Why does the sauce packaging bag fade? Why does the bag break?

- Nov 30, 2020-

The patterns on the sauce and sauce product packaging bags will always darken and fade, and it is easy to compound delamination and packaging bags. How do these problems arise? How to solve these problems?


Reasons for the fading of sauce and sauce product packaging bags

There are two main reasons for the darkening and fading of the pattern of the sauce and sauce product packaging bags: the ink color of the pattern is darkened by the sauce color or the printing ink on the packaging mask is eroded by the salt and spicy substances of the sauce and sauce products. Fading; secondly, the reason for the delamination of the composite film of the composite packaging bag for sauce and sauce products is mostly due to the poor leakage resistance of the inner film of the package, and the oil and salt etc. penetrate the inner film to corrode the adhesive.

_20201130085509

Why does the bag break? How to avoid broken bags?

If the plastic composite packaging of sauce and sauce products breaks, most of the products are stuck on the seal of the packaging bag without heat sealing. Therefore, special attention should be paid to the plastic composite packaging of sauce and sauce products:


1. If the background color of the sauce and sauce product packaging cannot cover the color of the sauce and sauce product, the color of the packaging pattern will become darker. Therefore, when designing packaging patterns, estimate the color of the contents, and deepen the background color or increase the hiding power, and try to prevent the color of the sauce and sauce products from passing through or less passing through the background color of the pattern.


2. The composite inner film of the sauce and sauce products should use a film with strong oil resistance, gas resistance and salt resistance. Do not use a single-component adhesive compound that does not solidify the gel film to prevent the sauce and sauce products from being oily. Quality, salt and spicy substances penetrate the inner film and the composite film, so that the ink printed in the packaging mask will not be corroded, and of course the color of the pattern of the sauce and sauce product packaging will not fade due to erosion.


3. For the packaging of sauce and sauce products, in addition to the selection of an inner film with strong anti-leakage properties, a two-component polyurethane adhesive should also be used for compounding. Appropriately increase the amount of glue and extend the curing time of the composite film, so that the oil, salt and spicy substances in the sauce and sauce products are difficult to penetrate the inner membrane. The cured composite adhesive layer will re-stick or penetrate the adhesive film to corrode the ink layer. This will greatly reduce the occurrence of composite packaging film delamination caused by composite adhesive and deinking.


4. Improve the tools for filling sauce and sauce products to avoid contaminating the sealing part of the packaging bag, which can reduce the failure of heat-sealing the packaging opening and reduce the damage rate of the packaging bag.