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Direct answer: It is recommended to choose multi-layer paper bags with high initial adhesion, medium to short opening time, and good folding resistance for sealingHot melt adhesive granulesThe softening point is above 90 ℃, commonly known as EVA high viscosity or APAO type. The difficulty of multi-layer paper bags lies in the multiple layers of bag openings, the paper often having coatings or moisture-proof films, and the adhesive needs to quickly bite and withstand repeated bending during transportation.
Chemical raw materials, grain feed, and building materials powder are commonly packaged in two to four layer kraft paper bags, with a single bag weight of 25-50 kilograms. Once the sealing of such packaging fails, the loss is not only the bag, but also the spilled materials and on-site cleaning costs. The biggest difference between it and cardboard box sealing is that the force is continuous, the bag body deforms with the flow of materials, and the sealing needs to be repeatedly bent during transportation.
| parameter | Suggested scope | Why is it important |
|---|---|---|
| softening point | Above 90 ℃ | Summer warehouse stacking temperature is high to prevent creep and slippage |
| Initial tack | high | The bag has multiple layers and significant rebound, requiring immediate grasping |
| Opening hours | 2-6 seconds | Too long will flow before pressing, too short will not fit in time |
| Folding resistance | Repeated bending at room temperature without brittle cracking | The seal is continuously folded during the handling and stacking process |
| Melt viscosity | moderate | Too thin penetration too fast, too thick coating uneven |
| low-temperature resistance | Depending on the storage environment | Cold storage or northern winter models that require low temperature and non brittleness |
Guangzhou Sunlife Trading provides Sunlife hot melt adhesive for multi-layer paper bag customers, with a focus on high initial adhesion and folding resistance balance: it can bite the rebounding bag opening within two to three seconds without slipping due to creep during long-term stacking. Specific models will be recommended based on bag type, filling weight, and storage environment during supply, and samples can be sent to the customer’s site for on-site verification.
Light load and short distance are acceptable, but for heavy bags and long-term stacking, it is recommended to use specialized models with higher softening points and better folding resistance. Ordinary sealing glue is prone to slip during summer stacking.
The explanation is interface damage, usually related to dust, coating or insufficient compression. First investigate these three items, and then consider replacing the adhesive.
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