How to solve the troubleshooting of packaging hot melt adhesive?

There may be various reasons for production downtime when using hot melt adhesive, such as nozzle drawing, bonding failure, or lack of adhesive at the coating head. To avoid this situation, even the simplest applications must be set up correctly to ensure that the production line can run efficiently and cleanly, which is important.

It is important to record the current settings and make any changes at once before making any changes, and to record and observe the changes. Always wear the correct PPE (personal protective equipment) and have it replaced by capable personnel.

Bond Failure

There may be several reasons for adhesive failure in production, such as changes in the substrate, environmental factors, or incorrect compression, as shown in three examples. In addition, adhesive failure upon leaving the machine may be due to:

The opening time of the adhesive cannot be set correctly for too short or too long – using too much adhesive
may cause the adhesive to maintain its temperature and prolong its opening time

Poor compression or alignment

Possible solutions to address this adhesive issue are:

Adjust the application temperature of adhesive

Reduce application pressure and potential glue temperature

Check the production line settings and adhesive positions

Lack of adhesive at the coating head

There are multiple reasons for this issue, such as:

Blockage caused by carbon buildup and/or nozzle contamination in the hose

Slow melting rate due to incorrect temperature or heating element malfunction in the glue box

The machine may have insufficient melting capacity, which may lead to excessive demand for mechanical parts

To solve this problem, you can:

Verify the thermal stability of the adhesive and the condition of the application machine

  Use auxiliary probes or thermostats to check the temperature of the tank

Upgrade to a machine with a larger capacity

Thread

One of the most common problems with packaging hot melt adhesive on the production line is wire drawing. This situation occurs when some adhesive remains on the nozzle and is pulled offline. There may be several reasons for this:

Due to incorrect temperature settings, improper long-term mechanical maintenance, or external contamination, the adhesive may degrade

The application nozzle is too far away from the substrate

Excessive air flow around the machine

Application temperature too low

This can be avoided in the following ways:

Regular cleaning of hot melt adhesive cans and good housekeeping practices

Protect the production line from airflow

Impact – Increasing adhesive temperature during production operation

There is excessive smoke/burning odor

If you see too much smoke or smell the smell of burning, there may be several reasons that can cause this situation to occur:

The temperature setting may be incorrect

The heater may have a malfunction

The lid may be open

In these cases, the following actions may need to be taken:

Reduce temperature

Check internal management

Check the settings according to the manufacturer’s instructions and adhesive data sheet