inks are not sufficiently volatilized. The solvent residue test can be used to test the total amount of residual solvents and verify whether they contain harmful Benzene substances;

• Improper control of the compounding process-As a result, when the packaging compound film used is compounded with an adhesive, the organic solvent that dissolves the adhesive is not sufficiently volatilized;

• Poor quality of raw materials-the resin raw materials used to produce the packaging materials themselves or the small molecules with peculiar smells added to them contain more;

• Adhesives are of poor quality-the adhesives used to laminate each layer of film produce harmful substances such as toluene diamine at high temperatures.

Expert advice:

——Pay attention to the monitoring of sanitary performance indicators such as solvent residues, evaporation residues, toluene diamine content, and potassium permanganate consumption in packaging.

——Choose suitable inks (such as solvent-free inks) and adhesives, and adjust the volatilization and drying process parameters during printing and compounding.

Auto Tensile Tester LTS-05

What properties should be paid attention to when the packaging materials of sauced meat products enter the factory?

(1) Barrier

• The barrier ability to oxygen in the environment-verified by oxygen permeability test, if the oxygen permeability of the packaging material is large (ie poor barrier), it is easy to cause the protein, fat and other ingredients in the stewed meat products to be oxidized, causing Bacteria multiply, and quality problems such as mildew and bag swelling appear.

• Rubbing resistance-verify by comparing the permeation of the same gas before and after rubbing, such as the oxygen permeation before and after rubbing. Prevent the packaging material from reducing the barrier properties of the packaging and even leaking due to its poor resistance to rubbing. The rubbing resistance is mainly for the composite film packaging of aluminum-containing materials (for example, containing aluminum-plated film, aluminum foil, etc.).

(2) Physical and mechanical properties

• Thickness uniformity—verified by testing the packaging thickness, the uniformity of thickness is the basis for ensuring good packaging material performance.

• Flexibility-through the joint verification of tensile and elongation, elastic modulus, and pendulum impact energy tests, to prevent the packaging material from not fitting and easy to break when vacuuming due to the brittleness of the packaging material .

• Slippery property—verified by the friction coefficient test to prevent the packaging material from being difficult to unwind or slip due to the friction coefficient being too large or too small.

• High temperature resistance performance-verified by the retort resistance test to prevent the packaging material from causing problems such as delamination, shrinkage, and bag breakage after retorting and sterilizing due to poor heat resistance of the packaging material.

(3) Hygienic performance

• Organic solvent residues—verified by solvent residue tests. If the solvent residues are too much, the packaging film will have peculiar smell, and the residual solvent will easily migrate to the stewed meat products, which will cause peculiar smells and affect the health of consumers.

Coefficient of Friction Tester LTCOF-05A

What properties should be paid attention to in the packaging of finished milk powder?

① The sealing strength of the heat seal—verify through the heat seal strength test. If the heat seal strength is improper, problems such as air leakage and bag breakage are likely to occur.

② Tightness-through the sealing performance (negative pressure method) test to verify, you can find out the parts of the finished package that are prone to air leakage and leakage.

③ Resistance to content impact—verified by burst pressure test. Fill the package with gas to test whether the finished product package breaks under the pressure impact of the internal gas, which is used to find the location where the package is prone to rupture and the pressure strength.

④ The gas composition inside the package is verified by the headspace gas analysis test, which can monitor the proportion of oxygen, carbon dioxide, and nitrogen in the finished product package, so as to determine the tightness of the finished product package and ensure that the internal gas proportion meets the quality of the milk powder need.

⑤ Pressure resistance performance-to further verify whether the finished package is broken during the stacking process or squeezed by external force through related tests of pressure resistance performance.

⑥ Drop resistance performance-to further verify whether the bag breaks when the finished product package falls within a certain height through the related drop resistance test.

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