Testing is not everything, but not without testing. The dispenser of emulsion pump is divided into two types, namely, zap type and screw type, which can be divided into spray, foundation cream, emulsion pump, air mist valve and vacuum bottle. Lipstick tube hose quality and manufacturers have different prices on the existence of a large difference, tube body can be multi-color printing and screen printing, some manufacturers have heat transfer printing equipment and technology. Hot stamping, hot silver to the area unit price to calculate, screen printing effect is better, more expensive and less manufacturers, according to different levels of demand to choose different manufacturers. When it comes to packaging testing, try to "improve efficiency" by eliminating the longest compatibility tests, especially those that don't. Today, with the rapid development of materials science, the use of good materials can indeed help our end customers to save a lot of testing work, but only compatibility testing can not be omitted.
In a broad sense, the compatibility between cosmetic packaging and its contents refers to the mutual influence between plastic packaging and cosmetics, including chemical compatibility, physical compatibility and biological compatibility.
Chemical incompatibility: chemical components of packaging materials, chemical reactions between decomposing substances and cosmetic ingredients during processing, adverse effects on cosmetics or packaging materials; Chemical incompatibilities are manifested as changes in the appearance and smell of packaging materials or cosmetics.
Biological incompatibility: some substances in the packaging material migrate to cosmetics, resulting in adverse effects on users; It is shown that the amount of harmful substances dissolved exceeds the measurement stipulated in the cosmetics hygiene standards or norms of the countries where cosmetics are sold. In general, hazardous substances include various plastic additives, residual solvents, volatile organic compounds, hazardous metal elements, etc. Of course, not all the dissolved plastic additives will have a serious impact on the nature of cosmetics. When the dissolved ingredients are one of the cosmetic ingredients, the dissolved amount is small, and the dissolved substances are harmless to the user, this phenomenon of dissolution is normal compatibility. Colorants in the plastic precipitate into the contents, which are originally beige.
Physical incompatibility: the packaging material and the content have physical changes due to the influence of each other; Physical incompatibility phenomena are as follows: infiltration, adsorption, turtle crack, crack, dissolution, etc. In the test judgment, physical incompatibility is often misjudged as chemical incompatibility, which is because the physical incompatibility phenomenon is more obvious and the reaction is more intense.
In view of the fact that the plastic used in cosmetic packaging material itself has a certain solvent resistance, and the characteristics of the cosmetics themselves are relatively mild, the incompatibility between cosmetics and packaging material is more of a physical incompatibility.
In fact, the expression form of the results of compatibility test is quite complex. At ordinary times, many colleagues will ask, since the compatibility is not qualified, all samples should have reacted with the contents, and each sample should have problems. Why are there good or bad samples at the same temperature? In fact, there is a certain proportion of unqualified compatibility. For example, when 10 samples were tested at 40℃, only 2 samples cracked and the remaining 8 samples were intact. However, when you expand the sample size to hundreds of samples, you will find that the number of cracked samples expands to dozens. In the same way, if such packaging materials are put into mass production, the final problem will not be a small number. In addition, it is proved that the incompatibility between cosmetic packaging material and its contents is usually not in a single form.
