1. Add waterproofing agent:
Under normal circumstances, the manufacturer's moisture-proof treatment of the carton is to coat a layer of waterproofing agent on the outside of the carton, which is simple and low-cost.
It can bring a good moisture-proof effect to the carton, and can be divided into temporary waterproofing and long-term waterproofing according to the needs, which should be selected according to the needs.
2. Use the lamination process:
Lamination is a commonly used waterproof treatment process for printed products such as carton face paper, cartons, handbags, and covers.
It can achieve the properties of waterproof, anti-fouling, anti-fading, heat resistance, light resistance, conflict resistance, etc. The treatment can bring superior waterproof performance to the carton,
It can also enhance the gloss, tear-off strength and tensile strength of the carton, improving the service life and packaging quality of the packaging carton.
3. Add high polymer:
At present, in the production process of corrugated boxes, an appropriate amount of high molecular polymer (also known as cross-linking agent or bridging agent) is added to the starch adhesive.
The high molecular polymer will replace the hydroxyl group in the starch molecule, so that the corrugated paste line has a better waterproof and moisture-proof effect.
When the carton enters a cold storage or humid environment, it can prevent the carton from collapsing due to moisture absorption and emulsification of the corrugated paste line.
4. To avoid moisture of raw materials:
If the carton raw materials are already damp during the production process, it will have a great impact on the packaging cartons produced by subsequent processing.
Therefore, most carton factories will isolate the base paper warehouse from the outdoors as much as possible, and install dehumidifiers in the warehouse to ensure that the relative temperature is below 65% to ensure the quality of the base paper.
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