Common problems and effective solutions for zipper bags
Release time:2019-06-24
Among the wide variety of packaging bags, zipper bags are quite popular and convenient to use. However, although zipper bags are widely used in many industries on the market, it is not easy to produce qualified and standard zipper bags during the production process.
In the entire zipper bag processing process, there are still many problems, big and small. If you are not careful, uneven heat sealing, delamination, and dead creases will often occur. These are the difficulties encountered by many companies when customizing zipper bags.
Today, Shunxingyuan Packaging, a professional flexible packaging manufacturer, summarizes the problems and their causes that are prone to occur during the production of zipper bags:
1. The part where the zipper is sealed with the bag body is uneven during bag making;
2. Partial delamination occurs at the part where the zipper is sealed with the bag body during bag making;
3. "Dead creases" appear at the part where the two ends of the zipper intersect with the edge seal of the bag during bag making;
4. Partial delamination occurs at the part where the two ends of the zipper intersect with the edge seal of the bag during bag making;
Shunxingyuan Packaging, a professional flexible packaging manufacturer, has observed many zipper bags with defects and found that the above problems are related to the following matters:
1. The thermal shrinkage rate of the zipper itself is greater than that of the composite film;
2. The melting point of the zipper itself is greater than or equal to the melting point of the heat-sealing layer film;
3. The cross-section of the zipper's fastener is too large;
4. The design of the local heat-sealing bar on the zipper bag making machine is unreasonable. It is recommended to use an ultrasonic heat-sealing device;
5. The design of the local heat-sealing pressure head is unreasonable (too small);
6. Insufficient ultrasonic heat-sealing device output power or pressure;
7. Insufficient heat resistance of the ink layer.
Therefore, in order to customize qualified and standard zipper bags, the packaging factory must pay attention to the above seven matters during bag making. Only by strictly controlling the above matters during the zipper bag processing process can high-quality zipper bags be produced.
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