How to choose packaging composite adhesive? It doesn’t start with “stickiness”, but with these three conditions

The selection of hot melt adhesive in packaging composite scenarios should not only be based on whether it can stick or not. The substrate combination, adhesive application method, and subsequent flow conditions determine whether the solution is suitable for the actual production line. This article provides a judgment framework that is easy for procurement and process personnel to use together.

Core Keywords
Packaging composite adhesive, packaging hot melt adhesive, EVA hot melt adhesive, packaging material bonding, hot melt adhesive selection

Can this glue stick? “Is the most common question in packaging processing, but it is usually not specific enough.

If the substrate is paper to paper, the judgment logic is different from that of paper to laminating material; If rubber rollers are used for glue application, the requirements for point like glue application are also different; If the finished product needs to undergo stacking, transportation, or temperature changes, the testing method cannot only focus on the pressing moment.

For the selection of packaging composite adhesive, it is recommended to first clarify the following three conditions.

After confirming the three conditions, it will be more effective to arrange sample testing. Testing should not be limited to just one sample, but should cover the appearance after continuous gluing and pressing under normal production cycle, as well as the edges and stress positions after placement.

Purchasing personnel can also ask more specific questions. For example, instead of asking ‘Do you have any packaging adhesive?’, explain ‘What materials need to be bonded, what equipment will be used, and what are the current concerns?’. This way, the suggestions provided by the supplier are more likely to be implemented on site, rather than being limited to the product name.

Sunlife can assist in sorting out the selection direction of hot melt adhesive based on packaging material combinations and adhesive application processes, and provide sample testing support; After the scheme is stable, it can also be coordinated with technical communication during continuous supply and process adjustment.

FAQ

Q: Can packaging composite adhesive be screened by price first?
A: Prices can be compared, but compatibility should be confirmed first. If losses are caused due to glue cracking, appearance issues, or rework, the difference in unit price may not necessarily represent the actual cost difference.

Q: Why do we need to explain the subsequent transportation conditions?
A: After being stacked, compressed, or subjected to environmental changes, the bonding area of the packaged product may face different stress states from the current state of the sample.

Q: Does sample testing only require the participation of the procurement department?
A: It is recommended that procurement, process, and frontline operators participate together in order to simultaneously assess supply, equipment adaptability, and finished product requirements.