The open time of the hot melt adhesive refers to the time interval during which the adhesive will not lose its ability to infiltrate the bonded object due to solidification or crystallization after sizing. The open time is usually measured in seconds. The most direct effect on the opening time is the amount of wax in the hot melt adhesive. The usual rule is that more wax will shorten the opening time. Different uses have different requirements for the opening time.
For example, handicrafts generally require manual operation and adjustment, and the corresponding opening time should be longer to facilitate operation and adjustment; another example is high-speed cardboard bonding, which often uses automated equipment and assembly lines. For type production, the opening time of the corresponding hot melt adhesive should be shorter.