Composite packaging bags have what production process and the emergence of quality problems analysis

Composite bags of the basic preparation process is: printing, composite, slitting, bag making four steps, of which the composite and bag making two processes is the key process that affects the performance of the final product.

Composite process

Design of the product packaging process, in addition to the correct choice of various substrates, the choice of adhesives for composite is also critical, according to the use of the product, the composition, post-processing conditions, quality requirements for quality selection. If you choose the wrong adhesive, no matter how perfect the composite processing technology, will also cause poor bonding, as well as post-processing in the bonding force is low, composite is not firm, leakage, broken bags and other failures occur.

The selection of adhesives for flexible packaging for daily chemicals to consider a variety of factors, in general, as a composite adhesive should meet the following conditions:

① non-toxic;

② packaging liquid without harmful extracts appear;

③ applicable food storage temperature requirements;

④ Good weather resistance, no yellowing and blistering, no chalking and delamination;

⑤ Resistant to oil, flavour, vinegar and alcohol;

⑥No erosion of printing pattern ink and high affinity to ink.

In addition to softness, operability, adhesion durability, resistance to media erosion and health and safety should not be ignored. In terms of resistance to media erosion, the contents contain spices, alcohols, water, sugar, fatty acids, etc., its characteristics are different, it is very likely that through the inner layer of the composite film penetrated into the adhesive layer, causing corrosion and damage to the role of the bag delamination, rupture and failure. For this reason, the adhesive must have the ability to resist the erosion of the above substances, always maintain sufficient adhesive peel strength.