The length of the sealer tape can be realized by adjusting the regulating wheel on the machine and controlling the temperature. The specific steps are as follows: 

　　1. Adjust the adjusting wheel: the adjusting wheel is usually located on the tape device of the sealing machine, and the length of the tape can be changed by rotating the adjusting wheel. If the tape is too short, you can rotate the adjusting wheel clockwise; if the tape is too long, you can rotate the adjusting wheel counterclockwise. 

　　2. Control the temperature: The tape of the sealer is usually softened by heating with a heater, so the length of the tape can be adjusted by controlling the temperature. If the tape is too short, the temperature can be increased; if the tape is too long, the temperature can be decreased.

　　 It should be noted that the adjustment of the regulating wheel and the control temperature need to be made according to the actual situation, and should not be over-adjusted, so as not to affect the sealing effect and the service life of the tape. In addition, when using the sealing machine, you also need to pay attention to keep the machine clean and use it correctly to ensure the sealing quality and efficiency.