What kind of hot melt adhesive particles are used for self-adhesive sealing of express envelopes? Selection and Common Problems

Answer directly

The cover of the express envelope is self-adhesive, and it is recommended to use one that has fast initial adhesion, good adhesion to PE and paperHot melt adhesive granulesApply a strip-shaped adhesive line, and the sealing can be controlled by sticking or tearing. The key lies in the opening time and the balance of adhesion.

Three key points for selection

• Initial adhesion speed:The sealing line speed is fast and requires a second level initial adhesion model.
• Substrate matching:The envelopes are mostly made of PE coated paper, and the adhesive should have adhesion to the PE.
• Temperature resistance:The carriage does not flow under high temperature in summer and does not crack during winter.

Sunlifehot melt adhesiveThere are special granules for envelope sealing, and Guangzhou Sunlife Trading can match the glue according to the sealing machine speed to reduce leakage and overflow.

Frequently Asked Questions

Q: Why are some envelopes not sealed securely?It is often due to insufficient adhesive or low temperature, resulting in insufficient initial adhesion.

Q: Can I tear off the sticker repeatedly?The disposable sealing design is not recommended to be repeated. If it needs to be removable, a removable formula should be selected.

Q: How can the glue line be laid more efficiently?Apply with fine toothed rollers, which not only saves glue but also ensures uniformity.